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>
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/unwind.h>
48 #include <linux/rculist.h>
49 #include <asm/uaccess.h>
50 #include <asm/cacheflush.h>
51 #include <asm/mmu_context.h>
52 #include <linux/license.h>
53 #include <asm/sections.h>
54 #include <linux/tracepoint.h>
55 #include <linux/ftrace.h>
56 #include <linux/async.h>
57 #include <linux/percpu.h>
58 #include <linux/kmemleak.h>
60 #define CREATE_TRACE_POINTS
61 #include <trace/events/module.h>
63 EXPORT_TRACEPOINT_SYMBOL(module_get);
68 #define DEBUGP(fmt , a...)
71 #ifndef ARCH_SHF_SMALL
72 #define ARCH_SHF_SMALL 0
75 /* If this is set, the section belongs in the init part of the module */
76 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
78 #ifdef CONFIG_ENTERPRISE_SUPPORT
79 /* Allow unsupported modules switch. */
80 #ifdef UNSUPPORTED_MODULES
81 int unsupported = UNSUPPORTED_MODULES;
83 int unsupported = 2; /* don't warn when loading unsupported modules. */
86 static int __init unsupported_setup(char *str)
88 get_option(&str, &unsupported);
91 __setup("unsupported=", unsupported_setup);
94 /* List of modules, protected by module_mutex or preempt_disable
95 * (delete uses stop_machine/add uses RCU list operations). */
96 DEFINE_MUTEX(module_mutex);
97 EXPORT_SYMBOL_GPL(module_mutex);
98 static LIST_HEAD(modules);
100 /* Block module loading/unloading? */
101 int modules_disabled = 0;
103 /* Waiting for a module to finish initializing? */
104 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
106 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
108 /* Bounds of module allocation, for speeding __module_address */
109 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
111 int register_module_notifier(struct notifier_block * nb)
113 return blocking_notifier_chain_register(&module_notify_list, nb);
115 EXPORT_SYMBOL(register_module_notifier);
117 int unregister_module_notifier(struct notifier_block * nb)
119 return blocking_notifier_chain_unregister(&module_notify_list, nb);
121 EXPORT_SYMBOL(unregister_module_notifier);
123 /* We require a truly strong try_module_get(): 0 means failure due to
124 ongoing or failed initialization etc. */
125 static inline int strong_try_module_get(struct module *mod)
127 if (mod && mod->state == MODULE_STATE_COMING)
129 if (try_module_get(mod))
135 static inline void add_taint_module(struct module *mod, unsigned flag)
138 mod->taints |= (1U << flag);
142 * A thread that wants to hold a reference to a module only while it
143 * is running can call this to safely exit. nfsd and lockd use this.
145 void __module_put_and_exit(struct module *mod, long code)
150 EXPORT_SYMBOL(__module_put_and_exit);
152 /* Find a module section: 0 means not found. */
153 static unsigned int find_sec(Elf_Ehdr *hdr,
155 const char *secstrings,
160 for (i = 1; i < hdr->e_shnum; i++)
161 /* Alloc bit cleared means "ignore it." */
162 if ((sechdrs[i].sh_flags & SHF_ALLOC)
163 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
168 /* Find a module section, or NULL. */
169 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
170 const char *secstrings, const char *name)
172 /* Section 0 has sh_addr 0. */
173 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
176 /* Find a module section, or NULL. Fill in number of "objects" in section. */
177 static void *section_objs(Elf_Ehdr *hdr,
179 const char *secstrings,
184 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
186 /* Section 0 has sh_addr 0 and sh_size 0. */
187 *num = sechdrs[sec].sh_size / object_size;
188 return (void *)sechdrs[sec].sh_addr;
191 /* Provided by the linker */
192 extern const struct kernel_symbol __start___ksymtab[];
193 extern const struct kernel_symbol __stop___ksymtab[];
194 extern const struct kernel_symbol __start___ksymtab_gpl[];
195 extern const struct kernel_symbol __stop___ksymtab_gpl[];
196 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
197 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
198 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
199 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
200 extern const unsigned long __start___kcrctab[];
201 extern const unsigned long __start___kcrctab_gpl[];
202 extern const unsigned long __start___kcrctab_gpl_future[];
203 #ifdef CONFIG_UNUSED_SYMBOLS
204 extern const struct kernel_symbol __start___ksymtab_unused[];
205 extern const struct kernel_symbol __stop___ksymtab_unused[];
206 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
207 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
208 extern const unsigned long __start___kcrctab_unused[];
209 extern const unsigned long __start___kcrctab_unused_gpl[];
212 #ifndef CONFIG_MODVERSIONS
213 #define symversion(base, idx) NULL
215 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
218 static bool each_symbol_in_section(const struct symsearch *arr,
219 unsigned int arrsize,
220 struct module *owner,
221 bool (*fn)(const struct symsearch *syms,
222 struct module *owner,
223 unsigned int symnum, void *data),
228 for (j = 0; j < arrsize; j++) {
229 for (i = 0; i < arr[j].stop - arr[j].start; i++)
230 if (fn(&arr[j], owner, i, data))
237 /* Returns true as soon as fn returns true, otherwise false. */
238 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
239 unsigned int symnum, void *data), void *data)
242 const struct symsearch arr[] = {
243 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
244 NOT_GPL_ONLY, false },
245 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
246 __start___kcrctab_gpl,
248 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
249 __start___kcrctab_gpl_future,
250 WILL_BE_GPL_ONLY, false },
251 #ifdef CONFIG_UNUSED_SYMBOLS
252 { __start___ksymtab_unused, __stop___ksymtab_unused,
253 __start___kcrctab_unused,
254 NOT_GPL_ONLY, true },
255 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
256 __start___kcrctab_unused_gpl,
261 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
264 list_for_each_entry_rcu(mod, &modules, list) {
265 struct symsearch arr[] = {
266 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
267 NOT_GPL_ONLY, false },
268 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
271 { mod->gpl_future_syms,
272 mod->gpl_future_syms + mod->num_gpl_future_syms,
273 mod->gpl_future_crcs,
274 WILL_BE_GPL_ONLY, false },
275 #ifdef CONFIG_UNUSED_SYMBOLS
277 mod->unused_syms + mod->num_unused_syms,
279 NOT_GPL_ONLY, true },
280 { mod->unused_gpl_syms,
281 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
282 mod->unused_gpl_crcs,
287 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
292 EXPORT_SYMBOL_GPL(each_symbol);
294 struct find_symbol_arg {
301 struct module *owner;
302 const unsigned long *crc;
303 const struct kernel_symbol *sym;
306 static bool find_symbol_in_section(const struct symsearch *syms,
307 struct module *owner,
308 unsigned int symnum, void *data)
310 struct find_symbol_arg *fsa = data;
312 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
316 if (syms->licence == GPL_ONLY)
318 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
319 printk(KERN_WARNING "Symbol %s is being used "
320 "by a non-GPL module, which will not "
321 "be allowed in the future\n", fsa->name);
322 printk(KERN_WARNING "Please see the file "
323 "Documentation/feature-removal-schedule.txt "
324 "in the kernel source tree for more details.\n");
328 #ifdef CONFIG_UNUSED_SYMBOLS
329 if (syms->unused && fsa->warn) {
330 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
331 "however this module is using it.\n", fsa->name);
333 "This symbol will go away in the future.\n");
335 "Please evalute if this is the right api to use and if "
336 "it really is, submit a report the linux kernel "
337 "mailinglist together with submitting your code for "
343 fsa->crc = symversion(syms->crcs, symnum);
344 fsa->sym = &syms->start[symnum];
348 /* Find a symbol and return it, along with, (optional) crc and
349 * (optional) module which owns it */
350 const struct kernel_symbol *find_symbol(const char *name,
351 struct module **owner,
352 const unsigned long **crc,
356 struct find_symbol_arg fsa;
362 if (each_symbol(find_symbol_in_section, &fsa)) {
370 DEBUGP("Failed to find symbol %s\n", name);
373 EXPORT_SYMBOL_GPL(find_symbol);
375 /* Search for module by name: must hold module_mutex. */
376 struct module *find_module(const char *name)
380 list_for_each_entry(mod, &modules, list) {
381 if (strcmp(mod->name, name) == 0)
386 EXPORT_SYMBOL_GPL(find_module);
