Commit | Line | Data |
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40b0b3f8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
692f66f2 HB |
2 | /* |
3 | * crash.c - kernel crash support code. | |
4 | * Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com> | |
692f66f2 HB |
5 | */ |
6 | ||
44e8a5e9 | 7 | #include <linux/buildid.h> |
692f66f2 | 8 | #include <linux/crash_core.h> |
71d2bcec | 9 | #include <linux/init.h> |
692f66f2 HB |
10 | #include <linux/utsname.h> |
11 | #include <linux/vmalloc.h> | |
46d36b1b | 12 | #include <linux/sizes.h> |
692f66f2 HB |
13 | |
14 | #include <asm/page.h> | |
15 | #include <asm/sections.h> | |
16 | ||
a24d22b2 | 17 | #include <crypto/sha1.h> |
0935288c | 18 | |
5fd8fea9 SB |
19 | #include "kallsyms_internal.h" |
20 | ||
692f66f2 | 21 | /* vmcoreinfo stuff */ |
23c85094 OS |
22 | unsigned char *vmcoreinfo_data; |
23 | size_t vmcoreinfo_size; | |
203e9e41 | 24 | u32 *vmcoreinfo_note; |
692f66f2 | 25 | |
1229384f XP |
26 | /* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */ |
27 | static unsigned char *vmcoreinfo_data_safecopy; | |
28 | ||
692f66f2 HB |
29 | /* |
30 | * parsing the "crashkernel" commandline | |
31 | * | |
32 | * this code is intended to be called from architecture specific code | |
33 | */ | |
34 | ||
35 | ||
36 | /* | |
37 | * This function parses command lines in the format | |
38 | * | |
39 | * crashkernel=ramsize-range:size[,...][@offset] | |
40 | * | |
41 | * The function returns 0 on success and -EINVAL on failure. | |
42 | */ | |
43 | static int __init parse_crashkernel_mem(char *cmdline, | |
44 | unsigned long long system_ram, | |
45 | unsigned long long *crash_size, | |
46 | unsigned long long *crash_base) | |
47 | { | |
48 | char *cur = cmdline, *tmp; | |
46d36b1b TL |
49 | unsigned long long total_mem = system_ram; |
50 | ||
51 | /* | |
52 | * Firmware sometimes reserves some memory regions for its own use, | |
53 | * so the system memory size is less than the actual physical memory | |
54 | * size. Work around this by rounding up the total size to 128M, | |
55 | * which is enough for most test cases. | |
56 | */ | |
57 | total_mem = roundup(total_mem, SZ_128M); | |
692f66f2 HB |
58 | |
59 | /* for each entry of the comma-separated list */ | |
60 | do { | |
61 | unsigned long long start, end = ULLONG_MAX, size; | |
62 | ||
63 | /* get the start of the range */ | |
64 | start = memparse(cur, &tmp); | |
65 | if (cur == tmp) { | |
66 | pr_warn("crashkernel: Memory value expected\n"); | |
67 | return -EINVAL; | |
68 | } | |
69 | cur = tmp; | |
70 | if (*cur != '-') { | |
71 | pr_warn("crashkernel: '-' expected\n"); | |
72 | return -EINVAL; | |
73 | } | |
74 | cur++; | |
75 | ||
76 | /* if no ':' is here, than we read the end */ | |
77 | if (*cur != ':') { | |
78 | end = memparse(cur, &tmp); | |
79 | if (cur == tmp) { | |
80 | pr_warn("crashkernel: Memory value expected\n"); | |
81 | return -EINVAL; | |
82 | } | |
83 | cur = tmp; | |
84 | if (end <= start) { | |
85 | pr_warn("crashkernel: end <= start\n"); | |
86 | return -EINVAL; | |
87 | } | |
88 | } | |
89 | ||
90 | if (*cur != ':') { | |
91 | pr_warn("crashkernel: ':' expected\n"); | |
92 | return -EINVAL; | |
93 | } | |
94 | cur++; | |
95 | ||
96 | size = memparse(cur, &tmp); | |
97 | if (cur == tmp) { | |
98 | pr_warn("Memory value expected\n"); | |
99 | return -EINVAL; | |
100 | } | |
101 | cur = tmp; | |
46d36b1b | 102 | if (size >= total_mem) { |
692f66f2 HB |
103 | pr_warn("crashkernel: invalid size\n"); |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | /* match ? */ | |
46d36b1b | 108 | if (total_mem >= start && total_mem < end) { |
