dynlink.c 140.9 KB
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#define _GNU_SOURCE
#define SYSCALL_NO_TLS 1
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#include "dynlink.h"

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#include <stdbool.h>
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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <elf.h>
#include <sys/mman.h>
#include <limits.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <link.h>
#include <setjmp.h>
#include <pthread.h>
#include <ctype.h>
#include <dlfcn.h>
#include <semaphore.h>
#include <sys/membarrier.h>
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#include <sys/time.h>
#include <time.h>
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#include "dlfcn_ext.h"
#include "dynlink_rand.h"
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#include "ld_log.h"
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#include "libc.h"
#include "malloc_impl.h"
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#include "namespace.h"
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#include "ns_config.h"
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#include "pthread_impl.h"
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#include "strops.h"
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#ifdef OHOS_ENABLE_PARAMETER
#include "sys_param.h"
#endif
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#include "zip_archive.h"
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static void error(const char *, ...);

#define MAXP2(a,b) (-(-(a)&-(b)))
#define ALIGN(x,y) ((x)+(y)-1 & -(y))
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#define GNU_HASH_FILTER(ght, ghm, gho)                \
	const size_t *bloomwords = (const void *)(ght+4); \
	size_t f = bloomwords[gho & (ght[2]-1)];          \
	if (!(f & ghm)) continue;                         \
	f >>= (gh >> ght[3]) % (8 * sizeof f);            \
	if (!(f & 1)) continue;
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#define container_of(p,t,m) ((t*)((char *)(p)-offsetof(t,m)))
#define countof(a) ((sizeof (a))/(sizeof (a)[0]))
#define DSO_FLAGS_NODELETE 0x1

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#ifdef HANDLE_RANDOMIZATION
#define NEXT_DYNAMIC_INDEX 2
#define MIN_DEPS_COUNT 2
#define NAME_INDEX_ZERO 0
#define NAME_INDEX_ONE 1
#define NAME_INDEX_TWO 2
#define NAME_INDEX_THREE 3
#define TLS_CNT_INCREASE 3
#define INVALID_FD_INHIBIT_FURTHER_SEARCH (-2)
#endif

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#define PARENTS_BASE_CAPACITY 8
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#define RELOC_CAN_SEARCH_DSO_BASE_CAPACITY 32
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struct debug {
	int ver;
	void *head;
	void (*bp)(void);
	int state;
	void *base;
};

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struct reserved_address_params {
	void* start_addr;
	size_t reserved_size;
	bool must_use_reserved;
	bool reserved_address_recursive;
#ifdef LOAD_ORDER_RANDOMIZATION
	struct dso *target;
#endif
};

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struct td_index {
	size_t args[2];
	struct td_index *next;
};

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struct verinfo {
	const char *s;
	const char *v;
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	bool use_vna_hash;
	uint32_t vna_hash;
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};

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struct sym_info_pair {
	uint_fast32_t sym_h;
	uint32_t sym_l;
};

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struct dso {
#if DL_FDPIC
	struct fdpic_loadmap *loadmap;
#else
	unsigned char *base;
#endif
	char *name;
	size_t *dynv;
	struct dso *next, *prev;
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	/* add namespace */
	ns_t *namespace;
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	/* mark the dso status */
	unsigned int flags;

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	int cache_sym_index;
	struct dso *cache_dso;
	Sym *cache_sym;

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	Phdr *phdr;
	int phnum;
	size_t phentsize;
	Sym *syms;
	Elf_Symndx *hashtab;
	uint32_t *ghashtab;
	int16_t *versym;
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	Verdef *verdef;
	Verneed *verneed;
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	char *strings;
	struct dso *syms_next, *lazy_next;
	size_t *lazy, lazy_cnt;
	unsigned char *map;
	size_t map_len;
	dev_t dev;
	ino_t ino;
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	uint64_t file_offset;
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	char relocated;
	char constructed;
	char kernel_mapped;
	char mark;
	char bfs_built;
	char runtime_loaded;
	char by_dlopen;
	struct dso **deps, *needed_by;
	size_t ndeps_direct;
	size_t next_dep;
	int ctor_visitor;
	int nr_dlopen;
	char *rpath_orig, *rpath;
	struct tls_module tls;
	size_t tls_id;
	size_t relro_start, relro_end;
	uintptr_t *new_dtv;
	unsigned char *new_tls;
	struct td_index *td_index;
	struct dso *fini_next;
	char *shortname;
#if DL_FDPIC
	unsigned char *base;
#else
	struct fdpic_loadmap *loadmap;
#endif
	struct funcdesc {
		void *addr;
		size_t *got;
	} *funcdescs;
	size_t *got;
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	struct dso **parents;
	size_t parents_count;
	size_t parents_capacity;
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	bool is_global;
	bool is_reloc_head_so_dep;
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	struct dso **reloc_can_search_dso_list;
	size_t reloc_can_search_dso_count;
	size_t reloc_can_search_dso_capacity;
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	char buf[];
};

struct symdef {
	Sym *sym;
	struct dso *dso;
};

typedef void (*stage3_func)(size_t *, size_t *);

static struct builtin_tls {
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	char c[8];
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	struct pthread pt;
	void *space[16];
} builtin_tls[1];
#define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)

#define ADDEND_LIMIT 4096
static size_t *saved_addends, *apply_addends_to;
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static bool g_is_asan;
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static struct dso ldso;
static struct dso *head, *tail, *fini_head, *syms_tail, *lazy_head;
static char *env_path, *sys_path;
static unsigned long long gencnt;
static int runtime;
static int ldd_mode;
static int ldso_fail;
static int noload;
static int shutting_down;
static jmp_buf *rtld_fail;
static pthread_rwlock_t lock;
static struct debug debug;
static struct tls_module *tls_tail;
static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN;
static size_t static_tls_cnt;
static pthread_mutex_t init_fini_lock;
static pthread_cond_t ctor_cond;
static struct dso *builtin_deps[2];
static struct dso *const no_deps[1];
static struct dso *builtin_ctor_queue[4];
static struct dso **main_ctor_queue;
static struct fdpic_loadmap *app_loadmap;
static struct fdpic_dummy_loadmap app_dummy_loadmap;

struct debug *_dl_debug_addr = &debug;

extern hidden int __malloc_replaced;

hidden void (*const __init_array_start)(void)=0, (*const __fini_array_start)(void)=0;

extern hidden void (*const __init_array_end)(void), (*const __fini_array_end)(void);

weak_alias(__init_array_start, __init_array_end);
weak_alias(__fini_array_start, __fini_array_end);
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#ifdef DFX_SIGNAL_LIBC
static void __InstallSignalHandler()
{
}
weak_alias(__InstallSignalHandler, DFX_InstallSignalHandler);
#endif
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#ifdef HANDLE_RANDOMIZATION
static int do_dlclose(struct dso *p);
#endif

#ifdef LOAD_ORDER_RANDOMIZATION
static bool map_library_header(struct loadtask *task);
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static bool task_map_library(struct loadtask *task, struct reserved_address_params *reserved_params);
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static bool load_library_header(struct loadtask *task);
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static void task_load_library(struct loadtask *task, struct reserved_address_params *reserved_params);
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static void preload_direct_deps(struct dso *p, ns_t *namespace, struct loadtasks *tasks);
static void unmap_preloaded_sections(struct loadtasks *tasks);
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static void preload_deps(struct dso *p, struct loadtasks *tasks);
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static void run_loadtasks(struct loadtasks *tasks, struct reserved_address_params *reserved_params);
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static void assign_tls(struct dso *p);
static void load_preload(char *s, ns_t *ns, struct loadtasks *tasks);
#endif

/* Sharing relro */
static void handle_relro_sharing(struct dso *p, const dl_extinfo *extinfo, ssize_t *relro_fd_offset);

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/* asan path open */
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int handle_asan_path_open(int fd, const char *name, ns_t *namespace, char *buf, size_t buf_size);
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/* add namespace function */
static void *addr2dso(size_t a);
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static void get_sys_path(ns_configor *conf);
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static void dlclose_ns(struct dso *p);
static bool get_app_path(char *path, size_t size)
{
	int l = 0;
	l = readlink("/proc/self/exe", path, size);
	if (l < 0 || l >= size) {
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		LD_LOGD("get_app_path readlink failed!");
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		return false;
	}
	path[l] = 0;
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	LD_LOGD("get_app_path path:%{public}s.", path);
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	return true;
}

static void init_default_namespace(struct dso *app)
{
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	ns_t *default_ns = get_default_ns();
	memset(default_ns, 0, sizeof *default_ns);
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	ns_set_name(default_ns, NS_DEFAULT_NAME);
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	if (env_path) ns_set_env_paths(default_ns, env_path);
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	ns_set_lib_paths(default_ns, sys_path);
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	ns_set_separated(default_ns, false);
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	app->namespace = default_ns;
	ns_add_dso(default_ns, app);
	LD_LOGD("init_default_namespace default_namespace:"
			"nsname: default ,"
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			"lib_paths:%{public}s ,"
			"env_path:%{public}s ,"
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			"separated: false.",
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			sys_path, env_path);
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	return;
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}

static void set_ns_attrs(ns_t *ns, ns_configor *conf)
{
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	if(!ns || !conf) {
		return;
	}

	char *lib_paths, *asan_lib_paths, *permitted_paths, *asan_permitted_paths, *allowed_libs;
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	ns_set_separated(ns, conf->get_separated(ns->ns_name));

	lib_paths = conf->get_lib_paths(ns->ns_name);
	if (lib_paths) ns_set_lib_paths(ns, lib_paths);

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	asan_lib_paths = conf->get_asan_lib_paths(ns->ns_name);
	if (asan_lib_paths) ns_set_asan_lib_paths(ns, asan_lib_paths);

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	permitted_paths = conf->get_permitted_paths(ns->ns_name);
	if (permitted_paths) ns_set_permitted_paths(ns, permitted_paths);

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	asan_permitted_paths = conf->get_asan_permitted_paths(ns->ns_name);
	if (asan_permitted_paths) ns_set_asan_permitted_paths(ns, asan_permitted_paths);

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	allowed_libs = conf->get_allowed_libs(ns->ns_name);
	if (allowed_libs) ns_set_allowed_libs(ns, allowed_libs);
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	LD_LOGD("set_ns_attrs :"
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			"ns_name: %{public}s ,"
			"separated:%{public}d ,"
			"lib_paths:%{public}s ,"
			"asan_lib_paths:%{public}s ,"
			"permitted_paths:%{public}s ,"
			"asan_permitted_paths:%{public}s ,"
			"allowed_libs: %{public}s .",
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			ns->ns_name, ns->separated, ns->lib_paths, ns->asan_lib_paths, permitted_paths,
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			asan_permitted_paths, allowed_libs);
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}

static void set_ns_inherits(ns_t *ns, ns_configor *conf)
{
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	if(!ns || !conf) {
		return;
	}

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	strlist *inherits = conf->get_inherits(ns->ns_name);
	if (inherits) {
		for (size_t i=0; i<inherits->num; i++) {
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			ns_t *inherited_ns = find_ns_by_name(inherits->strs[i]);
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			if (inherited_ns) {
				char *shared_libs = conf->get_inherit_shared_libs(ns->ns_name, inherited_ns->ns_name);
				ns_add_inherit(ns, inherited_ns, shared_libs);
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				LD_LOGD("set_ns_inherits :"
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						"ns_name: %{public}s ,"
						"separated:%{public}d ,"
						"lib_paths:%{public}s ,"
						"asan_lib_paths:%{public}s ,",
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						inherited_ns->ns_name, inherited_ns->separated, inherited_ns->lib_paths,
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						inherited_ns->asan_lib_paths);
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			}
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		}
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		strlist_free(inherits);
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	} else {
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		LD_LOGD("set_ns_inherits inherits is NULL!");
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	}
}

static void init_namespace(struct dso *app)
{
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	char app_path[PATH_MAX+1];
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	if (!get_app_path(app_path, sizeof app_path)) {
		strcpy(app_path, app->name);
	}
	char *t = strrchr(app_path, '/');
	if (t) {
		*t = 0;
	} else {
		app_path[0] = '.';
		app_path[1] = 0;
	}
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	nslist *nsl = nslist_init();
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	ns_configor *conf = configor_init();
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	char file_path[sizeof "/etc/ld-musl-namespace-" + sizeof (LDSO_ARCH) + sizeof ".ini" + 1] = {0};
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	(void)snprintf(file_path, sizeof file_path, "/etc/ld-musl-namespace-%s.ini", LDSO_ARCH);
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	LD_LOGI("init_namespace file_path:%{public}s", file_path);
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	int ret = conf->parse(file_path, app_path);
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	if (ret < 0) {
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		LD_LOGE("init_namespace ini file parse failed!");
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		/* Init_default_namespace is required even if the ini file parsing fails */
		if (!sys_path) get_sys_path(conf);
		init_default_namespace(app);
		configor_free();
		return;
	}

	/* sys_path needs to be parsed through ini file */
	if (!sys_path) get_sys_path(conf);
	init_default_namespace(app);

	/* Init default namespace */
	ns_t *d_ns = get_default_ns();
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	set_ns_attrs(d_ns, conf);
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	/* Init other namespace */
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	if (!nsl) {
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		LD_LOGE("init nslist fail!");
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		configor_free();
		return;
	}
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	strlist *s_ns = conf->get_namespaces();
	if (s_ns) {
		for (size_t i=0; i<s_ns->num; i++) {
			ns_t *ns = ns_alloc();
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			ns_set_name(ns, s_ns->strs[i]);
			set_ns_attrs(ns, conf);
			ns_add_dso(ns, app);
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			nslist_add_ns(ns);
		}
		strlist_free(s_ns);
	} 
	/* Set inherited namespace */
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	set_ns_inherits(d_ns, conf);
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	for (size_t i = 0; i < nsl->num; i++) {
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		set_ns_inherits(nsl->nss[i], conf);
	}
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	configor_free();
	return;
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}

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/* Compute load address for a virtual address in a given dso. */
#if DL_FDPIC
static void *laddr(const struct dso *p, size_t v)
{
	size_t j=0;
	if (!p->loadmap) return p->base + v;
	for (j=0; v-p->loadmap->segs[j].p_vaddr >= p->loadmap->segs[j].p_memsz; j++);
	return (void *)(v - p->loadmap->segs[j].p_vaddr + p->loadmap->segs[j].addr);
}
static void *laddr_pg(const struct dso *p, size_t v)
{
	size_t j=0;
	size_t pgsz = PAGE_SIZE;
	if (!p->loadmap) return p->base + v;
	for (j=0; ; j++) {
		size_t a = p->loadmap->segs[j].p_vaddr;
		size_t b = a + p->loadmap->segs[j].p_memsz;
		a &= -pgsz;
		b += pgsz-1;
		b &= -pgsz;
		if (v-a<b-a) break;
	}
	return (void *)(v - p->loadmap->segs[j].p_vaddr + p->loadmap->segs[j].addr);
}
static void (*fdbarrier(void *p))()
{
	void (*fd)();
	__asm__("" : "=r"(fd) : "0"(p));
	return fd;
}
#define fpaddr(p, v) fdbarrier((&(struct funcdesc){ \
	laddr(p, v), (p)->got }))
#else
#define laddr(p, v) (void *)((p)->base + (v))
#define laddr_pg(p, v) laddr(p, v)
#define fpaddr(p, v) ((void (*)())laddr(p, v))
#endif

static void decode_vec(size_t *v, size_t *a, size_t cnt)
{
	size_t i;
	for (i=0; i<cnt; i++) a[i] = 0;
	for (; v[0]; v+=2) if (v[0]-1<cnt-1) {
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		if (v[0] < 8*sizeof(long)) {
			a[0] |= 1UL<<v[0];
		}
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		a[v[0]] = v[1];
	}
}

static int search_vec(size_t *v, size_t *r, size_t key)
{
	for (; v[0]!=key; v+=2)
		if (!v[0]) return 0;
	*r = v[1];
	return 1;
}

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static int check_vna_hash(Verdef *def, int16_t vsym, uint32_t vna_hash)
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{
	int matched = 0;

	vsym &= 0x7fff;
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	Verdef *verdef = def;
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	for(;;) {
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		if ((verdef->vd_ndx & 0x7fff) == vsym) {
			if (vna_hash == verdef->vd_hash) {
				matched = 1;
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			}
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			break;
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		}
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		if (matched) {
			break;
		}
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		if (verdef->vd_next == 0) {
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			break;
		}
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		verdef = (Verdef *)((char *)verdef + verdef->vd_next);
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	}
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#if (LD_LOG_LEVEL & LD_LOG_DEBUG)
	if (!matched) {
		LD_LOGD("check_vna_hash no matched found. vsym=%{public}d vna_hash=%{public}x", vsym, vna_hash);
	}
#endif
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	return matched;
}

static int check_verinfo(Verdef *def, int16_t *versym, uint32_t index, struct verinfo *verinfo, char *strings)
{
	/* if the versym and verinfo is null , then not need version. */
520
	if (!versym || !def) {
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		if (strlen(verinfo->v) == 0) {
			return 1;
		} else {
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			LD_LOGD("check_verinfo versym or def is null and verinfo->v exist, s:%{public}s v:%{public}s.",
				verinfo->s, verinfo->v);
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			return 0;
		}
	}

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	int16_t vsym = versym[index];
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	/* find the verneed symbol. */
	if (verinfo->use_vna_hash) {
		if (vsym != VER_NDX_LOCAL && versym != VER_NDX_GLOBAL) {
			return check_vna_hash(def, vsym, verinfo->vna_hash);
		}
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	}

	/* if the version length is zero and vsym not less than zero, then library hava default version symbol. */
	if (strlen(verinfo->v) == 0) {
		if (vsym >= 0) {
			return 1;
		} else {
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			LD_LOGD("check_verinfo not default version. vsym:%{public}d s:%{public}s", vsym, verinfo->s);
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			return 0;
		}
	}

	/* find the version of symbol. */
	vsym &= 0x7fff;
	for (;;) {
		if (!(def->vd_flags & VER_FLG_BASE) && (def->vd_ndx & 0x7fff) == vsym) {
			break;
		}
		if (def->vd_next == 0) {
			return 0;
		}
		def = (Verdef *)((char *)def + def->vd_next);
	}

	Verdaux *aux = (Verdaux *)((char *)def + def->vd_aux);

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	int ret = !strcmp(verinfo->v, strings + aux->vda_name);
#if (LD_LOG_LEVEL & LD_LOG_DEBUG)
	if (!ret) {
		LD_LOGD("check_verinfo version not match. s=%{public}s v=%{public}s vsym=%{public}d vda_name=%{public}s",
			verinfo->s, verinfo->v, vsym, strings + aux->vda_name);
	}
#endif
	return ret;
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}

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static struct sym_info_pair sysv_hash(const char *s0)
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{
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	struct sym_info_pair s_info_p;
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	const unsigned char *s = (void *)s0;
	uint_fast32_t h = 0;
	while (*s) {
		h = 16*h + *s++;
		h ^= h>>24 & 0xf0;
	}
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	s_info_p.sym_h = h & 0xfffffff;
	s_info_p.sym_l = (char *)s - s0;
	return s_info_p;
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}

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static struct sym_info_pair gnu_hash(const char *s0)
588
{
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	struct sym_info_pair s_info_p;
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	const unsigned char *s = (void *)s0;
	uint_fast32_t h = 5381;
	for (; *s; s++)
		h += h*32 + *s;
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	s_info_p.sym_h = h;
	s_info_p.sym_l = (char *)s - s0;
	return s_info_p;
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}

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static Sym *sysv_lookup(struct verinfo *verinfo,  struct sym_info_pair s_info_p, struct dso *dso)
600 601
{
	size_t i;
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	uint32_t h = s_info_p.sym_h;
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	Sym *syms = dso->syms;
	Elf_Symndx *hashtab = dso->hashtab;
	char *strings = dso->strings;
	for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
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		if ((!dso->versym || (dso->versym[i] & 0x7fff) >= 0)
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			&& (!memcmp(verinfo->s, strings+syms[i].st_name, s_info_p.sym_l))) {
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			if (!check_verinfo(dso->verdef, dso->versym, i, verinfo, dso->strings)) {
				continue;
			}

613
			return syms+i;
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		}

616
	}
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	LD_LOGD("sysv_lookup not find the symbol, "
		"so:%{public}s s:%{public}s v:%{public}s use_vna_hash:%{public}d vna_hash:%{public}x",
		dso->name, verinfo->s, verinfo->v, verinfo->use_vna_hash, verinfo->vna_hash);
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	return 0;
}

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static Sym *gnu_lookup(struct sym_info_pair s_info_p, uint32_t *hashtab, struct dso *dso, struct verinfo *verinfo)
624
{
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	uint32_t h1 = s_info_p.sym_h;
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	uint32_t nbuckets = hashtab[0];
	uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
	uint32_t i = buckets[h1 % nbuckets];

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	if (!i) {
		LD_LOGD("gnu_lookup symbol not found (bloom filter), so:%{public}s s:%{public}s", dso->name, verinfo->s);
		return 0;
	}
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	uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]);

	for (h1 |= 1; ; i++) {
		uint32_t h2 = *hashval++;
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		if ((h1 == (h2|1)) && (!dso->versym || (dso->versym[i] & 0x7fff) >= 0)
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			&& !memcmp(verinfo->s, dso->strings + dso->syms[i].st_name, s_info_p.sym_l)) {
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			if (!check_verinfo(dso->verdef, dso->versym, i, verinfo, dso->strings)) {
				continue;
			}

645
			return dso->syms+i;
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		}

648 649 650
		if (h2 & 1) break;
	}

651 652 653
	LD_LOGD("gnu_lookup symbol not found, "
		"so:%{public}s s:%{public}s v:%{public}s use_vna_hash:%{public}d vna_hash:%{public}x",
		dso->name, verinfo->s, verinfo->v, verinfo->use_vna_hash, verinfo->vna_hash);
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	return 0;
}

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static bool check_sym_accessible(struct dso *dso, ns_t *ns)
{
	if (!dso || !dso->namespace || !ns) {
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		LD_LOGD("check_sym_accessible invalid parameter!");
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		return false;
	}
	if (dso->namespace == ns) {
		return true;
	}
	for (int i = 0; i < dso->parents_count; i++) {
		if (dso->parents[i]->namespace == ns) {
			return true;
		}
	}
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	LD_LOGD(
		"check_sym_accessible dso name [%{public}s] ns_name [%{public}s] not accessible!", dso->name, ns->ns_name);
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	return false;
}

static int find_dso_parent(struct dso *p, struct dso *target)
{
	int index = -1;
	for (int i = 0; i < p->parents_count; i++) {
		if (p->parents[i] == target) {
			index = i;
			break;
		}
	}
	return index;
}

static void add_dso_parent(struct dso *p, struct dso *parent)
{
	int index = find_dso_parent(p, parent);
	if (index != -1) {
		return;
	}
	if (p->parents_count + 1 > p->parents_capacity) {
		if (p->parents_capacity == 0) {
			p->parents = (struct dso **)internal_malloc(sizeof(struct dso *) * PARENTS_BASE_CAPACITY);
			if (!p->parents) {
				return;
			}
			p->parents_capacity = PARENTS_BASE_CAPACITY;
		} else {
			struct dso ** realloced = (struct dso **)internal_realloc(
				p->parents, sizeof(struct dso *) * (p->parents_capacity + PARENTS_BASE_CAPACITY));
			if (!realloced) {
				return;
			}
			p->parents = realloced;
			p->parents_capacity += PARENTS_BASE_CAPACITY;
		}
	}
	p->parents[p->parents_count] = parent;
	p->parents_count++;
}

static void remove_dso_parent(struct dso *p, struct dso *parent)
{
	int index = find_dso_parent(p, parent);
	if (index == -1) {
		return;
	}
	int i;
	for (i = 0; i < index; i++) {
		p->parents[i] = p->parents[i];
	}
	for (i = index; i < p->parents_count - 1; i++) {
		p->parents[i] = p->parents[i + 1];
	}
	p->parents_count--;
}

