crash_core.c 13 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * crash.c - kernel crash support code.
  4. * Copyright (C) 2002-2004 Eric Biederman <[email protected]>
  5. */
  6. #include <linux/buildid.h>
  7. #include <linux/crash_core.h>
  8. #include <linux/init.h>
  9. #include <linux/utsname.h>
  10. #include <linux/vmalloc.h>
  11. #include <linux/sizes.h>
  12. #include <asm/page.h>
  13. #include <asm/sections.h>
  14. #include <crypto/sha1.h>
  15. #include "kallsyms_internal.h"
  16. /* vmcoreinfo stuff */
  17. unsigned char *vmcoreinfo_data;
  18. size_t vmcoreinfo_size;
  19. u32 *vmcoreinfo_note;
  20. /* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
  21. static unsigned char *vmcoreinfo_data_safecopy;
  22. /*
  23. * parsing the "crashkernel" commandline
  24. *
  25. * this code is intended to be called from architecture specific code
  26. */
  27. /*
  28. * This function parses command lines in the format
  29. *
  30. * crashkernel=ramsize-range:size[,...][@offset]
  31. *
  32. * The function returns 0 on success and -EINVAL on failure.
  33. */
  34. static int __init parse_crashkernel_mem(char *cmdline,
  35. unsigned long long system_ram,
  36. unsigned long long *crash_size,
  37. unsigned long long *crash_base)
  38. {
  39. char *cur = cmdline, *tmp;
  40. unsigned long long total_mem = system_ram;
  41. /*
  42. * Firmware sometimes reserves some memory regions for its own use,
  43. * so the system memory size is less than the actual physical memory
  44. * size. Work around this by rounding up the total size to 128M,
  45. * which is enough for most test cases.
  46. */
  47. total_mem = roundup(total_mem, SZ_128M);
  48. /* for each entry of the comma-separated list */
  49. do {
  50. unsigned long long start, end = ULLONG_MAX, size;
  51. /* get the start of the range */
  52. start = memparse(cur, &tmp);
  53. if (cur == tmp) {
  54. pr_warn("crashkernel: Memory value expected\n");
  55. return -EINVAL;
  56. }
  57. cur = tmp;
  58. if (*cur != '-') {
  59. pr_warn("crashkernel: '-' expected\n");
  60. return -EINVAL;
  61. }
  62. cur++;
  63. /* if no ':' is here, than we read the end */
  64. if (*cur != ':') {
  65. end = memparse(cur, &tmp);
  66. if (cur == tmp) {
  67. pr_warn("crashkernel: Memory value expected\n");
  68. return -EINVAL;
  69. }
  70. cur = tmp;
  71. if (end <= start) {
  72. pr_warn("crashkernel: end <= start\n");
  73. return -EINVAL;
  74. }
  75. }
  76. if (*cur != ':') {
  77. pr_warn("crashkernel: ':' expected\n");
  78. return -EINVAL;
  79. }
  80. cur++;
  81. size = memparse(cur, &tmp);
  82. if (cur == tmp) {
  83. pr_warn("Memory value expected\n");
  84. return -EINVAL;
  85. }
  86. cur = tmp;
  87. if (size >= total_mem) {
  88. pr_warn("crashkernel: invalid size\n");
  89. return -EINVAL;
  90. }
  91. /* match ? */
  92. if (total_mem >= start && total_mem < end) {
  93. *crash_size = size;
  94. break;
  95. }
  96. } while (*cur++ == ',');
  97. if (*crash_size > 0) {
  98. while (*cur && *cur != ' ' && *cur != '@')
  99. cur++;
  100. if (*cur == '@') {
  101. cur++;
  102. *crash_base = memparse(cur, &tmp);
  103. if (cur == tmp) {
  104. pr_warn("Memory value expected after '@'\n");
  105. return -EINVAL;
  106. }
  107. }
  108. } else
  109. pr_info("crashkernel size resulted in zero bytes\n");
  110. return 0;
  111. }
  112. /*
  113. * That function parses "simple" (old) crashkernel command lines like
  114. *
  115. * crashkernel=size[@offset]
  116. *
  117. * It returns 0 on success and -EINVAL on failure.