692f66f2 HB |
109 | *crash_size = size; |
110 | break; | |
111 | } | |
112 | } while (*cur++ == ','); | |
113 | ||
114 | if (*crash_size > 0) { | |
115 | while (*cur && *cur != ' ' && *cur != '@') | |
116 | cur++; | |
117 | if (*cur == '@') { | |
118 | cur++; | |
119 | *crash_base = memparse(cur, &tmp); | |
120 | if (cur == tmp) { | |
121 | pr_warn("Memory value expected after '@'\n"); | |
122 | return -EINVAL; | |
123 | } | |
124 | } | |
de40ccef DY |
125 | } else |
126 | pr_info("crashkernel size resulted in zero bytes\n"); | |
692f66f2 HB |
127 | |
128 | return 0; | |
129 | } | |
130 | ||
131 | /* | |
132 | * That function parses "simple" (old) crashkernel command lines like | |
133 | * | |
134 | * crashkernel=size[@offset] | |
135 | * | |
136 | * It returns 0 on success and -EINVAL on failure. | |
137 | */ | |
138 | static int __init parse_crashkernel_simple(char *cmdline, | |
139 | unsigned long long *crash_size, | |
140 | unsigned long long *crash_base) | |
141 | { | |
142 | char *cur = cmdline; | |
143 | ||
144 | *crash_size = memparse(cmdline, &cur); | |
145 | if (cmdline == cur) { | |
146 | pr_warn("crashkernel: memory value expected\n"); | |
147 | return -EINVAL; | |
148 | } | |
149 | ||
150 | if (*cur == '@') | |
151 | *crash_base = memparse(cur+1, &cur); | |
152 | else if (*cur != ' ' && *cur != '\0') { | |
153 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | #define SUFFIX_HIGH 0 | |
161 | #define SUFFIX_LOW 1 | |
162 | #define SUFFIX_NULL 2 | |
163 | static __initdata char *suffix_tbl[] = { | |
164 | [SUFFIX_HIGH] = ",high", | |
165 | [SUFFIX_LOW] = ",low", | |
166 | [SUFFIX_NULL] = NULL, | |
167 | }; | |
168 | ||
169 | /* | |
170 | * That function parses "suffix" crashkernel command lines like | |
171 | * | |
172 | * crashkernel=size,[high|low] | |
173 | * | |
174 | * It returns 0 on success and -EINVAL on failure. | |
175 | */ | |
176 | static int __init parse_crashkernel_suffix(char *cmdline, | |
177 | unsigned long long *crash_size, | |
178 | const char *suffix) | |
179 | { | |
180 | char *cur = cmdline; | |
181 | ||
182 | *crash_size = memparse(cmdline, &cur); | |
183 | if (cmdline == cur) { | |
184 | pr_warn("crashkernel: memory value expected\n"); | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
188 | /* check with suffix */ | |
189 | if (strncmp(cur, suffix, strlen(suffix))) { | |
190 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
191 | return -EINVAL; | |
192 | } | |
193 | cur += strlen(suffix); | |
194 | if (*cur != ' ' && *cur != '\0') { | |
195 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
196 | return -EINVAL; | |
197 | } | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static __init char *get_last_crashkernel(char *cmdline, | |
203 | const char *name, | |
204 | const char *suffix) | |
205 | { | |
206 | char *p = cmdline, *ck_cmdline = NULL; | |
207 | ||
208 | /* find crashkernel and use the last one if there are more */ | |
209 | p = strstr(p, name); | |
210 | while (p) { | |
211 | char *end_p = strchr(p, ' '); | |
212 | char *q; | |
213 | ||
214 | if (!end_p) | |
215 | end_p = p + strlen(p); | |
216 | ||
217 | if (!suffix) { | |
218 | int i; | |
219 | ||
220 | /* skip the one with any known suffix */ | |
221 | for (i = 0; suffix_tbl[i]; i++) { | |
222 | q = end_p - strlen(suffix_tbl[i]); | |
223 | if (!strncmp(q, suffix_tbl[i], | |
224 | strlen(suffix_tbl[i]))) | |
225 | goto next; | |
226 | } | |
227 | ck_cmdline = p; | |
228 | } else { | |
229 | q = end_p - strlen(suffix); | |
230 | if (!strncmp(q, suffix, strlen(suffix))) | |
231 | ck_cmdline = p; | |
232 | } | |
