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Commit | Line | Data |
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f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
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. | |
9 | ||
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. | |
14 | ||
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 | |
18 | */ | |
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/moduleloader.h> | |
6d723736 | 21 | #include <linux/ftrace_event.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
3b5d5c6b | 24 | #include <linux/fs.h> |
6d760133 | 25 | #include <linux/sysfs.h> |
9f158333 | 26 | #include <linux/kernel.h> |
1da177e4 LT |
27 | #include <linux/slab.h> |
28 | #include <linux/vmalloc.h> | |
29 | #include <linux/elf.h> | |
3b5d5c6b | 30 | #include <linux/proc_fs.h> |
1da177e4 LT |
31 | #include <linux/seq_file.h> |
32 | #include <linux/syscalls.h> | |
33 | #include <linux/fcntl.h> | |
34 | #include <linux/rcupdate.h> | |
c59ede7b | 35 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
f6a57033 | 42 | #include <linux/sched.h> |
1da177e4 LT |
43 | #include <linux/stop_machine.h> |
44 | #include <linux/device.h> | |
c988d2b2 | 45 | #include <linux/string.h> |
97d1f15b | 46 | #include <linux/mutex.h> |
d72b3751 | 47 | #include <linux/rculist.h> |
1da177e4 | 48 | #include <asm/uaccess.h> |
1da177e4 | 49 | #include <asm/cacheflush.h> |
eb8cdec4 | 50 | #include <asm/mmu_context.h> |
b817f6fe | 51 | #include <linux/license.h> |
6d762394 | 52 | #include <asm/sections.h> |
97e1c18e | 53 | #include <linux/tracepoint.h> |
90d595fe | 54 | #include <linux/ftrace.h> |
22a9d645 | 55 | #include <linux/async.h> |
fbf59bc9 | 56 | #include <linux/percpu.h> |
4f2294b6 | 57 | #include <linux/kmemleak.h> |
bf5438fc | 58 | #include <linux/jump_label.h> |
84e1c6bb | 59 | #include <linux/pfn.h> |
1da177e4 | 60 | |
7ead8b83 LZ |
61 | #define CREATE_TRACE_POINTS |
62 | #include <trace/events/module.h> | |
63 | ||
1da177e4 LT |
64 | #if 0 |
65 | #define DEBUGP printk | |
66 | #else | |
67 | #define DEBUGP(fmt , a...) | |
68 | #endif | |
69 | ||
70 | #ifndef ARCH_SHF_SMALL | |
71 | #define ARCH_SHF_SMALL 0 | |
72 | #endif | |
73 | ||
84e1c6bb MC |
74 | /* |
75 | * Modules' sections will be aligned on page boundaries | |
76 | * to ensure complete separation of code and data, but | |
77 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
78 | */ | |
79 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
80 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
81 | #else | |
82 | # define debug_align(X) (X) | |
83 | #endif | |
84 | ||
85 | /* | |
86 | * Given BASE and SIZE this macro calculates the number of pages the | |
87 | * memory regions occupies | |
88 | */ | |
89 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ | |
90 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ | |
91 | PFN_DOWN((unsigned long)BASE) + 1) \ | |
92 | : (0UL)) | |
93 | ||
1da177e4 LT |
94 | /* If this is set, the section belongs in the init part of the module */ |
95 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
96 | ||
75676500 RR |
97 | /* |
98 | * Mutex protects: | |
99 | * 1) List of modules (also safely readable with preempt_disable), | |
100 | * 2) module_use links, | |
101 | * 3) module_addr_min/module_addr_max. | |
d72b3751 | 102 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
103 | DEFINE_MUTEX(module_mutex); |
104 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 105 | static LIST_HEAD(modules); |
67fc4e0c JW |
106 | #ifdef CONFIG_KGDB_KDB |
107 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
108 | #endif /* CONFIG_KGDB_KDB */ | |
109 | ||
1da177e4 | 110 | |
19e4529e SR |
111 | /* Block module loading/unloading? */ |
112 | int modules_disabled = 0; | |
113 | ||
c9a3ba55 RR |
114 | /* Waiting for a module to finish initializing? */ |
115 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
116 | ||
e041c683 | 117 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 118 | |
75676500 RR |
119 | /* Bounds of module allocation, for speeding __module_address. |
120 | * Protected by module_mutex. */ | |
3a642e99 RR |
121 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
122 | ||
1da177e4 LT |
123 | int register_module_notifier(struct notifier_block * nb) |
124 | { | |
e041c683 | 125 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
126 | } |
127 | EXPORT_SYMBOL(register_module_notifier); | |
128 | ||
129 | int unregister_module_notifier(struct notifier_block * nb) | |
130 | { | |
e041c683 | 131 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
132 | } |
133 | EXPORT_SYMBOL(unregister_module_notifier); | |
134 | ||
eded41c1 RR |
135 | struct load_info { |
136 | Elf_Ehdr *hdr; | |
137 | unsigned long len; | |
138 | Elf_Shdr *sechdrs; | |
6526c534 | 139 | char *secstrings, *strtab; |
d913188c RR |
140 | unsigned long *strmap; |
141 | unsigned long symoffs, stroffs; | |
811d66a0 RR |
142 | struct _ddebug *debug; |
143 | unsigned int num_debug; | |
eded41c1 RR |
144 | struct { |
145 | unsigned int sym, str, mod, vers, info, pcpu; | |
146 | } index; | |
147 | }; | |
148 | ||
9a4b9708 ML |
149 | /* We require a truly strong try_module_get(): 0 means failure due to |
150 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
151 | static inline int strong_try_module_get(struct module *mod) |
152 | { | |
153 | if (mod && mod->state == MODULE_STATE_COMING) | |
c9a3ba55 RR |
154 | return -EBUSY; |
155 | if (try_module_get(mod)) | |
1da177e4 | 156 | return 0; |
c9a3ba55 RR |
157 | else |
158 | return -ENOENT; | |
1da177e4 LT |
159 | } |
160 | ||
fa3ba2e8 FM |
161 | static inline void add_taint_module(struct module *mod, unsigned flag) |
162 | { | |
163 | add_taint(flag); | |
25ddbb18 | 164 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
165 | } |
166 | ||
02a3e59a RD |
167 | /* |
168 | * A thread that wants to hold a reference to a module only while it | |
169 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
170 | */ |
171 | void __module_put_and_exit(struct module *mod, long code) | |
172 | { | |
173 | module_put(mod); | |
174 | do_exit(code); | |
175 | } | |
176 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 177 | |
1da177e4 | 178 | /* Find a module section: 0 means not found. */ |
49668688 | 179 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
180 | { |
181 | unsigned int i; | |
182 | ||
49668688 RR |
183 | for (i = 1; i < info->hdr->e_shnum; i++) { |
184 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 185 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
186 | if ((shdr->sh_flags & SHF_ALLOC) |
187 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 188 | return i; |
49668688 | 189 | } |
1da177e4 LT |
190 | return 0; |
191 | } | |
192 | ||
5e458cc0 | 193 | /* Find a module section, or NULL. */ |
49668688 | 194 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
195 | { |
196 | /* Section 0 has sh_addr 0. */ | |
49668688 | 197 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
198 | } |
199 | ||
200 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 201 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
202 | const char *name, |
203 | size_t object_size, | |
204 | unsigned int *num) | |
205 | { | |
49668688 | 206 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
207 | |
208 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
209 | *num = info->sechdrs[sec].sh_size / object_size; |
210 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
211 | } |
212 | ||
1da177e4 LT |
213 | /* Provided by the linker */ |
214 | extern const struct kernel_symbol __start___ksymtab[]; | |
215 | extern const struct kernel_symbol __stop___ksymtab[]; | |
216 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
217 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
218 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
219 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
220 | extern const unsigned long __start___kcrctab[]; |
221 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 222 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
223 | #ifdef CONFIG_UNUSED_SYMBOLS |
224 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
225 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
226 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
227 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
228 | extern const unsigned long __start___kcrctab_unused[]; |
229 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 230 | #endif |
1da177e4 LT |
231 | |
232 | #ifndef CONFIG_MODVERSIONS | |
233 | #define symversion(base, idx) NULL | |
234 | #else | |
f83ca9fe | 235 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
236 | #endif |
237 | ||
dafd0940 RR |
238 | static bool each_symbol_in_section(const struct symsearch *arr, |
239 | unsigned int arrsize, | |
240 | struct module *owner, | |
241 | bool (*fn)(const struct symsearch *syms, | |
242 | struct module *owner, | |
243 | unsigned int symnum, void *data), | |
244 | void *data) | |
ad9546c9 | 245 | { |
dafd0940 | 246 | unsigned int i, j; |
ad9546c9 | 247 | |
dafd0940 RR |
248 | for (j = 0; j < arrsize; j++) { |
249 | for (i = 0; i < arr[j].stop - arr[j].start; i++) | |
250 | if (fn(&arr[j], owner, i, data)) | |
251 | return true; | |
f71d20e9 | 252 | } |
dafd0940 RR |
253 | |
254 | return false; | |
ad9546c9 RR |
255 | } |
256 | ||
dafd0940 | 257 | /* Returns true as soon as fn returns true, otherwise false. */ |
c6b37801 TA |
258 | bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, |
259 | unsigned int symnum, void *data), void *data) | |
ad9546c9 RR |
260 | { |
261 | struct module *mod; | |
44032e63 | 262 | static const struct symsearch arr[] = { |
ad9546c9 | 263 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 264 | NOT_GPL_ONLY, false }, |
ad9546c9 | 265 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
266 | __start___kcrctab_gpl, |
267 | GPL_ONLY, false }, | |
ad9546c9 | 268 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
269 | __start___kcrctab_gpl_future, |
270 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 271 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 272 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
273 | __start___kcrctab_unused, |
274 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 275 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
276 | __start___kcrctab_unused_gpl, |
277 | GPL_ONLY, true }, | |
f7f5b675 | 278 | #endif |
ad9546c9 | 279 | }; |
f71d20e9 | 280 | |
dafd0940 RR |
281 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
282 | return true; | |
f71d20e9 | 283 | |
d72b3751 | 284 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
285 | struct symsearch arr[] = { |
286 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 287 | NOT_GPL_ONLY, false }, |
ad9546c9 | 288 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
289 | mod->gpl_crcs, |
290 | GPL_ONLY, false }, | |
ad9546c9 RR |
291 | { mod->gpl_future_syms, |
292 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
293 | mod->gpl_future_crcs, |
294 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 295 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
296 | { mod->unused_syms, |
297 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
298 | mod->unused_crcs, |
299 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
300 | { mod->unused_gpl_syms, |
301 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
302 | mod->unused_gpl_crcs, |
303 | GPL_ONLY, true }, | |
f7f5b675 | 304 | #endif |
ad9546c9 RR |
305 | }; |
306 | ||
dafd0940 RR |
307 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
308 | return true; | |
309 | } | |
310 | return false; | |
311 | } | |
c6b37801 | 312 | EXPORT_SYMBOL_GPL(each_symbol); |
dafd0940 RR |
313 | |
314 | struct find_symbol_arg { | |
315 | /* Input */ | |
316 | const char *name; | |
317 | bool gplok; | |
318 | bool warn; | |
319 | ||
320 | /* Output */ | |
321 | struct module *owner; | |
322 | const unsigned long *crc; | |
414fd31b | 323 | const struct kernel_symbol *sym; |
dafd0940 RR |
324 | }; |
325 | ||
326 | static bool find_symbol_in_section(const struct symsearch *syms, | |
327 | struct module *owner, | |
328 | unsigned int symnum, void *data) | |
329 | { | |
330 | struct find_symbol_arg *fsa = data; | |
331 | ||
332 | if (strcmp(syms->start[symnum].name, fsa->name) != 0) | |
333 | return false; | |
334 | ||
335 | if (!fsa->gplok) { | |
336 | if (syms->licence == GPL_ONLY) | |
337 | return false; | |
338 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
339 | printk(KERN_WARNING "Symbol %s is being used " | |
340 | "by a non-GPL module, which will not " | |
341 | "be allowed in the future\n", fsa->name); | |
342 | printk(KERN_WARNING "Please see the file " | |
343 | "Documentation/feature-removal-schedule.txt " | |
344 | "in the kernel source tree for more details.\n"); | |
9f28bb7e | 345 | } |
1da177e4 | 346 | } |
ad9546c9 | 347 | |
f7f5b675 | 348 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
349 | if (syms->unused && fsa->warn) { |
350 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
351 | "however this module is using it.\n", fsa->name); | |
352 | printk(KERN_WARNING | |
353 | "This symbol will go away in the future.\n"); | |
354 | printk(KERN_WARNING | |
355 | "Please evalute if this is the right api to use and if " | |
356 | "it really is, submit a report the linux kernel " | |
357 | "mailinglist together with submitting your code for " | |
358 | "inclusion.\n"); | |
359 | } | |
f7f5b675 | 360 | #endif |
dafd0940 RR |
361 | |
362 | fsa->owner = owner; | |
363 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 364 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
365 | return true; |
366 | } | |
367 | ||
414fd31b | 368 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 369 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
370 | const struct kernel_symbol *find_symbol(const char *name, |
371 | struct module **owner, | |
372 | const unsigned long **crc, | |
373 | bool gplok, | |
374 | bool warn) | |
dafd0940 RR |
375 | { |
376 | struct find_symbol_arg fsa; | |
377 | ||
378 | fsa.name = name; | |
379 | fsa.gplok = gplok; | |
380 | fsa.warn = warn; | |
381 | ||
382 | if (each_symbol(find_symbol_in_section, &fsa)) { | |
383 | if (owner) | |
384 | *owner = fsa.owner; | |
385 | if (crc) | |
386 | *crc = fsa.crc; | |
414fd31b | 387 | return fsa.sym; |
dafd0940 RR |
388 | } |
389 | ||
1da177e4 | 390 | DEBUGP("Failed to find symbol %s\n", name); |
414fd31b | 391 | return NULL; |
1da177e4 | 392 | } |
c6b37801 | 393 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 394 | |
1da177e4 | 395 | /* Search for module by name: must hold module_mutex. */ |
c6b37801 | 396 | struct module *find_module(const char *name) |
1da177e4 LT |
397 | { |
398 | struct module *mod; | |
399 | ||
400 | list_for_each_entry(mod, &modules, list) { | |
401 | if (strcmp(mod->name, name) == 0) | |
402 | return mod; | |
403 | } | |
404 | return NULL; | |
405 | } | |
c6b37801 | 406 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
407 | |
408 | #ifdef CONFIG_SMP | |
fbf59bc9 | 409 | |
259354de | 410 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 411 | { |
259354de TH |
412 | return mod->percpu; |
413 | } | |
fbf59bc9 | 414 | |
259354de TH |
415 | static int percpu_modalloc(struct module *mod, |
416 | unsigned long size, unsigned long align) | |
417 | { | |
fbf59bc9 TH |
418 | if (align > PAGE_SIZE) { |
419 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 420 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
421 | align = PAGE_SIZE; |
422 | } | |
423 | ||
259354de TH |
424 | mod->percpu = __alloc_reserved_percpu(size, align); |
425 | if (!mod->percpu) { | |
fbf59bc9 | 426 | printk(KERN_WARNING |
d913188c RR |
427 | "%s: Could not allocate %lu bytes percpu data\n", |
428 | mod->name, size); | |
