Skip to content

K
Kernel

openeuler / Kernel
1 年多 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
提交 5d54e69c 编写于 作者: L Linus Torvalds
浏览文件
操作

Merge master.kernel.org:/pub/scm/linux/kernel/git/dwmw2/audit-2.6

上级 63f3d1df b6ddc518
隐藏空白更改
内联 并排
Showing with 356 addition and 171 deletion
MAINTAINERS
浏览文件 @ 5d54e69c
......@@ -370,7 +370,10 @@ W: http://atmelwlandriver.sourceforge.net/
S: Maintained
AUDIT SUBSYSTEM
L: linux-audit@redhat.com (subscribers-only)
P: David Woodhouse
M: dwmw2@infradead.org
L: linux-audit@redhat.com
W: http://people.redhat.com/sgrubb/audit/
S: Maintained
AX.25 NETWORK LAYER
......
arch/ppc64/kernel/asm-offsets.c
浏览文件 @ 5d54e69c
......@@ -68,6 +68,7 @@ int main(void)
DEFINE(THREAD_USED_VR, offsetof(struct thread_struct, used_vr));
#endif /* CONFIG_ALTIVEC */
DEFINE(MM, offsetof(struct task_struct, mm));
DEFINE(AUDITCONTEXT, offsetof(struct task_struct, audit_context));
DEFINE(DCACHEL1LINESIZE, offsetof(struct ppc64_caches, dline_size));
DEFINE(DCACHEL1LOGLINESIZE, offsetof(struct ppc64_caches, log_dline_size));
......
arch/ppc64/kernel/entry.S
浏览文件 @ 5d54e69c
......@@ -276,12 +276,22 @@ _GLOBAL(ppc64_rt_sigsuspend)
_GLOBAL(ppc32_rt_sigsuspend)
bl .save_nvgprs
bl .sys32_rt_sigsuspend
/* If sigsuspend() returns zero, we are going into a signal handler */
70: cmpdi 0,r3,0
beq .ret_from_except
/* If it returned -EINTR, we need to return via syscall_exit to set
/* If it returned an error, we need to return via syscall_exit to set
the SO bit in cr0 and potentially stop for ptrace. */
b syscall_exit
bne syscall_exit
/* If sigsuspend() returns zero, we are going into a signal handler. We
may need to call audit_syscall_exit() to mark the exit from sigsuspend() */
#ifdef CONFIG_AUDIT
ld r3,PACACURRENT(r13)
ld r4,AUDITCONTEXT(r3)
cmpdi 0,r4,0
beq .ret_from_except /* No audit_context: Leave immediately. */
li r4, 2 /* AUDITSC_FAILURE */
li r5,-4 /* It's always -EINTR */
bl .audit_syscall_exit
#endif
b .ret_from_except
_GLOBAL(ppc_fork)
bl .save_nvgprs
......
fs/namei.c
浏览文件 @ 5d54e69c
......@@ -1048,7 +1048,7 @@ int fastcall path_lookup(const char *name, unsigned int flags, struct nameidata
out:
if (unlikely(current->audit_context
&& nd && nd->dentry && nd->dentry->d_inode))
audit_inode(name, nd->dentry->d_inode);
audit_inode(name, nd->dentry->d_inode, flags);
return retval;
}
......
include/linux/audit.h
浏览文件 @ 5d54e69c
......@@ -51,7 +51,8 @@
#define AUDIT_WATCH_LIST 1009 /* List all file/dir watches */
#define AUDIT_SIGNAL_INFO 1010 /* Get info about sender of signal to auditd */
#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages uninteresting to kernel */
#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */
#define AUDIT_USER_AVC 1107 /* We filter this differently */
#define AUDIT_LAST_USER_MSG 1199
#define AUDIT_DAEMON_START 1200 /* Daemon startup record */
......@@ -75,10 +76,15 @@
#define AUDIT_KERNEL 2000 /* Asynchronous audit record. NOT A REQUEST. */
/* Rule flags */
#define AUDIT_PER_TASK 0x01 /* Apply rule at task creation (not syscall) */
#define AUDIT_AT_ENTRY 0x02 /* Apply rule at syscall entry */
#define AUDIT_AT_EXIT 0x04 /* Apply rule at syscall exit */
#define AUDIT_PREPEND 0x10 /* Prepend to front of list */
#define AUDIT_FILTER_USER 0x00 /* Apply rule to user-generated messages */
#define AUDIT_FILTER_TASK 0x01 /* Apply rule at task creation (not syscall) */
#define AUDIT_FILTER_ENTRY 0x02 /* Apply rule at syscall entry */
#define AUDIT_FILTER_WATCH 0x03 /* Apply rule to file system watches */
#define AUDIT_FILTER_EXIT 0x04 /* Apply rule at syscall exit */
#define AUDIT_NR_FILTERS 5
#define AUDIT_FILTER_PREPEND 0x10 /* Prepend to front of list */
/* Rule actions */
#define AUDIT_NEVER 0 /* Do not build context if rule matches */
......@@ -199,6 +205,7 @@ struct audit_sig_info {
struct audit_buffer;
struct audit_context;
struct inode;
struct netlink_skb_parms;
#define AUDITSC_INVALID 0
#define AUDITSC_SUCCESS 1
......@@ -215,7 +222,7 @@ extern void audit_syscall_entry(struct task_struct *task, int arch,
extern void audit_syscall_exit(struct task_struct *task, int failed, long return_code);