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static void add_reloc_can_search_dso(struct dso *p, struct dso *can_search_so)
{
	if (p->reloc_can_search_dso_count + 1 > p->reloc_can_search_dso_capacity) {
		if (p->reloc_can_search_dso_capacity == 0) {
			p->reloc_can_search_dso_list =
				(struct dso **)internal_malloc(sizeof(struct dso *) * RELOC_CAN_SEARCH_DSO_BASE_CAPACITY);
			if (!p->reloc_can_search_dso_list) {
				return;
			}
			p->reloc_can_search_dso_capacity = RELOC_CAN_SEARCH_DSO_BASE_CAPACITY;
		} else {
			struct dso ** realloced = (struct dso **)internal_realloc(
				p->reloc_can_search_dso_list,
				sizeof(struct dso *) * (p->reloc_can_search_dso_capacity + RELOC_CAN_SEARCH_DSO_BASE_CAPACITY));
			if (!realloced) {
				return;
			}
			p->reloc_can_search_dso_list = realloced;
			p->reloc_can_search_dso_capacity += RELOC_CAN_SEARCH_DSO_BASE_CAPACITY;
		}
	}
	p->reloc_can_search_dso_list[p->reloc_can_search_dso_count] = can_search_so;
	p->reloc_can_search_dso_count++;
}

static void free_reloc_can_search_dso(struct dso *p)
{
	if (p->reloc_can_search_dso_list) {
		internal_free(p->reloc_can_search_dso_list);
		p->reloc_can_search_dso_list = NULL;
		p->reloc_can_search_dso_count = 0;
		p->reloc_can_search_dso_capacity = 0;
	}
}

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/* The list of so that can be accessed during relocation include:
 * - The is_global flag of the so is true which means accessible by default.
 *   Global so includes exe, ld preload so and ldso.
 * - We only check whether ns is accessible for the so if is_reloc_head_so_dep is true.
 *
 *   How to set is_reloc_head_so_dep:
 *   When dlopen A, we set is_reloc_head_so_dep to true for
 *   all direct and indirect dependent sos of A, including A itself. */
static void add_can_search_so_list_in_dso(struct dso *dso_relocating, struct dso *start_check_dso) {
	struct dso *p = start_check_dso;
	for (; p; p = p->syms_next) {
		if (p->is_global) {
			add_reloc_can_search_dso(dso_relocating, p);
			continue;
		}

		if (p->is_reloc_head_so_dep) {
			if (dso_relocating->namespace && check_sym_accessible(p, dso_relocating->namespace)) {
				add_reloc_can_search_dso(dso_relocating, p);
			}
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		}
	}
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	return;
}

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#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE)

#ifndef ARCH_SYM_REJECT_UND
#define ARCH_SYM_REJECT_UND(s) 0
#endif

#if defined(__GNUC__)
__attribute__((always_inline))
#endif
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static inline struct symdef find_sym2(struct dso *dso, struct verinfo *verinfo, int need_def, int use_deps, ns_t *ns)
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{
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	struct sym_info_pair s_info_p = gnu_hash(verinfo->s);
	uint32_t h = 0, gh = s_info_p.sym_h, gho = gh / (8*sizeof(size_t)), *ght;
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	size_t ghm = 1ul << gh % (8*sizeof(size_t));
	struct symdef def = {0};
	struct dso **deps = use_deps ? dso->deps : 0;
	for (; dso; dso=use_deps ? *deps++ : dso->syms_next) {
		Sym *sym;
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		if (ns && !check_sym_accessible(dso, ns)) {
			continue;
		}
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		if ((ght = dso->ghashtab)) {
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			GNU_HASH_FILTER(ght, ghm, gho)
			sym = gnu_lookup(s_info_p, ght, dso, verinfo);
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		} else {
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			if (!h) s_info_p = sysv_hash(verinfo->s);
			sym = sysv_lookup(verinfo, s_info_p, dso);
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		}
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		if (!sym) continue;
		if (!sym->st_shndx)
			if (need_def || (sym->st_info&0xf) == STT_TLS
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				|| ARCH_SYM_REJECT_UND(sym))
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				continue;
		if (!sym->st_value)
			if ((sym->st_info&0xf) != STT_TLS)
				continue;
		if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue;
		if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue;
		def.sym = sym;
		def.dso = dso;
		break;
	}
	return def;
}

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static inline struct symdef find_sym_by_saved_so_list(
	int sym_type, struct dso *dso, struct verinfo *verinfo, int need_def, struct dso *dso_relocating)
{
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	struct sym_info_pair s_info_p = gnu_hash(verinfo->s);
	uint32_t h = 0, gh = s_info_p.sym_h, gho = gh / (8 * sizeof(size_t)), *ght;
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	size_t ghm = 1ul << gh % (8 * sizeof(size_t));
	struct symdef def = {0};
	// skip head dso.
	int start_search_index = sym_type==REL_COPY ? 1 : 0;
	struct dso *dso_searching = 0;
	for (int i = start_search_index; i < dso_relocating->reloc_can_search_dso_count; i++) {
		dso_searching = dso_relocating->reloc_can_search_dso_list[i];
		Sym *sym;
		if ((ght = dso_searching->ghashtab)) {
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			GNU_HASH_FILTER(ght, ghm, gho)
			sym = gnu_lookup(s_info_p, ght, dso_searching, verinfo);
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		} else {
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			if (!h) s_info_p = sysv_hash(verinfo->s);
			sym = sysv_lookup(verinfo, s_info_p, dso_searching);
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		}
		if (!sym) continue;
		if (!sym->st_shndx)
			if (need_def || (sym->st_info&0xf) == STT_TLS
				|| ARCH_SYM_REJECT_UND(sym))
				continue;
		if (!sym->st_value)
			if ((sym->st_info&0xf) != STT_TLS)
				continue;
		if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue;
		if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue;
		def.sym = sym;
		def.dso = dso_searching;
		break;
	}
	return def;
}

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static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
{
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	struct verinfo verinfo = { .s = s, .v = "", .use_vna_hash = false };
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	return find_sym2(dso, &verinfo, need_def, 0, NULL);
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}

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static bool get_vna_hash(struct dso *dso, int sym_index, uint32_t *vna_hash)
{
	if (!dso->versym || !dso->verneed) {
		return false;
	}

	uint16_t vsym = dso->versym[sym_index];
	if (vsym == VER_NDX_LOCAL || vsym == VER_NDX_GLOBAL) {
		return false;
	}

	bool result = false;
	Verneed *verneed = dso->verneed;
	Vernaux *vernaux;
	vsym &= 0x7fff;

	for(;;) {
		vernaux = (Vernaux *)((char *)verneed + verneed->vn_aux);

		for (size_t cnt = 0; cnt < verneed->vn_cnt; cnt++) {
			if ((vernaux->vna_other & 0x7fff) == vsym) {
				result = true;
				*vna_hash = vernaux->vna_hash;
				break;
			}

			vernaux = (Vernaux *)((char *)vernaux + vernaux->vna_next);
		}

		if (result) {
			break;
		}

		if (verneed->vn_next == 0) {
			break;
		}

		verneed = (Verneed *)((char *)verneed + verneed->vn_next);
	}
	return result;
}

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static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
{
	unsigned char *base = dso->base;
	Sym *syms = dso->syms;
	char *strings = dso->strings;
	Sym *sym;
	const char *name;
	void *ctx;
	int type;
	int sym_index;
	struct symdef def;
	size_t *reloc_addr;
	size_t sym_val;
	size_t tls_val;
	size_t addend;
	int skip_relative = 0, reuse_addends = 0, save_slot = 0;

	if (dso == &ldso) {
		/* Only ldso's REL table needs addend saving/reuse. */
		if (rel == apply_addends_to)
			reuse_addends = 1;
		skip_relative = 1;
	}

	for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
		if (skip_relative && IS_RELATIVE(rel[1], dso->syms)) continue;
		type = R_TYPE(rel[1]);
		if (type == REL_NONE) continue;
		reloc_addr = laddr(dso, rel[0]);

		if (stride > 2) {
			addend = rel[2];
		} else if (type==REL_GOT || type==REL_PLT|| type==REL_COPY) {
			addend = 0;
		} else if (reuse_addends) {
			/* Save original addend in stage 2 where the dso
			 * chain consists of just ldso; otherwise read back
			 * saved addend since the inline one was clobbered. */
			if (head==&ldso)
				saved_addends[save_slot] = *reloc_addr;
			addend = saved_addends[save_slot++];
		} else {
			addend = *reloc_addr;
		}

		sym_index = R_SYM(rel[1]);
		if (sym_index) {
			sym = syms + sym_index;
			name = strings + sym->st_name;
			ctx = type==REL_COPY ? head->syms_next : head;
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			struct verinfo vinfo = { .s = name, .v = "" };
			vinfo.use_vna_hash = get_vna_hash(dso, sym_index, &vinfo.vna_hash);
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			if (dso->cache_sym_index == sym_index) {
				def = (struct symdef){ .dso = dso->cache_dso, .sym = dso->cache_sym };
			} else {
				def = (sym->st_info>>4) == STB_LOCAL
					? (struct symdef){ .dso = dso, .sym = sym }
					: dso != &ldso ? find_sym_by_saved_so_list(type, ctx, &vinfo, type==REL_PLT, dso)
					: find_sym2(ctx, &vinfo, type==REL_PLT, 0, dso->namespace);
				dso->cache_sym_index = sym_index;
				dso->cache_dso = def.dso;
				dso->cache_sym = def.sym;
			}

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			if (!def.sym && (sym->st_shndx != SHN_UNDEF
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				|| sym->st_info>>4 != STB_WEAK)) {
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				if (dso->lazy && (type==REL_PLT || type==REL_GOT)) {
					dso->lazy[3*dso->lazy_cnt+0] = rel[0];
					dso->lazy[3*dso->lazy_cnt+1] = rel[1];
					dso->lazy[3*dso->lazy_cnt+2] = addend;
					dso->lazy_cnt++;
					continue;
				}
997 998 999
				LD_LOGE("relocating failed: symbol not found. "
					"dso=%{public}s s=%{public}s use_vna_hash=%{public}d van_hash=%{public}x",
					dso->name, name, vinfo.use_vna_hash, vinfo.vna_hash);
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
				error("Error relocating %s: %s: symbol not found",
					dso->name, name);
				if (runtime) longjmp(*rtld_fail, 1);
				continue;
			}
		} else {
			sym = 0;
			def.sym = 0;
			def.dso = dso;
		}

		sym_val = def.sym ? (size_t)laddr(def.dso, def.sym->st_value) : 0;
		tls_val = def.sym ? def.sym->st_value : 0;

		if ((type == REL_TPOFF || type == REL_TPOFF_NEG)
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			&& def.dso->tls_id > static_tls_cnt) {
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
			error("Error relocating %s: %s: initial-exec TLS "
				"resolves to dynamic definition in %s",
				dso->name, name, def.dso->name);
			longjmp(*rtld_fail, 1);
		}

		switch(type) {
		case REL_NONE:
			break;
		case REL_OFFSET:
			addend -= (size_t)reloc_addr;
		case REL_SYMBOLIC:
		case REL_GOT:
		case REL_PLT:
			*reloc_addr = sym_val + addend;
			break;
		case REL_USYMBOLIC:
			memcpy(reloc_addr, &(size_t){sym_val + addend}, sizeof(size_t));
			break;
		case REL_RELATIVE:
			*reloc_addr = (size_t)base + addend;
			break;
		case REL_SYM_OR_REL:
			if (sym) *reloc_addr = sym_val + addend;
			else *reloc_addr = (size_t)base + addend;
			break;
		case REL_COPY:
			memcpy(reloc_addr, (void *)sym_val, sym->st_size);
			break;
		case REL_OFFSET32:
			*(uint32_t *)reloc_addr = sym_val + addend
				- (size_t)reloc_addr;
			break;
		case REL_FUNCDESC:
			*reloc_addr = def.sym ? (size_t)(def.dso->funcdescs
				+ (def.sym - def.dso->syms)) : 0;
			break;
		case REL_FUNCDESC_VAL:
			if ((sym->st_info&0xf) == STT_SECTION) *reloc_addr += sym_val;
			else *reloc_addr = sym_val;
			reloc_addr[1] = def.sym ? (size_t)def.dso->got : 0;
			break;
		case REL_DTPMOD:
			*reloc_addr = def.dso->tls_id;
			break;
		case REL_DTPOFF:
			*reloc_addr = tls_val + addend - DTP_OFFSET;
			break;
#ifdef TLS_ABOVE_TP
		case REL_TPOFF:
			*reloc_addr = tls_val + def.dso->tls.offset + TPOFF_K + addend;
			break;
#else
		case REL_TPOFF:
			*reloc_addr = tls_val - def.dso->tls.offset + addend;
			break;
		case REL_TPOFF_NEG:
			*reloc_addr = def.dso->tls.offset - tls_val + addend;
			break;
#endif
		case REL_TLSDESC:
			if (stride<3) addend = reloc_addr[1];
			if (def.dso->tls_id > static_tls_cnt) {
1079
				struct td_index *new = internal_malloc(sizeof *new);
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
				if (!new) {
					error(
					"Error relocating %s: cannot allocate TLSDESC for %s",
					dso->name, sym ? name : "(local)" );
					longjmp(*rtld_fail, 1);
				}
				new->next = dso->td_index;
				dso->td_index = new;
				new->args[0] = def.dso->tls_id;
				new->args[1] = tls_val + addend - DTP_OFFSET;
				reloc_addr[0] = (size_t)__tlsdesc_dynamic;
				reloc_addr[1] = (size_t)new;
			} else {
				reloc_addr[0] = (size_t)__tlsdesc_static;
#ifdef TLS_ABOVE_TP
				reloc_addr[1] = tls_val + def.dso->tls.offset
					+ TPOFF_K + addend;
#else
				reloc_addr[1] = tls_val - def.dso->tls.offset
					+ addend;
#endif
			}
#ifdef TLSDESC_BACKWARDS
			/* Some archs (32-bit ARM at least) invert the order of
			 * the descriptor members. Fix them up here. */
			size_t tmp = reloc_addr[0];
			reloc_addr[0] = reloc_addr[1];
			reloc_addr[1] = tmp;
#endif
			break;
		default:
			error("Error relocating %s: unsupported relocation type %d",
				dso->name, type);
			if (runtime) longjmp(*rtld_fail, 1);
			continue;
		}
	}
}

static void redo_lazy_relocs()
{
	struct dso *p = lazy_head, *next;
	lazy_head = 0;
	for (; p; p=next) {
		next = p->lazy_next;
		size_t size = p->lazy_cnt*3*sizeof(size_t);
		p->lazy_cnt = 0;
		do_relocs(p, p->lazy, size, 3);
		if (p->lazy_cnt) {
			p->lazy_next = lazy_head;
			lazy_head = p;
		} else {
1132
			internal_free(p->lazy);
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
			p->lazy = 0;
			p->lazy_next = 0;
		}
	}
}

/* A huge hack: to make up for the wastefulness of shared libraries
 * needing at least a page of dirty memory even if they have no global
 * data, we reclaim the gaps at the beginning and end of writable maps
 * and "donate" them to the heap. */

static void reclaim(struct dso *dso, size_t start, size_t end)
{
	if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end;
	if (end   >= dso->relro_start && end   < dso->relro_end) end = dso->relro_start;
	if (start >= end) return;
	char *base = laddr_pg(dso, start);
	__malloc_donate(base, base+(end-start));
}

static void reclaim_gaps(struct dso *dso)
{
	Phdr *ph = dso->phdr;
	size_t phcnt = dso->phnum;

	for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) {
		if (ph->p_type!=PT_LOAD) continue;
		if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
		reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
		reclaim(dso, ph->p_vaddr+ph->p_memsz,
			ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
	}
}

static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t off)
{
	static int no_map_fixed;
	char *q;
	if (!no_map_fixed) {
		q = mmap(p, n, prot, flags|MAP_FIXED, fd, off);
		if (!DL_NOMMU_SUPPORT || q != MAP_FAILED || errno != EINVAL)
			return q;
		no_map_fixed = 1;
	}
	/* Fallbacks for MAP_FIXED failure on NOMMU kernels. */
	if (flags & MAP_ANONYMOUS) {
		memset(p, 0, n);
		return p;
	}
	ssize_t r;
	if (lseek(fd, off, SEEK_SET) < 0) return MAP_FAILED;
	for (q=p; n; q+=r, off+=r, n-=r) {
		r = read(fd, q, n);
		if (r < 0 && errno != EINTR) return MAP_FAILED;
		if (!r) {
			memset(q, 0, n);
			break;
		}
	}
	return p;
}

static void unmap_library(struct dso *dso)
{
	if (dso->loadmap) {
		size_t i;
		for (i=0; i<dso->loadmap->nsegs; i++) {
			if (!dso->loadmap->segs[i].p_memsz)
				continue;
			munmap((void *)dso->loadmap->segs[i].addr,
				dso->loadmap->segs[i].p_memsz);
		}
1205
		internal_free(dso->loadmap);
1206 1207 1208 1209 1210
	} else if (dso->map && dso->map_len) {
		munmap(dso->map, dso->map_len);
	}
}

1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
static bool get_random(void *buf, size_t buflen)
{
	int ret;
	int fd = open("/dev/urandom", O_RDONLY);
	if (fd < 0) {
		return false;
	}

	ret = read(fd, buf, buflen);
	if (ret < 0) {
		close(fd);
		return false;
	}

	close(fd);
	return true;
}

static void fill_random_data(void *buf, size_t buflen)
{
	uint64_t x;
	int i;
	int pos = 0;
	struct timespec ts;
	/* Try to use urandom to get the random number first */
	if (!get_random(buf, buflen)) {
		/* Can't get random number from /dev/urandom, generate from addr based on ASLR and time */
		for (i = 1; i <= (buflen / sizeof(x)); i++) {
			(void)clock_gettime(CLOCK_REALTIME, &ts);
			x = (((uint64_t)get_random) << 32) ^ (uint64_t)fill_random_data ^ ts.tv_nsec;
			memcpy((char *)buf + pos, &x, sizeof(x));
			pos += sizeof(x);
		}
	}
	return;
}

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static void *map_library(int fd, struct dso *dso, struct reserved_address_params *reserved_params)
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
{
	Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
	void *allocated_buf=0;
	size_t phsize;
	size_t addr_min=SIZE_MAX, addr_max=0, map_len;
	size_t this_min, this_max;
	size_t nsegs = 0;
	off_t off_start;
	Ehdr *eh;
	Phdr *ph, *ph0;
	unsigned prot;
	unsigned char *map=MAP_FAILED, *base;
	size_t dyn=0;
	size_t tls_image=0;
	size_t i;
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	int map_flags = MAP_PRIVATE;
	size_t start_addr;
1266 1267 1268 1269 1270 1271 1272 1273

	ssize_t l = read(fd, buf, sizeof buf);
	eh = buf;
	if (l<0) return 0;
	if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC))
		goto noexec;
	phsize = eh->e_phentsize * eh->e_phnum;
	if (phsize > sizeof buf - sizeof *eh) {
1274
		allocated_buf = internal_malloc(phsize);
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
		if (!allocated_buf) return 0;
		l = pread(fd, allocated_buf, phsize, eh->e_phoff);
		if (l < 0) goto error;
		if (l != phsize) goto noexec;
		ph = ph0 = allocated_buf;
	} else if (eh->e_phoff + phsize > l) {
		l = pread(fd, buf+1, phsize, eh->e_phoff);
		if (l < 0) goto error;
		if (l != phsize) goto noexec;
		ph = ph0 = (void *)(buf + 1);
	} else {
		ph = ph0 = (void *)((char *)buf + eh->e_phoff);
	}
	for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
		if (ph->p_type == PT_DYNAMIC) {
			dyn = ph->p_vaddr;
		} else if (ph->p_type == PT_TLS) {
			tls_image = ph->p_vaddr;
			dso->tls.align = ph->p_align;
			dso->tls.len = ph->p_filesz;
			dso->tls.size = ph->p_memsz;
		} else if (ph->p_type == PT_GNU_RELRO) {
			dso->relro_start = ph->p_vaddr & -PAGE_SIZE;
			dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
		} else if (ph->p_type == PT_GNU_STACK) {
			if (!runtime && ph->p_memsz > __default_stacksize) {
				__default_stacksize =
					ph->p_memsz < DEFAULT_STACK_MAX ?
					ph->p_memsz : DEFAULT_STACK_MAX;
			}
		}
		if (ph->p_type != PT_LOAD) continue;
		nsegs++;
		if (ph->p_vaddr < addr_min) {
			addr_min = ph->p_vaddr;
			off_start = ph->p_offset;
			prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
				((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
				((ph->p_flags&PF_X) ? PROT_EXEC : 0));
		}
		if (ph->p_vaddr+ph->p_memsz > addr_max) {
			addr_max = ph->p_vaddr+ph->p_memsz;
		}
	}
	if (!dyn) goto noexec;
	if (DL_FDPIC && !(eh->e_flags & FDPIC_CONSTDISP_FLAG)) {
1321
		dso->loadmap = internal_calloc(1, sizeof *dso->loadmap
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364
			+ nsegs * sizeof *dso->loadmap->segs);
		if (!dso->loadmap) goto error;
		dso->loadmap->nsegs = nsegs;
		for (ph=ph0, i=0; i<nsegs; ph=(void *)((char *)ph+eh->e_phentsize)) {
			if (ph->p_type != PT_LOAD) continue;
			prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
				((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
				((ph->p_flags&PF_X) ? PROT_EXEC : 0));
			map = mmap(0, ph->p_memsz + (ph->p_vaddr & PAGE_SIZE-1),
				prot, MAP_PRIVATE,
				fd, ph->p_offset & -PAGE_SIZE);
			if (map == MAP_FAILED) {
				unmap_library(dso);
				goto error;
			}
			dso->loadmap->segs[i].addr = (size_t)map +
				(ph->p_vaddr & PAGE_SIZE-1);
			dso->loadmap->segs[i].p_vaddr = ph->p_vaddr;
			dso->loadmap->segs[i].p_memsz = ph->p_memsz;
			i++;
			if (prot & PROT_WRITE) {
				size_t brk = (ph->p_vaddr & PAGE_SIZE-1)
					+ ph->p_filesz;
				size_t pgbrk = brk + PAGE_SIZE-1 & -PAGE_SIZE;
				size_t pgend = brk + ph->p_memsz - ph->p_filesz
					+ PAGE_SIZE-1 & -PAGE_SIZE;
				if (pgend > pgbrk && mmap_fixed(map+pgbrk,
					pgend-pgbrk, prot,
					MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS,
					-1, off_start) == MAP_FAILED)
					goto error;
				memset(map + brk, 0, pgbrk-brk);
			}
		}
		map = (void *)dso->loadmap->segs[0].addr;
		map_len = 0;
		goto done_mapping;
	}
	addr_max += PAGE_SIZE-1;
	addr_max &= -PAGE_SIZE;
	addr_min &= -PAGE_SIZE;
	off_start &= -PAGE_SIZE;
	map_len = addr_max - addr_min + off_start;
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	start_addr = addr_min;
	if (reserved_params) {
		if (map_len > reserved_params->reserved_size) {
			if (reserved_params->must_use_reserved) {
				goto error;
			}
		} else {
			start_addr = ((size_t)reserved_params->start_addr - 1 + PAGE_SIZE) & -PAGE_SIZE;
			map_flags |= MAP_FIXED;
		}
	}
1376 1377 1378 1379 1380
	/* The first time, we map too much, possibly even more than
	 * the length of the file. This is okay because we will not
	 * use the invalid part; we just need to reserve the right
	 * amount of virtual address space to map over later. */
	map = DL_NOMMU_SUPPORT
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		? mmap((void *)start_addr, map_len, PROT_READ|PROT_WRITE|PROT_EXEC,
1382
			MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
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		: mmap((void *)start_addr, map_len, prot,
			map_flags, fd, off_start);
1385
	if (map==MAP_FAILED) goto error;
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	if (reserved_params && map_len < reserved_params->reserved_size) {
		reserved_params->reserved_size -= (map_len + (start_addr - (size_t)reserved_params->start_addr));
		reserved_params->start_addr = (void *)((uint8_t *)map + map_len);
	}
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
	dso->map = map;
	dso->map_len = map_len;
	/* If the loaded file is not relocatable and the requested address is
	 * not available, then the load operation must fail. */
	if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) {
		errno = EBUSY;
		goto error;
	}
	base = map - addr_min;
	dso->phdr = 0;
	dso->phnum = 0;
	for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
1402 1403 1404 1405
		if (ph->p_type == PT_OHOS_RANDOMDATA) {
			fill_random_data((void *)(ph->p_vaddr + base), ph->p_memsz);
			continue;
		}
1406 1407 1408 1409
		if (ph->p_type != PT_LOAD) continue;
		/* Check if the programs headers are in this load segment, and
		 * if so, record the address for use by dl_iterate_phdr. */
		if (!dso->phdr && eh->e_phoff >= ph->p_offset
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			&& eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) {
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
			dso->phdr = (void *)(base + ph->p_vaddr
				+ (eh->e_phoff-ph->p_offset));
			dso->phnum = eh->e_phnum;
			dso->phentsize = eh->e_phentsize;
		}
		this_min = ph->p_vaddr & -PAGE_SIZE;
		this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE;
		off_start = ph->p_offset & -PAGE_SIZE;
		prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
			((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
			((ph->p_flags&PF_X) ? PROT_EXEC : 0));
		/* Reuse the existing mapping for the lowest-address LOAD */
		if ((ph->p_vaddr & -PAGE_SIZE) != addr_min || DL_NOMMU_SUPPORT)
			if (mmap_fixed(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
				goto error;
		if (ph->p_memsz > ph->p_filesz && (ph->p_flags&PF_W)) {
			size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
			size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
			memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
			if (pgbrk-(size_t)base < this_max && mmap_fixed((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED)
				goto error;
		}
	}
	for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
		if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
			if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC)
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				&& errno != ENOSYS)
1438 1439 1440 1441 1442 1443 1444
				goto error;
			break;
		}
done_mapping:
	dso->base = base;
	dso->dynv = laddr(dso, dyn);
	if (dso->tls.size) dso->tls.image = laddr(dso, tls_image);
1445
	internal_free(allocated_buf);
1446 1447 1448 1449 1450
	return map;
noexec:
	errno = ENOEXEC;
error:
	if (map!=MAP_FAILED) unmap_library(dso);
1451
	internal_free(allocated_buf);
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
	return 0;
}