233 | next: | |
234 | p = strstr(p+1, name); | |
235 | } | |
236 | ||
692f66f2 HB |
237 | return ck_cmdline; |
238 | } | |
239 | ||
240 | static 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 | const char *name, | |
245 | const char *suffix) | |
246 | { | |
247 | char *first_colon, *first_space; | |
248 | char *ck_cmdline; | |
249 | ||
250 | BUG_ON(!crash_size || !crash_base); | |
251 | *crash_size = 0; | |
252 | *crash_base = 0; | |
253 | ||
254 | ck_cmdline = get_last_crashkernel(cmdline, name, suffix); | |
692f66f2 | 255 | if (!ck_cmdline) |
2e5920bb | 256 | return -ENOENT; |
692f66f2 HB |
257 | |
258 | ck_cmdline += strlen(name); | |
259 | ||
260 | if (suffix) | |
261 | return parse_crashkernel_suffix(ck_cmdline, crash_size, | |
262 | suffix); | |
263 | /* | |
264 | * if the commandline contains a ':', then that's the extended | |
265 | * syntax -- if not, it must be the classic syntax | |
266 | */ | |
267 | first_colon = strchr(ck_cmdline, ':'); | |
268 | first_space = strchr(ck_cmdline, ' '); | |
269 | if (first_colon && (!first_space || first_colon < first_space)) | |
270 | return parse_crashkernel_mem(ck_cmdline, system_ram, | |
271 | crash_size, crash_base); | |
272 | ||
273 | return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base); | |
274 | } | |
275 | ||
276 | /* | |
277 | * That function is the entry point for command line parsing and should be | |
278 | * called from the arch-specific code. | |
279 | */ | |
280 | int __init parse_crashkernel(char *cmdline, | |
281 | unsigned long long system_ram, | |
282 | unsigned long long *crash_size, | |
283 | unsigned long long *crash_base) | |
284 | { | |
285 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
286 | "crashkernel=", NULL); | |
287 | } | |
288 | ||
289 | int __init parse_crashkernel_high(char *cmdline, | |
290 | unsigned long long system_ram, | |
291 | unsigned long long *crash_size, | |
292 | unsigned long long *crash_base) | |
293 | { | |
294 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
295 | "crashkernel=", suffix_tbl[SUFFIX_HIGH]); | |
296 | } | |
297 | ||
298 | int __init parse_crashkernel_low(char *cmdline, | |
299 | unsigned long long system_ram, | |
300 | unsigned long long *crash_size, | |
301 | unsigned long long *crash_base) | |
302 | { | |
303 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
304 | "crashkernel=", suffix_tbl[SUFFIX_LOW]); | |
305 | } | |
306 | ||
71d2bcec PR |
307 | /* |
308 | * Add a dummy early_param handler to mark crashkernel= as a known command line | |
309 | * parameter and suppress incorrect warnings in init/main.c. | |
310 | */ | |
311 | static int __init parse_crashkernel_dummy(char *arg) | |
312 | { | |
313 | return 0; | |
314 | } | |
315 | early_param("crashkernel", parse_crashkernel_dummy); | |
316 | ||
51dbd925 HB |
317 | Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, |
318 | void *data, size_t data_len) | |
692f66f2 | 319 | { |
51dbd925 HB |
320 | struct elf_note *note = (struct elf_note *)buf; |
321 | ||
322 | note->n_namesz = strlen(name) + 1; | |
323 | note->n_descsz = data_len; | |
324 | note->n_type = type; | |
325 | buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word)); | |
326 | memcpy(buf, name, note->n_namesz); | |
327 | buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word)); | |
328 | memcpy(buf, data, data_len); | |
329 | buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word)); | |
692f66f2 HB |
330 | |
331 | return buf; | |
332 | } | |
333 | ||
51dbd925 | 334 | void final_note(Elf_Word *buf) |
692f66f2 | 335 | { |
51dbd925 | 336 | memset(buf, 0, sizeof(struct elf_note)); |