390 static void *percpu_modalloc(unsigned long size, unsigned long align,
395 if (align > PAGE_SIZE) {
396 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
397 name, align, PAGE_SIZE);
401 ptr = __alloc_reserved_percpu(size, align);
404 "Could not allocate %lu bytes percpu data\n", size);
408 static void percpu_modfree(void *freeme)
413 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
415 const char *secstrings)
417 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
420 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
424 for_each_possible_cpu(cpu)
425 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
428 #else /* ... !CONFIG_SMP */
430 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
435 static inline void percpu_modfree(void *pcpuptr)
439 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
441 const char *secstrings)
445 static inline void percpu_modcopy(void *pcpudst, const void *src,
448 /* pcpusec should be 0, and size of that section should be 0. */
452 #endif /* CONFIG_SMP */
454 #define MODINFO_ATTR(field) \
455 static void setup_modinfo_##field(struct module *mod, const char *s) \
457 mod->field = kstrdup(s, GFP_KERNEL); \
459 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
460 struct module *mod, char *buffer) \
462 return sprintf(buffer, "%s\n", mod->field); \
464 static int modinfo_##field##_exists(struct module *mod) \
466 return mod->field != NULL; \
468 static void free_modinfo_##field(struct module *mod) \
473 static struct module_attribute modinfo_##field = { \
474 .attr = { .name = __stringify(field), .mode = 0444 }, \
475 .show = show_modinfo_##field, \
476 .setup = setup_modinfo_##field, \
477 .test = modinfo_##field##_exists, \
478 .free = free_modinfo_##field, \
481 MODINFO_ATTR(version);
482 MODINFO_ATTR(srcversion);
484 static char last_unloaded_module[MODULE_NAME_LEN+1];
486 #ifdef CONFIG_MODULE_UNLOAD
487 /* Init the unload section of the module. */
488 static void module_unload_init(struct module *mod)
492 INIT_LIST_HEAD(&mod->modules_which_use_me);
493 for_each_possible_cpu(cpu)
494 local_set(__module_ref_addr(mod, cpu), 0);
495 /* Hold reference count during initialization. */
496 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
497 /* Backwards compatibility macros put refcount during init. */
498 mod->waiter = current;
501 /* modules using other modules */
504 struct list_head list;
505 struct module *module_which_uses;
508 /* Does a already use b? */
509 static int already_uses(struct module *a, struct module *b)
511 struct module_use *use;
513 list_for_each_entry(use, &b->modules_which_use_me, list) {
514 if (use->module_which_uses == a) {
515 DEBUGP("%s uses %s!\n", a->name, b->name);
519 DEBUGP("%s does not use %s!\n", a->name, b->name);
523 /* Module a uses b */
524 int use_module(struct module *a, struct module *b)
526 struct module_use *use;
529 if (b == NULL || already_uses(a, b)) return 1;
531 /* If we're interrupted or time out, we fail. */
532 if (wait_event_interruptible_timeout(
533 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
535 printk("%s: gave up waiting for init of module %s.\n",
540 /* If strong_try_module_get() returned a different error, we fail. */
544 DEBUGP("Allocating new usage for %s.\n", a->name);
545 use = kmalloc(sizeof(*use), GFP_ATOMIC);
547 printk("%s: out of memory loading\n", a->name);
552 use->module_which_uses = a;
553 list_add(&use->list, &b->modules_which_use_me);
554 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
557 EXPORT_SYMBOL_GPL(use_module);
559 /* Clear the unload stuff of the module. */
560 static void module_unload_free(struct module *mod)
564 list_for_each_entry(i, &modules, list) {
565 struct module_use *use;
567 list_for_each_entry(use, &i->modules_which_use_me, list) {
568 if (use->module_which_uses == mod) {
569 DEBUGP("%s unusing %s\n", mod->name, i->name);
571 list_del(&use->list);
573 sysfs_remove_link(i->holders_dir, mod->name);
574 /* There can be at most one match. */
581 #ifdef CONFIG_MODULE_FORCE_UNLOAD
582 static inline int try_force_unload(unsigned int flags)
584 int ret = (flags & O_TRUNC);
586 add_taint(TAINT_FORCED_RMMOD);
590 static inline int try_force_unload(unsigned int flags)
594 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
603 /* Whole machine is stopped with interrupts off when this runs. */
604 static int __try_stop_module(void *_sref)
606 struct stopref *sref = _sref;
608 /* If it's not unused, quit unless we're forcing. */
609 if (module_refcount(sref->mod) != 0) {
610 if (!(*sref->forced = try_force_unload(sref->flags)))
614 /* Mark it as dying. */
615 sref->mod->state = MODULE_STATE_GOING;
619 static int try_stop_module(struct module *mod, int flags, int *forced)
621 if (flags & O_NONBLOCK) {
622 struct stopref sref = { mod, flags, forced };
624 return stop_machine(__try_stop_module, &sref, NULL);
626 /* We don't need to stop the machine for this. */
627 mod->state = MODULE_STATE_GOING;
633 unsigned int module_refcount(struct module *mod)
635 unsigned int total = 0;
638 for_each_possible_cpu(cpu)
639 total += local_read(__module_ref_addr(mod, cpu));
642 EXPORT_SYMBOL(module_refcount);
644 /* This exists whether we can unload or not */
645 static void free_module(struct module *mod);
647 static void wait_for_zero_refcount(struct module *mod)
649 /* Since we might sleep for some time, release the mutex first */
650 mutex_unlock(&module_mutex);
652 DEBUGP("Looking at refcount...\n");
653 set_current_state(TASK_UNINTERRUPTIBLE);
654 if (module_refcount(mod) == 0)
658 current->state = TASK_RUNNING;
659 mutex_lock(&module_mutex);
662 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
666 char name[MODULE_NAME_LEN];
669 if (!capable(CAP_SYS_MODULE) || modules_disabled)
672 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
674 name[MODULE_NAME_LEN-1] = '\0';
676 /* Create stop_machine threads since free_module relies on
677 * a non-failing stop_machine call. */
678 ret = stop_machine_create();
682 if (mutex_lock_interruptible(&module_mutex) != 0) {
687 mod = find_module(name);
693 if (!list_empty(&mod->modules_which_use_me)) {
694 /* Other modules depend on us: get rid of them first. */
699 /* Doing init or already dying? */
700 if (mod->state != MODULE_STATE_LIVE) {
701 /* FIXME: if (force), slam module count and wake up
703 DEBUGP("%s already dying\n", mod->name);
708 /* If it has an init func, it must have an exit func to unload */
709 if (mod->init && !mod->exit) {
710 forced = try_force_unload(flags);
712 /* This module can't be removed */
718 /* Set this up before setting mod->state */
719 mod->waiter = current;
721 /* Stop the machine so refcounts can't move and disable module. */
722 ret = try_stop_module(mod, flags, &forced);
726 /* Never wait if forced. */
727 if (!forced && module_refcount(mod) != 0)
728 wait_for_zero_refcount(mod);
730 mutex_unlock(&module_mutex);
731 /* Final destruction now noone is using it. */
732 if (mod->exit != NULL)
734 blocking_notifier_call_chain(&module_notify_list,
735 MODULE_STATE_GOING, mod);
736 async_synchronize_full();
737 mutex_lock(&module_mutex);
738 /* Store the name of the last unloaded module for diagnostic purposes */
739 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
740 ddebug_remove_module(mod->name);
744 mutex_unlock(&module_mutex);
746 stop_machine_destroy();
750 static inline void print_unload_info(struct seq_file *m, struct module *mod)
752 struct module_use *use;
753 int printed_something = 0;
755 seq_printf(m, " %u ", module_refcount(mod));
757 /* Always include a trailing , so userspace can differentiate
758 between this and the old multi-field proc format. */
759 list_for_each_entry(use, &mod->modules_which_use_me, list) {
760 printed_something = 1;
761 seq_printf(m, "%s,", use->module_which_uses->name);
764 if (mod->init != NULL && mod->exit == NULL) {
765 printed_something = 1;
766 seq_printf(m, "[permanent],");
769 if (!printed_something)
773 void __symbol_put(const char *symbol)
775 struct module *owner;
778 if (!find_symbol(symbol, &owner, NULL, true, false))
783 EXPORT_SYMBOL(__symbol_put);
785 /* Note this assumes addr is a function, which it currently always is. */
786 void symbol_put_addr(void *addr)
788 struct module *modaddr;
789 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
791 if (core_kernel_text(a))
794 /* module_text_address is safe here: we're supposed to have reference
795 * to module from symbol_get, so it can't go away. */
796 modaddr = __module_text_address(a);
