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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> | |
12 | ||
13 | #include <asm/page.h> | |
14 | #include <asm/sections.h> | |
15 | ||
a24d22b2 | 16 | #include <crypto/sha1.h> |
0935288c | 17 | |
692f66f2 | 18 | /* vmcoreinfo stuff */ |
23c85094 OS |
19 | unsigned char *vmcoreinfo_data; |
20 | size_t vmcoreinfo_size; | |
203e9e41 | 21 | u32 *vmcoreinfo_note; |
692f66f2 | 22 | |
1229384f XP |
23 | /* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */ |
24 | static unsigned char *vmcoreinfo_data_safecopy; | |
25 | ||
692f66f2 HB |
26 | /* |
27 | * parsing the "crashkernel" commandline | |
28 | * | |
29 | * this code is intended to be called from architecture specific code | |
30 | */ | |
31 | ||
32 | ||
33 | /* | |
34 | * This function parses command lines in the format | |
35 | * | |
36 | * crashkernel=ramsize-range:size[,...][@offset] | |
37 | * | |
38 | * The function returns 0 on success and -EINVAL on failure. | |
39 | */ | |
40 | static int __init parse_crashkernel_mem(char *cmdline, | |
41 | unsigned long long system_ram, | |
42 | unsigned long long *crash_size, | |
43 | unsigned long long *crash_base) | |
44 | { | |
45 | char *cur = cmdline, *tmp; | |
46 | ||
47 | /* for each entry of the comma-separated list */ | |
48 | do { | |
49 | unsigned long long start, end = ULLONG_MAX, size; | |
50 | ||
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 | ||
64 | /* if no ':' is here, than we read the end */ | |
65 | if (*cur != ':') { | |
66 | end = memparse(cur, &tmp); | |
67 | if (cur == tmp) { | |
68 | pr_warn("crashkernel: Memory value expected\n"); | |
69 | return -EINVAL; | |
70 | } | |
71 | cur = tmp; | |
72 | if (end <= start) { | |
73 | pr_warn("crashkernel: end <= start\n"); | |
74 | return -EINVAL; | |
75 | } | |
76 | } | |
77 | ||
78 | if (*cur != ':') { | |
79 | pr_warn("crashkernel: ':' expected\n"); | |
80 | return -EINVAL; | |
81 | } | |
82 | cur++; | |
83 | ||
84 | size = memparse(cur, &tmp); | |
85 | if (cur == tmp) { | |
86 | pr_warn("Memory value expected\n"); | |
87 | return -EINVAL; | |
88 | } | |
89 | cur = tmp; | |
90 | if (size >= system_ram) { | |
91 | pr_warn("crashkernel: invalid size\n"); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | /* match ? */ | |
96 | if (system_ram >= start && system_ram < end) { | |
97 | *crash_size = size; | |
98 | break; | |
99 | } | |
100 | } while (*cur++ == ','); | |
101 | ||
102 | if (*crash_size > 0) { | |
103 | while (*cur && *cur != ' ' && *cur != '@') | |
104 | cur++; | |
105 | if (*cur == '@') { | |
106 | cur++; | |
107 | *crash_base = memparse(cur, &tmp); | |
108 | if (cur == tmp) { | |
109 | pr_warn("Memory value expected after '@'\n"); | |
110 | return -EINVAL; | |
111 | } | |
112 | } | |
de40ccef DY |
113 | } else |
114 | pr_info("crashkernel size resulted in zero bytes\n"); | |
692f66f2 HB |
115 | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* | |
120 | * That function parses "simple" (old) crashkernel command lines like | |
121 | * | |
122 | * crashkernel=size[@offset] | |
123 | * | |
124 | * It returns 0 on success and -EINVAL on failure. | |
125 | */ | |
126 | static int __init parse_crashkernel_simple(char *cmdline, | |