259354de TH |
429 | return -ENOMEM; |
430 | } | |
431 | mod->percpu_size = size; | |
432 | return 0; | |
fbf59bc9 TH |
433 | } |
434 | ||
259354de | 435 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 436 | { |
259354de | 437 | free_percpu(mod->percpu); |
fbf59bc9 TH |
438 | } |
439 | ||
49668688 | 440 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 441 | { |
49668688 | 442 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
443 | } |
444 | ||
259354de TH |
445 | static void percpu_modcopy(struct module *mod, |
446 | const void *from, unsigned long size) | |
6b588c18 TH |
447 | { |
448 | int cpu; | |
449 | ||
450 | for_each_possible_cpu(cpu) | |
259354de | 451 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
452 | } |
453 | ||
10fad5e4 TH |
454 | /** |
455 | * is_module_percpu_address - test whether address is from module static percpu | |
456 | * @addr: address to test | |
457 | * | |
458 | * Test whether @addr belongs to module static percpu area. | |
459 | * | |
460 | * RETURNS: | |
461 | * %true if @addr is from module static percpu area | |
462 | */ | |
463 | bool is_module_percpu_address(unsigned long addr) | |
464 | { | |
465 | struct module *mod; | |
466 | unsigned int cpu; | |
467 | ||
468 | preempt_disable(); | |
469 | ||
470 | list_for_each_entry_rcu(mod, &modules, list) { | |
471 | if (!mod->percpu_size) | |
472 | continue; | |
473 | for_each_possible_cpu(cpu) { | |
474 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
475 | ||
476 | if ((void *)addr >= start && | |
477 | (void *)addr < start + mod->percpu_size) { | |
478 | preempt_enable(); | |
479 | return true; | |
480 | } | |
481 | } | |
482 | } | |
483 | ||
484 | preempt_enable(); | |
485 | return false; | |
6b588c18 TH |
486 | } |
487 | ||
1da177e4 | 488 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 489 | |
259354de | 490 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
491 | { |
492 | return NULL; | |
493 | } | |
259354de TH |
494 | static inline int percpu_modalloc(struct module *mod, |
495 | unsigned long size, unsigned long align) | |
496 | { | |
497 | return -ENOMEM; | |
498 | } | |
499 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 500 | { |
1da177e4 | 501 | } |
49668688 | 502 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
503 | { |
504 | return 0; | |
505 | } | |
259354de TH |
506 | static inline void percpu_modcopy(struct module *mod, |
507 | const void *from, unsigned long size) | |
1da177e4 LT |
508 | { |
509 | /* pcpusec should be 0, and size of that section should be 0. */ | |
510 | BUG_ON(size != 0); | |
511 | } | |
10fad5e4 TH |
512 | bool is_module_percpu_address(unsigned long addr) |
513 | { | |
514 | return false; | |
515 | } | |
6b588c18 | 516 | |
1da177e4 LT |
517 | #endif /* CONFIG_SMP */ |
518 | ||
c988d2b2 MD |
519 | #define MODINFO_ATTR(field) \ |
520 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
521 | { \ | |
522 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
523 | } \ | |
524 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
525 | struct module *mod, char *buffer) \ | |
526 | { \ | |
527 | return sprintf(buffer, "%s\n", mod->field); \ | |
528 | } \ | |
529 | static int modinfo_##field##_exists(struct module *mod) \ | |
530 | { \ | |
531 | return mod->field != NULL; \ | |
532 | } \ | |
533 | static void free_modinfo_##field(struct module *mod) \ | |
534 | { \ | |
22a8bdeb DW |
535 | kfree(mod->field); \ |
536 | mod->field = NULL; \ | |
c988d2b2 MD |
537 | } \ |
538 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 539 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
540 | .show = show_modinfo_##field, \ |
541 | .setup = setup_modinfo_##field, \ | |
542 | .test = modinfo_##field##_exists, \ | |
543 | .free = free_modinfo_##field, \ | |
544 | }; | |
545 | ||
546 | MODINFO_ATTR(version); | |
547 | MODINFO_ATTR(srcversion); | |
548 | ||
e14af7ee AV |
549 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
550 | ||
03e88ae1 | 551 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
552 | |
553 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
554 | ||
1da177e4 | 555 | /* Init the unload section of the module. */ |
9f85a4bb | 556 | static int module_unload_init(struct module *mod) |
1da177e4 | 557 | { |
9f85a4bb RR |
558 | mod->refptr = alloc_percpu(struct module_ref); |
559 | if (!mod->refptr) | |
560 | return -ENOMEM; | |
561 | ||
2c02dfe7 LT |
562 | INIT_LIST_HEAD(&mod->source_list); |
563 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 564 | |
1da177e4 | 565 | /* Hold reference count during initialization. */ |
5fbfb18d | 566 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
567 | /* Backwards compatibility macros put refcount during init. */ |
568 | mod->waiter = current; | |
9f85a4bb RR |
569 | |
570 | return 0; | |
1da177e4 LT |
571 | } |
572 | ||
1da177e4 LT |
573 | /* Does a already use b? */ |
574 | static int already_uses(struct module *a, struct module *b) | |
575 | { | |
576 | struct module_use *use; | |
577 | ||
2c02dfe7 LT |
578 | list_for_each_entry(use, &b->source_list, source_list) { |
579 | if (use->source == a) { | |
1da177e4 LT |
580 | DEBUGP("%s uses %s!\n", a->name, b->name); |
581 | return 1; | |
582 | } | |
583 | } | |
584 | DEBUGP("%s does not use %s!\n", a->name, b->name); | |
585 | return 0; | |
586 | } | |
587 | ||
2c02dfe7 LT |
588 | /* |
589 | * Module a uses b | |
590 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
591 | * - the module_use is added to the list of 'b' sources (so | |
592 | * 'b' can walk the list to see who sourced them), and of 'a' | |
593 | * targets (so 'a' can see what modules it targets). | |
594 | */ | |
595 | static int add_module_usage(struct module *a, struct module *b) | |
596 | { | |
2c02dfe7 LT |
597 | struct module_use *use; |
598 | ||
599 | DEBUGP("Allocating new usage for %s.\n", a->name); | |
600 | use = kmalloc(sizeof(*use), GFP_ATOMIC); | |
601 | if (!use) { | |
602 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
603 | return -ENOMEM; | |
604 | } | |
605 | ||
606 | use->source = a; | |
607 | use->target = b; | |
608 | list_add(&use->source_list, &b->source_list); | |
609 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
610 | return 0; |
611 | } | |
612 | ||
75676500 | 613 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 614 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 615 | { |
c8e21ced | 616 | int err; |
270a6c4c | 617 | |
9bea7f23 | 618 | if (b == NULL || already_uses(a, b)) |
218ce735 | 619 | return 0; |
218ce735 | 620 | |
9bea7f23 RR |
621 | /* If module isn't available, we fail. */ |
622 | err = strong_try_module_get(b); | |
c9a3ba55 | 623 | if (err) |
9bea7f23 | 624 | return err; |
1da177e4 | 625 | |
2c02dfe7 LT |
626 | err = add_module_usage(a, b); |
627 | if (err) { | |
1da177e4 | 628 | module_put(b); |
9bea7f23 | 629 | return err; |
1da177e4 | 630 | } |
9bea7f23 | 631 | return 0; |
1da177e4 | 632 | } |
9bea7f23 | 633 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
634 | |
635 | /* Clear the unload stuff of the module. */ | |
636 | static void module_unload_free(struct module *mod) | |
637 | { | |
2c02dfe7 | 638 | struct module_use *use, *tmp; |
1da177e4 | 639 | |
75676500 | 640 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
641 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
642 | struct module *i = use->target; | |
643 | DEBUGP("%s unusing %s\n", mod->name, i->name); | |
644 | module_put(i); | |
645 | list_del(&use->source_list); | |
646 | list_del(&use->target_list); | |
647 | kfree(use); | |
1da177e4 | 648 | } |
75676500 | 649 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
650 | |
651 | free_percpu(mod->refptr); | |
1da177e4 LT |
652 | } |
653 | ||
654 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 655 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
656 | { |
657 | int ret = (flags & O_TRUNC); | |
658 | if (ret) | |
fb169793 | 659 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
660 | return ret; |
661 | } | |
662 | #else | |
fb169793 | 663 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
664 | { |
665 | return 0; | |
666 | } | |
667 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
668 | ||
669 | struct stopref | |
670 | { | |
671 | struct module *mod; | |
672 | int flags; | |
673 | int *forced; | |
674 | }; | |
675 | ||
676 | /* Whole machine is stopped with interrupts off when this runs. */ | |
677 | static int __try_stop_module(void *_sref) | |
678 | { | |
679 | struct stopref *sref = _sref; | |
680 | ||
da39ba5e RR |
681 | /* If it's not unused, quit unless we're forcing. */ |
682 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 683 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
684 | return -EWOULDBLOCK; |
685 | } | |
686 | ||
687 | /* Mark it as dying. */ | |
688 | sref->mod->state = MODULE_STATE_GOING; | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
693 | { | |
da39ba5e RR |
694 | if (flags & O_NONBLOCK) { |
695 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 696 | |
9b1a4d38 | 697 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
698 | } else { |
699 | /* We don't need to stop the machine for this. */ | |
700 | mod->state = MODULE_STATE_GOING; | |
701 | synchronize_sched(); | |
702 | return 0; | |
703 | } | |
1da177e4 LT |
704 | } |
705 | ||
706 | unsigned int module_refcount(struct module *mod) | |
707 | { | |
5fbfb18d | 708 | unsigned int incs = 0, decs = 0; |
720eba31 | 709 | int cpu; |
1da177e4 | 710 | |
720eba31 | 711 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
712 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
713 | /* | |
714 | * ensure the incs are added up after the decs. | |
715 | * module_put ensures incs are visible before decs with smp_wmb. | |
716 | * | |
717 | * This 2-count scheme avoids the situation where the refcount | |
718 | * for CPU0 is read, then CPU0 increments the module refcount, | |
719 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
720 | * read. We would record a decrement but not its corresponding | |
721 | * increment so we would see a low count (disaster). | |
722 | * | |
723 | * Rare situation? But module_refcount can be preempted, and we | |
724 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
725 | */ | |
726 | smp_rmb(); | |
727 | for_each_possible_cpu(cpu) | |
728 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
729 | return incs - decs; | |
1da177e4 LT |
730 | } |
731 | EXPORT_SYMBOL(module_refcount); | |
732 | ||
733 | /* This exists whether we can unload or not */ | |
734 | static void free_module(struct module *mod); | |
735 | ||
736 | static void wait_for_zero_refcount(struct module *mod) | |
737 | { | |
a6550207 | 738 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 739 | mutex_unlock(&module_mutex); |
1da177e4 LT |
740 | for (;;) { |
741 | DEBUGP("Looking at refcount...\n"); | |
742 | set_current_state(TASK_UNINTERRUPTIBLE); | |
743 | if (module_refcount(mod) == 0) | |
744 | break; | |
745 | schedule(); | |
746 | } | |
747 | current->state = TASK_RUNNING; | |
6389a385 | 748 | mutex_lock(&module_mutex); |
1da177e4 LT |
749 | } |
750 | ||
17da2bd9 HC |
751 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
752 | unsigned int, flags) | |
1da177e4 LT |
753 | { |
754 | struct module *mod; | |
dfff0a06 | 755 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
756 | int ret, forced = 0; |
757 | ||
3d43321b | 758 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
759 | return -EPERM; |
760 | ||
761 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
762 | return -EFAULT; | |
763 | name[MODULE_NAME_LEN-1] = '\0'; | |
764 | ||
3fc1f1e2 TH |
765 | if (mutex_lock_interruptible(&module_mutex) != 0) |
766 | return -EINTR; | |
1da177e4 LT |
767 | |
768 | mod = find_module(name); | |
769 | if (!mod) { | |
770 | ret = -ENOENT; | |
771 | goto out; | |
772 | } | |
773 | ||
2c02dfe7 | 774 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
775 | /* Other modules depend on us: get rid of them first. */ |
776 | ret = -EWOULDBLOCK; | |
777 | goto out; | |
778 | } | |
779 | ||
780 | /* Doing init or already dying? */ | |
781 | if (mod->state != MODULE_STATE_LIVE) { | |
782 | /* FIXME: if (force), slam module count and wake up | |
783 | waiter --RR */ | |
784 | DEBUGP("%s already dying\n", mod->name); | |
785 | ret = -EBUSY; | |
786 | goto out; | |
787 | } | |
788 | ||
789 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 790 | if (mod->init && !mod->exit) { |
fb169793 | 791 | forced = try_force_unload(flags); |
1da177e4 LT |
792 | if (!forced) { |
793 | /* This module can't be removed */ | |
794 | ret = -EBUSY; | |
795 | goto out; | |
796 | } | |
797 | } | |
798 | ||
799 | /* Set this up before setting mod->state */ | |
800 | mod->waiter = current; | |
801 | ||
802 | /* Stop the machine so refcounts can't move and disable module. */ | |
803 | ret = try_stop_module(mod, flags, &forced); | |
804 | if (ret != 0) | |
805 | goto out; | |
806 | ||
807 | /* Never wait if forced. */ | |
808 | if (!forced && module_refcount(mod) != 0) | |
809 | wait_for_zero_refcount(mod); | |
810 | ||
df4b565e | 811 | mutex_unlock(&module_mutex); |
25985edc | 812 | /* Final destruction now no one is using it. */ |
df4b565e | 813 | if (mod->exit != NULL) |
1da177e4 | 814 | mod->exit(); |
df4b565e PO |
815 | blocking_notifier_call_chain(&module_notify_list, |
816 | MODULE_STATE_GOING, mod); | |
22a9d645 | 817 | async_synchronize_full(); |
75676500 | 818 | |
e14af7ee | 819 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 820 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 821 | |
75676500 RR |
822 | free_module(mod); |
823 | return 0; | |
824 | out: | |
6389a385 | 825 | mutex_unlock(&module_mutex); |
1da177e4 LT |
826 | return ret; |
827 | } | |
828 | ||
d1e99d7a | 829 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
830 | { |
831 | struct module_use *use; | |
832 | int printed_something = 0; | |
833 | ||
834 | seq_printf(m, " %u ", module_refcount(mod)); | |
835 | ||
836 | /* Always include a trailing , so userspace can differentiate | |
837 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 838 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 839 | printed_something = 1; |
2c02dfe7 | 840 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
841 | } |
842 | ||
1da177e4 LT |
843 | if (mod->init != NULL && mod->exit == NULL) { |
844 | printed_something = 1; | |
845 | seq_printf(m, "[permanent],"); | |
846 | } | |
847 | ||
848 | if (!printed_something) | |
849 | seq_printf(m, "-"); | |
850 | } | |
851 | ||
852 | void __symbol_put(const char *symbol) | |
853 | { | |
854 | struct module *owner; | |
1da177e4 | 855 | |
24da1cbf | 856 | preempt_disable(); |
414fd31b | 857 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
858 | BUG(); |
859 | module_put(owner); | |
24da1cbf | 860 | preempt_enable(); |
1da177e4 LT |
861 | } |
862 | EXPORT_SYMBOL(__symbol_put); | |
863 | ||
7d1d16e4 | 864 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
865 | void symbol_put_addr(void *addr) |
866 | { | |
5e376613 | 867 | struct module *modaddr; |
7d1d16e4 | 868 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 869 | |
7d1d16e4 | 870 | if (core_kernel_text(a)) |
5e376613 | 871 | return; |
1da177e4 | 872 | |
a6e6abd5 RR |
873 | /* module_text_address is safe here: we're supposed to have reference |
874 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 875 | modaddr = __module_text_address(a); |
a6e6abd5 | 876 | BUG_ON(!modaddr); |
5e376613 | 877 | module_put(modaddr); |
1da177e4 LT |
878 | } |
879 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
880 | ||
881 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
882 | struct module *mod, char *buffer) | |
883 | { | |
256e2fdf | 884 | return sprintf(buffer, "%u\n", module_refcount(mod)); |
1da177e4 LT |
885 | } |
886 | ||
