Commit | Line | Data |
---|---|---|
666bfddb VG |
1 | /* |
2 | * fs/proc/vmcore.c Interface for accessing the crash | |
3 | * dump from the system's previous life. | |
4 | * Heavily borrowed from fs/proc/kcore.c | |
5 | * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) | |
6 | * Copyright (C) IBM Corporation, 2004. All rights reserved | |
7 | * | |
8 | */ | |
9 | ||
666bfddb VG |
10 | #include <linux/mm.h> |
11 | #include <linux/proc_fs.h> | |
12 | #include <linux/user.h> | |
666bfddb VG |
13 | #include <linux/elf.h> |
14 | #include <linux/elfcore.h> | |
666bfddb VG |
15 | #include <linux/highmem.h> |
16 | #include <linux/bootmem.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/crash_dump.h> | |
19 | #include <linux/list.h> | |
20 | #include <asm/uaccess.h> | |
21 | #include <asm/io.h> | |
22 | ||
23 | /* List representing chunks of contiguous memory areas and their offsets in | |
24 | * vmcore file. | |
25 | */ | |
26 | static LIST_HEAD(vmcore_list); | |
27 | ||
28 | /* Stores the pointer to the buffer containing kernel elf core headers. */ | |
29 | static char *elfcorebuf; | |
30 | static size_t elfcorebuf_sz; | |
31 | ||
32 | /* Total size of vmcore file. */ | |
33 | static u64 vmcore_size; | |
34 | ||
4ae362be VG |
35 | /* Stores the physical address of elf header of crash image. */ |
36 | unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; | |
37 | ||
666bfddb VG |
38 | struct proc_dir_entry *proc_vmcore = NULL; |
39 | ||
40 | /* Reads a page from the oldmem device from given offset. */ | |
41 | static ssize_t read_from_oldmem(char *buf, size_t count, | |
9e9e3941 | 42 | u64 *ppos, int userbuf) |
666bfddb VG |
43 | { |
44 | unsigned long pfn, offset; | |
45 | size_t nr_bytes; | |
46 | ssize_t read = 0, tmp; | |
47 | ||
48 | if (!count) | |
49 | return 0; | |
50 | ||
51 | offset = (unsigned long)(*ppos % PAGE_SIZE); | |
52 | pfn = (unsigned long)(*ppos / PAGE_SIZE); | |
53 | if (pfn > saved_max_pfn) | |
54 | return -EINVAL; | |
55 | ||
56 | do { | |
57 | if (count > (PAGE_SIZE - offset)) | |
58 | nr_bytes = PAGE_SIZE - offset; | |
59 | else | |
60 | nr_bytes = count; | |
61 | ||
62 | tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf); | |
63 | if (tmp < 0) | |
64 | return tmp; | |
65 | *ppos += nr_bytes; | |
66 | count -= nr_bytes; | |
67 | buf += nr_bytes; | |
68 | read += nr_bytes; | |
69 | ++pfn; | |
70 | offset = 0; | |
71 | } while (count); | |
72 | ||
73 | return read; | |
74 | } | |
75 | ||
76 | /* Maps vmcore file offset to respective physical address in memroy. */ | |
77 | static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list, | |
78 | struct vmcore **m_ptr) | |
79 | { | |
80 | struct vmcore *m; | |
81 | u64 paddr; | |
82 | ||
83 | list_for_each_entry(m, vc_list, list) { | |
84 | u64 start, end; | |
85 | start = m->offset; | |
86 | end = m->offset + m->size - 1; | |
87 | if (offset >= start && offset <= end) { | |
88 | paddr = m->paddr + offset - start; | |
89 | *m_ptr = m; | |
90 | return paddr; | |
91 | } | |
92 | } | |
93 | *m_ptr = NULL; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | /* Read from the ELF header and then the crash dump. On error, negative value is | |
98 | * returned otherwise number of bytes read are returned. | |
99 | */ | |
100 | static ssize_t read_vmcore(struct file *file, char __user *buffer, | |
101 | size_t buflen, loff_t *fpos) | |
102 | { | |
103 | ssize_t acc = 0, tmp; | |
80e8ff63 VG |
104 | size_t tsz; |
105 | u64 start, nr_bytes; | |
666bfddb VG |
106 | struct vmcore *curr_m = NULL; |
107 | ||
108 | if (buflen == 0 || *fpos >= vmcore_size) | |
109 | return 0; | |
110 | ||
111 | /* trim buflen to not go beyond EOF */ | |
112 | if (buflen > vmcore_size - *fpos) | |