127 | unsigned long long *crash_size, | |
128 | unsigned long long *crash_base) | |
129 | { | |
130 | char *cur = cmdline; | |
131 | ||
132 | *crash_size = memparse(cmdline, &cur); | |
133 | if (cmdline == cur) { | |
134 | pr_warn("crashkernel: memory value expected\n"); | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | if (*cur == '@') | |
139 | *crash_base = memparse(cur+1, &cur); | |
140 | else if (*cur != ' ' && *cur != '\0') { | |
141 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | #define SUFFIX_HIGH 0 | |
149 | #define SUFFIX_LOW 1 | |
150 | #define SUFFIX_NULL 2 | |
151 | static __initdata char *suffix_tbl[] = { | |
152 | [SUFFIX_HIGH] = ",high", | |
153 | [SUFFIX_LOW] = ",low", | |
154 | [SUFFIX_NULL] = NULL, | |
155 | }; | |
156 | ||
157 | /* | |
158 | * That function parses "suffix" crashkernel command lines like | |
159 | * | |
160 | * crashkernel=size,[high|low] | |
161 | * | |
162 | * It returns 0 on success and -EINVAL on failure. | |
163 | */ | |
164 | static int __init parse_crashkernel_suffix(char *cmdline, | |
165 | unsigned long long *crash_size, | |
166 | const char *suffix) | |
167 | { | |
168 | char *cur = cmdline; | |
169 | ||
170 | *crash_size = memparse(cmdline, &cur); | |
171 | if (cmdline == cur) { | |
172 | pr_warn("crashkernel: memory value expected\n"); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | /* check with suffix */ | |
177 | if (strncmp(cur, suffix, strlen(suffix))) { | |
178 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
179 | return -EINVAL; | |
180 | } | |
181 | cur += strlen(suffix); | |
182 | if (*cur != ' ' && *cur != '\0') { | |
183 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static __init char *get_last_crashkernel(char *cmdline, | |
191 | const char *name, | |
192 | const char *suffix) | |
193 | { | |
194 | char *p = cmdline, *ck_cmdline = NULL; | |
195 | ||
196 | /* find crashkernel and use the last one if there are more */ | |
197 | p = strstr(p, name); | |
198 | while (p) { | |
199 | char *end_p = strchr(p, ' '); | |
200 | char *q; | |
201 | ||
202 | if (!end_p) | |
203 | end_p = p + strlen(p); | |
204 | ||
205 | if (!suffix) { | |
206 | int i; | |
207 | ||
208 | /* skip the one with any known suffix */ | |
209 | for (i = 0; suffix_tbl[i]; i++) { | |
210 | q = end_p - strlen(suffix_tbl[i]); | |
211 | if (!strncmp(q, suffix_tbl[i], | |
212 | strlen(suffix_tbl[i]))) | |
213 | goto next; | |
214 | } | |
215 | ck_cmdline = p; | |
216 | } else { | |
217 | q = end_p - strlen(suffix); | |
218 | if (!strncmp(q, suffix, strlen(suffix))) | |
219 | ck_cmdline = p; | |
220 | } | |
221 | next: | |
222 | p = strstr(p+1, name); | |
223 | } | |
224 | ||
692f66f2 HB |
225 | return ck_cmdline; |
226 | } | |
227 | ||
228 | static int __init __parse_crashkernel(char *cmdline, | |
229 | unsigned long long system_ram, | |
230 | unsigned long long *crash_size, | |
231 | unsigned long long *crash_base, | |
232 | const char *name, | |
233 | const char *suffix) | |
234 | { | |
235 | char *first_colon, *first_space; | |
236 | char *ck_cmdline; | |
237 | ||
238 | BUG_ON(!crash_size || !crash_base); | |
239 | *crash_size = 0; | |
240 | *crash_base = 0; | |
241 | ||
