thinkpad-acpi: avoid keymap pitfall
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / module.c
blob3d1df514cd27f727ee8fb14689d3ee603aa3e9f8
1 /*
2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
24 #include <linux/fs.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #include <linux/cpu.h>
37 #include <linux/moduleparam.h>
38 #include <linux/errno.h>
39 #include <linux/err.h>
40 #include <linux/vermagic.h>
41 #include <linux/notifier.h>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/module.h>
62 EXPORT_TRACEPOINT_SYMBOL(module_get);
64 #if 0
65 #define DEBUGP printk
66 #else
67 #define DEBUGP(fmt , a...)
68 #endif
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
72 #endif
74 /* If this is set, the section belongs in the init part of the module */
75 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
77 /* List of modules, protected by module_mutex or preempt_disable
78 * (delete uses stop_machine/add uses RCU list operations). */
79 DEFINE_MUTEX(module_mutex);
80 EXPORT_SYMBOL_GPL(module_mutex);
81 static LIST_HEAD(modules);
83 /* Block module loading/unloading? */
84 int modules_disabled = 0;
86 /* Waiting for a module to finish initializing? */
87 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
89 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
91 /* Bounds of module allocation, for speeding __module_address */
92 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
94 int register_module_notifier(struct notifier_block * nb)
96 return blocking_notifier_chain_register(&module_notify_list, nb);
98 EXPORT_SYMBOL(register_module_notifier);
100 int unregister_module_notifier(struct notifier_block * nb)
102 return blocking_notifier_chain_unregister(&module_notify_list, nb);
104 EXPORT_SYMBOL(unregister_module_notifier);
106 /* We require a truly strong try_module_get(): 0 means failure due to
107 ongoing or failed initialization etc. */
108 static inline int strong_try_module_get(struct module *mod)
110 if (mod && mod->state == MODULE_STATE_COMING)
111 return -EBUSY;
112 if (try_module_get(mod))
113 return 0;
114 else
115 return -ENOENT;
118 static inline void add_taint_module(struct module *mod, unsigned flag)
120 add_taint(flag);
121 mod->taints |= (1U << flag);
125 * A thread that wants to hold a reference to a module only while it
126 * is running can call this to safely exit. nfsd and lockd use this.
128 void __module_put_and_exit(struct module *mod, long code)
130 module_put(mod);
131 do_exit(code);
133 EXPORT_SYMBOL(__module_put_and_exit);
135 /* Find a module section: 0 means not found. */
136 static unsigned int find_sec(Elf_Ehdr *hdr,
137 Elf_Shdr *sechdrs,
138 const char *secstrings,
139 const char *name)
141 unsigned int i;
143 for (i = 1; i < hdr->e_shnum; i++)
144 /* Alloc bit cleared means "ignore it." */
145 if ((sechdrs[i].sh_flags & SHF_ALLOC)
146 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
147 return i;
148 return 0;
151 /* Find a module section, or NULL. */
152 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
153 const char *secstrings, const char *name)
155 /* Section 0 has sh_addr 0. */
156 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
159 /* Find a module section, or NULL. Fill in number of "objects" in section. */
160 static void *section_objs(Elf_Ehdr *hdr,
161 Elf_Shdr *sechdrs,
162 const char *secstrings,
163 const char *name,
164 size_t object_size,
165 unsigned int *num)
167 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
169 /* Section 0 has sh_addr 0 and sh_size 0. */
170 *num = sechdrs[sec].sh_size / object_size;
171 return (void *)sechdrs[sec].sh_addr;
174 /* Provided by the linker */
175 extern const struct kernel_symbol __start___ksymtab[];
176 extern const struct kernel_symbol __stop___ksymtab[];
177 extern const struct kernel_symbol __start___ksymtab_gpl[];
178 extern const struct kernel_symbol __stop___ksymtab_gpl[];
179 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
180 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
181 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
182 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
183 extern const unsigned long __start___kcrctab[];
184 extern const unsigned long __start___kcrctab_gpl[];
185 extern const unsigned long __start___kcrctab_gpl_future[];
186 #ifdef CONFIG_UNUSED_SYMBOLS
187 extern const struct kernel_symbol __start___ksymtab_unused[];
188 extern const struct kernel_symbol __stop___ksymtab_unused[];
189 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
190 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
191 extern const unsigned long __start___kcrctab_unused[];
192 extern const unsigned long __start___kcrctab_unused_gpl[];
193 #endif
195 #ifndef CONFIG_MODVERSIONS
196 #define symversion(base, idx) NULL
197 #else
198 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
199 #endif
201 static bool each_symbol_in_section(const struct symsearch *arr,
202 unsigned int arrsize,
203 struct module *owner,
204 bool (*fn)(const struct symsearch *syms,
205 struct module *owner,
206 unsigned int symnum, void *data),
207 void *data)
209 unsigned int i, j;
211 for (j = 0; j < arrsize; j++) {
212 for (i = 0; i < arr[j].stop - arr[j].start; i++)
213 if (fn(&arr[j], owner, i, data))
214 return true;
217 return false;
220 /* Returns true as soon as fn returns true, otherwise false. */
221 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
222 unsigned int symnum, void *data), void *data)
224 struct module *mod;
225 const struct symsearch arr[] = {
226 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
227 NOT_GPL_ONLY, false },
228 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
229 __start___kcrctab_gpl,
230 GPL_ONLY, false },
231 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
232 __start___kcrctab_gpl_future,
233 WILL_BE_GPL_ONLY, false },
234 #ifdef CONFIG_UNUSED_SYMBOLS
235 { __start___ksymtab_unused, __stop___ksymtab_unused,
236 __start___kcrctab_unused,
237 NOT_GPL_ONLY, true },
238 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
239 __start___kcrctab_unused_gpl,
240 GPL_ONLY, true },
241 #endif
244 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
245 return true;
247 list_for_each_entry_rcu(mod, &modules, list) {
248 struct symsearch arr[] = {
249 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
250 NOT_GPL_ONLY, false },
251 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
252 mod->gpl_crcs,
253 GPL_ONLY, false },
254 { mod->gpl_future_syms,
255 mod->gpl_future_syms + mod->num_gpl_future_syms,
256 mod->gpl_future_crcs,
257 WILL_BE_GPL_ONLY, false },
258 #ifdef CONFIG_UNUSED_SYMBOLS
259 { mod->unused_syms,
260 mod->unused_syms + mod->num_unused_syms,
261 mod->unused_crcs,
262 NOT_GPL_ONLY, true },
263 { mod->unused_gpl_syms,
264 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
265 mod->unused_gpl_crcs,
266 GPL_ONLY, true },
267 #endif
270 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
271 return true;
273 return false;
275 EXPORT_SYMBOL_GPL(each_symbol);
277 struct find_symbol_arg {
278 /* Input */
279 const char *name;
280 bool gplok;
281 bool warn;
283 /* Output */
284 struct module *owner;
285 const unsigned long *crc;
286 const struct kernel_symbol *sym;
289 static bool find_symbol_in_section(const struct symsearch *syms,
290 struct module *owner,
291 unsigned int symnum, void *data)
293 struct find_symbol_arg *fsa = data;
295 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
296 return false;
298 if (!fsa->gplok) {
299 if (syms->licence == GPL_ONLY)
300 return false;
301 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
302 printk(KERN_WARNING "Symbol %s is being used "
303 "by a non-GPL module, which will not "
304 "be allowed in the future\n", fsa->name);
305 printk(KERN_WARNING "Please see the file "
306 "Documentation/feature-removal-schedule.txt "
307 "in the kernel source tree for more details.\n");
311 #ifdef CONFIG_UNUSED_SYMBOLS
312 if (syms->unused && fsa->warn) {
313 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
314 "however this module is using it.\n", fsa->name);
315 printk(KERN_WARNING
316 "This symbol will go away in the future.\n");
317 printk(KERN_WARNING
318 "Please evalute if this is the right api to use and if "
319 "it really is, submit a report the linux kernel "
320 "mailinglist together with submitting your code for "
321 "inclusion.\n");
323 #endif
325 fsa->owner = owner;
326 fsa->crc = symversion(syms->crcs, symnum);
327 fsa->sym = &syms->start[symnum];
328 return true;
331 /* Find a symbol and return it, along with, (optional) crc and
332 * (optional) module which owns it */
333 const struct kernel_symbol *find_symbol(const char *name,
334 struct module **owner,
335 const unsigned long **crc,
336 bool gplok,
337 bool warn)
339 struct find_symbol_arg fsa;
341 fsa.name = name;
342 fsa.gplok = gplok;
343 fsa.warn = warn;
345 if (each_symbol(find_symbol_in_section, &fsa)) {
346 if (owner)
347 *owner = fsa.owner;
348 if (crc)
349 *crc = fsa.crc;
350 return fsa.sym;
353 DEBUGP("Failed to find symbol %s\n", name);
354 return NULL;
356 EXPORT_SYMBOL_GPL(find_symbol);
358 /* Search for module by name: must hold module_mutex. */
359 struct module *find_module(const char *name)
361 struct module *mod;
363 list_for_each_entry(mod, &modules, list) {
364 if (strcmp(mod->name, name) == 0)
365 return mod;
367 return NULL;
369 EXPORT_SYMBOL_GPL(find_module);
371 #ifdef CONFIG_SMP