extern void audit_getname(const char *name);
extern void audit_putname(const char *name);
extern void audit_inode(const char *name, const struct inode *inode);
extern void audit_inode(const char *name, const struct inode *inode, unsigned flags);
/* Private API (for audit.c only) */
extern int audit_receive_filter(int type, int pid, int uid, int seq,
......@@ -230,6 +237,7 @@ extern int audit_socketcall(int nargs, unsigned long *args);
extern int audit_sockaddr(int len, void *addr);
extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
extern void audit_signal_info(int sig, struct task_struct *t);
extern int audit_filter_user(struct netlink_skb_parms *cb, int type);
#else
#define audit_alloc(t) ({ 0; })
#define audit_free(t) do { ; } while (0)
......@@ -237,7 +245,7 @@ extern void audit_signal_info(int sig, struct task_struct *t);
#define audit_syscall_exit(t,f,r) do { ; } while (0)
#define audit_getname(n) do { ; } while (0)
#define audit_putname(n) do { ; } while (0)
#define audit_inode(n,i) do { ; } while (0)
#define audit_inode(n,i,f) do { ; } while (0)
#define audit_receive_filter(t,p,u,s,d,l) ({ -EOPNOTSUPP; })
#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
#define audit_get_loginuid(c) ({ -1; })
......@@ -246,16 +254,17 @@ extern void audit_signal_info(int sig, struct task_struct *t);
#define audit_sockaddr(len, addr) ({ 0; })
#define audit_avc_path(dentry, mnt) ({ 0; })
#define audit_signal_info(s,t) do { ; } while (0)
#define audit_filter_user(cb,t) ({ 1; })
#endif
#ifdef CONFIG_AUDIT
/* These are defined in audit.c */
/* Public API */
extern void audit_log(struct audit_context *ctx, int type,
const char *fmt, ...)
__attribute__((format(printf,3,4)));
extern void audit_log(struct audit_context *ctx, int gfp_mask,
int type, const char *fmt, ...)
__attribute__((format(printf,4,5)));
extern struct audit_buffer *audit_log_start(struct audit_context *ctx,int type);
extern struct audit_buffer *audit_log_start(struct audit_context *ctx, int gfp_mask, int type);
extern void audit_log_format(struct audit_buffer *ab,
const char *fmt, ...)
__attribute__((format(printf,2,3)));
......@@ -274,9 +283,10 @@ extern void audit_send_reply(int pid, int seq, int type,
int done, int multi,
void *payload, int size);
extern void audit_log_lost(const char *message);
extern struct semaphore audit_netlink_sem;
#else
#define audit_log(c,t,f,...) do { ; } while (0)
#define audit_log_start(c,t) ({ NULL; })
#define audit_log(c,g,t,f,...) do { ; } while (0)
#define audit_log_start(c,g,t) ({ NULL; })
#define audit_log_vformat(b,f,a) do { ; } while (0)
#define audit_log_format(b,f,...) do { ; } while (0)
#define audit_log_end(b) do { ; } while (0)
......
kernel/audit.c
浏览文件 @ 5d54e69c
......@@ -79,6 +79,8 @@ static int audit_rate_limit;
/* Number of outstanding audit_buffers allowed. */
static int audit_backlog_limit = 64;
static int audit_backlog_wait_time = 60 * HZ;
static int audit_backlog_wait_overflow = 0;
/* The identity of the user shutting down the audit system. */
uid_t audit_sig_uid = -1;
......@@ -106,18 +108,12 @@ static LIST_HEAD(audit_freelist);
static struct sk_buff_head audit_skb_queue;
static struct task_struct *kauditd_task;
static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
/* There are three lists of rules -- one to search at task creation
* time, one to search at syscall entry time, and another to search at
* syscall exit time. */
static LIST_HEAD(audit_tsklist);
static LIST_HEAD(audit_entlist);
static LIST_HEAD(audit_extlist);
static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
/* The netlink socket is only to be read by 1 CPU, which lets us assume
* that list additions and deletions never happen simultaneously in
* auditsc.c */
static DECLARE_MUTEX(audit_netlink_sem);
DECLARE_MUTEX(audit_netlink_sem);
/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
* audit records. Since printk uses a 1024 byte buffer, this buffer
......@@ -137,6 +133,7 @@ struct audit_buffer {
struct list_head list;
struct sk_buff *skb; /* formatted skb ready to send */
struct audit_context *ctx; /* NULL or associated context */
int gfp_mask;
};
static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