800 EXPORT_SYMBOL_GPL(symbol_put_addr);
802 static ssize_t show_refcnt(struct module_attribute *mattr,
803 struct module *mod, char *buffer)
805 return sprintf(buffer, "%u\n", module_refcount(mod));
808 static struct module_attribute refcnt = {
809 .attr = { .name = "refcnt", .mode = 0444 },
813 void module_put(struct module *module)
816 unsigned int cpu = get_cpu();
817 local_dec(__module_ref_addr(module, cpu));
818 trace_module_put(module, _RET_IP_,
819 local_read(__module_ref_addr(module, cpu)));
820 /* Maybe they're waiting for us to drop reference? */
821 if (unlikely(!module_is_live(module)))
822 wake_up_process(module->waiter);
826 EXPORT_SYMBOL(module_put);
828 #else /* !CONFIG_MODULE_UNLOAD */
829 static inline void print_unload_info(struct seq_file *m, struct module *mod)
831 /* We don't know the usage count, or what modules are using. */
832 seq_printf(m, " - -");
835 static inline void module_unload_free(struct module *mod)
839 int use_module(struct module *a, struct module *b)
841 return strong_try_module_get(b) == 0;
843 EXPORT_SYMBOL_GPL(use_module);
845 static inline void module_unload_init(struct module *mod)
848 #endif /* CONFIG_MODULE_UNLOAD */
850 static ssize_t show_initstate(struct module_attribute *mattr,
851 struct module *mod, char *buffer)
853 const char *state = "unknown";
855 switch (mod->state) {
856 case MODULE_STATE_LIVE:
859 case MODULE_STATE_COMING:
862 case MODULE_STATE_GOING:
866 return sprintf(buffer, "%s\n", state);
869 static struct module_attribute initstate = {
870 .attr = { .name = "initstate", .mode = 0444 },
871 .show = show_initstate,
874 #ifdef CONFIG_ENTERPRISE_SUPPORT
875 static void setup_modinfo_supported(struct module *mod, const char *s)
878 mod->taints |= (1 << TAINT_NO_SUPPORT);
882 if (strcmp(s, "external") == 0)
883 mod->taints |= (1 << TAINT_EXTERNAL_SUPPORT);
884 else if (strcmp(s, "yes"))
885 mod->taints |= (1 << TAINT_NO_SUPPORT);
888 static ssize_t show_modinfo_supported(struct module_attribute *mattr,
889 struct module *mod, char *buffer)
891 return sprintf(buffer, "%s\n", supported_printable(mod->taints));
894 static struct module_attribute modinfo_supported = {
895 .attr = { .name = "supported", .mode = 0444 },
896 .show = show_modinfo_supported,
897 .setup = setup_modinfo_supported,
901 static struct module_attribute *modinfo_attrs[] = {
905 #ifdef CONFIG_ENTERPRISE_SUPPORT
908 #ifdef CONFIG_MODULE_UNLOAD
914 static const char vermagic[] = VERMAGIC_STRING;
916 static int try_to_force_load(struct module *mod, const char *reason)
918 #ifdef CONFIG_MODULE_FORCE_LOAD
919 if (!test_taint(TAINT_FORCED_MODULE))
920 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
922 add_taint_module(mod, TAINT_FORCED_MODULE);
929 #ifdef CONFIG_MODVERSIONS
930 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
931 static unsigned long maybe_relocated(unsigned long crc,
932 const struct module *crc_owner)
934 #ifdef ARCH_RELOCATES_KCRCTAB
935 if (crc_owner == NULL)
936 return crc - (unsigned long)reloc_start;
941 static int check_version(Elf_Shdr *sechdrs,
942 unsigned int versindex,
945 const unsigned long *crc,
946 const struct module *crc_owner)
948 unsigned int i, num_versions;
949 struct modversion_info *versions;
951 /* Exporting module didn't supply crcs? OK, we're already tainted. */
955 /* No versions at all? modprobe --force does this. */
957 return try_to_force_load(mod, symname) == 0;
959 versions = (void *) sechdrs[versindex].sh_addr;
960 num_versions = sechdrs[versindex].sh_size
961 / sizeof(struct modversion_info);
963 for (i = 0; i < num_versions; i++) {
964 if (strcmp(versions[i].name, symname) != 0)
967 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
969 DEBUGP("Found checksum %lX vs module %lX\n",
970 maybe_relocated(*crc, crc_owner), versions[i].crc);
974 printk(KERN_WARNING "%s: no symbol version for %s\n",
979 printk("%s: disagrees about version of symbol %s\n",
984 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
985 unsigned int versindex,
988 const unsigned long *crc;
990 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
993 return check_version(sechdrs, versindex, "module_layout", mod, crc,
997 /* First part is kernel version, which we ignore if module has crcs. */
998 static inline int same_magic(const char *amagic, const char *bmagic,
1002 amagic += strcspn(amagic, " ");
1003 bmagic += strcspn(bmagic, " ");
1005 return strcmp(amagic, bmagic) == 0;
1008 static inline int check_version(Elf_Shdr *sechdrs,
1009 unsigned int versindex,
1010 const char *symname,
1012 const unsigned long *crc,
1013 const struct module *crc_owner)
1018 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1019 unsigned int versindex,
1025 static inline int same_magic(const char *amagic, const char *bmagic,
1028 return strcmp(amagic, bmagic) == 0;
1030 #endif /* CONFIG_MODVERSIONS */
1032 /* Resolve a symbol for this module. I.e. if we find one, record usage.
1033 Must be holding module_mutex. */
1034 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1035 unsigned int versindex,
1039 struct module *owner;
1040 const struct kernel_symbol *sym;
1041 const unsigned long *crc;
1043 sym = find_symbol(name, &owner, &crc,
1044 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1045 /* use_module can fail due to OOM,
1046 or module initialization or unloading */
1048 if (!check_version(sechdrs, versindex, name, mod, crc, owner)
1049 || !use_module(mod, owner))
1056 * /sys/module/foo/sections stuff
1057 * J. Corbet <corbet@lwn.net>
1059 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
1061 static inline bool sect_empty(const Elf_Shdr *sect)
1063 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1066 struct module_sect_attr
1068 struct module_attribute mattr;
1070 unsigned long address;
1073 struct module_sect_attrs
1075 struct attribute_group grp;
1076 unsigned int nsections;
1077 struct module_sect_attr attrs[0];
1080 static ssize_t module_sect_show(struct module_attribute *mattr,
1081 struct module *mod, char *buf)
1083 struct module_sect_attr *sattr =
1084 container_of(mattr, struct module_sect_attr, mattr);
1085 return sprintf(buf, "0x%lx\n", sattr->address);
1088 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1090 unsigned int section;
1092 for (section = 0; section < sect_attrs->nsections; section++)
1093 kfree(sect_attrs->attrs[section].name);
1097 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1098 char *secstrings, Elf_Shdr *sechdrs)
1100 unsigned int nloaded = 0, i, size[2];
1101 struct module_sect_attrs *sect_attrs;
1102 struct module_sect_attr *sattr;
1103 struct attribute **gattr;
1105 /* Count loaded sections and allocate structures */
1106 for (i = 0; i < nsect; i++)
1107 if (!sect_empty(&sechdrs[i]))
1109 size[0] = ALIGN(sizeof(*sect_attrs)
1110 + nloaded * sizeof(sect_attrs->attrs[0]),
1111 sizeof(sect_attrs->grp.attrs[0]));
1112 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1113 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1114 if (sect_attrs == NULL)
1117 /* Setup section attributes. */
1118 sect_attrs->grp.name = "sections";
1119 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1121 sect_attrs->nsections = 0;
1122 sattr = §_attrs->attrs[0];
1123 gattr = §_attrs->grp.attrs[0];
1124 for (i = 0; i < nsect; i++) {
1125 if (sect_empty(&sechdrs[i]))
1127 sattr->address = sechdrs[i].sh_addr;
1128 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1130 if (sattr->name == NULL)
1132 sect_attrs->nsections++;
1133 sattr->mattr.show = module_sect_show;
1134 sattr->mattr.store = NULL;
1135 sattr->mattr.attr.name = sattr->name;
1136 sattr->mattr.attr.mode = S_IRUGO;
1137 *(gattr++) = &(sattr++)->mattr.attr;
1141 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1144 mod->sect_attrs = sect_attrs;
1147 free_sect_attrs(sect_attrs);
1150 static void remove_sect_attrs(struct module *mod)
1152 if (mod->sect_attrs) {
1153 sysfs_remove_group(&mod->mkobj.kobj,
1154 &mod->sect_attrs->grp);
1155 /* We are positive that no one is using any sect attrs
1156 * at this point. Deallocate immediately. */
1157 free_sect_attrs(mod->sect_attrs);
1158 mod->sect_attrs = NULL;
1163 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1166 struct module_notes_attrs {
1167 struct kobject *dir;
1169 struct bin_attribute attrs[0];
1172 static ssize_t module_notes_read(struct kobject *kobj,
1173 struct bin_attribute *bin_attr,
1174 char *buf, loff_t pos, size_t count)
1177 * The caller checked the pos and count against our size.