887 | static struct module_attribute refcnt = { | |
7b595756 | 888 | .attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4 LT |
889 | .show = show_refcnt, |
890 | }; | |
891 | ||
f6a57033 AV |
892 | void module_put(struct module *module) |
893 | { | |
894 | if (module) { | |
e1783a24 | 895 | preempt_disable(); |
5fbfb18d NP |
896 | smp_wmb(); /* see comment in module_refcount */ |
897 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 898 | |
ae832d1e | 899 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
900 | /* Maybe they're waiting for us to drop reference? */ |
901 | if (unlikely(!module_is_live(module))) | |
902 | wake_up_process(module->waiter); | |
e1783a24 | 903 | preempt_enable(); |
f6a57033 AV |
904 | } |
905 | } | |
906 | EXPORT_SYMBOL(module_put); | |
907 | ||
1da177e4 | 908 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 909 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
910 | { |
911 | /* We don't know the usage count, or what modules are using. */ | |
912 | seq_printf(m, " - -"); | |
913 | } | |
914 | ||
915 | static inline void module_unload_free(struct module *mod) | |
916 | { | |
917 | } | |
918 | ||
9bea7f23 | 919 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 920 | { |
9bea7f23 | 921 | return strong_try_module_get(b); |
1da177e4 | 922 | } |
9bea7f23 | 923 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 924 | |
9f85a4bb | 925 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 926 | { |
9f85a4bb | 927 | return 0; |
1da177e4 LT |
928 | } |
929 | #endif /* CONFIG_MODULE_UNLOAD */ | |
930 | ||
1f71740a KS |
931 | static ssize_t show_initstate(struct module_attribute *mattr, |
932 | struct module *mod, char *buffer) | |
933 | { | |
934 | const char *state = "unknown"; | |
935 | ||
936 | switch (mod->state) { | |
937 | case MODULE_STATE_LIVE: | |
938 | state = "live"; | |
939 | break; | |
940 | case MODULE_STATE_COMING: | |
941 | state = "coming"; | |
942 | break; | |
943 | case MODULE_STATE_GOING: | |
944 | state = "going"; | |
945 | break; | |
946 | } | |
947 | return sprintf(buffer, "%s\n", state); | |
948 | } | |
949 | ||
950 | static struct module_attribute initstate = { | |
7b595756 | 951 | .attr = { .name = "initstate", .mode = 0444 }, |
1f71740a KS |
952 | .show = show_initstate, |
953 | }; | |
954 | ||
03e88ae1 GKH |
955 | static struct module_attribute *modinfo_attrs[] = { |
956 | &modinfo_version, | |
957 | &modinfo_srcversion, | |
1f71740a | 958 | &initstate, |
03e88ae1 GKH |
959 | #ifdef CONFIG_MODULE_UNLOAD |
960 | &refcnt, | |
961 | #endif | |
962 | NULL, | |
963 | }; | |
964 | ||
1da177e4 LT |
965 | static const char vermagic[] = VERMAGIC_STRING; |
966 | ||
c6e665c8 | 967 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
968 | { |
969 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 970 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
971 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
972 | mod->name, reason); | |
826e4506 LT |
973 | add_taint_module(mod, TAINT_FORCED_MODULE); |
974 | return 0; | |
975 | #else | |
976 | return -ENOEXEC; | |
977 | #endif | |
978 | } | |
979 | ||
1da177e4 | 980 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
981 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
982 | static unsigned long maybe_relocated(unsigned long crc, | |
983 | const struct module *crc_owner) | |
984 | { | |
985 | #ifdef ARCH_RELOCATES_KCRCTAB | |
986 | if (crc_owner == NULL) | |
987 | return crc - (unsigned long)reloc_start; | |
988 | #endif | |
989 | return crc; | |
990 | } | |
991 | ||
1da177e4 LT |
992 | static int check_version(Elf_Shdr *sechdrs, |
993 | unsigned int versindex, | |
994 | const char *symname, | |
995 | struct module *mod, | |
d4703aef RR |
996 | const unsigned long *crc, |
997 | const struct module *crc_owner) | |
1da177e4 LT |
998 | { |
999 | unsigned int i, num_versions; | |
1000 | struct modversion_info *versions; | |
1001 | ||
1002 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1003 | if (!crc) | |
1004 | return 1; | |
1005 | ||
a5dd6970 RR |
1006 | /* No versions at all? modprobe --force does this. */ |
1007 | if (versindex == 0) | |
1008 | return try_to_force_load(mod, symname) == 0; | |
1009 | ||
1da177e4 LT |
1010 | versions = (void *) sechdrs[versindex].sh_addr; |
1011 | num_versions = sechdrs[versindex].sh_size | |
1012 | / sizeof(struct modversion_info); | |
1013 | ||
1014 | for (i = 0; i < num_versions; i++) { | |
1015 | if (strcmp(versions[i].name, symname) != 0) | |
1016 | continue; | |
1017 | ||
d4703aef | 1018 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1019 | return 1; |
1da177e4 | 1020 | DEBUGP("Found checksum %lX vs module %lX\n", |
d4703aef | 1021 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1022 | goto bad_version; |
1da177e4 | 1023 | } |
826e4506 | 1024 | |
a5dd6970 RR |
1025 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1026 | mod->name, symname); | |
1027 | return 0; | |
826e4506 LT |
1028 | |
1029 | bad_version: | |
1030 | printk("%s: disagrees about version of symbol %s\n", | |
1031 | mod->name, symname); | |
1032 | return 0; | |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1036 | unsigned int versindex, | |
1037 | struct module *mod) | |
1038 | { | |
1039 | const unsigned long *crc; | |
1da177e4 | 1040 | |
75676500 RR |
1041 | /* Since this should be found in kernel (which can't be removed), |
1042 | * no locking is necessary. */ | |
6560dc16 MF |
1043 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1044 | &crc, true, false)) | |
1da177e4 | 1045 | BUG(); |
d4703aef RR |
1046 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1047 | NULL); | |
1da177e4 LT |
1048 | } |
1049 | ||
91e37a79 RR |
1050 | /* First part is kernel version, which we ignore if module has crcs. */ |
1051 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1052 | bool has_crcs) | |
1da177e4 | 1053 | { |
91e37a79 RR |
1054 | if (has_crcs) { |
1055 | amagic += strcspn(amagic, " "); | |
1056 | bmagic += strcspn(bmagic, " "); | |
1057 | } | |
1da177e4 LT |
1058 | return strcmp(amagic, bmagic) == 0; |
1059 | } | |
1060 | #else | |
1061 | static inline int check_version(Elf_Shdr *sechdrs, | |
1062 | unsigned int versindex, | |
1063 | const char *symname, | |
1064 | struct module *mod, | |
d4703aef RR |
1065 | const unsigned long *crc, |
1066 | const struct module *crc_owner) | |
1da177e4 LT |
1067 | { |
1068 | return 1; | |
1069 | } | |
1070 | ||
1071 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1072 | unsigned int versindex, | |
1073 | struct module *mod) | |
1074 | { | |
1075 | return 1; | |
1076 | } | |
1077 | ||
91e37a79 RR |
1078 | static inline int same_magic(const char *amagic, const char *bmagic, |
1079 | bool has_crcs) | |
1da177e4 LT |
1080 | { |
1081 | return strcmp(amagic, bmagic) == 0; | |
1082 | } | |
1083 | #endif /* CONFIG_MODVERSIONS */ | |
1084 | ||
75676500 | 1085 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1086 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1087 | const struct load_info *info, | |
414fd31b | 1088 | const char *name, |
9bea7f23 | 1089 | char ownername[]) |
1da177e4 LT |
1090 | { |
1091 | struct module *owner; | |
414fd31b | 1092 | const struct kernel_symbol *sym; |
1da177e4 | 1093 | const unsigned long *crc; |
9bea7f23 | 1094 | int err; |
1da177e4 | 1095 | |
75676500 | 1096 | mutex_lock(&module_mutex); |
414fd31b | 1097 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1098 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1099 | if (!sym) |
1100 | goto unlock; | |
1101 | ||
49668688 RR |
1102 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1103 | owner)) { | |
9bea7f23 RR |
1104 | sym = ERR_PTR(-EINVAL); |
1105 | goto getname; | |
1da177e4 | 1106 | } |
9bea7f23 RR |
1107 | |
1108 | err = ref_module(mod, owner); | |
1109 | if (err) { | |
1110 | sym = ERR_PTR(err); | |
1111 | goto getname; | |
1112 | } | |
1113 | ||
1114 | getname: | |
1115 | /* We must make copy under the lock if we failed to get ref. */ | |
1116 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1117 | unlock: | |
75676500 | 1118 | mutex_unlock(&module_mutex); |
218ce735 | 1119 | return sym; |
1da177e4 LT |
1120 | } |
1121 | ||
49668688 RR |
1122 | static const struct kernel_symbol * |
1123 | resolve_symbol_wait(struct module *mod, | |
1124 | const struct load_info *info, | |
1125 | const char *name) | |
9bea7f23 RR |
1126 | { |
1127 | const struct kernel_symbol *ksym; | |
49668688 | 1128 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1129 | |
1130 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1131 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1132 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 RR |
1133 | 30 * HZ) <= 0) { |
1134 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
49668688 | 1135 | mod->name, owner); |
9bea7f23 RR |
1136 | } |
1137 | return ksym; | |
1138 | } | |
1139 | ||
1da177e4 LT |
1140 | /* |
1141 | * /sys/module/foo/sections stuff | |
1142 | * J. Corbet <corbet@lwn.net> | |
1143 | */ | |
8f6d0378 | 1144 | #ifdef CONFIG_SYSFS |
10b465aa | 1145 | |
8f6d0378 | 1146 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1147 | static inline bool sect_empty(const Elf_Shdr *sect) |
1148 | { | |
1149 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1150 | } | |
1151 | ||
a58730c4 RR |
1152 | struct module_sect_attr |
1153 | { | |
1154 | struct module_attribute mattr; | |
1155 | char *name; | |
1156 | unsigned long address; | |
1157 | }; | |
1158 | ||
1159 | struct module_sect_attrs | |
1160 | { | |
1161 | struct attribute_group grp; | |
1162 | unsigned int nsections; | |
1163 | struct module_sect_attr attrs[0]; | |
1164 | }; | |
1165 | ||
1da177e4 LT |
1166 | static ssize_t module_sect_show(struct module_attribute *mattr, |
1167 | struct module *mod, char *buf) | |
1168 | { | |
1169 | struct module_sect_attr *sattr = | |
1170 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1171 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1172 | } |
1173 | ||
04b1db9f IN |
1174 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1175 | { | |
a58730c4 | 1176 | unsigned int section; |
04b1db9f IN |
1177 | |
1178 | for (section = 0; section < sect_attrs->nsections; section++) | |
1179 | kfree(sect_attrs->attrs[section].name); | |
1180 | kfree(sect_attrs); | |
1181 | } | |
1182 | ||
8f6d0378 | 1183 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1184 | { |
1185 | unsigned int nloaded = 0, i, size[2]; | |
1186 | struct module_sect_attrs *sect_attrs; | |
1187 | struct module_sect_attr *sattr; | |
1188 | struct attribute **gattr; | |
22a8bdeb | 1189 | |
1da177e4 | 1190 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1191 | for (i = 0; i < info->hdr->e_shnum; i++) |
1192 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1193 | nloaded++; |
1194 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1195 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1196 | sizeof(sect_attrs->grp.attrs[0])); | |
1197 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1198 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1199 | if (sect_attrs == NULL) | |
1da177e4 LT |
1200 | return; |
1201 | ||
1202 | /* Setup section attributes. */ | |
1203 | sect_attrs->grp.name = "sections"; | |
1204 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1205 | ||
04b1db9f | 1206 | sect_attrs->nsections = 0; |
1da177e4 LT |
1207 | sattr = §_attrs->attrs[0]; |
1208 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1209 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1210 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1211 | if (sect_empty(sec)) | |
35dead42 | 1212 | continue; |
8f6d0378 RR |
1213 | sattr->address = sec->sh_addr; |
1214 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1215 | GFP_KERNEL); |
1216 | if (sattr->name == NULL) | |
1217 | goto out; | |
1218 | sect_attrs->nsections++; | |
361795b1 | 1219 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1220 | sattr->mattr.show = module_sect_show; |
1221 | sattr->mattr.store = NULL; | |
1222 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1223 | sattr->mattr.attr.mode = S_IRUGO; |
1224 | *(gattr++) = &(sattr++)->mattr.attr; | |
1225 | } | |
1226 | *gattr = NULL; | |
1227 | ||
1228 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1229 | goto out; | |
1230 | ||
1231 | mod->sect_attrs = sect_attrs; | |
1232 | return; | |
1233 | out: | |
04b1db9f | 1234 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | static void remove_sect_attrs(struct module *mod) | |
1238 | { | |
1239 | if (mod->sect_attrs) { | |
1240 | sysfs_remove_group(&mod->mkobj.kobj, | |
1241 | &mod->sect_attrs->grp); | |
1242 | /* We are positive that no one is using any sect attrs | |
1243 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1244 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1245 | mod->sect_attrs = NULL; |
1246 | } | |
1247 | } | |
1248 | ||
6d760133 RM |
1249 | /* |
1250 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1251 | */ | |
1252 | ||
1253 | struct module_notes_attrs { | |
1254 | struct kobject *dir; | |
1255 | unsigned int notes; | |
1256 | struct bin_attribute attrs[0]; | |
1257 | }; | |
1258 | ||
2c3c8bea | 1259 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1260 | struct bin_attribute *bin_attr, |
1261 | char *buf, loff_t pos, size_t count) | |
1262 | { | |
1263 | /* | |
1264 | * The caller checked the pos and count against our size. | |
1265 | */ | |
1266 | memcpy(buf, bin_attr->private + pos, count); | |
1267 | return count; | |
1268 | } | |
1269 | ||
1270 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1271 | unsigned int i) | |
1272 | { | |
1273 | if (notes_attrs->dir) { | |
1274 | while (i-- > 0) | |
1275 | sysfs_remove_bin_file(notes_attrs->dir, | |
1276 | ¬es_attrs->attrs[i]); | |
e9432093 | 1277 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1278 | } |
1279 | kfree(notes_attrs); | |
1280 | } | |
1281 | ||
8f6d0378 | 1282 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1283 | { |
1284 | unsigned int notes, loaded, i; | |
1285 | struct module_notes_attrs *notes_attrs; | |
1286 | struct bin_attribute *nattr; | |
1287 | ||
ea6bff36 IM |
1288 | /* failed to create section attributes, so can't create notes */ |
1289 | if (!mod->sect_attrs) | |
1290 | return; | |
1291 | ||
6d760133 RM |
1292 | /* Count notes sections and allocate structures. */ |
1293 | notes = 0; | |
8f6d0378 RR |
1294 | for (i = 0; i < info->hdr->e_shnum; i++) |
1295 | if (!sect_empty(&info->sechdrs[i]) && | |
1296 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1297 | ++notes; |
1298 | ||
1299 | if (notes == 0) | |
1300 | return; | |
1301 | ||
1302 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1303 | + notes * sizeof(notes_attrs->attrs[0]), | |
1304 | GFP_KERNEL); | |
1305 | if (notes_attrs == NULL) | |
1306 | return; | |
1307 | ||
1308 | notes_attrs->notes = notes; | |
1309 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1310 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1311 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1312 | continue; |
8f6d0378 | 1313 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1314 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1315 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1316 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1317 | nattr->size = info->sechdrs[i].sh_size; |
1318 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1319 | nattr->read = module_notes_read; |
1320 | ++nattr; | |
1321 | } | |
1322 | ++loaded; | |
1323 | } | |
1324 | ||
4ff6abff | 1325 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1326 | if (!notes_attrs->dir) |
1327 | goto out; | |
1328 | ||
1329 | for (i = 0; i < notes; ++i) | |
1330 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1331 | ¬es_attrs->attrs[i])) | |
1332 | goto out; | |
1333 | ||
1334 | mod->notes_attrs = notes_attrs; | |