......@@ -145,11 +142,6 @@ static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
nlh->nlmsg_pid = pid;
}
struct audit_entry {
struct list_head list;
struct audit_rule rule;
};
static void audit_panic(const char *message)
{
switch (audit_failure)
......@@ -233,7 +225,7 @@ static int audit_set_rate_limit(int limit, uid_t loginuid)
{
int old = audit_rate_limit;
audit_rate_limit = limit;
audit_log(NULL, AUDIT_CONFIG_CHANGE,
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_rate_limit=%d old=%d by auid=%u",
audit_rate_limit, old, loginuid);
return old;
......@@ -243,7 +235,7 @@ static int audit_set_backlog_limit(int limit, uid_t loginuid)
{
int old = audit_backlog_limit;
audit_backlog_limit = limit;
audit_log(NULL, AUDIT_CONFIG_CHANGE,
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_backlog_limit=%d old=%d by auid=%u",
audit_backlog_limit, old, loginuid);
return old;
......@@ -255,7 +247,7 @@ static int audit_set_enabled(int state, uid_t loginuid)
if (state != 0 && state != 1)
return -EINVAL;
audit_enabled = state;
audit_log(NULL, AUDIT_CONFIG_CHANGE,
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_enabled=%d old=%d by auid=%u",
audit_enabled, old, loginuid);
return old;
......@@ -269,7 +261,7 @@ static int audit_set_failure(int state, uid_t loginuid)
&& state != AUDIT_FAIL_PANIC)
return -EINVAL;
audit_failure = state;
audit_log(NULL, AUDIT_CONFIG_CHANGE,
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_failure=%d old=%d by auid=%u",
audit_failure, old, loginuid);
return old;
......@@ -281,6 +273,7 @@ int kauditd_thread(void *dummy)
while (1) {
skb = skb_dequeue(&audit_skb_queue);
wake_up(&audit_backlog_wait);
if (skb) {
if (audit_pid) {
int err = netlink_unicast(audit_sock, skb, audit_pid, 0);
......@@ -290,7 +283,7 @@ int kauditd_thread(void *dummy)
audit_pid = 0;
}
} else {
printk(KERN_ERR "%s\n", skb->data + NLMSG_SPACE(0));
printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
kfree_skb(skb);
}
} else {
......@@ -423,7 +416,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (status_get->mask & AUDIT_STATUS_PID) {
int old = audit_pid;
audit_pid = status_get->pid;
audit_log(NULL, AUDIT_CONFIG_CHANGE,
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"audit_pid=%d old=%d by auid=%u",
audit_pid, old, loginuid);
}
......@@ -435,15 +428,21 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
break;
case AUDIT_USER:
case AUDIT_FIRST_USER_MSG...AUDIT_LAST_USER_MSG:
ab = audit_log_start(NULL, msg_type);
if (!ab)
break; /* audit_panic has been called */
audit_log_format(ab,
"user pid=%d uid=%u auid=%u"
" msg='%.1024s'",
pid, uid, loginuid, (char *)data);
audit_set_pid(ab, pid);
audit_log_end(ab);
if (!audit_enabled && msg_type != AUDIT_USER_AVC)
return 0;
err = audit_filter_user(&NETLINK_CB(skb), msg_type);
if (err == 1) {
err = 0;
ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
if (ab) {
audit_log_format(ab,
"user pid=%d uid=%u auid=%u msg='%.1024s'",
pid, uid, loginuid, (char *)data);
audit_set_pid(ab, pid);
audit_log_end(ab);
}
}
break;
case AUDIT_ADD:
case AUDIT_DEL:
......@@ -523,7 +522,7 @@ static int __init audit_init(void)
skb_queue_head_init(&audit_skb_queue);
audit_initialized = 1;
audit_enabled = audit_default;
audit_log(NULL, AUDIT_KERNEL, "initialized");
audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
return 0;
}
__initcall(audit_init);
......@@ -561,7 +560,7 @@ static void audit_buffer_free(struct audit_buffer *ab)
}
static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
int gfp_mask, int type)
unsigned int __nocast gfp_mask, int type)
{
unsigned long flags;
struct audit_buffer *ab = NULL;
......@@ -587,6 +586,7 @@ static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
goto err;
ab->ctx = ctx;
ab->gfp_mask = gfp_mask;
nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
nlh->nlmsg_type = type;
nlh->nlmsg_flags = 0;
......@@ -606,26 +606,27 @@ static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
* (timestamp,serial) tuple is unique for each syscall and is live from
* syscall entry to syscall exit.
*
* Atomic values are only guaranteed to be 24-bit, so we count down.