static int path_open(const char *name, const char *s, char *buf, size_t buf_size)
{
	size_t l;
	int fd;
	for (;;) {
		s += strspn(s, ":\n");
		l = strcspn(s, ":\n");
		if (l-1 >= INT_MAX) return -1;
		if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) < buf_size) {
			if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
			switch (errno) {
			case ENOENT:
			case ENOTDIR:
			case EACCES:
			case ENAMETOOLONG:
				break;
			default:
				/* Any negative value but -1 will inhibit
				 * futher path search. */
				return -2;
			}
		}
		s += l;
	}
}

static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
{
	size_t n, l;
	const char *s, *t, *origin;
	char *d;
	if (p->rpath || !p->rpath_orig) return 0;
	if (!strchr(p->rpath_orig, '$')) {
		p->rpath = p->rpath_orig;
		return 0;
	}
	n = 0;
	s = p->rpath_orig;
	while ((t=strchr(s, '$'))) {
		if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9))
			return 0;
		s = t+1;
		n++;
	}
	if (n > SSIZE_MAX/PATH_MAX) return 0;

	if (p->kernel_mapped) {
		/* $ORIGIN searches cannot be performed for the main program
		 * when it is suid/sgid/AT_SECURE. This is because the
		 * pathname is under the control of the caller of execve.
		 * For libraries, however, $ORIGIN can be processed safely
		 * since the library's pathname came from a trusted source
		 * (either system paths or a call to dlopen). */
		if (libc.secure)
			return 0;
		l = readlink("/proc/self/exe", buf, buf_size);
		if (l == -1) switch (errno) {
		case ENOENT:
		case ENOTDIR:
		case EACCES:
			break;
		default:
			return -1;
		}
		if (l >= buf_size)
			return 0;
		buf[l] = 0;
		origin = buf;
	} else {
		origin = p->name;
	}
	t = strrchr(origin, '/');
	if (t) {
		l = t-origin;
	} else {
		/* Normally p->name will always be an absolute or relative
		 * pathname containing at least one '/' character, but in the
		 * case where ldso was invoked as a command to execute a
		 * program in the working directory, app.name may not. Fix. */
		origin = ".";
		l = 1;
	}
	/* Disallow non-absolute origins for suid/sgid/AT_SECURE. */
	if (libc.secure && *origin != '/')
		return 0;
1540
	p->rpath = internal_malloc(strlen(p->rpath_orig) + n*l + 1);
1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575
	if (!p->rpath) return -1;

	d = p->rpath;
	s = p->rpath_orig;
	while ((t=strchr(s, '$'))) {
		memcpy(d, s, t-s);
		d += t-s;
		memcpy(d, origin, l);
		d += l;
		/* It was determined previously that the '$' is followed
		 * either by "ORIGIN" or "{ORIGIN}". */
		s = t + 7 + 2*(t[1]=='{');
	}
	strcpy(d, s);
	return 0;
}

static void decode_dyn(struct dso *p)
{
	size_t dyn[DYN_CNT];
	decode_vec(p->dynv, dyn, DYN_CNT);
	p->syms = laddr(p, dyn[DT_SYMTAB]);
	p->strings = laddr(p, dyn[DT_STRTAB]);
	if (dyn[0]&(1<<DT_HASH))
		p->hashtab = laddr(p, dyn[DT_HASH]);
	if (dyn[0]&(1<<DT_RPATH))
		p->rpath_orig = p->strings + dyn[DT_RPATH];
	if (dyn[0]&(1<<DT_RUNPATH))
		p->rpath_orig = p->strings + dyn[DT_RUNPATH];
	if (dyn[0]&(1<<DT_PLTGOT))
		p->got = laddr(p, dyn[DT_PLTGOT]);
	if (search_vec(p->dynv, dyn, DT_GNU_HASH))
		p->ghashtab = laddr(p, *dyn);
	if (search_vec(p->dynv, dyn, DT_VERSYM))
		p->versym = laddr(p, *dyn);
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	if (search_vec(p->dynv, dyn, DT_VERDEF))
		p->verdef = laddr(p, *dyn);
	if (search_vec(p->dynv, dyn, DT_VERNEED))
		p->verneed = laddr(p, *dyn);
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}

static size_t count_syms(struct dso *p)
{
	if (p->hashtab) return p->hashtab[1];

	size_t nsym, i;
	uint32_t *buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
	uint32_t *hashval;
	for (i = nsym = 0; i < p->ghashtab[0]; i++) {
		if (buckets[i] > nsym)
			nsym = buckets[i];
	}
	if (nsym) {
		hashval = buckets + p->ghashtab[0] + (nsym - p->ghashtab[1]);
		do nsym++;
		while (!(*hashval++ & 1));
	}
	return nsym;
}

static void *dl_mmap(size_t n)
{
	void *p;
	int prot = PROT_READ|PROT_WRITE, flags = MAP_ANONYMOUS|MAP_PRIVATE;
#ifdef SYS_mmap2
	p = (void *)__syscall(SYS_mmap2, 0, n, prot, flags, -1, 0);
#else
	p = (void *)__syscall(SYS_mmap, 0, n, prot, flags, -1, 0);
#endif
	return (unsigned long)p > -4096UL ? 0 : p;
}

static void makefuncdescs(struct dso *p)
{
	static int self_done;
	size_t nsym = count_syms(p);
	size_t i, size = nsym * sizeof(*p->funcdescs);

	if (!self_done) {
		p->funcdescs = dl_mmap(size);
		self_done = 1;
	} else {
1623
		p->funcdescs = internal_malloc(size);
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
	}
	if (!p->funcdescs) {
		if (!runtime) a_crash();
		error("Error allocating function descriptors for %s", p->name);
		longjmp(*rtld_fail, 1);
	}
	for (i=0; i<nsym; i++) {
		if ((p->syms[i].st_info&0xf)==STT_FUNC && p->syms[i].st_shndx) {
			p->funcdescs[i].addr = laddr(p, p->syms[i].st_value);
			p->funcdescs[i].got = p->got;
		} else {
			p->funcdescs[i].addr = 0;
			p->funcdescs[i].got = 0;
		}
	}
}

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static void get_sys_path(ns_configor *conf)
{ 
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	LD_LOGD("get_sys_path g_is_asan:%{public}d", g_is_asan);
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	/* Use ini file's system paths when Asan is not enabled */
	if (!g_is_asan) {
		sys_path = conf->get_sys_paths();
	} else {
		/* Use ini file's asan system paths when the Asan is enabled
		 * Merge two strings when both sys_paths and asan_sys_paths are valid */
		sys_path = conf->get_asan_sys_paths();
		char *sys_path_default = conf->get_sys_paths();
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		if (!sys_path) {
			sys_path = sys_path_default;
		} else if (sys_path_default) {
			size_t newlen = strlen(sys_path) + strlen(sys_path_default) + 2;
1656
			char *new_syspath = internal_malloc(newlen);
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			memset(new_syspath, 0, newlen);
			strcpy(new_syspath, sys_path);
			strcat(new_syspath, ":");
			strcat(new_syspath, sys_path_default);
			sys_path = new_syspath;
		}
	}
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	if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib:/lib64";
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	LD_LOGD("get_sys_path sys_path:%{public}s", sys_path);
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}

static struct dso *search_dso_by_name(const char *name, const ns_t *ns) {
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	LD_LOGD("search_dso_by_name name:%{public}s, ns_name:%{public}s", name, ns ? ns->ns_name: "NULL");
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	for (size_t i = 0; i < ns->ns_dsos->num; i++){
		struct dso *p = ns->ns_dsos->dsos[i];
		if (p->shortname && !strcmp(p->shortname, name)) {
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			LD_LOGD("search_dso_by_name found name:%{public}s, ns_name:%{public}s", name, ns ? ns->ns_name: "NULL");
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			return p;
		}
	}
	return NULL;
}

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static struct dso *search_dso_by_fstat(const struct stat *st, const ns_t *ns, uint64_t file_offset) {
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	LD_LOGD("search_dso_by_fstat ns_name:%{public}s", ns ? ns->ns_name : "NULL");
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	for (size_t i = 0; i < ns->ns_dsos->num; i++){
		struct dso *p = ns->ns_dsos->dsos[i];
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		if (p->dev == st->st_dev && p->ino == st->st_ino && p->file_offset == file_offset) {
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			LD_LOGD("search_dso_by_fstat found dev:%{public}lu, ino:%{public}lu, ns_name:%{public}s",
				st->st_dev, st->st_ino, ns ? ns->ns_name : "NULL");
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			return p;
		}
	}
	return NULL;
}
/* Find loaded so by name */
static struct dso *find_library_by_name(const char *name, const ns_t *ns, bool check_inherited)
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{
	LD_LOGD("find_library_by_name name:%{public}s, ns_name:%{public}s, check_inherited:%{public}d",
		name,
		ns ? ns->ns_name : "NULL",
		!!check_inherited);
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	struct dso *p = search_dso_by_name(name, ns);
	if (p) return p;
	if (check_inherited && ns->ns_inherits) {
		for (size_t i = 0; i < ns->ns_inherits->num; i++){
			ns_inherit * inherit = ns->ns_inherits->inherits[i];
			p = search_dso_by_name(name, inherit->inherited_ns);
			if (p && is_sharable(inherit, name)) return p;
		}
	}
	return NULL;
}
/* Find loaded so by file stat */
1711
static struct dso *find_library_by_fstat(const struct stat *st, const ns_t *ns, bool check_inherited, uint64_t file_offset) {
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	LD_LOGD("find_library_by_fstat ns_name:%{public}s, check_inherited :%{public}d",
		ns ? ns->ns_name : "NULL",
		!!check_inherited);
1715
	struct dso *p = search_dso_by_fstat(st, ns, file_offset);
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	if (p) return p;
	if (check_inherited && ns->ns_inherits) {
		for (size_t i = 0; i < ns->ns_inherits->num; i++){
			ns_inherit *inherit = ns->ns_inherits->inherits[i];
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			p = search_dso_by_fstat(st, inherit->inherited_ns, file_offset);
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			if (p && is_sharable(inherit, p->shortname)) return p;
		}
	}
	return NULL;
}
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#ifndef LOAD_ORDER_RANDOMIZATION
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/* add namespace function */
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struct dso *load_library(
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	const char *name, struct dso *needed_by, ns_t *namespace, bool check_inherited, struct reserved_address_params *reserved_params)
1731
{
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	char buf[PATH_MAX+1];
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	const char *pathname;
	unsigned char *map;
	struct dso *p, temp_dso = {0};
	int fd;
	struct stat st;
	size_t alloc_size;
	int n_th = 0;
	int is_self = 0;

	if (!*name) {
		errno = EINVAL;
		return 0;
	}

	/* Catch and block attempts to reload the implementation itself */
	if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
		static const char reserved[] =
			"c.pthread.rt.m.dl.util.xnet.";
		const char *rp, *next;
		for (rp=reserved; *rp; rp=next) {
			next = strchr(rp, '.') + 1;
			if (strncmp(name+3, rp, next-rp) == 0)
				break;
		}
		if (*rp) {
			if (ldd_mode) {
				/* Track which names have been resolved
				 * and only report each one once. */
				static unsigned reported;
				unsigned mask = 1U<<(rp-reserved);
				if (!(reported & mask)) {
					reported |= mask;
					dprintf(1, "\t%s => %s (%p)\n",
						name, ldso.name,
						ldso.base);
				}
			}
			is_self = 1;
		}
	}
	if (!strcmp(name, ldso.name)) is_self = 1;
	if (is_self) {
		if (!ldso.prev) {
			tail->next = &ldso;
			ldso.prev = tail;
			tail = &ldso;
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			ldso.namespace = namespace;
			ns_add_dso(namespace, &ldso);
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		}
		return &ldso;
	}
	if (strchr(name, '/')) {
		pathname = name;
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		if (!is_accessible(namespace, pathname, g_is_asan, check_inherited)) {
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			fd = -1;
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			LD_LOGD("load_library is_accessible return false,fd = -1");
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		} else {
			fd = open(name, O_RDONLY|O_CLOEXEC);
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			LD_LOGD("load_library is_accessible return true, open file fd:%{public}d .", fd);
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		}
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	} else {
		/* Search for the name to see if it's already loaded */
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		/* Search in namespace */
		p = find_library_by_name(name, namespace, check_inherited);
		if (p) {
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			LD_LOGD("load_library find_library_by_name found p, return it!");
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			return p;
1801
		}
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		if (strlen(name) > NAME_MAX) {
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			LD_LOGE("load_library name exceeding the maximum length, return 0!");
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			return 0;
		}
1806
		fd = -1;
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		if (namespace->env_paths) fd = path_open(name, namespace->env_paths, buf, sizeof buf);
		for (p = needed_by; fd == -1 && p; p = p->needed_by) {
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			if (fixup_rpath(p, buf, sizeof buf) < 0) {
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				LD_LOGD("load_library Inhibit further search,fd = -2.");
1811
				fd = -2; /* Inhibit further search. */
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			}
			if (p->rpath) {
1814
				fd = path_open(name, p->rpath, buf, sizeof buf);
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				LD_LOGD("load_library  p->rpath path_open fd:%{public}d.", fd);
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			}

1818
		}
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		if (g_is_asan) {
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			fd = handle_asan_path_open(fd, name, namespace, buf, sizeof buf);
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			LD_LOGD("load_library handle_asan_path_open fd:%{public}d.", fd);
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		} else {
			if (fd == -1 && namespace->lib_paths) {
				fd = path_open(name, namespace->lib_paths, buf, sizeof buf);
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				LD_LOGD("load_library no asan lib_paths path_open fd:%{public}d.", fd);
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			}
1827 1828
		}
		pathname = buf;
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		LD_LOGD("load_library lib_paths pathname:%{public}s.", pathname);
1830
	}
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	if (fd < 0) {
		if (!check_inherited || !namespace->ns_inherits) return 0;
		/* Load lib in inherited namespace. Do not check inherited again.*/
		for (size_t i = 0; i < namespace->ns_inherits->num; i++) {
			ns_inherit *inherit = namespace->ns_inherits->inherits[i];
			if (strchr(name, '/')==0 && !is_sharable(inherit, name)) continue;
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			p = load_library(name, needed_by, inherit->inherited_ns, false, reserved_params);
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			if (p) {
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				LD_LOGD("load_library search in inherited, found p ,inherited_ns name:%{public}s",
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						inherit->inherited_ns->ns_name);
				return p;
			}
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		}
		return 0;
	}
1846 1847
	if (fstat(fd, &st) < 0) {
		close(fd);
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		LD_LOGE("load_library fstat < 0,return 0!");
1849 1850
		return 0;
	}
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	/* Search in namespace */
1852
	p = find_library_by_fstat(&st, namespace, check_inherited, 0);
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	if (p) {
		/* If this library was previously loaded with a
		* pathname but a search found the same inode,
		* setup its shortname so it can be found by name. */
		if (!p->shortname && pathname != name)
			p->shortname = strrchr(p->name, '/')+1;
		close(fd);
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		LD_LOGD("load_library find_library_by_fstat, found p and return it!");
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		return p;
1862
	}
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	map = noload ? 0 : map_library(fd, &temp_dso, reserved_params);
1864 1865 1866 1867 1868 1869 1870 1871 1872
	close(fd);
	if (!map) return 0;

	/* Avoid the danger of getting two versions of libc mapped into the
	 * same process when an absolute pathname was used. The symbols
	 * checked are chosen to catch both musl and glibc, and to avoid
	 * false positives from interposition-hack libraries. */
	decode_dyn(&temp_dso);
	if (find_sym(&temp_dso, "__libc_start_main", 1).sym &&
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		find_sym(&temp_dso, "stdin", 1).sym) {
1874
		unmap_library(&temp_dso);
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		return load_library("libc.so", needed_by, namespace, true, reserved_params);
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
	}
	/* Past this point, if we haven't reached runtime yet, ldso has
	 * committed either to use the mapped library or to abort execution.
	 * Unmapping is not possible, so we can safely reclaim gaps. */
	if (!runtime) reclaim_gaps(&temp_dso);

	/* Allocate storage for the new DSO. When there is TLS, this
	 * storage must include a reservation for all pre-existing
	 * threads to obtain copies of both the new TLS, and an
	 * extended DTV capable of storing an additional slot for
	 * the newly-loaded DSO. */
	alloc_size = sizeof *p + strlen(pathname) + 1;
	if (runtime && temp_dso.tls.image) {
		size_t per_th = temp_dso.tls.size + temp_dso.tls.align
			+ sizeof(void *) * (tls_cnt+3);
		n_th = libc.threads_minus_1 + 1;
		if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX;
		else alloc_size += n_th * per_th;
	}
1895
	p = internal_calloc(1, alloc_size);
1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
	if (!p) {
		unmap_library(&temp_dso);
		return 0;
	}
	memcpy(p, &temp_dso, sizeof temp_dso);
	p->dev = st.st_dev;
	p->ino = st.st_ino;
	p->needed_by = needed_by;
	p->name = p->buf;
	p->runtime_loaded = runtime;
	strcpy(p->name, pathname);
	/* Add a shortname only if name arg was not an explicit pathname. */
	if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
	if (p->tls.image) {
		p->tls_id = ++tls_cnt;
		tls_align = MAXP2(tls_align, p->tls.align);
#ifdef TLS_ABOVE_TP
		p->tls.offset = tls_offset + ( (p->tls.align-1) &
			(-tls_offset + (uintptr_t)p->tls.image) );
		tls_offset = p->tls.offset + p->tls.size;
#else
		tls_offset += p->tls.size + p->tls.align - 1;
		tls_offset -= (tls_offset + (uintptr_t)p->tls.image)
			& (p->tls.align-1);
		p->tls.offset = tls_offset;
#endif
		p->new_dtv = (void *)(-sizeof(size_t) &
			(uintptr_t)(p->name+strlen(p->name)+sizeof(size_t)));
		p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1));
		if (tls_tail) tls_tail->next = &p->tls;
		else libc.tls_head = &p->tls;
		tls_tail = &p->tls;
	}

	tail->next = p;
	p->prev = tail;
	tail = p;

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	/* Add dso to namespace */
	p->namespace = namespace;
	ns_add_dso(namespace, p);
1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
	if (runtime)
		p->by_dlopen = 1;

	if (DL_FDPIC) makefuncdescs(p);

	if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base);

	return p;
}

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static void load_direct_deps(struct dso *p, ns_t *namespace, struct reserved_address_params *reserved_params)
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{
	size_t i, cnt=0;

	if (p->deps) return;
	/* For head, all preloads are direct pseudo-dependencies.
	 * Count and include them now to avoid realloc later. */
	if (p==head) for (struct dso *q=p->next; q; q=q->next)
		cnt++;
	for (i=0; p->dynv[i]; i+=2)
		if (p->dynv[i] == DT_NEEDED) cnt++;
	/* Use builtin buffer for apps with no external deps, to
	 * preserve property of no runtime failure paths. */
	p->deps = (p==head && cnt<2) ? builtin_deps :
1961
		internal_calloc(cnt+1, sizeof *p->deps);
1962 1963 1964 1965 1966 1967 1968 1969 1970
	if (!p->deps) {
		error("Error loading dependencies for %s", p->name);
		if (runtime) longjmp(*rtld_fail, 1);
	}
	cnt=0;
	if (p==head) for (struct dso *q=p->next; q; q=q->next)
		p->deps[cnt++] = q;
	for (i=0; p->dynv[i]; i+=2) {
		if (p->dynv[i] != DT_NEEDED) continue;
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		struct dso *dep = load_library(p->strings + p->dynv[i+1], p, namespace, true, reserved_params);
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		LD_LOGD("loading shared library %{public}s: (needed by %{public}s)", p->strings + p->dynv[i+1], p->name);
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		if (!dep) {
			error("Error loading shared library %s: %m (needed by %s)",
				p->strings + p->dynv[i+1], p->name);
			if (runtime) longjmp(*rtld_fail, 1);
			continue;
		}
		p->deps[cnt++] = dep;
	}
	p->deps[cnt] = 0;
	p->ndeps_direct = cnt;
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	for (i = 0; i < p->ndeps_direct; i++) {
		add_dso_parent(p->deps[i], p);
	}
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}

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static void load_deps(struct dso *p, struct reserved_address_params *reserved_params)
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{
	if (p->deps) return;
	for (; p; p=p->next)
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		load_direct_deps(p, p->namespace, reserved_params);
1993
}
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#endif
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static void extend_bfs_deps(struct dso *p)
{
	size_t i, j, cnt, ndeps_all;
	struct dso **tmp;

	/* Can't use realloc if the original p->deps was allocated at
	 * program entry and malloc has been replaced, or if it's
	 * the builtin non-allocated trivial main program deps array. */
	int no_realloc = (__malloc_replaced && !p->runtime_loaded)
		|| p->deps == builtin_deps;

	if (p->bfs_built) return;
	ndeps_all = p->ndeps_direct;