692f66f2 HB |
337 | } |
338 | ||
339 | static void update_vmcoreinfo_note(void) | |
340 | { | |
341 | u32 *buf = vmcoreinfo_note; | |
342 | ||
343 | if (!vmcoreinfo_size) | |
344 | return; | |
345 | buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data, | |
346 | vmcoreinfo_size); | |
347 | final_note(buf); | |
348 | } | |
349 | ||
1229384f XP |
350 | void crash_update_vmcoreinfo_safecopy(void *ptr) |
351 | { | |
352 | if (ptr) | |
353 | memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size); | |
354 | ||
355 | vmcoreinfo_data_safecopy = ptr; | |
356 | } | |
357 | ||
692f66f2 HB |
358 | void crash_save_vmcoreinfo(void) |
359 | { | |
203e9e41 XP |
360 | if (!vmcoreinfo_note) |
361 | return; | |
362 | ||
1229384f XP |
363 | /* Use the safe copy to generate vmcoreinfo note if have */ |
364 | if (vmcoreinfo_data_safecopy) | |
365 | vmcoreinfo_data = vmcoreinfo_data_safecopy; | |
366 | ||
91bc9aaf | 367 | vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds()); |
692f66f2 HB |
368 | update_vmcoreinfo_note(); |
369 | } | |
370 | ||
371 | void vmcoreinfo_append_str(const char *fmt, ...) | |
372 | { | |
373 | va_list args; | |
374 | char buf[0x50]; | |
375 | size_t r; | |
376 | ||
377 | va_start(args, fmt); | |
378 | r = vscnprintf(buf, sizeof(buf), fmt, args); | |
379 | va_end(args); | |
380 | ||
5203f499 | 381 | r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size); |
692f66f2 HB |
382 | |
383 | memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r); | |
384 | ||
385 | vmcoreinfo_size += r; | |
08fc35f3 SB |
386 | |
387 | WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES, | |
388 | "vmcoreinfo data exceeds allocated size, truncating"); | |
692f66f2 HB |
389 | } |
390 | ||
391 | /* | |
392 | * provide an empty default implementation here -- architecture | |
393 | * code may override this | |
394 | */ | |
395 | void __weak arch_crash_save_vmcoreinfo(void) | |
396 | {} | |
397 | ||
398 | phys_addr_t __weak paddr_vmcoreinfo_note(void) | |
399 | { | |
203e9e41 | 400 | return __pa(vmcoreinfo_note); |
692f66f2 | 401 | } |
43d4cb47 | 402 | EXPORT_SYMBOL(paddr_vmcoreinfo_note); |
692f66f2 HB |
403 | |
404 | static int __init crash_save_vmcoreinfo_init(void) | |
405 | { | |
203e9e41 XP |
406 | vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL); |
407 | if (!vmcoreinfo_data) { | |
408 | pr_warn("Memory allocation for vmcoreinfo_data failed\n"); | |
409 | return -ENOMEM; | |
410 | } | |
411 | ||
412 | vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE, | |
413 | GFP_KERNEL | __GFP_ZERO); | |
414 | if (!vmcoreinfo_note) { | |
415 | free_page((unsigned long)vmcoreinfo_data); | |
416 | vmcoreinfo_data = NULL; | |
417 | pr_warn("Memory allocation for vmcoreinfo_note failed\n"); | |
418 | return -ENOMEM; | |
419 | } | |
420 | ||
692f66f2 | 421 | VMCOREINFO_OSRELEASE(init_uts_ns.name.release); |
44e8a5e9 | 422 | VMCOREINFO_BUILD_ID(); |
692f66f2 HB |
423 | VMCOREINFO_PAGESIZE(PAGE_SIZE); |
424 | ||
425 | VMCOREINFO_SYMBOL(init_uts_ns); | |
ca4a9241 | 426 | VMCOREINFO_OFFSET(uts_namespace, name); |
692f66f2 HB |
427 | VMCOREINFO_SYMBOL(node_online_map); |
428 | #ifdef CONFIG_MMU | |
eff4345e | 429 | VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir); |
692f66f2 HB |
430 | #endif |
431 | VMCOREINFO_SYMBOL(_stext); | |
432 | VMCOREINFO_SYMBOL(vmap_area_list); | |
433 | ||
a9ee6cf5 | 434 | #ifndef CONFIG_NUMA |
692f66f2 HB |
435 | VMCOREINFO_SYMBOL(mem_map); |
436 | VMCOREINFO_SYMBOL(contig_page_data); | |
437 | #endif | |
438 | #ifdef CONFIG_SPARSEMEM | |
a0b12803 | 439 | VMCOREINFO_SYMBOL_ARRAY(mem_section); |
692f66f2 HB |