242 | ck_cmdline = get_last_crashkernel(cmdline, name, suffix); | |
692f66f2 | 243 | if (!ck_cmdline) |
2e5920bb | 244 | return -ENOENT; |
692f66f2 HB |
245 | |
246 | ck_cmdline += strlen(name); | |
247 | ||
248 | if (suffix) | |
249 | return parse_crashkernel_suffix(ck_cmdline, crash_size, | |
250 | suffix); | |
251 | /* | |
252 | * if the commandline contains a ':', then that's the extended | |
253 | * syntax -- if not, it must be the classic syntax | |
254 | */ | |
255 | first_colon = strchr(ck_cmdline, ':'); | |
256 | first_space = strchr(ck_cmdline, ' '); | |
257 | if (first_colon && (!first_space || first_colon < first_space)) | |
258 | return parse_crashkernel_mem(ck_cmdline, system_ram, | |
259 | crash_size, crash_base); | |
260 | ||
261 | return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base); | |
262 | } | |
263 | ||
264 | /* | |
265 | * That function is the entry point for command line parsing and should be | |
266 | * called from the arch-specific code. | |
267 | */ | |
268 | int __init parse_crashkernel(char *cmdline, | |
269 | unsigned long long system_ram, | |
270 | unsigned long long *crash_size, | |
271 | unsigned long long *crash_base) | |
272 | { | |
273 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
274 | "crashkernel=", NULL); | |
275 | } | |
276 | ||
277 | int __init parse_crashkernel_high(char *cmdline, | |
278 | unsigned long long system_ram, | |
279 | unsigned long long *crash_size, | |
280 | unsigned long long *crash_base) | |
281 | { | |
282 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
283 | "crashkernel=", suffix_tbl[SUFFIX_HIGH]); | |
284 | } | |
285 | ||
286 | int __init parse_crashkernel_low(char *cmdline, | |
287 | unsigned long long system_ram, | |
288 | unsigned long long *crash_size, | |
289 | unsigned long long *crash_base) | |
290 | { | |
291 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
292 | "crashkernel=", suffix_tbl[SUFFIX_LOW]); | |
293 | } | |
294 | ||
71d2bcec PR |
295 | /* |
296 | * Add a dummy early_param handler to mark crashkernel= as a known command line | |
297 | * parameter and suppress incorrect warnings in init/main.c. | |
298 | */ | |
299 | static int __init parse_crashkernel_dummy(char *arg) | |
300 | { | |
301 | return 0; | |
302 | } | |
303 | early_param("crashkernel", parse_crashkernel_dummy); | |
304 | ||
51dbd925 HB |
305 | Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, |
306 | void *data, size_t data_len) | |
692f66f2 | 307 | { |
51dbd925 HB |
308 | struct elf_note *note = (struct elf_note *)buf; |
309 | ||
310 | note->n_namesz = strlen(name) + 1; | |
311 | note->n_descsz = data_len; | |
312 | note->n_type = type; | |
313 | buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word)); | |
314 | memcpy(buf, name, note->n_namesz); | |
315 | buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word)); | |
316 | memcpy(buf, data, data_len); | |
317 | buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word)); | |
692f66f2 HB |
318 | |
319 | return buf; | |
320 | } | |
321 | ||
51dbd925 | 322 | void final_note(Elf_Word *buf) |
692f66f2 | 323 | { |
51dbd925 | 324 | memset(buf, 0, sizeof(struct elf_note)); |
692f66f2 HB |
325 | } |
326 | ||