	/* Mark existing (direct) deps so they won't be duplicated. */
	for (i=0; p->deps[i]; i++)
		p->deps[i]->mark = 1;

	/* For each dependency already in the list, copy its list of direct
	 * dependencies to the list, excluding any items already in the
	 * list. Note that the list this loop iterates over will grow during
	 * the loop, but since duplicates are excluded, growth is bounded. */
	for (i=0; p->deps[i]; i++) {
		struct dso *dep = p->deps[i];
		for (j=cnt=0; j<dep->ndeps_direct; j++)
			if (!dep->deps[j]->mark) cnt++;
		tmp = no_realloc ? 
2023 2024
			internal_malloc(sizeof(*tmp) * (ndeps_all+cnt+1)) :
			internal_realloc(p->deps, sizeof(*tmp) * (ndeps_all+cnt+1));
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		if (!tmp) {
			error("Error recording dependencies for %s", p->name);
			if (runtime) longjmp(*rtld_fail, 1);
			continue;
		}
		if (no_realloc) {
			memcpy(tmp, p->deps, sizeof(*tmp) * (ndeps_all+1));
			no_realloc = 0;
		}
		p->deps = tmp;
		for (j=0; j<dep->ndeps_direct; j++) {
			if (dep->deps[j]->mark) continue;
			dep->deps[j]->mark = 1;
			p->deps[ndeps_all++] = dep->deps[j];
		}
		p->deps[ndeps_all] = 0;
	}
	p->bfs_built = 1;
	for (p=head; p; p=p->next)
		p->mark = 0;
}

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#ifndef LOAD_ORDER_RANDOMIZATION
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static void load_preload(char *s, ns_t *ns)
2049 2050 2051 2052 2053 2054 2055 2056
{
	int tmp;
	char *z;
	for (z=s; *z; s=z) {
		for (   ; *s && (isspace(*s) || *s==':'); s++);
		for (z=s; *z && !isspace(*z) && *z!=':'; z++);
		tmp = *z;
		*z = 0;
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		load_library(s, 0, ns, true, NULL);
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		*z = tmp;
	}
}
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#endif
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static void add_syms(struct dso *p)
{
	if (!p->syms_next && syms_tail != p) {
		syms_tail->syms_next = p;
		syms_tail = p;
	}
}

static void revert_syms(struct dso *old_tail)
{
	struct dso *p, *next;
	/* Chop off the tail of the list of dsos that participate in
	 * the global symbol table, reverting them to RTLD_LOCAL. */
	for (p=old_tail; p; p=next) {
		next = p->syms_next;
		p->syms_next = 0;
	}
	syms_tail = old_tail;
}

static void do_mips_relocs(struct dso *p, size_t *got)
{
	size_t i, j, rel[2];
	unsigned char *base = p->base;
	i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO);
	if (p==&ldso) {
		got += i;
	} else {
		while (i--) *got++ += (size_t)base;
	}
	j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM);
	i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO);
	Sym *sym = p->syms + j;
	rel[0] = (unsigned char *)got - base;
	for (i-=j; i; i--, sym++, rel[0]+=sizeof(size_t)) {
		rel[1] = R_INFO(sym-p->syms, R_MIPS_JUMP_SLOT);
		do_relocs(p, rel, sizeof rel, 2);
	}
}

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static uint8_t* sleb128_decoder(uint8_t* current, uint8_t* end, size_t* value)
{    
	size_t result = 0;
	static const size_t size = CHAR_BIT * sizeof(result);

	size_t shift = 0;
	uint8_t byte;

	do {
		if (current >= end) {
			a_crash();
		}

		byte = *current++;
		result |= ((size_t)(byte & 127) << shift);
		shift += 7;
	} while (byte & 128);

	if (shift < size && (byte & 64)) {
		result |= -((size_t)(1) << shift);
	}

	*value = result;
	
	return current;
}

static void do_android_relocs(struct dso *p, size_t dt_name, size_t dt_size)
{
	size_t android_rel_addr = 0, android_rel_size = 0;
	uint8_t *android_rel_curr, *android_rel_end;

	search_vec(p->dynv, &android_rel_addr, dt_name);
	search_vec(p->dynv, &android_rel_size, dt_size);

	if (!android_rel_addr || (android_rel_size < 4)) {
		return;
	}

	android_rel_curr = laddr(p, android_rel_addr);
	if (memcmp(android_rel_curr, "APS2", ANDROID_REL_SIGN_SIZE)) {
		return;
	}

	android_rel_curr += ANDROID_REL_SIGN_SIZE;
	android_rel_size -= ANDROID_REL_SIGN_SIZE;

	android_rel_end = android_rel_curr + android_rel_size;
	
	size_t relocs_num;
	size_t rel[3] = {0};

	android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &relocs_num);
	android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &rel[0]);

	for (size_t i = 0; i < relocs_num;) {

		size_t group_size, group_flags;

		android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &group_size);
		android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &group_flags);

		size_t group_r_offset_delta = 0;

		if (group_flags & RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG) {
			android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &group_r_offset_delta);
		}
		
		if (group_flags & RELOCATION_GROUPED_BY_INFO_FLAG) {
			android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &rel[1]);
		}

		const size_t addend_flags = group_flags & (RELOCATION_GROUP_HAS_ADDEND_FLAG | RELOCATION_GROUPED_BY_ADDEND_FLAG);

		if (addend_flags == RELOCATION_GROUP_HAS_ADDEND_FLAG) {
		} else if (addend_flags == (RELOCATION_GROUP_HAS_ADDEND_FLAG | RELOCATION_GROUPED_BY_ADDEND_FLAG)) {
			size_t addend;
			android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &addend);
			rel[2] += addend;
		} else {
			rel[2] = 0;
		}

		for (size_t j = 0; j < group_size; j++) {
			if (group_flags & RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG) {
				rel[0] += group_r_offset_delta;
			} else {
				size_t offset_detla;
				android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &offset_detla);

				rel[0] += offset_detla;
			}

			if ((group_flags & RELOCATION_GROUPED_BY_INFO_FLAG) == 0) {
				android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &rel[1]);
			}

			if (addend_flags == RELOCATION_GROUP_HAS_ADDEND_FLAG) {
				size_t addend;
				android_rel_curr = sleb128_decoder(android_rel_curr, android_rel_end, &addend);
				rel[2] += addend;
			}

			if (dt_name == DT_ANDROID_REL) {
				LD_LOGI("do_android_relocs REL %{public}x %{public}x", rel[0], rel[1]);
				do_relocs(p, rel, sizeof(size_t)*2, 2);
			} else {
				LD_LOGI("do_android_relocs RELA %{public}x %{public}x %{public}x", rel[0], rel[1], rel[2]);
				do_relocs(p, rel, sizeof(size_t)*3, 3);
			}
		}

		i += group_size;
	}
}

static void do_relr_relocs(struct dso *dso, size_t *relr, size_t relr_size)
{
	unsigned char *base = dso->base;
	size_t *reloc_addr;
	for (; relr_size; relr++, relr_size-=sizeof(size_t))
		if ((relr[0]&1) == 0) {
			reloc_addr = laddr(dso, relr[0]);
			*reloc_addr++ += (size_t)base;
		} else {
			int i = 0;
			for (size_t bitmap=relr[0]; (bitmap>>=1); i++)
				if (bitmap&1)
					reloc_addr[i] += (size_t)base;
			reloc_addr += 8*sizeof(size_t)-1;
		}
}

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static void reloc_all(struct dso *p, const dl_extinfo *extinfo)
2237
{
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	ssize_t relro_fd_offset = 0;
2239 2240 2241
	size_t dyn[DYN_CNT];
	for (; p; p=p->next) {
		if (p->relocated) continue;
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		if (p != &ldso) {
			add_can_search_so_list_in_dso(p, head);
		}
2245 2246 2247 2248 2249 2250 2251
		decode_vec(p->dynv, dyn, DYN_CNT);
		if (NEED_MIPS_GOT_RELOCS)
			do_mips_relocs(p, laddr(p, dyn[DT_PLTGOT]));
		do_relocs(p, laddr(p, dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
			2+(dyn[DT_PLTREL]==DT_RELA));
		do_relocs(p, laddr(p, dyn[DT_REL]), dyn[DT_RELSZ], 2);
		do_relocs(p, laddr(p, dyn[DT_RELA]), dyn[DT_RELASZ], 3);
2252 2253 2254 2255 2256
		if (!DL_FDPIC)
			do_relr_relocs(p, laddr(p, dyn[DT_RELR]), dyn[DT_RELRSZ]);

		do_android_relocs(p, DT_ANDROID_REL, DT_ANDROID_RELSZ);
		do_android_relocs(p, DT_ANDROID_RELA, DT_ANDROID_RELASZ);
2257 2258

		if (head != &ldso && p->relro_start != p->relro_end &&
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			mprotect(laddr(p, p->relro_start), p->relro_end-p->relro_start, PROT_READ)
			&& errno != ENOSYS) {
2261 2262 2263 2264
			error("Error relocating %s: RELRO protection failed: %m",
				p->name);
			if (runtime) longjmp(*rtld_fail, 1);
		}
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		/* Handle serializing/mapping the RELRO segment */
		handle_relro_sharing(p, extinfo, &relro_fd_offset);
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		p->relocated = 1;
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		free_reloc_can_search_dso(p);
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	}
}

static void kernel_mapped_dso(struct dso *p)
{
	size_t min_addr = -1, max_addr = 0, cnt;
	Phdr *ph = p->phdr;
	for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) {
		if (ph->p_type == PT_DYNAMIC) {
			p->dynv = laddr(p, ph->p_vaddr);
		} else if (ph->p_type == PT_GNU_RELRO) {
			p->relro_start = ph->p_vaddr & -PAGE_SIZE;
			p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
		} else if (ph->p_type == PT_GNU_STACK) {
			if (!runtime && ph->p_memsz > __default_stacksize) {
				__default_stacksize =
					ph->p_memsz < DEFAULT_STACK_MAX ?
					ph->p_memsz : DEFAULT_STACK_MAX;
			}
		}
		if (ph->p_type != PT_LOAD) continue;
		if (ph->p_vaddr < min_addr)
			min_addr = ph->p_vaddr;
		if (ph->p_vaddr+ph->p_memsz > max_addr)
			max_addr = ph->p_vaddr+ph->p_memsz;
	}
	min_addr &= -PAGE_SIZE;
	max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
	p->map = p->base + min_addr;
	p->map_len = max_addr - min_addr;
	p->kernel_mapped = 1;
}

void __libc_exit_fini()
{
	struct dso *p;
	size_t dyn[DYN_CNT];
	int self = __pthread_self()->tid;

	/* Take both locks before setting shutting_down, so that
	 * either lock is sufficient to read its value. The lock
	 * order matches that in dlopen to avoid deadlock. */
	pthread_rwlock_wrlock(&lock);
	pthread_mutex_lock(&init_fini_lock);
	shutting_down = 1;
	pthread_rwlock_unlock(&lock);
	for (p=fini_head; p; p=p->fini_next) {
		while (p->ctor_visitor && p->ctor_visitor!=self)
			pthread_cond_wait(&ctor_cond, &init_fini_lock);
		if (!p->constructed) continue;
		decode_vec(p->dynv, dyn, DYN_CNT);
		if (dyn[0] & (1<<DT_FINI_ARRAY)) {
			size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t);
			size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY])+n;
			while (n--) ((void (*)(void))*--fn)();
		}
#ifndef NO_LEGACY_INITFINI
		if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI])
			fpaddr(p, dyn[DT_FINI])();
#endif
	}
}

static struct dso **queue_ctors(struct dso *dso)
{
	size_t cnt, qpos, spos, i;
	struct dso *p, **queue, **stack;

	if (ldd_mode) return 0;

	/* Bound on queue size is the total number of indirect deps.
	 * If a bfs deps list was built, we can use it. Otherwise,
	 * bound by the total number of DSOs, which is always safe and
	 * is reasonable we use it (for main app at startup). */
	if (dso->bfs_built) {
		for (cnt=0; dso->deps[cnt]; cnt++)
			dso->deps[cnt]->mark = 0;
		cnt++; /* self, not included in deps */
	} else {
		for (cnt=0, p=head; p; cnt++, p=p->next)
			p->mark = 0;
	}
	cnt++; /* termination slot */
	if (dso==head && cnt <= countof(builtin_ctor_queue))
		queue = builtin_ctor_queue;
	else
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		queue = internal_calloc(cnt, sizeof *queue);
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	if (!queue) {
		error("Error allocating constructor queue: %m\n");
		if (runtime) longjmp(*rtld_fail, 1);
		return 0;
	}

	/* Opposite ends of the allocated buffer serve as an output queue
	 * and a working stack. Setup initial stack with just the argument
	 * dso and initial queue empty... */
	stack = queue;
	qpos = 0;
	spos = cnt;
	stack[--spos] = dso;
	dso->next_dep = 0;
	dso->mark = 1;

	/* Then perform pseudo-DFS sort, but ignoring circular deps. */
	while (spos<cnt) {
		p = stack[spos++];
		while (p->next_dep < p->ndeps_direct) {
			if (p->deps[p->next_dep]->mark) {
				p->next_dep++;
			} else {
				stack[--spos] = p;
				p = p->deps[p->next_dep];
				p->next_dep = 0;
				p->mark = 1;
			}
		}
		queue[qpos++] = p;
	}
	queue[qpos] = 0;
	for (i=0; i<qpos; i++) queue[i]->mark = 0;

	return queue;
}

static void do_init_fini(struct dso **queue)
{
	struct dso *p;
	size_t dyn[DYN_CNT], i;
	int self = __pthread_self()->tid;

	pthread_mutex_lock(&init_fini_lock);
	for (i=0; (p=queue[i]); i++) {
		while ((p->ctor_visitor && p->ctor_visitor!=self) || shutting_down)
			pthread_cond_wait(&ctor_cond, &init_fini_lock);
		if (p->ctor_visitor || p->constructed)
			continue;
		p->ctor_visitor = self;
		
		decode_vec(p->dynv, dyn, DYN_CNT);
		if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) {
			p->fini_next = fini_head;
			fini_head = p;
		}

		pthread_mutex_unlock(&init_fini_lock);

#ifndef NO_LEGACY_INITFINI
		if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
			fpaddr(p, dyn[DT_INIT])();
#endif
		if (dyn[0] & (1<<DT_INIT_ARRAY)) {
			size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t);
			size_t *fn = laddr(p, dyn[DT_INIT_ARRAY]);
			while (n--) ((void (*)(void))*fn++)();
		}

		pthread_mutex_lock(&init_fini_lock);
		p->ctor_visitor = 0;
		p->constructed = 1;
		pthread_cond_broadcast(&ctor_cond);
	}
	pthread_mutex_unlock(&init_fini_lock);
}

void __libc_start_init(void)
{
	do_init_fini(main_ctor_queue);
	if (!__malloc_replaced && main_ctor_queue != builtin_ctor_queue)
2439
		internal_free(main_ctor_queue);
2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550
	main_ctor_queue = 0;
}

static void dl_debug_state(void)
{
}

weak_alias(dl_debug_state, _dl_debug_state);

void __init_tls(size_t *auxv)
{
}

static void update_tls_size()
{
	libc.tls_cnt = tls_cnt;
	libc.tls_align = tls_align;
	libc.tls_size = ALIGN(
		(1+tls_cnt) * sizeof(void *) +
		tls_offset +
		sizeof(struct pthread) +
		tls_align * 2,
	tls_align);
}

static void install_new_tls(void)
{
	sigset_t set;
	pthread_t self = __pthread_self(), td;
	struct dso *dtv_provider = container_of(tls_tail, struct dso, tls);
	uintptr_t (*newdtv)[tls_cnt+1] = (void *)dtv_provider->new_dtv;
	struct dso *p;
	size_t i, j;
	size_t old_cnt = self->dtv[0];

	__block_app_sigs(&set);
	__tl_lock();
	/* Copy existing dtv contents from all existing threads. */
	for (i=0, td=self; !i || td!=self; i++, td=td->next) {
		memcpy(newdtv+i, td->dtv,
			(old_cnt+1)*sizeof(uintptr_t));
		newdtv[i][0] = tls_cnt;
	}
	/* Install new dtls into the enlarged, uninstalled dtv copies. */
	for (p=head; ; p=p->next) {
		if (p->tls_id <= old_cnt) continue;
		unsigned char *mem = p->new_tls;
		for (j=0; j<i; j++) {
			unsigned char *new = mem;
			new += ((uintptr_t)p->tls.image - (uintptr_t)mem)
				& (p->tls.align-1);
			memcpy(new, p->tls.image, p->tls.len);
			newdtv[j][p->tls_id] =
				(uintptr_t)new + DTP_OFFSET;
			mem += p->tls.size + p->tls.align;
		}
		if (p->tls_id == tls_cnt) break;
	}

	/* Broadcast barrier to ensure contents of new dtv is visible
	 * if the new dtv pointer is. The __membarrier function has a
	 * fallback emulation using signals for kernels that lack the
	 * feature at the syscall level. */

	__membarrier(MEMBARRIER_CMD_PRIVATE_EXPEDITED, 0);

	/* Install new dtv for each thread. */
	for (j=0, td=self; !j || td!=self; j++, td=td->next) {
		td->dtv = td->dtv_copy = newdtv[j];
	}

	__tl_unlock();
	__restore_sigs(&set);
}

/* Stage 1 of the dynamic linker is defined in dlstart.c. It calls the
 * following stage 2 and stage 3 functions via primitive symbolic lookup
 * since it does not have access to their addresses to begin with. */

/* Stage 2 of the dynamic linker is called after relative relocations 
 * have been processed. It can make function calls to static functions
 * and access string literals and static data, but cannot use extern
 * symbols. Its job is to perform symbolic relocations on the dynamic
 * linker itself, but some of the relocations performed may need to be
 * replaced later due to copy relocations in the main program. */

hidden void __dls2(unsigned char *base, size_t *sp)
{
	size_t *auxv;
	for (auxv=sp+1+*sp+1; *auxv; auxv++);
	auxv++;
	if (DL_FDPIC) {
		void *p1 = (void *)sp[-2];
		void *p2 = (void *)sp[-1];
		if (!p1) {
			size_t aux[AUX_CNT];
			decode_vec(auxv, aux, AUX_CNT);
			if (aux[AT_BASE]) ldso.base = (void *)aux[AT_BASE];
			else ldso.base = (void *)(aux[AT_PHDR] & -4096);
		}
		app_loadmap = p2 ? p1 : 0;
		ldso.loadmap = p2 ? p2 : p1;
		ldso.base = laddr(&ldso, 0);
	} else {
		ldso.base = base;
	}
	Ehdr *ehdr = (void *)ldso.base;
	ldso.name = ldso.shortname = "libc.so";
	ldso.phnum = ehdr->e_phnum;
	ldso.phdr = laddr(&ldso, ehdr->e_phoff);
	ldso.phentsize = ehdr->e_phentsize;
2551
	ldso.is_global = true;
2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573
	kernel_mapped_dso(&ldso);
	decode_dyn(&ldso);

	if (DL_FDPIC) makefuncdescs(&ldso);

	/* Prepare storage for to save clobbered REL addends so they
	 * can be reused in stage 3. There should be very few. If
	 * something goes wrong and there are a huge number, abort
	 * instead of risking stack overflow. */
	size_t dyn[DYN_CNT];
	decode_vec(ldso.dynv, dyn, DYN_CNT);
	size_t *rel = laddr(&ldso, dyn[DT_REL]);
	size_t rel_size = dyn[DT_RELSZ];
	size_t symbolic_rel_cnt = 0;
	apply_addends_to = rel;
	for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t))
		if (!IS_RELATIVE(rel[1], ldso.syms)) symbolic_rel_cnt++;
	if (symbolic_rel_cnt >= ADDEND_LIMIT) a_crash();
	size_t addends[symbolic_rel_cnt+1];
	saved_addends = addends;

	head = &ldso;
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	reloc_all(&ldso, NULL);
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	ldso.relocated = 0;

	/* Call dynamic linker stage-2b, __dls2b, looking it up
	 * symbolically as a barrier against moving the address
	 * load across the above relocation processing. */
	struct symdef dls2b_def = find_sym(&ldso, "__dls2b", 0);
	if (DL_FDPIC) ((stage3_func)&ldso.funcdescs[dls2b_def.sym-ldso.syms])(sp, auxv);
	else ((stage3_func)laddr(&ldso, dls2b_def.sym->st_value))(sp, auxv);
}

/* Stage 2b sets up a valid thread pointer, which requires relocations
 * completed in stage 2, and on which stage 3 is permitted to depend.
 * This is done as a separate stage, with symbolic lookup as a barrier,
 * so that loads of the thread pointer and &errno can be pure/const and
 * thereby hoistable. */

void __dls2b(size_t *sp, size_t *auxv)
{
	/* Setup early thread pointer in builtin_tls for ldso/libc itself to
	 * use during dynamic linking. If possible it will also serve as the
	 * thread pointer at runtime. */
	search_vec(auxv, &__hwcap, AT_HWCAP);
	libc.auxv = auxv;
	libc.tls_size = sizeof builtin_tls;
	libc.tls_align = tls_align;
	if (__init_tp(__copy_tls((void *)builtin_tls)) < 0) {
		a_crash();
	}

	struct symdef dls3_def = find_sym(&ldso, "__dls3", 0);
	if (DL_FDPIC) ((stage3_func)&ldso.funcdescs[dls3_def.sym-ldso.syms])(sp, auxv);
	else ((stage3_func)laddr(&ldso, dls3_def.sym->st_value))(sp, auxv);
}

/* Stage 3 of the dynamic linker is called with the dynamic linker/libc
 * fully functional. Its job is to load (if not already loaded) and
 * process dependencies and relocations for the main application and
 * transfer control to its entry point. */

void __dls3(size_t *sp, size_t *auxv)
{
	static struct dso app, vdso;
	size_t aux[AUX_CNT];
	size_t i;
	char *env_preload=0;
	char *replace_argv0=0;
	size_t vdso_base;
	int argc = *sp;
	char **argv = (void *)(sp+1);
	char **argv_orig = argv;
	char **envp = argv+argc+1;

	/* Find aux vector just past environ[] and use it to initialize
	 * global data that may be needed before we can make syscalls. */
	__environ = envp;
	decode_vec(auxv, aux, AUX_CNT);
	search_vec(auxv, &__sysinfo, AT_SYSINFO);
	__pthread_self()->sysinfo = __sysinfo;
	libc.page_size = aux[AT_PAGESZ];
	libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
		|| aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]);

