module.c 76.5 KB
Newer Older
1
/*
L
Linus Torvalds 已提交
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
   Copyright (C) 2002 Richard Henderson
   Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#include <linux/module.h>
#include <linux/moduleloader.h>
21
#include <linux/ftrace_event.h>
L
Linus Torvalds 已提交
22
#include <linux/init.h>
23
#include <linux/kallsyms.h>
24
#include <linux/fs.h>
R
Roland McGrath 已提交
25
#include <linux/sysfs.h>
26
#include <linux/kernel.h>
L
Linus Torvalds 已提交
27 28 29
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/elf.h>
30
#include <linux/proc_fs.h>
L
Linus Torvalds 已提交
31 32 33 34
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/fcntl.h>
#include <linux/rcupdate.h>
35
#include <linux/capability.h>
L
Linus Torvalds 已提交
36 37 38 39 40 41
#include <linux/cpu.h>
#include <linux/moduleparam.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/vermagic.h>
#include <linux/notifier.h>
A
Al Viro 已提交
42
#include <linux/sched.h>
L
Linus Torvalds 已提交
43 44
#include <linux/stop_machine.h>
#include <linux/device.h>
45
#include <linux/string.h>
A
Arjan van de Ven 已提交
46
#include <linux/mutex.h>
47
#include <linux/rculist.h>
L
Linus Torvalds 已提交
48 49
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
50
#include <linux/license.h>
51
#include <asm/sections.h>
M
Mathieu Desnoyers 已提交
52
#include <linux/tracepoint.h>
53
#include <linux/ftrace.h>
54
#include <linux/async.h>
55
#include <linux/percpu.h>
C
Catalin Marinas 已提交
56
#include <linux/kmemleak.h>
L
Linus Torvalds 已提交
57

58 59 60 61 62
#define CREATE_TRACE_POINTS
#include <trace/events/module.h>

EXPORT_TRACEPOINT_SYMBOL(module_get);

L
Linus Torvalds 已提交
63 64 65 66 67 68 69 70 71 72 73 74 75
#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt , a...)
#endif

#ifndef ARCH_SHF_SMALL
#define ARCH_SHF_SMALL 0
#endif

/* If this is set, the section belongs in the init part of the module */
#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))

R
Rusty Russell 已提交
76
/* List of modules, protected by module_mutex or preempt_disable
77
 * (delete uses stop_machine/add uses RCU list operations). */
78 79
DEFINE_MUTEX(module_mutex);
EXPORT_SYMBOL_GPL(module_mutex);
L
Linus Torvalds 已提交
80 81
static LIST_HEAD(modules);

82 83 84
/* Block module loading/unloading? */
int modules_disabled = 0;

85 86 87
/* Waiting for a module to finish initializing? */
static DECLARE_WAIT_QUEUE_HEAD(module_wq);

88
static BLOCKING_NOTIFIER_HEAD(module_notify_list);
L
Linus Torvalds 已提交
89

R
Rusty Russell 已提交
90
/* Bounds of module allocation, for speeding __module_address */
91 92
static unsigned long module_addr_min = -1UL, module_addr_max = 0;

L
Linus Torvalds 已提交
93 94
int register_module_notifier(struct notifier_block * nb)
{
95
	return blocking_notifier_chain_register(&module_notify_list, nb);
L
Linus Torvalds 已提交
96 97 98 99 100
}
EXPORT_SYMBOL(register_module_notifier);

int unregister_module_notifier(struct notifier_block * nb)
{
101
	return blocking_notifier_chain_unregister(&module_notify_list, nb);
L
Linus Torvalds 已提交
102 103 104
}
EXPORT_SYMBOL(unregister_module_notifier);

105 106
/* We require a truly strong try_module_get(): 0 means failure due to
   ongoing or failed initialization etc. */
L
Linus Torvalds 已提交
107 108 109
static inline int strong_try_module_get(struct module *mod)
{
	if (mod && mod->state == MODULE_STATE_COMING)
110 111
		return -EBUSY;
	if (try_module_get(mod))
L
Linus Torvalds 已提交
112
		return 0;
113 114
	else
		return -ENOENT;
L
Linus Torvalds 已提交
115 116
}

117 118 119
static inline void add_taint_module(struct module *mod, unsigned flag)
{
	add_taint(flag);
A
Andi Kleen 已提交
120
	mod->taints |= (1U << flag);
121 122
}

123 124 125
/*
 * A thread that wants to hold a reference to a module only while it
 * is running can call this to safely exit.  nfsd and lockd use this.
L
Linus Torvalds 已提交
126 127 128 129 130 131 132
 */
void __module_put_and_exit(struct module *mod, long code)
{
	module_put(mod);
	do_exit(code);
}
EXPORT_SYMBOL(__module_put_and_exit);
D
Daniel Walker 已提交
133

L
Linus Torvalds 已提交
134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
/* Find a module section: 0 means not found. */
static unsigned int find_sec(Elf_Ehdr *hdr,
			     Elf_Shdr *sechdrs,
			     const char *secstrings,
			     const char *name)
{
	unsigned int i;

	for (i = 1; i < hdr->e_shnum; i++)
		/* Alloc bit cleared means "ignore it." */
		if ((sechdrs[i].sh_flags & SHF_ALLOC)
		    && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
			return i;
	return 0;
}

R
Rusty Russell 已提交
150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
/* Find a module section, or NULL. */
static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
			  const char *secstrings, const char *name)
{
	/* Section 0 has sh_addr 0. */
	return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
}

/* Find a module section, or NULL.  Fill in number of "objects" in section. */
static void *section_objs(Elf_Ehdr *hdr,
			  Elf_Shdr *sechdrs,
			  const char *secstrings,
			  const char *name,
			  size_t object_size,
			  unsigned int *num)
{
	unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);

	/* Section 0 has sh_addr 0 and sh_size 0. */
	*num = sechdrs[sec].sh_size / object_size;
	return (void *)sechdrs[sec].sh_addr;
}

L
Linus Torvalds 已提交
173 174 175 176 177
/* Provided by the linker */
extern const struct kernel_symbol __start___ksymtab[];
extern const struct kernel_symbol __stop___ksymtab[];
extern const struct kernel_symbol __start___ksymtab_gpl[];
extern const struct kernel_symbol __stop___ksymtab_gpl[];
178 179
extern const struct kernel_symbol __start___ksymtab_gpl_future[];
extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
180 181
extern const struct kernel_symbol __start___ksymtab_gpl_future[];
extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
L
Linus Torvalds 已提交
182 183
extern const unsigned long __start___kcrctab[];
extern const unsigned long __start___kcrctab_gpl[];
184
extern const unsigned long __start___kcrctab_gpl_future[];
185 186 187 188 189
#ifdef CONFIG_UNUSED_SYMBOLS
extern const struct kernel_symbol __start___ksymtab_unused[];
extern const struct kernel_symbol __stop___ksymtab_unused[];
extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
190 191
extern const unsigned long __start___kcrctab_unused[];
extern const unsigned long __start___kcrctab_unused_gpl[];
192
#endif
L
Linus Torvalds 已提交
193 194 195 196

#ifndef CONFIG_MODVERSIONS
#define symversion(base, idx) NULL
#else
A
Andrew Morton 已提交
197
#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
L
Linus Torvalds 已提交
198 199
#endif

200 201 202 203 204 205 206
static bool each_symbol_in_section(const struct symsearch *arr,
				   unsigned int arrsize,
				   struct module *owner,
				   bool (*fn)(const struct symsearch *syms,
					      struct module *owner,
					      unsigned int symnum, void *data),
				   void *data)
207
{
208
	unsigned int i, j;
209

210 211 212 213
	for (j = 0; j < arrsize; j++) {
		for (i = 0; i < arr[j].stop - arr[j].start; i++)
			if (fn(&arr[j], owner, i, data))
				return true;
214
	}
215 216

	return false;
217 218
}

219
/* Returns true as soon as fn returns true, otherwise false. */
220 221
bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
			    unsigned int symnum, void *data), void *data)
222 223 224 225
{
	struct module *mod;
	const struct symsearch arr[] = {
		{ __start___ksymtab, __stop___ksymtab, __start___kcrctab,
226
		  NOT_GPL_ONLY, false },
227
		{ __start___ksymtab_gpl, __stop___ksymtab_gpl,
228 229
		  __start___kcrctab_gpl,
		  GPL_ONLY, false },
230
		{ __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
231 232
		  __start___kcrctab_gpl_future,
		  WILL_BE_GPL_ONLY, false },
233
#ifdef CONFIG_UNUSED_SYMBOLS
234
		{ __start___ksymtab_unused, __stop___ksymtab_unused,
235 236
		  __start___kcrctab_unused,
		  NOT_GPL_ONLY, true },
237
		{ __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
238 239
		  __start___kcrctab_unused_gpl,
		  GPL_ONLY, true },
240
#endif
241
	};
242

243 244
	if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
		return true;
245

246
	list_for_each_entry_rcu(mod, &modules, list) {
247 248
		struct symsearch arr[] = {
			{ mod->syms, mod->syms + mod->num_syms, mod->crcs,
249
			  NOT_GPL_ONLY, false },
250
			{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
251 252
			  mod->gpl_crcs,
			  GPL_ONLY, false },
253 254
			{ mod->gpl_future_syms,
			  mod->gpl_future_syms + mod->num_gpl_future_syms,
255 256
			  mod->gpl_future_crcs,
			  WILL_BE_GPL_ONLY, false },
257
#ifdef CONFIG_UNUSED_SYMBOLS
258 259
			{ mod->unused_syms,
			  mod->unused_syms + mod->num_unused_syms,
260 261
			  mod->unused_crcs,
			  NOT_GPL_ONLY, true },
262 263
			{ mod->unused_gpl_syms,
			  mod->unused_gpl_syms + mod->num_unused_gpl_syms,
264 265
			  mod->unused_gpl_crcs,
			  GPL_ONLY, true },
266
#endif
267 268
		};

269 270 271 272 273
		if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
			return true;
	}
	return false;
}
274
EXPORT_SYMBOL_GPL(each_symbol);
275 276 277 278 279 280 281 282 283 284

struct find_symbol_arg {
	/* Input */
	const char *name;
	bool gplok;
	bool warn;

	/* Output */
	struct module *owner;
	const unsigned long *crc;
285
	const struct kernel_symbol *sym;
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
};

static bool find_symbol_in_section(const struct symsearch *syms,
				   struct module *owner,
				   unsigned int symnum, void *data)
{
	struct find_symbol_arg *fsa = data;

	if (strcmp(syms->start[symnum].name, fsa->name) != 0)
		return false;

	if (!fsa->gplok) {
		if (syms->licence == GPL_ONLY)
			return false;
		if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
			printk(KERN_WARNING "Symbol %s is being used "
			       "by a non-GPL module, which will not "
			       "be allowed in the future\n", fsa->name);
			printk(KERN_WARNING "Please see the file "
			       "Documentation/feature-removal-schedule.txt "
			       "in the kernel source tree for more details.\n");
307
		}
L
Linus Torvalds 已提交
308
	}
309

310
#ifdef CONFIG_UNUSED_SYMBOLS
311 312 313 314 315 316 317 318 319 320 321
	if (syms->unused && fsa->warn) {
		printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
		       "however this module is using it.\n", fsa->name);
		printk(KERN_WARNING
		       "This symbol will go away in the future.\n");
		printk(KERN_WARNING
		       "Please evalute if this is the right api to use and if "
		       "it really is, submit a report the linux kernel "
		       "mailinglist together with submitting your code for "
		       "inclusion.\n");
	}
322
#endif
323 324 325

	fsa->owner = owner;
	fsa->crc = symversion(syms->crcs, symnum);
326
	fsa->sym = &syms->start[symnum];
327 328 329
	return true;
}

330 331
/* Find a symbol and return it, along with, (optional) crc and
 * (optional) module which owns it */
332 333 334 335 336
const struct kernel_symbol *find_symbol(const char *name,
					struct module **owner,
					const unsigned long **crc,
					bool gplok,
					bool warn)
337 338 339 340 341 342 343 344 345 346 347 348
{
	struct find_symbol_arg fsa;

	fsa.name = name;
	fsa.gplok = gplok;
	fsa.warn = warn;

	if (each_symbol(find_symbol_in_section, &fsa)) {
		if (owner)
			*owner = fsa.owner;
		if (crc)
			*crc = fsa.crc;
349
		return fsa.sym;
350 351
	}

L
Linus Torvalds 已提交
352
	DEBUGP("Failed to find symbol %s\n", name);
353
	return NULL;
L
Linus Torvalds 已提交
354
}
355
EXPORT_SYMBOL_GPL(find_symbol);
L
Linus Torvalds 已提交
356 357

/* Search for module by name: must hold module_mutex. */
358
struct module *find_module(const char *name)
L
Linus Torvalds 已提交
359 360 361 362 363 364 365 366 367
{
	struct module *mod;

	list_for_each_entry(mod, &modules, list) {
		if (strcmp(mod->name, name) == 0)
			return mod;
	}
	return NULL;
}
368
EXPORT_SYMBOL_GPL(find_module);
L
Linus Torvalds 已提交
369 370