327 | static void update_vmcoreinfo_note(void) | |
328 | { | |
329 | u32 *buf = vmcoreinfo_note; | |
330 | ||
331 | if (!vmcoreinfo_size) | |
332 | return; | |
333 | buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data, | |
334 | vmcoreinfo_size); | |
335 | final_note(buf); | |
336 | } | |
337 | ||
1229384f XP |
338 | void crash_update_vmcoreinfo_safecopy(void *ptr) |
339 | { | |
340 | if (ptr) | |
341 | memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size); | |
342 | ||
343 | vmcoreinfo_data_safecopy = ptr; | |
344 | } | |
345 | ||
692f66f2 HB |
346 | void crash_save_vmcoreinfo(void) |
347 | { | |
203e9e41 XP |
348 | if (!vmcoreinfo_note) |
349 | return; | |
350 | ||
1229384f XP |
351 | /* Use the safe copy to generate vmcoreinfo note if have */ |
352 | if (vmcoreinfo_data_safecopy) | |
353 | vmcoreinfo_data = vmcoreinfo_data_safecopy; | |
354 | ||
91bc9aaf | 355 | vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds()); |
692f66f2 HB |
356 | update_vmcoreinfo_note(); |
357 | } | |
358 | ||
359 | void vmcoreinfo_append_str(const char *fmt, ...) | |
360 | { | |
361 | va_list args; | |
362 | char buf[0x50]; | |
363 | size_t r; | |
364 | ||
365 | va_start(args, fmt); | |
366 | r = vscnprintf(buf, sizeof(buf), fmt, args); | |
367 | va_end(args); | |
368 | ||
5203f499 | 369 | r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size); |
692f66f2 HB |
370 | |
371 | memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r); | |
372 | ||
373 | vmcoreinfo_size += r; | |
374 | } | |
375 | ||
376 | /* | |
377 | * provide an empty default implementation here -- architecture | |
378 | * code may override this | |
379 | */ | |
380 | void __weak arch_crash_save_vmcoreinfo(void) | |
381 | {} | |
382 | ||
383 | phys_addr_t __weak paddr_vmcoreinfo_note(void) | |
384 | { | |
203e9e41 | 385 | return __pa(vmcoreinfo_note); |
692f66f2 | 386 | } |
43d4cb47 | 387 | EXPORT_SYMBOL(paddr_vmcoreinfo_note); |
692f66f2 HB |
388 | |
389 | static int __init crash_save_vmcoreinfo_init(void) | |
390 | { | |
203e9e41 XP |
391 | vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL); |
392 | if (!vmcoreinfo_data) { | |
393 | pr_warn("Memory allocation for vmcoreinfo_data failed\n"); | |
394 | return -ENOMEM; | |
395 | } | |
396 | ||
397 | vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE, | |
398 | GFP_KERNEL | __GFP_ZERO); | |
399 | if (!vmcoreinfo_note) { | |
400 | free_page((unsigned long)vmcoreinfo_data); | |
401 | vmcoreinfo_data = NULL; | |
402 | pr_warn("Memory allocation for vmcoreinfo_note failed\n"); | |
403 | return -ENOMEM; | |
404 | } | |
405 | ||
692f66f2 | 406 | VMCOREINFO_OSRELEASE(init_uts_ns.name.release); |
44e8a5e9 | 407 | VMCOREINFO_BUILD_ID(); |
692f66f2 HB |
408 | VMCOREINFO_PAGESIZE(PAGE_SIZE); |
409 | ||
410 | VMCOREINFO_SYMBOL(init_uts_ns); | |
ca4a9241 | 411 | VMCOREINFO_OFFSET(uts_namespace, name); |
692f66f2 HB |
412 | VMCOREINFO_SYMBOL(node_online_map); |
413 | #ifdef CONFIG_MMU | |
eff4345e | 414 | VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir); |
692f66f2 HB |
415 | #endif |
416 | VMCOREINFO_SYMBOL(_stext); | |
417 | VMCOREINFO_SYMBOL(vmap_area_list); | |
418 | ||
a9ee6cf5 | 419 | #ifndef CONFIG_NUMA |
692f66f2 HB |