*
* NOTE: Another possibility is to store the formatted records off the
* audit context (for those records that have a context), and emit them
* all at syscall exit. However, this could delay the reporting of
* significant errors until syscall exit (or never, if the system
* halts). */
unsigned int audit_serial(void)
{
static atomic_t serial = ATOMIC_INIT(0xffffff);
unsigned int a, b;
static spinlock_t serial_lock = SPIN_LOCK_UNLOCKED;
static unsigned int serial = 0;
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(&serial_lock, flags);
do {
a = atomic_read(&serial);
if (atomic_dec_and_test(&serial))
atomic_set(&serial, 0xffffff);
b = atomic_read(&serial);
} while (b != a - 1);
ret = ++serial;
} while (unlikely(!ret));
spin_unlock_irqrestore(&serial_lock, flags);
return 0xffffff - b;
return ret;
}
static inline void audit_get_stamp(struct audit_context *ctx,
......@@ -645,17 +646,43 @@ static inline void audit_get_stamp(struct audit_context *ctx,
* syscall, then the syscall is marked as auditable and an audit record
* will be written at syscall exit. If there is no associated task, tsk
* should be NULL. */
struct audit_buffer *audit_log_start(struct audit_context *ctx, int type)
struct audit_buffer *audit_log_start(struct audit_context *ctx, int gfp_mask,
int type)
{
struct audit_buffer *ab = NULL;
struct timespec t;
unsigned int serial;
int reserve;
unsigned long timeout_start = jiffies;
if (!audit_initialized)
return NULL;
if (audit_backlog_limit
&& skb_queue_len(&audit_skb_queue) > audit_backlog_limit) {
if (gfp_mask & __GFP_WAIT)
reserve = 0;
else
reserve = 5; /* Allow atomic callers to go up to five
entries over the normal backlog limit */
while (audit_backlog_limit
&& skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
&& time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
/* Wait for auditd to drain the queue a little */
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&audit_backlog_wait, &wait);
if (audit_backlog_limit &&
skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
__set_current_state(TASK_RUNNING);
remove_wait_queue(&audit_backlog_wait, &wait);
continue;
}
if (audit_rate_check())
printk(KERN_WARNING
"audit: audit_backlog=%d > "
......@@ -663,10 +690,12 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, int type)
skb_queue_len(&audit_skb_queue),
audit_backlog_limit);
audit_log_lost("backlog limit exceeded");
audit_backlog_wait_time = audit_backlog_wait_overflow;
wake_up(&audit_backlog_wait);
return NULL;
}
ab = audit_buffer_alloc(ctx, GFP_ATOMIC, type);
ab = audit_buffer_alloc(ctx, gfp_mask, type);
if (!ab) {
audit_log_lost("out of memory in audit_log_start");
return NULL;
......@@ -690,7 +719,7 @@ static inline int audit_expand(struct audit_buffer *ab, int extra)
{
struct sk_buff *skb = ab->skb;
int ret = pskb_expand_head(skb, skb_headroom(skb), extra,
GFP_ATOMIC);
ab->gfp_mask);
if (ret < 0) {
audit_log_lost("out of memory in audit_expand");
return 0;
......@@ -809,7 +838,7 @@ void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
audit_log_format(ab, " %s", prefix);
/* We will allow 11 spaces for ' (deleted)' to be appended */
path = kmalloc(PATH_MAX+11, GFP_KERNEL);
path = kmalloc(PATH_MAX+11, ab->gfp_mask);
if (!path) {
audit_log_format(ab, "<no memory>");
return;
......@@ -841,7 +870,7 @@ void audit_log_end(struct audit_buffer *ab)
ab->skb = NULL;
wake_up_interruptible(&kauditd_wait);
} else {
printk("%s\n", ab->skb->data + NLMSG_SPACE(0));
printk(KERN_NOTICE "%s\n", ab->skb->data + NLMSG_SPACE(0));
}
}
audit_buffer_free(ab);
......@@ -850,12 +879,13 @@ void audit_log_end(struct audit_buffer *ab)
/* Log an audit record. This is a convenience function that calls
* audit_log_start, audit_log_vformat, and audit_log_end. It may be
* called in any context. */
void audit_log(struct audit_context *ctx, int type, const char *fmt, ...)
void audit_log(struct audit_context *ctx, int gfp_mask, int type,
const char *fmt, ...)
{
struct audit_buffer *ab;
va_list args;
ab = audit_log_start(ctx, type);
ab = audit_log_start(ctx, gfp_mask, type);
if (ab) {
va_start(args, fmt);
audit_log_vformat(ab, fmt, args);
......