#ifdef CONFIG_SMP
371

372
#ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
373 374 375 376 377 378 379 380 381 382 383 384

static void *percpu_modalloc(unsigned long size, unsigned long align,
			     const char *name)
{
	void *ptr;

	if (align > PAGE_SIZE) {
		printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
		       name, align, PAGE_SIZE);
		align = PAGE_SIZE;
	}

385
	ptr = __alloc_reserved_percpu(size, align);
386 387 388 389 390 391 392 393 394 395 396
	if (!ptr)
		printk(KERN_WARNING
		       "Could not allocate %lu bytes percpu data\n", size);
	return ptr;
}

static void percpu_modfree(void *freeme)
{
	free_percpu(freeme);
}

397
#else /* ... CONFIG_HAVE_LEGACY_PER_CPU_AREA */
398

L
Linus Torvalds 已提交
399 400 401 402 403 404 405 406 407
/* Number of blocks used and allocated. */
static unsigned int pcpu_num_used, pcpu_num_allocated;
/* Size of each block.  -ve means used. */
static int *pcpu_size;

static int split_block(unsigned int i, unsigned short size)
{
	/* Reallocation required? */
	if (pcpu_num_used + 1 > pcpu_num_allocated) {
P
Pekka Enberg 已提交
408 409 410 411
		int *new;

		new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
			       GFP_KERNEL);
L
Linus Torvalds 已提交
412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435
		if (!new)
			return 0;

		pcpu_num_allocated *= 2;
		pcpu_size = new;
	}

	/* Insert a new subblock */
	memmove(&pcpu_size[i+1], &pcpu_size[i],
		sizeof(pcpu_size[0]) * (pcpu_num_used - i));
	pcpu_num_used++;

	pcpu_size[i+1] -= size;
	pcpu_size[i] = size;
	return 1;
}

static inline unsigned int block_size(int val)
{
	if (val < 0)
		return -val;
	return val;
}

436 437
static void *percpu_modalloc(unsigned long size, unsigned long align,
			     const char *name)
L
Linus Torvalds 已提交
438 439 440 441
{
	unsigned long extra;
	unsigned int i;
	void *ptr;
C
Catalin Marinas 已提交
442
	int cpu;
L
Linus Torvalds 已提交
443

444 445 446 447
	if (align > PAGE_SIZE) {
		printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
		       name, align, PAGE_SIZE);
		align = PAGE_SIZE;
448
	}
L
Linus Torvalds 已提交
449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471

	ptr = __per_cpu_start;
	for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
		/* Extra for alignment requirement. */
		extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
		BUG_ON(i == 0 && extra != 0);

		if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
			continue;

		/* Transfer extra to previous block. */
		if (pcpu_size[i-1] < 0)
			pcpu_size[i-1] -= extra;
		else
			pcpu_size[i-1] += extra;
		pcpu_size[i] -= extra;
		ptr += extra;

		/* Split block if warranted */
		if (pcpu_size[i] - size > sizeof(unsigned long))
			if (!split_block(i, size))
				return NULL;

C
Catalin Marinas 已提交
472 473 474 475 476
		/* add the per-cpu scanning areas */
		for_each_possible_cpu(cpu)
			kmemleak_alloc(ptr + per_cpu_offset(cpu), size, 0,
				       GFP_KERNEL);

L
Linus Torvalds 已提交
477 478 479 480 481 482 483 484 485 486 487 488 489 490
		/* Mark allocated */
		pcpu_size[i] = -pcpu_size[i];
		return ptr;
	}

	printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
	       size);
	return NULL;
}

static void percpu_modfree(void *freeme)
{
	unsigned int i;
	void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
C
Catalin Marinas 已提交
491
	int cpu;
L
Linus Torvalds 已提交
492 493 494 495 496 497 498 499 500 501 502

	/* First entry is core kernel percpu data. */
	for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
		if (ptr == freeme) {
			pcpu_size[i] = -pcpu_size[i];
			goto free;
		}
	}
	BUG();

 free:
C
Catalin Marinas 已提交
503 504 505 506
	/* remove the per-cpu scanning areas */
	for_each_possible_cpu(cpu)
		kmemleak_free(freeme + per_cpu_offset(cpu));

L
Linus Torvalds 已提交
507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530
	/* Merge with previous? */
	if (pcpu_size[i-1] >= 0) {
		pcpu_size[i-1] += pcpu_size[i];
		pcpu_num_used--;
		memmove(&pcpu_size[i], &pcpu_size[i+1],
			(pcpu_num_used - i) * sizeof(pcpu_size[0]));
		i--;
	}
	/* Merge with next? */
	if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
		pcpu_size[i] += pcpu_size[i+1];
		pcpu_num_used--;
		memmove(&pcpu_size[i+1], &pcpu_size[i+2],
			(pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
	}
}

static int percpu_modinit(void)
{
	pcpu_num_used = 2;
	pcpu_num_allocated = 2;
	pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
			    GFP_KERNEL);
	/* Static in-kernel percpu data (used). */
531
	pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
L
Linus Torvalds 已提交
532 533 534 535 536 537 538 539
	/* Free room. */
	pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
	if (pcpu_size[1] < 0) {
		printk(KERN_ERR "No per-cpu room for modules.\n");
		pcpu_num_used = 1;
	}

	return 0;
D
Daniel Walker 已提交
540
}
L
Linus Torvalds 已提交
541
__initcall(percpu_modinit);
542

543
#endif /* CONFIG_HAVE_LEGACY_PER_CPU_AREA */
544

545 546 547 548 549 550 551 552 553 554 555 556 557 558 559
static unsigned int find_pcpusec(Elf_Ehdr *hdr,
				 Elf_Shdr *sechdrs,
				 const char *secstrings)
{
	return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
}

static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
{
	int cpu;

	for_each_possible_cpu(cpu)
		memcpy(pcpudest + per_cpu_offset(cpu), from, size);
}

L
Linus Torvalds 已提交
560
#else /* ... !CONFIG_SMP */
561

562 563
static inline void *percpu_modalloc(unsigned long size, unsigned long align,
				    const char *name)
L
Linus Torvalds 已提交
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582
{
	return NULL;
}
static inline void percpu_modfree(void *pcpuptr)
{
	BUG();
}
static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
					Elf_Shdr *sechdrs,
					const char *secstrings)
{
	return 0;
}
static inline void percpu_modcopy(void *pcpudst, const void *src,
				  unsigned long size)
{
	/* pcpusec should be 0, and size of that section should be 0. */
	BUG_ON(size != 0);
}
583

L
Linus Torvalds 已提交
584 585
#endif /* CONFIG_SMP */

586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
#define MODINFO_ATTR(field)	\
static void setup_modinfo_##field(struct module *mod, const char *s)  \
{                                                                     \
	mod->field = kstrdup(s, GFP_KERNEL);                          \
}                                                                     \
static ssize_t show_modinfo_##field(struct module_attribute *mattr,   \
	                struct module *mod, char *buffer)             \
{                                                                     \
	return sprintf(buffer, "%s\n", mod->field);                   \
}                                                                     \
static int modinfo_##field##_exists(struct module *mod)               \
{                                                                     \
	return mod->field != NULL;                                    \
}                                                                     \
static void free_modinfo_##field(struct module *mod)                  \
{                                                                     \
D
Daniel Walker 已提交
602 603
	kfree(mod->field);                                            \
	mod->field = NULL;                                            \
604 605
}                                                                     \
static struct module_attribute modinfo_##field = {                    \
606
	.attr = { .name = __stringify(field), .mode = 0444 },         \
607 608 609 610 611 612 613 614 615
	.show = show_modinfo_##field,                                 \
	.setup = setup_modinfo_##field,                               \
	.test = modinfo_##field##_exists,                             \
	.free = free_modinfo_##field,                                 \
};

MODINFO_ATTR(version);
MODINFO_ATTR(srcversion);

616 617
static char last_unloaded_module[MODULE_NAME_LEN+1];

618
#ifdef CONFIG_MODULE_UNLOAD
L
Linus Torvalds 已提交
619 620 621
/* Init the unload section of the module. */
static void module_unload_init(struct module *mod)
{
622
	int cpu;
L
Linus Torvalds 已提交
623 624

	INIT_LIST_HEAD(&mod->modules_which_use_me);
625 626
	for_each_possible_cpu(cpu)
		local_set(__module_ref_addr(mod, cpu), 0);
L
Linus Torvalds 已提交
627
	/* Hold reference count during initialization. */
628
	local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
L
Linus Torvalds 已提交
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655
	/* Backwards compatibility macros put refcount during init. */
	mod->waiter = current;
}

/* modules using other modules */
struct module_use
{
	struct list_head list;
	struct module *module_which_uses;
};

/* Does a already use b? */
static int already_uses(struct module *a, struct module *b)
{
	struct module_use *use;

	list_for_each_entry(use, &b->modules_which_use_me, list) {
		if (use->module_which_uses == a) {
			DEBUGP("%s uses %s!\n", a->name, b->name);
			return 1;
		}
	}
	DEBUGP("%s does not use %s!\n", a->name, b->name);
	return 0;
}

/* Module a uses b */
656
int use_module(struct module *a, struct module *b)
L
Linus Torvalds 已提交
657 658
{
	struct module_use *use;
659
	int no_warn, err;
K
Kay Sievers 已提交
660

L
Linus Torvalds 已提交
661 662
	if (b == NULL || already_uses(a, b)) return 1;

663 664 665 666 667 668 669 670 671 672 673
	/* If we're interrupted or time out, we fail. */
	if (wait_event_interruptible_timeout(
		    module_wq, (err = strong_try_module_get(b)) != -EBUSY,
		    30 * HZ) <= 0) {
		printk("%s: gave up waiting for init of module %s.\n",
		       a->name, b->name);
		return 0;
	}

	/* If strong_try_module_get() returned a different error, we fail. */
	if (err)
L
Linus Torvalds 已提交
674 675 676 677 678 679 680 681 682 683 684 685
		return 0;

	DEBUGP("Allocating new usage for %s.\n", a->name);
	use = kmalloc(sizeof(*use), GFP_ATOMIC);
	if (!use) {
		printk("%s: out of memory loading\n", a->name);
		module_put(b);
		return 0;
	}

	use->module_which_uses = a;
	list_add(&use->list, &b->modules_which_use_me);
K
Kay Sievers 已提交
686
	no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
L
Linus Torvalds 已提交
687 688
	return 1;
}
689
EXPORT_SYMBOL_GPL(use_module);
L
Linus Torvalds 已提交
690 691 692 693 694 695 696 697 698 699 700 701 702 703 704

/* Clear the unload stuff of the module. */
static void module_unload_free(struct module *mod)
{
	struct module *i;

	list_for_each_entry(i, &modules, list) {
		struct module_use *use;

		list_for_each_entry(use, &i->modules_which_use_me, list) {
			if (use->module_which_uses == mod) {
				DEBUGP("%s unusing %s\n", mod->name, i->name);
				module_put(i);
				list_del(&use->list);
				kfree(use);
K
Kay Sievers 已提交
705
				sysfs_remove_link(i->holders_dir, mod->name);
L
Linus Torvalds 已提交
706 707 708 709 710 711 712 713
				/* There can be at most one match. */
				break;
			}
		}
	}
}

#ifdef CONFIG_MODULE_FORCE_UNLOAD
714
static inline int try_force_unload(unsigned int flags)
L
Linus Torvalds 已提交
715 716 717
{
	int ret = (flags & O_TRUNC);
	if (ret)
718
		add_taint(TAINT_FORCED_RMMOD);
L
Linus Torvalds 已提交
719 720 721
	return ret;
}
#else
722
static inline int try_force_unload(unsigned int flags)
L
Linus Torvalds 已提交
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
{
	return 0;
}
#endif /* CONFIG_MODULE_FORCE_UNLOAD */

struct stopref
{
	struct module *mod;
	int flags;
	int *forced;
};

/* Whole machine is stopped with interrupts off when this runs. */
static int __try_stop_module(void *_sref)
{
	struct stopref *sref = _sref;

740 741
	/* If it's not unused, quit unless we're forcing. */
	if (module_refcount(sref->mod) != 0) {
742
		if (!(*sref->forced = try_force_unload(sref->flags)))
L
Linus Torvalds 已提交
743 744 745 746 747 748 749 750 751 752
			return -EWOULDBLOCK;
	}

	/* Mark it as dying. */
	sref->mod->state = MODULE_STATE_GOING;
	return 0;
}

static int try_stop_module(struct module *mod, int flags, int *forced)
{
753 754
	if (flags & O_NONBLOCK) {
		struct stopref sref = { mod, flags, forced };
L
Linus Torvalds 已提交
755

756
		return stop_machine(__try_stop_module, &sref, NULL);
757 758 759 760 761 762
	} else {
		/* We don't need to stop the machine for this. */
		mod->state = MODULE_STATE_GOING;
		synchronize_sched();
		return 0;
	}
L
Linus Torvalds 已提交
763 764 765 766
}

unsigned int module_refcount(struct module *mod)
{
767 768
	unsigned int total = 0;
	int cpu;
L
Linus Torvalds 已提交
769