113 | buflen = vmcore_size - *fpos; | |
114 | ||
115 | /* Read ELF core header */ | |
116 | if (*fpos < elfcorebuf_sz) { | |
117 | tsz = elfcorebuf_sz - *fpos; | |
118 | if (buflen < tsz) | |
119 | tsz = buflen; | |
120 | if (copy_to_user(buffer, elfcorebuf + *fpos, tsz)) | |
121 | return -EFAULT; | |
122 | buflen -= tsz; | |
123 | *fpos += tsz; | |
124 | buffer += tsz; | |
125 | acc += tsz; | |
126 | ||
127 | /* leave now if filled buffer already */ | |
128 | if (buflen == 0) | |
129 | return acc; | |
130 | } | |
131 | ||
132 | start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m); | |
133 | if (!curr_m) | |
134 | return -EINVAL; | |
135 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) | |
136 | tsz = buflen; | |
137 | ||
138 | /* Calculate left bytes in current memory segment. */ | |
139 | nr_bytes = (curr_m->size - (start - curr_m->paddr)); | |
140 | if (tsz > nr_bytes) | |
141 | tsz = nr_bytes; | |
142 | ||
143 | while (buflen) { | |
144 | tmp = read_from_oldmem(buffer, tsz, &start, 1); | |
145 | if (tmp < 0) | |
146 | return tmp; | |
147 | buflen -= tsz; | |
148 | *fpos += tsz; | |
149 | buffer += tsz; | |
150 | acc += tsz; | |
151 | if (start >= (curr_m->paddr + curr_m->size)) { | |
152 | if (curr_m->list.next == &vmcore_list) | |
153 | return acc; /*EOF*/ | |
154 | curr_m = list_entry(curr_m->list.next, | |
155 | struct vmcore, list); | |
156 | start = curr_m->paddr; | |
157 | } | |
158 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) | |
159 | tsz = buflen; | |
160 | /* Calculate left bytes in current memory segment. */ | |
161 | nr_bytes = (curr_m->size - (start - curr_m->paddr)); | |
162 | if (tsz > nr_bytes) | |
163 | tsz = nr_bytes; | |
164 | } | |
165 | return acc; | |
166 | } | |
167 | ||
4b6f5d20 | 168 | const struct file_operations proc_vmcore_operations = { |
666bfddb | 169 | .read = read_vmcore, |
666bfddb VG |
170 | }; |
171 | ||
172 | static struct vmcore* __init get_new_element(void) | |
173 | { | |
174 | struct vmcore *p; | |
175 | ||
176 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
177 | if (p) | |
178 | memset(p, 0, sizeof(*p)); | |
179 | return p; | |
180 | } | |
181 | ||
182 | static u64 __init get_vmcore_size_elf64(char *elfptr) | |
183 | { | |
184 | int i; | |
185 | u64 size; | |
186 | Elf64_Ehdr *ehdr_ptr; | |
187 | Elf64_Phdr *phdr_ptr; | |
188 | ||
189 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
190 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); | |
191 | size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr)); | |
192 | for (i = 0; i < ehdr_ptr->e_phnum; i++) { | |
193 | size += phdr_ptr->p_memsz; | |
194 | phdr_ptr++; | |
195 | } | |
196 | return size; | |
197 | } | |
198 | ||
72658e9d VG |
199 | static u64 __init get_vmcore_size_elf32(char *elfptr) |
200 | { | |
201 | int i; | |
202 | u64 size; | |
203 | Elf32_Ehdr *ehdr_ptr; | |
204 | Elf32_Phdr *phdr_ptr; | |
205 | ||
206 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
207 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); | |
208 | size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr)); | |
209 | for (i = 0; i < ehdr_ptr->e_phnum; i++) { | |
210 | size += phdr_ptr->p_memsz; | |
211 | phdr_ptr++; | |
212 | } | |
213 | return size; | |
214 | } | |
215 | ||
666bfddb VG |
216 | /* Merges all the PT_NOTE headers into one. */ |
217 | static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, | |
218 | struct list_head *vc_list) | |
219 | { | |
220 | int i, nr_ptnote=0, rc=0; | |
221 | char *tmp; | |
222 | Elf64_Ehdr *ehdr_ptr; | |
223 | Elf64_Phdr phdr, *phdr_ptr; | |
224 | Elf64_Nhdr *nhdr_ptr; | |
225 | u64 phdr_sz = 0, note_off; | |
226 | ||
227 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