1179 memcpy(buf, bin_attr->private + pos, count);
1183 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1186 if (notes_attrs->dir) {
1188 sysfs_remove_bin_file(notes_attrs->dir,
1189 ¬es_attrs->attrs[i]);
1190 kobject_put(notes_attrs->dir);
1195 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1196 char *secstrings, Elf_Shdr *sechdrs)
1198 unsigned int notes, loaded, i;
1199 struct module_notes_attrs *notes_attrs;
1200 struct bin_attribute *nattr;
1202 /* failed to create section attributes, so can't create notes */
1203 if (!mod->sect_attrs)
1206 /* Count notes sections and allocate structures. */
1208 for (i = 0; i < nsect; i++)
1209 if (!sect_empty(&sechdrs[i]) &&
1210 (sechdrs[i].sh_type == SHT_NOTE))
1216 notes_attrs = kzalloc(sizeof(*notes_attrs)
1217 + notes * sizeof(notes_attrs->attrs[0]),
1219 if (notes_attrs == NULL)
1222 notes_attrs->notes = notes;
1223 nattr = ¬es_attrs->attrs[0];
1224 for (loaded = i = 0; i < nsect; ++i) {
1225 if (sect_empty(&sechdrs[i]))
1227 if (sechdrs[i].sh_type == SHT_NOTE) {
1228 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1229 nattr->attr.mode = S_IRUGO;
1230 nattr->size = sechdrs[i].sh_size;
1231 nattr->private = (void *) sechdrs[i].sh_addr;
1232 nattr->read = module_notes_read;
1238 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1239 if (!notes_attrs->dir)
1242 for (i = 0; i < notes; ++i)
1243 if (sysfs_create_bin_file(notes_attrs->dir,
1244 ¬es_attrs->attrs[i]))
1247 mod->notes_attrs = notes_attrs;
1251 free_notes_attrs(notes_attrs, i);
1254 static void remove_notes_attrs(struct module *mod)
1256 if (mod->notes_attrs)
1257 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1262 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1263 char *sectstrings, Elf_Shdr *sechdrs)
1267 static inline void remove_sect_attrs(struct module *mod)
1271 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1272 char *sectstrings, Elf_Shdr *sechdrs)
1276 static inline void remove_notes_attrs(struct module *mod)
1282 int module_add_modinfo_attrs(struct module *mod)
1284 struct module_attribute *attr;
1285 struct module_attribute *temp_attr;
1289 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1290 (ARRAY_SIZE(modinfo_attrs) + 1)),
1292 if (!mod->modinfo_attrs)
1295 temp_attr = mod->modinfo_attrs;
1296 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1298 (attr->test && attr->test(mod))) {
1299 memcpy(temp_attr, attr, sizeof(*temp_attr));
1300 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1307 void module_remove_modinfo_attrs(struct module *mod)
1309 struct module_attribute *attr;
1312 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1313 /* pick a field to test for end of list */
1314 if (!attr->attr.name)
1316 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1320 kfree(mod->modinfo_attrs);
1323 int mod_sysfs_init(struct module *mod)
1326 struct kobject *kobj;
1328 if (!module_sysfs_initialized) {
1329 printk(KERN_ERR "%s: module sysfs not initialized\n",
1335 kobj = kset_find_obj(module_kset, mod->name);
1337 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1343 mod->mkobj.mod = mod;
1345 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1346 mod->mkobj.kobj.kset = module_kset;
1347 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1350 kobject_put(&mod->mkobj.kobj);
1352 /* delay uevent until full sysfs population */
1357 int mod_sysfs_setup(struct module *mod,
1358 struct kernel_param *kparam,
1359 unsigned int num_params)
1363 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1364 if (!mod->holders_dir) {
1369 err = module_param_sysfs_setup(mod, kparam, num_params);
1371 goto out_unreg_holders;
1373 err = module_add_modinfo_attrs(mod);
1375 goto out_unreg_param;
1377 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1381 module_param_sysfs_remove(mod);
1383 kobject_put(mod->holders_dir);
1385 kobject_put(&mod->mkobj.kobj);
1389 static void mod_sysfs_fini(struct module *mod)
1391 kobject_put(&mod->mkobj.kobj);
1394 #else /* CONFIG_SYSFS */
1396 static void mod_sysfs_fini(struct module *mod)
1400 #endif /* CONFIG_SYSFS */
1402 static void mod_kobject_remove(struct module *mod)
1404 module_remove_modinfo_attrs(mod);
1405 module_param_sysfs_remove(mod);
1406 kobject_put(mod->mkobj.drivers_dir);
1407 kobject_put(mod->holders_dir);
1408 mod_sysfs_fini(mod);
1412 * unlink the module with the whole machine is stopped with interrupts off
1413 * - this defends against kallsyms not taking locks
1415 static int __unlink_module(void *_mod)
1417 struct module *mod = _mod;
1418 list_del(&mod->list);
1422 /* Free a module, remove from lists, etc (must hold module_mutex). */
1423 static void free_module(struct module *mod)
1425 trace_module_free(mod);
1427 /* Delete from various lists */
1428 stop_machine(__unlink_module, mod, NULL);
1429 remove_notes_attrs(mod);
1430 remove_sect_attrs(mod);
1431 mod_kobject_remove(mod);
1433 unwind_remove_table(mod->unwind_info, 0);
1435 /* Arch-specific cleanup. */
1436 module_arch_cleanup(mod);
1438 /* Module unload stuff */
1439 module_unload_free(mod);
1441 /* Free any allocated parameters. */
1442 destroy_params(mod->kp, mod->num_kp);
1444 /* This may be NULL, but that's OK */
1445 module_free(mod, mod->module_init);
1448 percpu_modfree(mod->percpu);
1449 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1451 percpu_modfree(mod->refptr);
1453 /* Free lock-classes: */
1454 lockdep_free_key_range(mod->module_core, mod->core_size);
1456 /* Finally, free the core (containing the module structure) */
1457 module_free(mod, mod->module_core);
1460 update_protections(current->mm);
1464 void *__symbol_get(const char *symbol)
1466 struct module *owner;
1467 const struct kernel_symbol *sym;
1470 sym = find_symbol(symbol, &owner, NULL, true, true);
1471 if (sym && strong_try_module_get(owner))
1475 return sym ? (void *)sym->value : NULL;
1477 EXPORT_SYMBOL_GPL(__symbol_get);
1480 * Ensure that an exported symbol [global namespace] does not already exist
1481 * in the kernel or in some other module's exported symbol table.
