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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 HB |
8 | #include <linux/crash_core.h> |
9 | #include <linux/utsname.h> | |
10 | #include <linux/vmalloc.h> | |
11 | ||
12 | #include <asm/page.h> | |
13 | #include <asm/sections.h> | |
14 | ||
a24d22b2 | 15 | #include <crypto/sha1.h> |
0935288c | 16 | |
692f66f2 | 17 | /* vmcoreinfo stuff */ |
23c85094 OS |
18 | unsigned char *vmcoreinfo_data; |
19 | size_t vmcoreinfo_size; | |
203e9e41 | 20 | u32 *vmcoreinfo_note; |
692f66f2 | 21 | |
1229384f XP |
22 | /* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */ |
23 | static unsigned char *vmcoreinfo_data_safecopy; | |
24 | ||
692f66f2 HB |
25 | /* |
26 | * parsing the "crashkernel" commandline | |
27 | * | |
28 | * this code is intended to be called from architecture specific code | |
29 | */ | |
30 | ||
31 | ||
32 | /* | |
33 | * This function parses command lines in the format | |
34 | * | |
35 | * crashkernel=ramsize-range:size[,...][@offset] | |
36 | * | |
37 | * The function returns 0 on success and -EINVAL on failure. | |
38 | */ | |
39 | static int __init parse_crashkernel_mem(char *cmdline, | |
40 | unsigned long long system_ram, | |
41 | unsigned long long *crash_size, | |
42 | unsigned long long *crash_base) | |
43 | { | |
44 | char *cur = cmdline, *tmp; | |
45 | ||
46 | /* for each entry of the comma-separated list */ | |
47 | do { | |
48 | unsigned long long start, end = ULLONG_MAX, size; | |
49 | ||
50 | /* get the start of the range */ | |
51 | start = memparse(cur, &tmp); | |
52 | if (cur == tmp) { | |
53 | pr_warn("crashkernel: Memory value expected\n"); | |
54 | return -EINVAL; | |
55 | } | |
56 | cur = tmp; | |
57 | if (*cur != '-') { | |
58 | pr_warn("crashkernel: '-' expected\n"); | |
59 | return -EINVAL; | |
60 | } | |
61 | cur++; | |
62 | ||
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 | ||
77 | if (*cur != ':') { | |
78 | pr_warn("crashkernel: ':' expected\n"); | |
79 | return -EINVAL; | |
80 | } | |
81 | cur++; | |
82 | ||
83 | size = memparse(cur, &tmp); | |
84 | if (cur == tmp) { | |
85 | pr_warn("Memory value expected\n"); | |
86 | return -EINVAL; | |
87 | } | |
88 | cur = tmp; | |
89 | if (size >= system_ram) { | |
90 | pr_warn("crashkernel: invalid size\n"); | |
91 | return -EINVAL; | |
92 | } | |
93 | ||
94 | /* match ? */ | |
95 | if (system_ram >= start && system_ram < end) { | |
96 | *crash_size = size; | |
97 | break; | |
98 | } | |
99 | } while (*cur++ == ','); | |
100 | ||
101 | if (*crash_size > 0) { | |
102 | while (*cur && *cur != ' ' && *cur != '@') | |
103 | cur++; | |
104 | if (*cur == '@') { | |
105 | cur++; | |
106 | *crash_base = memparse(cur, &tmp); | |
107 | if (cur == tmp) { | |
108 | pr_warn("Memory value expected after '@'\n"); | |
109 | return -EINVAL; | |
110 | } | |
111 | } | |
de40ccef DY |
112 | } else |
113 | pr_info("crashkernel size resulted in zero bytes\n"); | |
692f66f2 HB |
114 | |
115 | return 0; | |
116 | } | |
117 | ||
118 | /* | |
119 | * That function parses "simple" (old) crashkernel command lines like | |
120 | * | |
121 | * crashkernel=size[@offset] | |
122 | * | |
123 | * It returns 0 on success and -EINVAL on failure. | |
124 | */ | |
125 | static int __init parse_crashkernel_simple(char *cmdline, | |
126 | unsigned long long *crash_size, | |
127 | unsigned long long *crash_base) | |
128 | { | |
129 | char *cur = cmdline; | |
130 | ||
131 | *crash_size = memparse(cmdline, &cur); | |
132 | if (cmdline == cur) { | |
133 | pr_warn("crashkernel: memory value expected\n"); | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
137 | if (*cur == '@') | |
138 | *crash_base = memparse(cur+1, &cur); | |
139 | else if (*cur != ' ' && *cur != '\0') { | |
140 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
141 | return -EINVAL; | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | #define SUFFIX_HIGH 0 | |
