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> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
666bfddb VG |
16 | #include <linux/highmem.h> |
17 | #include <linux/bootmem.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/crash_dump.h> | |
20 | #include <linux/list.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/io.h> | |
23 | ||
24 | /* List representing chunks of contiguous memory areas and their offsets in | |
25 | * vmcore file. | |
26 | */ | |
27 | static LIST_HEAD(vmcore_list); | |
28 | ||
29 | /* Stores the pointer to the buffer containing kernel elf core headers. */ | |
30 | static char *elfcorebuf; | |
31 | static size_t elfcorebuf_sz; | |
32 | ||
33 | /* Total size of vmcore file. */ | |
34 | static u64 vmcore_size; | |
35 | ||
5aa140c2 | 36 | static struct proc_dir_entry *proc_vmcore = NULL; |
666bfddb VG |
37 | |
38 | /* Reads a page from the oldmem device from given offset. */ | |
39 | static ssize_t read_from_oldmem(char *buf, size_t count, | |
9e9e3941 | 40 | u64 *ppos, int userbuf) |
666bfddb VG |
41 | { |
42 | unsigned long pfn, offset; | |
43 | size_t nr_bytes; | |
44 | ssize_t read = 0, tmp; | |
45 | ||
46 | if (!count) | |
47 | return 0; | |
48 | ||
49 | offset = (unsigned long)(*ppos % PAGE_SIZE); | |
50 | pfn = (unsigned long)(*ppos / PAGE_SIZE); | |
666bfddb VG |
51 | |
52 | do { | |
53 | if (count > (PAGE_SIZE - offset)) | |
54 | nr_bytes = PAGE_SIZE - offset; | |
55 | else | |
56 | nr_bytes = count; | |
57 | ||
58 | tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf); | |
59 | if (tmp < 0) | |
60 | return tmp; | |
61 | *ppos += nr_bytes; | |
62 | count -= nr_bytes; | |
63 | buf += nr_bytes; | |
64 | read += nr_bytes; | |
65 | ++pfn; | |
66 | offset = 0; | |
67 | } while (count); | |
68 | ||
69 | return read; | |
70 | } | |
71 | ||
72 | /* Maps vmcore file offset to respective physical address in memroy. */ | |
73 | static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list, | |
74 | struct vmcore **m_ptr) | |
75 | { | |
76 | struct vmcore *m; | |
77 | u64 paddr; | |
78 | ||
79 | list_for_each_entry(m, vc_list, list) { | |
80 | u64 start, end; | |
81 | start = m->offset; | |
82 | end = m->offset + m->size - 1; | |
83 | if (offset >= start && offset <= end) { | |
84 | paddr = m->paddr + offset - start; | |
85 | *m_ptr = m; | |
86 | return paddr; | |
87 | } | |
88 | } | |
89 | *m_ptr = NULL; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* Read from the ELF header and then the crash dump. On error, negative value is | |
94 | * returned otherwise number of bytes read are returned. | |
95 | */ | |
96 | static ssize_t read_vmcore(struct file *file, char __user *buffer, | |
97 | size_t buflen, loff_t *fpos) | |
98 | { | |
99 | ssize_t acc = 0, tmp; | |
80e8ff63 VG |
100 | size_t tsz; |
101 | u64 start, nr_bytes; | |
666bfddb VG |
102 | struct vmcore *curr_m = NULL; |
103 | ||
104 | if (buflen == 0 || *fpos >= vmcore_size) | |
105 | return 0; | |
106 | ||
107 | /* trim buflen to not go beyond EOF */ | |
108 | if (buflen > vmcore_size - *fpos) | |
109 | buflen = vmcore_size - *fpos; | |
110 | ||
111 | /* Read ELF core header */ | |
112 | if (*fpos < elfcorebuf_sz) { | |
113 | tsz = elfcorebuf_sz - *fpos; | |
114 | if (buflen < tsz) | |
115 | tsz = buflen; | |
116 | if (copy_to_user(buffer, elfcorebuf + *fpos, tsz)) | |
117 | return -EFAULT; | |
118 | buflen -= tsz; | |
119 | *fpos += tsz; | |
120 | buffer += tsz; | |
121 | acc += tsz; | |
122 | ||
123 | /* leave now if filled buffer already */ | |
124 | if (buflen == 0) | |
125 | return acc; | |
126 | } | |
127 | ||
128 | start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m); | |
129 | if (!curr_m) | |
130 | return -EINVAL; | |
131 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) | |
132 | tsz = buflen; | |
133 | ||
134 | /* Calculate left bytes in current memory segment. */ | |
135 | nr_bytes = (curr_m->size - (start - curr_m->paddr)); | |
136 | if (tsz > nr_bytes) | |
137 | tsz = nr_bytes; | |
138 | ||
139 | while (buflen) { | |
140 | tmp = read_from_oldmem(buffer, tsz, &start, 1); | |
141 | if (tmp < 0) | |
142 | return tmp; | |
143 | buflen -= tsz; | |
144 | *fpos += tsz; | |
145 | buffer += tsz; | |
146 | acc += tsz; | |
147 | if (start >= (curr_m->paddr + curr_m->size)) { | |
148 | if (curr_m->list.next == &vmcore_list) | |