373 static void *percpu_modalloc(unsigned long size, unsigned long align,
374 const char *name)
376 void *ptr;
378 if (align > PAGE_SIZE) {
379 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
380 name, align, PAGE_SIZE);
381 align = PAGE_SIZE;
384 ptr = __alloc_reserved_percpu(size, align);
385 if (!ptr)
386 printk(KERN_WARNING
387 "Could not allocate %lu bytes percpu data\n", size);
388 return ptr;
391 static void percpu_modfree(void *freeme)
393 free_percpu(freeme);
396 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
397 Elf_Shdr *sechdrs,
398 const char *secstrings)
400 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
403 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
405 int cpu;
407 for_each_possible_cpu(cpu)
408 memcpy(per_cpu_ptr(pcpudest, cpu), from, size);
411 #else /* ... !CONFIG_SMP */
413 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
414 const char *name)
416 return NULL;
418 static inline void percpu_modfree(void *pcpuptr)
420 BUG();
422 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
423 Elf_Shdr *sechdrs,
424 const char *secstrings)
426 return 0;
428 static inline void percpu_modcopy(void *pcpudst, const void *src,
429 unsigned long size)
431 /* pcpusec should be 0, and size of that section should be 0. */
432 BUG_ON(size != 0);
435 #endif /* CONFIG_SMP */
437 #define MODINFO_ATTR(field) \
438 static void setup_modinfo_##field(struct module *mod, const char *s) \
440 mod->field = kstrdup(s, GFP_KERNEL); \
442 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
443 struct module *mod, char *buffer) \
445 return sprintf(buffer, "%s\n", mod->field); \
447 static int modinfo_##field##_exists(struct module *mod) \
449 return mod->field != NULL; \
451 static void free_modinfo_##field(struct module *mod) \
453 kfree(mod->field); \
454 mod->field = NULL; \
456 static struct module_attribute modinfo_##field = { \
457 .attr = { .name = __stringify(field), .mode = 0444 }, \
458 .show = show_modinfo_##field, \
459 .setup = setup_modinfo_##field, \
460 .test = modinfo_##field##_exists, \
461 .free = free_modinfo_##field, \
464 MODINFO_ATTR(version);
465 MODINFO_ATTR(srcversion);
467 static char last_unloaded_module[MODULE_NAME_LEN+1];
469 #ifdef CONFIG_MODULE_UNLOAD
470 /* Init the unload section of the module. */
471 static void module_unload_init(struct module *mod)
473 int cpu;
475 INIT_LIST_HEAD(&mod->modules_which_use_me);
476 for_each_possible_cpu(cpu)
477 local_set(__module_ref_addr(mod, cpu), 0);
478 /* Hold reference count during initialization. */
479 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
480 /* Backwards compatibility macros put refcount during init. */
481 mod->waiter = current;
484 /* modules using other modules */
485 struct module_use
487 struct list_head list;
488 struct module *module_which_uses;
491 /* Does a already use b? */
492 static int already_uses(struct module *a, struct module *b)
494 struct module_use *use;
496 list_for_each_entry(use, &b->modules_which_use_me, list) {
497 if (use->module_which_uses == a) {
498 DEBUGP("%s uses %s!\n", a->name, b->name);
499 return 1;
502 DEBUGP("%s does not use %s!\n", a->name, b->name);
503 return 0;
506 /* Module a uses b */
507 int use_module(struct module *a, struct module *b)
509 struct module_use *use;
510 int no_warn, err;
512 if (b == NULL || already_uses(a, b)) return 1;
514 /* If we're interrupted or time out, we fail. */
515 if (wait_event_interruptible_timeout(
516 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
517 30 * HZ) <= 0) {
518 printk("%s: gave up waiting for init of module %s.\n",
519 a->name, b->name);
520 return 0;
523 /* If strong_try_module_get() returned a different error, we fail. */
524 if (err)
525 return 0;
527 DEBUGP("Allocating new usage for %s.\n", a->name);
528 use = kmalloc(sizeof(*use), GFP_ATOMIC);
529 if (!use) {
530 printk("%s: out of memory loading\n", a->name);
531 module_put(b);
532 return 0;
535 use->module_which_uses = a;
536 list_add(&use->list, &b->modules_which_use_me);
537 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
538 return 1;
540 EXPORT_SYMBOL_GPL(use_module);
542 /* Clear the unload stuff of the module. */
543 static void module_unload_free(struct module *mod)
545 struct module *i;
547 list_for_each_entry(i, &modules, list) {
548 struct module_use *use;
550 list_for_each_entry(use, &i->modules_which_use_me, list) {
551 if (use->module_which_uses == mod) {
552 DEBUGP("%s unusing %s\n", mod->name, i->name);
553 module_put(i);
554 list_del(&use->list);
555 kfree(use);
556 sysfs_remove_link(i->holders_dir, mod->name);
557 /* There can be at most one match. */
558 break;
564 #ifdef CONFIG_MODULE_FORCE_UNLOAD
565 static inline int try_force_unload(unsigned int flags)
567 int ret = (flags & O_TRUNC);
568 if (ret)
569 add_taint(TAINT_FORCED_RMMOD);
570 return ret;
572 #else
573 static inline int try_force_unload(unsigned int flags)
575 return 0;
577 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
579 struct stopref
581 struct module *mod;
582 int flags;
583 int *forced;
586 /* Whole machine is stopped with interrupts off when this runs. */
587 static int __try_stop_module(void *_sref)
589 struct stopref *sref = _sref;
591 /* If it's not unused, quit unless we're forcing. */
592 if (module_refcount(sref->mod) != 0) {
593 if (!(*sref->forced = try_force_unload(sref->flags)))
594 return -EWOULDBLOCK;
597 /* Mark it as dying. */
598 sref->mod->state = MODULE_STATE_GOING;
599 return 0;
602 static int try_stop_module(struct module *mod, int flags, int *forced)
604 if (flags & O_NONBLOCK) {
605 struct stopref sref = { mod, flags, forced };
607 return stop_machine(__try_stop_module, &sref, NULL);
608 } else {
609 /* We don't need to stop the machine for this. */
610 mod->state = MODULE_STATE_GOING;
611 synchronize_sched();
612 return 0;
616 unsigned int module_refcount(struct module *mod)
618 unsigned int total = 0;
619 int cpu;
621 for_each_possible_cpu(cpu)
622 total += local_read(__module_ref_addr(mod, cpu));
623 return total;
625 EXPORT_SYMBOL(module_refcount);
627 /* This exists whether we can unload or not */
628 static void free_module(struct module *mod);
630 static void wait_for_zero_refcount(struct module *mod)
632 /* Since we might sleep for some time, release the mutex first */
633 mutex_unlock(&module_mutex);
634 for (;;) {
635 DEBUGP("Looking at refcount...\n");
636 set_current_state(TASK_UNINTERRUPTIBLE);
637 if (module_refcount(mod) == 0)
638 break;
639 schedule();
641 current->state = TASK_RUNNING;
642 mutex_lock(&module_mutex);
645 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
646 unsigned int, flags)
648 struct module *mod;
649 char name[MODULE_NAME_LEN];
650 int ret, forced = 0;
652 if (!capable(CAP_SYS_MODULE) || modules_disabled)
653 return -EPERM;
655 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
656 return -EFAULT;
657 name[MODULE_NAME_LEN-1] = '\0';
659 /* Create stop_machine threads since free_module relies on
660 * a non-failing stop_machine call. */
661 ret = stop_machine_create();
662 if (ret)
663 return ret;
665 if (mutex_lock_interruptible(&module_mutex) != 0) {
666 ret = -EINTR;
667 goto out_stop;
670 mod = find_module(name);
671 if (!mod) {
672 ret = -ENOENT;
673 goto out;
676 if (!list_empty(&mod->modules_which_use_me)) {
677 /* Other modules depend on us: get rid of them first. */
678 ret = -EWOULDBLOCK;
679 goto out;
682 /* Doing init or already dying? */
683 if (mod->state != MODULE_STATE_LIVE) {
684 /* FIXME: if (force), slam module count and wake up
685 waiter --RR */
686 DEBUGP("%s already dying\n", mod->name);
687 ret = -EBUSY;
688 goto out;
691 /* If it has an init func, it must have an exit func to unload */
692 if (mod->init && !mod->exit) {
693 forced = try_force_unload(flags);
694 if (!forced) {
695 /* This module can't be removed */
696 ret = -EBUSY;
697 goto out;
701 /* Set this up before setting mod->state */
702 mod->waiter = current;
704 /* Stop the machine so refcounts can't move and disable module. */
705 ret = try_stop_module(mod, flags, &forced);
706 if (ret != 0)
707 goto out;
709 /* Never wait if forced. */
710 if (!forced && module_refcount(mod) != 0)
711 wait_for_zero_refcount(mod);
713 mutex_unlock(&module_mutex);
714 /* Final destruction now noone is using it. */
715 if (mod->exit != NULL)
716 mod->exit();
717 blocking_notifier_call_chain(&module_notify_list,
718 MODULE_STATE_GOING, mod);
719 async_synchronize_full();
720 mutex_lock(&module_mutex);
721 /* Store the name of the last unloaded module for diagnostic purposes */
722 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
723 free_module(mod);
725 out:
726 mutex_unlock(&module_mutex);
727 out_stop:
728 stop_machine_destroy();
729 return ret;
732 static inline void print_unload_info(struct seq_file *m, struct module *mod)
734 struct module_use *use;
735 int printed_something = 0;
737 seq_printf(m, " %u ", module_refcount(mod));
739 /* Always include a trailing , so userspace can differentiate
740 between this and the old multi-field proc format. */
741 list_for_each_entry(use, &mod->modules_which_use_me, list) {
742 printed_something = 1;
743 seq_printf(m, "%s,", use->module_which_uses->name);
746 if (mod->init != NULL && mod->exit == NULL) {
747 printed_something = 1;
748 seq_printf(m, "[permanent],");
751 if (!printed_something)
752 seq_printf(m, "-");
755 void __symbol_put(const char *symbol)
757 struct module *owner;
759 preempt_disable();