1483 static int verify_export_symbols(struct module *mod)
1486 struct module *owner;
1487 const struct kernel_symbol *s;
1489 const struct kernel_symbol *sym;
1492 { mod->syms, mod->num_syms },
1493 { mod->gpl_syms, mod->num_gpl_syms },
1494 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1495 #ifdef CONFIG_UNUSED_SYMBOLS
1496 { mod->unused_syms, mod->num_unused_syms },
1497 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1501 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1502 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1503 if (find_symbol(s->name, &owner, NULL, true, false)) {
1505 "%s: exports duplicate symbol %s"
1507 mod->name, s->name, module_name(owner));
1515 /* Change all symbols so that st_value encodes the pointer directly. */
1516 static int simplify_symbols(Elf_Shdr *sechdrs,
1517 unsigned int symindex,
1519 unsigned int versindex,
1520 unsigned int pcpuindex,
1523 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1524 unsigned long secbase;
1525 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1527 const struct kernel_symbol *ksym;
1529 for (i = 1; i < n; i++) {
1530 switch (sym[i].st_shndx) {
1532 /* We compiled with -fno-common. These are not
1533 supposed to happen. */
1534 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1535 printk("%s: please compile with -fno-common\n",
1541 /* Don't need to do anything */
1542 DEBUGP("Absolute symbol: 0x%08lx\n",
1543 (long)sym[i].st_value);
1547 ksym = resolve_symbol(sechdrs, versindex,
1548 strtab + sym[i].st_name, mod);
1549 /* Ok if resolved. */
1551 sym[i].st_value = ksym->value;
1556 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1559 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1560 mod->name, strtab + sym[i].st_name);
1565 /* Divert to percpu allocation if a percpu var. */
1566 if (sym[i].st_shndx == pcpuindex)
1567 secbase = (unsigned long)mod->percpu;
1569 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1570 sym[i].st_value += secbase;
1578 /* Additional bytes needed by arch in front of individual sections */
1579 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1580 unsigned int section)
1582 /* default implementation just returns zero */
1586 /* Update size with this section: return offset. */
1587 static long get_offset(struct module *mod, unsigned int *size,
1588 Elf_Shdr *sechdr, unsigned int section)
1592 *size += arch_mod_section_prepend(mod, section);
1593 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1594 *size = ret + sechdr->sh_size;
1598 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1599 might -- code, read-only data, read-write data, small data. Tally
1600 sizes, and place the offsets into sh_entsize fields: high bit means it
1602 static void layout_sections(struct module *mod,
1603 const Elf_Ehdr *hdr,
1605 const char *secstrings)
1607 static unsigned long const masks[][2] = {
1608 /* NOTE: all executable code must be the first section
1609 * in this array; otherwise modify the text_size
1610 * finder in the two loops below */
1611 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1612 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1613 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1614 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1618 for (i = 0; i < hdr->e_shnum; i++)
1619 sechdrs[i].sh_entsize = ~0UL;
1621 DEBUGP("Core section allocation order:\n");
1622 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1623 for (i = 0; i < hdr->e_shnum; ++i) {
1624 Elf_Shdr *s = &sechdrs[i];
1626 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1627 || (s->sh_flags & masks[m][1])
1628 || s->sh_entsize != ~0UL
1629 || strstarts(secstrings + s->sh_name, ".init"))
1631 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1632 DEBUGP("\t%s\n", secstrings + s->sh_name);
1635 mod->core_text_size = mod->core_size;
1638 DEBUGP("Init section allocation order:\n");
1639 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1640 for (i = 0; i < hdr->e_shnum; ++i) {
1641 Elf_Shdr *s = &sechdrs[i];
1643 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1644 || (s->sh_flags & masks[m][1])
1645 || s->sh_entsize != ~0UL
1646 || !strstarts(secstrings + s->sh_name, ".init"))
1648 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1649 | INIT_OFFSET_MASK);
1650 DEBUGP("\t%s\n", secstrings + s->sh_name);
1653 mod->init_text_size = mod->init_size;
1657 static void set_license(struct module *mod, const char *license)
1660 license = "unspecified";
1662 if (!license_is_gpl_compatible(license)) {
1663 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1664 printk(KERN_WARNING "%s: module license '%s' taints "
1665 "kernel.\n", mod->name, license);
1666 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1670 /* Parse tag=value strings from .modinfo section */
1671 static char *next_string(char *string, unsigned long *secsize)
1673 /* Skip non-zero chars */
1676 if ((*secsize)-- <= 1)
1680 /* Skip any zero padding. */
1681 while (!string[0]) {
1683 if ((*secsize)-- <= 1)
1689 static char *get_modinfo(Elf_Shdr *sechdrs,
1694 unsigned int taglen = strlen(tag);
1695 unsigned long size = sechdrs[info].sh_size;
1697 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1698 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1699 return p + taglen + 1;
1704 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1705 unsigned int infoindex)
1707 struct module_attribute *attr;
1710 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1713 get_modinfo(sechdrs,
1719 static void free_modinfo(struct module *mod)
1721 struct module_attribute *attr;
1724 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1730 #ifdef CONFIG_KALLSYMS
1732 /* lookup symbol in given range of kernel_symbols */
1733 static const struct kernel_symbol *lookup_symbol(const char *name,
1734 const struct kernel_symbol *start,
1735 const struct kernel_symbol *stop)
1737 const struct kernel_symbol *ks = start;
1738 for (; ks < stop; ks++)
1739 if (strcmp(ks->name, name) == 0)
1744 static int is_exported(const char *name, unsigned long value,
1745 const struct module *mod)
1747 const struct kernel_symbol *ks;
1749 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1751 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1752 return ks != NULL && ks->value == value;
1756 static char elf_type(const Elf_Sym *sym,
1758 const char *secstrings,
1761 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1762 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1767 if (sym->st_shndx == SHN_UNDEF)
1769 if (sym->st_shndx == SHN_ABS)
1771 if (sym->st_shndx >= SHN_LORESERVE)
1773 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1775 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1776 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1777 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1779 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1784 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1785 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1790 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1795 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1798 const Elf_Shdr *sec;
1800 if (src->st_shndx == SHN_UNDEF
1801 || src->st_shndx >= shnum
1805 sec = sechdrs + src->st_shndx;
1806 if (!(sec->sh_flags & SHF_ALLOC)
1807 #ifndef CONFIG_KALLSYMS_ALL
1808 || !(sec->sh_flags & SHF_EXECINSTR)
1810 || (sec->sh_entsize & INIT_OFFSET_MASK))
1816 static unsigned long layout_symtab(struct module *mod,
1818 unsigned int symindex,
1819 unsigned int strindex,
1820 const Elf_Ehdr *hdr,
1821 const char *secstrings,
1822 unsigned long *pstroffs,
1823 unsigned long *strmap)
1825 unsigned long symoffs;
1826 Elf_Shdr *symsect = sechdrs + symindex;
1827 Elf_Shdr *strsect = sechdrs + strindex;
1830 unsigned int i, nsrc, ndst;
1832 /* Put symbol section at end of init part of module. */
1833 symsect->sh_flags |= SHF_ALLOC;
1834 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1835 symindex) | INIT_OFFSET_MASK;
1836 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1838 src = (void *)hdr + symsect->sh_offset;
1839 nsrc = symsect->sh_size / sizeof(*src);
1840 strtab = (void *)hdr + strsect->sh_offset;
1841 for (ndst = i = 1; i < nsrc; ++i, ++src)
1842 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1843 unsigned int j = src->st_name;
1845 while(!__test_and_set_bit(j, strmap) && strtab[j])
1850 /* Append room for core symbols at end of core part. */
1851 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1852 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1854 /* Put string table section at end of init part of module. */
1855 strsect->sh_flags |= SHF_ALLOC;
1856 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1857 strindex) | INIT_OFFSET_MASK;
1858 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1860 /* Append room for core symbols' strings at end of core part. */
1861 *pstroffs = mod->core_size;
1862 __set_bit(0, strmap);
1863 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1868 static void add_kallsyms(struct module *mod,
1871 unsigned int symindex,
1872 unsigned int strindex,
1873 unsigned long symoffs,
1874 unsigned long stroffs,
1875 const char *secstrings,
1876 unsigned long *strmap)
1878 unsigned int i, ndst;
1883 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1884 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1885 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1887 /* Set types up while we still have access to sections. */
1888 for (i = 0; i < mod->num_symtab; i++)
1889 mod->symtab[i].st_info
1890 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1892 mod->core_symtab = dst = mod->module_core + symoffs;
1895 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1896 if (!is_core_symbol(src, sechdrs, shnum))
1899 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1902 mod->core_num_syms = ndst;
1904 mod->core_strtab = s = mod->module_core + stroffs;
1905 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1906 if (test_bit(i, strmap))
1907 *++s = mod->strtab[i];
1910 static inline unsigned long layout_symtab(struct module *mod,
1912 unsigned int symindex,
1913 unsigned int strindex,
1914 const Elf_Ehdr *hdr,
1915 const char *secstrings,
1916 unsigned long *pstroffs,
1917 unsigned long *strmap)
1922 static inline void add_kallsyms(struct module *mod,
1925 unsigned int symindex,
1926 unsigned int strindex,
1927 unsigned long symoffs,
1928 unsigned long stroffs,
1929 const char *secstrings,
1930 const unsigned long *strmap)
1933 #endif /* CONFIG_KALLSYMS */
1935 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1937 #ifdef CONFIG_DYNAMIC_DEBUG
1938 if (ddebug_add_module(debug, num, debug->modname))
1939 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1944 static void *module_alloc_update_bounds(unsigned long size)
1946 void *ret = module_alloc(size);
1949 /* Update module bounds. */
1950 if ((unsigned long)ret < module_addr_min)
1951 module_addr_min = (unsigned long)ret;
1952 if ((unsigned long)ret + size > module_addr_max)
1953 module_addr_max = (unsigned long)ret + size;
1958 #ifdef CONFIG_DEBUG_KMEMLEAK
1959 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1960 Elf_Shdr *sechdrs, char *secstrings)
1964 /* only scan the sections containing data */
1965 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
1967 for (i = 1; i < hdr->e_shnum; i++) {