148 | #define SUFFIX_LOW 1 | |
149 | #define SUFFIX_NULL 2 | |
150 | static __initdata char *suffix_tbl[] = { | |
151 | [SUFFIX_HIGH] = ",high", | |
152 | [SUFFIX_LOW] = ",low", | |
153 | [SUFFIX_NULL] = NULL, | |
154 | }; | |
155 | ||
156 | /* | |
157 | * That function parses "suffix" crashkernel command lines like | |
158 | * | |
159 | * crashkernel=size,[high|low] | |
160 | * | |
161 | * It returns 0 on success and -EINVAL on failure. | |
162 | */ | |
163 | static int __init parse_crashkernel_suffix(char *cmdline, | |
164 | unsigned long long *crash_size, | |
165 | const char *suffix) | |
166 | { | |
167 | char *cur = cmdline; | |
168 | ||
169 | *crash_size = memparse(cmdline, &cur); | |
170 | if (cmdline == cur) { | |
171 | pr_warn("crashkernel: memory value expected\n"); | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | /* check with suffix */ | |
176 | if (strncmp(cur, suffix, strlen(suffix))) { | |
177 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
178 | return -EINVAL; | |
179 | } | |
180 | cur += strlen(suffix); | |
181 | if (*cur != ' ' && *cur != '\0') { | |
182 | pr_warn("crashkernel: unrecognized char: %c\n", *cur); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static __init char *get_last_crashkernel(char *cmdline, | |
190 | const char *name, | |
191 | const char *suffix) | |
192 | { | |
193 | char *p = cmdline, *ck_cmdline = NULL; | |
194 | ||
195 | /* find crashkernel and use the last one if there are more */ | |
196 | p = strstr(p, name); | |
197 | while (p) { | |
198 | char *end_p = strchr(p, ' '); | |
199 | char *q; | |
200 | ||
201 | if (!end_p) | |
202 | end_p = p + strlen(p); | |
203 | ||
204 | if (!suffix) { | |
205 | int i; | |
206 | ||
207 | /* skip the one with any known suffix */ | |
208 | for (i = 0; suffix_tbl[i]; i++) { | |
209 | q = end_p - strlen(suffix_tbl[i]); | |
210 | if (!strncmp(q, suffix_tbl[i], | |
211 | strlen(suffix_tbl[i]))) | |
212 | goto next; | |
213 | } | |
214 | ck_cmdline = p; | |
215 | } else { | |
216 | q = end_p - strlen(suffix); | |
217 | if (!strncmp(q, suffix, strlen(suffix))) | |
218 | ck_cmdline = p; | |
219 | } | |
220 | next: | |
221 | p = strstr(p+1, name); | |
222 | } | |
223 | ||
224 | if (!ck_cmdline) | |
225 | return NULL; | |
226 | ||
227 | return ck_cmdline; | |
228 | } | |
229 | ||
230 | static int __init __parse_crashkernel(char *cmdline, | |
231 | unsigned long long system_ram, | |
232 | unsigned long long *crash_size, | |
233 | unsigned long long *crash_base, | |
234 | const char *name, | |
235 | const char *suffix) | |
236 | { | |
237 | char *first_colon, *first_space; | |
238 | char *ck_cmdline; | |
239 | ||
240 | BUG_ON(!crash_size || !crash_base); | |
241 | *crash_size = 0; | |
242 | *crash_base = 0; | |
243 | ||
244 | ck_cmdline = get_last_crashkernel(cmdline, name, suffix); | |
245 | ||
246 | if (!ck_cmdline) | |
247 | return -EINVAL; | |
248 | ||
249 | ck_cmdline += strlen(name); | |
250 | ||
251 | if (suffix) | |
252 | return parse_crashkernel_suffix(ck_cmdline, crash_size, | |
253 | suffix); | |
254 | /* | |
255 | * if the commandline contains a ':', then that's the extended | |
256 | * syntax -- if not, it must be the classic syntax | |
257 | */ | |
258 | first_colon = strchr(ck_cmdline, ':'); | |
259 | first_space = strchr(ck_cmdline, ' '); | |
260 | if (first_colon && (!first_space || first_colon < first_space)) | |
261 | return parse_crashkernel_mem(ck_cmdline, system_ram, | |
262 | crash_size, crash_base); | |
263 | ||
264 | return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base); | |
265 | } | |
266 | ||
267 | /* | |
268 | * That function is the entry point for command line parsing and should be | |
269 | * called from the arch-specific code. | |
270 | */ | |
271 | int __init parse_crashkernel(char *cmdline, | |
272 | unsigned long long system_ram, | |