760 if (!find_symbol(symbol, &owner, NULL, true, false))
761 BUG();
762 module_put(owner);
763 preempt_enable();
765 EXPORT_SYMBOL(__symbol_put);
767 /* Note this assumes addr is a function, which it currently always is. */
768 void symbol_put_addr(void *addr)
770 struct module *modaddr;
771 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
773 if (core_kernel_text(a))
774 return;
776 /* module_text_address is safe here: we're supposed to have reference
777 * to module from symbol_get, so it can't go away. */
778 modaddr = __module_text_address(a);
779 BUG_ON(!modaddr);
780 module_put(modaddr);
782 EXPORT_SYMBOL_GPL(symbol_put_addr);
784 static ssize_t show_refcnt(struct module_attribute *mattr,
785 struct module *mod, char *buffer)
787 return sprintf(buffer, "%u\n", module_refcount(mod));
790 static struct module_attribute refcnt = {
791 .attr = { .name = "refcnt", .mode = 0444 },
792 .show = show_refcnt,
795 void module_put(struct module *module)
797 if (module) {
798 unsigned int cpu = get_cpu();
799 local_dec(__module_ref_addr(module, cpu));
800 trace_module_put(module, _RET_IP_,
801 local_read(__module_ref_addr(module, cpu)));
802 /* Maybe they're waiting for us to drop reference? */
803 if (unlikely(!module_is_live(module)))
804 wake_up_process(module->waiter);
805 put_cpu();
808 EXPORT_SYMBOL(module_put);
810 #else /* !CONFIG_MODULE_UNLOAD */
811 static inline void print_unload_info(struct seq_file *m, struct module *mod)
813 /* We don't know the usage count, or what modules are using. */
814 seq_printf(m, " - -");
817 static inline void module_unload_free(struct module *mod)
821 int use_module(struct module *a, struct module *b)
823 return strong_try_module_get(b) == 0;
825 EXPORT_SYMBOL_GPL(use_module);
827 static inline void module_unload_init(struct module *mod)
830 #endif /* CONFIG_MODULE_UNLOAD */
832 static ssize_t show_initstate(struct module_attribute *mattr,
833 struct module *mod, char *buffer)
835 const char *state = "unknown";
837 switch (mod->state) {
838 case MODULE_STATE_LIVE:
839 state = "live";
840 break;
841 case MODULE_STATE_COMING:
842 state = "coming";
843 break;
844 case MODULE_STATE_GOING:
845 state = "going";
846 break;
848 return sprintf(buffer, "%s\n", state);
851 static struct module_attribute initstate = {
852 .attr = { .name = "initstate", .mode = 0444 },
853 .show = show_initstate,
856 static struct module_attribute *modinfo_attrs[] = {
857 &modinfo_version,
858 &modinfo_srcversion,
859 &initstate,
860 #ifdef CONFIG_MODULE_UNLOAD
861 &refcnt,
862 #endif
863 NULL,
866 static const char vermagic[] = VERMAGIC_STRING;
868 static int try_to_force_load(struct module *mod, const char *reason)
870 #ifdef CONFIG_MODULE_FORCE_LOAD
871 if (!test_taint(TAINT_FORCED_MODULE))
872 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
873 mod->name, reason);
874 add_taint_module(mod, TAINT_FORCED_MODULE);
875 return 0;
876 #else
877 return -ENOEXEC;
878 #endif
881 #ifdef CONFIG_MODVERSIONS
882 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
883 static unsigned long maybe_relocated(unsigned long crc,
884 const struct module *crc_owner)
886 #ifdef ARCH_RELOCATES_KCRCTAB
887 if (crc_owner == NULL)
888 return crc - (unsigned long)reloc_start;
889 #endif
890 return crc;
893 static int check_version(Elf_Shdr *sechdrs,
894 unsigned int versindex,
895 const char *symname,
896 struct module *mod,
897 const unsigned long *crc,
898 const struct module *crc_owner)
900 unsigned int i, num_versions;
901 struct modversion_info *versions;
903 /* Exporting module didn't supply crcs? OK, we're already tainted. */
904 if (!crc)
905 return 1;
907 /* No versions at all? modprobe --force does this. */
908 if (versindex == 0)
909 return try_to_force_load(mod, symname) == 0;
911 versions = (void *) sechdrs[versindex].sh_addr;
912 num_versions = sechdrs[versindex].sh_size
913 / sizeof(struct modversion_info);
915 for (i = 0; i < num_versions; i++) {
916 if (strcmp(versions[i].name, symname) != 0)
917 continue;
919 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
920 return 1;
921 DEBUGP("Found checksum %lX vs module %lX\n",
922 maybe_relocated(*crc, crc_owner), versions[i].crc);
923 goto bad_version;
926 printk(KERN_WARNING "%s: no symbol version for %s\n",
927 mod->name, symname);
928 return 0;
930 bad_version:
931 printk("%s: disagrees about version of symbol %s\n",
932 mod->name, symname);
933 return 0;
936 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
937 unsigned int versindex,
938 struct module *mod)
940 const unsigned long *crc;
942 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
943 &crc, true, false))
944 BUG();
945 return check_version(sechdrs, versindex, "module_layout", mod, crc,
946 NULL);
949 /* First part is kernel version, which we ignore if module has crcs. */
950 static inline int same_magic(const char *amagic, const char *bmagic,
951 bool has_crcs)
953 if (has_crcs) {
954 amagic += strcspn(amagic, " ");
955 bmagic += strcspn(bmagic, " ");
957 return strcmp(amagic, bmagic) == 0;
959 #else
960 static inline int check_version(Elf_Shdr *sechdrs,
961 unsigned int versindex,
962 const char *symname,
963 struct module *mod,
964 const unsigned long *crc,
965 const struct module *crc_owner)
967 return 1;
970 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
971 unsigned int versindex,
972 struct module *mod)
974 return 1;
977 static inline int same_magic(const char *amagic, const char *bmagic,
978 bool has_crcs)
980 return strcmp(amagic, bmagic) == 0;
982 #endif /* CONFIG_MODVERSIONS */
984 /* Resolve a symbol for this module. I.e. if we find one, record usage.
985 Must be holding module_mutex. */
986 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
987 unsigned int versindex,
988 const char *name,
989 struct module *mod)
991 struct module *owner;
992 const struct kernel_symbol *sym;
993 const unsigned long *crc;
995 sym = find_symbol(name, &owner, &crc,
996 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
997 /* use_module can fail due to OOM,
998 or module initialization or unloading */
999 if (sym) {
1000 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1001 || !use_module(mod, owner))
1002 sym = NULL;
1004 return sym;
1008 * /sys/module/foo/sections stuff
1009 * J. Corbet <corbet@lwn.net>
1011 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1013 static inline bool sect_empty(const Elf_Shdr *sect)
1015 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1018 struct module_sect_attr
1020 struct module_attribute mattr;
1021 char *name;
1022 unsigned long address;
1025 struct module_sect_attrs
1027 struct attribute_group grp;
1028 unsigned int nsections;
1029 struct module_sect_attr attrs[0];
1032 static ssize_t module_sect_show(struct module_attribute *mattr,
1033 struct module *mod, char *buf)
1035 struct module_sect_attr *sattr =
1036 container_of(mattr, struct module_sect_attr, mattr);
1037 return sprintf(buf, "0x%lx\n", sattr->address);
1040 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1042 unsigned int section;
1044 for (section = 0; section < sect_attrs->nsections; section++)
1045 kfree(sect_attrs->attrs[section].name);
1046 kfree(sect_attrs);
1049 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1050 char *secstrings, Elf_Shdr *sechdrs)
1052 unsigned int nloaded = 0, i, size[2];
1053 struct module_sect_attrs *sect_attrs;
1054 struct module_sect_attr *sattr;
1055 struct attribute **gattr;
1057 /* Count loaded sections and allocate structures */
1058 for (i = 0; i < nsect; i++)
1059 if (!sect_empty(&sechdrs[i]))
1060 nloaded++;
1061 size[0] = ALIGN(sizeof(*sect_attrs)
1062 + nloaded * sizeof(sect_attrs->attrs[0]),
1063 sizeof(sect_attrs->grp.attrs[0]));
1064 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1065 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1066 if (sect_attrs == NULL)
1067 return;
1069 /* Setup section attributes. */
1070 sect_attrs->grp.name = "sections";
1071 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1073 sect_attrs->nsections = 0;
1074 sattr = &sect_attrs->attrs[0];
1075 gattr = &sect_attrs->grp.attrs[0];
1076 for (i = 0; i < nsect; i++) {
1077 if (sect_empty(&sechdrs[i]))
1078 continue;
1079 sattr->address = sechdrs[i].sh_addr;
1080 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1081 GFP_KERNEL);
1082 if (sattr->name == NULL)
1083 goto out;
1084 sect_attrs->nsections++;
1085 sattr->mattr.show = module_sect_show;
1086 sattr->mattr.store = NULL;
1087 sattr->mattr.attr.name = sattr->name;
1088 sattr->mattr.attr.mode = S_IRUGO;
1089 *(gattr++) = &(sattr++)->mattr.attr;
1091 *gattr = NULL;
1093 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1094 goto out;
1096 mod->sect_attrs = sect_attrs;
1097 return;
1098 out:
1099 free_sect_attrs(sect_attrs);
1102 static void remove_sect_attrs(struct module *mod)
1104 if (mod->sect_attrs) {
1105 sysfs_remove_group(&mod->mkobj.kobj,
1106 &mod->sect_attrs->grp);
1107 /* We are positive that no one is using any sect attrs
1108 * at this point. Deallocate immediately. */
1109 free_sect_attrs(mod->sect_attrs);
1110 mod->sect_attrs = NULL;
1115 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1118 struct module_notes_attrs {
1119 struct kobject *dir;
1120 unsigned int notes;
1121 struct bin_attribute attrs[0];
1124 static ssize_t module_notes_read(struct kobject *kobj,
1125 struct bin_attribute *bin_attr,
1126 char *buf, loff_t pos, size_t count)
1129 * The caller checked the pos and count against our size.