1335 | return; | |
1336 | ||
1337 | out: | |
1338 | free_notes_attrs(notes_attrs, i); | |
1339 | } | |
1340 | ||
1341 | static void remove_notes_attrs(struct module *mod) | |
1342 | { | |
1343 | if (mod->notes_attrs) | |
1344 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1345 | } | |
1346 | ||
1da177e4 | 1347 | #else |
04b1db9f | 1348 | |
8f6d0378 RR |
1349 | static inline void add_sect_attrs(struct module *mod, |
1350 | const struct load_info *info) | |
1da177e4 LT |
1351 | { |
1352 | } | |
1353 | ||
1354 | static inline void remove_sect_attrs(struct module *mod) | |
1355 | { | |
1356 | } | |
6d760133 | 1357 | |
8f6d0378 RR |
1358 | static inline void add_notes_attrs(struct module *mod, |
1359 | const struct load_info *info) | |
6d760133 RM |
1360 | { |
1361 | } | |
1362 | ||
1363 | static inline void remove_notes_attrs(struct module *mod) | |
1364 | { | |
1365 | } | |
8f6d0378 | 1366 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1367 | |
80a3d1bb RR |
1368 | static void add_usage_links(struct module *mod) |
1369 | { | |
1370 | #ifdef CONFIG_MODULE_UNLOAD | |
1371 | struct module_use *use; | |
1372 | int nowarn; | |
1373 | ||
75676500 | 1374 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1375 | list_for_each_entry(use, &mod->target_list, target_list) { |
1376 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1377 | &mod->mkobj.kobj, mod->name); | |
1378 | } | |
75676500 | 1379 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1380 | #endif |
1381 | } | |
1382 | ||
1383 | static void del_usage_links(struct module *mod) | |
1384 | { | |
1385 | #ifdef CONFIG_MODULE_UNLOAD | |
1386 | struct module_use *use; | |
1387 | ||
75676500 | 1388 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1389 | list_for_each_entry(use, &mod->target_list, target_list) |
1390 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1391 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1392 | #endif |
1393 | } | |
1394 | ||
6407ebb2 | 1395 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1396 | { |
1397 | struct module_attribute *attr; | |
03e88ae1 | 1398 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1399 | int error = 0; |
1400 | int i; | |
1401 | ||
03e88ae1 GKH |
1402 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1403 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1404 | GFP_KERNEL); | |
1405 | if (!mod->modinfo_attrs) | |
1406 | return -ENOMEM; | |
1407 | ||
1408 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1409 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1410 | if (!attr->test || | |
03e88ae1 GKH |
1411 | (attr->test && attr->test(mod))) { |
1412 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1413 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1414 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1415 | ++temp_attr; | |
1416 | } | |
c988d2b2 MD |
1417 | } |
1418 | return error; | |
1419 | } | |
1420 | ||
6407ebb2 | 1421 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1422 | { |
1423 | struct module_attribute *attr; | |
1424 | int i; | |
1425 | ||
03e88ae1 GKH |
1426 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1427 | /* pick a field to test for end of list */ | |
1428 | if (!attr->attr.name) | |
1429 | break; | |
c988d2b2 | 1430 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1431 | if (attr->free) |
1432 | attr->free(mod); | |
c988d2b2 | 1433 | } |
03e88ae1 | 1434 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1435 | } |
1da177e4 | 1436 | |
6407ebb2 | 1437 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1438 | { |
1439 | int err; | |
6494a93d | 1440 | struct kobject *kobj; |
1da177e4 | 1441 | |
823bccfc GKH |
1442 | if (!module_sysfs_initialized) { |
1443 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1444 | mod->name); |
1445 | err = -EINVAL; | |
1446 | goto out; | |
1447 | } | |
6494a93d GKH |
1448 | |
1449 | kobj = kset_find_obj(module_kset, mod->name); | |
1450 | if (kobj) { | |
1451 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1452 | kobject_put(kobj); | |
1453 | err = -EINVAL; | |
1454 | goto out; | |
1455 | } | |
1456 | ||
1da177e4 | 1457 | mod->mkobj.mod = mod; |
e17e0f51 | 1458 | |
ac3c8141 GKH |
1459 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1460 | mod->mkobj.kobj.kset = module_kset; | |
1461 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1462 | "%s", mod->name); | |
1463 | if (err) | |
1464 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1465 | |
97c146ef | 1466 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1467 | out: |
1468 | return err; | |
1469 | } | |
1470 | ||
6407ebb2 | 1471 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1472 | const struct load_info *info, |
270a6c4c KS |
1473 | struct kernel_param *kparam, |
1474 | unsigned int num_params) | |
1475 | { | |
1476 | int err; | |
1477 | ||
80a3d1bb RR |
1478 | err = mod_sysfs_init(mod); |
1479 | if (err) | |
1480 | goto out; | |
1481 | ||
4ff6abff | 1482 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1483 | if (!mod->holders_dir) { |
1484 | err = -ENOMEM; | |
270a6c4c | 1485 | goto out_unreg; |
240936e1 | 1486 | } |
270a6c4c | 1487 | |
1da177e4 LT |
1488 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1489 | if (err) | |
270a6c4c | 1490 | goto out_unreg_holders; |
1da177e4 | 1491 | |
c988d2b2 MD |
1492 | err = module_add_modinfo_attrs(mod); |
1493 | if (err) | |
e17e0f51 | 1494 | goto out_unreg_param; |
c988d2b2 | 1495 | |
80a3d1bb | 1496 | add_usage_links(mod); |
8f6d0378 RR |
1497 | add_sect_attrs(mod, info); |
1498 | add_notes_attrs(mod, info); | |
80a3d1bb | 1499 | |
e17e0f51 | 1500 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1501 | return 0; |
1502 | ||
e17e0f51 KS |
1503 | out_unreg_param: |
1504 | module_param_sysfs_remove(mod); | |
270a6c4c | 1505 | out_unreg_holders: |
78a2d906 | 1506 | kobject_put(mod->holders_dir); |
270a6c4c | 1507 | out_unreg: |
e17e0f51 | 1508 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1509 | out: |
1da177e4 LT |
1510 | return err; |
1511 | } | |
34e4e2fe DL |
1512 | |
1513 | static void mod_sysfs_fini(struct module *mod) | |
1514 | { | |
8f6d0378 RR |
1515 | remove_notes_attrs(mod); |
1516 | remove_sect_attrs(mod); | |
34e4e2fe DL |
1517 | kobject_put(&mod->mkobj.kobj); |
1518 | } | |
1519 | ||
8f6d0378 | 1520 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1521 | |
8f6d0378 RR |
1522 | static int mod_sysfs_setup(struct module *mod, |
1523 | const struct load_info *info, | |
6407ebb2 RR |
1524 | struct kernel_param *kparam, |
1525 | unsigned int num_params) | |
1526 | { | |
1527 | return 0; | |
1528 | } | |
1529 | ||
34e4e2fe DL |
1530 | static void mod_sysfs_fini(struct module *mod) |
1531 | { | |
1532 | } | |
1533 | ||
36b0360d RR |
1534 | static void module_remove_modinfo_attrs(struct module *mod) |
1535 | { | |
1536 | } | |
1537 | ||
80a3d1bb RR |
1538 | static void del_usage_links(struct module *mod) |
1539 | { | |
1540 | } | |
1541 | ||
34e4e2fe | 1542 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1543 | |
36b0360d | 1544 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1545 | { |
80a3d1bb | 1546 | del_usage_links(mod); |
c988d2b2 | 1547 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1548 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1549 | kobject_put(mod->mkobj.drivers_dir); |
1550 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1551 | mod_sysfs_fini(mod); |
1da177e4 LT |
1552 | } |
1553 | ||
1554 | /* | |
1555 | * unlink the module with the whole machine is stopped with interrupts off | |
1556 | * - this defends against kallsyms not taking locks | |
1557 | */ | |
1558 | static int __unlink_module(void *_mod) | |
1559 | { | |
1560 | struct module *mod = _mod; | |
1561 | list_del(&mod->list); | |
5336377d | 1562 | module_bug_cleanup(mod); |
1da177e4 LT |
1563 | return 0; |
1564 | } | |
1565 | ||
84e1c6bb MC |
1566 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1567 | /* | |
1568 | * LKM RO/NX protection: protect module's text/ro-data | |
1569 | * from modification and any data from execution. | |
1570 | */ | |
1571 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1572 | { | |
1573 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1574 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1575 | ||
1576 | if (end_pfn > begin_pfn) | |
1577 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1578 | } | |
1579 | ||
1580 | static void set_section_ro_nx(void *base, | |
1581 | unsigned long text_size, | |
1582 | unsigned long ro_size, | |
1583 | unsigned long total_size) | |
1584 | { | |
1585 | /* begin and end PFNs of the current subsection */ | |
1586 | unsigned long begin_pfn; | |
1587 | unsigned long end_pfn; | |
1588 | ||
1589 | /* | |
1590 | * Set RO for module text and RO-data: | |
1591 | * - Always protect first page. | |
1592 | * - Do not protect last partial page. | |
1593 | */ | |
1594 | if (ro_size > 0) | |
1595 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1596 | ||
1597 | /* | |
1598 | * Set NX permissions for module data: | |
1599 | * - Do not protect first partial page. | |
1600 | * - Always protect last page. | |
1601 | */ | |
1602 | if (total_size > text_size) { | |
1603 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1604 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1605 | if (end_pfn > begin_pfn) | |
1606 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1607 | } | |
1608 | } | |
1609 | ||
448694a1 | 1610 | /* Setting memory back to W+X before releasing it */ |
84e1c6bb MC |
1611 | void unset_section_ro_nx(struct module *mod, void *module_region) |
1612 | { | |
84e1c6bb | 1613 | if (mod->module_core == module_region) { |
448694a1 JG |
1614 | set_page_attributes(mod->module_core + mod->core_text_size, |
1615 | mod->module_core + mod->core_size, | |
1616 | set_memory_x); | |
1617 | set_page_attributes(mod->module_core, | |
1618 | mod->module_core + mod->core_ro_size, | |
1619 | set_memory_rw); | |
84e1c6bb | 1620 | } else if (mod->module_init == module_region) { |
448694a1 JG |
1621 | set_page_attributes(mod->module_init + mod->init_text_size, |
1622 | mod->module_init + mod->init_size, | |
1623 | set_memory_x); | |
1624 | set_page_attributes(mod->module_init, | |
1625 | mod->module_init + mod->init_ro_size, | |
1626 | set_memory_rw); | |
84e1c6bb MC |
1627 | } |
1628 | } | |
1629 | ||
1630 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1631 | void set_all_modules_text_rw(void) |
84e1c6bb MC |
1632 | { |
1633 | struct module *mod; | |
1634 | ||
1635 | mutex_lock(&module_mutex); | |
1636 | list_for_each_entry_rcu(mod, &modules, list) { | |
1637 | if ((mod->module_core) && (mod->core_text_size)) { | |
1638 | set_page_attributes(mod->module_core, | |
1639 | mod->module_core + mod->core_text_size, | |
1640 | set_memory_rw); | |
1641 | } | |
1642 | if ((mod->module_init) && (mod->init_text_size)) { | |
1643 | set_page_attributes(mod->module_init, | |
1644 | mod->module_init + mod->init_text_size, | |
1645 | set_memory_rw); | |
1646 | } | |
1647 | } | |
1648 | mutex_unlock(&module_mutex); | |
1649 | } | |
1650 | ||
1651 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1652 | void set_all_modules_text_ro(void) |
84e1c6bb MC |
1653 | { |
1654 | struct module *mod; | |
1655 | ||
1656 | mutex_lock(&module_mutex); | |
1657 | list_for_each_entry_rcu(mod, &modules, list) { | |
1658 | if ((mod->module_core) && (mod->core_text_size)) { | |
1659 | set_page_attributes(mod->module_core, | |
1660 | mod->module_core + mod->core_text_size, | |
1661 | set_memory_ro); | |
1662 | } | |
1663 | if ((mod->module_init) && (mod->init_text_size)) { | |
1664 | set_page_attributes(mod->module_init, | |
1665 | mod->module_init + mod->init_text_size, | |
1666 | set_memory_ro); | |
1667 | } | |
1668 | } | |
1669 | mutex_unlock(&module_mutex); | |
1670 | } | |
1671 | #else | |
1672 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
1673 | static inline void unset_section_ro_nx(struct module *mod, void *module_region) { } | |
1674 | #endif | |
1675 | ||
75676500 | 1676 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1677 | static void free_module(struct module *mod) |
1678 | { | |
7ead8b83 LZ |
1679 | trace_module_free(mod); |
1680 | ||
1da177e4 | 1681 | /* Delete from various lists */ |
75676500 | 1682 | mutex_lock(&module_mutex); |
9b1a4d38 | 1683 | stop_machine(__unlink_module, mod, NULL); |
75676500 | 1684 | mutex_unlock(&module_mutex); |
36b0360d | 1685 | mod_sysfs_teardown(mod); |
1da177e4 | 1686 | |
b82bab4b JB |
1687 | /* Remove dynamic debug info */ |
1688 | ddebug_remove_module(mod->name); | |
1689 | ||
1da177e4 LT |
1690 | /* Arch-specific cleanup. */ |
1691 | module_arch_cleanup(mod); | |
1692 | ||
1693 | /* Module unload stuff */ | |
1694 | module_unload_free(mod); | |
1695 | ||
e180a6b7 RR |
1696 | /* Free any allocated parameters. */ |
1697 | destroy_params(mod->kp, mod->num_kp); | |
1698 | ||
1da177e4 | 1699 | /* This may be NULL, but that's OK */ |
84e1c6bb | 1700 | unset_section_ro_nx(mod, mod->module_init); |
1da177e4 LT |
1701 | module_free(mod, mod->module_init); |
1702 | kfree(mod->args); | |
259354de | 1703 | percpu_modfree(mod); |
9f85a4bb | 1704 | |
fbb9ce95 IM |
1705 | /* Free lock-classes: */ |
1706 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1707 | ||
1da177e4 | 1708 | /* Finally, free the core (containing the module structure) */ |
84e1c6bb | 1709 | unset_section_ro_nx(mod, mod->module_core); |
1da177e4 | 1710 | module_free(mod, mod->module_core); |
eb8cdec4 BS |
1711 | |
1712 | #ifdef CONFIG_MPU | |
1713 | update_protections(current->mm); | |
1714 | #endif | |
1da177e4 LT |
1715 | } |
1716 | ||
1717 | void *__symbol_get(const char *symbol) | |
1718 | { | |
1719 | struct module *owner; | |
414fd31b | 1720 | const struct kernel_symbol *sym; |
1da177e4 | 1721 | |
24da1cbf | 1722 | preempt_disable(); |
414fd31b TA |
1723 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1724 | if (sym && strong_try_module_get(owner)) | |
1725 | sym = NULL; | |
24da1cbf | 1726 | preempt_enable(); |
1da177e4 | 1727 | |
414fd31b | 1728 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1729 | } |
1730 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1731 | ||
eea8b54d AN |
1732 | /* |
1733 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1734 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1735 | * |
1736 | * You must hold the module_mutex. | |
eea8b54d AN |
1737 | */ |
1738 | static int verify_export_symbols(struct module *mod) | |
1739 | { | |
b211104d | 1740 | unsigned int i; |
eea8b54d | 1741 | struct module *owner; |
b211104d RR |
1742 | const struct kernel_symbol *s; |
1743 | struct { | |
1744 | const struct kernel_symbol *sym; | |
1745 | unsigned int num; | |
1746 | } arr[] = { | |
1747 | { mod->syms, mod->num_syms }, | |
1748 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1749 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1750 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1751 | { mod->unused_syms, mod->num_unused_syms }, |
1752 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1753 | #endif |
b211104d | 1754 | }; |
eea8b54d | 1755 | |
b211104d RR |
1756 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1757 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1758 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1759 | printk(KERN_ERR |
1760 | "%s: exports duplicate symbol %s" | |
1761 | " (owned by %s)\n", | |
1762 | mod->name, s->name, module_name(owner)); | |
1763 | return -ENOEXEC; | |
1764 | } | |
eea8b54d | 1765 | } |
b211104d RR |
1766 | } |
1767 | return 0; | |
eea8b54d AN |
1768 | } |
1769 | ||
9a4b9708 | 1770 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1771 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1772 | { | |
1773 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1774 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1775 | unsigned long secbase; |