420 | VMCOREINFO_SYMBOL(mem_map); |
421 | VMCOREINFO_SYMBOL(contig_page_data); | |
422 | #endif | |
423 | #ifdef CONFIG_SPARSEMEM | |
a0b12803 | 424 | VMCOREINFO_SYMBOL_ARRAY(mem_section); |
692f66f2 HB |
425 | VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); |
426 | VMCOREINFO_STRUCT_SIZE(mem_section); | |
427 | VMCOREINFO_OFFSET(mem_section, section_mem_map); | |
4f5aecdf | 428 | VMCOREINFO_NUMBER(SECTION_SIZE_BITS); |
1d50e5d0 | 429 | VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS); |
692f66f2 HB |
430 | #endif |
431 | VMCOREINFO_STRUCT_SIZE(page); | |
432 | VMCOREINFO_STRUCT_SIZE(pglist_data); | |
433 | VMCOREINFO_STRUCT_SIZE(zone); | |
434 | VMCOREINFO_STRUCT_SIZE(free_area); | |
435 | VMCOREINFO_STRUCT_SIZE(list_head); | |
436 | VMCOREINFO_SIZE(nodemask_t); | |
437 | VMCOREINFO_OFFSET(page, flags); | |
438 | VMCOREINFO_OFFSET(page, _refcount); | |
439 | VMCOREINFO_OFFSET(page, mapping); | |
440 | VMCOREINFO_OFFSET(page, lru); | |
441 | VMCOREINFO_OFFSET(page, _mapcount); | |
442 | VMCOREINFO_OFFSET(page, private); | |
443 | VMCOREINFO_OFFSET(page, compound_dtor); | |
444 | VMCOREINFO_OFFSET(page, compound_order); | |
445 | VMCOREINFO_OFFSET(page, compound_head); | |
446 | VMCOREINFO_OFFSET(pglist_data, node_zones); | |
447 | VMCOREINFO_OFFSET(pglist_data, nr_zones); | |
43b02ba9 | 448 | #ifdef CONFIG_FLATMEM |
692f66f2 HB |
449 | VMCOREINFO_OFFSET(pglist_data, node_mem_map); |
450 | #endif | |
451 | VMCOREINFO_OFFSET(pglist_data, node_start_pfn); | |
452 | VMCOREINFO_OFFSET(pglist_data, node_spanned_pages); | |
453 | VMCOREINFO_OFFSET(pglist_data, node_id); | |
454 | VMCOREINFO_OFFSET(zone, free_area); | |
455 | VMCOREINFO_OFFSET(zone, vm_stat); | |
456 | VMCOREINFO_OFFSET(zone, spanned_pages); | |
457 | VMCOREINFO_OFFSET(free_area, free_list); | |
458 | VMCOREINFO_OFFSET(list_head, next); | |
459 | VMCOREINFO_OFFSET(list_head, prev); | |
460 | VMCOREINFO_OFFSET(vmap_area, va_start); | |
461 | VMCOREINFO_OFFSET(vmap_area, list); | |
462 | VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER); | |
463 | log_buf_vmcoreinfo_setup(); | |
464 | VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES); | |
465 | VMCOREINFO_NUMBER(NR_FREE_PAGES); | |
466 | VMCOREINFO_NUMBER(PG_lru); | |
467 | VMCOREINFO_NUMBER(PG_private); | |
468 | VMCOREINFO_NUMBER(PG_swapcache); | |
1cbf29da | 469 | VMCOREINFO_NUMBER(PG_swapbacked); |
692f66f2 HB |
470 | VMCOREINFO_NUMBER(PG_slab); |
471 | #ifdef CONFIG_MEMORY_FAILURE | |
472 | VMCOREINFO_NUMBER(PG_hwpoison); | |
473 | #endif | |
474 | VMCOREINFO_NUMBER(PG_head_mask); | |
6e292b9b | 475 | #define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy) |
692f66f2 HB |
476 | VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); |
477 | #ifdef CONFIG_HUGETLB_PAGE | |
478 | VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR); | |
e04b742f DH |
479 | #define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline) |
480 | VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE); | |
692f66f2 HB |
481 | #endif |
482 | ||
483 | arch_crash_save_vmcoreinfo(); | |
484 | update_vmcoreinfo_note(); | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | subsys_initcall(crash_save_vmcoreinfo_init); |