1131 memcpy(buf, bin_attr->private + pos, count);
1132 return count;
1135 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1136 unsigned int i)
1138 if (notes_attrs->dir) {
1139 while (i-- > 0)
1140 sysfs_remove_bin_file(notes_attrs->dir,
1141 &notes_attrs->attrs[i]);
1142 kobject_put(notes_attrs->dir);
1144 kfree(notes_attrs);
1147 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1148 char *secstrings, Elf_Shdr *sechdrs)
1150 unsigned int notes, loaded, i;
1151 struct module_notes_attrs *notes_attrs;
1152 struct bin_attribute *nattr;
1154 /* failed to create section attributes, so can't create notes */
1155 if (!mod->sect_attrs)
1156 return;
1158 /* Count notes sections and allocate structures. */
1159 notes = 0;
1160 for (i = 0; i < nsect; i++)
1161 if (!sect_empty(&sechdrs[i]) &&
1162 (sechdrs[i].sh_type == SHT_NOTE))
1163 ++notes;
1165 if (notes == 0)
1166 return;
1168 notes_attrs = kzalloc(sizeof(*notes_attrs)
1169 + notes * sizeof(notes_attrs->attrs[0]),
1170 GFP_KERNEL);
1171 if (notes_attrs == NULL)
1172 return;
1174 notes_attrs->notes = notes;
1175 nattr = &notes_attrs->attrs[0];
1176 for (loaded = i = 0; i < nsect; ++i) {
1177 if (sect_empty(&sechdrs[i]))
1178 continue;
1179 if (sechdrs[i].sh_type == SHT_NOTE) {
1180 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1181 nattr->attr.mode = S_IRUGO;
1182 nattr->size = sechdrs[i].sh_size;
1183 nattr->private = (void *) sechdrs[i].sh_addr;
1184 nattr->read = module_notes_read;
1185 ++nattr;
1187 ++loaded;
1190 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1191 if (!notes_attrs->dir)
1192 goto out;
1194 for (i = 0; i < notes; ++i)
1195 if (sysfs_create_bin_file(notes_attrs->dir,
1196 &notes_attrs->attrs[i]))
1197 goto out;
1199 mod->notes_attrs = notes_attrs;
1200 return;
1202 out:
1203 free_notes_attrs(notes_attrs, i);
1206 static void remove_notes_attrs(struct module *mod)
1208 if (mod->notes_attrs)
1209 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1212 #else
1214 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1215 char *sectstrings, Elf_Shdr *sechdrs)
1219 static inline void remove_sect_attrs(struct module *mod)
1223 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1224 char *sectstrings, Elf_Shdr *sechdrs)
1228 static inline void remove_notes_attrs(struct module *mod)
1231 #endif
1233 #ifdef CONFIG_SYSFS
1234 int module_add_modinfo_attrs(struct module *mod)
1236 struct module_attribute *attr;
1237 struct module_attribute *temp_attr;
1238 int error = 0;
1239 int i;
1241 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1242 (ARRAY_SIZE(modinfo_attrs) + 1)),
1243 GFP_KERNEL);
1244 if (!mod->modinfo_attrs)
1245 return -ENOMEM;
1247 temp_attr = mod->modinfo_attrs;
1248 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1249 if (!attr->test ||
1250 (attr->test && attr->test(mod))) {
1251 memcpy(temp_attr, attr, sizeof(*temp_attr));
1252 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1253 ++temp_attr;
1256 return error;
1259 void module_remove_modinfo_attrs(struct module *mod)
1261 struct module_attribute *attr;
1262 int i;
1264 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1265 /* pick a field to test for end of list */
1266 if (!attr->attr.name)
1267 break;
1268 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1269 if (attr->free)
1270 attr->free(mod);
1272 kfree(mod->modinfo_attrs);
1275 int mod_sysfs_init(struct module *mod)
1277 int err;
1278 struct kobject *kobj;
1280 if (!module_sysfs_initialized) {
1281 printk(KERN_ERR "%s: module sysfs not initialized\n",
1282 mod->name);
1283 err = -EINVAL;
1284 goto out;
1287 kobj = kset_find_obj(module_kset, mod->name);
1288 if (kobj) {
1289 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1290 kobject_put(kobj);
1291 err = -EINVAL;
1292 goto out;
1295 mod->mkobj.mod = mod;
1297 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1298 mod->mkobj.kobj.kset = module_kset;
1299 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1300 "%s", mod->name);
1301 if (err)
1302 kobject_put(&mod->mkobj.kobj);
1304 /* delay uevent until full sysfs population */
1305 out:
1306 return err;
1309 int mod_sysfs_setup(struct module *mod,
1310 struct kernel_param *kparam,
1311 unsigned int num_params)
1313 int err;
1315 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1316 if (!mod->holders_dir) {
1317 err = -ENOMEM;
1318 goto out_unreg;
1321 err = module_param_sysfs_setup(mod, kparam, num_params);
1322 if (err)
1323 goto out_unreg_holders;
1325 err = module_add_modinfo_attrs(mod);
1326 if (err)
1327 goto out_unreg_param;
1329 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1330 return 0;
1332 out_unreg_param:
1333 module_param_sysfs_remove(mod);
1334 out_unreg_holders:
1335 kobject_put(mod->holders_dir);
1336 out_unreg:
1337 kobject_put(&mod->mkobj.kobj);
1338 return err;
1341 static void mod_sysfs_fini(struct module *mod)
1343 kobject_put(&mod->mkobj.kobj);
1346 #else /* CONFIG_SYSFS */
1348 static void mod_sysfs_fini(struct module *mod)
1352 #endif /* CONFIG_SYSFS */
1354 static void mod_kobject_remove(struct module *mod)
1356 module_remove_modinfo_attrs(mod);
1357 module_param_sysfs_remove(mod);
1358 kobject_put(mod->mkobj.drivers_dir);
1359 kobject_put(mod->holders_dir);
1360 mod_sysfs_fini(mod);
1364 * unlink the module with the whole machine is stopped with interrupts off
1365 * - this defends against kallsyms not taking locks
1367 static int __unlink_module(void *_mod)
1369 struct module *mod = _mod;
1370 list_del(&mod->list);
1371 return 0;
1374 /* Free a module, remove from lists, etc (must hold module_mutex). */
1375 static void free_module(struct module *mod)
1377 trace_module_free(mod);
1379 /* Delete from various lists */
1380 stop_machine(__unlink_module, mod, NULL);
1381 remove_notes_attrs(mod);
1382 remove_sect_attrs(mod);
1383 mod_kobject_remove(mod);
1385 /* Remove dynamic debug info */
1386 ddebug_remove_module(mod->name);
1388 /* Arch-specific cleanup. */
1389 module_arch_cleanup(mod);
1391 /* Module unload stuff */
1392 module_unload_free(mod);
1394 /* Free any allocated parameters. */
1395 destroy_params(mod->kp, mod->num_kp);
1397 /* This may be NULL, but that's OK */
1398 module_free(mod, mod->module_init);
1399 kfree(mod->args);
1400 if (mod->percpu)
1401 percpu_modfree(mod->percpu);
1402 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1403 if (mod->refptr)
1404 percpu_modfree(mod->refptr);
1405 #endif
1406 /* Free lock-classes: */
1407 lockdep_free_key_range(mod->module_core, mod->core_size);
1409 /* Finally, free the core (containing the module structure) */
1410 module_free(mod, mod->module_core);
1412 #ifdef CONFIG_MPU
1413 update_protections(current->mm);
1414 #endif
1417 void *__symbol_get(const char *symbol)
1419 struct module *owner;
1420 const struct kernel_symbol *sym;
1422 preempt_disable();
1423 sym = find_symbol(symbol, &owner, NULL, true, true);
1424 if (sym && strong_try_module_get(owner))
1425 sym = NULL;
1426 preempt_enable();
1428 return sym ? (void *)sym->value : NULL;
1430 EXPORT_SYMBOL_GPL(__symbol_get);
1433 * Ensure that an exported symbol [global namespace] does not already exist
1434 * in the kernel or in some other module's exported symbol table.
1436 static int verify_export_symbols(struct module *mod)
1438 unsigned int i;
1439 struct module *owner;
1440 const struct kernel_symbol *s;
1441 struct {
1442 const struct kernel_symbol *sym;
1443 unsigned int num;
1444 } arr[] = {
1445 { mod->syms, mod->num_syms },
1446 { mod->gpl_syms, mod->num_gpl_syms },
1447 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1448 #ifdef CONFIG_UNUSED_SYMBOLS
1449 { mod->unused_syms, mod->num_unused_syms },
1450 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1451 #endif
1454 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1455 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1456 if (find_symbol(s->name, &owner, NULL, true, false)) {
1457 printk(KERN_ERR
1458 "%s: exports duplicate symbol %s"
1459 " (owned by %s)\n",
1460 mod->name, s->name, module_name(owner));
1461 return -ENOEXEC;
1465 return 0;
1468 /* Change all symbols so that st_value encodes the pointer directly. */
1469 static int simplify_symbols(Elf_Shdr *sechdrs,
1470 unsigned int symindex,
1471 const char *strtab,
1472 unsigned int versindex,
1473 unsigned int pcpuindex,
1474 struct module *mod)
1476 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1477 unsigned long secbase;
1478 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1479 int ret = 0;
1480 const struct kernel_symbol *ksym;
1482 for (i = 1; i < n; i++) {
1483 switch (sym[i].st_shndx) {
1484 case SHN_COMMON:
1485 /* We compiled with -fno-common. These are not
1486 supposed to happen. */
1487 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1488 printk("%s: please compile with -fno-common\n",
1489 mod->name);
1490 ret = -ENOEXEC;
1491 break;
1493 case SHN_ABS:
1494 /* Don't need to do anything */
1495 DEBUGP("Absolute symbol: 0x%08lx\n",
1496 (long)sym[i].st_value);
1497 break;
1499 case SHN_UNDEF:
1500 ksym = resolve_symbol(sechdrs, versindex,
1501 strtab + sym[i].st_name, mod);
1502 /* Ok if resolved. */
1503 if (ksym) {
1504 sym[i].st_value = ksym->value;
1505 break;
1508 /* Ok if weak. */
1509 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1510 break;
1512 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1513 mod->name, strtab + sym[i].st_name);
1514 ret = -ENOENT;
1515 break;
1517 default:
1518 /* Divert to percpu allocation if a percpu var. */
1519 if (sym[i].st_shndx == pcpuindex)
1520 secbase = (unsigned long)mod->percpu;
1521 else
1522 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1523 sym[i].st_value += secbase;
1524 break;
1528 return ret;
1531 /* Additional bytes needed by arch in front of individual sections */
1532 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1533 unsigned int section)
1535 /* default implementation just returns zero */
1536 return 0;
1539 /* Update size with this section: return offset. */
1540 static long get_offset(struct module *mod, unsigned int *size,
1541 Elf_Shdr *sechdr, unsigned int section)
1543 long ret;
1545 *size += arch_mod_section_prepend(mod, section);
1546 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1547 *size = ret + sechdr->sh_size;
1548 return ret;
1551 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1552 might -- code, read-only data, read-write data, small data. Tally