49668688 | 1776 | unsigned int i; |
1da177e4 | 1777 | int ret = 0; |
414fd31b | 1778 | const struct kernel_symbol *ksym; |
1da177e4 | 1779 | |
49668688 RR |
1780 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1781 | const char *name = info->strtab + sym[i].st_name; | |
1782 | ||
1da177e4 LT |
1783 | switch (sym[i].st_shndx) { |
1784 | case SHN_COMMON: | |
1785 | /* We compiled with -fno-common. These are not | |
1786 | supposed to happen. */ | |
49668688 | 1787 | DEBUGP("Common symbol: %s\n", name); |
1da177e4 LT |
1788 | printk("%s: please compile with -fno-common\n", |
1789 | mod->name); | |
1790 | ret = -ENOEXEC; | |
1791 | break; | |
1792 | ||
1793 | case SHN_ABS: | |
1794 | /* Don't need to do anything */ | |
1795 | DEBUGP("Absolute symbol: 0x%08lx\n", | |
1796 | (long)sym[i].st_value); | |
1797 | break; | |
1798 | ||
1799 | case SHN_UNDEF: | |
49668688 | 1800 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1801 | /* Ok if resolved. */ |
9bea7f23 | 1802 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1803 | sym[i].st_value = ksym->value; |
1da177e4 | 1804 | break; |
414fd31b TA |
1805 | } |
1806 | ||
1da177e4 | 1807 | /* Ok if weak. */ |
9bea7f23 | 1808 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1809 | break; |
1810 | ||
9bea7f23 | 1811 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
49668688 | 1812 | mod->name, name, PTR_ERR(ksym)); |
9bea7f23 | 1813 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
1814 | break; |
1815 | ||
1816 | default: | |
1817 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 1818 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 1819 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 1820 | else |
49668688 | 1821 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
1822 | sym[i].st_value += secbase; |
1823 | break; | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | return ret; | |
1828 | } | |
1829 | ||
49668688 | 1830 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
1831 | { |
1832 | unsigned int i; | |
1833 | int err = 0; | |
1834 | ||
1835 | /* Now do relocations. */ | |
49668688 RR |
1836 | for (i = 1; i < info->hdr->e_shnum; i++) { |
1837 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
1838 | |
1839 | /* Not a valid relocation section? */ | |
49668688 | 1840 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
1841 | continue; |
1842 | ||
1843 | /* Don't bother with non-allocated sections */ | |
49668688 | 1844 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
1845 | continue; |
1846 | ||
49668688 RR |
1847 | if (info->sechdrs[i].sh_type == SHT_REL) |
1848 | err = apply_relocate(info->sechdrs, info->strtab, | |
1849 | info->index.sym, i, mod); | |
1850 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
1851 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
1852 | info->index.sym, i, mod); | |
22e268eb RR |
1853 | if (err < 0) |
1854 | break; | |
1855 | } | |
1856 | return err; | |
1857 | } | |
1858 | ||
088af9a6 HD |
1859 | /* Additional bytes needed by arch in front of individual sections */ |
1860 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
1861 | unsigned int section) | |
1862 | { | |
1863 | /* default implementation just returns zero */ | |
1864 | return 0; | |
1865 | } | |
1866 | ||
1da177e4 | 1867 | /* Update size with this section: return offset. */ |
088af9a6 HD |
1868 | static long get_offset(struct module *mod, unsigned int *size, |
1869 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
1870 | { |
1871 | long ret; | |
1872 | ||
088af9a6 | 1873 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
1874 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
1875 | *size = ret + sechdr->sh_size; | |
1876 | return ret; | |
1877 | } | |
1878 | ||
1879 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
1880 | might -- code, read-only data, read-write data, small data. Tally | |
1881 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
1882 | belongs in init. */ | |
49668688 | 1883 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
1884 | { |
1885 | static unsigned long const masks[][2] = { | |
1886 | /* NOTE: all executable code must be the first section | |
1887 | * in this array; otherwise modify the text_size | |
1888 | * finder in the two loops below */ | |
1889 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1890 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
1891 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
1892 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
1893 | }; | |
1894 | unsigned int m, i; | |
1895 | ||
49668688 RR |
1896 | for (i = 0; i < info->hdr->e_shnum; i++) |
1897 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 LT |
1898 | |
1899 | DEBUGP("Core section allocation order:\n"); | |
1900 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
49668688 RR |
1901 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
1902 | Elf_Shdr *s = &info->sechdrs[i]; | |
1903 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
1904 | |
1905 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1906 | || (s->sh_flags & masks[m][1]) | |
1907 | || s->sh_entsize != ~0UL | |
49668688 | 1908 | || strstarts(sname, ".init")) |
1da177e4 | 1909 | continue; |
088af9a6 | 1910 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
49668688 | 1911 | DEBUGP("\t%s\n", name); |
1da177e4 | 1912 | } |
84e1c6bb MC |
1913 | switch (m) { |
1914 | case 0: /* executable */ | |
1915 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 1916 | mod->core_text_size = mod->core_size; |
84e1c6bb MC |
1917 | break; |
1918 | case 1: /* RO: text and ro-data */ | |
1919 | mod->core_size = debug_align(mod->core_size); | |
1920 | mod->core_ro_size = mod->core_size; | |
1921 | break; | |
1922 | case 3: /* whole core */ | |
1923 | mod->core_size = debug_align(mod->core_size); | |
1924 | break; | |
1925 | } | |
1da177e4 LT |
1926 | } |
1927 | ||
1928 | DEBUGP("Init section allocation order:\n"); | |
1929 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { | |
49668688 RR |
1930 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
1931 | Elf_Shdr *s = &info->sechdrs[i]; | |
1932 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
1933 | |
1934 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
1935 | || (s->sh_flags & masks[m][1]) | |
1936 | || s->sh_entsize != ~0UL | |
49668688 | 1937 | || !strstarts(sname, ".init")) |
1da177e4 | 1938 | continue; |
088af9a6 | 1939 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 1940 | | INIT_OFFSET_MASK); |
49668688 | 1941 | DEBUGP("\t%s\n", sname); |
1da177e4 | 1942 | } |
84e1c6bb MC |
1943 | switch (m) { |
1944 | case 0: /* executable */ | |
1945 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 1946 | mod->init_text_size = mod->init_size; |
84e1c6bb MC |
1947 | break; |
1948 | case 1: /* RO: text and ro-data */ | |
1949 | mod->init_size = debug_align(mod->init_size); | |
1950 | mod->init_ro_size = mod->init_size; | |
1951 | break; | |
1952 | case 3: /* whole init */ | |
1953 | mod->init_size = debug_align(mod->init_size); | |
1954 | break; | |
1955 | } | |
1da177e4 LT |
1956 | } |
1957 | } | |
1958 | ||
1da177e4 LT |
1959 | static void set_license(struct module *mod, const char *license) |
1960 | { | |
1961 | if (!license) | |
1962 | license = "unspecified"; | |
1963 | ||
fa3ba2e8 | 1964 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 1965 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 1966 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
1967 | "kernel.\n", mod->name, license); |
1968 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
1969 | } |
1970 | } | |
1971 | ||
1972 | /* Parse tag=value strings from .modinfo section */ | |
1973 | static char *next_string(char *string, unsigned long *secsize) | |
1974 | { | |
1975 | /* Skip non-zero chars */ | |
1976 | while (string[0]) { | |
1977 | string++; | |
1978 | if ((*secsize)-- <= 1) | |
1979 | return NULL; | |
1980 | } | |
1981 | ||
1982 | /* Skip any zero padding. */ | |
1983 | while (!string[0]) { | |
1984 | string++; | |
1985 | if ((*secsize)-- <= 1) | |
1986 | return NULL; | |
1987 | } | |
1988 | return string; | |
1989 | } | |
1990 | ||
49668688 | 1991 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
1992 | { |
1993 | char *p; | |
1994 | unsigned int taglen = strlen(tag); | |
49668688 RR |
1995 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
1996 | unsigned long size = infosec->sh_size; | |
1da177e4 | 1997 | |
49668688 | 1998 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
1999 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2000 | return p + taglen + 1; | |
2001 | } | |
2002 | return NULL; | |
2003 | } | |
2004 | ||
49668688 | 2005 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2006 | { |
2007 | struct module_attribute *attr; | |
2008 | int i; | |
2009 | ||
2010 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2011 | if (attr->setup) | |
49668688 | 2012 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2013 | } |
2014 | } | |
c988d2b2 | 2015 | |
a263f776 RR |
2016 | static void free_modinfo(struct module *mod) |
2017 | { | |
2018 | struct module_attribute *attr; | |
2019 | int i; | |
2020 | ||
2021 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2022 | if (attr->free) | |
2023 | attr->free(mod); | |
2024 | } | |
2025 | } | |
2026 | ||
1da177e4 | 2027 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2028 | |
2029 | /* lookup symbol in given range of kernel_symbols */ | |
2030 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2031 | const struct kernel_symbol *start, | |
2032 | const struct kernel_symbol *stop) | |
2033 | { | |
2034 | const struct kernel_symbol *ks = start; | |
2035 | for (; ks < stop; ks++) | |
2036 | if (strcmp(ks->name, name) == 0) | |
2037 | return ks; | |
2038 | return NULL; | |
2039 | } | |
2040 | ||
ca4787b7 TA |
2041 | static int is_exported(const char *name, unsigned long value, |
2042 | const struct module *mod) | |
1da177e4 | 2043 | { |
ca4787b7 TA |
2044 | const struct kernel_symbol *ks; |
2045 | if (!mod) | |
2046 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2047 | else |
ca4787b7 TA |
2048 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2049 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2050 | } |
2051 | ||
2052 | /* As per nm */ | |
eded41c1 | 2053 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2054 | { |
eded41c1 RR |
2055 | const Elf_Shdr *sechdrs = info->sechdrs; |
2056 | ||
1da177e4 LT |
2057 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2058 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2059 | return 'v'; | |
2060 | else | |
2061 | return 'w'; | |
2062 | } | |
2063 | if (sym->st_shndx == SHN_UNDEF) | |
2064 | return 'U'; | |
2065 | if (sym->st_shndx == SHN_ABS) | |
2066 | return 'a'; | |
2067 | if (sym->st_shndx >= SHN_LORESERVE) | |
2068 | return '?'; | |
2069 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2070 | return 't'; | |
2071 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2072 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2073 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2074 | return 'r'; | |
2075 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2076 | return 'g'; | |
2077 | else | |
2078 | return 'd'; | |
2079 | } | |
2080 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2081 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2082 | return 's'; | |
2083 | else | |
2084 | return 'b'; | |
2085 | } | |
eded41c1 RR |
2086 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2087 | ".debug")) { | |
1da177e4 | 2088 | return 'n'; |
eded41c1 | 2089 | } |
1da177e4 LT |
2090 | return '?'; |
2091 | } | |
2092 | ||
4a496226 JB |
2093 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
2094 | unsigned int shnum) | |
2095 | { | |
2096 | const Elf_Shdr *sec; | |
2097 | ||
2098 | if (src->st_shndx == SHN_UNDEF | |
2099 | || src->st_shndx >= shnum | |
2100 | || !src->st_name) | |
2101 | return false; | |
2102 | ||
2103 | sec = sechdrs + src->st_shndx; | |
2104 | if (!(sec->sh_flags & SHF_ALLOC) | |
2105 | #ifndef CONFIG_KALLSYMS_ALL | |
2106 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2107 | #endif | |
2108 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2109 | return false; | |
2110 | ||
2111 | return true; | |
2112 | } | |
2113 | ||
49668688 | 2114 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2115 | { |
49668688 RR |
2116 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2117 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 JB |
2118 | const Elf_Sym *src; |
2119 | unsigned int i, nsrc, ndst; | |
2120 | ||
2121 | /* Put symbol section at end of init part of module. */ | |
2122 | symsect->sh_flags |= SHF_ALLOC; | |
2123 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 RR |
2124 | info->index.sym) | INIT_OFFSET_MASK; |
2125 | DEBUGP("\t%s\n", info->secstrings + symsect->sh_name); | |
4a496226 | 2126 | |
49668688 | 2127 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 JB |
2128 | nsrc = symsect->sh_size / sizeof(*src); |
2129 | for (ndst = i = 1; i < nsrc; ++i, ++src) | |
49668688 | 2130 | if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) { |
554bdfe5 JB |
2131 | unsigned int j = src->st_name; |
2132 | ||
49668688 RR |
2133 | while (!__test_and_set_bit(j, info->strmap) |
2134 | && info->strtab[j]) | |
554bdfe5 | 2135 | ++j; |
4a496226 | 2136 | ++ndst; |
554bdfe5 | 2137 | } |
4a496226 JB |
2138 | |
2139 | /* Append room for core symbols at end of core part. */ | |
49668688 RR |
2140 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
2141 | mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); | |
4a496226 | 2142 | |
554bdfe5 JB |
2143 | /* Put string table section at end of init part of module. */ |
2144 | strsect->sh_flags |= SHF_ALLOC; | |
2145 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 RR |
2146 | info->index.str) | INIT_OFFSET_MASK; |
2147 | DEBUGP("\t%s\n", info->secstrings + strsect->sh_name); | |
554bdfe5 JB |
2148 | |
2149 | /* Append room for core symbols' strings at end of core part. */ | |
49668688 RR |
2150 | info->stroffs = mod->core_size; |
2151 | __set_bit(0, info->strmap); | |
2152 | mod->core_size += bitmap_weight(info->strmap, strsect->sh_size); | |
4a496226 JB |
2153 | } |
2154 | ||
811d66a0 | 2155 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2156 | { |
4a496226 JB |
2157 | unsigned int i, ndst; |
2158 | const Elf_Sym *src; | |
2159 | Elf_Sym *dst; | |
554bdfe5 | 2160 | char *s; |
eded41c1 | 2161 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2162 | |
eded41c1 RR |
2163 | mod->symtab = (void *)symsec->sh_addr; |
2164 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2165 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2166 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2167 | |
2168 | /* Set types up while we still have access to sections. */ | |
2169 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2170 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2171 | |
d913188c | 2172 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
4a496226 JB |
2173 | src = mod->symtab; |
2174 | *dst = *src; | |
2175 | for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { | |
eded41c1 | 2176 | if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) |
4a496226 JB |
2177 | continue; |
2178 | dst[ndst] = *src; | |
d913188c RR |
2179 | dst[ndst].st_name = bitmap_weight(info->strmap, |
2180 | dst[ndst].st_name); | |
4a496226 JB |
2181 | ++ndst; |
2182 | } | |
2183 | mod->core_num_syms = ndst; | |
554bdfe5 | 2184 | |
d913188c | 2185 | mod->core_strtab = s = mod->module_core + info->stroffs; |
eded41c1 | 2186 | for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i) |
d913188c | 2187 | if (test_bit(i, info->strmap)) |
554bdfe5 | 2188 | *++s = mod->strtab[i]; |
1da177e4 LT |