228 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); | |
229 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
230 | int j; | |
231 | void *notes_section; | |
232 | struct vmcore *new; | |
233 | u64 offset, max_sz, sz, real_sz = 0; | |
234 | if (phdr_ptr->p_type != PT_NOTE) | |
235 | continue; | |
236 | nr_ptnote++; | |
237 | max_sz = phdr_ptr->p_memsz; | |
238 | offset = phdr_ptr->p_offset; | |
239 | notes_section = kmalloc(max_sz, GFP_KERNEL); | |
240 | if (!notes_section) | |
241 | return -ENOMEM; | |
242 | rc = read_from_oldmem(notes_section, max_sz, &offset, 0); | |
243 | if (rc < 0) { | |
244 | kfree(notes_section); | |
245 | return rc; | |
246 | } | |
247 | nhdr_ptr = notes_section; | |
248 | for (j = 0; j < max_sz; j += sz) { | |
249 | if (nhdr_ptr->n_namesz == 0) | |
250 | break; | |
251 | sz = sizeof(Elf64_Nhdr) + | |
252 | ((nhdr_ptr->n_namesz + 3) & ~3) + | |
253 | ((nhdr_ptr->n_descsz + 3) & ~3); | |
254 | real_sz += sz; | |
255 | nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz); | |
256 | } | |
257 | ||
258 | /* Add this contiguous chunk of notes section to vmcore list.*/ | |
259 | new = get_new_element(); | |
260 | if (!new) { | |
261 | kfree(notes_section); | |
262 | return -ENOMEM; | |
263 | } | |
264 | new->paddr = phdr_ptr->p_offset; | |
265 | new->size = real_sz; | |
266 | list_add_tail(&new->list, vc_list); | |
267 | phdr_sz += real_sz; | |
268 | kfree(notes_section); | |
269 | } | |
270 | ||
271 | /* Prepare merged PT_NOTE program header. */ | |
272 | phdr.p_type = PT_NOTE; | |
273 | phdr.p_flags = 0; | |
274 | note_off = sizeof(Elf64_Ehdr) + | |
275 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr); | |
276 | phdr.p_offset = note_off; | |
277 | phdr.p_vaddr = phdr.p_paddr = 0; | |
278 | phdr.p_filesz = phdr.p_memsz = phdr_sz; | |
279 | phdr.p_align = 0; | |
280 | ||
281 | /* Add merged PT_NOTE program header*/ | |
282 | tmp = elfptr + sizeof(Elf64_Ehdr); | |
283 | memcpy(tmp, &phdr, sizeof(phdr)); | |
284 | tmp += sizeof(phdr); | |
285 | ||
286 | /* Remove unwanted PT_NOTE program headers. */ | |
287 | i = (nr_ptnote - 1) * sizeof(Elf64_Phdr); | |
288 | *elfsz = *elfsz - i; | |
289 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr))); | |
290 | ||
291 | /* Modify e_phnum to reflect merged headers. */ | |
292 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
72658e9d VG |
297 | /* Merges all the PT_NOTE headers into one. */ |
298 | static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz, | |
299 | struct list_head *vc_list) | |
300 | { | |
301 | int i, nr_ptnote=0, rc=0; | |
302 | char *tmp; | |
303 | Elf32_Ehdr *ehdr_ptr; | |
304 | Elf32_Phdr phdr, *phdr_ptr; | |
305 | Elf32_Nhdr *nhdr_ptr; | |
306 | u64 phdr_sz = 0, note_off; | |
307 | ||
308 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
309 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); | |
310 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
311 | int j; | |
312 | void *notes_section; | |
313 | struct vmcore *new; | |
314 | u64 offset, max_sz, sz, real_sz = 0; | |
315 | if (phdr_ptr->p_type != PT_NOTE) | |
316 | continue; | |
317 | nr_ptnote++; | |
318 | max_sz = phdr_ptr->p_memsz; | |
319 | offset = phdr_ptr->p_offset; | |
320 | notes_section = kmalloc(max_sz, GFP_KERNEL); | |
321 | if (!notes_section) | |
322 | return -ENOMEM; | |
323 | rc = read_from_oldmem(notes_section, max_sz, &offset, 0); | |
324 | if (rc < 0) { | |
325 | kfree(notes_section); | |
326 | return rc; | |
327 | } | |
328 | nhdr_ptr = notes_section; | |
329 | for (j = 0; j < max_sz; j += sz) { | |
330 | if (nhdr_ptr->n_namesz == 0) | |
331 | break; | |
332 | sz = sizeof(Elf32_Nhdr) + | |
333 | ((nhdr_ptr->n_namesz + 3) & ~3) + | |
334 | ((nhdr_ptr->n_descsz + 3) & ~3); | |