1553 sizes, and place the offsets into sh_entsize fields: high bit means it
1554 belongs in init. */
1555 static void layout_sections(struct module *mod,
1556 const Elf_Ehdr *hdr,
1557 Elf_Shdr *sechdrs,
1558 const char *secstrings)
1560 static unsigned long const masks[][2] = {
1561 /* NOTE: all executable code must be the first section
1562 * in this array; otherwise modify the text_size
1563 * finder in the two loops below */
1564 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1565 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1566 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1567 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1569 unsigned int m, i;
1571 for (i = 0; i < hdr->e_shnum; i++)
1572 sechdrs[i].sh_entsize = ~0UL;
1574 DEBUGP("Core section allocation order:\n");
1575 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1576 for (i = 0; i < hdr->e_shnum; ++i) {
1577 Elf_Shdr *s = &sechdrs[i];
1579 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1580 || (s->sh_flags & masks[m][1])
1581 || s->sh_entsize != ~0UL
1582 || strstarts(secstrings + s->sh_name, ".init"))
1583 continue;
1584 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1585 DEBUGP("\t%s\n", secstrings + s->sh_name);
1587 if (m == 0)
1588 mod->core_text_size = mod->core_size;
1591 DEBUGP("Init section allocation order:\n");
1592 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1593 for (i = 0; i < hdr->e_shnum; ++i) {
1594 Elf_Shdr *s = &sechdrs[i];
1596 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1597 || (s->sh_flags & masks[m][1])
1598 || s->sh_entsize != ~0UL
1599 || !strstarts(secstrings + s->sh_name, ".init"))
1600 continue;
1601 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1602 | INIT_OFFSET_MASK);
1603 DEBUGP("\t%s\n", secstrings + s->sh_name);
1605 if (m == 0)
1606 mod->init_text_size = mod->init_size;
1610 static void set_license(struct module *mod, const char *license)
1612 if (!license)
1613 license = "unspecified";
1615 if (!license_is_gpl_compatible(license)) {
1616 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1617 printk(KERN_WARNING "%s: module license '%s' taints "
1618 "kernel.\n", mod->name, license);
1619 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1623 /* Parse tag=value strings from .modinfo section */
1624 static char *next_string(char *string, unsigned long *secsize)
1626 /* Skip non-zero chars */
1627 while (string[0]) {
1628 string++;
1629 if ((*secsize)-- <= 1)
1630 return NULL;
1633 /* Skip any zero padding. */
1634 while (!string[0]) {
1635 string++;
1636 if ((*secsize)-- <= 1)
1637 return NULL;
1639 return string;
1642 static char *get_modinfo(Elf_Shdr *sechdrs,
1643 unsigned int info,
1644 const char *tag)
1646 char *p;
1647 unsigned int taglen = strlen(tag);
1648 unsigned long size = sechdrs[info].sh_size;
1650 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1651 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1652 return p + taglen + 1;
1654 return NULL;
1657 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1658 unsigned int infoindex)
1660 struct module_attribute *attr;
1661 int i;
1663 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1664 if (attr->setup)
1665 attr->setup(mod,
1666 get_modinfo(sechdrs,
1667 infoindex,
1668 attr->attr.name));
1672 static void free_modinfo(struct module *mod)
1674 struct module_attribute *attr;
1675 int i;
1677 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1678 if (attr->free)
1679 attr->free(mod);
1683 #ifdef CONFIG_KALLSYMS
1685 /* lookup symbol in given range of kernel_symbols */
1686 static const struct kernel_symbol *lookup_symbol(const char *name,
1687 const struct kernel_symbol *start,
1688 const struct kernel_symbol *stop)
1690 const struct kernel_symbol *ks = start;
1691 for (; ks < stop; ks++)
1692 if (strcmp(ks->name, name) == 0)
1693 return ks;
1694 return NULL;
1697 static int is_exported(const char *name, unsigned long value,
1698 const struct module *mod)
1700 const struct kernel_symbol *ks;
1701 if (!mod)
1702 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1703 else
1704 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1705 return ks != NULL && ks->value == value;
1708 /* As per nm */
1709 static char elf_type(const Elf_Sym *sym,
1710 Elf_Shdr *sechdrs,
1711 const char *secstrings,
1712 struct module *mod)
1714 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1715 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1716 return 'v';
1717 else
1718 return 'w';
1720 if (sym->st_shndx == SHN_UNDEF)
1721 return 'U';
1722 if (sym->st_shndx == SHN_ABS)
1723 return 'a';
1724 if (sym->st_shndx >= SHN_LORESERVE)
1725 return '?';
1726 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1727 return 't';
1728 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1729 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1730 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1731 return 'r';
1732 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1733 return 'g';
1734 else
1735 return 'd';
1737 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1738 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1739 return 's';
1740 else
1741 return 'b';
1743 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1744 return 'n';
1745 return '?';
1748 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1749 unsigned int shnum)
1751 const Elf_Shdr *sec;
1753 if (src->st_shndx == SHN_UNDEF
1754 || src->st_shndx >= shnum
1755 || !src->st_name)
1756 return false;
1758 sec = sechdrs + src->st_shndx;
1759 if (!(sec->sh_flags & SHF_ALLOC)
1760 #ifndef CONFIG_KALLSYMS_ALL
1761 || !(sec->sh_flags & SHF_EXECINSTR)
1762 #endif
1763 || (sec->sh_entsize & INIT_OFFSET_MASK))
1764 return false;
1766 return true;
1769 static unsigned long layout_symtab(struct module *mod,
1770 Elf_Shdr *sechdrs,
1771 unsigned int symindex,
1772 unsigned int strindex,
1773 const Elf_Ehdr *hdr,
1774 const char *secstrings,
1775 unsigned long *pstroffs,
1776 unsigned long *strmap)
1778 unsigned long symoffs;
1779 Elf_Shdr *symsect = sechdrs + symindex;
1780 Elf_Shdr *strsect = sechdrs + strindex;
1781 const Elf_Sym *src;
1782 const char *strtab;
1783 unsigned int i, nsrc, ndst;
1785 /* Put symbol section at end of init part of module. */
1786 symsect->sh_flags |= SHF_ALLOC;
1787 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1788 symindex) | INIT_OFFSET_MASK;
1789 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1791 src = (void *)hdr + symsect->sh_offset;
1792 nsrc = symsect->sh_size / sizeof(*src);
1793 strtab = (void *)hdr + strsect->sh_offset;
1794 for (ndst = i = 1; i < nsrc; ++i, ++src)
1795 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1796 unsigned int j = src->st_name;
1798 while(!__test_and_set_bit(j, strmap) && strtab[j])
1799 ++j;
1800 ++ndst;
1803 /* Append room for core symbols at end of core part. */
1804 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1805 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1807 /* Put string table section at end of init part of module. */
1808 strsect->sh_flags |= SHF_ALLOC;
1809 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1810 strindex) | INIT_OFFSET_MASK;
1811 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1813 /* Append room for core symbols' strings at end of core part. */
1814 *pstroffs = mod->core_size;
1815 __set_bit(0, strmap);
1816 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1818 return symoffs;
1821 static void add_kallsyms(struct module *mod,
1822 Elf_Shdr *sechdrs,
1823 unsigned int shnum,
1824 unsigned int symindex,
1825 unsigned int strindex,
1826 unsigned long symoffs,
1827 unsigned long stroffs,
1828 const char *secstrings,
1829 unsigned long *strmap)
1831 unsigned int i, ndst;
1832 const Elf_Sym *src;
1833 Elf_Sym *dst;
1834 char *s;
1836 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1837 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1838 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1840 /* Set types up while we still have access to sections. */
1841 for (i = 0; i < mod->num_symtab; i++)
1842 mod->symtab[i].st_info
1843 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1845 mod->core_symtab = dst = mod->module_core + symoffs;
1846 src = mod->symtab;
1847 *dst = *src;
1848 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1849 if (!is_core_symbol(src, sechdrs, shnum))
1850 continue;
1851 dst[ndst] = *src;
1852 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1853 ++ndst;
1855 mod->core_num_syms = ndst;
1857 mod->core_strtab = s = mod->module_core + stroffs;
1858 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1859 if (test_bit(i, strmap))
1860 *++s = mod->strtab[i];
1862 #else
1863 static inline unsigned long layout_symtab(struct module *mod,
1864 Elf_Shdr *sechdrs,
1865 unsigned int symindex,
1866 unsigned int strindex,
1867 const Elf_Ehdr *hdr,
1868 const char *secstrings,
1869 unsigned long *pstroffs,
1870 unsigned long *strmap)
1872 return 0;
1875 static inline void add_kallsyms(struct module *mod,
1876 Elf_Shdr *sechdrs,
1877 unsigned int shnum,
1878 unsigned int symindex,
1879 unsigned int strindex,
1880 unsigned long symoffs,
1881 unsigned long stroffs,
1882 const char *secstrings,
1883 const unsigned long *strmap)
1886 #endif /* CONFIG_KALLSYMS */
1888 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1890 #ifdef CONFIG_DYNAMIC_DEBUG
1891 if (ddebug_add_module(debug, num, debug->modname))
1892 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1893 debug->modname);
1894 #endif
1897 static void *module_alloc_update_bounds(unsigned long size)
1899 void *ret = module_alloc(size);
1901 if (ret) {
1902 /* Update module bounds. */
1903 if ((unsigned long)ret < module_addr_min)
1904 module_addr_min = (unsigned long)ret;
1905 if ((unsigned long)ret + size > module_addr_max)
1906 module_addr_max = (unsigned long)ret + size;
1908 return ret;
1911 #ifdef CONFIG_DEBUG_KMEMLEAK
1912 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1913 Elf_Shdr *sechdrs, char *secstrings)
1915 unsigned int i;
1917 /* only scan the sections containing data */
1918 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1920 for (i = 1; i < hdr->e_shnum; i++) {
1921 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1922 continue;
1923 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1924 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1925 continue;