kernel/auditsc.c
浏览文件 @ 5d54e69c
......@@ -39,6 +39,9 @@
#include <linux/audit.h>
#include <linux/personality.h>
#include <linux/time.h>
#include <linux/kthread.h>
#include <linux/netlink.h>
#include <linux/compiler.h>
#include <asm/unistd.h>
/* 0 = no checking
......@@ -95,6 +98,7 @@ struct audit_names {
uid_t uid;
gid_t gid;
dev_t rdev;
unsigned flags;
};
struct audit_aux_data {
......@@ -167,9 +171,16 @@ struct audit_context {
/* There are three lists of rules -- one to search at task creation
* time, one to search at syscall entry time, and another to search at
* syscall exit time. */
static LIST_HEAD(audit_tsklist);
static LIST_HEAD(audit_entlist);
static LIST_HEAD(audit_extlist);
static struct list_head audit_filter_list[AUDIT_NR_FILTERS] = {
LIST_HEAD_INIT(audit_filter_list[0]),
LIST_HEAD_INIT(audit_filter_list[1]),
LIST_HEAD_INIT(audit_filter_list[2]),
LIST_HEAD_INIT(audit_filter_list[3]),
LIST_HEAD_INIT(audit_filter_list[4]),
#if AUDIT_NR_FILTERS != 5
#error Fix audit_filter_list initialiser
#endif
};
struct audit_entry {
struct list_head list;
......@@ -179,9 +190,36 @@ struct audit_entry {
extern int audit_pid;
/* Copy rule from user-space to kernel-space. Called from
* audit_add_rule during AUDIT_ADD. */
static inline int audit_copy_rule(struct audit_rule *d, struct audit_rule *s)
{
int i;
if (s->action != AUDIT_NEVER
&& s->action != AUDIT_POSSIBLE
&& s->action != AUDIT_ALWAYS)
return -1;
if (s->field_count < 0 || s->field_count > AUDIT_MAX_FIELDS)
return -1;
if ((s->flags & ~AUDIT_FILTER_PREPEND) >= AUDIT_NR_FILTERS)
return -1;
d->flags = s->flags;
d->action = s->action;
d->field_count = s->field_count;
for (i = 0; i < d->field_count; i++) {
d->fields[i] = s->fields[i];
d->values[i] = s->values[i];
}
for (i = 0; i < AUDIT_BITMASK_SIZE; i++) d->mask[i] = s->mask[i];
return 0;
}
/* Check to see if two rules are identical. It is called from
* audit_add_rule during AUDIT_ADD and
* audit_del_rule during AUDIT_DEL. */
static int audit_compare_rule(struct audit_rule *a, struct audit_rule *b)
static inline int audit_compare_rule(struct audit_rule *a, struct audit_rule *b)
{
int i;
......@@ -210,19 +248,37 @@ static int audit_compare_rule(struct audit_rule *a, struct audit_rule *b)
/* Note that audit_add_rule and audit_del_rule are called via
* audit_receive() in audit.c, and are protected by
* audit_netlink_sem. */
static inline int audit_add_rule(struct audit_entry *entry,
struct list_head *list)
static inline int audit_add_rule(struct audit_rule *rule,
struct list_head *list)
{
if (entry->rule.flags & AUDIT_PREPEND) {
entry->rule.flags &= ~AUDIT_PREPEND;
struct audit_entry *entry;
/* Do not use the _rcu iterator here, since this is the only
* addition routine. */
list_for_each_entry(entry, list, list) {
if (!audit_compare_rule(rule, &entry->rule)) {
return -EEXIST;
}
}
if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
return -ENOMEM;
if (audit_copy_rule(&entry->rule, rule)) {
kfree(entry);
return -EINVAL;
}
if (entry->rule.flags & AUDIT_FILTER_PREPEND) {
entry->rule.flags &= ~AUDIT_FILTER_PREPEND;
list_add_rcu(&entry->list, list);
} else {
list_add_tail_rcu(&entry->list, list);
}
return 0;
}
static void audit_free_rule(struct rcu_head *head)
static inline void audit_free_rule(struct rcu_head *head)
{
struct audit_entry *e = container_of(head, struct audit_entry, rcu);
kfree(e);
......@@ -245,82 +301,82 @@ static inline int audit_del_rule(struct audit_rule *rule,
return 0;
}
}
return -EFAULT; /* No matching rule */
return -ENOENT; /* No matching rule */
}
/* Copy rule from user-space to kernel-space. Called during
* AUDIT_ADD. */
static int audit_copy_rule(struct audit_rule *d, struct audit_rule *s)
static int audit_list_rules(void *_dest)
{
int pid, seq;
int *dest = _dest;
struct audit_entry *entry;
int i;
if (s->action != AUDIT_NEVER
&& s->action != AUDIT_POSSIBLE
&& s->action != AUDIT_ALWAYS)
return -1;
if (s->field_count < 0 || s->field_count > AUDIT_MAX_FIELDS)
return -1;
pid = dest[0];
seq = dest[1];
kfree(dest);
d->flags = s->flags;
d->action = s->action;
d->field_count = s->field_count;
for (i = 0; i < d->field_count; i++) {
d->fields[i] = s->fields[i];
d->values[i] = s->values[i];
down(&audit_netlink_sem);