2189 | } |
2190 | #else | |
49668688 | 2191 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2192 | { |
2193 | } | |
3ae91c21 | 2194 | |
abbce906 | 2195 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2196 | { |
2197 | } | |
2198 | #endif /* CONFIG_KALLSYMS */ | |
2199 | ||
e9d376f0 | 2200 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2201 | { |
811d66a0 RR |
2202 | if (!debug) |
2203 | return; | |
e9d376f0 JB |
2204 | #ifdef CONFIG_DYNAMIC_DEBUG |
2205 | if (ddebug_add_module(debug, num, debug->modname)) | |
2206 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2207 | debug->modname); | |
2208 | #endif | |
5e458cc0 | 2209 | } |
346e15be | 2210 | |
ff49d74a YS |
2211 | static void dynamic_debug_remove(struct _ddebug *debug) |
2212 | { | |
2213 | if (debug) | |
2214 | ddebug_remove_module(debug->modname); | |
2215 | } | |
2216 | ||
3a642e99 RR |
2217 | static void *module_alloc_update_bounds(unsigned long size) |
2218 | { | |
2219 | void *ret = module_alloc(size); | |
2220 | ||
2221 | if (ret) { | |
75676500 | 2222 | mutex_lock(&module_mutex); |
3a642e99 RR |
2223 | /* Update module bounds. */ |
2224 | if ((unsigned long)ret < module_addr_min) | |
2225 | module_addr_min = (unsigned long)ret; | |
2226 | if ((unsigned long)ret + size > module_addr_max) | |
2227 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2228 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2229 | } |
2230 | return ret; | |
2231 | } | |
2232 | ||
4f2294b6 | 2233 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2234 | static void kmemleak_load_module(const struct module *mod, |
2235 | const struct load_info *info) | |
4f2294b6 CM |
2236 | { |
2237 | unsigned int i; | |
2238 | ||
2239 | /* only scan the sections containing data */ | |
c017b4be | 2240 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2241 | |
49668688 RR |
2242 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2243 | const char *name = info->secstrings + info->sechdrs[i].sh_name; | |
2244 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC)) | |
4f2294b6 | 2245 | continue; |
49668688 | 2246 | if (!strstarts(name, ".data") && !strstarts(name, ".bss")) |
4f2294b6 CM |
2247 | continue; |
2248 | ||
49668688 RR |
2249 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2250 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2251 | } |
2252 | } | |
2253 | #else | |
49668688 RR |
2254 | static inline void kmemleak_load_module(const struct module *mod, |
2255 | const struct load_info *info) | |
4f2294b6 CM |
2256 | { |
2257 | } | |
2258 | #endif | |
2259 | ||
6526c534 | 2260 | /* Sets info->hdr and info->len. */ |
d913188c RR |
2261 | static int copy_and_check(struct load_info *info, |
2262 | const void __user *umod, unsigned long len, | |
2263 | const char __user *uargs) | |
40dd2560 RR |
2264 | { |
2265 | int err; | |
2266 | Elf_Ehdr *hdr; | |
2267 | ||
2268 | if (len < sizeof(*hdr)) | |
2269 | return -ENOEXEC; | |
2270 | ||
2271 | /* Suck in entire file: we'll want most of it. */ | |
2272 | /* vmalloc barfs on "unusual" numbers. Check here */ | |
3264d3f9 | 2273 | if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
40dd2560 RR |
2274 | return -ENOMEM; |
2275 | ||
2276 | if (copy_from_user(hdr, umod, len) != 0) { | |
2277 | err = -EFAULT; | |
2278 | goto free_hdr; | |
2279 | } | |
2280 | ||
2281 | /* Sanity checks against insmoding binaries or wrong arch, | |
2282 | weird elf version */ | |
2283 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2284 | || hdr->e_type != ET_REL | |
2285 | || !elf_check_arch(hdr) | |
2286 | || hdr->e_shentsize != sizeof(Elf_Shdr)) { | |
2287 | err = -ENOEXEC; | |
2288 | goto free_hdr; | |
2289 | } | |
2290 | ||
2291 | if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { | |
2292 | err = -ENOEXEC; | |
2293 | goto free_hdr; | |
2294 | } | |
d913188c | 2295 | |
3264d3f9 LT |
2296 | info->hdr = hdr; |
2297 | info->len = len; | |
40dd2560 RR |
2298 | return 0; |
2299 | ||
2300 | free_hdr: | |
2301 | vfree(hdr); | |
2302 | return err; | |
2303 | } | |
2304 | ||
d913188c RR |
2305 | static void free_copy(struct load_info *info) |
2306 | { | |
d913188c RR |
2307 | vfree(info->hdr); |
2308 | } | |
2309 | ||
8b5f61a7 RR |
2310 | static int rewrite_section_headers(struct load_info *info) |
2311 | { | |
2312 | unsigned int i; | |
2313 | ||
2314 | /* This should always be true, but let's be sure. */ | |
2315 | info->sechdrs[0].sh_addr = 0; | |
2316 | ||
2317 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2318 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2319 | if (shdr->sh_type != SHT_NOBITS | |
2320 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
2321 | printk(KERN_ERR "Module len %lu truncated\n", | |
2322 | info->len); | |
2323 | return -ENOEXEC; | |
2324 | } | |
2325 | ||
2326 | /* Mark all sections sh_addr with their address in the | |
2327 | temporary image. */ | |
2328 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2329 | ||
2330 | #ifndef CONFIG_MODULE_UNLOAD | |
2331 | /* Don't load .exit sections */ | |
2332 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2333 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2334 | #endif | |
8b5f61a7 | 2335 | } |
d6df72a0 RR |
2336 | |
2337 | /* Track but don't keep modinfo and version sections. */ | |
49668688 RR |
2338 | info->index.vers = find_sec(info, "__versions"); |
2339 | info->index.info = find_sec(info, ".modinfo"); | |
d6df72a0 RR |
2340 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2341 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2342 | return 0; |
2343 | } | |
2344 | ||
3264d3f9 LT |
2345 | /* |
2346 | * Set up our basic convenience variables (pointers to section headers, | |
2347 | * search for module section index etc), and do some basic section | |
2348 | * verification. | |
2349 | * | |
2350 | * Return the temporary module pointer (we'll replace it with the final | |
2351 | * one when we move the module sections around). | |
2352 | */ | |
2353 | static struct module *setup_load_info(struct load_info *info) | |
2354 | { | |
2355 | unsigned int i; | |
8b5f61a7 | 2356 | int err; |
3264d3f9 LT |
2357 | struct module *mod; |
2358 | ||
2359 | /* Set up the convenience variables */ | |
2360 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2361 | info->secstrings = (void *)info->hdr |
2362 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2363 | |
8b5f61a7 RR |
2364 | err = rewrite_section_headers(info); |
2365 | if (err) | |
2366 | return ERR_PTR(err); | |
3264d3f9 | 2367 | |
8b5f61a7 RR |
2368 | /* Find internal symbols and strings. */ |
2369 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2370 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2371 | info->index.sym = i; | |
2372 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2373 | info->strtab = (char *)info->hdr |
2374 | + info->sechdrs[info->index.str].sh_offset; | |
2375 | break; | |
3264d3f9 | 2376 | } |
3264d3f9 LT |
2377 | } |
2378 | ||
49668688 | 2379 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 LT |
2380 | if (!info->index.mod) { |
2381 | printk(KERN_WARNING "No module found in object\n"); | |
2382 | return ERR_PTR(-ENOEXEC); | |
2383 | } | |
2384 | /* This is temporary: point mod into copy of data. */ | |
2385 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2386 | ||
2387 | if (info->index.sym == 0) { | |
2388 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2389 | mod->name); | |
2390 | return ERR_PTR(-ENOEXEC); | |
2391 | } | |
2392 | ||
49668688 | 2393 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2394 | |
3264d3f9 LT |
2395 | /* Check module struct version now, before we try to use module. */ |
2396 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2397 | return ERR_PTR(-ENOEXEC); | |
2398 | ||
2399 | return mod; | |
3264d3f9 LT |
2400 | } |
2401 | ||
49668688 | 2402 | static int check_modinfo(struct module *mod, struct load_info *info) |
40dd2560 | 2403 | { |
49668688 | 2404 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2405 | int err; |
2406 | ||
2407 | /* This is allowed: modprobe --force will invalidate it. */ | |
2408 | if (!modmagic) { | |
2409 | err = try_to_force_load(mod, "bad vermagic"); | |
2410 | if (err) | |
2411 | return err; | |
49668688 | 2412 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
40dd2560 RR |
2413 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2414 | mod->name, modmagic, vermagic); | |
2415 | return -ENOEXEC; | |
2416 | } | |
2417 | ||
49668688 | 2418 | if (get_modinfo(info, "staging")) { |
40dd2560 RR |
2419 | add_taint_module(mod, TAINT_CRAP); |
2420 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2421 | " the quality is unknown, you have been warned.\n", | |
2422 | mod->name); | |
2423 | } | |
22e268eb RR |
2424 | |
2425 | /* Set up license info based on the info section */ | |
49668688 | 2426 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2427 | |
40dd2560 RR |
2428 | return 0; |
2429 | } | |
2430 | ||
811d66a0 | 2431 | static void find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2432 | { |
49668688 | 2433 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2434 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2435 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2436 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2437 | mod->crcs = section_addr(info, "__kcrctab"); |
2438 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2439 | sizeof(*mod->gpl_syms), |
2440 | &mod->num_gpl_syms); | |
49668688 RR |
2441 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2442 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2443 | "__ksymtab_gpl_future", |
2444 | sizeof(*mod->gpl_future_syms), | |
2445 | &mod->num_gpl_future_syms); | |
49668688 | 2446 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2447 | |
2448 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2449 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2450 | sizeof(*mod->unused_syms), |
2451 | &mod->num_unused_syms); | |
49668688 RR |
2452 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2453 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2454 | sizeof(*mod->unused_gpl_syms), |
2455 | &mod->num_unused_gpl_syms); | |
49668688 | 2456 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2457 | #endif |
2458 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2459 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb LT |
2460 | sizeof(*mod->ctors), &mod->num_ctors); |
2461 | #endif | |
2462 | ||
2463 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2464 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2465 | sizeof(*mod->tracepoints_ptrs), | |
2466 | &mod->num_tracepoints); | |
f91a13bb | 2467 | #endif |
bf5438fc JB |
2468 | #ifdef HAVE_JUMP_LABEL |
2469 | mod->jump_entries = section_objs(info, "__jump_table", | |
2470 | sizeof(*mod->jump_entries), | |
2471 | &mod->num_jump_entries); | |
2472 | #endif | |
f91a13bb | 2473 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2474 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2475 | sizeof(*mod->trace_events), |
2476 | &mod->num_trace_events); | |
2477 | /* | |
2478 | * This section contains pointers to allocated objects in the trace | |
2479 | * code and not scanning it leads to false positives. | |
2480 | */ | |
2481 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2482 | mod->num_trace_events, GFP_KERNEL); | |
2483 | #endif | |
13b9b6e7 SR |
2484 | #ifdef CONFIG_TRACING |
2485 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2486 | sizeof(*mod->trace_bprintk_fmt_start), | |
2487 | &mod->num_trace_bprintk_fmt); | |
2488 | /* | |
2489 | * This section contains pointers to allocated objects in the trace | |
2490 | * code and not scanning it leads to false positives. | |
2491 | */ | |
2492 | kmemleak_scan_area(mod->trace_bprintk_fmt_start, | |
2493 | sizeof(*mod->trace_bprintk_fmt_start) * | |
2494 | mod->num_trace_bprintk_fmt, GFP_KERNEL); | |
2495 | #endif | |
f91a13bb LT |
2496 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2497 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2498 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2499 | sizeof(*mod->ftrace_callsites), |
2500 | &mod->num_ftrace_callsites); | |
2501 | #endif | |
22e268eb | 2502 | |
811d66a0 RR |
2503 | mod->extable = section_objs(info, "__ex_table", |
2504 | sizeof(*mod->extable), &mod->num_exentries); | |
2505 | ||
49668688 | 2506 | if (section_addr(info, "__obsparm")) |
22e268eb RR |
2507 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2508 | mod->name); | |
811d66a0 RR |
2509 | |
2510 | info->debug = section_objs(info, "__verbose", | |
2511 | sizeof(*info->debug), &info->num_debug); | |
f91a13bb LT |
2512 | } |
2513 | ||
49668688 | 2514 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2515 | { |
2516 | int i; | |
2517 | void *ptr; | |
2518 | ||
2519 | /* Do the allocs. */ | |
2520 | ptr = module_alloc_update_bounds(mod->core_size); | |
2521 | /* | |
2522 | * The pointer to this block is stored in the module structure | |
2523 | * which is inside the block. Just mark it as not being a | |
2524 | * leak. | |
2525 | */ | |
2526 | kmemleak_not_leak(ptr); | |
2527 | if (!ptr) | |
d913188c | 2528 | return -ENOMEM; |
65b8a9b4 LT |
2529 | |
2530 | memset(ptr, 0, mod->core_size); | |
2531 | mod->module_core = ptr; | |
2532 | ||
2533 | ptr = module_alloc_update_bounds(mod->init_size); | |
2534 | /* | |
2535 | * The pointer to this block is stored in the module structure | |
2536 | * which is inside the block. This block doesn't need to be | |
2537 | * scanned as it contains data and code that will be freed | |
2538 | * after the module is initialized. | |
2539 | */ | |
2540 | kmemleak_ignore(ptr); | |
2541 | if (!ptr && mod->init_size) { | |
2542 | module_free(mod, mod->module_core); | |
d913188c | 2543 | return -ENOMEM; |
65b8a9b4 LT |
2544 | } |
2545 | memset(ptr, 0, mod->init_size); | |
2546 | mod->module_init = ptr; | |
2547 | ||
2548 | /* Transfer each section which specifies SHF_ALLOC */ | |
2549 | DEBUGP("final section addresses:\n"); | |
49668688 | 2550 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2551 | void *dest; |
49668688 | 2552 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2553 | |
49668688 | 2554 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2555 | continue; |
2556 | ||
49668688 | 2557 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2558 | dest = mod->module_init |
49668688 | 2559 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2560 | else |
49668688 | 2561 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2562 | |
49668688 RR |
2563 | if (shdr->sh_type != SHT_NOBITS) |
2564 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2565 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2566 | shdr->sh_addr = (unsigned long)dest; |
65b8a9b4 | 2567 | DEBUGP("\t0x%lx %s\n", |
49668688 | 2568 | shdr->sh_addr, info->secstrings + shdr->sh_name); |
65b8a9b4 | 2569 | } |
d913188c RR |
2570 | |
2571 | return 0; | |
65b8a9b4 LT |
2572 | } |
2573 | ||
49668688 | 2574 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
2575 | { |
2576 | /* | |
2577 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2578 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2579 | * using GPL-only symbols it needs. | |
2580 | */ | |
2581 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
2582 | add_taint(TAINT_PROPRIETARY_MODULE); | |
2583 | ||
2584 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2585 | if (strcmp(mod->name, "driverloader") == 0) | |
2586 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
2587 | ||
2588 | #ifdef CONFIG_MODVERSIONS | |
2589 | if ((mod->num_syms && !mod->crcs) | |
2590 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2591 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2592 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2593 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2594 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2595 | #endif | |