	/* Only trust user/env if kernel says we're not suid/sgid */
	if (!libc.secure) {
		env_path = getenv("LD_LIBRARY_PATH");
		env_preload = getenv("LD_PRELOAD");
	}
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#ifdef OHOS_ENABLE_PARAMETER
	InitParameterClient();
#endif
2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671
	/* If the main program was already loaded by the kernel,
	 * AT_PHDR will point to some location other than the dynamic
	 * linker's program headers. */
	if (aux[AT_PHDR] != (size_t)ldso.phdr) {
		size_t interp_off = 0;
		size_t tls_image = 0;
		/* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
		Phdr *phdr = app.phdr = (void *)aux[AT_PHDR];
		app.phnum = aux[AT_PHNUM];
		app.phentsize = aux[AT_PHENT];
		for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
			if (phdr->p_type == PT_PHDR)
				app.base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
			else if (phdr->p_type == PT_INTERP)
				interp_off = (size_t)phdr->p_vaddr;
			else if (phdr->p_type == PT_TLS) {
				tls_image = phdr->p_vaddr;
				app.tls.len = phdr->p_filesz;
				app.tls.size = phdr->p_memsz;
				app.tls.align = phdr->p_align;
			}
		}
		if (DL_FDPIC) app.loadmap = app_loadmap;
		if (app.tls.size) app.tls.image = laddr(&app, tls_image);
		if (interp_off) ldso.name = laddr(&app, interp_off);
		if ((aux[0] & (1UL<<AT_EXECFN))
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			&& strncmp((char *)aux[AT_EXECFN], "/proc/", 6))
2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720
			app.name = (char *)aux[AT_EXECFN];
		else
			app.name = argv[0];
		kernel_mapped_dso(&app);
	} else {
		int fd;
		char *ldname = argv[0];
		size_t l = strlen(ldname);
		if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
		argv++;
		while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') {
			char *opt = argv[0]+2;
			*argv++ = (void *)-1;
			if (!*opt) {
				break;
			} else if (!memcmp(opt, "list", 5)) {
				ldd_mode = 1;
			} else if (!memcmp(opt, "library-path", 12)) {
				if (opt[12]=='=') env_path = opt+13;
				else if (opt[12]) *argv = 0;
				else if (*argv) env_path = *argv++;
			} else if (!memcmp(opt, "preload", 7)) {
				if (opt[7]=='=') env_preload = opt+8;
				else if (opt[7]) *argv = 0;
				else if (*argv) env_preload = *argv++;
			} else if (!memcmp(opt, "argv0", 5)) {
				if (opt[5]=='=') replace_argv0 = opt+6;
				else if (opt[5]) *argv = 0;
				else if (*argv) replace_argv0 = *argv++;
			} else {
				argv[0] = 0;
			}
		}
		argv[-1] = (void *)(argc - (argv-argv_orig));
		if (!argv[0]) {
			dprintf(2, "musl libc (" LDSO_ARCH ")\n"
				"Version %s\n"
				"Dynamic Program Loader\n"
				"Usage: %s [options] [--] pathname%s\n",
				__libc_version, ldname,
				ldd_mode ? "" : " [args]");
			_exit(1);
		}
		fd = open(argv[0], O_RDONLY);
		if (fd < 0) {
			dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
			_exit(1);
		}
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		Ehdr *ehdr = (void *)map_library(fd, &app, NULL);
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767
		if (!ehdr) {
			dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
			_exit(1);
		}
		close(fd);
		ldso.name = ldname;
		app.name = argv[0];
		aux[AT_ENTRY] = (size_t)laddr(&app, ehdr->e_entry);
		/* Find the name that would have been used for the dynamic
		 * linker had ldd not taken its place. */
		if (ldd_mode) {
			for (i=0; i<app.phnum; i++) {
				if (app.phdr[i].p_type == PT_INTERP)
					ldso.name = laddr(&app, app.phdr[i].p_vaddr);
			}
			dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base);
		}
	}
	if (app.tls.size) {
		libc.tls_head = tls_tail = &app.tls;
		app.tls_id = tls_cnt = 1;
#ifdef TLS_ABOVE_TP
		app.tls.offset = GAP_ABOVE_TP;
		app.tls.offset += (-GAP_ABOVE_TP + (uintptr_t)app.tls.image)
			& (app.tls.align-1);
		tls_offset = app.tls.offset + app.tls.size;
#else
		tls_offset = app.tls.offset = app.tls.size
			+ ( -((uintptr_t)app.tls.image + app.tls.size)
			& (app.tls.align-1) );
#endif
		tls_align = MAXP2(tls_align, app.tls.align);
	}
	decode_dyn(&app);
	if (DL_FDPIC) {
		makefuncdescs(&app);
		if (!app.loadmap) {
			app.loadmap = (void *)&app_dummy_loadmap;
			app.loadmap->nsegs = 1;
			app.loadmap->segs[0].addr = (size_t)app.map;
			app.loadmap->segs[0].p_vaddr = (size_t)app.map
				- (size_t)app.base;
			app.loadmap->segs[0].p_memsz = app.map_len;
		}
		argv[-3] = (void *)app.loadmap;
	}
2768
	app.is_global = true;
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778

	/* Initial dso chain consists only of the app. */
	head = tail = syms_tail = &app;

	/* Donate unused parts of app and library mapping to malloc */
	reclaim_gaps(&app);
	reclaim_gaps(&ldso);

	/* Load preload/needed libraries, add symbols to global namespace. */
	ldso.deps = (struct dso **)no_deps;
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	/* Init g_is_asan */
	g_is_asan = false;
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	LD_LOGD("__dls3 ldso.name:%{public}s.", ldso.name);
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	/* Through ldso Name to judge whether the Asan function is enabled */
	if (strstr(ldso.name, "-asan")) {
		g_is_asan = true;
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		LD_LOGD("__dls3 g_is_asan is true.");
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	}
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	/* Init all namespaces by config file. there is a default namespace always*/
	init_namespace(&app);
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#ifdef LOAD_ORDER_RANDOMIZATION
	struct loadtasks *tasks = create_loadtasks();
	if (!tasks) {
		_exit(1);
	}
	if (env_preload) {
		load_preload(env_preload, get_default_ns(), tasks);
	}
2798 2799 2800
	for (struct dso *q=head; q; q=q->next) {
		q->is_global = true;
	}
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	preload_deps(&app, tasks);
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	unmap_preloaded_sections(tasks);
	shuffle_loadtasks(tasks);
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	run_loadtasks(tasks, NULL);
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	free_loadtasks(tasks);
	assign_tls(app.next);
#else
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	if (env_preload) load_preload(env_preload, get_default_ns());
2809 2810 2811
	for (struct dso *q=head; q; q=q->next) {
		q->is_global = true;
	}
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 	load_deps(&app, NULL);
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#endif

2815 2816 2817
	/* Set is_reloc_head_so_dep to true for all direct and indirect dependent sos of app, including app self. */
	for (struct dso *p=head; p; p=p->next) {
		p->is_reloc_head_so_dep = true;
2818
		add_syms(p);
2819
	}
2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841

	/* Attach to vdso, if provided by the kernel, last so that it does
	 * not become part of the global namespace.  */
	if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR) && vdso_base) {
		Ehdr *ehdr = (void *)vdso_base;
		Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff);
		vdso.phnum = ehdr->e_phnum;
		vdso.phentsize = ehdr->e_phentsize;
		for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
			if (phdr->p_type == PT_DYNAMIC)
				vdso.dynv = (void *)(vdso_base + phdr->p_offset);
			if (phdr->p_type == PT_LOAD)
				vdso.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
		}
		vdso.name = "";
		vdso.shortname = "linux-gate.so.1";
		vdso.relocated = 1;
		vdso.deps = (struct dso **)no_deps;
		decode_dyn(&vdso);
		vdso.prev = tail;
		tail->next = &vdso;
		tail = &vdso;
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		vdso.namespace = get_default_ns();
		ns_add_dso(vdso.namespace, &vdso);
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867
	}

	for (i=0; app.dynv[i]; i+=2) {
		if (!DT_DEBUG_INDIRECT && app.dynv[i]==DT_DEBUG)
			app.dynv[i+1] = (size_t)&debug;
		if (DT_DEBUG_INDIRECT && app.dynv[i]==DT_DEBUG_INDIRECT) {
			size_t *ptr = (size_t *) app.dynv[i+1];
			*ptr = (size_t)&debug;
		}
	}

	/* This must be done before final relocations, since it calls
	 * malloc, which may be provided by the application. Calling any
	 * application code prior to the jump to its entry point is not
	 * valid in our model and does not work with FDPIC, where there
	 * are additional relocation-like fixups that only the entry point
	 * code can see to perform. */
	main_ctor_queue = queue_ctors(&app);

	/* Initial TLS must also be allocated before final relocations
	 * might result in calloc being a call to application code. */
	update_tls_size();
	void *initial_tls = builtin_tls;
	if (libc.tls_size > sizeof builtin_tls || tls_align > MIN_TLS_ALIGN) {
2868
		initial_tls = internal_calloc(libc.tls_size, 1);
2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
		if (!initial_tls) {
			dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
				argv[0], libc.tls_size);
			_exit(127);
		}
	}
	static_tls_cnt = tls_cnt;

	/* The main program must be relocated LAST since it may contain
	 * copy relocations which depend on libraries' relocations. */
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	reloc_all(app.next, NULL);
	reloc_all(&app, NULL);
2881 2882 2883
	for (struct dso *q=head; q; q=q->next) {
		q->is_reloc_head_so_dep = false;
	}
2884 2885 2886 2887

	/* Actual copying to new TLS needs to happen after relocations,
	 * since the TLS images might have contained relocated addresses. */
	if (initial_tls != builtin_tls) {
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		pthread_t self = __pthread_self();
		pthread_t td = __copy_tls(initial_tls);
		if (__init_tp(td) < 0) {
2891 2892
			a_crash();
		}
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		td->tsd = self->tsd;
2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922
	} else {
		size_t tmp_tls_size = libc.tls_size;
		pthread_t self = __pthread_self();
		/* Temporarily set the tls size to the full size of
		 * builtin_tls so that __copy_tls will use the same layout
		 * as it did for before. Then check, just to be safe. */
		libc.tls_size = sizeof builtin_tls;
		if (__copy_tls((void*)builtin_tls) != self) a_crash();
		libc.tls_size = tmp_tls_size;
	}

	if (ldso_fail) _exit(127);
	if (ldd_mode) _exit(0);

	/* Determine if malloc was interposed by a replacement implementation
	 * so that calloc and the memalign family can harden against the
	 * possibility of incomplete replacement. */
	if (find_sym(head, "malloc", 1).dso != &ldso)
		__malloc_replaced = 1;

	/* Switch to runtime mode: any further failures in the dynamic
	 * linker are a reportable failure rather than a fatal startup
	 * error. */
	runtime = 1;

	debug.ver = 1;
	debug.bp = dl_debug_state;
	debug.head = head;
	debug.base = ldso.base;
2923
	debug.state = RT_CONSISTENT;
2924 2925 2926 2927
	_dl_debug_state();

	if (replace_argv0) argv[0] = replace_argv0;

Z
zengchunliang 已提交
2928 2929 2930
#ifdef DFX_SIGNAL_LIBC
	DFX_InstallSignalHandler();
#endif
2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949
	errno = 0;

	CRTJMP((void *)aux[AT_ENTRY], argv-1);
	for(;;);
}

static void prepare_lazy(struct dso *p)
{
	size_t dyn[DYN_CNT], n, flags1=0;
	decode_vec(p->dynv, dyn, DYN_CNT);
	search_vec(p->dynv, &flags1, DT_FLAGS_1);
	if (dyn[DT_BIND_NOW] || (dyn[DT_FLAGS] & DF_BIND_NOW) || (flags1 & DF_1_NOW))
		return;
	n = dyn[DT_RELSZ]/2 + dyn[DT_RELASZ]/3 + dyn[DT_PLTRELSZ]/2 + 1;
	if (NEED_MIPS_GOT_RELOCS) {
		size_t j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM);
		size_t i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO);
		n += i-j;
	}
2950
	p->lazy = internal_calloc(n, 3*sizeof(size_t));
2951 2952 2953 2954 2955 2956 2957 2958
	if (!p->lazy) {
		error("Error preparing lazy relocation for %s: %m", p->name);
		longjmp(*rtld_fail, 1);
	}
	p->lazy_next = lazy_head;
	lazy_head = p;
}

2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987
static void *dlopen_post(struct dso* p, int mode) {
	if (p == NULL) {
		return p;
	}

	p->nr_dlopen++;
	if (p->bfs_built) {
		for (int i = 0; p->deps[i]; i++) {
			p->deps[i]->nr_dlopen++;

			if (mode & RTLD_NODELETE) {
				p->deps[i]->flags |= DSO_FLAGS_NODELETE;
			}
		}
	}

#ifdef HANDLE_RANDOMIZATION
	void *handle = assign_valid_handle(p);
	if (handle == NULL) {
		LD_LOGE("dlopen_post: generate random handle failed");
		do_dlclose(p);
	}

	return handle;
#endif

	return p;
}

Y
yangwenjun 已提交
2988
/* add namespace function */
2989
static void *dlopen_impl(
W
wangjiahui 已提交
2990
	const char *file, int mode, const char *namespace, const void *caller_addr, const dl_extinfo *extinfo)
2991 2992 2993 2994 2995 2996 2997 2998
{
	struct dso *volatile p, *orig_tail, *orig_syms_tail, *orig_lazy_head, *next;
	struct tls_module *orig_tls_tail;
	size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
	size_t i;
	int cs;
	jmp_buf jb;
	struct dso **volatile ctor_queue = 0;
Y
yangwenjun 已提交
2999 3000
	ns_t *ns;
	struct dso *caller;
W
wangjiahui 已提交
3001 3002 3003
	bool reserved_address = false;
	bool reserved_address_recursive = false;
	struct reserved_address_params reserved_params = {0};
W
wangjiahui 已提交
3004 3005 3006
#ifdef LOAD_ORDER_RANDOMIZATION
	struct loadtasks *tasks = NULL;
	struct loadtask *task = NULL;
3007
	bool is_task_appended = false;
W
wangjiahui 已提交
3008
#endif
3009

W
wangjiahui 已提交
3010
	if (!file) {
3011 3012
		LD_LOGD("dlopen_impl file is null, return head.");
		return dlopen_post(head, mode);
W
wangjiahui 已提交
3013
	}
3014

W
wangjiahui 已提交
3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031
	if (extinfo) {
		reserved_address_recursive = extinfo->flag & DL_EXT_RESERVED_ADDRESS_RECURSIVE;
		if (extinfo->flag & DL_EXT_RESERVED_ADDRESS) {
			reserved_address = true;
			reserved_params.start_addr = extinfo->reserved_addr;
			reserved_params.reserved_size = extinfo->reserved_size;
			reserved_params.must_use_reserved = true;
			reserved_params.reserved_address_recursive = reserved_address_recursive;
		} else if (extinfo->flag & DL_EXT_RESERVED_ADDRESS_HINT) {
			reserved_address = true;
			reserved_params.start_addr = extinfo->reserved_addr;
			reserved_params.reserved_size = extinfo->reserved_size;
			reserved_params.must_use_reserved = false;
			reserved_params.reserved_address_recursive = reserved_address_recursive;
		}
	}

3032 3033 3034
	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
	pthread_rwlock_wrlock(&lock);
	__inhibit_ptc();
W
wangjiahui 已提交
3035

3036 3037
	debug.state = RT_ADD;
	_dl_debug_state();
Y
yangwenjun 已提交
3038 3039 3040 3041 3042
	/* When namespace does not exist, use caller's namespce
	 * and when caller does not exist, use default namespce. */
	caller = (struct dso *)addr2dso((size_t)caller_addr);
	ns = find_ns_by_name(namespace);
	if (!ns) ns = ((caller && caller->namespace) ? caller->namespace : get_default_ns());
3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065

	p = 0;
	if (shutting_down) {
		error("Cannot dlopen while program is exiting.");
		goto end;
	}
	orig_tls_tail = tls_tail;
	orig_tls_cnt = tls_cnt;
	orig_tls_offset = tls_offset;
	orig_tls_align = tls_align;
	orig_lazy_head = lazy_head;
	orig_syms_tail = syms_tail;
	orig_tail = tail;
	noload = mode & RTLD_NOLOAD;

	rtld_fail = &jb;
	if (setjmp(*rtld_fail)) {
		/* Clean up anything new that was (partially) loaded */
		revert_syms(orig_syms_tail);
		for (p=orig_tail->next; p; p=next) {
			next = p->next;
			while (p->td_index) {
				void *tmp = p->td_index->next;
3066
				internal_free(p->td_index);
3067 3068
				p->td_index = tmp;
			}
3069
			internal_free(p->funcdescs);
3070
			if (p->rpath != p->rpath_orig)
3071
				internal_free(p->rpath);
G
ganlan 已提交
3072 3073 3074 3075 3076
			if (p->deps) {
				for (int i = 0; i < p->ndeps_direct; i++) {
					remove_dso_parent(p->deps[i], p);
				}
			}
3077
			internal_free(p->deps);
Y
yangwenjun 已提交
3078
			dlclose_ns(p);
3079
			unmap_library(p);
G
ganlan 已提交
3080 3081 3082
			if (p->parents) {
				internal_free(p->parents);
			}
Y
yinchuang 已提交
3083
			free_reloc_can_search_dso(p);
3084
			internal_free(p);
3085
		}
3086
		internal_free(ctor_queue);
3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098
		ctor_queue = 0;
		if (!orig_tls_tail) libc.tls_head = 0;
		tls_tail = orig_tls_tail;
		if (tls_tail) tls_tail->next = 0;
		tls_cnt = orig_tls_cnt;
		tls_offset = orig_tls_offset;
		tls_align = orig_tls_align;
		lazy_head = orig_lazy_head;
		tail = orig_tail;
		tail->next = 0;
		p = 0;
		goto end;
W
wangjiahui 已提交
3099 3100 3101 3102
	} else {
#ifdef LOAD_ORDER_RANDOMIZATION
		tasks = create_loadtasks();
		if (!tasks) {
3103
			LD_LOGE("dlopen_impl create loadtasks failed");
W
wangjiahui 已提交
3104 3105 3106 3107
			goto end;
		}
		task = create_loadtask(file, head, ns, true);
		if (!task) {
3108
			LD_LOGE("dlopen_impl create loadtask failed");
W
wangjiahui 已提交
3109 3110 3111
			goto end;
		}
		if (!load_library_header(task)) {
M
maweiye 已提交
3112 3113 3114 3115
			error(noload ?
				"Library %s is not already loaded" :
				"Error loading shared library %s: %m",
				file);
3116
			LD_LOGE("dlopen_impl load library header failed for %{public}s", task->name);
W
wangjiahui 已提交
3117 3118
			goto end;
		}
W
wangjiahui 已提交
3119
		if (reserved_address) {
3120
			reserved_params.target = task->p;
W
wangjiahui 已提交
3121
		}
W
wangjiahui 已提交
3122
	}
3123
	if (!task->p) {
3124
		LD_LOGE("dlopen_impl load library failed for %{public}s", task->name);
3125 3126 3127 3128 3129 3130
		error(noload ?
			"Library %s is not already loaded" :
			"Error loading shared library %s: %m",
			file);
		goto end;
	}
W
wangjiahui 已提交
3131
	if (!task->isloaded) {
3132
		is_task_appended = append_loadtasks(tasks, task);
W
wangjiahui 已提交
3133
	}
G
ganlan 已提交
3134
	preload_deps(task->p, tasks);
W
wangjiahui 已提交
3135 3136 3137 3138
	unmap_preloaded_sections(tasks);
	if (!reserved_address_recursive) {
		shuffle_loadtasks(tasks);
	}
W
wangjiahui 已提交
3139
	run_loadtasks(tasks, reserved_address ? &reserved_params : NULL);
3140
	p = task->p;
W
wangjiahui 已提交
3141 3142
	if (!task->isloaded) {
		assign_tls(p);
3143 3144
	}
	if (!is_task_appended) {
W
wangjiahui 已提交
3145 3146 3147 3148 3149 3150
		free_task(task);
		task = NULL;
	}
	free_loadtasks(tasks);
	tasks = NULL;
#else
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160
		p = load_library(file, head, ns, true, reserved_address ? &reserved_params : NULL);
	}

	if (!p) {
		error(noload ?
			"Library %s is not already loaded" :
			"Error loading shared library %s: %m",
			file);
		goto end;
	}
3161
	/* First load handling */
G
ganlan 已提交
3162
	load_deps(p, reserved_address && reserved_address_recursive ? &reserved_params : NULL);
W
wangjiahui 已提交
3163
#endif
3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177
	extend_bfs_deps(p);
	pthread_mutex_lock(&init_fini_lock);
	if (!p->constructed) ctor_queue = queue_ctors(p);
	pthread_mutex_unlock(&init_fini_lock);
	if (!p->relocated && (mode & RTLD_LAZY)) {
		prepare_lazy(p);
		for (i=0; p->deps[i]; i++)
			if (!p->deps[i]->relocated)
				prepare_lazy(p->deps[i]);
	}
	if (!p->relocated || (mode & RTLD_GLOBAL)) {
		/* Make new symbols global, at least temporarily, so we can do
		 * relocations. If not RTLD_GLOBAL, this is reverted below. */
		add_syms(p);
3178 3179 3180 3181
		/* Set is_reloc_head_so_dep to true for all direct and indirect dependent sos of p, including p self. */
		p->is_reloc_head_so_dep = true;
		for (i=0; p->deps[i]; i++) {
			p->deps[i]->is_reloc_head_so_dep = true;
3182
			add_syms(p->deps[i]);
3183
		}
3184
	}
3185
	struct dso *reloc_head_so = p;
3186
	if (!p->relocated) {
W
wangjiahui 已提交
3187
		reloc_all(p, extinfo);
3188
	}
3189 3190 3191 3192
	reloc_head_so->is_reloc_head_so_dep = false;
	for (size_t i=0; reloc_head_so->deps[i]; i++) {
		reloc_head_so->deps[i]->is_reloc_head_so_dep = false;
	}
3193 3194 3195

	/* If RTLD_GLOBAL was not specified, undo any new additions
	 * to the global symbol table. This is a nop if the library was
3196 3197
	 * previously loaded and already global. */
	if (!(mode & RTLD_GLOBAL))
3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
		revert_syms(orig_syms_tail);

	/* Processing of deferred lazy relocations must not happen until
	 * the new libraries are committed; otherwise we could end up with
	 * relocations resolved to symbol definitions that get removed. */
	redo_lazy_relocs();

	if (mode & RTLD_NODELETE) {
		p->flags |= DSO_FLAGS_NODELETE;
	}

	update_tls_size();
	if (tls_cnt != orig_tls_cnt)
		install_new_tls();
	orig_tail = tail;
3213 3214

	p = dlopen_post(p, mode);
3215
end:
3216 3217
	debug.state = RT_CONSISTENT;
	_dl_debug_state();
W
wangjiahui 已提交
3218
#ifdef LOAD_ORDER_RANDOMIZATION
3219 3220 3221
	if (!is_task_appended) {
		free_task(task);
	}
W
wangjiahui 已提交
3222 3223
	free_loadtasks(tasks);
#endif
3224 3225 3226 3227 3228
	__release_ptc();
	if (p) gencnt++;
	pthread_rwlock_unlock(&lock);
	if (ctor_queue) {
		do_init_fini(ctor_queue);
3229
		internal_free(ctor_queue);
3230 3231
	}
	pthread_setcancelstate(cs, 0);
D
dhy308 已提交
3232 3233 3234
	return p;
}

Y
yangwenjun 已提交
3235 3236 3237
void *dlopen(const char *file, int mode)
{
	const void *caller_addr = __builtin_return_address(0);
3238 3239
	musl_log_reset();
	ld_log_reset();
G
ganlan 已提交
3240
	LD_LOGI("dlopen file:%{public}s, mode:%{public}x ,caller_addr:%{public}p .", file, mode, caller_addr);
W
wangjiahui 已提交
3241
	return dlopen_impl(file, mode, NULL, caller_addr, NULL);
Y
yangwenjun 已提交
3242 3243 3244 3245
}

void dlns_init(Dl_namespace *dlns, const char *name)
{
W
wangjiahui 已提交
3246
	if (!dlns) {
G
ganlan 已提交
3247
		LD_LOGE("dlns_init dlns is null.");
W
wangjiahui 已提交
3248 3249
		return;
	}
Y
yangwenjun 已提交
3250
	if (!name) {
G
ganlan 已提交
3251
		LD_LOGE("dlns_init name is null.");
Y
yangwenjun 已提交
3252 3253 3254 3255
		dlns->name[0] = 0;
		return;
	}
	snprintf(dlns->name, sizeof dlns->name, name);
G
ganlan 已提交
3256
	LD_LOGI("dlns_init dlns->name:%{public}s .", dlns->name);
Y
yangwenjun 已提交
3257 3258
}