1927 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1928 sechdrs[i].sh_size, GFP_KERNEL);
1931 #else
1932 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1933 Elf_Shdr *sechdrs, char *secstrings)
1936 #endif
1938 /* Allocate and load the module: note that size of section 0 is always
1939 zero, and we rely on this for optional sections. */
1940 static noinline struct module *load_module(void __user *umod,
1941 unsigned long len,
1942 const char __user *uargs)
1944 Elf_Ehdr *hdr;
1945 Elf_Shdr *sechdrs;
1946 char *secstrings, *args, *modmagic, *strtab = NULL;
1947 char *staging;
1948 unsigned int i;
1949 unsigned int symindex = 0;
1950 unsigned int strindex = 0;
1951 unsigned int modindex, versindex, infoindex, pcpuindex;
1952 struct module *mod;
1953 long err = 0;
1954 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1955 unsigned long symoffs, stroffs, *strmap;
1957 mm_segment_t old_fs;
1959 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1960 umod, len, uargs);
1961 if (len < sizeof(*hdr))
1962 return ERR_PTR(-ENOEXEC);
1964 /* Suck in entire file: we'll want most of it. */
1965 /* vmalloc barfs on "unusual" numbers. Check here */
1966 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1967 return ERR_PTR(-ENOMEM);
1969 if (copy_from_user(hdr, umod, len) != 0) {
1970 err = -EFAULT;
1971 goto free_hdr;
1974 /* Sanity checks against insmoding binaries or wrong arch,
1975 weird elf version */
1976 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1977 || hdr->e_type != ET_REL
1978 || !elf_check_arch(hdr)
1979 || hdr->e_shentsize != sizeof(*sechdrs)) {
1980 err = -ENOEXEC;
1981 goto free_hdr;
1984 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1985 goto truncated;
1987 /* Convenience variables */
1988 sechdrs = (void *)hdr + hdr->e_shoff;
1989 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1990 sechdrs[0].sh_addr = 0;
1992 for (i = 1; i < hdr->e_shnum; i++) {
1993 if (sechdrs[i].sh_type != SHT_NOBITS
1994 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1995 goto truncated;
1997 /* Mark all sections sh_addr with their address in the
1998 temporary image. */
1999 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2001 /* Internal symbols and strings. */
2002 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2003 symindex = i;
2004 strindex = sechdrs[i].sh_link;
2005 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2007 #ifndef CONFIG_MODULE_UNLOAD
2008 /* Don't load .exit sections */
2009 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2010 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2011 #endif
2014 modindex = find_sec(hdr, sechdrs, secstrings,
2015 ".gnu.linkonce.this_module");
2016 if (!modindex) {
2017 printk(KERN_WARNING "No module found in object\n");
2018 err = -ENOEXEC;
2019 goto free_hdr;
2021 /* This is temporary: point mod into copy of data. */
2022 mod = (void *)sechdrs[modindex].sh_addr;
2024 if (symindex == 0) {
2025 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2026 mod->name);
2027 err = -ENOEXEC;
2028 goto free_hdr;
2031 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2032 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2033 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2035 /* Don't keep modinfo and version sections. */
2036 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2037 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2039 /* Check module struct version now, before we try to use module. */
2040 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2041 err = -ENOEXEC;
2042 goto free_hdr;
2045 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2046 /* This is allowed: modprobe --force will invalidate it. */
2047 if (!modmagic) {
2048 err = try_to_force_load(mod, "bad vermagic");
2049 if (err)
2050 goto free_hdr;
2051 } else if (!same_magic(modmagic, vermagic, versindex)) {
2052 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2053 mod->name, modmagic, vermagic);
2054 err = -ENOEXEC;
2055 goto free_hdr;
2058 staging = get_modinfo(sechdrs, infoindex, "staging");
2059 if (staging) {
2060 add_taint_module(mod, TAINT_CRAP);
2061 printk(KERN_WARNING "%s: module is from the staging directory,"
2062 " the quality is unknown, you have been warned.\n",
2063 mod->name);
2066 /* Now copy in args */
2067 args = strndup_user(uargs, ~0UL >> 1);
2068 if (IS_ERR(args)) {
2069 err = PTR_ERR(args);
2070 goto free_hdr;
2073 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2074 * sizeof(long), GFP_KERNEL);
2075 if (!strmap) {
2076 err = -ENOMEM;
2077 goto free_mod;
2080 if (find_module(mod->name)) {
2081 err = -EEXIST;
2082 goto free_mod;
2085 mod->state = MODULE_STATE_COMING;
2087 /* Allow arches to frob section contents and sizes. */
2088 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2089 if (err < 0)
2090 goto free_mod;
2092 if (pcpuindex) {
2093 /* We have a special allocation for this section. */
2094 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2095 sechdrs[pcpuindex].sh_addralign,
2096 mod->name);
2097 if (!percpu) {
2098 err = -ENOMEM;
2099 goto free_mod;
2101 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2102 mod->percpu = percpu;
2105 /* Determine total sizes, and put offsets in sh_entsize. For now
2106 this is done generically; there doesn't appear to be any
2107 special cases for the architectures. */
2108 layout_sections(mod, hdr, sechdrs, secstrings);
2109 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2110 secstrings, &stroffs, strmap);
2112 /* Do the allocs. */
2113 ptr = module_alloc_update_bounds(mod->core_size);
2115 * The pointer to this block is stored in the module structure
2116 * which is inside the block. Just mark it as not being a
2117 * leak.
2119 kmemleak_not_leak(ptr);
2120 if (!ptr) {
2121 err = -ENOMEM;
2122 goto free_percpu;
2124 memset(ptr, 0, mod->core_size);
2125 mod->module_core = ptr;
2127 ptr = module_alloc_update_bounds(mod->init_size);
2129 * The pointer to this block is stored in the module structure
2130 * which is inside the block. This block doesn't need to be
2131 * scanned as it contains data and code that will be freed
2132 * after the module is initialized.
2134 kmemleak_ignore(ptr);
2135 if (!ptr && mod->init_size) {
2136 err = -ENOMEM;
2137 goto free_core;
2139 memset(ptr, 0, mod->init_size);
2140 mod->module_init = ptr;
2142 /* Transfer each section which specifies SHF_ALLOC */
2143 DEBUGP("final section addresses:\n");
2144 for (i = 0; i < hdr->e_shnum; i++) {
2145 void *dest;
2147 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2148 continue;
2150 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2151 dest = mod->module_init
2152 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2153 else
2154 dest = mod->module_core + sechdrs[i].sh_entsize;
2156 if (sechdrs[i].sh_type != SHT_NOBITS)
2157 memcpy(dest, (void *)sechdrs[i].sh_addr,
2158 sechdrs[i].sh_size);
2159 /* Update sh_addr to point to copy in image. */
2160 sechdrs[i].sh_addr = (unsigned long)dest;
2161 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2163 /* Module has been moved. */
2164 mod = (void *)sechdrs[modindex].sh_addr;
2165 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2167 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2168 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2169 mod->name);
2170 if (!mod->refptr) {
2171 err = -ENOMEM;
2172 goto free_init;
2174 #endif
2175 /* Now we've moved module, initialize linked lists, etc. */
2176 module_unload_init(mod);
2178 /* add kobject, so we can reference it. */
2179 err = mod_sysfs_init(mod);
2180 if (err)
2181 goto free_unload;
2183 /* Set up license info based on the info section */
2184 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2187 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2188 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2189 * using GPL-only symbols it needs.
2191 if (strcmp(mod->name, "ndiswrapper") == 0)
2192 add_taint(TAINT_PROPRIETARY_MODULE);
2194 /* driverloader was caught wrongly pretending to be under GPL */
2195 if (strcmp(mod->name, "driverloader") == 0)
2196 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2198 /* Set up MODINFO_ATTR fields */
2199 setup_modinfo(mod, sechdrs, infoindex);
2201 /* Fix up syms, so that st_value is a pointer to location. */
2202 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2203 mod);
2204 if (err < 0)
2205 goto cleanup;
2207 /* Now we've got everything in the final locations, we can
2208 * find optional sections. */
2209 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2210 sizeof(*mod->kp), &mod->num_kp);
2211 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2212 sizeof(*mod->syms), &mod->num_syms);
2213 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2214 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2215 sizeof(*mod->gpl_syms),
2216 &mod->num_gpl_syms);
2217 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2218 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2219 "__ksymtab_gpl_future",
2220 sizeof(*mod->gpl_future_syms),
2221 &mod->num_gpl_future_syms);
2222 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2223 "__kcrctab_gpl_future");
2225 #ifdef CONFIG_UNUSED_SYMBOLS
2226 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2227 "__ksymtab_unused",
2228 sizeof(*mod->unused_syms),
2229 &mod->num_unused_syms);
2230 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2231 "__kcrctab_unused");
2232 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2233 "__ksymtab_unused_gpl",
2234 sizeof(*mod->unused_gpl_syms),
2235 &mod->num_unused_gpl_syms);
2236 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2237 "__kcrctab_unused_gpl");
2238 #endif
2239 #ifdef CONFIG_CONSTRUCTORS
2240 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2241 sizeof(*mod->ctors), &mod->num_ctors);
2242 #endif
2244 #ifdef CONFIG_TRACEPOINTS
2245 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2246 "__tracepoints",
2247 sizeof(*mod->tracepoints),
2248 &mod->num_tracepoints);
2249 #endif
2250 #ifdef CONFIG_EVENT_TRACING
2251 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2252 "_ftrace_events",
2253 sizeof(*mod->trace_events),
2254 &mod->num_trace_events);
2256 * This section contains pointers to allocated objects in the trace
2257 * code and not scanning it leads to false positives.