1968 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1970 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1971 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1974 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
1975 sechdrs[i].sh_size, GFP_KERNEL);
1979 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1980 Elf_Shdr *sechdrs, char *secstrings)
1985 /* Allocate and load the module: note that size of section 0 is always
1986 zero, and we rely on this for optional sections. */
1987 static noinline struct module *load_module(void __user *umod,
1989 const char __user *uargs)
1993 char *secstrings, *args, *modmagic, *strtab = NULL;
1996 unsigned int symindex = 0;
1997 unsigned int strindex = 0;
1998 unsigned int modindex, versindex, infoindex, pcpuindex;
1999 unsigned int unwindex = 0;
2002 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
2003 unsigned long symoffs, stroffs, *strmap;
2005 mm_segment_t old_fs;
2007 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2009 if (len < sizeof(*hdr))
2010 return ERR_PTR(-ENOEXEC);
2012 /* Suck in entire file: we'll want most of it. */
2013 /* vmalloc barfs on "unusual" numbers. Check here */
2014 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
2015 return ERR_PTR(-ENOMEM);
2017 if (copy_from_user(hdr, umod, len) != 0) {
2022 /* Sanity checks against insmoding binaries or wrong arch,
2023 weird elf version */
2024 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2025 || hdr->e_type != ET_REL
2026 || !elf_check_arch(hdr)
2027 || hdr->e_shentsize != sizeof(*sechdrs)) {
2032 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
2035 /* Convenience variables */
2036 sechdrs = (void *)hdr + hdr->e_shoff;
2037 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2038 sechdrs[0].sh_addr = 0;
2040 for (i = 1; i < hdr->e_shnum; i++) {
2041 if (sechdrs[i].sh_type != SHT_NOBITS
2042 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2045 /* Mark all sections sh_addr with their address in the
2047 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2049 /* Internal symbols and strings. */
2050 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2052 strindex = sechdrs[i].sh_link;
2053 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2055 #ifndef CONFIG_MODULE_UNLOAD
2056 /* Don't load .exit sections */
2057 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
2058 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2062 modindex = find_sec(hdr, sechdrs, secstrings,
2063 ".gnu.linkonce.this_module");
2065 printk(KERN_WARNING "No module found in object\n");
2069 /* This is temporary: point mod into copy of data. */
2070 mod = (void *)sechdrs[modindex].sh_addr;
2072 if (symindex == 0) {
2073 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2079 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2080 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2081 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2082 #ifdef ARCH_UNWIND_SECTION_NAME
2083 unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
2086 /* Don't keep modinfo and version sections. */
2087 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2088 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2090 sechdrs[unwindex].sh_flags |= SHF_ALLOC;
2092 /* Check module struct version now, before we try to use module. */
2093 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2098 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2099 /* This is allowed: modprobe --force will invalidate it. */
2101 err = try_to_force_load(mod, "bad vermagic");
2104 } else if (!same_magic(modmagic, vermagic, versindex)) {
2105 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2106 mod->name, modmagic, vermagic);
2111 staging = get_modinfo(sechdrs, infoindex, "staging");
2113 add_taint_module(mod, TAINT_CRAP);
2114 printk(KERN_WARNING "%s: module is from the staging directory,"
2115 " the quality is unknown, you have been warned.\n",
2119 /* Now copy in args */
2120 args = strndup_user(uargs, ~0UL >> 1);
2122 err = PTR_ERR(args);
2126 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2127 * sizeof(long), GFP_KERNEL);
2133 if (find_module(mod->name)) {
2138 mod->state = MODULE_STATE_COMING;
2140 /* Allow arches to frob section contents and sizes. */
2141 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2146 /* We have a special allocation for this section. */
2147 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2148 sechdrs[pcpuindex].sh_addralign,
2154 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2155 mod->percpu = percpu;
2158 /* Determine total sizes, and put offsets in sh_entsize. For now
2159 this is done generically; there doesn't appear to be any
2160 special cases for the architectures. */
2161 layout_sections(mod, hdr, sechdrs, secstrings);
2162 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2163 secstrings, &stroffs, strmap);
2165 /* Do the allocs. */
2166 ptr = module_alloc_update_bounds(mod->core_size);
2168 * The pointer to this block is stored in the module structure
2169 * which is inside the block. Just mark it as not being a
2172 kmemleak_not_leak(ptr);
2177 memset(ptr, 0, mod->core_size);
2178 mod->module_core = ptr;
2180 ptr = module_alloc_update_bounds(mod->init_size);
2182 * The pointer to this block is stored in the module structure
2183 * which is inside the block. This block doesn't need to be
2184 * scanned as it contains data and code that will be freed
2185 * after the module is initialized.
2187 kmemleak_ignore(ptr);
2188 if (!ptr && mod->init_size) {
2192 memset(ptr, 0, mod->init_size);
2193 mod->module_init = ptr;
2195 /* Transfer each section which specifies SHF_ALLOC */
2196 DEBUGP("final section addresses:\n");
2197 for (i = 0; i < hdr->e_shnum; i++) {
2200 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2203 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2204 dest = mod->module_init
2205 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2207 dest = mod->module_core + sechdrs[i].sh_entsize;
2209 if (sechdrs[i].sh_type != SHT_NOBITS)
2210 memcpy(dest, (void *)sechdrs[i].sh_addr,
2211 sechdrs[i].sh_size);
2212 /* Update sh_addr to point to copy in image. */
2213 sechdrs[i].sh_addr = (unsigned long)dest;
2214 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2216 /* Module has been moved. */
2217 mod = (void *)sechdrs[modindex].sh_addr;
2218 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2220 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2221 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2228 /* Now we've moved module, initialize linked lists, etc. */
2229 module_unload_init(mod);
2231 /* add kobject, so we can reference it. */
2232 err = mod_sysfs_init(mod);
2236 /* Set up license info based on the info section */
2237 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2240 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2241 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2242 * using GPL-only symbols it needs.
2244 if (strcmp(mod->name, "ndiswrapper") == 0)
2245 add_taint(TAINT_PROPRIETARY_MODULE);
2247 /* driverloader was caught wrongly pretending to be under GPL */
2248 if (strcmp(mod->name, "driverloader") == 0)
2249 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2251 /* Set up MODINFO_ATTR fields */
2252 setup_modinfo(mod, sechdrs, infoindex);
2254 /* Fix up syms, so that st_value is a pointer to location. */
2255 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2260 /* Now we've got everything in the final locations, we can
2261 * find optional sections. */
2262 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2263 sizeof(*mod->kp), &mod->num_kp);
2264 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2265 sizeof(*mod->syms), &mod->num_syms);
2266 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2267 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2268 sizeof(*mod->gpl_syms),
2269 &mod->num_gpl_syms);
2270 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2271 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2272 "__ksymtab_gpl_future",
2273 sizeof(*mod->gpl_future_syms),
2274 &mod->num_gpl_future_syms);
2275 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2276 "__kcrctab_gpl_future");
2278 #ifdef CONFIG_UNUSED_SYMBOLS
2279 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2281 sizeof(*mod->unused_syms),
2282 &mod->num_unused_syms);
2283 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2284 "__kcrctab_unused");
2285 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2286 "__ksymtab_unused_gpl",
2287 sizeof(*mod->unused_gpl_syms),
2288 &mod->num_unused_gpl_syms);
2289 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2290 "__kcrctab_unused_gpl");
2292 #ifdef CONFIG_CONSTRUCTORS
2293 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2294 sizeof(*mod->ctors), &mod->num_ctors);
2297 #ifdef CONFIG_TRACEPOINTS
2298 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2300 sizeof(*mod->tracepoints),
2301 &mod->num_tracepoints);
2303 #ifdef CONFIG_EVENT_TRACING
2304 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2306 sizeof(*mod->trace_events),
2307 &mod->num_trace_events);
2309 * This section contains pointers to allocated objects in the trace
2310 * code and not scanning it leads to false positives.
2312 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2313 mod->num_trace_events, GFP_KERNEL);
2315 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2316 /* sechdrs[0].sh_size is always zero */
2317 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2319 sizeof(*mod->ftrace_callsites),
2320 &mod->num_ftrace_callsites);
2322 #ifdef CONFIG_MODVERSIONS
2323 if ((mod->num_syms && !mod->crcs)
2324 || (mod->num_gpl_syms && !mod->gpl_crcs)
2325 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2326 #ifdef CONFIG_UNUSED_SYMBOLS
2327 || (mod->num_unused_syms && !mod->unused_crcs)
2328 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2331 err = try_to_force_load(mod,
2332 "no versions for exported symbols");
2338 /* Now do relocations. */
2339 for (i = 1; i < hdr->e_shnum; i++) {
2340 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2341 unsigned int info = sechdrs[i].sh_info;
2343 /* Not a valid relocation section? */
2344 if (info >= hdr->e_shnum)
2347 /* Don't bother with non-allocated sections */
2348 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2351 if (sechdrs[i].sh_type == SHT_REL)
2352 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2353 else if (sechdrs[i].sh_type == SHT_RELA)
2354 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2360 /* Find duplicate symbols */
2361 err = verify_export_symbols(mod);
2365 /* Set up and sort exception table */
2366 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2367 sizeof(*mod->extable), &mod->num_exentries);
2368 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2370 /* Finally, copy percpu area over. */
2371 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2372 sechdrs[pcpuindex].sh_size);
2374 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2375 symoffs, stroffs, secstrings, strmap);
2380 struct _ddebug *debug;
2381 unsigned int num_debug;
2383 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2384 sizeof(*debug), &num_debug);
2386 dynamic_debug_setup(debug, num_debug);
2389 err = module_finalize(hdr, sechdrs, mod);
2393 /* flush the icache in correct context */
2398 * Flush the instruction cache, since we've played with text.