/* The *_rcu iterators not needed here because we are
always called with audit_netlink_sem held. */
for (i=0; i<AUDIT_NR_FILTERS; i++) {
list_for_each_entry(entry, &audit_filter_list[i], list)
audit_send_reply(pid, seq, AUDIT_LIST, 0, 1,
&entry->rule, sizeof(entry->rule));
}
for (i = 0; i < AUDIT_BITMASK_SIZE; i++) d->mask[i] = s->mask[i];
audit_send_reply(pid, seq, AUDIT_LIST, 1, 1, NULL, 0);
up(&audit_netlink_sem);
return 0;
}
int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
uid_t loginuid)
{
u32 flags;
struct audit_entry *entry;
struct task_struct *tsk;
int *dest;
int err = 0;
unsigned listnr;
switch (type) {
case AUDIT_LIST:
/* The *_rcu iterators not needed here because we are
always called with audit_netlink_sem held. */
list_for_each_entry(entry, &audit_tsklist, list)
audit_send_reply(pid, seq, AUDIT_LIST, 0, 1,
&entry->rule, sizeof(entry->rule));
list_for_each_entry(entry, &audit_entlist, list)
audit_send_reply(pid, seq, AUDIT_LIST, 0, 1,
&entry->rule, sizeof(entry->rule));
list_for_each_entry(entry, &audit_extlist, list)
audit_send_reply(pid, seq, AUDIT_LIST, 0, 1,
&entry->rule, sizeof(entry->rule));
audit_send_reply(pid, seq, AUDIT_LIST, 1, 1, NULL, 0);
/* We can't just spew out the rules here because we might fill
* the available socket buffer space and deadlock waiting for
* auditctl to read from it... which isn't ever going to
* happen if we're actually running in the context of auditctl
* trying to _send_ the stuff */
dest = kmalloc(2 * sizeof(int), GFP_KERNEL);
if (!dest)
return -ENOMEM;
dest[0] = pid;
dest[1] = seq;
tsk = kthread_run(audit_list_rules, dest, "audit_list_rules");
if (IS_ERR(tsk)) {
kfree(dest);
err = PTR_ERR(tsk);
}
break;
case AUDIT_ADD:
if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
return -ENOMEM;
if (audit_copy_rule(&entry->rule, data)) {
kfree(entry);
listnr =((struct audit_rule *)data)->flags & ~AUDIT_FILTER_PREPEND;
if (listnr >= AUDIT_NR_FILTERS)
return -EINVAL;
}
flags = entry->rule.flags;
if (!err && (flags & AUDIT_PER_TASK))
err = audit_add_rule(entry, &audit_tsklist);
if (!err && (flags & AUDIT_AT_ENTRY))
err = audit_add_rule(entry, &audit_entlist);
if (!err && (flags & AUDIT_AT_EXIT))
err = audit_add_rule(entry, &audit_extlist);
audit_log(NULL, AUDIT_CONFIG_CHANGE,
"auid=%u added an audit rule\n", loginuid);
err = audit_add_rule(data, &audit_filter_list[listnr]);
if (!err)
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"auid=%u added an audit rule\n", loginuid);
break;
case AUDIT_DEL:
flags =((struct audit_rule *)data)->flags;
if (!err && (flags & AUDIT_PER_TASK))
err = audit_del_rule(data, &audit_tsklist);
if (!err && (flags & AUDIT_AT_ENTRY))
err = audit_del_rule(data, &audit_entlist);
if (!err && (flags & AUDIT_AT_EXIT))
err = audit_del_rule(data, &audit_extlist);
audit_log(NULL, AUDIT_CONFIG_CHANGE,
"auid=%u removed an audit rule\n", loginuid);
listnr =((struct audit_rule *)data)->flags & ~AUDIT_FILTER_PREPEND;
if (listnr >= AUDIT_NR_FILTERS)
return -EINVAL;
err = audit_del_rule(data, &audit_filter_list[listnr]);
if (!err)
audit_log(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE,
"auid=%u removed an audit rule\n", loginuid);
break;
default:
return -EINVAL;
......@@ -384,8 +440,12 @@ static int audit_filter_rules(struct task_struct *tsk,
result = (ctx->return_code == value);
break;
case AUDIT_SUCCESS:
if (ctx && ctx->return_valid)
result = (ctx->return_valid == AUDITSC_SUCCESS);
if (ctx && ctx->return_valid) {
if (value)
result = (ctx->return_valid == AUDITSC_SUCCESS);
else
result = (ctx->return_valid == AUDITSC_FAILURE);
}
break;
case AUDIT_DEVMAJOR:
if (ctx) {
......@@ -454,7 +514,7 @@ static enum audit_state audit_filter_task(struct task_struct *tsk)
enum audit_state state;
rcu_read_lock();
list_for_each_entry_rcu(e, &audit_tsklist, list) {
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
if (audit_filter_rules(tsk, &e->rule, NULL, &state)) {
rcu_read_unlock();
return state;
......@@ -472,22 +532,86 @@ static enum audit_state audit_filter_task(struct task_struct *tsk)
static enum audit_state audit_filter_syscall(struct task_struct *tsk,
struct audit_context *ctx,
struct list_head *list)
{
struct audit_entry *e;
enum audit_state state;