335 | real_sz += sz; | |
336 | nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz); | |
337 | } | |
338 | ||
339 | /* Add this contiguous chunk of notes section to vmcore list.*/ | |
340 | new = get_new_element(); | |
341 | if (!new) { | |
342 | kfree(notes_section); | |
343 | return -ENOMEM; | |
344 | } | |
345 | new->paddr = phdr_ptr->p_offset; | |
346 | new->size = real_sz; | |
347 | list_add_tail(&new->list, vc_list); | |
348 | phdr_sz += real_sz; | |
349 | kfree(notes_section); | |
350 | } | |
351 | ||
352 | /* Prepare merged PT_NOTE program header. */ | |
353 | phdr.p_type = PT_NOTE; | |
354 | phdr.p_flags = 0; | |
355 | note_off = sizeof(Elf32_Ehdr) + | |
356 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr); | |
357 | phdr.p_offset = note_off; | |
358 | phdr.p_vaddr = phdr.p_paddr = 0; | |
359 | phdr.p_filesz = phdr.p_memsz = phdr_sz; | |
360 | phdr.p_align = 0; | |
361 | ||
362 | /* Add merged PT_NOTE program header*/ | |
363 | tmp = elfptr + sizeof(Elf32_Ehdr); | |
364 | memcpy(tmp, &phdr, sizeof(phdr)); | |
365 | tmp += sizeof(phdr); | |
366 | ||
367 | /* Remove unwanted PT_NOTE program headers. */ | |
368 | i = (nr_ptnote - 1) * sizeof(Elf32_Phdr); | |
369 | *elfsz = *elfsz - i; | |
370 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr))); | |
371 | ||
372 | /* Modify e_phnum to reflect merged headers. */ | |
373 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
666bfddb VG |
378 | /* Add memory chunks represented by program headers to vmcore list. Also update |
379 | * the new offset fields of exported program headers. */ | |
380 | static int __init process_ptload_program_headers_elf64(char *elfptr, | |
381 | size_t elfsz, | |
382 | struct list_head *vc_list) | |
383 | { | |
384 | int i; | |
385 | Elf64_Ehdr *ehdr_ptr; | |
386 | Elf64_Phdr *phdr_ptr; | |
387 | loff_t vmcore_off; | |
388 | struct vmcore *new; | |
389 | ||
390 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
391 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */ | |
392 | ||
393 | /* First program header is PT_NOTE header. */ | |
394 | vmcore_off = sizeof(Elf64_Ehdr) + | |
395 | (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) + | |
396 | phdr_ptr->p_memsz; /* Note sections */ | |
397 | ||
398 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
399 | if (phdr_ptr->p_type != PT_LOAD) | |
400 | continue; | |
401 | ||
402 | /* Add this contiguous chunk of memory to vmcore list.*/ | |
403 | new = get_new_element(); | |
404 | if (!new) | |
405 | return -ENOMEM; | |
406 | new->paddr = phdr_ptr->p_offset; | |
407 | new->size = phdr_ptr->p_memsz; | |
408 | list_add_tail(&new->list, vc_list); | |
409 | ||
410 | /* Update the program header offset. */ | |
411 | phdr_ptr->p_offset = vmcore_off; | |
412 | vmcore_off = vmcore_off + phdr_ptr->p_memsz; | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
72658e9d VG |
417 | static int __init process_ptload_program_headers_elf32(char *elfptr, |
418 | size_t elfsz, | |
419 | struct list_head *vc_list) | |
420 | { | |
421 | int i; | |
422 | Elf32_Ehdr *ehdr_ptr; | |
423 | Elf32_Phdr *phdr_ptr; | |
424 | loff_t vmcore_off; | |
425 | struct vmcore *new; | |
426 | ||
427 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
428 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */ | |
429 | ||
430 | /* First program header is PT_NOTE header. */ | |
431 | vmcore_off = sizeof(Elf32_Ehdr) + | |
432 | (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) + | |
433 | phdr_ptr->p_memsz; /* Note sections */ | |
434 | ||
435 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
436 | if (phdr_ptr->p_type != PT_LOAD) | |
437 | continue; | |
438 | ||
439 | /* Add this contiguous chunk of memory to vmcore list.*/ | |