2259 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2260 mod->num_trace_events, GFP_KERNEL);
2261 #endif
2262 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2263 /* sechdrs[0].sh_size is always zero */
2264 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2265 "__mcount_loc",
2266 sizeof(*mod->ftrace_callsites),
2267 &mod->num_ftrace_callsites);
2268 #endif
2269 #ifdef CONFIG_MODVERSIONS
2270 if ((mod->num_syms && !mod->crcs)
2271 || (mod->num_gpl_syms && !mod->gpl_crcs)
2272 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2273 #ifdef CONFIG_UNUSED_SYMBOLS
2274 || (mod->num_unused_syms && !mod->unused_crcs)
2275 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2276 #endif
2278 err = try_to_force_load(mod,
2279 "no versions for exported symbols");
2280 if (err)
2281 goto cleanup;
2283 #endif
2285 /* Now do relocations. */
2286 for (i = 1; i < hdr->e_shnum; i++) {
2287 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2288 unsigned int info = sechdrs[i].sh_info;
2290 /* Not a valid relocation section? */
2291 if (info >= hdr->e_shnum)
2292 continue;
2294 /* Don't bother with non-allocated sections */
2295 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2296 continue;
2298 if (sechdrs[i].sh_type == SHT_REL)
2299 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2300 else if (sechdrs[i].sh_type == SHT_RELA)
2301 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2302 mod);
2303 if (err < 0)
2304 goto cleanup;
2307 /* Find duplicate symbols */
2308 err = verify_export_symbols(mod);
2309 if (err < 0)
2310 goto cleanup;
2312 /* Set up and sort exception table */
2313 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2314 sizeof(*mod->extable), &mod->num_exentries);
2315 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2317 /* Finally, copy percpu area over. */
2318 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2319 sechdrs[pcpuindex].sh_size);
2321 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2322 symoffs, stroffs, secstrings, strmap);
2323 kfree(strmap);
2324 strmap = NULL;
2326 if (!mod->taints) {
2327 struct _ddebug *debug;
2328 unsigned int num_debug;
2330 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2331 sizeof(*debug), &num_debug);
2332 if (debug)
2333 dynamic_debug_setup(debug, num_debug);
2336 err = module_finalize(hdr, sechdrs, mod);
2337 if (err < 0)
2338 goto cleanup;
2340 /* flush the icache in correct context */
2341 old_fs = get_fs();
2342 set_fs(KERNEL_DS);
2345 * Flush the instruction cache, since we've played with text.
2346 * Do it before processing of module parameters, so the module
2347 * can provide parameter accessor functions of its own.
2349 if (mod->module_init)
2350 flush_icache_range((unsigned long)mod->module_init,
2351 (unsigned long)mod->module_init
2352 + mod->init_size);
2353 flush_icache_range((unsigned long)mod->module_core,
2354 (unsigned long)mod->module_core + mod->core_size);
2356 set_fs(old_fs);
2358 mod->args = args;
2359 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2360 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2361 mod->name);
2363 /* Now sew it into the lists so we can get lockdep and oops
2364 * info during argument parsing. Noone should access us, since
2365 * strong_try_module_get() will fail.
2366 * lockdep/oops can run asynchronous, so use the RCU list insertion
2367 * function to insert in a way safe to concurrent readers.
2368 * The mutex protects against concurrent writers.
2370 list_add_rcu(&mod->list, &modules);
2372 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2373 if (err < 0)
2374 goto unlink;
2376 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2377 if (err < 0)
2378 goto unlink;
2379 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2380 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2382 /* Get rid of temporary copy */
2383 vfree(hdr);
2385 trace_module_load(mod);
2387 /* Done! */
2388 return mod;
2390 unlink:
2391 /* Unlink carefully: kallsyms could be walking list. */
2392 list_del_rcu(&mod->list);
2393 synchronize_sched();
2394 module_arch_cleanup(mod);
2395 cleanup:
2396 free_modinfo(mod);
2397 kobject_del(&mod->mkobj.kobj);
2398 kobject_put(&mod->mkobj.kobj);
2399 free_unload:
2400 module_unload_free(mod);
2401 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2402 percpu_modfree(mod->refptr);
2403 free_init:
2404 #endif
2405 module_free(mod, mod->module_init);
2406 free_core:
2407 module_free(mod, mod->module_core);
2408 /* mod will be freed with core. Don't access it beyond this line! */
2409 free_percpu:
2410 if (percpu)
2411 percpu_modfree(percpu);
2412 free_mod:
2413 kfree(args);
2414 kfree(strmap);
2415 free_hdr:
2416 vfree(hdr);
2417 return ERR_PTR(err);
2419 truncated:
2420 printk(KERN_ERR "Module len %lu truncated\n", len);
2421 err = -ENOEXEC;
2422 goto free_hdr;
2425 /* Call module constructors. */
2426 static void do_mod_ctors(struct module *mod)
2428 #ifdef CONFIG_CONSTRUCTORS
2429 unsigned long i;
2431 for (i = 0; i < mod->num_ctors; i++)
2432 mod->ctors[i]();
2433 #endif
2436 /* This is where the real work happens */
2437 SYSCALL_DEFINE3(init_module, void __user *, umod,
2438 unsigned long, len, const char __user *, uargs)
2440 struct module *mod;
2441 int ret = 0;
2443 /* Must have permission */
2444 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2445 return -EPERM;
2447 /* Only one module load at a time, please */
2448 if (mutex_lock_interruptible(&module_mutex) != 0)
2449 return -EINTR;
2451 /* Do all the hard work */
2452 mod = load_module(umod, len, uargs);
2453 if (IS_ERR(mod)) {
2454 mutex_unlock(&module_mutex);
2455 return PTR_ERR(mod);
2458 /* Drop lock so they can recurse */
2459 mutex_unlock(&module_mutex);
2461 blocking_notifier_call_chain(&module_notify_list,
2462 MODULE_STATE_COMING, mod);
2464 do_mod_ctors(mod);
2465 /* Start the module */
2466 if (mod->init != NULL)
2467 ret = do_one_initcall(mod->init);
2468 if (ret < 0) {
2469 /* Init routine failed: abort. Try to protect us from
2470 buggy refcounters. */
2471 mod->state = MODULE_STATE_GOING;
2472 synchronize_sched();
2473 module_put(mod);
2474 blocking_notifier_call_chain(&module_notify_list,
2475 MODULE_STATE_GOING, mod);
2476 mutex_lock(&module_mutex);
2477 free_module(mod);
2478 mutex_unlock(&module_mutex);
2479 wake_up(&module_wq);
2480 return ret;
2482 if (ret > 0) {
2483 printk(KERN_WARNING
2484 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2485 "%s: loading module anyway...\n",
2486 __func__, mod->name, ret,
2487 __func__);
2488 dump_stack();
2491 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2492 mod->state = MODULE_STATE_LIVE;
2493 wake_up(&module_wq);
2494 blocking_notifier_call_chain(&module_notify_list,
2495 MODULE_STATE_LIVE, mod);
2497 /* We need to finish all async code before the module init sequence is done */
2498 async_synchronize_full();
2500 mutex_lock(&module_mutex);
2501 /* Drop initial reference. */
2502 module_put(mod);
2503 trim_init_extable(mod);
2504 #ifdef CONFIG_KALLSYMS
2505 mod->num_symtab = mod->core_num_syms;
2506 mod->symtab = mod->core_symtab;
2507 mod->strtab = mod->core_strtab;
2508 #endif
2509 module_free(mod, mod->module_init);
2510 mod->module_init = NULL;
2511 mod->init_size = 0;
2512 mod->init_text_size = 0;
2513 mutex_unlock(&module_mutex);
2515 return 0;
2518 static inline int within(unsigned long addr, void *start, unsigned long size)
2520 return ((void *)addr >= start && (void *)addr < start + size);
2523 #ifdef CONFIG_KALLSYMS
2525 * This ignores the intensely annoying "mapping symbols" found
2526 * in ARM ELF files: $a, $t and $d.
2528 static inline int is_arm_mapping_symbol(const char *str)
2530 return str[0] == '$' && strchr("atd", str[1])
2531 && (str[2] == '\0' || str[2] == '.');
2534 static const char *get_ksymbol(struct module *mod,
2535 unsigned long addr,
2536 unsigned long *size,
2537 unsigned long *offset)
2539 unsigned int i, best = 0;
2540 unsigned long nextval;
2542 /* At worse, next value is at end of module */
2543 if (within_module_init(addr, mod))
2544 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2545 else
2546 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2548 /* Scan for closest preceeding symbol, and next symbol. (ELF
2549 starts real symbols at 1). */
2550 for (i = 1; i < mod->num_symtab; i++) {
2551 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2552 continue;
2554 /* We ignore unnamed symbols: they're uninformative
2555 * and inserted at a whim. */
2556 if (mod->symtab[i].st_value <= addr
2557 && mod->symtab[i].st_value > mod->symtab[best].st_value
2558 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2559 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2560 best = i;
2561 if (mod->symtab[i].st_value > addr
2562 && mod->symtab[i].st_value < nextval
2563 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2564 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2565 nextval = mod->symtab[i].st_value;
2568 if (!best)
2569 return NULL;
2571 if (size)
2572 *size = nextval - mod->symtab[best].st_value;
2573 if (offset)
2574 *offset = addr - mod->symtab[best].st_value;
2575 return mod->strtab + mod->symtab[best].st_name;
2578 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2579 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2580 const char *module_address_lookup(unsigned long addr,
2581 unsigned long *size,
2582 unsigned long *offset,
2583 char **modname,
2584 char *namebuf)
2586 struct module *mod;
2587 const char *ret = NULL;
2589 preempt_disable();
2590 list_for_each_entry_rcu(mod, &modules, list) {
2591 if (within_module_init(addr, mod) ||
2592 within_module_core(addr, mod)) {
2593 if (modname)
2594 *modname = mod->name;
2595 ret = get_ksymbol(mod, addr, size, offset);
2596 break;
2599 /* Make a copy in here where it's safe */
2600 if (ret) {
2601 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2602 ret = namebuf;
2604 preempt_enable();
2605 return ret;
2608 int lookup_module_symbol_name(unsigned long addr, char *symname)
2610 struct module *mod;
2612 preempt_disable();
2613 list_for_each_entry_rcu(mod, &modules, list) {
2614 if (within_module_init(addr, mod) ||
2615 within_module_core(addr, mod)) {
2616 const char *sym;
2618 sym = get_ksymbol(mod, addr, NULL, NULL);
2619 if (!sym)
2620 goto out;
2621 strlcpy(symname, sym, KSYM_NAME_LEN);
2622 preempt_enable();
2623 return 0;
2626 out:
2627 preempt_enable();
2628 return -ERANGE;
2631 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2632 unsigned long *offset, char *modname, char *name)
2634 struct module *mod;
2636 preempt_disable();
2637 list_for_each_entry_rcu(mod, &modules, list) {
2638 if (within_module_init(addr, mod) ||
2639 within_module_core(addr, mod)) {
2640 const char *sym;
2642 sym = get_ksymbol(mod, addr, size, offset);
2643 if (!sym)
2644 goto out;
2645 if (modname)
2646 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2647 if (name)
2648 strlcpy(name, sym, KSYM_NAME_LEN);
2649 preempt_enable();
2650 return 0;
2653 out:
2654 preempt_enable();
2655 return -ERANGE;
2658 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2659 char *name, char *module_name, int *exported)
2661 struct module *mod;
2663 preempt_disable();
2664 list_for_each_entry_rcu(mod, &modules, list) {
2665 if (symnum < mod->num_symtab) {
2666 *value = mod->symtab[symnum].st_value;
2667 *type = mod->symtab[symnum].st_info;
2668 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2669 KSYM_NAME_LEN);
2670 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2671 *exported = is_exported(name, *value, mod);
2672 preempt_enable();
2673 return 0;
2675 symnum -= mod->num_symtab;
2677 preempt_enable();
2678 return -ERANGE;
2681 static unsigned long mod_find_symname(struct module *mod, const char *name)
2683 unsigned int i;
2685 for (i = 0; i < mod->num_symtab; i++)
2686 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2687 mod->symtab[i].st_info != 'U')
2688 return mod->symtab[i].st_value;
2689 return 0;
2692 /* Look for this name: can be of form module:name. */
2693 unsigned long module_kallsyms_lookup_name(const char *name)
2695 struct module *mod;
2696 char *colon;
2697 unsigned long ret = 0;
2699 /* Don't lock: we're in enough trouble already. */
2700 preempt_disable();
2701 if ((colon = strchr(name, ':')) != NULL) {
2702 *colon = '\0';
2703 if ((mod = find_module(name)) != NULL)
2704 ret = mod_find_symname(mod, colon+1);
2705 *colon = ':';
2706 } else {
2707 list_for_each_entry_rcu(mod, &modules, list)
2708 if ((ret = mod_find_symname(mod, name)) != 0)
2709 break;
2711 preempt_enable();
2712 return ret;
2715 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2716 struct module *, unsigned long),
2717 void *data)
2719 struct module *mod;
2720 unsigned int i;
2721 int ret;
2723 list_for_each_entry(mod, &modules, list) {
2724 for (i = 0; i < mod->num_symtab; i++) {
2725 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2726 mod, mod->symtab[i].st_value);
2727 if (ret != 0)
2728 return ret;
2731 return 0;
2733 #endif /* CONFIG_KALLSYMS */
2735 static char *module_flags(struct module *mod, char *buf)
2737 int bx = 0;
2739 if (mod->taints ||
2740 mod->state == MODULE_STATE_GOING ||
2741 mod->state == MODULE_STATE_COMING) {
2742 buf[bx++] = '(';
2743 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2744 buf[bx++] = 'P';
2745 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2746 buf[bx++] = 'F';
2747 if (mod->taints & (1 << TAINT_CRAP))
2748 buf[bx++] = 'C';
2750 * TAINT_FORCED_RMMOD: could be added.