770 771
	for_each_possible_cpu(cpu)
		total += local_read(__module_ref_addr(mod, cpu));
L
Linus Torvalds 已提交
772 773 774 775 776 777 778 779 780
	return total;
}
EXPORT_SYMBOL(module_refcount);

/* This exists whether we can unload or not */
static void free_module(struct module *mod);

static void wait_for_zero_refcount(struct module *mod)
{
781
	/* Since we might sleep for some time, release the mutex first */
782
	mutex_unlock(&module_mutex);
L
Linus Torvalds 已提交
783 784 785 786 787 788 789 790
	for (;;) {
		DEBUGP("Looking at refcount...\n");
		set_current_state(TASK_UNINTERRUPTIBLE);
		if (module_refcount(mod) == 0)
			break;
		schedule();
	}
	current->state = TASK_RUNNING;
791
	mutex_lock(&module_mutex);
L
Linus Torvalds 已提交
792 793
}

794 795
SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
		unsigned int, flags)
L
Linus Torvalds 已提交
796 797
{
	struct module *mod;
798
	char name[MODULE_NAME_LEN];
L
Linus Torvalds 已提交
799 800
	int ret, forced = 0;

801
	if (!capable(CAP_SYS_MODULE) || modules_disabled)
802 803 804 805 806 807
		return -EPERM;

	if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
		return -EFAULT;
	name[MODULE_NAME_LEN-1] = '\0';

808 809 810 811 812 813 814 815 816 817
	/* Create stop_machine threads since free_module relies on
	 * a non-failing stop_machine call. */
	ret = stop_machine_create();
	if (ret)
		return ret;

	if (mutex_lock_interruptible(&module_mutex) != 0) {
		ret = -EINTR;
		goto out_stop;
	}
L
Linus Torvalds 已提交
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840

	mod = find_module(name);
	if (!mod) {
		ret = -ENOENT;
		goto out;
	}

	if (!list_empty(&mod->modules_which_use_me)) {
		/* Other modules depend on us: get rid of them first. */
		ret = -EWOULDBLOCK;
		goto out;
	}

	/* Doing init or already dying? */
	if (mod->state != MODULE_STATE_LIVE) {
		/* FIXME: if (force), slam module count and wake up
                   waiter --RR */
		DEBUGP("%s already dying\n", mod->name);
		ret = -EBUSY;
		goto out;
	}

	/* If it has an init func, it must have an exit func to unload */
R
Rusty Russell 已提交
841
	if (mod->init && !mod->exit) {
842
		forced = try_force_unload(flags);
L
Linus Torvalds 已提交
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861
		if (!forced) {
			/* This module can't be removed */
			ret = -EBUSY;
			goto out;
		}
	}

	/* Set this up before setting mod->state */
	mod->waiter = current;

	/* Stop the machine so refcounts can't move and disable module. */
	ret = try_stop_module(mod, flags, &forced);
	if (ret != 0)
		goto out;

	/* Never wait if forced. */
	if (!forced && module_refcount(mod) != 0)
		wait_for_zero_refcount(mod);

862
	mutex_unlock(&module_mutex);
L
Linus Torvalds 已提交
863
	/* Final destruction now noone is using it. */
864
	if (mod->exit != NULL)
L
Linus Torvalds 已提交
865
		mod->exit();
866 867
	blocking_notifier_call_chain(&module_notify_list,
				     MODULE_STATE_GOING, mod);
868
	async_synchronize_full();
869
	mutex_lock(&module_mutex);
870
	/* Store the name of the last unloaded module for diagnostic purposes */
871
	strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
872
	ddebug_remove_module(mod->name);
L
Linus Torvalds 已提交
873 874 875
	free_module(mod);

 out:
876
	mutex_unlock(&module_mutex);
877 878
out_stop:
	stop_machine_destroy();
L
Linus Torvalds 已提交
879 880 881
	return ret;
}

882
static inline void print_unload_info(struct seq_file *m, struct module *mod)
L
Linus Torvalds 已提交
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
{
	struct module_use *use;
	int printed_something = 0;

	seq_printf(m, " %u ", module_refcount(mod));

	/* Always include a trailing , so userspace can differentiate
           between this and the old multi-field proc format. */
	list_for_each_entry(use, &mod->modules_which_use_me, list) {
		printed_something = 1;
		seq_printf(m, "%s,", use->module_which_uses->name);
	}

	if (mod->init != NULL && mod->exit == NULL) {
		printed_something = 1;
		seq_printf(m, "[permanent],");
	}

	if (!printed_something)
		seq_printf(m, "-");
}

void __symbol_put(const char *symbol)
{
	struct module *owner;

R
Rusty Russell 已提交
909
	preempt_disable();
910
	if (!find_symbol(symbol, &owner, NULL, true, false))
L
Linus Torvalds 已提交
911 912
		BUG();
	module_put(owner);
R
Rusty Russell 已提交
913
	preempt_enable();
L
Linus Torvalds 已提交
914 915 916
}
EXPORT_SYMBOL(__symbol_put);

917
/* Note this assumes addr is a function, which it currently always is. */
L
Linus Torvalds 已提交
918 919
void symbol_put_addr(void *addr)
{
920
	struct module *modaddr;
921
	unsigned long a = (unsigned long)dereference_function_descriptor(addr);
L
Linus Torvalds 已提交
922

923
	if (core_kernel_text(a))
924
		return;
L
Linus Torvalds 已提交
925

926 927
	/* module_text_address is safe here: we're supposed to have reference
	 * to module from symbol_get, so it can't go away. */
928
	modaddr = __module_text_address(a);
929
	BUG_ON(!modaddr);
930
	module_put(modaddr);
L
Linus Torvalds 已提交
931 932 933 934 935 936
}
EXPORT_SYMBOL_GPL(symbol_put_addr);

static ssize_t show_refcnt(struct module_attribute *mattr,
			   struct module *mod, char *buffer)
{
937
	return sprintf(buffer, "%u\n", module_refcount(mod));
L
Linus Torvalds 已提交
938 939 940
}

static struct module_attribute refcnt = {
941
	.attr = { .name = "refcnt", .mode = 0444 },
L
Linus Torvalds 已提交
942 943 944
	.show = show_refcnt,
};

A
Al Viro 已提交
945 946 947 948
void module_put(struct module *module)
{
	if (module) {
		unsigned int cpu = get_cpu();
949
		local_dec(__module_ref_addr(module, cpu));
950 951
		trace_module_put(module, _RET_IP_,
				 local_read(__module_ref_addr(module, cpu)));
A
Al Viro 已提交
952 953 954 955 956 957 958 959
		/* Maybe they're waiting for us to drop reference? */
		if (unlikely(!module_is_live(module)))
			wake_up_process(module->waiter);
		put_cpu();
	}
}
EXPORT_SYMBOL(module_put);

L
Linus Torvalds 已提交
960
#else /* !CONFIG_MODULE_UNLOAD */
961
static inline void print_unload_info(struct seq_file *m, struct module *mod)
L
Linus Torvalds 已提交
962 963 964 965 966 967 968 969 970
{
	/* We don't know the usage count, or what modules are using. */
	seq_printf(m, " - -");
}

static inline void module_unload_free(struct module *mod)
{
}

971
int use_module(struct module *a, struct module *b)
L
Linus Torvalds 已提交
972
{
973
	return strong_try_module_get(b) == 0;
L
Linus Torvalds 已提交
974
}
975
EXPORT_SYMBOL_GPL(use_module);
L
Linus Torvalds 已提交
976 977 978 979 980 981

static inline void module_unload_init(struct module *mod)
{
}
#endif /* CONFIG_MODULE_UNLOAD */

982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
static ssize_t show_initstate(struct module_attribute *mattr,
			   struct module *mod, char *buffer)
{
	const char *state = "unknown";

	switch (mod->state) {
	case MODULE_STATE_LIVE:
		state = "live";
		break;
	case MODULE_STATE_COMING:
		state = "coming";
		break;
	case MODULE_STATE_GOING:
		state = "going";
		break;
	}
	return sprintf(buffer, "%s\n", state);
}

static struct module_attribute initstate = {
1002
	.attr = { .name = "initstate", .mode = 0444 },
1003 1004 1005
	.show = show_initstate,
};

1006 1007 1008
static struct module_attribute *modinfo_attrs[] = {
	&modinfo_version,
	&modinfo_srcversion,
1009
	&initstate,
1010 1011 1012 1013 1014 1015
#ifdef CONFIG_MODULE_UNLOAD
	&refcnt,
#endif
	NULL,
};

L
Linus Torvalds 已提交
1016 1017
static const char vermagic[] = VERMAGIC_STRING;

1018
static int try_to_force_load(struct module *mod, const char *reason)
1019 1020
{
#ifdef CONFIG_MODULE_FORCE_LOAD
A
Andi Kleen 已提交
1021
	if (!test_taint(TAINT_FORCED_MODULE))
1022 1023
		printk(KERN_WARNING "%s: %s: kernel tainted.\n",
		       mod->name, reason);
1024 1025 1026 1027 1028 1029 1030
	add_taint_module(mod, TAINT_FORCED_MODULE);
	return 0;
#else
	return -ENOEXEC;
#endif
}

L
Linus Torvalds 已提交
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
#ifdef CONFIG_MODVERSIONS
static int check_version(Elf_Shdr *sechdrs,
			 unsigned int versindex,
			 const char *symname,
			 struct module *mod, 
			 const unsigned long *crc)
{
	unsigned int i, num_versions;
	struct modversion_info *versions;

	/* Exporting module didn't supply crcs?  OK, we're already tainted. */
	if (!crc)
		return 1;

1045 1046 1047 1048
	/* No versions at all?  modprobe --force does this. */
	if (versindex == 0)
		return try_to_force_load(mod, symname) == 0;

L
Linus Torvalds 已提交
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
	versions = (void *) sechdrs[versindex].sh_addr;
	num_versions = sechdrs[versindex].sh_size
		/ sizeof(struct modversion_info);

	for (i = 0; i < num_versions; i++) {
		if (strcmp(versions[i].name, symname) != 0)
			continue;

		if (versions[i].crc == *crc)
			return 1;
		DEBUGP("Found checksum %lX vs module %lX\n",
		       *crc, versions[i].crc);
1061
		goto bad_version;
L
Linus Torvalds 已提交
1062
	}
1063

1064 1065 1066
	printk(KERN_WARNING "%s: no symbol version for %s\n",
	       mod->name, symname);
	return 0;
1067 1068 1069 1070 1071

bad_version:
	printk("%s: disagrees about version of symbol %s\n",
	       mod->name, symname);
	return 0;
L
Linus Torvalds 已提交
1072 1073 1074 1075 1076 1077 1078 1079
}

static inline int check_modstruct_version(Elf_Shdr *sechdrs,
					  unsigned int versindex,
					  struct module *mod)
{
	const unsigned long *crc;

1080 1081
	if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
			 &crc, true, false))
L
Linus Torvalds 已提交
1082
		BUG();
1083
	return check_version(sechdrs, versindex, "module_layout", mod, crc);
L
Linus Torvalds 已提交
1084 1085
}

1086 1087 1088
/* First part is kernel version, which we ignore if module has crcs. */
static inline int same_magic(const char *amagic, const char *bmagic,
			     bool has_crcs)
L
Linus Torvalds 已提交
1089
{
1090 1091 1092 1093
	if (has_crcs) {
		amagic += strcspn(amagic, " ");
		bmagic += strcspn(bmagic, " ");
	}
L
Linus Torvalds 已提交
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	return strcmp(amagic, bmagic) == 0;
}
#else
static inline int check_version(Elf_Shdr *sechdrs,
				unsigned int versindex,
				const char *symname,
				struct module *mod, 
				const unsigned long *crc)
{
	return 1;
}

static inline int check_modstruct_version(Elf_Shdr *sechdrs,
					  unsigned int versindex,
					  struct module *mod)
{
	return 1;
}

1113 1114
static inline int same_magic(const char *amagic, const char *bmagic,
			     bool has_crcs)
L
Linus Torvalds 已提交
1115 1116 1117 1118 1119 1120 1121
{
	return strcmp(amagic, bmagic) == 0;
}
#endif /* CONFIG_MODVERSIONS */

/* Resolve a symbol for this module.  I.e. if we find one, record usage.
   Must be holding module_mutex. */
1122 1123 1124 1125
static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
						  unsigned int versindex,
						  const char *name,
						  struct module *mod)
L
Linus Torvalds 已提交
1126 1127
{
	struct module *owner;
1128
	const struct kernel_symbol *sym;
L
Linus Torvalds 已提交
1129 1130
	const unsigned long *crc;