440 | VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); |
441 | VMCOREINFO_STRUCT_SIZE(mem_section); | |
442 | VMCOREINFO_OFFSET(mem_section, section_mem_map); | |
4f5aecdf | 443 | VMCOREINFO_NUMBER(SECTION_SIZE_BITS); |
1d50e5d0 | 444 | VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS); |
692f66f2 HB |
445 | #endif |
446 | VMCOREINFO_STRUCT_SIZE(page); | |
447 | VMCOREINFO_STRUCT_SIZE(pglist_data); | |
448 | VMCOREINFO_STRUCT_SIZE(zone); | |
449 | VMCOREINFO_STRUCT_SIZE(free_area); | |
450 | VMCOREINFO_STRUCT_SIZE(list_head); | |
451 | VMCOREINFO_SIZE(nodemask_t); | |
452 | VMCOREINFO_OFFSET(page, flags); | |
453 | VMCOREINFO_OFFSET(page, _refcount); | |
454 | VMCOREINFO_OFFSET(page, mapping); | |
455 | VMCOREINFO_OFFSET(page, lru); | |
456 | VMCOREINFO_OFFSET(page, _mapcount); | |
457 | VMCOREINFO_OFFSET(page, private); | |
1c5509be MWO |
458 | VMCOREINFO_OFFSET(folio, _folio_dtor); |
459 | VMCOREINFO_OFFSET(folio, _folio_order); | |
692f66f2 HB |
460 | VMCOREINFO_OFFSET(page, compound_head); |
461 | VMCOREINFO_OFFSET(pglist_data, node_zones); | |
462 | VMCOREINFO_OFFSET(pglist_data, nr_zones); | |
43b02ba9 | 463 | #ifdef CONFIG_FLATMEM |
692f66f2 HB |
464 | VMCOREINFO_OFFSET(pglist_data, node_mem_map); |
465 | #endif | |
466 | VMCOREINFO_OFFSET(pglist_data, node_start_pfn); | |
467 | VMCOREINFO_OFFSET(pglist_data, node_spanned_pages); | |
468 | VMCOREINFO_OFFSET(pglist_data, node_id); | |
469 | VMCOREINFO_OFFSET(zone, free_area); | |
470 | VMCOREINFO_OFFSET(zone, vm_stat); | |
471 | VMCOREINFO_OFFSET(zone, spanned_pages); | |
472 | VMCOREINFO_OFFSET(free_area, free_list); | |
473 | VMCOREINFO_OFFSET(list_head, next); | |
474 | VMCOREINFO_OFFSET(list_head, prev); | |
475 | VMCOREINFO_OFFSET(vmap_area, va_start); | |
476 | VMCOREINFO_OFFSET(vmap_area, list); | |
477 | VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER); | |
478 | log_buf_vmcoreinfo_setup(); | |
479 | VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES); | |
480 | VMCOREINFO_NUMBER(NR_FREE_PAGES); | |
481 | VMCOREINFO_NUMBER(PG_lru); | |
482 | VMCOREINFO_NUMBER(PG_private); | |
483 | VMCOREINFO_NUMBER(PG_swapcache); | |
1cbf29da | 484 | VMCOREINFO_NUMBER(PG_swapbacked); |
692f66f2 HB |
485 | VMCOREINFO_NUMBER(PG_slab); |
486 | #ifdef CONFIG_MEMORY_FAILURE | |
487 | VMCOREINFO_NUMBER(PG_hwpoison); | |
488 | #endif | |
489 | VMCOREINFO_NUMBER(PG_head_mask); | |
6e292b9b | 490 | #define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy) |
692f66f2 HB |
491 | VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); |
492 | #ifdef CONFIG_HUGETLB_PAGE | |
493 | VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR); | |
e04b742f DH |
494 | #define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline) |
495 | VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE); | |
692f66f2 HB |
496 | #endif |
497 | ||
5fd8fea9 SB |
498 | #ifdef CONFIG_KALLSYMS |
499 | VMCOREINFO_SYMBOL(kallsyms_names); | |
f09bddbd | 500 | VMCOREINFO_SYMBOL(kallsyms_num_syms); |
5fd8fea9 SB |
501 | VMCOREINFO_SYMBOL(kallsyms_token_table); |
502 | VMCOREINFO_SYMBOL(kallsyms_token_index); | |
503 | #ifdef CONFIG_KALLSYMS_BASE_RELATIVE | |
504 | VMCOREINFO_SYMBOL(kallsyms_offsets); | |
505 | VMCOREINFO_SYMBOL(kallsyms_relative_base); | |
506 | #else | |
507 | VMCOREINFO_SYMBOL(kallsyms_addresses); | |
508 | #endif /* CONFIG_KALLSYMS_BASE_RELATIVE */ | |
509 | #endif /* CONFIG_KALLSYMS */ | |
510 | ||
692f66f2 HB |
511 | arch_crash_save_vmcoreinfo(); |
512 | update_vmcoreinfo_note(); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | subsys_initcall(crash_save_vmcoreinfo_init); |