W
wangjiahui 已提交
3259 3260 3261
int dlns_get(const char *name, Dl_namespace *dlns)
{
	if (!dlns) {
G
ganlan 已提交
3262
		LD_LOGE("dlns_get dlns is null.");
W
wangjiahui 已提交
3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273
		return EINVAL;
	}
	int ret = 0;
	ns_t *ns = NULL;
	pthread_rwlock_rdlock(&lock);
	if (!name) {
		struct dso *caller;
		const void *caller_addr = __builtin_return_address(0);
		caller = (struct dso *)addr2dso((size_t)caller_addr);
		ns = ((caller && caller->namespace) ? caller->namespace : get_default_ns());
		(void)snprintf(dlns->name, sizeof dlns->name, ns->ns_name);
G
ganlan 已提交
3274
		LD_LOGI("dlns_get name is null, current dlns dlns->name:%{public}s.", dlns->name);
W
wangjiahui 已提交
3275 3276 3277 3278
	} else {
		ns = find_ns_by_name(name);
		if (ns) {
			(void)snprintf(dlns->name, sizeof dlns->name, ns->ns_name);
G
ganlan 已提交
3279
			LD_LOGI("dlns_get found ns, current dlns dlns->name:%{public}s.", dlns->name);
W
wangjiahui 已提交
3280
		} else {
G
ganlan 已提交
3281
			LD_LOGI("dlns_get not found ns! name:%{public}s.", name);
W
wangjiahui 已提交
3282 3283 3284 3285 3286 3287 3288
			ret = ENOKEY;
		}
	}
	pthread_rwlock_unlock(&lock);
	return ret;
}

Y
yangwenjun 已提交
3289 3290 3291
void *dlopen_ns(Dl_namespace *dlns, const char *file, int mode)
{
	const void *caller_addr = __builtin_return_address(0);
3292 3293
	musl_log_reset();
	ld_log_reset();
G
ganlan 已提交
3294 3295 3296 3297
	LD_LOGI("dlopen_ns file:%{public}s, mode:%{public}x , caller_addr:%{public}p , dlns->name:%{public}s.",
		file,
		mode,
		caller_addr,
3298
		dlns ? dlns->name : "NULL");
G
ganlan 已提交
3299
	return dlopen_impl(file, mode, dlns->name, caller_addr, NULL);
Y
yangwenjun 已提交
3300 3301
}

X
XUBO 已提交
3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316
void *dlopen_ns_ext(Dl_namespace *dlns, const char *file, int mode, const dl_extinfo *extinfo)
{
	const void *caller_addr = __builtin_return_address(0);
	musl_log_reset();
	ld_log_reset();
	LD_LOGI("dlopen_ns_ext file:%{public}s, mode:%{public}x , caller_addr:%{public}p , "
			"dlns->name:%{public}s. , extinfo->flag:%{public}x",
		file,
		mode,
		caller_addr,
		dlns->name,
		extinfo ? extinfo->flag : 0);
	return dlopen_impl(file, mode, dlns->name, caller_addr, extinfo);
}

W
wangjiahui 已提交
3317
int dlns_create2(Dl_namespace *dlns, const char *lib_path, int flags)
Y
yangwenjun 已提交
3318
{
W
wangjiahui 已提交
3319
	if (!dlns) {
G
ganlan 已提交
3320
		LD_LOGE("dlns_create2 dlns is null.");
W
wangjiahui 已提交
3321 3322
		return EINVAL;
	}
Y
yangwenjun 已提交
3323 3324 3325 3326 3327
	ns_t *ns;

	pthread_rwlock_wrlock(&lock);
	ns = find_ns_by_name(dlns->name);
	if (ns) {
G
ganlan 已提交
3328
		LD_LOGE("dlns_create2 ns is exist.");
Y
yangwenjun 已提交
3329 3330 3331 3332 3333
		pthread_rwlock_unlock(&lock);
		return EEXIST;
	}
	ns = ns_alloc();
	if (!ns) {
G
ganlan 已提交
3334
		LD_LOGE("dlns_create2 no memery.");
Y
yangwenjun 已提交
3335 3336 3337 3338 3339 3340 3341
		pthread_rwlock_unlock(&lock);
		return ENOMEM;
	}
	ns_set_name(ns, dlns->name);
	ns_add_dso(ns, get_default_ns()->ns_dsos->dsos[0]); /* add main app to this namespace*/
	nslist_add_ns(ns); /* add ns to list*/
	ns_set_lib_paths(ns, lib_path);
W
wangjiahui 已提交
3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355

	if ((flags & CREATE_INHERIT_DEFAULT) != 0) {
		ns_add_inherit(ns, get_default_ns(), NULL);
	}

	if ((flags & CREATE_INHERIT_CURRENT) != 0) {
		struct dso *caller;
		const void *caller_addr = __builtin_return_address(0);
		caller = (struct dso *)addr2dso((size_t)caller_addr);
		if (caller && caller->namespace) {
			ns_add_inherit(ns, caller->namespace, NULL);
		}
	}

G
ganlan 已提交
3356 3357 3358 3359
	LD_LOGI("dlns_create2:"
			"ns_name: %{public}s ,"
			"separated:%{public}d ,"
			"lib_paths:%{public}s ",
G
ganlan 已提交
3360
			ns->ns_name, ns->separated, ns->lib_paths);
Y
yangwenjun 已提交
3361 3362 3363 3364 3365
	pthread_rwlock_unlock(&lock);

	return 0;
}

W
wangjiahui 已提交
3366 3367
int dlns_create(Dl_namespace *dlns, const char *lib_path)
{
G
ganlan 已提交
3368
	LD_LOGI("dlns_create lib_paths:%{public}s", lib_path);
W
wangjiahui 已提交
3369 3370 3371
	return dlns_create2(dlns, lib_path, CREATE_INHERIT_DEFAULT);
}

Y
yangwenjun 已提交
3372 3373
int dlns_inherit(Dl_namespace *dlns, Dl_namespace *inherited, const char *shared_libs)
{
W
wangjiahui 已提交
3374
	if (!dlns || !inherited) {
G
ganlan 已提交
3375
		LD_LOGE("dlns_inherit dlns or inherited is null.");
W
wangjiahui 已提交
3376 3377
		return EINVAL;
	}
Y
yangwenjun 已提交
3378 3379 3380 3381 3382

	pthread_rwlock_wrlock(&lock);
	ns_t* ns = find_ns_by_name(dlns->name);
	ns_t* ns_inherited = find_ns_by_name(inherited->name);
	if (!ns || !ns_inherited) {
G
ganlan 已提交
3383
		LD_LOGE("dlns_inherit ns or ns_inherited is not found.");
Y
yangwenjun 已提交
3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408
		pthread_rwlock_unlock(&lock);
		return ENOKEY;
	}
	ns_add_inherit(ns, ns_inherited, shared_libs);
	pthread_rwlock_unlock(&lock);

	return 0;
}

static void dlclose_ns(struct dso *p)
{
	if (!p) return;
	ns_t * ns = p->namespace;
	if (!ns||!ns->ns_dsos) return;
	for (size_t i=0; i<ns->ns_dsos->num; i++) {
		if (p == ns->ns_dsos->dsos[i]) {
			for (size_t j=i+1; j<ns->ns_dsos->num; j++) {
				ns->ns_dsos->dsos[j-1] = ns->ns_dsos->dsos[j];
			}
			ns->ns_dsos->num--;
			return;
		}
	}
}

3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429
hidden int __dl_invalid_handle(void *h)
{
	struct dso *p;
	for (p=head; p; p=p->next) if (h==p) return 0;
	error("Invalid library handle %p", (void *)h);
	return 1;
}

static void *addr2dso(size_t a)
{
	struct dso *p;
	size_t i;
	if (DL_FDPIC) for (p=head; p; p=p->next) {
		i = count_syms(p);
		if (a-(size_t)p->funcdescs < i*sizeof(*p->funcdescs))
			return p;
	}
	for (p=head; p; p=p->next) {
		if (DL_FDPIC && p->loadmap) {
			for (i=0; i<p->loadmap->nsegs; i++) {
				if (a-p->loadmap->segs[i].p_vaddr
W
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					< p->loadmap->segs[i].p_memsz)
3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449
					return p;
			}
		} else {
			Phdr *ph = p->phdr;
			size_t phcnt = p->phnum;
			size_t entsz = p->phentsize;
			size_t base = (size_t)p->base;
			for (; phcnt--; ph=(void *)((char *)ph+entsz)) {
				if (ph->p_type != PT_LOAD) continue;
				if (a-base-ph->p_vaddr < ph->p_memsz)
					return p;
			}
			if (a-(size_t)p->map < p->map_len)
				return 0;
		}
	}
	return 0;
}

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static void *do_dlsym(struct dso *p, const char *s, const char *v, void *ra)
3451 3452
{
	int use_deps = 0;
G
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3453 3454 3455
	bool ra2dso = false;
	ns_t *ns = NULL;
	struct dso *caller = NULL;
3456 3457
	if (p == head || p == RTLD_DEFAULT) {
		p = head;
G
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3458
		ra2dso = true;
3459 3460 3461 3462
	} else if (p == RTLD_NEXT) {
		p = addr2dso((size_t)ra);
		if (!p) p=head;
		p = p->next;
G
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3463
		ra2dso = true;
3464
#ifndef HANDLE_RANDOMIZATION
3465 3466
	} else if (__dl_invalid_handle(p)) {
		return 0;
3467
#endif
G
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3468
	} else {
3469
		use_deps = 1;
G
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3470 3471 3472 3473 3474 3475 3476 3477
		ns = p->namespace;
	}
	if (ra2dso) {
		caller = (struct dso *)addr2dso((size_t)ra);
		if (caller && caller->namespace) {
			ns = caller->namespace;
		}
	}
G
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	struct verinfo verinfo = { .s = s, .v = v, .use_vna_hash = false };
G
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3479
	struct symdef def = find_sym2(p, &verinfo, 0, use_deps, ns);
3480
	if (!def.sym) {
3481
		LD_LOGE("do_dlsym failed: symbol not found. so=%{public}s s=%{public}s v=%{public}s", p->name, s, v);
G
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3482
		error("Symbol not found: %s, version: %s", s, strlen(v) > 0 ? v : "null");
3483 3484 3485 3486 3487 3488 3489 3490 3491
		return 0;
	}
	if ((def.sym->st_info&0xf) == STT_TLS)
		return __tls_get_addr((tls_mod_off_t []){def.dso->tls_id, def.sym->st_value-DTP_OFFSET});
	if (DL_FDPIC && (def.sym->st_info&0xf) == STT_FUNC)
		return def.dso->funcdescs + (def.sym - def.dso->syms);
	return laddr(def.dso, def.sym->st_value);
}

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static int dlclose_impl(struct dso *p)
3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509
{
	size_t n;
	struct dso *d;

	if (__dl_invalid_handle(p))
		return -1;

	if (!p->by_dlopen) {
		error("Library %s is not loaded by dlopen", p->name);
		return -1;
	}

	/* dso is marked  as RTLD_NODELETE library, do nothing here. */
	if ((p->flags & DSO_FLAGS_NODELETE) != 0) {
		return 0;
	}

D
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	if (--(p->nr_dlopen) > 0)
3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555
		return 0;

	/* call destructors if needed */
	if (p->constructed) {
		size_t dyn[DYN_CNT];
		decode_vec(p->dynv, dyn, DYN_CNT);
		if (dyn[0] & (1<<DT_FINI_ARRAY)) {
			n = dyn[DT_FINI_ARRAYSZ] / sizeof(size_t);
			size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY]) + n;
			while (n--)
				((void (*)(void))*--fn)();
		}
		p->constructed = 0;
	}

	/* remove dso symbols from global list */
	if (p->syms_next) {
		for (d = head; d->syms_next != p; d = d->syms_next)
			; /* NOP */
		d->syms_next = p->syms_next;
	} else if (p == syms_tail) {
		for (d = head; d->syms_next != p; d = d->syms_next)
			; /* NOP */
		d->syms_next = NULL;
		syms_tail = d;
	}

	/* remove dso from lazy list if needed */
	if (p == lazy_head) {
		lazy_head = p->lazy_next;
	} else if (p->lazy_next) {
		for (d = lazy_head; d->lazy_next != p; d = d->lazy_next)
			; /* NOP */
		d->lazy_next = p->lazy_next;
	}

	/* remove dso from fini list */
	if (p == fini_head) {
		fini_head = p->fini_next;
	} else if (p->fini_next) {
		for (d = fini_head; d->fini_next != p; d = d->fini_next)
			; /* NOP */
		d->fini_next = p->fini_next;
	}

D
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3556 3557 3558 3559 3560
	/* empty tls image */
	if (p->tls.size != 0) {
		p->tls.image = NULL;
	}

3561 3562 3563 3564 3565 3566 3567 3568 3569
	/* remove dso from global dso list */
	if (p == tail) {
		tail = p->prev;
		tail->next = NULL;
	} else {
		p->next->prev = p->prev;
		p->prev->next = p->next;
	}

Y
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3570 3571 3572
	/* remove dso from namespace */
	dlclose_ns(p);
	
3573
	if (p->lazy != NULL)
3574
		internal_free(p->lazy);
G
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3575 3576 3577 3578 3579
	if (p->deps) {
		for (int i = 0; i < p->ndeps_direct; i++) {
			remove_dso_parent(p->deps[i], p);
		}
	}
3580
	if (p->deps != no_deps)
3581
		internal_free(p->deps);
3582
	unmap_library(p);
D
dhy308 已提交
3583

G
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3584 3585 3586
	if (p->parents) {
		internal_free(p->parents);
	}
3587

Y
yinchuang 已提交
3588
	free_reloc_can_search_dso(p);
D
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3589 3590 3591
	if (p->tls.size == 0) {
		internal_free(p);
	}
3592 3593 3594 3595

	return 0;
}

D
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3596 3597
static char* dlclose_deps_black_list[] =
{
D
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3598
	"/system/lib/libhidebug.so",
D
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3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618
	"/system/lib64/libhidebug.so", 
	"/system/lib64/libmsdp_neardetect_algorithm.z.so", 
	"/vendor/lib64/libhril_hdf.z.so"
};

static int do_dlclose(struct dso *p)
{
	bool ldclose_deps = true;

	for (int i = 0; i < sizeof(dlclose_deps_black_list)/sizeof(char*); i++) {
		if (!strcmp(dlclose_deps_black_list[i], p->name)) {
			ldclose_deps = false;
			break;
		}
	}

	size_t deps_num;

	for (deps_num = 0; p->deps[deps_num]; deps_num++);

D
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3619
	struct dso **deps_bak = internal_malloc(deps_num*sizeof(struct dso*));
D
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3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633
	if (deps_bak != NULL) {
		memcpy(deps_bak, p->deps, deps_num*sizeof(struct dso*));
	}

	LD_LOGI("do_dlclose name=%{public}s count=%{public}d by_dlopen=%{public}d", p->name, p->nr_dlopen, p->by_dlopen);	
	dlclose_impl(p);

	if (ldclose_deps) {
		for (size_t i = 0; i < deps_num; i++) {
			LD_LOGI("do_dlclose name=%{public}s count=%{public}d by_dlopen=%{public}d", deps_bak[i]->name, deps_bak[i]->nr_dlopen, deps_bak[i]->by_dlopen);
			dlclose_impl(deps_bak[i]);
		}
	}

D
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3634 3635 3636
	internal_free(deps_bak);

	return 0;
D
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3637 3638
}

3639 3640 3641 3642 3643
hidden int __dlclose(void *p)
{
	int rc;
	pthread_rwlock_wrlock(&lock);
	__inhibit_ptc();
W
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3644 3645 3646
#ifdef HANDLE_RANDOMIZATION
	struct dso *dso = find_dso_by_handle(p);
	if (dso == NULL) {
G
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3647 3648 3649
		errno = EINVAL;
		error("Handle is invalid.");
		LD_LOGE("Handle is not find.");
W
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3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664
		__release_ptc();
		pthread_rwlock_unlock(&lock);
		return -1;
	}
	rc = do_dlclose(dso);
	if (!rc) {
		struct dso *t = head;
		for (; t && t != dso; t = t->next) {
			;
		}
		if (t == NULL) {
			remove_handle_node(p);
		}
	}
#else
3665
	rc = do_dlclose(p);
W
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3666
#endif
3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742
	__release_ptc();
	pthread_rwlock_unlock(&lock);
	return rc;
}

int dladdr(const void *addr_arg, Dl_info *info)
{
	size_t addr = (size_t)addr_arg;
	struct dso *p;
	Sym *sym, *bestsym;
	uint32_t nsym;
	char *strings;
	size_t best = 0;
	size_t besterr = -1;

	pthread_rwlock_rdlock(&lock);
	p = addr2dso(addr);
	pthread_rwlock_unlock(&lock);

	if (!p) return 0;

	sym = p->syms;
	strings = p->strings;
	nsym = count_syms(p);

	if (DL_FDPIC) {
		size_t idx = (addr-(size_t)p->funcdescs)
			/ sizeof(*p->funcdescs);
		if (idx < nsym && (sym[idx].st_info&0xf) == STT_FUNC) {
			best = (size_t)(p->funcdescs + idx);
			bestsym = sym + idx;
			besterr = 0;
		}
	}

	if (!best) for (; nsym; nsym--, sym++) {
		if (sym->st_value
		 && (1<<(sym->st_info&0xf) & OK_TYPES)
		 && (1<<(sym->st_info>>4) & OK_BINDS)) {
			size_t symaddr = (size_t)laddr(p, sym->st_value);
			if (symaddr > addr || symaddr <= best)
				continue;
			best = symaddr;
			bestsym = sym;
			besterr = addr - symaddr;
			if (addr == symaddr)
				break;
		}
	}

	if (best && besterr > bestsym->st_size-1) {
		best = 0;
		bestsym = 0;
	}

	info->dli_fname = p->name;
	info->dli_fbase = p->map;

	if (!best) {
		info->dli_sname = 0;
		info->dli_saddr = 0;
		return 1;
	}

	if (DL_FDPIC && (bestsym->st_info&0xf) == STT_FUNC)
		best = (size_t)(p->funcdescs + (bestsym - p->syms));
	info->dli_sname = strings + bestsym->st_name;
	info->dli_saddr = (void *)best;

	return 1;
}

hidden void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
{
	void *res;
	pthread_rwlock_rdlock(&lock);
W
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3743
#ifdef HANDLE_RANDOMIZATION
W
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3744 3745 3746 3747 3748 3749
	if ((p != RTLD_DEFAULT) && (p != RTLD_NEXT)) {
		struct dso *dso = find_dso_by_handle(p);
		if (dso == NULL) {
			pthread_rwlock_unlock(&lock);
			return 0;
		}
G
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3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772
		res = do_dlsym(dso, s, "", ra);
	} else {
		res = do_dlsym(p, s, "", ra);
	}
#else
	res = do_dlsym(p, s, "", ra);
#endif
	pthread_rwlock_unlock(&lock);
	return res;
}

hidden void *__dlvsym(void *restrict p, const char *restrict s, const char *restrict v, void *restrict ra)
{
	void *res;
	pthread_rwlock_rdlock(&lock);
#ifdef HANDLE_RANDOMIZATION
	if ((p != RTLD_DEFAULT) && (p != RTLD_NEXT)) {
		struct dso *dso = find_dso_by_handle(p);
		if (dso == NULL) {
			pthread_rwlock_unlock(&lock);
			return 0;
		}
		res = do_dlsym(dso, s, v, ra);
W
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3773
	} else {
G
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3774
		res = do_dlsym(p, s, v, ra);
W
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3775 3776
	}
#else
G
ganlan 已提交
3777
	res = do_dlsym(p, s, v, ra);
W
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3778
#endif
3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849
	pthread_rwlock_unlock(&lock);
	return res;
}

hidden void *__dlsym_redir_time64(void *restrict p, const char *restrict s, void *restrict ra)
{
#if _REDIR_TIME64
	const char *suffix, *suffix2 = "";
	char redir[36];

	/* Map the symbol name to a time64 version of itself according to the
	 * pattern used for naming the redirected time64 symbols. */
	size_t l = strnlen(s, sizeof redir);
	if (l<4 || l==sizeof redir) goto no_redir;
	if (s[l-2]=='_' && s[l-1]=='r') {
		l -= 2;
		suffix2 = s+l;
	}
	if (l<4) goto no_redir;
	if (!strcmp(s+l-4, "time")) suffix = "64";
	else suffix = "_time64";

	/* Use the presence of the remapped symbol name in libc to determine
	 * whether it's one that requires time64 redirection; replace if so. */
	snprintf(redir, sizeof redir, "__%.*s%s%s", (int)l, s, suffix, suffix2);
	if (find_sym(&ldso, redir, 1).sym) s = redir;
no_redir:
#endif
	return __dlsym(p, s, ra);
}

int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
{
	struct dso *current;
	struct dl_phdr_info info;
	int ret = 0;
	for(current = head; current;) {
		info.dlpi_addr      = (uintptr_t)current->base;
		info.dlpi_name      = current->name;
		info.dlpi_phdr      = current->phdr;
		info.dlpi_phnum     = current->phnum;
		info.dlpi_adds      = gencnt;
		info.dlpi_subs      = 0;
		info.dlpi_tls_modid = current->tls_id;
		info.dlpi_tls_data  = current->tls.image;

		ret = (callback)(&info, sizeof (info), data);

		if (ret != 0) break;

		pthread_rwlock_rdlock(&lock);
		current = current->next;
		pthread_rwlock_unlock(&lock);
	}
	return ret;
}

static void error(const char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	if (!runtime) {
		vdprintf(2, fmt, ap);
		dprintf(2, "\n");
		ldso_fail = 1;
		va_end(ap);
		return;
	}
	__dl_vseterr(fmt, ap);
	va_end(ap);
}
W
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3850 3851 3852 3853

int dlns_set_namespace_lib_path(const char * name, const char * lib_path)
{
	if (!name || !lib_path) {
G
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3854
		LD_LOGE("dlns_set_namespace_lib_path name or lib_path is null.");
W
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3855 3856 3857 3858 3859 3860 3861
		return EINVAL;
	}

	pthread_rwlock_wrlock(&lock);
	ns_t* ns = find_ns_by_name(name);
	if (!ns) {
		pthread_rwlock_unlock(&lock);
G
ganlan 已提交
3862
		LD_LOGE("dlns_set_namespace_lib_path fail, input ns name : [%{public}s] is not found.", name);
W
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3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873
		return ENOKEY;
	}

	ns_set_lib_paths(ns, lib_path);
	pthread_rwlock_unlock(&lock);
	return 0;
}

int dlns_set_namespace_separated(const char * name, const bool separated)
{
	if (!name) {
G
ganlan 已提交
3874
		LD_LOGE("dlns_set_namespace_separated name  is null.");
W
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3875 3876 3877 3878 3879 3880 3881
		return EINVAL;
	}

	pthread_rwlock_wrlock(&lock);
	ns_t* ns = find_ns_by_name(name);
	if (!ns) {
		pthread_rwlock_unlock(&lock);
G
ganlan 已提交
3882
		LD_LOGE("dlns_set_namespace_separated fail, input ns name : [%{public}s] is not found.", name);
W
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3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893
		return ENOKEY;
	}

	ns_set_separated(ns, separated);
	pthread_rwlock_unlock(&lock);
	return 0;
}

int dlns_set_namespace_permitted_paths(const char * name, const char * permitted_paths)
{
	if (!name || !permitted_paths) {
G
ganlan 已提交
3894
		LD_LOGE("dlns_set_namespace_permitted_paths name or permitted_paths is null.");
W
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3895 3896 3897 3898 3899 3900 3901
		return EINVAL;
	}

	pthread_rwlock_wrlock(&lock);
	ns_t* ns = find_ns_by_name(name);
	if (!ns) {
		pthread_rwlock_unlock(&lock);
G
ganlan 已提交
3902
		LD_LOGE("dlns_set_namespace_permitted_paths fail, input ns name : [%{public}s] is not found.", name);
W
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3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913
		return ENOKEY;
	}

	ns_set_permitted_paths(ns, permitted_paths);
	pthread_rwlock_unlock(&lock);
	return 0;
}

int dlns_set_namespace_allowed_libs(const char * name, const char * allowed_libs)
{
	if (!name || !allowed_libs) {
G
ganlan 已提交
3914
		LD_LOGE("dlns_set_namespace_allowed_libs name or allowed_libs is null.");
W
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3915 3916 3917 3918 3919 3920 3921
		return EINVAL;
	}

	pthread_rwlock_wrlock(&lock);
	ns_t* ns = find_ns_by_name(name);
	if (!ns) {
		pthread_rwlock_unlock(&lock);
G
ganlan 已提交
3922
		LD_LOGE("dlns_set_namespace_allowed_libs fail, input ns name : [%{public}s] is not found.", name);
W
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3923 3924 3925 3926 3927 3928 3929 3930
		return ENOKEY;
	}

	ns_set_allowed_libs(ns, allowed_libs);
	pthread_rwlock_unlock(&lock);
	return 0;
}