1131
	sym = find_symbol(name, &owner, &crc,
A
Andi Kleen 已提交
1132
			  !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1133 1134 1135
	/* use_module can fail due to OOM,
	   or module initialization or unloading */
	if (sym) {
L
Linus Torvalds 已提交
1136 1137
		if (!check_version(sechdrs, versindex, name, mod, crc) ||
		    !use_module(mod, owner))
1138
			sym = NULL;
L
Linus Torvalds 已提交
1139
	}
1140
	return sym;
L
Linus Torvalds 已提交
1141 1142 1143 1144 1145 1146
}

/*
 * /sys/module/foo/sections stuff
 * J. Corbet <corbet@lwn.net>
 */
1147
#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
struct module_sect_attr
{
	struct module_attribute mattr;
	char *name;
	unsigned long address;
};

struct module_sect_attrs
{
	struct attribute_group grp;
	unsigned int nsections;
	struct module_sect_attr attrs[0];
};

L
Linus Torvalds 已提交
1162 1163 1164 1165 1166 1167 1168 1169
static ssize_t module_sect_show(struct module_attribute *mattr,
				struct module *mod, char *buf)
{
	struct module_sect_attr *sattr =
		container_of(mattr, struct module_sect_attr, mattr);
	return sprintf(buf, "0x%lx\n", sattr->address);
}

1170 1171
static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
{
1172
	unsigned int section;
1173 1174 1175 1176 1177 1178

	for (section = 0; section < sect_attrs->nsections; section++)
		kfree(sect_attrs->attrs[section].name);
	kfree(sect_attrs);
}

L
Linus Torvalds 已提交
1179 1180 1181 1182 1183 1184 1185
static void add_sect_attrs(struct module *mod, unsigned int nsect,
		char *secstrings, Elf_Shdr *sechdrs)
{
	unsigned int nloaded = 0, i, size[2];
	struct module_sect_attrs *sect_attrs;
	struct module_sect_attr *sattr;
	struct attribute **gattr;
D
Daniel Walker 已提交
1186

L
Linus Torvalds 已提交
1187 1188 1189 1190 1191 1192 1193 1194
	/* Count loaded sections and allocate structures */
	for (i = 0; i < nsect; i++)
		if (sechdrs[i].sh_flags & SHF_ALLOC)
			nloaded++;
	size[0] = ALIGN(sizeof(*sect_attrs)
			+ nloaded * sizeof(sect_attrs->attrs[0]),
			sizeof(sect_attrs->grp.attrs[0]));
	size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1195 1196
	sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
	if (sect_attrs == NULL)
L
Linus Torvalds 已提交
1197 1198 1199 1200 1201 1202
		return;

	/* Setup section attributes. */
	sect_attrs->grp.name = "sections";
	sect_attrs->grp.attrs = (void *)sect_attrs + size[0];

1203
	sect_attrs->nsections = 0;
L
Linus Torvalds 已提交
1204 1205 1206 1207 1208 1209
	sattr = &sect_attrs->attrs[0];
	gattr = &sect_attrs->grp.attrs[0];
	for (i = 0; i < nsect; i++) {
		if (! (sechdrs[i].sh_flags & SHF_ALLOC))
			continue;
		sattr->address = sechdrs[i].sh_addr;
1210 1211 1212 1213 1214
		sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
					GFP_KERNEL);
		if (sattr->name == NULL)
			goto out;
		sect_attrs->nsections++;
L
Linus Torvalds 已提交
1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
		sattr->mattr.show = module_sect_show;
		sattr->mattr.store = NULL;
		sattr->mattr.attr.name = sattr->name;
		sattr->mattr.attr.mode = S_IRUGO;
		*(gattr++) = &(sattr++)->mattr.attr;
	}
	*gattr = NULL;

	if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
		goto out;

	mod->sect_attrs = sect_attrs;
	return;
  out:
1229
	free_sect_attrs(sect_attrs);
L
Linus Torvalds 已提交
1230 1231 1232 1233 1234 1235 1236 1237 1238
}

static void remove_sect_attrs(struct module *mod)
{
	if (mod->sect_attrs) {
		sysfs_remove_group(&mod->mkobj.kobj,
				   &mod->sect_attrs->grp);
		/* We are positive that no one is using any sect attrs
		 * at this point.  Deallocate immediately. */
1239
		free_sect_attrs(mod->sect_attrs);
L
Linus Torvalds 已提交
1240 1241 1242 1243
		mod->sect_attrs = NULL;
	}
}

R
Roland McGrath 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
/*
 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
 */

struct module_notes_attrs {
	struct kobject *dir;
	unsigned int notes;
	struct bin_attribute attrs[0];
};

static ssize_t module_notes_read(struct kobject *kobj,
				 struct bin_attribute *bin_attr,
				 char *buf, loff_t pos, size_t count)
{
	/*
	 * The caller checked the pos and count against our size.
	 */
	memcpy(buf, bin_attr->private + pos, count);
	return count;
}

static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
			     unsigned int i)
{
	if (notes_attrs->dir) {
		while (i-- > 0)
			sysfs_remove_bin_file(notes_attrs->dir,
					      &notes_attrs->attrs[i]);
1272
		kobject_put(notes_attrs->dir);
R
Roland McGrath 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
	}
	kfree(notes_attrs);
}

static void add_notes_attrs(struct module *mod, unsigned int nsect,
			    char *secstrings, Elf_Shdr *sechdrs)
{
	unsigned int notes, loaded, i;
	struct module_notes_attrs *notes_attrs;
	struct bin_attribute *nattr;

1284 1285 1286 1287
	/* failed to create section attributes, so can't create notes */
	if (!mod->sect_attrs)
		return;

R
Roland McGrath 已提交
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
	/* Count notes sections and allocate structures.  */
	notes = 0;
	for (i = 0; i < nsect; i++)
		if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
		    (sechdrs[i].sh_type == SHT_NOTE))
			++notes;

	if (notes == 0)
		return;

	notes_attrs = kzalloc(sizeof(*notes_attrs)
			      + notes * sizeof(notes_attrs->attrs[0]),
			      GFP_KERNEL);
	if (notes_attrs == NULL)
		return;

	notes_attrs->notes = notes;
	nattr = &notes_attrs->attrs[0];
	for (loaded = i = 0; i < nsect; ++i) {
		if (!(sechdrs[i].sh_flags & SHF_ALLOC))
			continue;
		if (sechdrs[i].sh_type == SHT_NOTE) {
			nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
			nattr->attr.mode = S_IRUGO;
			nattr->size = sechdrs[i].sh_size;
			nattr->private = (void *) sechdrs[i].sh_addr;
			nattr->read = module_notes_read;
			++nattr;
		}
		++loaded;
	}

1320
	notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
R
Roland McGrath 已提交
1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
	if (!notes_attrs->dir)
		goto out;

	for (i = 0; i < notes; ++i)
		if (sysfs_create_bin_file(notes_attrs->dir,
					  &notes_attrs->attrs[i]))
			goto out;

	mod->notes_attrs = notes_attrs;
	return;

  out:
	free_notes_attrs(notes_attrs, i);
}

static void remove_notes_attrs(struct module *mod)
{
	if (mod->notes_attrs)
		free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
}

L
Linus Torvalds 已提交
1342
#else
1343

L
Linus Torvalds 已提交
1344 1345 1346 1347 1348 1349 1350 1351
static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
		char *sectstrings, Elf_Shdr *sechdrs)
{
}

static inline void remove_sect_attrs(struct module *mod)
{
}
R
Roland McGrath 已提交
1352 1353 1354 1355 1356 1357 1358 1359 1360

static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
				   char *sectstrings, Elf_Shdr *sechdrs)
{
}

static inline void remove_notes_attrs(struct module *mod)
{
}
1361
#endif
L
Linus Torvalds 已提交
1362

1363 1364
#ifdef CONFIG_SYSFS
int module_add_modinfo_attrs(struct module *mod)
1365 1366
{
	struct module_attribute *attr;
1367
	struct module_attribute *temp_attr;
1368 1369 1370
	int error = 0;
	int i;

1371 1372 1373 1374 1375 1376 1377
	mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
					(ARRAY_SIZE(modinfo_attrs) + 1)),
					GFP_KERNEL);
	if (!mod->modinfo_attrs)
		return -ENOMEM;

	temp_attr = mod->modinfo_attrs;
1378 1379
	for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
		if (!attr->test ||
1380 1381 1382 1383 1384
		    (attr->test && attr->test(mod))) {
			memcpy(temp_attr, attr, sizeof(*temp_attr));
			error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
			++temp_attr;
		}
1385 1386 1387 1388
	}
	return error;
}

1389
void module_remove_modinfo_attrs(struct module *mod)
1390 1391 1392 1393
{
	struct module_attribute *attr;
	int i;

1394 1395 1396 1397
	for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
		/* pick a field to test for end of list */
		if (!attr->attr.name)
			break;
1398
		sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1399 1400
		if (attr->free)
			attr->free(mod);
1401
	}
1402
	kfree(mod->modinfo_attrs);
1403
}
L
Linus Torvalds 已提交
1404

1405
int mod_sysfs_init(struct module *mod)
L
Linus Torvalds 已提交
1406 1407
{
	int err;
1408
	struct kobject *kobj;
L
Linus Torvalds 已提交
1409

1410 1411
	if (!module_sysfs_initialized) {
		printk(KERN_ERR "%s: module sysfs not initialized\n",
1412 1413 1414 1415
		       mod->name);
		err = -EINVAL;
		goto out;
	}
1416 1417 1418 1419 1420 1421 1422 1423 1424

	kobj = kset_find_obj(module_kset, mod->name);
	if (kobj) {
		printk(KERN_ERR "%s: module is already loaded\n", mod->name);
		kobject_put(kobj);
		err = -EINVAL;
		goto out;
	}

L
Linus Torvalds 已提交
1425
	mod->mkobj.mod = mod;
1426

1427 1428 1429 1430 1431 1432
	memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
	mod->mkobj.kobj.kset = module_kset;
	err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
				   "%s", mod->name);
	if (err)
		kobject_put(&mod->mkobj.kobj);
K
Kay Sievers 已提交
1433

1434
	/* delay uevent until full sysfs population */
K
Kay Sievers 已提交
1435 1436 1437 1438
out:
	return err;
}

1439
int mod_sysfs_setup(struct module *mod,
K
Kay Sievers 已提交
1440 1441 1442 1443 1444
			   struct kernel_param *kparam,
			   unsigned int num_params)
{
	int err;

1445
	mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1446 1447
	if (!mod->holders_dir) {
		err = -ENOMEM;
K
Kay Sievers 已提交
1448
		goto out_unreg;
1449
	}
K
Kay Sievers 已提交
1450

L
Linus Torvalds 已提交
1451 1452
	err = module_param_sysfs_setup(mod, kparam, num_params);
	if (err)
K
Kay Sievers 已提交
1453
		goto out_unreg_holders;
L
Linus Torvalds 已提交
1454

1455 1456
	err = module_add_modinfo_attrs(mod);
	if (err)
1457
		goto out_unreg_param;
1458

1459
	kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
L
Linus Torvalds 已提交
1460 1461
	return 0;

1462 1463
out_unreg_param:
	module_param_sysfs_remove(mod);
K
Kay Sievers 已提交
1464
out_unreg_holders:
1465
	kobject_put(mod->holders_dir);
K
Kay Sievers 已提交
1466
out_unreg:
1467
	kobject_put(&mod->mkobj.kobj);
L
Linus Torvalds 已提交
1468 1469
	return err;
}
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482

static void mod_sysfs_fini(struct module *mod)
{
	kobject_put(&mod->mkobj.kobj);
}

#else /* CONFIG_SYSFS */

static void mod_sysfs_fini(struct module *mod)
{
}

#endif /* CONFIG_SYSFS */
L
Linus Torvalds 已提交
1483 1484 1485

static void mod_kobject_remove(struct module *mod)
{
1486
	module_remove_modinfo_attrs(mod);
L
Linus Torvalds 已提交
1487
	module_param_sysfs_remove(mod);
1488 1489
	kobject_put(mod->mkobj.drivers_dir);
	kobject_put(mod->holders_dir);
1490
	mod_sysfs_fini(mod);
L
Linus Torvalds 已提交
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
}

/*
 * unlink the module with the whole machine is stopped with interrupts off
 * - this defends against kallsyms not taking locks
 */
static int __unlink_module(void *_mod)
{
	struct module *mod = _mod;
	list_del(&mod->list);
	return 0;
}

1504
/* Free a module, remove from lists, etc (must hold module_mutex). */
L
Linus Torvalds 已提交
1505 1506
static void free_module(struct module *mod)
{
1507 1508
	trace_module_free(mod);

L
Linus Torvalds 已提交
1509
	/* Delete from various lists */
1510
	stop_machine(__unlink_module, mod, NULL);
R
Roland McGrath 已提交
1511
	remove_notes_attrs(mod);
L
Linus Torvalds 已提交
1512 1513 1514 1515 1516 1517 1518 1519 1520
	remove_sect_attrs(mod);
	mod_kobject_remove(mod);

	/* Arch-specific cleanup. */
	module_arch_cleanup(mod);

	/* Module unload stuff */
	module_unload_free(mod);