273 | unsigned long long *crash_size, | |
274 | unsigned long long *crash_base) | |
275 | { | |
276 | return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base, | |
277 | "crashkernel=", NULL); | |
278 | } | |
279 | ||
280 | int __init parse_crashkernel_high(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=", suffix_tbl[SUFFIX_HIGH]); | |
287 | } | |
288 | ||
289 | int __init parse_crashkernel_low(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_LOW]); | |
296 | } | |
297 | ||
51dbd925 HB |
298 | Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type, |
299 | void *data, size_t data_len) | |
692f66f2 | 300 | { |
51dbd925 HB |
301 | struct elf_note *note = (struct elf_note *)buf; |
302 | ||
303 | note->n_namesz = strlen(name) + 1; | |
304 | note->n_descsz = data_len; | |
305 | note->n_type = type; | |
306 | buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word)); | |
307 | memcpy(buf, name, note->n_namesz); | |
308 | buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word)); | |
309 | memcpy(buf, data, data_len); | |
310 | buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word)); | |
692f66f2 HB |
311 | |
312 | return buf; | |
313 | } | |
314 | ||
51dbd925 | 315 | void final_note(Elf_Word *buf) |
692f66f2 | 316 | { |
51dbd925 | 317 | memset(buf, 0, sizeof(struct elf_note)); |
692f66f2 HB |
318 | } |
319 | ||
320 | static void update_vmcoreinfo_note(void) | |
321 | { | |
322 | u32 *buf = vmcoreinfo_note; | |
323 | ||
324 | if (!vmcoreinfo_size) | |
325 | return; | |
326 | buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data, | |
327 | vmcoreinfo_size); | |
328 | final_note(buf); | |
329 | } | |
330 | ||
1229384f XP |
331 | void crash_update_vmcoreinfo_safecopy(void *ptr) |
332 | { | |
333 | if (ptr) | |
334 | memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size); | |
335 | ||
336 | vmcoreinfo_data_safecopy = ptr; | |
337 | } | |
338 | ||
692f66f2 HB |
339 | void crash_save_vmcoreinfo(void) |
340 | { | |
203e9e41 XP |
341 | if (!vmcoreinfo_note) |
342 | return; | |
343 | ||
1229384f XP |
344 | /* Use the safe copy to generate vmcoreinfo note if have */ |
345 | if (vmcoreinfo_data_safecopy) | |
346 | vmcoreinfo_data = vmcoreinfo_data_safecopy; | |
347 | ||
91bc9aaf | 348 | vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds()); |
692f66f2 HB |
349 | update_vmcoreinfo_note(); |
350 | } | |
351 | ||
352 | void vmcoreinfo_append_str(const char *fmt, ...) | |
353 | { | |
354 | va_list args; | |
355 | char buf[0x50]; | |
356 | size_t r; | |
357 | ||
358 | va_start(args, fmt); | |
359 | r = vscnprintf(buf, sizeof(buf), fmt, args); | |
360 | va_end(args); | |
361 | ||
5203f499 | 362 | r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size); |
692f66f2 HB |
363 | |
364 | memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r); | |
365 | ||
366 | vmcoreinfo_size += r; | |
367 | } | |
368 | ||
369 | /* | |
370 | * provide an empty default implementation here -- architecture | |
371 | * code may override this | |
372 | */ | |
373 | void __weak arch_crash_save_vmcoreinfo(void) | |
374 | {} | |
375 | ||
376 | phys_addr_t __weak paddr_vmcoreinfo_note(void) | |
377 | { | |
203e9e41 | 378 | return __pa(vmcoreinfo_note); |
692f66f2 | 379 | } |
43d4cb47 | 380 | EXPORT_SYMBOL(paddr_vmcoreinfo_note); |
692f66f2 HB |
381 | |
382 | static int __init crash_save_vmcoreinfo_init(void) | |
383 | { | |
203e9e41 XP |
384 | vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL); |
385 | if (!vmcoreinfo_data) { | |
386 | pr_warn("Memory allocation for vmcoreinfo_data failed\n"); | |
387 | return -ENOMEM; | |
388 | } | |
389 | ||
390 | vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE, | |
391 | GFP_KERNEL | __GFP_ZERO); | |
392 | if (!vmcoreinfo_note) { | |
393 | free_page((unsigned long)vmcoreinfo_data); | |
394 | vmcoreinfo_data = NULL; | |
395 | pr_warn("Memory allocation for vmcoreinfo_note failed\n"); | |