2399 * Do it before processing of module parameters, so the module
2400 * can provide parameter accessor functions of its own.
2402 if (mod->module_init)
2403 flush_icache_range((unsigned long)mod->module_init,
2404 (unsigned long)mod->module_init
2406 flush_icache_range((unsigned long)mod->module_core,
2407 (unsigned long)mod->module_core + mod->core_size);
2412 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2413 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2416 /* Now sew it into the lists so we can get lockdep and oops
2417 * info during argument parsing. Noone should access us, since
2418 * strong_try_module_get() will fail.
2419 * lockdep/oops can run asynchronous, so use the RCU list insertion
2420 * function to insert in a way safe to concurrent readers.
2421 * The mutex protects against concurrent writers.
2423 list_add_rcu(&mod->list, &modules);
2425 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2429 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2432 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2433 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2435 #ifdef CONFIG_ENTERPRISE_SUPPORT
2436 /* We don't use add_taint() here because it also disables lockdep. */
2437 if (mod->taints & (1 << TAINT_EXTERNAL_SUPPORT))
2438 add_nonfatal_taint(TAINT_EXTERNAL_SUPPORT);
2439 else if (mod->taints == (1 << TAINT_NO_SUPPORT)) {
2440 if (unsupported == 0) {
2441 printk(KERN_WARNING "%s: module not supported by "
2442 "Novell, refusing to load. To override, echo "
2443 "1 > /proc/sys/kernel/unsupported\n", mod->name);
2447 add_nonfatal_taint(TAINT_NO_SUPPORT);
2448 if (unsupported == 1) {
2449 printk(KERN_WARNING "%s: module is not supported by "
2450 "Novell. Novell Technical Services may decline "
2451 "your support request if it involves a kernel "
2452 "fault.\n", mod->name);
2457 /* Size of section 0 is 0, so this works well if no unwind info. */
2458 mod->unwind_info = unwind_add_table(mod,
2459 (void *)sechdrs[unwindex].sh_addr,
2460 sechdrs[unwindex].sh_size);
2462 /* Get rid of temporary copy */
2465 trace_module_load(mod);
2471 /* Unlink carefully: kallsyms could be walking list. */
2472 list_del_rcu(&mod->list);
2473 synchronize_sched();
2474 module_arch_cleanup(mod);
2477 kobject_del(&mod->mkobj.kobj);
2478 kobject_put(&mod->mkobj.kobj);
2480 module_unload_free(mod);
2481 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2482 percpu_modfree(mod->refptr);
2485 module_free(mod, mod->module_init);
2487 module_free(mod, mod->module_core);
2488 /* mod will be freed with core. Don't access it beyond this line! */
2491 percpu_modfree(percpu);
2497 return ERR_PTR(err);
2500 printk(KERN_ERR "Module len %lu truncated\n", len);
2505 /* Call module constructors. */
2506 static void do_mod_ctors(struct module *mod)
2508 #ifdef CONFIG_CONSTRUCTORS
2511 for (i = 0; i < mod->num_ctors; i++)
2516 /* This is where the real work happens */
2517 SYSCALL_DEFINE3(init_module, void __user *, umod,
2518 unsigned long, len, const char __user *, uargs)
2523 /* Must have permission */
2524 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2527 /* Only one module load at a time, please */
2528 if (mutex_lock_interruptible(&module_mutex) != 0)
2531 /* Do all the hard work */
2532 mod = load_module(umod, len, uargs);
2534 mutex_unlock(&module_mutex);
2535 return PTR_ERR(mod);
2538 /* Drop lock so they can recurse */
2539 mutex_unlock(&module_mutex);
2541 blocking_notifier_call_chain(&module_notify_list,
2542 MODULE_STATE_COMING, mod);
2545 /* Start the module */
2546 if (mod->init != NULL)
2547 ret = do_one_initcall(mod->init);
2549 /* Init routine failed: abort. Try to protect us from
2550 buggy refcounters. */
2551 mod->state = MODULE_STATE_GOING;
2552 synchronize_sched();
2554 blocking_notifier_call_chain(&module_notify_list,
2555 MODULE_STATE_GOING, mod);
2556 mutex_lock(&module_mutex);
2558 mutex_unlock(&module_mutex);
2559 wake_up(&module_wq);
2564 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2565 "%s: loading module anyway...\n",
2566 __func__, mod->name, ret,
2571 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2572 mod->state = MODULE_STATE_LIVE;
2573 wake_up(&module_wq);
2574 blocking_notifier_call_chain(&module_notify_list,
2575 MODULE_STATE_LIVE, mod);
2577 /* We need to finish all async code before the module init sequence is done */
2578 async_synchronize_full();
2580 mutex_lock(&module_mutex);
2581 /* Drop initial reference. */
2583 trim_init_extable(mod);
2584 unwind_remove_table(mod->unwind_info, 1);
2585 #ifdef CONFIG_KALLSYMS
2586 mod->num_symtab = mod->core_num_syms;
2587 mod->symtab = mod->core_symtab;
2588 mod->strtab = mod->core_strtab;
2590 module_free(mod, mod->module_init);
2591 mod->module_init = NULL;
2593 mod->init_text_size = 0;
2594 mutex_unlock(&module_mutex);
2599 static inline int within(unsigned long addr, void *start, unsigned long size)
2601 return ((void *)addr >= start && (void *)addr < start + size);
2604 #ifdef CONFIG_KALLSYMS
2606 * This ignores the intensely annoying "mapping symbols" found
2607 * in ARM ELF files: $a, $t and $d.