2596 | ) { | |
2597 | return try_to_force_load(mod, | |
2598 | "no versions for exported symbols"); | |
2599 | } | |
2600 | #endif | |
2601 | return 0; | |
2602 | } | |
2603 | ||
2604 | static void flush_module_icache(const struct module *mod) | |
2605 | { | |
2606 | mm_segment_t old_fs; | |
2607 | ||
2608 | /* flush the icache in correct context */ | |
2609 | old_fs = get_fs(); | |
2610 | set_fs(KERNEL_DS); | |
2611 | ||
2612 | /* | |
2613 | * Flush the instruction cache, since we've played with text. | |
2614 | * Do it before processing of module parameters, so the module | |
2615 | * can provide parameter accessor functions of its own. | |
2616 | */ | |
2617 | if (mod->module_init) | |
2618 | flush_icache_range((unsigned long)mod->module_init, | |
2619 | (unsigned long)mod->module_init | |
2620 | + mod->init_size); | |
2621 | flush_icache_range((unsigned long)mod->module_core, | |
2622 | (unsigned long)mod->module_core + mod->core_size); | |
2623 | ||
2624 | set_fs(old_fs); | |
2625 | } | |
2626 | ||
d913188c | 2627 | static struct module *layout_and_allocate(struct load_info *info) |
1da177e4 | 2628 | { |
d913188c | 2629 | /* Module within temporary copy. */ |
1da177e4 | 2630 | struct module *mod; |
49668688 | 2631 | Elf_Shdr *pcpusec; |
d913188c | 2632 | int err; |
3ae91c21 | 2633 | |
d913188c RR |
2634 | mod = setup_load_info(info); |
2635 | if (IS_ERR(mod)) | |
2636 | return mod; | |
1da177e4 | 2637 | |
49668688 | 2638 | err = check_modinfo(mod, info); |
40dd2560 RR |
2639 | if (err) |
2640 | return ERR_PTR(err); | |
1da177e4 | 2641 | |
1da177e4 | 2642 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
2643 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2644 | info->secstrings, mod); | |
1da177e4 | 2645 | if (err < 0) |
6526c534 | 2646 | goto out; |
1da177e4 | 2647 | |
49668688 RR |
2648 | pcpusec = &info->sechdrs[info->index.pcpu]; |
2649 | if (pcpusec->sh_size) { | |
1da177e4 | 2650 | /* We have a special allocation for this section. */ |
49668688 RR |
2651 | err = percpu_modalloc(mod, |
2652 | pcpusec->sh_size, pcpusec->sh_addralign); | |
259354de | 2653 | if (err) |
6526c534 | 2654 | goto out; |
49668688 | 2655 | pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2656 | } |
2657 | ||
2658 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2659 | this is done generically; there doesn't appear to be any | |
2660 | special cases for the architectures. */ | |
49668688 | 2661 | layout_sections(mod, info); |
d913188c RR |
2662 | |
2663 | info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size) | |
2664 | * sizeof(long), GFP_KERNEL); | |
2665 | if (!info->strmap) { | |
2666 | err = -ENOMEM; | |
2667 | goto free_percpu; | |
2668 | } | |
49668688 | 2669 | layout_symtab(mod, info); |
1da177e4 | 2670 | |
65b8a9b4 | 2671 | /* Allocate and move to the final place */ |
49668688 | 2672 | err = move_module(mod, info); |
d913188c RR |
2673 | if (err) |
2674 | goto free_strmap; | |
2675 | ||
2676 | /* Module has been copied to its final place now: return it. */ | |
2677 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2678 | kmemleak_load_module(mod, info); |
d913188c RR |
2679 | return mod; |
2680 | ||
2681 | free_strmap: | |
2682 | kfree(info->strmap); | |
2683 | free_percpu: | |
2684 | percpu_modfree(mod); | |
6526c534 | 2685 | out: |
d913188c RR |
2686 | return ERR_PTR(err); |
2687 | } | |
2688 | ||
2689 | /* mod is no longer valid after this! */ | |
2690 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2691 | { | |
2692 | kfree(info->strmap); | |
2693 | percpu_modfree(mod); | |
2694 | module_free(mod, mod->module_init); | |
2695 | module_free(mod, mod->module_core); | |
2696 | } | |
2697 | ||
811d66a0 RR |
2698 | static int post_relocation(struct module *mod, const struct load_info *info) |
2699 | { | |
51f3d0f4 | 2700 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
2701 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
2702 | ||
2703 | /* Copy relocated percpu area over. */ | |
2704 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
2705 | info->sechdrs[info->index.pcpu].sh_size); | |
2706 | ||
51f3d0f4 | 2707 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
2708 | add_kallsyms(mod, info); |
2709 | ||
2710 | /* Arch-specific module finalizing. */ | |
2711 | return module_finalize(info->hdr, info->sechdrs, mod); | |
2712 | } | |
2713 | ||
d913188c RR |
2714 | /* Allocate and load the module: note that size of section 0 is always |
2715 | zero, and we rely on this for optional sections. */ | |
51f3d0f4 | 2716 | static struct module *load_module(void __user *umod, |
d913188c RR |
2717 | unsigned long len, |
2718 | const char __user *uargs) | |
2719 | { | |
2720 | struct load_info info = { NULL, }; | |
2721 | struct module *mod; | |
2722 | long err; | |
d913188c RR |
2723 | |
2724 | DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", | |
2725 | umod, len, uargs); | |
2726 | ||
2727 | /* Copy in the blobs from userspace, check they are vaguely sane. */ | |
2728 | err = copy_and_check(&info, umod, len, uargs); | |
2729 | if (err) | |
2730 | return ERR_PTR(err); | |
2731 | ||
2732 | /* Figure out module layout, and allocate all the memory. */ | |
2733 | mod = layout_and_allocate(&info); | |
65b8a9b4 LT |
2734 | if (IS_ERR(mod)) { |
2735 | err = PTR_ERR(mod); | |
d913188c | 2736 | goto free_copy; |
1da177e4 | 2737 | } |
1da177e4 | 2738 | |
49668688 | 2739 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
2740 | err = module_unload_init(mod); |
2741 | if (err) | |
d913188c | 2742 | goto free_module; |
1da177e4 | 2743 | |
22e268eb RR |
2744 | /* Now we've got everything in the final locations, we can |
2745 | * find optional sections. */ | |
49668688 | 2746 | find_module_sections(mod, &info); |
9b37ccfc | 2747 | |
49668688 | 2748 | err = check_module_license_and_versions(mod); |
22e268eb RR |
2749 | if (err) |
2750 | goto free_unload; | |
9841d61d | 2751 | |
c988d2b2 | 2752 | /* Set up MODINFO_ATTR fields */ |
49668688 | 2753 | setup_modinfo(mod, &info); |
c988d2b2 | 2754 | |
1da177e4 | 2755 | /* Fix up syms, so that st_value is a pointer to location. */ |
49668688 | 2756 | err = simplify_symbols(mod, &info); |
1da177e4 | 2757 | if (err < 0) |
d913188c | 2758 | goto free_modinfo; |
1da177e4 | 2759 | |
49668688 | 2760 | err = apply_relocations(mod, &info); |
22e268eb | 2761 | if (err < 0) |
d913188c | 2762 | goto free_modinfo; |
1da177e4 | 2763 | |
811d66a0 | 2764 | err = post_relocation(mod, &info); |
1da177e4 | 2765 | if (err < 0) |
d913188c | 2766 | goto free_modinfo; |
1da177e4 | 2767 | |
22e268eb | 2768 | flush_module_icache(mod); |
378bac82 | 2769 | |
6526c534 RR |
2770 | /* Now copy in args */ |
2771 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
2772 | if (IS_ERR(mod->args)) { | |
2773 | err = PTR_ERR(mod->args); | |
2774 | goto free_arch_cleanup; | |
2775 | } | |
8d3b33f6 | 2776 | |
51f3d0f4 | 2777 | /* Mark state as coming so strong_try_module_get() ignores us. */ |
d913188c RR |
2778 | mod->state = MODULE_STATE_COMING; |
2779 | ||
bb9d3d56 | 2780 | /* Now sew it into the lists so we can get lockdep and oops |
25985edc | 2781 | * info during argument parsing. No one should access us, since |
d72b3751 AK |
2782 | * strong_try_module_get() will fail. |
2783 | * lockdep/oops can run asynchronous, so use the RCU list insertion | |
2784 | * function to insert in a way safe to concurrent readers. | |
2785 | * The mutex protects against concurrent writers. | |
2786 | */ | |
75676500 | 2787 | mutex_lock(&module_mutex); |
3bafeb62 LT |
2788 | if (find_module(mod->name)) { |
2789 | err = -EEXIST; | |
be593f4c | 2790 | goto unlock; |
3bafeb62 LT |
2791 | } |
2792 | ||
811d66a0 RR |
2793 | /* This has to be done once we're sure module name is unique. */ |
2794 | if (!mod->taints) | |
2795 | dynamic_debug_setup(info.debug, info.num_debug); | |
ff49d74a | 2796 | |
be593f4c RR |
2797 | /* Find duplicate symbols */ |
2798 | err = verify_export_symbols(mod); | |
2799 | if (err < 0) | |
ff49d74a | 2800 | goto ddebug; |
be593f4c | 2801 | |
5336377d | 2802 | module_bug_finalize(info.hdr, info.sechdrs, mod); |
d72b3751 | 2803 | list_add_rcu(&mod->list, &modules); |
75676500 | 2804 | mutex_unlock(&module_mutex); |
bb9d3d56 | 2805 | |
51f3d0f4 | 2806 | /* Module is ready to execute: parsing args may do that. */ |
e180a6b7 | 2807 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4 | 2808 | if (err < 0) |
bb9d3d56 | 2809 | goto unlink; |
1da177e4 | 2810 | |
51f3d0f4 | 2811 | /* Link in to syfs. */ |
8f6d0378 | 2812 | err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp); |
1da177e4 | 2813 | if (err < 0) |
bb9d3d56 | 2814 | goto unlink; |
80a3d1bb | 2815 | |
d913188c RR |
2816 | /* Get rid of temporary copy and strmap. */ |
2817 | kfree(info.strmap); | |
2818 | free_copy(&info); | |
1da177e4 LT |
2819 | |
2820 | /* Done! */ | |
51f3d0f4 | 2821 | trace_module_load(mod); |
1da177e4 LT |
2822 | return mod; |
2823 | ||
bb9d3d56 | 2824 | unlink: |
75676500 | 2825 | mutex_lock(&module_mutex); |
e91defa2 RR |
2826 | /* Unlink carefully: kallsyms could be walking list. */ |
2827 | list_del_rcu(&mod->list); | |
5336377d LT |
2828 | module_bug_cleanup(mod); |
2829 | ||
ff49d74a | 2830 | ddebug: |
811d66a0 RR |
2831 | if (!mod->taints) |
2832 | dynamic_debug_remove(info.debug); | |
be593f4c | 2833 | unlock: |
75676500 | 2834 | mutex_unlock(&module_mutex); |
e91defa2 | 2835 | synchronize_sched(); |
6526c534 RR |
2836 | kfree(mod->args); |
2837 | free_arch_cleanup: | |
1da177e4 | 2838 | module_arch_cleanup(mod); |
d913188c | 2839 | free_modinfo: |
a263f776 | 2840 | free_modinfo(mod); |
22e268eb | 2841 | free_unload: |
1da177e4 | 2842 | module_unload_free(mod); |
d913188c RR |
2843 | free_module: |
2844 | module_deallocate(mod, &info); | |
2845 | free_copy: | |
2846 | free_copy(&info); | |
6fe2e70b | 2847 | return ERR_PTR(err); |
1da177e4 LT |
2848 | } |
2849 | ||
b99b87f7 PO |
2850 | /* Call module constructors. */ |
2851 | static void do_mod_ctors(struct module *mod) | |
2852 | { | |
2853 | #ifdef CONFIG_CONSTRUCTORS | |
2854 | unsigned long i; | |
2855 | ||
2856 | for (i = 0; i < mod->num_ctors; i++) | |
2857 | mod->ctors[i](); | |
2858 | #endif | |
2859 | } | |
2860 | ||
1da177e4 | 2861 | /* This is where the real work happens */ |
17da2bd9 HC |
2862 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
2863 | unsigned long, len, const char __user *, uargs) | |
1da177e4 LT |
2864 | { |
2865 | struct module *mod; | |
2866 | int ret = 0; | |
2867 | ||
2868 | /* Must have permission */ | |
3d43321b | 2869 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4 LT |
2870 | return -EPERM; |
2871 | ||
1da177e4 LT |
2872 | /* Do all the hard work */ |
2873 | mod = load_module(umod, len, uargs); | |
75676500 | 2874 | if (IS_ERR(mod)) |
1da177e4 | 2875 | return PTR_ERR(mod); |
1da177e4 | 2876 | |
e041c683 AS |
2877 | blocking_notifier_call_chain(&module_notify_list, |
2878 | MODULE_STATE_COMING, mod); | |
1da177e4 | 2879 | |
94462ad3 SR |
2880 | /* Set RO and NX regions for core */ |
2881 | set_section_ro_nx(mod->module_core, | |
2882 | mod->core_text_size, | |
2883 | mod->core_ro_size, | |
2884 | mod->core_size); | |
2885 | ||
2886 | /* Set RO and NX regions for init */ | |
2887 | set_section_ro_nx(mod->module_init, | |
2888 | mod->init_text_size, | |
2889 | mod->init_ro_size, | |
2890 | mod->init_size); | |
2891 | ||
b99b87f7 | 2892 | do_mod_ctors(mod); |
1da177e4 LT |
2893 | /* Start the module */ |
2894 | if (mod->init != NULL) | |
59f9415f | 2895 | ret = do_one_initcall(mod->init); |
1da177e4 LT |
2896 | if (ret < 0) { |
2897 | /* Init routine failed: abort. Try to protect us from | |
2898 | buggy refcounters. */ | |
2899 | mod->state = MODULE_STATE_GOING; | |
fbd568a3 | 2900 | synchronize_sched(); |
af49d924 | 2901 | module_put(mod); |
df4b565e PO |
2902 | blocking_notifier_call_chain(&module_notify_list, |
2903 | MODULE_STATE_GOING, mod); | |
af49d924 | 2904 | free_module(mod); |
c9a3ba55 | 2905 | wake_up(&module_wq); |
1da177e4 LT |
2906 | return ret; |
2907 | } | |
e24e2e64 | 2908 | if (ret > 0) { |
ad361c98 JP |
2909 | printk(KERN_WARNING |
2910 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
2911 | "%s: loading module anyway...\n", | |
e24e2e64 AD |
2912 | __func__, mod->name, ret, |
2913 | __func__); | |
2914 | dump_stack(); | |
2915 | } | |
1da177e4 | 2916 | |
6c5db22d | 2917 | /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4 | 2918 | mod->state = MODULE_STATE_LIVE; |
6c5db22d | 2919 | wake_up(&module_wq); |
0deddf43 MH |
2920 | blocking_notifier_call_chain(&module_notify_list, |
2921 | MODULE_STATE_LIVE, mod); | |
6c5db22d | 2922 | |
d6de2c80 LT |
2923 | /* We need to finish all async code before the module init sequence is done */ |
2924 | async_synchronize_full(); | |
2925 | ||
6c5db22d | 2926 | mutex_lock(&module_mutex); |
1da177e4 LT |
2927 | /* Drop initial reference. */ |
2928 | module_put(mod); | |
ad6561df | 2929 | trim_init_extable(mod); |
4a496226 JB |
2930 | #ifdef CONFIG_KALLSYMS |
2931 | mod->num_symtab = mod->core_num_syms; | |
2932 | mod->symtab = mod->core_symtab; | |
554bdfe5 | 2933 | mod->strtab = mod->core_strtab; |
4a496226 | 2934 | #endif |
84e1c6bb | 2935 | unset_section_ro_nx(mod, mod->module_init); |
1da177e4 LT |
2936 | module_free(mod, mod->module_init); |
2937 | mod->module_init = NULL; | |
2938 | mod->init_size = 0; | |
4d10380e | 2939 | mod->init_ro_size = 0; |
1da177e4 | 2940 | mod->init_text_size = 0; |
6389a385 | 2941 | mutex_unlock(&module_mutex); |
1da177e4 LT |
2942 | |
2943 | return 0; | |
2944 | } | |
2945 | ||
2946 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
2947 | { | |
2948 | return ((void *)addr >= start && (void *)addr < start + size); | |
2949 | } | |
2950 | ||
2951 | #ifdef CONFIG_KALLSYMS | |
2952 | /* | |
2953 | * This ignores the intensely annoying "mapping symbols" found | |
2954 | * in ARM ELF files: $a, $t and $d. | |
2955 | */ | |
2956 | static inline int is_arm_mapping_symbol(const char *str) | |
2957 | { | |
22a8bdeb | 2958 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
2959 | && (str[2] == '\0' || str[2] == '.'); |
2960 | } | |
2961 | ||
2962 | static const char *get_ksymbol(struct module *mod, | |
2963 | unsigned long addr, | |
2964 | unsigned long *size, | |
2965 | unsigned long *offset) | |
2966 | { | |
2967 | unsigned int i, best = 0; | |
2968 | unsigned long nextval; | |
2969 | ||
2970 | /* At worse, next value is at end of module */ | |
a06f6211 | 2971 | if (within_module_init(addr, mod)) |
1da177e4 | 2972 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 2973 | else |
1da177e4 LT |
2974 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
2975 | ||
25985edc | 2976 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 2977 | starts real symbols at 1). */ |
1da177e4 LT |
2978 | for (i = 1; i < mod->num_symtab; i++) { |
2979 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
2980 | continue; | |
2981 | ||
2982 | /* We ignore unnamed symbols: they're uninformative | |
2983 | * and inserted at a whim. */ | |
2984 | if (mod->symtab[i].st_value <= addr | |
2985 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
2986 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2987 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2988 | best = i; | |
2989 | if (mod->symtab[i].st_value > addr | |
2990 | && mod->symtab[i].st_value < nextval | |
2991 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
2992 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
2993 | nextval = mod->symtab[i].st_value; | |
2994 | } | |
2995 | ||
2996 | if (!best) | |
2997 | return NULL; | |
2998 | ||
ffb45122 AD |
2999 | if (size) |
3000 | *size = nextval - mod->symtab[best].st_value; | |
3001 | if (offset) | |