1521 1522 1523
	/* Free any allocated parameters. */
	destroy_params(mod->kp, mod->num_kp);

L
Linus Torvalds 已提交
1524 1525 1526 1527 1528
	/* This may be NULL, but that's OK */
	module_free(mod, mod->module_init);
	kfree(mod->args);
	if (mod->percpu)
		percpu_modfree(mod->percpu);
1529 1530 1531 1532
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
	if (mod->refptr)
		percpu_modfree(mod->refptr);
#endif
I
Ingo Molnar 已提交
1533 1534 1535
	/* Free lock-classes: */
	lockdep_free_key_range(mod->module_core, mod->core_size);

L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541 1542
	/* Finally, free the core (containing the module structure) */
	module_free(mod, mod->module_core);
}

void *__symbol_get(const char *symbol)
{
	struct module *owner;
1543
	const struct kernel_symbol *sym;
L
Linus Torvalds 已提交
1544

R
Rusty Russell 已提交
1545
	preempt_disable();
1546 1547 1548
	sym = find_symbol(symbol, &owner, NULL, true, true);
	if (sym && strong_try_module_get(owner))
		sym = NULL;
R
Rusty Russell 已提交
1549
	preempt_enable();
L
Linus Torvalds 已提交
1550

1551
	return sym ? (void *)sym->value : NULL;
L
Linus Torvalds 已提交
1552 1553 1554
}
EXPORT_SYMBOL_GPL(__symbol_get);

1555 1556
/*
 * Ensure that an exported symbol [global namespace] does not already exist
1557
 * in the kernel or in some other module's exported symbol table.
1558 1559 1560
 */
static int verify_export_symbols(struct module *mod)
{
1561
	unsigned int i;
1562
	struct module *owner;
1563 1564 1565 1566 1567 1568 1569 1570
	const struct kernel_symbol *s;
	struct {
		const struct kernel_symbol *sym;
		unsigned int num;
	} arr[] = {
		{ mod->syms, mod->num_syms },
		{ mod->gpl_syms, mod->num_gpl_syms },
		{ mod->gpl_future_syms, mod->num_gpl_future_syms },
1571
#ifdef CONFIG_UNUSED_SYMBOLS
1572 1573
		{ mod->unused_syms, mod->num_unused_syms },
		{ mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1574
#endif
1575
	};
1576

1577 1578
	for (i = 0; i < ARRAY_SIZE(arr); i++) {
		for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1579
			if (find_symbol(s->name, &owner, NULL, true, false)) {
1580 1581 1582 1583 1584 1585
				printk(KERN_ERR
				       "%s: exports duplicate symbol %s"
				       " (owned by %s)\n",
				       mod->name, s->name, module_name(owner));
				return -ENOEXEC;
			}
1586
		}
1587 1588
	}
	return 0;
1589 1590
}

1591
/* Change all symbols so that st_value encodes the pointer directly. */
L
Linus Torvalds 已提交
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
static int simplify_symbols(Elf_Shdr *sechdrs,
			    unsigned int symindex,
			    const char *strtab,
			    unsigned int versindex,
			    unsigned int pcpuindex,
			    struct module *mod)
{
	Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
	unsigned long secbase;
	unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
	int ret = 0;
1603
	const struct kernel_symbol *ksym;
L
Linus Torvalds 已提交
1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622

	for (i = 1; i < n; i++) {
		switch (sym[i].st_shndx) {
		case SHN_COMMON:
			/* We compiled with -fno-common.  These are not
			   supposed to happen.  */
			DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
			printk("%s: please compile with -fno-common\n",
			       mod->name);
			ret = -ENOEXEC;
			break;

		case SHN_ABS:
			/* Don't need to do anything */
			DEBUGP("Absolute symbol: 0x%08lx\n",
			       (long)sym[i].st_value);
			break;

		case SHN_UNDEF:
1623 1624
			ksym = resolve_symbol(sechdrs, versindex,
					      strtab + sym[i].st_name, mod);
L
Linus Torvalds 已提交
1625
			/* Ok if resolved.  */
1626 1627
			if (ksym) {
				sym[i].st_value = ksym->value;
L
Linus Torvalds 已提交
1628
				break;
1629 1630
			}

L
Linus Torvalds 已提交
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
			/* Ok if weak.  */
			if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
				break;

			printk(KERN_WARNING "%s: Unknown symbol %s\n",
			       mod->name, strtab + sym[i].st_name);
			ret = -ENOENT;
			break;

		default:
			/* Divert to percpu allocation if a percpu var. */
			if (sym[i].st_shndx == pcpuindex)
				secbase = (unsigned long)mod->percpu;
			else
				secbase = sechdrs[sym[i].st_shndx].sh_addr;
			sym[i].st_value += secbase;
			break;
		}
	}

	return ret;
}

1654 1655 1656 1657 1658 1659 1660 1661
/* Additional bytes needed by arch in front of individual sections */
unsigned int __weak arch_mod_section_prepend(struct module *mod,
					     unsigned int section)
{
	/* default implementation just returns zero */
	return 0;
}

L
Linus Torvalds 已提交
1662
/* Update size with this section: return offset. */
1663 1664
static long get_offset(struct module *mod, unsigned int *size,
		       Elf_Shdr *sechdr, unsigned int section)
L
Linus Torvalds 已提交
1665 1666 1667
{
	long ret;

1668
	*size += arch_mod_section_prepend(mod, section);
L
Linus Torvalds 已提交
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
	ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
	*size = ret + sechdr->sh_size;
	return ret;
}

/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
   might -- code, read-only data, read-write data, small data.  Tally
   sizes, and place the offsets into sh_entsize fields: high bit means it
   belongs in init. */
static void layout_sections(struct module *mod,
			    const Elf_Ehdr *hdr,
			    Elf_Shdr *sechdrs,
			    const char *secstrings)
{
	static unsigned long const masks[][2] = {
		/* NOTE: all executable code must be the first section
		 * in this array; otherwise modify the text_size
		 * finder in the two loops below */
		{ SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
		{ SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
		{ SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
		{ ARCH_SHF_SMALL | SHF_ALLOC, 0 }
	};
	unsigned int m, i;

	for (i = 0; i < hdr->e_shnum; i++)
		sechdrs[i].sh_entsize = ~0UL;

	DEBUGP("Core section allocation order:\n");
	for (m = 0; m < ARRAY_SIZE(masks); ++m) {
		for (i = 0; i < hdr->e_shnum; ++i) {
			Elf_Shdr *s = &sechdrs[i];

			if ((s->sh_flags & masks[m][0]) != masks[m][0]
			    || (s->sh_flags & masks[m][1])
			    || s->sh_entsize != ~0UL
R
Rusty Russell 已提交
1705
			    || strstarts(secstrings + s->sh_name, ".init"))
L
Linus Torvalds 已提交
1706
				continue;
1707
			s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
L
Linus Torvalds 已提交
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721
			DEBUGP("\t%s\n", secstrings + s->sh_name);
		}
		if (m == 0)
			mod->core_text_size = mod->core_size;
	}

	DEBUGP("Init section allocation order:\n");
	for (m = 0; m < ARRAY_SIZE(masks); ++m) {
		for (i = 0; i < hdr->e_shnum; ++i) {
			Elf_Shdr *s = &sechdrs[i];

			if ((s->sh_flags & masks[m][0]) != masks[m][0]
			    || (s->sh_flags & masks[m][1])
			    || s->sh_entsize != ~0UL
R
Rusty Russell 已提交
1722
			    || !strstarts(secstrings + s->sh_name, ".init"))
L
Linus Torvalds 已提交
1723
				continue;
1724
			s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
L
Linus Torvalds 已提交
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
					 | INIT_OFFSET_MASK);
			DEBUGP("\t%s\n", secstrings + s->sh_name);
		}
		if (m == 0)
			mod->init_text_size = mod->init_size;
	}
}

static void set_license(struct module *mod, const char *license)
{
	if (!license)
		license = "unspecified";

1738
	if (!license_is_gpl_compatible(license)) {
A
Andi Kleen 已提交
1739
		if (!test_taint(TAINT_PROPRIETARY_MODULE))
1740
			printk(KERN_WARNING "%s: module license '%s' taints "
1741 1742
				"kernel.\n", mod->name, license);
		add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
L
Linus Torvalds 已提交
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
	}
}

/* Parse tag=value strings from .modinfo section */
static char *next_string(char *string, unsigned long *secsize)
{
	/* Skip non-zero chars */
	while (string[0]) {
		string++;
		if ((*secsize)-- <= 1)
			return NULL;
	}

	/* Skip any zero padding. */
	while (!string[0]) {
		string++;
		if ((*secsize)-- <= 1)
			return NULL;
	}
	return string;
}

static char *get_modinfo(Elf_Shdr *sechdrs,
			 unsigned int info,
			 const char *tag)
{
	char *p;
	unsigned int taglen = strlen(tag);
	unsigned long size = sechdrs[info].sh_size;

	for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
		if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
			return p + taglen + 1;
	}
	return NULL;
}

1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794
static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
			  unsigned int infoindex)
{
	struct module_attribute *attr;
	int i;

	for (i = 0; (attr = modinfo_attrs[i]); i++) {
		if (attr->setup)
			attr->setup(mod,
				    get_modinfo(sechdrs,
						infoindex,
						attr->attr.name));
	}
}

L
Linus Torvalds 已提交
1795
#ifdef CONFIG_KALLSYMS
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808

/* lookup symbol in given range of kernel_symbols */
static const struct kernel_symbol *lookup_symbol(const char *name,
	const struct kernel_symbol *start,
	const struct kernel_symbol *stop)
{
	const struct kernel_symbol *ks = start;
	for (; ks < stop; ks++)
		if (strcmp(ks->name, name) == 0)
			return ks;
	return NULL;
}

1809 1810
static int is_exported(const char *name, unsigned long value,
		       const struct module *mod)
L
Linus Torvalds 已提交
1811
{
1812 1813 1814
	const struct kernel_symbol *ks;
	if (!mod)
		ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1815
	else
1816 1817
		ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
	return ks != NULL && ks->value == value;
L
Linus Torvalds 已提交
1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
}

/* As per nm */
static char elf_type(const Elf_Sym *sym,
		     Elf_Shdr *sechdrs,
		     const char *secstrings,
		     struct module *mod)
{
	if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
		if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
			return 'v';
		else
			return 'w';
	}
	if (sym->st_shndx == SHN_UNDEF)
		return 'U';
	if (sym->st_shndx == SHN_ABS)
		return 'a';
	if (sym->st_shndx >= SHN_LORESERVE)
		return '?';
	if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
		return 't';
	if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
	    && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
		if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
			return 'r';
		else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
			return 'g';
		else
			return 'd';
	}
	if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
		if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
			return 's';
		else
			return 'b';
	}
R
Rusty Russell 已提交
1855
	if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
L
Linus Torvalds 已提交
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886
		return 'n';
	return '?';
}

static void add_kallsyms(struct module *mod,
			 Elf_Shdr *sechdrs,
			 unsigned int symindex,
			 unsigned int strindex,
			 const char *secstrings)
{
	unsigned int i;

	mod->symtab = (void *)sechdrs[symindex].sh_addr;
	mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
	mod->strtab = (void *)sechdrs[strindex].sh_addr;

	/* Set types up while we still have access to sections. */
	for (i = 0; i < mod->num_symtab; i++)
		mod->symtab[i].st_info
			= elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
}
#else
static inline void add_kallsyms(struct module *mod,
				Elf_Shdr *sechdrs,
				unsigned int symindex,
				unsigned int strindex,
				const char *secstrings)
{
}
#endif /* CONFIG_KALLSYMS */

1887
static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1888
{
1889 1890 1891 1892 1893
#ifdef CONFIG_DYNAMIC_DEBUG
	if (ddebug_add_module(debug, num, debug->modname))
		printk(KERN_ERR "dynamic debug error adding module: %s\n",
					debug->modname);
#endif
R
Rusty Russell 已提交
1894
}
1895

1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
static void *module_alloc_update_bounds(unsigned long size)
{
	void *ret = module_alloc(size);

	if (ret) {
		/* Update module bounds. */
		if ((unsigned long)ret < module_addr_min)
			module_addr_min = (unsigned long)ret;
		if ((unsigned long)ret + size > module_addr_max)
			module_addr_max = (unsigned long)ret + size;
	}
	return ret;
}

C
Catalin Marinas 已提交
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
#ifdef CONFIG_DEBUG_KMEMLEAK
static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
				 Elf_Shdr *sechdrs, char *secstrings)
{
	unsigned int i;

	/* only scan the sections containing data */
	kmemleak_scan_area(mod->module_core, (unsigned long)mod -
			   (unsigned long)mod->module_core,
			   sizeof(struct module), GFP_KERNEL);

	for (i = 1; i < hdr->e_shnum; i++) {
		if (!(sechdrs[i].sh_flags & SHF_ALLOC))
			continue;
		if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
		    && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
			continue;

		kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr -
				   (unsigned long)mod->module_core,
				   sechdrs[i].sh_size, GFP_KERNEL);
	}
}
#else
static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
					Elf_Shdr *sechdrs, char *secstrings)
{
}
#endif