W
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3931
int handle_asan_path_open(int fd, const char *name, ns_t *namespace, char *buf, size_t buf_size)
W
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3932
{
G
ganlan 已提交
3933
	LD_LOGD("handle_asan_path_open fd:%{public}d, name:%{public}s , namespace:%{public}s .",
G
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3934 3935
		fd,
		name,
G
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3936
		namespace ? namespace->ns_name : "NULL");
G
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3937
	int fd_tmp = fd;
W
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3938 3939 3940
	if (fd == -1 && (namespace->asan_lib_paths || namespace->lib_paths)) {
		if (namespace->lib_paths && namespace->asan_lib_paths) {
			size_t newlen = strlen(namespace->asan_lib_paths) + strlen(namespace->lib_paths) + 2;
3941
			char *new_lib_paths = internal_malloc(newlen);
W
wangjiahui 已提交
3942 3943 3944 3945
			memset(new_lib_paths, 0, newlen);
			strcpy(new_lib_paths, namespace->asan_lib_paths);
			strcat(new_lib_paths, ":");
			strcat(new_lib_paths, namespace->lib_paths);
W
wangjiahui 已提交
3946
			fd_tmp = path_open(name, new_lib_paths, buf, buf_size);
G
ganlan 已提交
3947
			LD_LOGD("handle_asan_path_open path_open new_lib_paths:%{public}s ,fd: %{public}d.", new_lib_paths, fd_tmp);
3948
			internal_free(new_lib_paths);
W
wangjiahui 已提交
3949
		} else if (namespace->asan_lib_paths) {
W
wangjiahui 已提交
3950
			fd_tmp = path_open(name, namespace->asan_lib_paths, buf, buf_size);
G
ganlan 已提交
3951 3952 3953 3954
			LD_LOGD("handle_asan_path_open path_open asan_lib_paths:%{public}s ,fd: %{public}d.",
				namespace->asan_lib_paths,
				fd_tmp);
		} else {
W
wangjiahui 已提交
3955
			fd_tmp = path_open(name, namespace->lib_paths, buf, buf_size);
G
ganlan 已提交
3956 3957 3958
			LD_LOGD(
				"handle_asan_path_open path_open lib_paths:%{public}s ,fd: %{public}d.", namespace->lib_paths, fd_tmp);
		}
W
wangjiahui 已提交
3959 3960 3961
	}
	return fd_tmp;
}
W
wangjiahui 已提交
3962 3963 3964

void* dlopen_ext(const char *file, int mode, const dl_extinfo *extinfo)
{
3965 3966 3967
	const void *caller_addr = __builtin_return_address(0);
	musl_log_reset();
	ld_log_reset();
W
wangjiahui 已提交
3968 3969
	if (extinfo != NULL) {
		if ((extinfo->flag & ~(DL_EXT_VALID_FLAG_BITS)) != 0) {
G
ganlan 已提交
3970
			LD_LOGE("Error dlopen_ext %{public}s: invalid flag %{public}x", file, extinfo->flag);
W
wangjiahui 已提交
3971 3972 3973
			return NULL;
		}
	}
G
ganlan 已提交
3974
	LD_LOGI("dlopen_ext file:%{public}s, mode:%{public}x , caller_addr:%{public}p , extinfo->flag:%{public}x",
G
ganlan 已提交
3975 3976 3977 3978
		file,
		mode,
		caller_addr,
		extinfo ? extinfo->flag : 0);
W
wangjiahui 已提交
3979 3980 3981 3982 3983 3984 3985 3986 3987 3988
  	return dlopen_impl(file, mode, NULL, caller_addr, extinfo);
}

#ifdef LOAD_ORDER_RANDOMIZATION
static bool map_library_header(struct loadtask *task)
{
	off_t off_start;
	Phdr *ph;
	size_t i;

3989
	ssize_t l = pread(task->fd, task->ehdr_buf, sizeof task->ehdr_buf, task->file_offset);
W
wangjiahui 已提交
3990 3991
	task->eh = task->ehdr_buf;
	if (l < 0) {
G
ganlan 已提交
3992
		LD_LOGE("Error mapping header %{public}s: failed to read fd", task->name);
W
wangjiahui 已提交
3993 3994 3995
		return false;
	}
	if (l < sizeof(Ehdr) || (task->eh->e_type != ET_DYN && task->eh->e_type != ET_EXEC)) {
G
ganlan 已提交
3996
		LD_LOGE("Error mapping header %{public}s: invaliled Ehdr", task->name);
W
wangjiahui 已提交
3997 3998 3999 4000
		goto noexec;
	}
	task->phsize = task->eh->e_phentsize * task->eh->e_phnum;
	if (task->phsize > sizeof task->ehdr_buf - sizeof(Ehdr)) {
4001
		task->allocated_buf = internal_malloc(task->phsize);
W
wangjiahui 已提交
4002
		if (!task->allocated_buf) {
G
ganlan 已提交
4003
			LD_LOGE("Error mapping header %{public}s: failed to alloc memory", task->name);
W
wangjiahui 已提交
4004 4005
			return false;
		}
4006
		l = pread(task->fd, task->allocated_buf, task->phsize, task->eh->e_phoff + task->file_offset);
W
wangjiahui 已提交
4007
		if (l < 0) {
G
ganlan 已提交
4008
			LD_LOGE("Error mapping header %{public}s: failed to pread", task->name);
W
wangjiahui 已提交
4009 4010 4011
			goto error;
		}
		if (l != task->phsize) {
G
ganlan 已提交
4012
			LD_LOGE("Error mapping header %{public}s: unmatched phsize", task->name);
W
wangjiahui 已提交
4013 4014 4015 4016
			goto noexec;
		}
		ph = task->ph0 = task->allocated_buf;
	} else if (task->eh->e_phoff + task->phsize > l) {
4017
		l = pread(task->fd, task->ehdr_buf + 1, task->phsize, task->eh->e_phoff + task->file_offset);
W
wangjiahui 已提交
4018
		if (l < 0) {
G
ganlan 已提交
4019
			LD_LOGE("Error mapping header %{public}s: failed to pread", task->name);
W
wangjiahui 已提交
4020 4021 4022
			goto error;
		}
		if (l != task->phsize) {
G
ganlan 已提交
4023
			LD_LOGE("Error mapping header %{public}s: unmatched phsize", task->name);
W
wangjiahui 已提交
4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046
			goto noexec;
		}
		ph = task->ph0 = (void *)(task->ehdr_buf + 1);
	} else {
		ph = task->ph0 = (void *)((char *)task->ehdr_buf + task->eh->e_phoff);
	}
	for (i = task->eh->e_phnum; i; i--, ph = (void *)((char *)ph + task->eh->e_phentsize)) {
		if (ph->p_type == PT_DYNAMIC) {
			task->dyn = ph->p_vaddr;
		} else if (ph->p_type == PT_TLS) {
			task->tls_image = ph->p_vaddr;
			task->tls.align = ph->p_align;
			task->tls.len = ph->p_filesz;
			task->tls.size = ph->p_memsz;
		}

		if (ph->p_type != PT_DYNAMIC) {
			continue;
		}
		// map the dynamic segment and the string table of the library
		off_start = ph->p_offset;
		off_start &= -PAGE_SIZE;
		task->dyn_map_len = ph->p_memsz + (ph->p_offset - off_start);
4047 4048 4049 4050
		/* The default value of file_offset is 0.
		 * The value of file_offset may be greater than 0 when opening library from zip file.
		 * The value of file_offset ensures PAGE_SIZE aligned. */
		task->dyn_map = mmap(0, task->dyn_map_len, PROT_READ, MAP_PRIVATE, task->fd, off_start + task->file_offset);
W
wangjiahui 已提交
4051
		if (task->dyn_map == MAP_FAILED) {
G
ganlan 已提交
4052
			LD_LOGE("Error mapping header %{public}s: failed to map dynamic section", task->name);
W
wangjiahui 已提交
4053 4054 4055 4056 4057 4058 4059 4060 4061
			goto error;
		}
		task->dyn_addr = (size_t *)((unsigned char *)task->dyn_map + (ph->p_offset - off_start));
		size_t dyn_tmp;
		off_t str_table;
		size_t str_size;
		if (search_vec(task->dyn_addr, &dyn_tmp, DT_STRTAB)) {
			str_table = dyn_tmp;
		} else {
G
ganlan 已提交
4062
			LD_LOGE("Error mapping header %{public}s: DT_STRTAB not found", task->name);
W
wangjiahui 已提交
4063 4064 4065 4066 4067
			goto error;
		}
		if (search_vec(task->dyn_addr, &dyn_tmp, DT_STRSZ)) {
			str_size = dyn_tmp;
		} else {
G
ganlan 已提交
4068
			LD_LOGE("Error mapping header %{public}s: DT_STRSZ not found", task->name);
W
wangjiahui 已提交
4069 4070 4071 4072 4073
			goto error;
		}
		off_start = str_table;
		off_start &= -PAGE_SIZE;
		task->str_map_len = str_size + (str_table - off_start);
4074
		task->str_map = mmap(0, task->str_map_len, PROT_READ, MAP_PRIVATE, task->fd, off_start + task->file_offset);
W
wangjiahui 已提交
4075
		if (task->str_map == MAP_FAILED) {
G
ganlan 已提交
4076
			LD_LOGE("Error mapping header %{public}s: failed to map string section", task->name);
W
wangjiahui 已提交
4077 4078 4079 4080 4081
			goto error;
		}
		task->str_addr = (char *)task->str_map + str_table - off_start;
	}
	if (!task->dyn) {
G
ganlan 已提交
4082
		LD_LOGE("Error mapping header %{public}s: dynamic section not found", task->name);
W
wangjiahui 已提交
4083 4084 4085 4086 4087 4088
		goto noexec;
	}
	return true;
noexec:
	errno = ENOEXEC;
error:
4089
	internal_free(task->allocated_buf);
W
wangjiahui 已提交
4090 4091 4092 4093
	task->allocated_buf = NULL;
	return false;
}

W
wangjiahui 已提交
4094
static bool task_map_library(struct loadtask *task, struct reserved_address_params *reserved_params)
W
wangjiahui 已提交
4095 4096 4097 4098 4099 4100 4101 4102 4103
{
	size_t addr_min = SIZE_MAX, addr_max = 0, map_len;
	size_t this_min, this_max;
	size_t nsegs = 0;
	off_t off_start;
	Phdr *ph = task->ph0;
	unsigned prot;
	unsigned char *map = MAP_FAILED, *base;
	size_t i;
W
wangjiahui 已提交
4104 4105
	int map_flags = MAP_PRIVATE;
	size_t start_addr;
W
wangjiahui 已提交
4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133

	for (i = task->eh->e_phnum; i; i--, ph = (void *)((char *)ph + task->eh->e_phentsize)) {
		if (ph->p_type == PT_GNU_RELRO) {
			task->p->relro_start = ph->p_vaddr & -PAGE_SIZE;
			task->p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
		} else if (ph->p_type == PT_GNU_STACK) {
			if (!runtime && ph->p_memsz > __default_stacksize) {
				__default_stacksize =
					ph->p_memsz < DEFAULT_STACK_MAX ?
					ph->p_memsz : DEFAULT_STACK_MAX;
			}
		}
		if (ph->p_type != PT_LOAD) {
			continue;
		}
		nsegs++;
		if (ph->p_vaddr < addr_min) {
			addr_min = ph->p_vaddr;
			off_start = ph->p_offset;
			prot = (((ph->p_flags & PF_R) ? PROT_READ : 0) |
				((ph->p_flags & PF_W) ? PROT_WRITE : 0) |
				((ph->p_flags & PF_X) ? PROT_EXEC : 0));
		}
		if (ph->p_vaddr + ph->p_memsz > addr_max) {
			addr_max = ph->p_vaddr + ph->p_memsz;
		}
	}
	if (!task->dyn) {
G
ganlan 已提交
4134
		LD_LOGE("Error mapping library %{public}s: dynamic section not found", task->name);
W
wangjiahui 已提交
4135 4136 4137
		goto noexec;
	}
	if (DL_FDPIC && !(task->eh->e_flags & FDPIC_CONSTDISP_FLAG)) {
4138
		task->p->loadmap = internal_calloc(1, sizeof(struct fdpic_loadmap) + nsegs * sizeof(struct fdpic_loadseg));
W
wangjiahui 已提交
4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151
		if (!task->p->loadmap) {
			goto error;
		}
		task->p->loadmap->nsegs = nsegs;
		for (ph = task->ph0, i = 0; i < nsegs; ph = (void *)((char *)ph + task->eh->e_phentsize)) {
			if (ph->p_type != PT_LOAD) {
				continue;
			}
			prot = (((ph->p_flags & PF_R) ? PROT_READ : 0) |
				((ph->p_flags & PF_W) ? PROT_WRITE : 0) |
				((ph->p_flags & PF_X) ? PROT_EXEC : 0));
			map = mmap(0, ph->p_memsz + (ph->p_vaddr & PAGE_SIZE - 1),
				prot, MAP_PRIVATE,
4152
				task->fd, ph->p_offset & -PAGE_SIZE + task->file_offset);
W
wangjiahui 已提交
4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182
			if (map == MAP_FAILED) {
				unmap_library(task->p);
				goto error;
			}
			task->p->loadmap->segs[i].addr = (size_t)map +
				(ph->p_vaddr & PAGE_SIZE - 1);
			task->p->loadmap->segs[i].p_vaddr = ph->p_vaddr;
			task->p->loadmap->segs[i].p_memsz = ph->p_memsz;
			i++;
			if (prot & PROT_WRITE) {
				size_t brk = (ph->p_vaddr & PAGE_SIZE - 1) + ph->p_filesz;
				size_t pgbrk = (brk + PAGE_SIZE - 1) & -PAGE_SIZE;
				size_t pgend = (brk + ph->p_memsz - ph->p_filesz + PAGE_SIZE - 1) & -PAGE_SIZE;
				if (pgend > pgbrk && mmap_fixed(map + pgbrk,
					pgend - pgbrk, prot,
					MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS,
					-1, off_start) == MAP_FAILED)
					goto error;
				memset(map + brk, 0, pgbrk - brk);
			}
		}
		map = (void *)task->p->loadmap->segs[0].addr;
		map_len = 0;
		goto done_mapping;
	}
	addr_max += PAGE_SIZE - 1;
	addr_max &= -PAGE_SIZE;
	addr_min &= -PAGE_SIZE;
	off_start &= -PAGE_SIZE;
	map_len = addr_max - addr_min + off_start;
W
wangjiahui 已提交
4183 4184 4185 4186
	start_addr = addr_min;
	if (reserved_params) {
		if (map_len > reserved_params->reserved_size) {
			if (reserved_params->must_use_reserved) {
G
ganlan 已提交
4187
				LD_LOGE("Error mapping library %{public}s: map len is larger than reserved address", task->name);
W
wangjiahui 已提交
4188 4189 4190 4191 4192 4193 4194
				goto error;
			}
		} else {
			start_addr = ((size_t)reserved_params->start_addr - 1 + PAGE_SIZE) & -PAGE_SIZE;
			map_flags |= MAP_FIXED;
		}
	}
W
wangjiahui 已提交
4195 4196 4197 4198 4199
	/* The first time, we map too much, possibly even more than
	 * the length of the file. This is okay because we will not
	 * use the invalid part; we just need to reserve the right
	 * amount of virtual address space to map over later. */
	map = DL_NOMMU_SUPPORT
W
wangjiahui 已提交
4200
			? mmap((void *)start_addr, map_len, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)
4201
			: mmap((void *)start_addr, map_len, prot, map_flags, task->fd, off_start + task->file_offset);
W
wangjiahui 已提交
4202
	if (map == MAP_FAILED) {
G
ganlan 已提交
4203
		LD_LOGE("Error mapping library %{public}s: failed to map fd", task->name);
W
wangjiahui 已提交
4204 4205
		goto error;
	}
W
wangjiahui 已提交
4206 4207 4208 4209
	if (reserved_params && map_len < reserved_params->reserved_size) {
		reserved_params->reserved_size -= (map_len + (start_addr - (size_t)reserved_params->start_addr));
		reserved_params->start_addr = (void *)((uint8_t *)map + map_len);
	}
W
wangjiahui 已提交
4210 4211 4212 4213 4214
	task->p->map = map;
	task->p->map_len = map_len;
	/* If the loaded file is not relocatable and the requested address is
	 * not available, then the load operation must fail. */
	if (task->eh->e_type != ET_DYN && addr_min && map != (void *)addr_min) {
G
ganlan 已提交
4215
		LD_LOGE("Error mapping library %{public}s: device or resource busy", task->name);
W
wangjiahui 已提交
4216 4217 4218 4219 4220 4221 4222
		errno = EBUSY;
		goto error;
	}
	base = map - addr_min;
	task->p->phdr = 0;
	task->p->phnum = 0;
	for (ph = task->ph0, i = task->eh->e_phnum; i; i--, ph = (void *)((char *)ph + task->eh->e_phentsize)) {
4223 4224 4225 4226
		if (ph->p_type == PT_OHOS_RANDOMDATA) {
			fill_random_data((void *)(ph->p_vaddr + base), ph->p_memsz);
			continue;
		}
W
wangjiahui 已提交
4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244
		if (ph->p_type != PT_LOAD) {
			continue;
		}
		/* Check if the programs headers are in this load segment, and
		 * if so, record the address for use by dl_iterate_phdr. */
		if (!task->p->phdr && task->eh->e_phoff >= ph->p_offset
			&& task->eh->e_phoff + task->phsize <= ph->p_offset + ph->p_filesz) {
			task->p->phdr = (void *)(base + ph->p_vaddr + (task->eh->e_phoff - ph->p_offset));
			task->p->phnum = task->eh->e_phnum;
			task->p->phentsize = task->eh->e_phentsize;
		}
		this_min = ph->p_vaddr & -PAGE_SIZE;
		this_max = ph->p_vaddr + ph->p_memsz + PAGE_SIZE - 1 & -PAGE_SIZE;
		off_start = ph->p_offset & -PAGE_SIZE;
		prot = (((ph->p_flags & PF_R) ? PROT_READ : 0) |
			((ph->p_flags & PF_W) ? PROT_WRITE : 0) |
			((ph->p_flags & PF_X) ? PROT_EXEC : 0));
		/* Reuse the existing mapping for the lowest-address LOAD */
G
ganlan 已提交
4245
		if ((ph->p_vaddr & -PAGE_SIZE) != addr_min || DL_NOMMU_SUPPORT) {
W
wangjiahui 已提交
4246 4247 4248 4249 4250
			if (mmap_fixed(
					base + this_min,
					this_max - this_min,
					prot, MAP_PRIVATE | MAP_FIXED,
					task->fd,
4251
					off_start + task->file_offset) == MAP_FAILED) {
G
ganlan 已提交
4252
				LD_LOGE("Error mapping library %{public}s: mmap fix failed, errno: %{public}d", task->name, errno);
W
wangjiahui 已提交
4253
				goto error;
G
ganlan 已提交
4254
			}
W
wangjiahui 已提交
4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266
		}
		if (ph->p_memsz > ph->p_filesz && (ph->p_flags & PF_W)) {
			size_t brk = (size_t)base + ph->p_vaddr + ph->p_filesz;
			size_t pgbrk = brk + PAGE_SIZE - 1 & -PAGE_SIZE;
			memset((void *)brk, 0, pgbrk - brk & PAGE_SIZE - 1);
			if (pgbrk - (size_t)base < this_max && mmap_fixed(
				(void *)pgbrk,
				(size_t)base + this_max - pgbrk,
				prot,
				MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS,
				-1,
				0) == MAP_FAILED) {
G
ganlan 已提交
4267
				LD_LOGE("Error mapping library: mmap fix failed");
W
wangjiahui 已提交
4268 4269 4270 4271 4272 4273 4274
				goto error;
			}
		}
	}
	for (i = 0; ((size_t *)(base + task->dyn))[i]; i += NEXT_DYNAMIC_INDEX) {
		if (((size_t *)(base + task->dyn))[i] == DT_TEXTREL) {
			if (mprotect(map, map_len, PROT_READ | PROT_WRITE | PROT_EXEC) && errno != ENOSYS) {
G
ganlan 已提交
4275
				LD_LOGE("Error mapping library %{public}s: mprotect failed", task->name);
W
wangjiahui 已提交
4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286
				goto error;
			}
			break;
		}
	}
done_mapping:
	task->p->base = base;
	task->p->dynv = laddr(task->p, task->dyn);
	if (task->p->tls.size) {
		task->p->tls.image = laddr(task->p, task->tls_image);
	}
4287
	internal_free(task->allocated_buf);
W
wangjiahui 已提交
4288 4289 4290 4291 4292 4293 4294 4295
	task->allocated_buf = NULL;
	return true;
noexec:
	errno = ENOEXEC;
error:
	if (map != MAP_FAILED) {
		unmap_library(task->p);
	}
4296
	internal_free(task->allocated_buf);
W
wangjiahui 已提交
4297 4298 4299 4300 4301 4302 4303 4304 4305 4306
	task->allocated_buf = NULL;
	return false;
}

static bool load_library_header(struct loadtask *task)
{
	const char *name = task->name;
	struct dso *needed_by = task->needed_by;
	ns_t *namespace = task->namespace;
	bool check_inherited = task->check_inherited;
4307
	struct zip_info z_info;
W
wangjiahui 已提交
4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362

	bool map = false;
	struct stat st;
	size_t alloc_size;
	int n_th = 0;
	int is_self = 0;