2609 static inline int is_arm_mapping_symbol(const char *str)
2611 return str[0] == '$' && strchr("atd", str[1])
2612 && (str[2] == '\0' || str[2] == '.');
2615 static const char *get_ksymbol(struct module *mod,
2617 unsigned long *size,
2618 unsigned long *offset)
2620 unsigned int i, best = 0;
2621 unsigned long nextval;
2623 /* At worse, next value is at end of module */
2624 if (within_module_init(addr, mod))
2625 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2627 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2629 /* Scan for closest preceeding symbol, and next symbol. (ELF
2630 starts real symbols at 1). */
2631 for (i = 1; i < mod->num_symtab; i++) {
2632 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2635 /* We ignore unnamed symbols: they're uninformative
2636 * and inserted at a whim. */
2637 if (mod->symtab[i].st_value <= addr
2638 && mod->symtab[i].st_value > mod->symtab[best].st_value
2639 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2640 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2642 if (mod->symtab[i].st_value > addr
2643 && mod->symtab[i].st_value < nextval
2644 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2645 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2646 nextval = mod->symtab[i].st_value;
2653 *size = nextval - mod->symtab[best].st_value;
2655 *offset = addr - mod->symtab[best].st_value;
2656 return mod->strtab + mod->symtab[best].st_name;
2659 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2660 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2661 const char *module_address_lookup(unsigned long addr,
2662 unsigned long *size,
2663 unsigned long *offset,
2668 const char *ret = NULL;
2671 list_for_each_entry_rcu(mod, &modules, list) {
2672 if (within_module_init(addr, mod) ||
2673 within_module_core(addr, mod)) {
2675 *modname = mod->name;
2676 ret = get_ksymbol(mod, addr, size, offset);
2680 /* Make a copy in here where it's safe */
2682 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2689 int lookup_module_symbol_name(unsigned long addr, char *symname)
2694 list_for_each_entry_rcu(mod, &modules, list) {
2695 if (within_module_init(addr, mod) ||
2696 within_module_core(addr, mod)) {
2699 sym = get_ksymbol(mod, addr, NULL, NULL);
2702 strlcpy(symname, sym, KSYM_NAME_LEN);
2712 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2713 unsigned long *offset, char *modname, char *name)
2718 list_for_each_entry_rcu(mod, &modules, list) {
2719 if (within_module_init(addr, mod) ||
2720 within_module_core(addr, mod)) {
2723 sym = get_ksymbol(mod, addr, size, offset);
2727 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2729 strlcpy(name, sym, KSYM_NAME_LEN);
2740 #include <linux/kdb.h>
2741 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
2742 #endif /* CONFIG_KDB */
2744 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2745 char *name, char *module_name, int *exported)
2749 int get_lock = !KDB_IS_RUNNING();
2756 list_for_each_entry_rcu(mod, &modules, list) {
2757 if (symnum < mod->num_symtab) {
2758 *value = mod->symtab[symnum].st_value;
2759 *type = mod->symtab[symnum].st_info;
2760 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2762 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2763 *exported = is_exported(name, *value, mod);
2768 symnum -= mod->num_symtab;
2775 static unsigned long mod_find_symname(struct module *mod, const char *name)
2779 for (i = 0; i < mod->num_symtab; i++)
2780 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2781 mod->symtab[i].st_info != 'U')
2782 return mod->symtab[i].st_value;
2786 /* Look for this name: can be of form module:name. */
2787 unsigned long module_kallsyms_lookup_name(const char *name)
2791 unsigned long ret = 0;
2793 /* Don't lock: we're in enough trouble already. */
2795 if ((colon = strchr(name, ':')) != NULL) {
2797 if ((mod = find_module(name)) != NULL)
2798 ret = mod_find_symname(mod, colon+1);
2801 list_for_each_entry_rcu(mod, &modules, list)
2802 if ((ret = mod_find_symname(mod, name)) != 0)
2809 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2810 struct module *, unsigned long),
2817 list_for_each_entry(mod, &modules, list) {
2818 for (i = 0; i < mod->num_symtab; i++) {
2819 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2820 mod, mod->symtab[i].st_value);
2827 #endif /* CONFIG_KALLSYMS */
2829 static char *module_flags(struct module *mod, char *buf)
2834 mod->state == MODULE_STATE_GOING ||
2835 mod->state == MODULE_STATE_COMING) {
2837 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2839 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2841 if (mod->taints & (1 << TAINT_CRAP))
2843 #ifdef CONFIG_ENTERPRISE_SUPPORT
2844 if (mod->taints & (1 << TAINT_NO_SUPPORT))
2846 if (mod->taints & (1 << TAINT_EXTERNAL_SUPPORT))
2850 * TAINT_FORCED_RMMOD: could be added.
2851 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2855 /* Show a - for module-is-being-unloaded */
2856 if (mod->state == MODULE_STATE_GOING)
2858 /* Show a + for module-is-being-loaded */
2859 if (mod->state == MODULE_STATE_COMING)
2868 #ifdef CONFIG_PROC_FS
2869 /* Called by the /proc file system to return a list of modules. */
2870 static void *m_start(struct seq_file *m, loff_t *pos)
2872 mutex_lock(&module_mutex);
2873 return seq_list_start(&modules, *pos);
2876 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2878 return seq_list_next(p, &modules, pos);
2881 static void m_stop(struct seq_file *m, void *p)
2883 mutex_unlock(&module_mutex);
2886 static int m_show(struct seq_file *m, void *p)
2888 struct module *mod = list_entry(p, struct module, list);
2891 seq_printf(m, "%s %u",
2892 mod->name, mod->init_size + mod->core_size);
2893 print_unload_info(m, mod);
2895 /* Informative for users. */
2896 seq_printf(m, " %s",
2897 mod->state == MODULE_STATE_GOING ? "Unloading":
2898 mod->state == MODULE_STATE_COMING ? "Loading":
2900 /* Used by oprofile and other similar tools. */
2901 seq_printf(m, " 0x%p", mod->module_core);
2905 seq_printf(m, " %s", module_flags(mod, buf));
2907 seq_printf(m, "\n");
2911 /* Format: modulename size refcount deps address
2913 Where refcount is a number or -, and deps is a comma-separated list
2916 static const struct seq_operations modules_op = {
2923 static int modules_open(struct inode *inode, struct file *file)
2925 return seq_open(file, &modules_op);
2928 static const struct file_operations proc_modules_operations = {
2929 .open = modules_open,
2931 .llseek = seq_lseek,
2932 .release = seq_release,
2935 static int __init proc_modules_init(void)
2937 proc_create("modules", 0, NULL, &proc_modules_operations);
2940 module_init(proc_modules_init);
2943 /* Given an address, look for it in the module exception tables. */
2944 const struct exception_table_entry *search_module_extables(unsigned long addr)
2946 const struct exception_table_entry *e = NULL;
2950 list_for_each_entry_rcu(mod, &modules, list) {
2951 if (mod->num_exentries == 0)
2954 e = search_extable(mod->extable,
2955 mod->extable + mod->num_exentries - 1,
2962 /* Now, if we found one, we are running inside it now, hence
2963 we cannot unload the module, hence no refcnt needed. */
2968 * is_module_address - is this address inside a module?
2969 * @addr: the address to check.
2971 * See is_module_text_address() if you simply want to see if the address
2972 * is code (not data).
2974 bool is_module_address(unsigned long addr)
2979 ret = __module_address(addr) != NULL;
2986 * __module_address - get the module which contains an address.
2987 * @addr: the address.
2989 * Must be called with preempt disabled or module mutex held so that
2990 * module doesn't get freed during this.
2992 struct module *__module_address(unsigned long addr)
2996 if (addr < module_addr_min || addr > module_addr_max)
2999 list_for_each_entry_rcu(mod, &modules, list)
3000 if (within_module_core(addr, mod)
3001 || within_module_init(addr, mod))
3005 EXPORT_SYMBOL_GPL(__module_address);
3008 * is_module_text_address - is this address inside module code?
3009 * @addr: the address to check.
3011 * See is_module_address() if you simply want to see if the address is
3012 * anywhere in a module. See kernel_text_address() for testing if an
3013 * address corresponds to kernel or module code.
3015 bool is_module_text_address(unsigned long addr)
3020 ret = __module_text_address(addr) != NULL;
3027 * __module_text_address - get the module whose code contains an address.
3028 * @addr: the address.
3030 * Must be called with preempt disabled or module mutex held so that
3031 * module doesn't get freed during this.
3033 struct module *__module_text_address(unsigned long addr)
3035 struct module *mod = __module_address(addr);
3037 /* Make sure it's within the text section. */
3038 if (!within(addr, mod->module_init, mod->init_text_size)
3039 && !within(addr, mod->module_core, mod->core_text_size))
3044 EXPORT_SYMBOL_GPL(__module_text_address);
3046 /* Don't grab lock, we're oopsing. */
3047 void print_modules(void)
3052 printk(KERN_DEFAULT "Modules linked in:");
3053 /* Most callers should already have preempt disabled, but make sure */
3055 list_for_each_entry_rcu(mod, &modules, list)
3056 printk(" %s%s", mod->name, module_flags(mod, buf));
3058 if (last_unloaded_module[0])
3059 printk(" [last unloaded: %s]", last_unloaded_module);
3061 #ifdef CONFIG_ENTERPRISE_SUPPORT
3062 printk("Supported: %s\n", supported_printable(get_taint()));
3066 #ifdef CONFIG_MODVERSIONS
3067 /* Generate the signature for all relevant module structures here.
3068 * If these change, we don't want to try to parse the module. */
3069 void module_layout(struct module *mod,
3070 struct modversion_info *ver,
3071 struct kernel_param *kp,
3072 struct kernel_symbol *ks,
3073 struct tracepoint *tp)
3076 EXPORT_SYMBOL(module_layout);
3079 #ifdef CONFIG_TRACEPOINTS
3080 void module_update_tracepoints(void)
3084 mutex_lock(&module_mutex);
3085 list_for_each_entry(mod, &modules, list)
3087 tracepoint_update_probe_range(mod->tracepoints,
3088 mod->tracepoints + mod->num_tracepoints);
3089 mutex_unlock(&module_mutex);
3093 * Returns 0 if current not found.
3094 * Returns 1 if current found.
3096 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3098 struct module *iter_mod;
3101 mutex_lock(&module_mutex);
3102 list_for_each_entry(iter_mod, &modules, list) {
3103 if (!iter_mod->taints) {
3105 * Sorted module list
3107 if (iter_mod < iter->module)
3109 else if (iter_mod > iter->module)
3110 iter->tracepoint = NULL;
3111 found = tracepoint_get_iter_range(&iter->tracepoint,
3112 iter_mod->tracepoints,
3113 iter_mod->tracepoints
3114 + iter_mod->num_tracepoints);
3116 iter->module = iter_mod;
3121 mutex_unlock(&module_mutex);