L
Linus Torvalds 已提交
1940 1941
/* Allocate and load the module: note that size of section 0 is always
   zero, and we rely on this for optional sections. */
1942
static noinline struct module *load_module(void __user *umod,
L
Linus Torvalds 已提交
1943 1944 1945 1946 1947 1948
				  unsigned long len,
				  const char __user *uargs)
{
	Elf_Ehdr *hdr;
	Elf_Shdr *sechdrs;
	char *secstrings, *args, *modmagic, *strtab = NULL;
1949
	char *staging;
A
Andrew Morton 已提交
1950 1951 1952
	unsigned int i;
	unsigned int symindex = 0;
	unsigned int strindex = 0;
R
Rusty Russell 已提交
1953
	unsigned int modindex, versindex, infoindex, pcpuindex;
L
Linus Torvalds 已提交
1954 1955 1956
	struct module *mod;
	long err = 0;
	void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1957
	mm_segment_t old_fs;
L
Linus Torvalds 已提交
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967

	DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
	       umod, len, uargs);
	if (len < sizeof(*hdr))
		return ERR_PTR(-ENOEXEC);

	/* Suck in entire file: we'll want most of it. */
	/* vmalloc barfs on "unusual" numbers.  Check here */
	if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
		return ERR_PTR(-ENOMEM);
1968

L
Linus Torvalds 已提交
1969 1970 1971 1972 1973 1974 1975
	if (copy_from_user(hdr, umod, len) != 0) {
		err = -EFAULT;
		goto free_hdr;
	}

	/* Sanity checks against insmoding binaries or wrong arch,
           weird elf version */
1976
	if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
L
Linus Torvalds 已提交
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008
	    || hdr->e_type != ET_REL
	    || !elf_check_arch(hdr)
	    || hdr->e_shentsize != sizeof(*sechdrs)) {
		err = -ENOEXEC;
		goto free_hdr;
	}

	if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
		goto truncated;

	/* Convenience variables */
	sechdrs = (void *)hdr + hdr->e_shoff;
	secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
	sechdrs[0].sh_addr = 0;

	for (i = 1; i < hdr->e_shnum; i++) {
		if (sechdrs[i].sh_type != SHT_NOBITS
		    && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
			goto truncated;

		/* Mark all sections sh_addr with their address in the
		   temporary image. */
		sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;

		/* Internal symbols and strings. */
		if (sechdrs[i].sh_type == SHT_SYMTAB) {
			symindex = i;
			strindex = sechdrs[i].sh_link;
			strtab = (char *)hdr + sechdrs[strindex].sh_offset;
		}
#ifndef CONFIG_MODULE_UNLOAD
		/* Don't load .exit sections */
R
Rusty Russell 已提交
2009
		if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
L
Linus Torvalds 已提交
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
			sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
#endif
	}

	modindex = find_sec(hdr, sechdrs, secstrings,
			    ".gnu.linkonce.this_module");
	if (!modindex) {
		printk(KERN_WARNING "No module found in object\n");
		err = -ENOEXEC;
		goto free_hdr;
	}
R
Rusty Russell 已提交
2021
	/* This is temporary: point mod into copy of data. */
L
Linus Torvalds 已提交
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
	mod = (void *)sechdrs[modindex].sh_addr;

	if (symindex == 0) {
		printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
		       mod->name);
		err = -ENOEXEC;
		goto free_hdr;
	}

	versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
	infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
	pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);

2035
	/* Don't keep modinfo and version sections. */
L
Linus Torvalds 已提交
2036
	sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2037
	sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
L
Linus Torvalds 已提交
2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
#ifdef CONFIG_KALLSYMS
	/* Keep symbol and string tables for decoding later. */
	sechdrs[symindex].sh_flags |= SHF_ALLOC;
	sechdrs[strindex].sh_flags |= SHF_ALLOC;
#endif

	/* Check module struct version now, before we try to use module. */
	if (!check_modstruct_version(sechdrs, versindex, mod)) {
		err = -ENOEXEC;
		goto free_hdr;
	}

	modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
	/* This is allowed: modprobe --force will invalidate it. */
	if (!modmagic) {
2053
		err = try_to_force_load(mod, "bad vermagic");
2054 2055
		if (err)
			goto free_hdr;
2056
	} else if (!same_magic(modmagic, vermagic, versindex)) {
L
Linus Torvalds 已提交
2057 2058 2059 2060 2061 2062
		printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
		       mod->name, modmagic, vermagic);
		err = -ENOEXEC;
		goto free_hdr;
	}

2063 2064 2065 2066 2067 2068 2069 2070
	staging = get_modinfo(sechdrs, infoindex, "staging");
	if (staging) {
		add_taint_module(mod, TAINT_CRAP);
		printk(KERN_WARNING "%s: module is from the staging directory,"
		       " the quality is unknown, you have been warned.\n",
		       mod->name);
	}

L
Linus Torvalds 已提交
2071
	/* Now copy in args */
2072 2073 2074
	args = strndup_user(uargs, ~0UL >> 1);
	if (IS_ERR(args)) {
		err = PTR_ERR(args);
L
Linus Torvalds 已提交
2075 2076
		goto free_hdr;
	}
2077

L
Linus Torvalds 已提交
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092
	if (find_module(mod->name)) {
		err = -EEXIST;
		goto free_mod;
	}

	mod->state = MODULE_STATE_COMING;

	/* Allow arches to frob section contents and sizes.  */
	err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
	if (err < 0)
		goto free_mod;

	if (pcpuindex) {
		/* We have a special allocation for this section. */
		percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2093 2094
					 sechdrs[pcpuindex].sh_addralign,
					 mod->name);
L
Linus Torvalds 已提交
2095 2096
		if (!percpu) {
			err = -ENOMEM;
2097
			goto free_mod;
L
Linus Torvalds 已提交
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
		}
		sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
		mod->percpu = percpu;
	}

	/* Determine total sizes, and put offsets in sh_entsize.  For now
	   this is done generically; there doesn't appear to be any
	   special cases for the architectures. */
	layout_sections(mod, hdr, sechdrs, secstrings);

	/* Do the allocs. */
2109
	ptr = module_alloc_update_bounds(mod->core_size);
C
Catalin Marinas 已提交
2110 2111 2112 2113 2114 2115
	/*
	 * The pointer to this block is stored in the module structure
	 * which is inside the block. Just mark it as not being a
	 * leak.
	 */
	kmemleak_not_leak(ptr);
L
Linus Torvalds 已提交
2116 2117 2118 2119 2120 2121 2122
	if (!ptr) {
		err = -ENOMEM;
		goto free_percpu;
	}
	memset(ptr, 0, mod->core_size);
	mod->module_core = ptr;

2123
	ptr = module_alloc_update_bounds(mod->init_size);
C
Catalin Marinas 已提交
2124 2125 2126 2127 2128 2129 2130
	/*
	 * The pointer to this block is stored in the module structure
	 * which is inside the block. This block doesn't need to be
	 * scanned as it contains data and code that will be freed
	 * after the module is initialized.
	 */
	kmemleak_ignore(ptr);
L
Linus Torvalds 已提交
2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160
	if (!ptr && mod->init_size) {
		err = -ENOMEM;
		goto free_core;
	}
	memset(ptr, 0, mod->init_size);
	mod->module_init = ptr;

	/* Transfer each section which specifies SHF_ALLOC */
	DEBUGP("final section addresses:\n");
	for (i = 0; i < hdr->e_shnum; i++) {
		void *dest;

		if (!(sechdrs[i].sh_flags & SHF_ALLOC))
			continue;

		if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
			dest = mod->module_init
				+ (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
		else
			dest = mod->module_core + sechdrs[i].sh_entsize;

		if (sechdrs[i].sh_type != SHT_NOBITS)
			memcpy(dest, (void *)sechdrs[i].sh_addr,
			       sechdrs[i].sh_size);
		/* Update sh_addr to point to copy in image. */
		sechdrs[i].sh_addr = (unsigned long)dest;
		DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
	}
	/* Module has been moved. */
	mod = (void *)sechdrs[modindex].sh_addr;
C
Catalin Marinas 已提交
2161
	kmemleak_load_module(mod, hdr, sechdrs, secstrings);
L
Linus Torvalds 已提交
2162

2163 2164 2165 2166 2167 2168 2169 2170
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
	mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
				      mod->name);
	if (!mod->refptr) {
		err = -ENOMEM;
		goto free_init;
	}
#endif
L
Linus Torvalds 已提交
2171 2172 2173
	/* Now we've moved module, initialize linked lists, etc. */
	module_unload_init(mod);

2174
	/* add kobject, so we can reference it. */
2175 2176
	err = mod_sysfs_init(mod);
	if (err)
2177
		goto free_unload;
K
Kay Sievers 已提交
2178

L
Linus Torvalds 已提交
2179 2180 2181
	/* Set up license info based on the info section */
	set_license(mod, get_modinfo(sechdrs, infoindex, "license"));

2182 2183 2184 2185 2186
	/*
	 * ndiswrapper is under GPL by itself, but loads proprietary modules.
	 * Don't use add_taint_module(), as it would prevent ndiswrapper from
	 * using GPL-only symbols it needs.
	 */
2187
	if (strcmp(mod->name, "ndiswrapper") == 0)
2188 2189 2190
		add_taint(TAINT_PROPRIETARY_MODULE);

	/* driverloader was caught wrongly pretending to be under GPL */
2191 2192
	if (strcmp(mod->name, "driverloader") == 0)
		add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2193

2194 2195 2196
	/* Set up MODINFO_ATTR fields */
	setup_modinfo(mod, sechdrs, infoindex);

L
Linus Torvalds 已提交
2197 2198 2199 2200 2201 2202
	/* Fix up syms, so that st_value is a pointer to location. */
	err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
			       mod);
	if (err < 0)
		goto cleanup;

R
Rusty Russell 已提交
2203 2204
	/* Now we've got everything in the final locations, we can
	 * find optional sections. */
2205 2206
	mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
			       sizeof(*mod->kp), &mod->num_kp);
R
Rusty Russell 已提交
2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219
	mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
				 sizeof(*mod->syms), &mod->num_syms);
	mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
	mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
				     sizeof(*mod->gpl_syms),
				     &mod->num_gpl_syms);
	mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
	mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
					    "__ksymtab_gpl_future",
					    sizeof(*mod->gpl_future_syms),
					    &mod->num_gpl_future_syms);
	mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
					    "__kcrctab_gpl_future");
L
Linus Torvalds 已提交
2220

2221
#ifdef CONFIG_UNUSED_SYMBOLS
R
Rusty Russell 已提交
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
	mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
					"__ksymtab_unused",
					sizeof(*mod->unused_syms),
					&mod->num_unused_syms);
	mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
					"__kcrctab_unused");
	mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
					    "__ksymtab_unused_gpl",
					    sizeof(*mod->unused_gpl_syms),
					    &mod->num_unused_gpl_syms);
	mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
					    "__kcrctab_unused_gpl");
#endif
2235 2236 2237 2238
#ifdef CONFIG_CONSTRUCTORS
	mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
				  sizeof(*mod->ctors), &mod->num_ctors);
#endif
R
Rusty Russell 已提交
2239 2240 2241 2242 2243 2244

#ifdef CONFIG_TRACEPOINTS
	mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
					"__tracepoints",
					sizeof(*mod->tracepoints),
					&mod->num_tracepoints);
2245
#endif
2246 2247 2248 2249 2250 2251
#ifdef CONFIG_EVENT_TRACING
	mod->trace_events = section_objs(hdr, sechdrs, secstrings,
					 "_ftrace_events",
					 sizeof(*mod->trace_events),
					 &mod->num_trace_events);
#endif
2252 2253 2254 2255 2256 2257 2258
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
	/* sechdrs[0].sh_size is always zero */
	mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
					     "__mcount_loc",
					     sizeof(*mod->ftrace_callsites),
					     &mod->num_ftrace_callsites);
#endif
L
Linus Torvalds 已提交
2259
#ifdef CONFIG_MODVERSIONS
R
Rusty Russell 已提交
2260 2261 2262
	if ((mod->num_syms && !mod->crcs)
	    || (mod->num_gpl_syms && !mod->gpl_crcs)
	    || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2263
#ifdef CONFIG_UNUSED_SYMBOLS
R
Rusty Russell 已提交
2264 2265
	    || (mod->num_unused_syms && !mod->unused_crcs)
	    || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2266 2267
#endif
		) {
2268 2269
		err = try_to_force_load(mod,
					"no versions for exported symbols");
2270 2271
		if (err)
			goto cleanup;
L
Linus Torvalds 已提交
2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
	}
#endif

	/* Now do relocations. */
	for (i = 1; i < hdr->e_shnum; i++) {
		const char *strtab = (char *)sechdrs[strindex].sh_addr;
		unsigned int info = sechdrs[i].sh_info;

		/* Not a valid relocation section? */
		if (info >= hdr->e_shnum)
			continue;