if (audit_pid && tsk->tgid == audit_pid)
return AUDIT_DISABLED;
rcu_read_lock();
if (!list_empty(list)) {
int word = AUDIT_WORD(ctx->major);
int bit = AUDIT_BIT(ctx->major);
list_for_each_entry_rcu(e, list, list) {
if ((e->rule.mask[word] & bit) == bit
&& audit_filter_rules(tsk, &e->rule, ctx, &state)) {
rcu_read_unlock();
return state;
}
}
}
rcu_read_unlock();
return AUDIT_BUILD_CONTEXT;
}
static int audit_filter_user_rules(struct netlink_skb_parms *cb,
struct audit_rule *rule,
enum audit_state *state)
{
int i;
for (i = 0; i < rule->field_count; i++) {
u32 field = rule->fields[i] & ~AUDIT_NEGATE;
u32 value = rule->values[i];
int result = 0;
switch (field) {
case AUDIT_PID:
result = (cb->creds.pid == value);
break;
case AUDIT_UID:
result = (cb->creds.uid == value);
break;
case AUDIT_GID:
result = (cb->creds.gid == value);
break;
case AUDIT_LOGINUID:
result = (cb->loginuid == value);
break;
}
if (rule->fields[i] & AUDIT_NEGATE)
result = !result;
if (!result)
return 0;
}
switch (rule->action) {
case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
case AUDIT_POSSIBLE: *state = AUDIT_BUILD_CONTEXT; break;
case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
}
return 1;
}
int audit_filter_user(struct netlink_skb_parms *cb, int type)
{
struct audit_entry *e;
enum audit_state state;
int word = AUDIT_WORD(ctx->major);
int bit = AUDIT_BIT(ctx->major);
int ret = 1;
rcu_read_lock();
list_for_each_entry_rcu(e, list, list) {
if ((e->rule.mask[word] & bit) == bit
&& audit_filter_rules(tsk, &e->rule, ctx, &state)) {
rcu_read_unlock();
return state;
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) {
if (audit_filter_user_rules(cb, &e->rule, &state)) {
if (state == AUDIT_DISABLED)
ret = 0;
break;
}
}
rcu_read_unlock();
return AUDIT_BUILD_CONTEXT;
return ret; /* Audit by default */
}
/* This should be called with task_lock() held. */
......@@ -504,7 +628,7 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
if (context->in_syscall && !context->auditable) {
enum audit_state state;
state = audit_filter_syscall(tsk, context, &audit_extlist);
state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
if (state == AUDIT_RECORD_CONTEXT)
context->auditable = 1;
}
......@@ -679,13 +803,13 @@ static void audit_log_task_info(struct audit_buffer *ab)
up_read(&mm->mmap_sem);
}
static void audit_log_exit(struct audit_context *context)
static void audit_log_exit(struct audit_context *context, unsigned int gfp_mask)
{
int i;
struct audit_buffer *ab;
struct audit_aux_data *aux;
ab = audit_log_start(context, AUDIT_SYSCALL);
ab = audit_log_start(context, gfp_mask, AUDIT_SYSCALL);
if (!ab)
return; /* audit_panic has been called */
audit_log_format(ab, "arch=%x syscall=%d",
......@@ -717,7 +841,7 @@ static void audit_log_exit(struct audit_context *context)
for (aux = context->aux; aux; aux = aux->next) {
ab = audit_log_start(context, aux->type);
ab = audit_log_start(context, GFP_KERNEL, aux->type);
if (!ab)
continue; /* audit_panic has been called */
......@@ -754,14 +878,14 @@ static void audit_log_exit(struct audit_context *context)
}
if (context->pwd && context->pwdmnt) {
ab = audit_log_start(context, AUDIT_CWD);
ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
if (ab) {
audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt);
audit_log_end(ab);
}
}
for (i = 0; i < context->name_count; i++) {
ab = audit_log_start(context, AUDIT_PATH);
ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
if (!ab)
continue; /* audit_panic has been called */
......@@ -770,6 +894,8 @@ static void audit_log_exit(struct audit_context *context)
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, context->names[i].name);
}
audit_log_format(ab, " flags=%x\n", context->names[i].flags);
if (context->names[i].ino != (unsigned long)-1)
audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#o"
" ouid=%u ogid=%u rdev=%02x:%02x",
......@@ -799,9 +925,11 @@ void audit_free(struct task_struct *tsk)
return;
/* Check for system calls that do not go through the exit
* function (e.g., exit_group), then free context block. */
if (context->in_syscall && context->auditable && context->pid != audit_pid)
audit_log_exit(context);
* function (e.g., exit_group), then free context block.