440 | new = get_new_element(); | |
441 | if (!new) | |
442 | return -ENOMEM; | |
443 | new->paddr = phdr_ptr->p_offset; | |
444 | new->size = phdr_ptr->p_memsz; | |
445 | list_add_tail(&new->list, vc_list); | |
446 | ||
447 | /* Update the program header offset */ | |
448 | phdr_ptr->p_offset = vmcore_off; | |
449 | vmcore_off = vmcore_off + phdr_ptr->p_memsz; | |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
666bfddb VG |
454 | /* Sets offset fields of vmcore elements. */ |
455 | static void __init set_vmcore_list_offsets_elf64(char *elfptr, | |
456 | struct list_head *vc_list) | |
457 | { | |
458 | loff_t vmcore_off; | |
459 | Elf64_Ehdr *ehdr_ptr; | |
460 | struct vmcore *m; | |
461 | ||
462 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
463 | ||
464 | /* Skip Elf header and program headers. */ | |
465 | vmcore_off = sizeof(Elf64_Ehdr) + | |
466 | (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr); | |
467 | ||
468 | list_for_each_entry(m, vc_list, list) { | |
469 | m->offset = vmcore_off; | |
470 | vmcore_off += m->size; | |
471 | } | |
472 | } | |
473 | ||
72658e9d VG |
474 | /* Sets offset fields of vmcore elements. */ |
475 | static void __init set_vmcore_list_offsets_elf32(char *elfptr, | |
476 | struct list_head *vc_list) | |
477 | { | |
478 | loff_t vmcore_off; | |
479 | Elf32_Ehdr *ehdr_ptr; | |
480 | struct vmcore *m; | |
481 | ||
482 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
483 | ||
484 | /* Skip Elf header and program headers. */ | |
485 | vmcore_off = sizeof(Elf32_Ehdr) + | |
486 | (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr); | |
487 | ||
488 | list_for_each_entry(m, vc_list, list) { | |
489 | m->offset = vmcore_off; | |
490 | vmcore_off += m->size; | |
491 | } | |
492 | } | |
493 | ||
666bfddb VG |
494 | static int __init parse_crash_elf64_headers(void) |
495 | { | |
496 | int rc=0; | |
497 | Elf64_Ehdr ehdr; | |
498 | u64 addr; | |
499 | ||
500 | addr = elfcorehdr_addr; | |
501 | ||
502 | /* Read Elf header */ | |
503 | rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0); | |
504 | if (rc < 0) | |
505 | return rc; | |
506 | ||
507 | /* Do some basic Verification. */ | |
508 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || | |
509 | (ehdr.e_type != ET_CORE) || | |
79e03011 | 510 | !vmcore_elf_check_arch(&ehdr) || |
666bfddb VG |
511 | ehdr.e_ident[EI_CLASS] != ELFCLASS64 || |
512 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || | |
513 | ehdr.e_version != EV_CURRENT || | |
514 | ehdr.e_ehsize != sizeof(Elf64_Ehdr) || | |
515 | ehdr.e_phentsize != sizeof(Elf64_Phdr) || | |
516 | ehdr.e_phnum == 0) { | |
517 | printk(KERN_WARNING "Warning: Core image elf header is not" | |
518 | "sane\n"); | |
519 | return -EINVAL; | |
520 | } | |
521 | ||
522 | /* Read in all elf headers. */ | |
523 | elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr); | |
524 | elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL); | |
525 | if (!elfcorebuf) | |
526 | return -ENOMEM; | |
527 | addr = elfcorehdr_addr; | |
528 | rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0); | |
529 | if (rc < 0) { | |
530 | kfree(elfcorebuf); | |
531 | return rc; | |
532 | } | |
533 | ||
534 | /* Merge all PT_NOTE headers into one. */ | |
535 | rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list); | |
536 | if (rc) { | |
537 | kfree(elfcorebuf); | |
538 | return rc; | |
539 | } | |
540 | rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz, | |
541 | &vmcore_list); | |
542 | if (rc) { | |
543 | kfree(elfcorebuf); | |
544 | return rc; | |
545 | } | |
546 | set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list); | |
547 | return 0; | |
548 | } | |
549 | ||
72658e9d VG |
550 | static int __init parse_crash_elf32_headers(void) |