	if (!*name) {
		errno = EINVAL;
		return false;
	}

	/* Catch and block attempts to reload the implementation itself */
	if (name[NAME_INDEX_ZERO] == 'l' && name[NAME_INDEX_ONE] == 'i' && name[NAME_INDEX_TWO] == 'b') {
		static const char reserved[] =
			"c.pthread.rt.m.dl.util.xnet.";
		const char *rp, *next;
		for (rp = reserved; *rp; rp = next) {
			next = strchr(rp, '.') + 1;
			if (strncmp(name + NAME_INDEX_THREE, rp, next - rp) == 0) {
				break;
			}
		}
		if (*rp) {
			if (ldd_mode) {
				/* Track which names have been resolved
				 * and only report each one once. */
				static unsigned reported;
				unsigned mask = 1U << (rp - reserved);
				if (!(reported & mask)) {
					reported |= mask;
					dprintf(1, "\t%s => %s (%p)\n",
						name, ldso.name,
						ldso.base);
				}
			}
			is_self = 1;
		}
	}
	if (!strcmp(name, ldso.name)) {
		is_self = 1;
	}
	if (is_self) {
		if (!ldso.prev) {
			tail->next = &ldso;
			ldso.prev = tail;
			tail = &ldso;
			ldso.namespace = namespace;
			ns_add_dso(namespace, &ldso);
		}
		task->isloaded = true;
		task->p = &ldso;
		return true;
	}
	if (strchr(name, '/')) {
4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379
		char *separator = strstr(name, ZIP_FILE_PATH_SEPARATOR);
		if (separator != NULL) {
			int res = open_uncompressed_library_in_zipfile(name, &z_info, separator);
			if (!res) {
				task->pathname = name;
				if (!is_accessible(namespace, task->pathname, g_is_asan, check_inherited)) {
					LD_LOGE("Open uncompressed library: check ns accessible failed, pathname %{public}s namespace %{public}s.",
							task->pathname, namespace ? namespace->ns_name : "NULL");
					task->fd = -1;
				} else {
					task->fd = z_info.fd;
					task->file_offset = z_info.file_offset;
				}
			} else {
				LD_LOGE("Open uncompressed library in zip file failed, res = %{public}d", res);
				return false;
			}
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		} else {
4381 4382 4383 4384 4385 4386
			task->pathname = name;
			if (!is_accessible(namespace, task->pathname, g_is_asan, check_inherited)) {
				task->fd = -1;
			} else {
				task->fd = open(name, O_RDONLY | O_CLOEXEC);
			}
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		}
	} else {
		/* Search for the name to see if it's already loaded */
		/* Search in namespace */
		task->p = find_library_by_name(name, namespace, check_inherited);
		if (task->p) {
			task->isloaded = true;
			return true;
		}
		if (strlen(name) > NAME_MAX) {
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			LD_LOGE("load_library name length is larger than NAME_MAX:%{public}s.", name);
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			return false;
		}
		task->fd = -1;
		if (namespace->env_paths) {
			task->fd = path_open(name, namespace->env_paths, task->buf, sizeof task->buf);
		}
		for (task->p = needed_by; task->fd == -1 && task->p; task->p = task->p->needed_by) {
			if (fixup_rpath(task->p, task->buf, sizeof task->buf) < 0) {
				task->fd = INVALID_FD_INHIBIT_FURTHER_SEARCH; /* Inhibit further search. */
			}
			if (task->p->rpath) {
				task->fd = path_open(name, task->p->rpath, task->buf, sizeof task->buf);
			}
		}
		if (g_is_asan) {
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			task->fd = handle_asan_path_open(task->fd, name, namespace, task->buf, sizeof task->buf);
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			LD_LOGD("load_library handle_asan_path_open fd:%{public}d.", task->fd);
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		} else {
			if (task->fd == -1 && namespace->lib_paths) {
				task->fd = path_open(name, namespace->lib_paths, task->buf, sizeof task->buf);
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				LD_LOGD("load_library no asan lib_paths path_open fd:%{public}d.", task->fd);
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			}
		}
		task->pathname = task->buf;
	}
	if (task->fd < 0) {
		if (!check_inherited || !namespace->ns_inherits) {
			return false;
		}
		/* Load lib in inherited namespace. Do not check inherited again.*/
		for (size_t i = 0; i < namespace->ns_inherits->num; i++) {
			ns_inherit *inherit = namespace->ns_inherits->inherits[i];
			if (strchr(name, '/') == 0 && !is_sharable(inherit, name)) {
				continue;
			}
			task->namespace = inherit->inherited_ns;
			task->check_inherited = false;
			if (load_library_header(task)) {
				return true;
			}
		}
		return false;
	}

	if (fstat(task->fd, &st) < 0) {
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		LD_LOGE("Error loading header %{public}s: failed to get file state", task->name);
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		close(task->fd);
		task->fd = -1;
		return false;
	}
	/* Search in namespace */
4449
	task->p = find_library_by_fstat(&st, namespace, check_inherited, task->file_offset);
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	if (task->p) {
		/* If this library was previously loaded with a
		* pathname but a search found the same inode,
		* setup its shortname so it can be found by name. */
		if (!task->p->shortname && task->pathname != name) {
			task->p->shortname = strrchr(task->p->name, '/') + 1;
		}
		close(task->fd);
		task->fd = -1;
		task->isloaded = true;
		return true;
	}

	map = noload ? 0 : map_library_header(task);
	if (!map) {
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		LD_LOGE("Error loading header %{public}s: failed to map header", task->name);
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		close(task->fd);
		task->fd = -1;
		return false;
	}

	/* Allocate storage for the new DSO. When there is TLS, this
	 * storage must include a reservation for all pre-existing
	 * threads to obtain copies of both the new TLS, and an
	 * extended DTV capable of storing an additional slot for
	 * the newly-loaded DSO. */
	alloc_size = sizeof(struct dso) + strlen(task->pathname) + 1;
	if (runtime && task->tls.size) {
		size_t per_th = task->tls.size + task->tls.align + sizeof(void *) * (tls_cnt + TLS_CNT_INCREASE);
		n_th = libc.threads_minus_1 + 1;
		if (n_th > SSIZE_MAX / per_th) {
			alloc_size = SIZE_MAX;
		} else {
			alloc_size += n_th * per_th;
		}
	}
4486
	task->p = internal_calloc(1, alloc_size);
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	if (!task->p) {
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		LD_LOGE("Error loading header %{public}s: failed to allocate dso", task->name);
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		close(task->fd);
		task->fd = -1;
		return false;
	}
	task->p->dev = st.st_dev;
	task->p->ino = st.st_ino;
4495
	task->p->file_offset = task->file_offset;
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	task->p->needed_by = needed_by;
	task->p->name = task->p->buf;
	strcpy(task->p->name, task->pathname);
	task->p->tls = task->tls;
	task->p->dynv = task->dyn_addr;
	task->p->strings = task->str_addr;

	/* Add a shortname only if name arg was not an explicit pathname. */
	if (task->pathname != name) {
		task->p->shortname = strrchr(task->p->name, '/') + 1;
	}

	if (task->p->tls.size) {
		task->p->tls_id = ++tls_cnt;
		task->p->new_dtv = (void *)(-sizeof(size_t) &
			(uintptr_t)(task->p->name + strlen(task->p->name) + sizeof(size_t)));
		task->p->new_tls = (void *)(task->p->new_dtv + n_th * (tls_cnt + 1));
	}

	tail->next = task->p;
	task->p->prev = tail;
	tail = task->p;

	/* Add dso to namespace */
	task->p->namespace = namespace;
	ns_add_dso(namespace, task->p);
	return true;
}

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static void task_load_library(struct loadtask *task, struct reserved_address_params *reserved_params)
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{
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	bool map = noload ? 0 : task_map_library(task, reserved_params);
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	close(task->fd);
	task->fd = -1;
	if (!map) {
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		LD_LOGE("Error loading library %{public}s: failed to map library", task->name);
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		error("Error loading library %s: failed to map library", task->name);
		if (runtime) {
			longjmp(*rtld_fail, 1);
		}
		return;
	};

	/* Avoid the danger of getting two versions of libc mapped into the
	 * same process when an absolute pathname was used. The symbols
	 * checked are chosen to catch both musl and glibc, and to avoid
	 * false positives from interposition-hack libraries. */
	decode_dyn(task->p);
	if (find_sym(task->p, "__libc_start_main", 1).sym &&
		find_sym(task->p, "stdin", 1).sym) {
4546 4547
		do_dlclose(task->p);
		task->p = NULL;
4548 4549
		internal_free((void*)task->name);
		task->name = ld_strdup("libc.so");
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		task->check_inherited = true;
4551
		if (!load_library_header(task)) {
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			LD_LOGE("Error loading library %{public}s: failed to load libc.so", task->name);
4553 4554 4555 4556 4557
			error("Error loading library %s: failed to load libc.so", task->name);
			if (runtime) {
				longjmp(*rtld_fail, 1);
			}
		}
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		return;
	}
	/* Past this point, if we haven't reached runtime yet, ldso has
	 * committed either to use the mapped library or to abort execution.
	 * Unmapping is not possible, so we can safely reclaim gaps. */
	if (!runtime) {
		reclaim_gaps(task->p);
	}
	task->p->runtime_loaded = runtime;
	if (runtime)
		task->p->by_dlopen = 1;

	if (DL_FDPIC) {
		makefuncdescs(task->p);
	}

	if (ldd_mode) {
		dprintf(1, "\t%s => %s (%p)\n", task->name, task->pathname, task->p->base);
	}
}

static void preload_direct_deps(struct dso *p, ns_t *namespace, struct loadtasks *tasks)
{
	size_t i, cnt = 0;
	if (p->deps) {
		return;
	}
	/* For head, all preloads are direct pseudo-dependencies.
	 * Count and include them now to avoid realloc later. */
	if (p == head) {
		for (struct dso *q = p->next; q; q = q->next) {
			cnt++;
		}
	}
	for (i = 0; p->dynv[i]; i += NEXT_DYNAMIC_INDEX) {
		if (p->dynv[i] == DT_NEEDED) {
			cnt++;
		}
	}
	/* Use builtin buffer for apps with no external deps, to
	 * preserve property of no runtime failure paths. */
	p->deps = (p == head && cnt < MIN_DEPS_COUNT) ? builtin_deps :
4600
		internal_calloc(cnt + 1, sizeof *p->deps);
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	if (!p->deps) {
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		LD_LOGE("Error loading dependencies for %{public}s", p->name);
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		error("Error loading dependencies for %s", p->name);
		if (runtime) {
			longjmp(*rtld_fail, 1);
		}
	}
	cnt = 0;
	if (p == head) {
		for (struct dso *q = p->next; q; q = q->next) {
			p->deps[cnt++] = q;
		}
	}
	for (i = 0; p->dynv[i]; i += NEXT_DYNAMIC_INDEX) {
		if (p->dynv[i] != DT_NEEDED) {
			continue;
		}
		struct loadtask *task = create_loadtask(p->strings + p->dynv[i + 1], p, namespace, true);
		if (!task) {
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			LD_LOGE("Error loading dependencies %{public}s : create load task failed", p->name);
			error("Error loading dependencies for %s : create load task failed", p->name);
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			if (runtime) {
				longjmp(*rtld_fail, 1);
			}
			continue;
		}
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		LD_LOGD("loading shared library %{public}s: (needed by %{public}s)", p->strings + p->dynv[i+1], p->name);
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		if (!load_library_header(task)) {
			free_task(task);
			task = NULL;
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			LD_LOGE("Error loading shared library %{public}s: (needed by %{public}s)",
				p->strings + p->dynv[i + 1],
				p->name);
			error("Error loading shared library %s: %m (needed by %s)",
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				p->strings + p->dynv[i + 1], p->name);
			if (runtime) {
				longjmp(*rtld_fail, 1);
			}
			continue;
		}
		p->deps[cnt++] = task->p;
		if (task->isloaded) {
			free_task(task);
			task = NULL;
		} else {
			append_loadtasks(tasks, task);
		}
	}
	p->deps[cnt] = 0;
	p->ndeps_direct = cnt;
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	for (i = 0; i < p->ndeps_direct; i++) {
		add_dso_parent(p->deps[i], p);
	}
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}

static void unmap_preloaded_sections(struct loadtasks *tasks)
{
	struct loadtask *task = NULL;
	for (size_t i = 0; i < tasks->length; i++) {
		task = get_loadtask(tasks, i);
		if (!task) {
			continue;
		}
		if (task->dyn_map_len) {
			munmap(task->dyn_map, task->dyn_map_len);
			task->dyn_map = NULL;
			task->dyn_map_len = 0;
			if (task->p) {
				task->p->dynv = NULL;
			}
		}
		if (task->str_map_len) {
			munmap(task->str_map, task->str_map_len);
			task->str_map = NULL;
			task->str_map_len = 0;
			if (task->p) {
				task->p->strings = NULL;
			}
		}
	}
}

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static void preload_deps(struct dso *p, struct loadtasks *tasks)
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{
	if (p->deps) {
		return;
	}
	for (; p; p = p->next) {
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		preload_direct_deps(p, p->namespace, tasks);
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	}
}

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static void run_loadtasks(struct loadtasks *tasks, struct reserved_address_params *reserved_params)
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{
	struct loadtask *task = NULL;
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	bool reserved_address = false;
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	for (size_t i = 0; i < tasks->length; i++) {
		task = get_loadtask(tasks, i);
		if (task) {
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			if (reserved_params) {
				reserved_address = reserved_params->reserved_address_recursive || (reserved_params->target == task->p);
			}
			task_load_library(task, reserved_address ? reserved_params : NULL);
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		}
	}
}

static void assign_tls(struct dso *p)
{
	while (p) {
		if (p->tls.image) {
			tls_align = MAXP2(tls_align, p->tls.align);
#ifdef TLS_ABOVE_TP
			p->tls.offset = tls_offset + ((p->tls.align - 1) &
				(-tls_offset + (uintptr_t)p->tls.image));
			tls_offset = p->tls.offset + p->tls.size;
#else
			tls_offset += p->tls.size + p->tls.align - 1;
			tls_offset -= (tls_offset + (uintptr_t)p->tls.image)
				& (p->tls.align - 1);
			p->tls.offset = tls_offset;
#endif
			if (tls_tail) {
				tls_tail->next = &p->tls;
			} else {
				libc.tls_head = &p->tls;
			}
			tls_tail = &p->tls;
		}

		p = p->next;
	}
}

static void load_preload(char *s, ns_t *ns, struct loadtasks *tasks)
{
	int tmp;
	char *z;

	struct loadtask *task = NULL;
	for (z = s; *z; s = z) {
		for (; *s && (isspace(*s) || *s == ':'); s++) {
			;
		}
		for (z = s; *z && !isspace(*z) && *z != ':'; z++) {
			;
		}
		tmp = *z;
		*z = 0;
		task = create_loadtask(s, NULL, ns, true);
		if (!task) {
			continue;
		}
		if (load_library_header(task)) {
			if (!task->isloaded) {
				append_loadtasks(tasks, task);
				task = NULL;
			}
		}
		if (task) {
			free_task(task);
		}
		*z = tmp;
	}
}
#endif

static int serialize_gnu_relro(int fd, struct dso *dso, ssize_t *file_offset)
{
	ssize_t count = dso->relro_end - dso->relro_start;
	ssize_t offset = 0;
	while (count > 0) {
		ssize_t write_size = TEMP_FAILURE_RETRY(write(fd, laddr(dso, dso->relro_start + offset), count));
		if (-1 == write_size) {
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			LD_LOGE("Error serializing relro %{public}s: failed to write GNU_RELRO", dso->name);
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			return -1;
		}
		offset += write_size;
		count -= write_size;
	}

	ssize_t size = dso->relro_end - dso->relro_start;
	void *map = mmap(
		laddr(dso, dso->relro_start),
		size,
		PROT_READ,
		MAP_PRIVATE | MAP_FIXED,
		fd,
		*file_offset);
	if (map == MAP_FAILED) {
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		LD_LOGE("Error serializing relro %{public}s: failed to map GNU_RELRO", dso->name);
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		return -1;
	}
	*file_offset += size;
	return 0;
}

static int map_gnu_relro(int fd, struct dso *dso, ssize_t *file_offset)
{
	ssize_t ext_fd_file_size = 0;
	struct stat ext_fd_file_stat;
	if (TEMP_FAILURE_RETRY(fstat(fd, &ext_fd_file_stat)) != 0) {
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		LD_LOGE("Error mapping relro %{public}s: failed to get file state", dso->name);
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		return -1;
	}
	ext_fd_file_size = ext_fd_file_stat.st_size;

	void *ext_temp_map = MAP_FAILED;
	ext_temp_map = mmap(NULL, ext_fd_file_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if (ext_temp_map == MAP_FAILED) {
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		LD_LOGE("Error mapping relro %{public}s: failed to map fd", dso->name);
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		return -1;
	}

	char *file_base = (char *)(ext_temp_map) + *file_offset;
	char *mem_base = (char *)(laddr(dso, dso->relro_start));
	ssize_t start_offset = 0;
	ssize_t size = dso->relro_end - dso->relro_start;

	if (size > ext_fd_file_size - *file_offset) {
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		LD_LOGE("Error mapping relro %{public}s: invalid file size", dso->name);
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		return -1;
	}
	while (start_offset < size) {
		// Find start location.
		while (start_offset < size) {
			if (memcmp(mem_base + start_offset, file_base + start_offset, PAGE_SIZE) == 0) {
				break;
			}
			start_offset += PAGE_SIZE;
		}

		// Find end location.
		ssize_t end_offset = start_offset;
		while (end_offset < size) {
			if (memcmp(mem_base + end_offset, file_base + end_offset, PAGE_SIZE) != 0) {
				break;
			}
			end_offset += PAGE_SIZE;
		}

		// Map pages.
		ssize_t map_length = end_offset - start_offset;
		ssize_t map_offset = *file_offset + start_offset;
		if (map_length > 0) {
			void *map = mmap(
				mem_base + start_offset, map_length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, map_offset);
			if (map == MAP_FAILED) {
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				LD_LOGE("Error mapping relro %{public}s: failed to map GNU_RELRO", dso->name);
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				munmap(ext_temp_map, ext_fd_file_size);
				return -1;
			}
		}

		start_offset = end_offset;
	}
	*file_offset += size;
	munmap(ext_temp_map, ext_fd_file_size);
	return 0;
}

static void handle_relro_sharing(struct dso *p, const dl_extinfo *extinfo, ssize_t *relro_fd_offset)
{
	if (extinfo == NULL) {
		return;
	}
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	if (extinfo->flag & DL_EXT_WRITE_RELRO) {
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		LD_LOGD("Serializing GNU_RELRO %{public}s", p->name);
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		if (serialize_gnu_relro(extinfo->relro_fd, p, relro_fd_offset) < 0) {
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			LD_LOGE("Error serializing GNU_RELRO %{public}s", p->name);
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			error("Error serializing GNU_RELRO");
			if (runtime) longjmp(*rtld_fail, 1);
		}
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	} else if (extinfo->flag & DL_EXT_USE_RELRO) {
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		LD_LOGD("Mapping GNU_RELRO %{public}s", p->name);
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		if (map_gnu_relro(extinfo->relro_fd, p, relro_fd_offset) < 0) {
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			LD_LOGE("Error mapping GNU_RELRO %{public}s", p->name);
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			error("Error mapping GNU_RELRO");
			if (runtime) longjmp(*rtld_fail, 1);
		}
	}
}
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/* Used to get an uncompress library offset in zip file, then we can use the offset to mmap the library directly. */
int open_uncompressed_library_in_zipfile(const char *path, struct zip_info *z_info, char *separator)
{
	struct local_file_header zip_file_header;
	struct central_dir_entry c_dir_entry;
	struct zip_end_locator end_locator;

	/* Use "'!/' to split the path into zipfile path and library path in zipfile.
	 * For example:
	 * - path: x/xx/xxx.zip!/x/xx/xxx.so
	 * - zipfile path: x/xx/xxx.zip
	 * - library path in zipfile: x/xx/xxx.so  */
	if (strlcpy(z_info->path_buf, path, PATH_BUF_SIZE) >= PATH_BUF_SIZE) {
		LD_LOGE("Open uncompressed library: input path %{public}s is too long.", path);
		return -1;
	}
	z_info->path_buf[separator - path] = '\0';
	z_info->file_path_index = separator - path + 2;
	char *zip_file_path = z_info->path_buf;
	char *lib_path = &z_info->path_buf[z_info->file_path_index];
	if (zip_file_path == NULL || lib_path == NULL) {
		LD_LOGE("Open uncompressed library: get zip and lib path failed.");
		return -1;
	}
	LD_LOGD("Open uncompressed library: zip file path %{public}s library path %{public}s.", zip_file_path, lib_path);

	// Get zip file length
	FILE *zip_file = fopen(zip_file_path, "re");
	if (zip_file == NULL) {
		LD_LOGE("Open uncompressed library: fopen %{public}s failed.", zip_file_path);
		return -1;
	}
	if (fseek(zip_file, 0, SEEK_END) != 0) {
		LD_LOGE("Open uncompressed library: fseek SEEK_END failed.");
		fclose(zip_file);
		return -1;
	}
	int64_t zip_file_len = ftell(zip_file);
	if (zip_file_len == -1) {
		LD_LOGE("Open uncompressed library: get zip file length failed.");
		fclose(zip_file);
		return -1;
	}

	// Read end of central directory record.
	size_t end_locator_len = sizeof(end_locator);
	size_t end_locator_pos = zip_file_len - end_locator_len;
	if (fseek(zip_file, end_locator_pos, SEEK_SET) != 0) {
		LD_LOGE("Open uncompressed library: fseek end locator position failed.");
		fclose(zip_file);
		return -1;
	}
	if (fread(&end_locator, sizeof(end_locator), 1, zip_file) != 1 || end_locator.signature != EOCD_SIGNATURE) {
		LD_LOGE("Open uncompressed library: fread end locator failed.");
		fclose(zip_file);
		return -1;
	}

	char file_name[PATH_BUF_SIZE];
	uint64_t current_dir_pos = end_locator.offset;
	for (uint16_t i = 0; i < end_locator.total_entries; i++) {
		// Read central dir entry.
		if (fseek(zip_file, current_dir_pos, SEEK_SET) != 0) {
			LD_LOGE("Open uncompressed library: fseek current centra dir entry position failed.");
			fclose(zip_file);
			return -1;
		}
		if (fread(&c_dir_entry, sizeof(c_dir_entry), 1, zip_file) != 1 || c_dir_entry.signature != CENTRAL_SIGNATURE) {
			LD_LOGE("Open uncompressed library: fread centra dir entry failed.");
			fclose(zip_file);
			return -1;
		}

		if (fread(file_name, c_dir_entry.name_size, 1, zip_file) != 1) {
			LD_LOGE("Open uncompressed library: fread file name failed.");
			fclose(zip_file);
			return -1;
		}
		if (strcmp(file_name, lib_path) == 0) {
			// Read local file header.
			if (fseek(zip_file, c_dir_entry.local_header_offset, SEEK_SET) != 0) {
				LD_LOGE("Open uncompressed library: fseek local file header failed.");
				fclose(zip_file);
				return -1;
			}
			if (fread(&zip_file_header, sizeof(zip_file_header), 1, zip_file) != 1) {
				LD_LOGE("Open uncompressed library: fread local file header failed.");
				fclose(zip_file);
				return -1;
			}
			if (zip_file_header.signature != LOCAL_FILE_HEADER_SIGNATURE) {
				LD_LOGE("Open uncompressed library: read local file header signature error.");
				fclose(zip_file);
				return -1;
			}

			z_info->file_offset = c_dir_entry.local_header_offset + sizeof(zip_file_header) +
									zip_file_header.name_size + zip_file_header.extra_size;
			if (zip_file_header.compression_method != COMPRESS_STORED || z_info->file_offset % PAGE_SIZE != 0) {
				LD_LOGE("Open uncompressed library: open %{public}s in %{public}s failed because of misalignment or saved with compression."
						"compress method %{public}d, file offset %{public}lu",
						lib_path, zip_file_path, zip_file_header.compression_method, z_info->file_offset);
				fclose(zip_file);
				return -2;
			}
			z_info->found = true;
			break;
		}

		memset(file_name, 0, sizeof(file_name));
		current_dir_pos += sizeof(c_dir_entry);
		current_dir_pos += c_dir_entry.name_size + c_dir_entry.extra_size + c_dir_entry.comment_size;
	}
	if(!z_info->found) {
		LD_LOGE("Open uncompressed library: %{public}s was not found in %{public}s.", lib_path, zip_file_path);
		fclose(zip_file);
		return -3;
	}
	z_info->fd = fileno(zip_file);

	return 0;
}