* We use GFP_ATOMIC here because we might be doing this
* in the context of the idle thread */
if (context->in_syscall && context->auditable)
audit_log_exit(context, GFP_ATOMIC);
audit_free_context(context);
}
......@@ -876,11 +1004,11 @@ void audit_syscall_entry(struct task_struct *tsk, int arch, int major,
state = context->state;
if (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT)
state = audit_filter_syscall(tsk, context, &audit_entlist);
state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
if (likely(state == AUDIT_DISABLED))
return;
context->serial = audit_serial();
context->serial = 0;
context->ctime = CURRENT_TIME;
context->in_syscall = 1;
context->auditable = !!(state == AUDIT_RECORD_CONTEXT);
......@@ -903,10 +1031,10 @@ void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code)
/* Not having a context here is ok, since the parent may have
* called __put_task_struct. */
if (likely(!context))
return;
goto out;
if (context->in_syscall && context->auditable && context->pid != audit_pid)
audit_log_exit(context);
if (context->in_syscall && context->auditable)
audit_log_exit(context, GFP_KERNEL);
context->in_syscall = 0;
context->auditable = 0;
......@@ -919,9 +1047,9 @@ void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code)
} else {
audit_free_names(context);
audit_free_aux(context);
audit_zero_context(context, context->state);
tsk->audit_context = context;
}
out:
put_task_struct(tsk);
}
......@@ -996,7 +1124,7 @@ void audit_putname(const char *name)
/* Store the inode and device from a lookup. Called from
* fs/namei.c:path_lookup(). */
void audit_inode(const char *name, const struct inode *inode)
void audit_inode(const char *name, const struct inode *inode, unsigned flags)
{
int idx;
struct audit_context *context = current->audit_context;
......@@ -1022,17 +1150,20 @@ void audit_inode(const char *name, const struct inode *inode)
++context->ino_count;
#endif
}
context->names[idx].ino = inode->i_ino;
context->names[idx].dev = inode->i_sb->s_dev;
context->names[idx].mode = inode->i_mode;
context->names[idx].uid = inode->i_uid;
context->names[idx].gid = inode->i_gid;
context->names[idx].rdev = inode->i_rdev;
context->names[idx].flags = flags;
context->names[idx].ino = inode->i_ino;
context->names[idx].dev = inode->i_sb->s_dev;
context->names[idx].mode = inode->i_mode;
context->names[idx].uid = inode->i_uid;
context->names[idx].gid = inode->i_gid;
context->names[idx].rdev = inode->i_rdev;
}
void auditsc_get_stamp(struct audit_context *ctx,
struct timespec *t, unsigned int *serial)
{
if (!ctx->serial)
ctx->serial = audit_serial();
t->tv_sec = ctx->ctime.tv_sec;
t->tv_nsec = ctx->ctime.tv_nsec;
*serial = ctx->serial;
......@@ -1044,7 +1175,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
if (task->audit_context) {
struct audit_buffer *ab;
ab = audit_log_start(NULL, AUDIT_LOGIN);
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
if (ab) {
audit_log_format(ab, "login pid=%d uid=%u "
"old auid=%u new auid=%u",
......@@ -1153,7 +1284,7 @@ void audit_signal_info(int sig, struct task_struct *t)
extern pid_t audit_sig_pid;
extern uid_t audit_sig_uid;
if (unlikely(audit_pid && t->pid == audit_pid)) {
if (unlikely(audit_pid && t->tgid == audit_pid)) {
if (sig == SIGTERM || sig == SIGHUP) {
struct audit_context *ctx = current->audit_context;
audit_sig_pid = current->pid;
......
security/selinux/avc.c
浏览文件 @ 5d54e69c
......@@ -242,7 +242,7 @@ void __init avc_init(void)
avc_node_cachep = kmem_cache_create("avc_node", sizeof(struct avc_node),
0, SLAB_PANIC, NULL, NULL);
audit_log(current->audit_context, AUDIT_KERNEL, "AVC INITIALIZED\n");
audit_log(current->audit_context, GFP_KERNEL, AUDIT_KERNEL, "AVC INITIALIZED\n");
}
int avc_get_hash_stats(char *page)
......@@ -550,7 +550,7 @@ void avc_audit(u32 ssid, u32 tsid,
return;
}
ab = audit_log_start(current->audit_context, AUDIT_AVC);
ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_AVC);
if (!ab)
return; /* audit_panic has been called */
audit_log_format(ab, "avc: %s ", denied ? "denied" : "granted");
......
security/selinux/hooks.c
浏览文件 @ 5d54e69c
......@@ -3389,7 +3389,7 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
if (err) {
if (err == -EINVAL) {
audit_log(current->audit_context, AUDIT_SELINUX_ERR,
audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
"SELinux: unrecognized netlink message"
" type=%hu for sclass=%hu\n",
nlh->nlmsg_type, isec->sclass);
......
security/selinux/ss/services.c
浏览文件 @ 5d54e69c
......@@ -381,7 +381,7 @@ static int security_validtrans_handle_fail(struct context *ocontext,
goto out;
if (context_struct_to_string(tcontext, &t, &tlen) < 0)
goto out;
audit_log(current->audit_context, AUDIT_SELINUX_ERR,
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
"security_validate_transition: denied for"
" oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
o, n, t, policydb.p_class_val_to_name[tclass-1]);
......@@ -787,7 +787,7 @@ static int compute_sid_handle_invalid_context(
goto out;
if (context_struct_to_string(newcontext, &n, &nlen) < 0)
goto out;
audit_log(current->audit_context, AUDIT_SELINUX_ERR,
audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
"security_compute_sid: invalid context %s"
" for scontext=%s"
" tcontext=%s"
......
Markdown is supported
0% 或 .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑！
想要评论请 注册 或