2751 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2752 * apply to modules.
2755 /* Show a - for module-is-being-unloaded */
2756 if (mod->state == MODULE_STATE_GOING)
2757 buf[bx++] = '-';
2758 /* Show a + for module-is-being-loaded */
2759 if (mod->state == MODULE_STATE_COMING)
2760 buf[bx++] = '+';
2761 buf[bx++] = ')';
2763 buf[bx] = '\0';
2765 return buf;
2768 #ifdef CONFIG_PROC_FS
2769 /* Called by the /proc file system to return a list of modules. */
2770 static void *m_start(struct seq_file *m, loff_t *pos)
2772 mutex_lock(&module_mutex);
2773 return seq_list_start(&modules, *pos);
2776 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2778 return seq_list_next(p, &modules, pos);
2781 static void m_stop(struct seq_file *m, void *p)
2783 mutex_unlock(&module_mutex);
2786 static int m_show(struct seq_file *m, void *p)
2788 struct module *mod = list_entry(p, struct module, list);
2789 char buf[8];
2791 seq_printf(m, "%s %u",
2792 mod->name, mod->init_size + mod->core_size);
2793 print_unload_info(m, mod);
2795 /* Informative for users. */
2796 seq_printf(m, " %s",
2797 mod->state == MODULE_STATE_GOING ? "Unloading":
2798 mod->state == MODULE_STATE_COMING ? "Loading":
2799 "Live");
2800 /* Used by oprofile and other similar tools. */
2801 seq_printf(m, " 0x%p", mod->module_core);
2803 /* Taints info */
2804 if (mod->taints)
2805 seq_printf(m, " %s", module_flags(mod, buf));
2807 seq_printf(m, "\n");
2808 return 0;
2811 /* Format: modulename size refcount deps address
2813 Where refcount is a number or -, and deps is a comma-separated list
2814 of depends or -.
2816 static const struct seq_operations modules_op = {
2817 .start = m_start,
2818 .next = m_next,
2819 .stop = m_stop,
2820 .show = m_show
2823 static int modules_open(struct inode *inode, struct file *file)
2825 return seq_open(file, &modules_op);
2828 static const struct file_operations proc_modules_operations = {
2829 .open = modules_open,
2830 .read = seq_read,
2831 .llseek = seq_lseek,
2832 .release = seq_release,
2835 static int __init proc_modules_init(void)
2837 proc_create("modules", 0, NULL, &proc_modules_operations);
2838 return 0;
2840 module_init(proc_modules_init);
2841 #endif
2843 /* Given an address, look for it in the module exception tables. */
2844 const struct exception_table_entry *search_module_extables(unsigned long addr)
2846 const struct exception_table_entry *e = NULL;
2847 struct module *mod;
2849 preempt_disable();
2850 list_for_each_entry_rcu(mod, &modules, list) {
2851 if (mod->num_exentries == 0)
2852 continue;
2854 e = search_extable(mod->extable,
2855 mod->extable + mod->num_exentries - 1,
2856 addr);
2857 if (e)
2858 break;
2860 preempt_enable();
2862 /* Now, if we found one, we are running inside it now, hence
2863 we cannot unload the module, hence no refcnt needed. */
2864 return e;
2868 * is_module_address - is this address inside a module?
2869 * @addr: the address to check.
2871 * See is_module_text_address() if you simply want to see if the address
2872 * is code (not data).
2874 bool is_module_address(unsigned long addr)
2876 bool ret;
2878 preempt_disable();
2879 ret = __module_address(addr) != NULL;
2880 preempt_enable();
2882 return ret;
2886 * __module_address - get the module which contains an address.
2887 * @addr: the address.
2889 * Must be called with preempt disabled or module mutex held so that
2890 * module doesn't get freed during this.
2892 struct module *__module_address(unsigned long addr)
2894 struct module *mod;
2896 if (addr < module_addr_min || addr > module_addr_max)
2897 return NULL;
2899 list_for_each_entry_rcu(mod, &modules, list)
2900 if (within_module_core(addr, mod)
2901 || within_module_init(addr, mod))
2902 return mod;
2903 return NULL;
2905 EXPORT_SYMBOL_GPL(__module_address);
2908 * is_module_text_address - is this address inside module code?
2909 * @addr: the address to check.
2911 * See is_module_address() if you simply want to see if the address is
2912 * anywhere in a module. See kernel_text_address() for testing if an
2913 * address corresponds to kernel or module code.
2915 bool is_module_text_address(unsigned long addr)
2917 bool ret;
2919 preempt_disable();
2920 ret = __module_text_address(addr) != NULL;
2921 preempt_enable();
2923 return ret;
2927 * __module_text_address - get the module whose code contains an address.
2928 * @addr: the address.
2930 * Must be called with preempt disabled or module mutex held so that
2931 * module doesn't get freed during this.
2933 struct module *__module_text_address(unsigned long addr)
2935 struct module *mod = __module_address(addr);
2936 if (mod) {
2937 /* Make sure it's within the text section. */
2938 if (!within(addr, mod->module_init, mod->init_text_size)
2939 && !within(addr, mod->module_core, mod->core_text_size))
2940 mod = NULL;
2942 return mod;
2944 EXPORT_SYMBOL_GPL(__module_text_address);
2946 /* Don't grab lock, we're oopsing. */
2947 void print_modules(void)
2949 struct module *mod;
2950 char buf[8];
2952 printk(KERN_DEFAULT "Modules linked in:");
2953 /* Most callers should already have preempt disabled, but make sure */
2954 preempt_disable();
2955 list_for_each_entry_rcu(mod, &modules, list)
2956 printk(" %s%s", mod->name, module_flags(mod, buf));
2957 preempt_enable();
2958 if (last_unloaded_module[0])
2959 printk(" [last unloaded: %s]", last_unloaded_module);
2960 printk("\n");
2963 #ifdef CONFIG_MODVERSIONS
2964 /* Generate the signature for all relevant module structures here.
2965 * If these change, we don't want to try to parse the module. */
2966 void module_layout(struct module *mod,
2967 struct modversion_info *ver,
2968 struct kernel_param *kp,
2969 struct kernel_symbol *ks,
2970 struct tracepoint *tp)
2973 EXPORT_SYMBOL(module_layout);
2974 #endif
2976 #ifdef CONFIG_TRACEPOINTS
2977 void module_update_tracepoints(void)
2979 struct module *mod;
2981 mutex_lock(&module_mutex);
2982 list_for_each_entry(mod, &modules, list)
2983 if (!mod->taints)
2984 tracepoint_update_probe_range(mod->tracepoints,
2985 mod->tracepoints + mod->num_tracepoints);
2986 mutex_unlock(&module_mutex);
2990 * Returns 0 if current not found.
2991 * Returns 1 if current found.
2993 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2995 struct module *iter_mod;
2996 int found = 0;
2998 mutex_lock(&module_mutex);
2999 list_for_each_entry(iter_mod, &modules, list) {
3000 if (!iter_mod->taints) {
3002 * Sorted module list
3004 if (iter_mod < iter->module)
3005 continue;
3006 else if (iter_mod > iter->module)
3007 iter->tracepoint = NULL;
3008 found = tracepoint_get_iter_range(&iter->tracepoint,
3009 iter_mod->tracepoints,
3010 iter_mod->tracepoints
3011 + iter_mod->num_tracepoints);
3012 if (found) {
3013 iter->module = iter_mod;
3014 break;
3018 mutex_unlock(&module_mutex);
3019 return found;
3021 #endif