  118. */
  119. static int __init parse_crashkernel_simple(char *cmdline,
  120. unsigned long long *crash_size,
  121. unsigned long long *crash_base)
  122. {
  123. char *cur = cmdline;
  124. *crash_size = memparse(cmdline, &cur);
  125. if (cmdline == cur) {
  126. pr_warn("crashkernel: memory value expected\n");
  127. return -EINVAL;
  128. }
  129. if (*cur == '@')
  130. *crash_base = memparse(cur+1, &cur);
  131. else if (*cur != ' ' && *cur != '\0') {
  132. pr_warn("crashkernel: unrecognized char: %c\n", *cur);
  133. return -EINVAL;
  134. }
  135. return 0;
  136. }
  137. #define SUFFIX_HIGH 0
  138. #define SUFFIX_LOW 1
  139. #define SUFFIX_NULL 2
  140. static __initdata char *suffix_tbl[] = {
  141. [SUFFIX_HIGH] = ",high",
  142. [SUFFIX_LOW] = ",low",
  143. [SUFFIX_NULL] = NULL,
  144. };
  145. /*
  146. * That function parses "suffix" crashkernel command lines like
  147. *
  148. * crashkernel=size,[high|low]
  149. *
  150. * It returns 0 on success and -EINVAL on failure.
  151. */
  152. static int __init parse_crashkernel_suffix(char *cmdline,
  153. unsigned long long *crash_size,
  154. const char *suffix)
  155. {
  156. char *cur = cmdline;
  157. *crash_size = memparse(cmdline, &cur);
  158. if (cmdline == cur) {
  159. pr_warn("crashkernel: memory value expected\n");
  160. return -EINVAL;
  161. }
  162. /* check with suffix */
  163. if (strncmp(cur, suffix, strlen(suffix))) {
  164. pr_warn("crashkernel: unrecognized char: %c\n", *cur);
  165. return -EINVAL;
  166. }
  167. cur += strlen(suffix);
  168. if (*cur != ' ' && *cur != '\0') {
  169. pr_warn("crashkernel: unrecognized char: %c\n", *cur);
  170. return -EINVAL;
  171. }
  172. return 0;
  173. }
  174. static __init char *get_last_crashkernel(char *cmdline,
  175. const char *name,
  176. const char *suffix)
  177. {
  178. char *p = cmdline, *ck_cmdline = NULL;
  179. /* find crashkernel and use the last one if there are more */
  180. p = strstr(p, name);
  181. while (p) {
  182. char *end_p = strchr(p, ' ');
  183. char *q;
  184. if (!end_p)
  185. end_p = p + strlen(p);
  186. if (!suffix) {
  187. int i;
  188. /* skip the one with any known suffix */
  189. for (i = 0; suffix_tbl[i]; i++) {
  190. q = end_p - strlen(suffix_tbl[i]);
  191. if (!strncmp(q, suffix_tbl[i],
  192. strlen(suffix_tbl[i])))
  193. goto next;
  194. }
  195. ck_cmdline = p;
  196. } else {
  197. q = end_p - strlen(suffix);
  198. if (!strncmp(q, suffix, strlen(suffix)))
  199. ck_cmdline = p;
  200. }
  201. next:
  202. p = strstr(p+1, name);
  203. }
  204. return ck_cmdline;
  205. }
  206. static int __init __parse_crashkernel(char *cmdline,
  207. unsigned long long system_ram,
  208. unsigned long long *crash_size,
  209. unsigned long long *crash_base,
  210. const char *name,
  211. const char *suffix)
  212. {
  213. char *first_colon, *first_space;
  214. char *ck_cmdline;
  215. BUG_ON(!crash_size || !crash_base);
  216. *crash_size = 0;
  217. *crash_base = 0;
  218. ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
  219. if (!ck_cmdline)
  220. return -ENOENT;
  221. ck_cmdline += strlen(name);
  222. if (suffix)
  223. return parse_crashkernel_suffix(ck_cmdline, crash_size,
  224. suffix);
  225. /*
  226. * if the commandline contains a ':', then that's the extended
  227. * syntax -- if not, it must be the classic syntax
  228. */
  229. first_colon = strchr(ck_cmdline, ':');
  230. first_space = strchr(ck_cmdline, ' ');
  231. if (first_colon && (!first_space || first_colon < first_space))
  232. return parse_crashkernel_mem(ck_cmdline, system_ram,
  233. crash_size, crash_base);
  234. return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
  235. }
  236. /*
  237. * That function is the entry point for command line parsing and should be
  238. * called from the arch-specific code.