3002 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3003 | return mod->strtab + mod->symtab[best].st_name; |
3004 | } | |
3005 | ||
6dd06c9f RR |
3006 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3007 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3008 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3009 | unsigned long *size, |
3010 | unsigned long *offset, | |
3011 | char **modname, | |
3012 | char *namebuf) | |
1da177e4 LT |
3013 | { |
3014 | struct module *mod; | |
cb2a5205 | 3015 | const char *ret = NULL; |
1da177e4 | 3016 | |
cb2a5205 | 3017 | preempt_disable(); |
d72b3751 | 3018 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
3019 | if (within_module_init(addr, mod) || |
3020 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
3021 | if (modname) |
3022 | *modname = mod->name; | |
cb2a5205 RR |
3023 | ret = get_ksymbol(mod, addr, size, offset); |
3024 | break; | |
1da177e4 LT |
3025 | } |
3026 | } | |
6dd06c9f RR |
3027 | /* Make a copy in here where it's safe */ |
3028 | if (ret) { | |
3029 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3030 | ret = namebuf; | |
3031 | } | |
cb2a5205 | 3032 | preempt_enable(); |
92dfc9dc | 3033 | return ret; |
1da177e4 LT |
3034 | } |
3035 | ||
9d65cb4a AD |
3036 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3037 | { | |
3038 | struct module *mod; | |
3039 | ||
cb2a5205 | 3040 | preempt_disable(); |
d72b3751 | 3041 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
3042 | if (within_module_init(addr, mod) || |
3043 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
3044 | const char *sym; |
3045 | ||
3046 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3047 | if (!sym) | |
3048 | goto out; | |
9281acea | 3049 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3050 | preempt_enable(); |
9d65cb4a AD |
3051 | return 0; |
3052 | } | |
3053 | } | |
3054 | out: | |
cb2a5205 | 3055 | preempt_enable(); |
9d65cb4a AD |
3056 | return -ERANGE; |
3057 | } | |
3058 | ||
a5c43dae AD |
3059 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3060 | unsigned long *offset, char *modname, char *name) | |
3061 | { | |
3062 | struct module *mod; | |
3063 | ||
cb2a5205 | 3064 | preempt_disable(); |
d72b3751 | 3065 | list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211 MH |
3066 | if (within_module_init(addr, mod) || |
3067 | within_module_core(addr, mod)) { | |
a5c43dae AD |
3068 | const char *sym; |
3069 | ||
3070 | sym = get_ksymbol(mod, addr, size, offset); | |
3071 | if (!sym) | |
3072 | goto out; | |
3073 | if (modname) | |
9281acea | 3074 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3075 | if (name) |
9281acea | 3076 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3077 | preempt_enable(); |
a5c43dae AD |
3078 | return 0; |
3079 | } | |
3080 | } | |
3081 | out: | |
cb2a5205 | 3082 | preempt_enable(); |
a5c43dae AD |
3083 | return -ERANGE; |
3084 | } | |
3085 | ||
ea07890a AD |
3086 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3087 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3088 | { |
3089 | struct module *mod; | |
3090 | ||
cb2a5205 | 3091 | preempt_disable(); |
d72b3751 | 3092 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3093 | if (symnum < mod->num_symtab) { |
3094 | *value = mod->symtab[symnum].st_value; | |
3095 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3096 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3097 | KSYM_NAME_LEN); |
3098 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3099 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3100 | preempt_enable(); |
ea07890a | 3101 | return 0; |
1da177e4 LT |
3102 | } |
3103 | symnum -= mod->num_symtab; | |
3104 | } | |
cb2a5205 | 3105 | preempt_enable(); |
ea07890a | 3106 | return -ERANGE; |
1da177e4 LT |
3107 | } |
3108 | ||
3109 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3110 | { | |
3111 | unsigned int i; | |
3112 | ||
3113 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3114 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3115 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3116 | return mod->symtab[i].st_value; |
3117 | return 0; | |
3118 | } | |
3119 | ||
3120 | /* Look for this name: can be of form module:name. */ | |
3121 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3122 | { | |
3123 | struct module *mod; | |
3124 | char *colon; | |
3125 | unsigned long ret = 0; | |
3126 | ||
3127 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3128 | preempt_disable(); |
1da177e4 LT |
3129 | if ((colon = strchr(name, ':')) != NULL) { |
3130 | *colon = '\0'; | |
3131 | if ((mod = find_module(name)) != NULL) | |
3132 | ret = mod_find_symname(mod, colon+1); | |
3133 | *colon = ':'; | |
3134 | } else { | |
d72b3751 | 3135 | list_for_each_entry_rcu(mod, &modules, list) |
1da177e4 LT |
3136 | if ((ret = mod_find_symname(mod, name)) != 0) |
3137 | break; | |
3138 | } | |
cb2a5205 | 3139 | preempt_enable(); |
1da177e4 LT |
3140 | return ret; |
3141 | } | |
75a66614 AK |
3142 | |
3143 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3144 | struct module *, unsigned long), | |
3145 | void *data) | |
3146 | { | |
3147 | struct module *mod; | |
3148 | unsigned int i; | |
3149 | int ret; | |
3150 | ||
3151 | list_for_each_entry(mod, &modules, list) { | |
3152 | for (i = 0; i < mod->num_symtab; i++) { | |
3153 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3154 | mod, mod->symtab[i].st_value); | |
3155 | if (ret != 0) | |
3156 | return ret; | |
3157 | } | |
3158 | } | |
3159 | return 0; | |
3160 | } | |
1da177e4 LT |
3161 | #endif /* CONFIG_KALLSYMS */ |
3162 | ||
21aa9280 | 3163 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3164 | { |
3165 | int bx = 0; | |
3166 | ||
21aa9280 AV |
3167 | if (mod->taints || |
3168 | mod->state == MODULE_STATE_GOING || | |
3169 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3170 | buf[bx++] = '('; |
25ddbb18 | 3171 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e8 | 3172 | buf[bx++] = 'P'; |
25ddbb18 | 3173 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e8 | 3174 | buf[bx++] = 'F'; |
26e9a397 | 3175 | if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd3 | 3176 | buf[bx++] = 'C'; |
fa3ba2e8 FM |
3177 | /* |
3178 | * TAINT_FORCED_RMMOD: could be added. | |
3179 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
3180 | * apply to modules. | |
3181 | */ | |
21aa9280 AV |
3182 | |
3183 | /* Show a - for module-is-being-unloaded */ | |
3184 | if (mod->state == MODULE_STATE_GOING) | |
3185 | buf[bx++] = '-'; | |
3186 | /* Show a + for module-is-being-loaded */ | |
3187 | if (mod->state == MODULE_STATE_COMING) | |
3188 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3189 | buf[bx++] = ')'; |
3190 | } | |
3191 | buf[bx] = '\0'; | |
3192 | ||
3193 | return buf; | |
3194 | } | |
3195 | ||
3b5d5c6b AD |
3196 | #ifdef CONFIG_PROC_FS |
3197 | /* Called by the /proc file system to return a list of modules. */ | |
3198 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3199 | { | |
3200 | mutex_lock(&module_mutex); | |
3201 | return seq_list_start(&modules, *pos); | |
3202 | } | |
3203 | ||
3204 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3205 | { | |
3206 | return seq_list_next(p, &modules, pos); | |
3207 | } | |
3208 | ||
3209 | static void m_stop(struct seq_file *m, void *p) | |
3210 | { | |
3211 | mutex_unlock(&module_mutex); | |
3212 | } | |
3213 | ||
1da177e4 LT |
3214 | static int m_show(struct seq_file *m, void *p) |
3215 | { | |
3216 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3217 | char buf[8]; |
3218 | ||
2f0f2a33 | 3219 | seq_printf(m, "%s %u", |
1da177e4 LT |
3220 | mod->name, mod->init_size + mod->core_size); |
3221 | print_unload_info(m, mod); | |
3222 | ||
3223 | /* Informative for users. */ | |
3224 | seq_printf(m, " %s", | |
3225 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3226 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3227 | "Live"); | |
3228 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3229 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3230 | |
fa3ba2e8 FM |
3231 | /* Taints info */ |
3232 | if (mod->taints) | |
21aa9280 | 3233 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3234 | |
1da177e4 LT |
3235 | seq_printf(m, "\n"); |
3236 | return 0; | |
3237 | } | |
3238 | ||
3239 | /* Format: modulename size refcount deps address | |
3240 | ||
3241 | Where refcount is a number or -, and deps is a comma-separated list | |
3242 | of depends or -. | |
3243 | */ | |
3b5d5c6b | 3244 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3245 | .start = m_start, |
3246 | .next = m_next, | |
3247 | .stop = m_stop, | |
3248 | .show = m_show | |
3249 | }; | |
3250 | ||
3b5d5c6b AD |
3251 | static int modules_open(struct inode *inode, struct file *file) |
3252 | { | |
3253 | return seq_open(file, &modules_op); | |
3254 | } | |
3255 | ||
3256 | static const struct file_operations proc_modules_operations = { | |
3257 | .open = modules_open, | |
3258 | .read = seq_read, | |
3259 | .llseek = seq_lseek, | |
3260 | .release = seq_release, | |
3261 | }; | |
3262 | ||
3263 | static int __init proc_modules_init(void) | |
3264 | { | |
3265 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3266 | return 0; | |
3267 | } | |
3268 | module_init(proc_modules_init); | |
3269 | #endif | |
3270 | ||
1da177e4 LT |
3271 | /* Given an address, look for it in the module exception tables. */ |
3272 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3273 | { | |
1da177e4 LT |
3274 | const struct exception_table_entry *e = NULL; |
3275 | struct module *mod; | |
3276 | ||
24da1cbf | 3277 | preempt_disable(); |
d72b3751 | 3278 | list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4 LT |
3279 | if (mod->num_exentries == 0) |
3280 | continue; | |
22a8bdeb | 3281 | |
1da177e4 LT |
3282 | e = search_extable(mod->extable, |
3283 | mod->extable + mod->num_exentries - 1, | |
3284 | addr); | |
3285 | if (e) | |
3286 | break; | |
3287 | } | |
24da1cbf | 3288 | preempt_enable(); |
1da177e4 LT |
3289 | |
3290 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3291 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3292 | return e; |
3293 | } | |
3294 | ||
4d435f9d | 3295 | /* |
e610499e RR |
3296 | * is_module_address - is this address inside a module? |
3297 | * @addr: the address to check. | |
3298 | * | |
3299 | * See is_module_text_address() if you simply want to see if the address | |
3300 | * is code (not data). | |
4d435f9d | 3301 | */ |
e610499e | 3302 | bool is_module_address(unsigned long addr) |
4d435f9d | 3303 | { |
e610499e | 3304 | bool ret; |
4d435f9d | 3305 | |
24da1cbf | 3306 | preempt_disable(); |
e610499e | 3307 | ret = __module_address(addr) != NULL; |
24da1cbf | 3308 | preempt_enable(); |
4d435f9d | 3309 | |
e610499e | 3310 | return ret; |
4d435f9d IM |
3311 | } |
3312 | ||
e610499e RR |
3313 | /* |
3314 | * __module_address - get the module which contains an address. | |
3315 | * @addr: the address. | |
3316 | * | |
3317 | * Must be called with preempt disabled or module mutex held so that | |
3318 | * module doesn't get freed during this. | |
3319 | */ | |
714f83d5 | 3320 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3321 | { |
3322 | struct module *mod; | |
3323 | ||
3a642e99 RR |
3324 | if (addr < module_addr_min || addr > module_addr_max) |
3325 | return NULL; | |
3326 | ||
d72b3751 | 3327 | list_for_each_entry_rcu(mod, &modules, list) |
e610499e RR |
3328 | if (within_module_core(addr, mod) |
3329 | || within_module_init(addr, mod)) | |
1da177e4 LT |
3330 | return mod; |
3331 | return NULL; | |
3332 | } | |
c6b37801 | 3333 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3334 | |
e610499e RR |
3335 | /* |
3336 | * is_module_text_address - is this address inside module code? | |
3337 | * @addr: the address to check. | |
3338 | * | |
3339 | * See is_module_address() if you simply want to see if the address is | |
3340 | * anywhere in a module. See kernel_text_address() for testing if an | |
3341 | * address corresponds to kernel or module code. | |
3342 | */ | |
3343 | bool is_module_text_address(unsigned long addr) | |
3344 | { | |
3345 | bool ret; | |
3346 | ||
3347 | preempt_disable(); | |
3348 | ret = __module_text_address(addr) != NULL; | |
3349 | preempt_enable(); | |
3350 | ||
3351 | return ret; | |
3352 | } | |
3353 | ||
3354 | /* | |
3355 | * __module_text_address - get the module whose code contains an address. | |
3356 | * @addr: the address. | |
3357 | * | |
3358 | * Must be called with preempt disabled or module mutex held so that | |
3359 | * module doesn't get freed during this. | |
3360 | */ | |
3361 | struct module *__module_text_address(unsigned long addr) | |
3362 | { | |
3363 | struct module *mod = __module_address(addr); | |
3364 | if (mod) { | |
3365 | /* Make sure it's within the text section. */ | |
3366 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3367 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3368 | mod = NULL; | |
3369 | } | |
3370 | return mod; | |
3371 | } | |
c6b37801 | 3372 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3373 | |
1da177e4 LT |
3374 | /* Don't grab lock, we're oopsing. */ |
3375 | void print_modules(void) | |
3376 | { | |
3377 | struct module *mod; | |
2bc2d61a | 3378 | char buf[8]; |
1da177e4 | 3379 | |
b231125a | 3380 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3381 | /* Most callers should already have preempt disabled, but make sure */ |
3382 | preempt_disable(); | |
3383 | list_for_each_entry_rcu(mod, &modules, list) | |
21aa9280 | 3384 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b3751 | 3385 | preempt_enable(); |
e14af7ee AV |
3386 | if (last_unloaded_module[0]) |
3387 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3388 | printk("\n"); |
3389 | } | |
3390 | ||
1da177e4 | 3391 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3392 | /* Generate the signature for all relevant module structures here. |
3393 | * If these change, we don't want to try to parse the module. */ | |
3394 | void module_layout(struct module *mod, | |
3395 | struct modversion_info *ver, | |
3396 | struct kernel_param *kp, | |
3397 | struct kernel_symbol *ks, | |
65498646 | 3398 | struct tracepoint * const *tp) |
8c8ef42a RR |
3399 | { |
3400 | } | |
3401 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3402 | #endif |
8256e47c | 3403 | |
97e1c18e MD |
3404 | #ifdef CONFIG_TRACEPOINTS |
3405 | void module_update_tracepoints(void) | |
3406 | { | |
3407 | struct module *mod; | |
3408 | ||
3409 | mutex_lock(&module_mutex); | |
3410 | list_for_each_entry(mod, &modules, list) | |
3411 | if (!mod->taints) | |
65498646 MD |
3412 | tracepoint_update_probe_range(mod->tracepoints_ptrs, |
3413 | mod->tracepoints_ptrs + mod->num_tracepoints); | |
97e1c18e MD |
3414 | mutex_unlock(&module_mutex); |
3415 | } | |
3416 | ||
3417 | /* | |
3418 | * Returns 0 if current not found. | |
3419 | * Returns 1 if current found. | |
3420 | */ | |
3421 | int module_get_iter_tracepoints(struct tracepoint_iter *iter) | |
3422 | { | |
3423 | struct module *iter_mod; | |
3424 | int found = 0; | |
3425 | ||
3426 | mutex_lock(&module_mutex); | |
3427 | list_for_each_entry(iter_mod, &modules, list) { | |
3428 | if (!iter_mod->taints) { | |
3429 | /* | |
3430 | * Sorted module list | |
3431 | */ | |
3432 | if (iter_mod < iter->module) | |
3433 | continue; | |
3434 | else if (iter_mod > iter->module) | |
3435 | iter->tracepoint = NULL; | |
3436 | found = tracepoint_get_iter_range(&iter->tracepoint, | |
65498646 MD |
3437 | iter_mod->tracepoints_ptrs, |
3438 | iter_mod->tracepoints_ptrs | |
97e1c18e MD |
3439 | + iter_mod->num_tracepoints); |
3440 | if (found) { | |
3441 | iter->module = iter_mod; | |
3442 | break; | |
3443 | } | |
3444 | } | |
3445 | } | |
3446 | mutex_unlock(&module_mutex); | |
3447 | return found; | |
3448 | } | |
3449 | #endif |