396 | return -ENOMEM; | |
397 | } | |
398 | ||
692f66f2 | 399 | VMCOREINFO_OSRELEASE(init_uts_ns.name.release); |
44e8a5e9 | 400 | VMCOREINFO_BUILD_ID(); |
692f66f2 HB |
401 | VMCOREINFO_PAGESIZE(PAGE_SIZE); |
402 | ||
403 | VMCOREINFO_SYMBOL(init_uts_ns); | |
ca4a9241 | 404 | VMCOREINFO_OFFSET(uts_namespace, name); |
692f66f2 HB |
405 | VMCOREINFO_SYMBOL(node_online_map); |
406 | #ifdef CONFIG_MMU | |
eff4345e | 407 | VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir); |
692f66f2 HB |
408 | #endif |
409 | VMCOREINFO_SYMBOL(_stext); | |
410 | VMCOREINFO_SYMBOL(vmap_area_list); | |
411 | ||
a9ee6cf5 | 412 | #ifndef CONFIG_NUMA |
692f66f2 HB |
413 | VMCOREINFO_SYMBOL(mem_map); |
414 | VMCOREINFO_SYMBOL(contig_page_data); | |
415 | #endif | |
416 | #ifdef CONFIG_SPARSEMEM | |
a0b12803 | 417 | VMCOREINFO_SYMBOL_ARRAY(mem_section); |
692f66f2 HB |
418 | VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); |
419 | VMCOREINFO_STRUCT_SIZE(mem_section); | |
420 | VMCOREINFO_OFFSET(mem_section, section_mem_map); | |
4f5aecdf | 421 | VMCOREINFO_NUMBER(SECTION_SIZE_BITS); |
1d50e5d0 | 422 | VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS); |
692f66f2 HB |
423 | #endif |
424 | VMCOREINFO_STRUCT_SIZE(page); | |
425 | VMCOREINFO_STRUCT_SIZE(pglist_data); | |
426 | VMCOREINFO_STRUCT_SIZE(zone); | |
427 | VMCOREINFO_STRUCT_SIZE(free_area); | |
428 | VMCOREINFO_STRUCT_SIZE(list_head); | |
429 | VMCOREINFO_SIZE(nodemask_t); | |
430 | VMCOREINFO_OFFSET(page, flags); | |
431 | VMCOREINFO_OFFSET(page, _refcount); | |
432 | VMCOREINFO_OFFSET(page, mapping); | |
433 | VMCOREINFO_OFFSET(page, lru); | |
434 | VMCOREINFO_OFFSET(page, _mapcount); | |
435 | VMCOREINFO_OFFSET(page, private); | |
436 | VMCOREINFO_OFFSET(page, compound_dtor); | |
437 | VMCOREINFO_OFFSET(page, compound_order); | |
438 | VMCOREINFO_OFFSET(page, compound_head); | |
439 | VMCOREINFO_OFFSET(pglist_data, node_zones); | |
440 | VMCOREINFO_OFFSET(pglist_data, nr_zones); | |
43b02ba9 | 441 | #ifdef CONFIG_FLATMEM |
692f66f2 HB |
442 | VMCOREINFO_OFFSET(pglist_data, node_mem_map); |
443 | #endif | |
444 | VMCOREINFO_OFFSET(pglist_data, node_start_pfn); | |
445 | VMCOREINFO_OFFSET(pglist_data, node_spanned_pages); | |
446 | VMCOREINFO_OFFSET(pglist_data, node_id); | |
447 | VMCOREINFO_OFFSET(zone, free_area); | |
448 | VMCOREINFO_OFFSET(zone, vm_stat); | |
449 | VMCOREINFO_OFFSET(zone, spanned_pages); | |
450 | VMCOREINFO_OFFSET(free_area, free_list); | |
451 | VMCOREINFO_OFFSET(list_head, next); | |
452 | VMCOREINFO_OFFSET(list_head, prev); | |
453 | VMCOREINFO_OFFSET(vmap_area, va_start); | |
454 | VMCOREINFO_OFFSET(vmap_area, list); | |
455 | VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER); | |
456 | log_buf_vmcoreinfo_setup(); | |
457 | VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES); | |
458 | VMCOREINFO_NUMBER(NR_FREE_PAGES); | |
459 | VMCOREINFO_NUMBER(PG_lru); | |
460 | VMCOREINFO_NUMBER(PG_private); | |
461 | VMCOREINFO_NUMBER(PG_swapcache); | |
1cbf29da | 462 | VMCOREINFO_NUMBER(PG_swapbacked); |
692f66f2 HB |
463 | VMCOREINFO_NUMBER(PG_slab); |
464 | #ifdef CONFIG_MEMORY_FAILURE | |
465 | VMCOREINFO_NUMBER(PG_hwpoison); | |
466 | #endif | |
467 | VMCOREINFO_NUMBER(PG_head_mask); | |
6e292b9b | 468 | #define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy) |
692f66f2 HB |
469 | VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE); |
470 | #ifdef CONFIG_HUGETLB_PAGE | |
471 | VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR); | |
e04b742f DH |
472 | #define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline) |
473 | VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE); | |
692f66f2 HB |
474 | #endif |
475 | ||
476 | arch_crash_save_vmcoreinfo(); | |
477 | update_vmcoreinfo_note(); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | subsys_initcall(crash_save_vmcoreinfo_init); |