  239. */
  240. int __init parse_crashkernel(char *cmdline,
  241. unsigned long long system_ram,
  242. unsigned long long *crash_size,
  243. unsigned long long *crash_base)
  244. {
  245. return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
  246. "crashkernel=", NULL);
  247. }
  248. int __init parse_crashkernel_high(char *cmdline,
  249. unsigned long long system_ram,
  250. unsigned long long *crash_size,
  251. unsigned long long *crash_base)
  252. {
  253. return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
  254. "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
  255. }
  256. int __init parse_crashkernel_low(char *cmdline,
  257. unsigned long long system_ram,
  258. unsigned long long *crash_size,
  259. unsigned long long *crash_base)
  260. {
  261. return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
  262. "crashkernel=", suffix_tbl[SUFFIX_LOW]);
  263. }
  264. /*
  265. * Add a dummy early_param handler to mark crashkernel= as a known command line
  266. * parameter and suppress incorrect warnings in init/main.c.
  267. */
  268. static int __init parse_crashkernel_dummy(char *arg)
  269. {
  270. return 0;
  271. }
  272. early_param("crashkernel", parse_crashkernel_dummy);
  273. Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
  274. void *data, size_t data_len)
  275. {
  276. struct elf_note *note = (struct elf_note *)buf;
  277. note->n_namesz = strlen(name) + 1;
  278. note->n_descsz = data_len;
  279. note->n_type = type;
  280. buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
  281. memcpy(buf, name, note->n_namesz);
  282. buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
  283. memcpy(buf, data, data_len);
  284. buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
  285. return buf;
  286. }
  287. void final_note(Elf_Word *buf)
  288. {
  289. memset(buf, 0, sizeof(struct elf_note));
  290. }
  291. static void update_vmcoreinfo_note(void)
  292. {
  293. u32 *buf = vmcoreinfo_note;
  294. if (!vmcoreinfo_size)
  295. return;
  296. buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
  297. vmcoreinfo_size);
  298. final_note(buf);
  299. }
  300. void crash_update_vmcoreinfo_safecopy(void *ptr)
  301. {
  302. if (ptr)
  303. memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
  304. vmcoreinfo_data_safecopy = ptr;
  305. }
  306. void crash_save_vmcoreinfo(void)
  307. {
  308. if (!vmcoreinfo_note)
  309. return;
  310. /* Use the safe copy to generate vmcoreinfo note if have */
  311. if (vmcoreinfo_data_safecopy)
  312. vmcoreinfo_data = vmcoreinfo_data_safecopy;
  313. vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
  314. update_vmcoreinfo_note();
  315. }
  316. void vmcoreinfo_append_str(const char *fmt, ...)
  317. {
  318. va_list args;
  319. char buf[0x50];
  320. size_t r;
  321. va_start(args, fmt);
  322. r = vscnprintf(buf, sizeof(buf), fmt, args);
  323. va_end(args);
  324. r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
  325. memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
  326. vmcoreinfo_size += r;
  327. }
  328. /*
  329. * provide an empty default implementation here -- architecture
  330. * code may override this
  331. */
  332. void __weak arch_crash_save_vmcoreinfo(void)
  333. {}
  334. phys_addr_t __weak paddr_vmcoreinfo_note(void)
  335. {
  336. return __pa(vmcoreinfo_note);
  337. }
  338. EXPORT_SYMBOL(paddr_vmcoreinfo_note);
  339. static int __init crash_save_vmcoreinfo_init(void)
  340. {
  341. vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
  342. if (!vmcoreinfo_data) {
  343. pr_warn("Memory allocation for vmcoreinfo_data failed\n");
  344. return -ENOMEM;
  345. }
  346. vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
  347. GFP_KERNEL | __GFP_ZERO);
  348. if (!vmcoreinfo_note) {
  349. free_page((unsigned long)vmcoreinfo_data);
  350. vmcoreinfo_data = NULL;