551 | { | |
552 | int rc=0; | |
553 | Elf32_Ehdr ehdr; | |
554 | u64 addr; | |
555 | ||
556 | addr = elfcorehdr_addr; | |
557 | ||
558 | /* Read Elf header */ | |
559 | rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0); | |
560 | if (rc < 0) | |
561 | return rc; | |
562 | ||
563 | /* Do some basic Verification. */ | |
564 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || | |
565 | (ehdr.e_type != ET_CORE) || | |
566 | !elf_check_arch(&ehdr) || | |
567 | ehdr.e_ident[EI_CLASS] != ELFCLASS32|| | |
568 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || | |
569 | ehdr.e_version != EV_CURRENT || | |
570 | ehdr.e_ehsize != sizeof(Elf32_Ehdr) || | |
571 | ehdr.e_phentsize != sizeof(Elf32_Phdr) || | |
572 | ehdr.e_phnum == 0) { | |
573 | printk(KERN_WARNING "Warning: Core image elf header is not" | |
574 | "sane\n"); | |
575 | return -EINVAL; | |
576 | } | |
577 | ||
578 | /* Read in all elf headers. */ | |
579 | elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr); | |
580 | elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL); | |
581 | if (!elfcorebuf) | |
582 | return -ENOMEM; | |
583 | addr = elfcorehdr_addr; | |
584 | rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0); | |
585 | if (rc < 0) { | |
586 | kfree(elfcorebuf); | |
587 | return rc; | |
588 | } | |
589 | ||
590 | /* Merge all PT_NOTE headers into one. */ | |
591 | rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list); | |
592 | if (rc) { | |
593 | kfree(elfcorebuf); | |
594 | return rc; | |
595 | } | |
596 | rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz, | |
597 | &vmcore_list); | |
598 | if (rc) { | |
599 | kfree(elfcorebuf); | |
600 | return rc; | |
601 | } | |
602 | set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list); | |
603 | return 0; | |
604 | } | |
605 | ||
666bfddb VG |
606 | static int __init parse_crash_elf_headers(void) |
607 | { | |
608 | unsigned char e_ident[EI_NIDENT]; | |
609 | u64 addr; | |
610 | int rc=0; | |
611 | ||
612 | addr = elfcorehdr_addr; | |
613 | rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0); | |
614 | if (rc < 0) | |
615 | return rc; | |
616 | if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) { | |
617 | printk(KERN_WARNING "Warning: Core image elf header" | |
618 | " not found\n"); | |
619 | return -EINVAL; | |
620 | } | |
621 | ||
622 | if (e_ident[EI_CLASS] == ELFCLASS64) { | |
623 | rc = parse_crash_elf64_headers(); | |
624 | if (rc) | |
625 | return rc; | |
626 | ||
627 | /* Determine vmcore size. */ | |
628 | vmcore_size = get_vmcore_size_elf64(elfcorebuf); | |
72658e9d VG |
629 | } else if (e_ident[EI_CLASS] == ELFCLASS32) { |
630 | rc = parse_crash_elf32_headers(); | |
631 | if (rc) | |
632 | return rc; | |
633 | ||
634 | /* Determine vmcore size. */ | |
635 | vmcore_size = get_vmcore_size_elf32(elfcorebuf); | |
666bfddb VG |
636 | } else { |
637 | printk(KERN_WARNING "Warning: Core image elf header is not" | |
638 | " sane\n"); | |
639 | return -EINVAL; | |
640 | } | |
641 | return 0; | |
642 | } | |
643 | ||
644 | /* Init function for vmcore module. */ | |
645 | static int __init vmcore_init(void) | |
646 | { | |
647 | int rc = 0; | |
648 | ||
649 | /* If elfcorehdr= has been passed in cmdline, then capture the dump.*/ | |
650 | if (!(elfcorehdr_addr < ELFCORE_ADDR_MAX)) | |
651 | return rc; | |
652 | rc = parse_crash_elf_headers(); | |
653 | if (rc) { | |
654 | printk(KERN_WARNING "Kdump: vmcore not initialized\n"); | |
655 | return rc; | |
656 | } | |
657 | ||
658 | /* Initialize /proc/vmcore size if proc is already up. */ | |
659 | if (proc_vmcore) | |
660 | proc_vmcore->size = vmcore_size; | |
661 | return 0; | |
662 | } | |
663 | module_init(vmcore_init) |