		/* Don't bother with non-allocated sections */
		if (!(sechdrs[info].sh_flags & SHF_ALLOC))
			continue;

		if (sechdrs[i].sh_type == SHT_REL)
			err = apply_relocate(sechdrs, strtab, symindex, i,mod);
		else if (sechdrs[i].sh_type == SHT_RELA)
			err = apply_relocate_add(sechdrs, strtab, symindex, i,
						 mod);
		if (err < 0)
			goto cleanup;
	}

2297 2298 2299 2300 2301
        /* Find duplicate symbols */
	err = verify_export_symbols(mod);
	if (err < 0)
		goto cleanup;

L
Linus Torvalds 已提交
2302
  	/* Set up and sort exception table */
R
Rusty Russell 已提交
2303 2304 2305
	mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
				    sizeof(*mod->extable), &mod->num_exentries);
	sort_extable(mod->extable, mod->extable + mod->num_exentries);
L
Linus Torvalds 已提交
2306 2307 2308 2309 2310 2311 2312

	/* Finally, copy percpu area over. */
	percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
		       sechdrs[pcpuindex].sh_size);

	add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);

M
Mathieu Desnoyers 已提交
2313
	if (!mod->taints) {
2314
		struct _ddebug *debug;
R
Rusty Russell 已提交
2315 2316 2317 2318
		unsigned int num_debug;

		debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
				     sizeof(*debug), &num_debug);
2319 2320
		if (debug)
			dynamic_debug_setup(debug, num_debug);
M
Mathieu Desnoyers 已提交
2321
	}
2322

L
Linus Torvalds 已提交
2323 2324 2325 2326
	err = module_finalize(hdr, sechdrs, mod);
	if (err < 0)
		goto cleanup;

2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344
	/* flush the icache in correct context */
	old_fs = get_fs();
	set_fs(KERNEL_DS);

	/*
	 * Flush the instruction cache, since we've played with text.
	 * Do it before processing of module parameters, so the module
	 * can provide parameter accessor functions of its own.
	 */
	if (mod->module_init)
		flush_icache_range((unsigned long)mod->module_init,
				   (unsigned long)mod->module_init
				   + mod->init_size);
	flush_icache_range((unsigned long)mod->module_core,
			   (unsigned long)mod->module_core + mod->core_size);

	set_fs(old_fs);

L
Linus Torvalds 已提交
2345
	mod->args = args;
R
Rusty Russell 已提交
2346
	if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
R
Rusty Russell 已提交
2347 2348 2349
		printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
		       mod->name);

2350
	/* Now sew it into the lists so we can get lockdep and oops
2351 2352 2353 2354 2355 2356 2357
	 * info during argument parsing.  Noone should access us, since
	 * strong_try_module_get() will fail.
	 * lockdep/oops can run asynchronous, so use the RCU list insertion
	 * function to insert in a way safe to concurrent readers.
	 * The mutex protects against concurrent writers.
	 */
	list_add_rcu(&mod->list, &modules);
2358

2359
	err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
L
Linus Torvalds 已提交
2360
	if (err < 0)
2361
		goto unlink;
L
Linus Torvalds 已提交
2362

2363
	err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
L
Linus Torvalds 已提交
2364
	if (err < 0)
2365
		goto unlink;
L
Linus Torvalds 已提交
2366
	add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
R
Roland McGrath 已提交
2367
	add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
L
Linus Torvalds 已提交
2368 2369 2370 2371

	/* Get rid of temporary copy */
	vfree(hdr);

2372 2373
	trace_module_load(mod);

L
Linus Torvalds 已提交
2374 2375 2376
	/* Done! */
	return mod;

2377
 unlink:
2378 2379 2380
	/* Unlink carefully: kallsyms could be walking list. */
	list_del_rcu(&mod->list);
	synchronize_sched();
L
Linus Torvalds 已提交
2381 2382
	module_arch_cleanup(mod);
 cleanup:
2383 2384 2385
	kobject_del(&mod->mkobj.kobj);
	kobject_put(&mod->mkobj.kobj);
 free_unload:
L
Linus Torvalds 已提交
2386
	module_unload_free(mod);
2387
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2388
 free_init:
2389 2390
	percpu_modfree(mod->refptr);
#endif
L
Linus Torvalds 已提交
2391 2392 2393
	module_free(mod, mod->module_init);
 free_core:
	module_free(mod, mod->module_core);
2394
	/* mod will be freed with core. Don't access it beyond this line! */
L
Linus Torvalds 已提交
2395 2396 2397 2398 2399 2400 2401
 free_percpu:
	if (percpu)
		percpu_modfree(percpu);
 free_mod:
	kfree(args);
 free_hdr:
	vfree(hdr);
2402
	return ERR_PTR(err);
L
Linus Torvalds 已提交
2403 2404 2405 2406 2407 2408 2409

 truncated:
	printk(KERN_ERR "Module len %lu truncated\n", len);
	err = -ENOEXEC;
	goto free_hdr;
}

2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420
/* Call module constructors. */
static void do_mod_ctors(struct module *mod)
{
#ifdef CONFIG_CONSTRUCTORS
	unsigned long i;

	for (i = 0; i < mod->num_ctors; i++)
		mod->ctors[i]();
#endif
}

L
Linus Torvalds 已提交
2421
/* This is where the real work happens */
2422 2423
SYSCALL_DEFINE3(init_module, void __user *, umod,
		unsigned long, len, const char __user *, uargs)
L
Linus Torvalds 已提交
2424 2425 2426 2427 2428
{
	struct module *mod;
	int ret = 0;

	/* Must have permission */
2429
	if (!capable(CAP_SYS_MODULE) || modules_disabled)
L
Linus Torvalds 已提交
2430 2431 2432
		return -EPERM;

	/* Only one module load at a time, please */
2433
	if (mutex_lock_interruptible(&module_mutex) != 0)
L
Linus Torvalds 已提交
2434 2435 2436 2437 2438
		return -EINTR;

	/* Do all the hard work */
	mod = load_module(umod, len, uargs);
	if (IS_ERR(mod)) {
2439
		mutex_unlock(&module_mutex);
L
Linus Torvalds 已提交
2440 2441 2442 2443
		return PTR_ERR(mod);
	}

	/* Drop lock so they can recurse */
2444
	mutex_unlock(&module_mutex);
L
Linus Torvalds 已提交
2445

2446 2447
	blocking_notifier_call_chain(&module_notify_list,
			MODULE_STATE_COMING, mod);
L
Linus Torvalds 已提交
2448

2449
	do_mod_ctors(mod);
L
Linus Torvalds 已提交
2450 2451
	/* Start the module */
	if (mod->init != NULL)
2452
		ret = do_one_initcall(mod->init);
L
Linus Torvalds 已提交
2453 2454 2455 2456
	if (ret < 0) {
		/* Init routine failed: abort.  Try to protect us from
                   buggy refcounters. */
		mod->state = MODULE_STATE_GOING;
2457
		synchronize_sched();
R
Rusty Russell 已提交
2458
		module_put(mod);
2459 2460
		blocking_notifier_call_chain(&module_notify_list,
					     MODULE_STATE_GOING, mod);
R
Rusty Russell 已提交
2461 2462 2463
		mutex_lock(&module_mutex);
		free_module(mod);
		mutex_unlock(&module_mutex);
2464
		wake_up(&module_wq);
L
Linus Torvalds 已提交
2465 2466
		return ret;
	}
2467
	if (ret > 0) {
2468 2469 2470
		printk(KERN_WARNING
"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
"%s: loading module anyway...\n",
2471 2472 2473 2474
		       __func__, mod->name, ret,
		       __func__);
		dump_stack();
	}
L
Linus Torvalds 已提交
2475

2476
	/* Now it's a first class citizen!  Wake up anyone waiting for it. */
L
Linus Torvalds 已提交
2477
	mod->state = MODULE_STATE_LIVE;
2478
	wake_up(&module_wq);
2479 2480
	blocking_notifier_call_chain(&module_notify_list,
				     MODULE_STATE_LIVE, mod);
2481

2482 2483 2484
	/* We need to finish all async code before the module init sequence is done */
	async_synchronize_full();

2485
	mutex_lock(&module_mutex);
L
Linus Torvalds 已提交
2486 2487
	/* Drop initial reference. */
	module_put(mod);
2488
	trim_init_extable(mod);
L
Linus Torvalds 已提交
2489 2490 2491 2492
	module_free(mod, mod->module_init);
	mod->module_init = NULL;
	mod->init_size = 0;
	mod->init_text_size = 0;
2493
	mutex_unlock(&module_mutex);
L
Linus Torvalds 已提交
2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509

	return 0;
}

static inline int within(unsigned long addr, void *start, unsigned long size)
{
	return ((void *)addr >= start && (void *)addr < start + size);
}

#ifdef CONFIG_KALLSYMS
/*
 * This ignores the intensely annoying "mapping symbols" found
 * in ARM ELF files: $a, $t and $d.
 */
static inline int is_arm_mapping_symbol(const char *str)
{
D
Daniel Walker 已提交
2510
	return str[0] == '$' && strchr("atd", str[1])
L
Linus Torvalds 已提交
2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522
	       && (str[2] == '\0' || str[2] == '.');
}

static const char *get_ksymbol(struct module *mod,
			       unsigned long addr,
			       unsigned long *size,
			       unsigned long *offset)
{
	unsigned int i, best = 0;
	unsigned long nextval;

	/* At worse, next value is at end of module */
2523
	if (within_module_init(addr, mod))
L
Linus Torvalds 已提交
2524
		nextval = (unsigned long)mod->module_init+mod->init_text_size;
D
Daniel Walker 已提交
2525
	else
L
Linus Torvalds 已提交
2526 2527 2528
		nextval = (unsigned long)mod->module_core+mod->core_text_size;

	/* Scan for closest preceeding symbol, and next symbol. (ELF
D
Daniel Walker 已提交
2529
	   starts real symbols at 1). */
L
Linus Torvalds 已提交
2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550
	for (i = 1; i < mod->num_symtab; i++) {
		if (mod->symtab[i].st_shndx == SHN_UNDEF)
			continue;

		/* We ignore unnamed symbols: they're uninformative
		 * and inserted at a whim. */
		if (mod->symtab[i].st_value <= addr
		    && mod->symtab[i].st_value > mod->symtab[best].st_value
		    && *(mod->strtab + mod->symtab[i].st_name) != '\0'
		    && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
			best = i;
		if (mod->symtab[i].st_value > addr
		    && mod->symtab[i].st_value < nextval
		    && *(mod->strtab + mod->symtab[i].st_name) != '\0'
		    && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
			nextval = mod->symtab[i].st_value;
	}

	if (!best)
		return NULL;

A
Alexey Dobriyan 已提交
2551 2552 2553 2554
	if (size)
		*size = nextval - mod->symtab[best].st_value;
	if (offset)
		*offset = addr - mod->symtab[best].st_value;
L
Linus Torvalds 已提交
2555 2556 2557
	return mod->strtab + mod->symtab[best].st_name;
}

2558 2559
/* For kallsyms to ask for address resolution.  NULL means not found.  Careful
 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2560
const char *module_address_lookup(unsigned long addr,
2561 2562 2563 2564
			    unsigned long *size,
			    unsigned long *offset,
			    char **modname,
			    char *namebuf)
L
Linus Torvalds 已提交
2565 2566
{
	struct module *mod;
2567
	const char *ret = NULL;
L
Linus Torvalds 已提交
2568

2569
	preempt_disable();
2570
	list_for_each_entry_rcu(mod, &modules, list) {
2571 2572
		if (within_module_init(addr, mod) ||
		    within_module_core(addr, mod)) {
2573 2574
			if (modname)
				*modname = mod->name;
2575 2576
			ret = get_ksymbol(mod, addr, size, offset);
			break;
L
Linus Torvalds 已提交
2577 2578
		}
	}
2579 2580 2581 2582 2583
	/* Make a copy in here where it's safe */
	if (ret) {
		strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
		ret = namebuf;
	}
2584
	preempt_enable();
2585
	return ret;
L
Linus Torvalds 已提交
2586 2587
}

2588 2589 2590 2591
int lookup_module_symbol_name(unsigned long addr, char *symname)
{
	struct module *mod;

2592
	preempt_disable();
2593
	list_for_each_entry_rcu(mod, &modules, list) {
2594 2595
		if (within_module_init(addr, mod) ||
		    within_module_core(addr, mod)) {
2596 2597 2598 2599 2600
			const char *sym;

			sym = get_ksymbol(mod, addr, NULL, NULL);
			if (!sym)
				goto out;
2601
			strlcpy(symname, sym, KSYM_NAME_LEN);
2602
			preempt_enable();
2603 2604 2605 2606
			return 0;
		}
	}
out:
2607
	preempt_enable();
2608 2609 2610
	return -ERANGE;
}

2611 2612 2613 2614 2615
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
			unsigned long *offset, char *modname, char *name)
{
	struct module *mod;