  351. pr_warn("Memory allocation for vmcoreinfo_note failed\n");
  352. return -ENOMEM;
  353. }
  354. VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
  355. VMCOREINFO_BUILD_ID();
  356. VMCOREINFO_PAGESIZE(PAGE_SIZE);
  357. VMCOREINFO_SYMBOL(init_uts_ns);
  358. VMCOREINFO_OFFSET(uts_namespace, name);
  359. VMCOREINFO_SYMBOL(node_online_map);
  360. #ifdef CONFIG_MMU
  361. VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
  362. #endif
  363. VMCOREINFO_SYMBOL(_stext);
  364. VMCOREINFO_SYMBOL(vmap_area_list);
  365. #ifndef CONFIG_NUMA
  366. VMCOREINFO_SYMBOL(mem_map);
  367. VMCOREINFO_SYMBOL(contig_page_data);
  368. #endif
  369. #ifdef CONFIG_SPARSEMEM
  370. VMCOREINFO_SYMBOL_ARRAY(mem_section);
  371. VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
  372. VMCOREINFO_STRUCT_SIZE(mem_section);
  373. VMCOREINFO_OFFSET(mem_section, section_mem_map);
  374. VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
  375. VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
  376. #endif
  377. VMCOREINFO_STRUCT_SIZE(page);
  378. VMCOREINFO_STRUCT_SIZE(pglist_data);
  379. VMCOREINFO_STRUCT_SIZE(zone);
  380. VMCOREINFO_STRUCT_SIZE(free_area);
  381. VMCOREINFO_STRUCT_SIZE(list_head);
  382. VMCOREINFO_SIZE(nodemask_t);
  383. VMCOREINFO_OFFSET(page, flags);
  384. VMCOREINFO_OFFSET(page, _refcount);
  385. VMCOREINFO_OFFSET(page, mapping);
  386. VMCOREINFO_OFFSET(page, lru);
  387. VMCOREINFO_OFFSET(page, _mapcount);
  388. VMCOREINFO_OFFSET(page, private);
  389. VMCOREINFO_OFFSET(page, compound_dtor);
  390. VMCOREINFO_OFFSET(page, compound_order);
  391. VMCOREINFO_OFFSET(page, compound_head);
  392. VMCOREINFO_OFFSET(pglist_data, node_zones);
  393. VMCOREINFO_OFFSET(pglist_data, nr_zones);
  394. #ifdef CONFIG_FLATMEM
  395. VMCOREINFO_OFFSET(pglist_data, node_mem_map);
  396. #endif
  397. VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
  398. VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
  399. VMCOREINFO_OFFSET(pglist_data, node_id);
  400. VMCOREINFO_OFFSET(zone, free_area);
  401. VMCOREINFO_OFFSET(zone, vm_stat);
  402. VMCOREINFO_OFFSET(zone, spanned_pages);
  403. VMCOREINFO_OFFSET(free_area, free_list);
  404. VMCOREINFO_OFFSET(list_head, next);
  405. VMCOREINFO_OFFSET(list_head, prev);
  406. VMCOREINFO_OFFSET(vmap_area, va_start);
  407. VMCOREINFO_OFFSET(vmap_area, list);
  408. VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
  409. log_buf_vmcoreinfo_setup();
  410. VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
  411. VMCOREINFO_NUMBER(NR_FREE_PAGES);
  412. VMCOREINFO_NUMBER(PG_lru);
  413. VMCOREINFO_NUMBER(PG_private);
  414. VMCOREINFO_NUMBER(PG_swapcache);
  415. VMCOREINFO_NUMBER(PG_swapbacked);
  416. VMCOREINFO_NUMBER(PG_slab);
  417. #ifdef CONFIG_MEMORY_FAILURE
  418. VMCOREINFO_NUMBER(PG_hwpoison);
  419. #endif
  420. VMCOREINFO_NUMBER(PG_head_mask);
  421. #define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
  422. VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
  423. #ifdef CONFIG_HUGETLB_PAGE
  424. VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
  425. #define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
  426. VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
  427. #endif
  428. #ifdef CONFIG_KALLSYMS
  429. VMCOREINFO_SYMBOL(kallsyms_names);
  430. VMCOREINFO_SYMBOL(kallsyms_num_syms);
  431. VMCOREINFO_SYMBOL(kallsyms_token_table);
  432. VMCOREINFO_SYMBOL(kallsyms_token_index);
  433. #ifdef CONFIG_KALLSYMS_BASE_RELATIVE
  434. VMCOREINFO_SYMBOL(kallsyms_offsets);
  435. VMCOREINFO_SYMBOL(kallsyms_relative_base);
  436. #else
  437. VMCOREINFO_SYMBOL(kallsyms_addresses);
  438. #endif /* CONFIG_KALLSYMS_BASE_RELATIVE */
  439. #endif /* CONFIG_KALLSYMS */
  440. arch_crash_save_vmcoreinfo();
  441. update_vmcoreinfo_note();
  442. return 0;
  443. }
  444. subsys_initcall(crash_save_vmcoreinfo_init);