2616
	preempt_disable();
2617
	list_for_each_entry_rcu(mod, &modules, list) {
2618 2619
		if (within_module_init(addr, mod) ||
		    within_module_core(addr, mod)) {
2620 2621 2622 2623 2624 2625
			const char *sym;

			sym = get_ksymbol(mod, addr, size, offset);
			if (!sym)
				goto out;
			if (modname)
2626
				strlcpy(modname, mod->name, MODULE_NAME_LEN);
2627
			if (name)
2628
				strlcpy(name, sym, KSYM_NAME_LEN);
2629
			preempt_enable();
2630 2631 2632 2633
			return 0;
		}
	}
out:
2634
	preempt_enable();
2635 2636 2637
	return -ERANGE;
}

2638 2639
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
			char *name, char *module_name, int *exported)
L
Linus Torvalds 已提交
2640 2641 2642
{
	struct module *mod;

2643
	preempt_disable();
2644
	list_for_each_entry_rcu(mod, &modules, list) {
L
Linus Torvalds 已提交
2645 2646 2647
		if (symnum < mod->num_symtab) {
			*value = mod->symtab[symnum].st_value;
			*type = mod->symtab[symnum].st_info;
2648
			strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2649 2650
				KSYM_NAME_LEN);
			strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2651
			*exported = is_exported(name, *value, mod);
2652
			preempt_enable();
2653
			return 0;
L
Linus Torvalds 已提交
2654 2655 2656
		}
		symnum -= mod->num_symtab;
	}
2657
	preempt_enable();
2658
	return -ERANGE;
L
Linus Torvalds 已提交
2659 2660 2661 2662 2663 2664 2665
}

static unsigned long mod_find_symname(struct module *mod, const char *name)
{
	unsigned int i;

	for (i = 0; i < mod->num_symtab; i++)
2666 2667
		if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
		    mod->symtab[i].st_info != 'U')
L
Linus Torvalds 已提交
2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679
			return mod->symtab[i].st_value;
	return 0;
}

/* Look for this name: can be of form module:name. */
unsigned long module_kallsyms_lookup_name(const char *name)
{
	struct module *mod;
	char *colon;
	unsigned long ret = 0;

	/* Don't lock: we're in enough trouble already. */
2680
	preempt_disable();
L
Linus Torvalds 已提交
2681 2682 2683 2684 2685 2686
	if ((colon = strchr(name, ':')) != NULL) {
		*colon = '\0';
		if ((mod = find_module(name)) != NULL)
			ret = mod_find_symname(mod, colon+1);
		*colon = ':';
	} else {
2687
		list_for_each_entry_rcu(mod, &modules, list)
L
Linus Torvalds 已提交
2688 2689 2690
			if ((ret = mod_find_symname(mod, name)) != 0)
				break;
	}
2691
	preempt_enable();
L
Linus Torvalds 已提交
2692 2693
	return ret;
}
2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712

int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
					     struct module *, unsigned long),
				   void *data)
{
	struct module *mod;
	unsigned int i;
	int ret;

	list_for_each_entry(mod, &modules, list) {
		for (i = 0; i < mod->num_symtab; i++) {
			ret = fn(data, mod->strtab + mod->symtab[i].st_name,
				 mod, mod->symtab[i].st_value);
			if (ret != 0)
				return ret;
		}
	}
	return 0;
}
L
Linus Torvalds 已提交
2713 2714
#endif /* CONFIG_KALLSYMS */

2715
static char *module_flags(struct module *mod, char *buf)
2716 2717 2718
{
	int bx = 0;

2719 2720 2721
	if (mod->taints ||
	    mod->state == MODULE_STATE_GOING ||
	    mod->state == MODULE_STATE_COMING) {
2722
		buf[bx++] = '(';
A
Andi Kleen 已提交
2723
		if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2724
			buf[bx++] = 'P';
A
Andi Kleen 已提交
2725
		if (mod->taints & (1 << TAINT_FORCED_MODULE))
2726
			buf[bx++] = 'F';
2727
		if (mod->taints & (1 << TAINT_CRAP))
2728
			buf[bx++] = 'C';
2729 2730 2731 2732 2733
		/*
		 * TAINT_FORCED_RMMOD: could be added.
		 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
		 * apply to modules.
		 */
2734 2735 2736 2737 2738 2739 2740

		/* Show a - for module-is-being-unloaded */
		if (mod->state == MODULE_STATE_GOING)
			buf[bx++] = '-';
		/* Show a + for module-is-being-loaded */
		if (mod->state == MODULE_STATE_COMING)
			buf[bx++] = '+';
2741 2742 2743 2744 2745 2746 2747
		buf[bx++] = ')';
	}
	buf[bx] = '\0';

	return buf;
}

2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765
#ifdef CONFIG_PROC_FS
/* Called by the /proc file system to return a list of modules. */
static void *m_start(struct seq_file *m, loff_t *pos)
{
	mutex_lock(&module_mutex);
	return seq_list_start(&modules, *pos);
}

static void *m_next(struct seq_file *m, void *p, loff_t *pos)
{
	return seq_list_next(p, &modules, pos);
}

static void m_stop(struct seq_file *m, void *p)
{
	mutex_unlock(&module_mutex);
}

L
Linus Torvalds 已提交
2766 2767 2768
static int m_show(struct seq_file *m, void *p)
{
	struct module *mod = list_entry(p, struct module, list);
2769 2770
	char buf[8];

2771
	seq_printf(m, "%s %u",
L
Linus Torvalds 已提交
2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782
		   mod->name, mod->init_size + mod->core_size);
	print_unload_info(m, mod);

	/* Informative for users. */
	seq_printf(m, " %s",
		   mod->state == MODULE_STATE_GOING ? "Unloading":
		   mod->state == MODULE_STATE_COMING ? "Loading":
		   "Live");
	/* Used by oprofile and other similar tools. */
	seq_printf(m, " 0x%p", mod->module_core);

2783 2784
	/* Taints info */
	if (mod->taints)
2785
		seq_printf(m, " %s", module_flags(mod, buf));
2786

L
Linus Torvalds 已提交
2787 2788 2789 2790 2791 2792 2793 2794 2795
	seq_printf(m, "\n");
	return 0;
}

/* Format: modulename size refcount deps address

   Where refcount is a number or -, and deps is a comma-separated list
   of depends or -.
*/
2796
static const struct seq_operations modules_op = {
L
Linus Torvalds 已提交
2797 2798 2799 2800 2801 2802
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= m_show
};

2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822
static int modules_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &modules_op);
}

static const struct file_operations proc_modules_operations = {
	.open		= modules_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init proc_modules_init(void)
{
	proc_create("modules", 0, NULL, &proc_modules_operations);
	return 0;
}
module_init(proc_modules_init);
#endif

L
Linus Torvalds 已提交
2823 2824 2825 2826 2827 2828
/* Given an address, look for it in the module exception tables. */
const struct exception_table_entry *search_module_extables(unsigned long addr)
{
	const struct exception_table_entry *e = NULL;
	struct module *mod;

R
Rusty Russell 已提交
2829
	preempt_disable();
2830
	list_for_each_entry_rcu(mod, &modules, list) {
L
Linus Torvalds 已提交
2831 2832
		if (mod->num_exentries == 0)
			continue;
D
Daniel Walker 已提交
2833

L
Linus Torvalds 已提交
2834 2835 2836 2837 2838 2839
		e = search_extable(mod->extable,
				   mod->extable + mod->num_exentries - 1,
				   addr);
		if (e)
			break;
	}
R
Rusty Russell 已提交
2840
	preempt_enable();
L
Linus Torvalds 已提交
2841 2842

	/* Now, if we found one, we are running inside it now, hence
D
Daniel Walker 已提交
2843
	   we cannot unload the module, hence no refcnt needed. */
L
Linus Torvalds 已提交
2844 2845 2846
	return e;
}

2847
/*
R
Rusty Russell 已提交
2848 2849 2850 2851 2852
 * is_module_address - is this address inside a module?
 * @addr: the address to check.
 *
 * See is_module_text_address() if you simply want to see if the address
 * is code (not data).
2853
 */
R
Rusty Russell 已提交
2854
bool is_module_address(unsigned long addr)
2855
{
R
Rusty Russell 已提交
2856
	bool ret;
2857

R
Rusty Russell 已提交
2858
	preempt_disable();
R
Rusty Russell 已提交
2859
	ret = __module_address(addr) != NULL;
R
Rusty Russell 已提交
2860
	preempt_enable();
2861

R
Rusty Russell 已提交
2862
	return ret;
2863 2864
}

R
Rusty Russell 已提交
2865 2866 2867 2868 2869 2870 2871
/*
 * __module_address - get the module which contains an address.
 * @addr: the address.
 *
 * Must be called with preempt disabled or module mutex held so that
 * module doesn't get freed during this.
 */
2872
struct module *__module_address(unsigned long addr)
L
Linus Torvalds 已提交
2873 2874 2875
{
	struct module *mod;

2876 2877 2878
	if (addr < module_addr_min || addr > module_addr_max)
		return NULL;

2879
	list_for_each_entry_rcu(mod, &modules, list)
R
Rusty Russell 已提交
2880 2881
		if (within_module_core(addr, mod)
		    || within_module_init(addr, mod))
L
Linus Torvalds 已提交
2882 2883 2884
			return mod;
	return NULL;
}
2885
EXPORT_SYMBOL_GPL(__module_address);
L
Linus Torvalds 已提交
2886

R
Rusty Russell 已提交
2887 2888 2889 2890 2891 2892 2893 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 2923
/*
 * is_module_text_address - is this address inside module code?
 * @addr: the address to check.
 *
 * See is_module_address() if you simply want to see if the address is
 * anywhere in a module.  See kernel_text_address() for testing if an
 * address corresponds to kernel or module code.
 */
bool is_module_text_address(unsigned long addr)
{
	bool ret;

	preempt_disable();
	ret = __module_text_address(addr) != NULL;
	preempt_enable();

	return ret;
}

/*
 * __module_text_address - get the module whose code contains an address.
 * @addr: the address.
 *
 * Must be called with preempt disabled or module mutex held so that
 * module doesn't get freed during this.
 */
struct module *__module_text_address(unsigned long addr)
{
	struct module *mod = __module_address(addr);
	if (mod) {
		/* Make sure it's within the text section. */
		if (!within(addr, mod->module_init, mod->init_text_size)
		    && !within(addr, mod->module_core, mod->core_text_size))
			mod = NULL;
	}
	return mod;
}
2924
EXPORT_SYMBOL_GPL(__module_text_address);
R
Rusty Russell 已提交
2925

L
Linus Torvalds 已提交
2926 2927 2928 2929
/* Don't grab lock, we're oopsing. */
void print_modules(void)
{
	struct module *mod;
2930
	char buf[8];
L
Linus Torvalds 已提交
2931

2932
	printk(KERN_DEFAULT "Modules linked in:");
2933 2934 2935
	/* Most callers should already have preempt disabled, but make sure */
	preempt_disable();
	list_for_each_entry_rcu(mod, &modules, list)
2936
		printk(" %s%s", mod->name, module_flags(mod, buf));
2937
	preempt_enable();
2938 2939
	if (last_unloaded_module[0])
		printk(" [last unloaded: %s]", last_unloaded_module);
L
Linus Torvalds 已提交
2940 2941 2942 2943
	printk("\n");
}

#ifdef CONFIG_MODVERSIONS
2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954
/* Generate the signature for all relevant module structures here.
 * If these change, we don't want to try to parse the module. */
void module_layout(struct module *mod,
		   struct modversion_info *ver,
		   struct kernel_param *kp,
		   struct kernel_symbol *ks,
		   struct marker *marker,
		   struct tracepoint *tp)
{
}
EXPORT_SYMBOL(module_layout);
L
Linus Torvalds 已提交
2955
#endif
M
Mathieu Desnoyers 已提交
2956

M
Mathieu Desnoyers 已提交
2957 2958 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 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002
#ifdef CONFIG_TRACEPOINTS
void module_update_tracepoints(void)
{
	struct module *mod;

	mutex_lock(&module_mutex);
	list_for_each_entry(mod, &modules, list)
		if (!mod->taints)
			tracepoint_update_probe_range(mod->tracepoints,
				mod->tracepoints + mod->num_tracepoints);
	mutex_unlock(&module_mutex);
}

/*
 * Returns 0 if current not found.
 * Returns 1 if current found.
 */
int module_get_iter_tracepoints(struct tracepoint_iter *iter)
{
	struct module *iter_mod;
	int found = 0;

	mutex_lock(&module_mutex);
	list_for_each_entry(iter_mod, &modules, list) {
		if (!iter_mod->taints) {
			/*
			 * Sorted module list
			 */
			if (iter_mod < iter->module)
				continue;
			else if (iter_mod > iter->module)
				iter->tracepoint = NULL;
			found = tracepoint_get_iter_range(&iter->tracepoint,
				iter_mod->tracepoints,
				iter_mod->tracepoints
					+ iter_mod->num_tracepoints);
			if (found) {
				iter->module = iter_mod;
				break;
			}
		}
	}
	mutex_unlock(&module_mutex);
	return found;
}
#endif