149 | return acc; /*EOF*/ | |
150 | curr_m = list_entry(curr_m->list.next, | |
151 | struct vmcore, list); | |
152 | start = curr_m->paddr; | |
153 | } | |
154 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) | |
155 | tsz = buflen; | |
156 | /* Calculate left bytes in current memory segment. */ | |
157 | nr_bytes = (curr_m->size - (start - curr_m->paddr)); | |
158 | if (tsz > nr_bytes) | |
159 | tsz = nr_bytes; | |
160 | } | |
161 | return acc; | |
162 | } | |
163 | ||
5aa140c2 | 164 | static const struct file_operations proc_vmcore_operations = { |
666bfddb | 165 | .read = read_vmcore, |
666bfddb VG |
166 | }; |
167 | ||
168 | static struct vmcore* __init get_new_element(void) | |
169 | { | |
2f6d3110 | 170 | return kzalloc(sizeof(struct vmcore), GFP_KERNEL); |
666bfddb VG |
171 | } |
172 | ||
173 | static u64 __init get_vmcore_size_elf64(char *elfptr) | |
174 | { | |
175 | int i; | |
176 | u64 size; | |
177 | Elf64_Ehdr *ehdr_ptr; | |
178 | Elf64_Phdr *phdr_ptr; | |
179 | ||
180 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
181 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); | |
182 | size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr)); | |
183 | for (i = 0; i < ehdr_ptr->e_phnum; i++) { | |
184 | size += phdr_ptr->p_memsz; | |
185 | phdr_ptr++; | |
186 | } | |
187 | return size; | |
188 | } | |
189 | ||
72658e9d VG |
190 | static u64 __init get_vmcore_size_elf32(char *elfptr) |
191 | { | |
192 | int i; | |
193 | u64 size; | |
194 | Elf32_Ehdr *ehdr_ptr; | |
195 | Elf32_Phdr *phdr_ptr; | |
196 | ||
197 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
198 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); | |
199 | size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr)); | |
200 | for (i = 0; i < ehdr_ptr->e_phnum; i++) { | |
201 | size += phdr_ptr->p_memsz; | |
202 | phdr_ptr++; | |
203 | } | |
204 | return size; | |
205 | } | |
206 | ||
666bfddb VG |
207 | /* Merges all the PT_NOTE headers into one. */ |
208 | static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, | |
209 | struct list_head *vc_list) | |
210 | { | |
211 | int i, nr_ptnote=0, rc=0; | |
212 | char *tmp; | |
213 | Elf64_Ehdr *ehdr_ptr; | |
214 | Elf64_Phdr phdr, *phdr_ptr; | |
215 | Elf64_Nhdr *nhdr_ptr; | |
216 | u64 phdr_sz = 0, note_off; | |
217 | ||
218 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
219 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); | |
220 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
221 | int j; | |
222 | void *notes_section; | |
223 | struct vmcore *new; | |
224 | u64 offset, max_sz, sz, real_sz = 0; | |
225 | if (phdr_ptr->p_type != PT_NOTE) | |
226 | continue; | |
227 | nr_ptnote++; | |
228 | max_sz = phdr_ptr->p_memsz; | |
229 | offset = phdr_ptr->p_offset; | |
230 | notes_section = kmalloc(max_sz, GFP_KERNEL); | |
231 | if (!notes_section) | |
232 | return -ENOMEM; | |
233 | rc = read_from_oldmem(notes_section, max_sz, &offset, 0); | |
234 | if (rc < 0) { | |
235 | kfree(notes_section); | |
236 | return rc; | |
237 | } | |
238 | nhdr_ptr = notes_section; | |
239 | for (j = 0; j < max_sz; j += sz) { | |
240 | if (nhdr_ptr->n_namesz == 0) | |
241 | break; | |
242 | sz = sizeof(Elf64_Nhdr) + | |
243 | ((nhdr_ptr->n_namesz + 3) & ~3) + | |
244 | ((nhdr_ptr->n_descsz + 3) & ~3); | |
245 | real_sz += sz; | |
246 | nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz); | |
247 | } | |
248 | ||
249 | /* Add this contiguous chunk of notes section to vmcore list.*/ | |
250 | new = get_new_element(); | |
251 | if (!new) { | |
252 | kfree(notes_section); | |
253 | return -ENOMEM; | |
254 | } | |
255 | new->paddr = phdr_ptr->p_offset; | |
256 | new->size = real_sz; | |
257 | list_add_tail(&new->list, vc_list); | |
258 | phdr_sz += real_sz; | |
259 | kfree(notes_section); | |
260 | } | |
261 | ||
262 | /* Prepare merged PT_NOTE program header. */ | |
263 | phdr.p_type = PT_NOTE; | |
264 | phdr.p_flags = 0; | |
265 | note_off = sizeof(Elf64_Ehdr) + | |
266 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr); | |
267 | phdr.p_offset = note_off; | |
268 | phdr.p_vaddr = phdr.p_paddr = 0; | |
269 | phdr.p_filesz = phdr.p_memsz = phdr_sz; | |
270 | phdr.p_align = 0; | |
271 | ||
272 | /* Add merged PT_NOTE program header*/ | |
273 | tmp = elfptr + sizeof(Elf64_Ehdr); | |
274 | memcpy(tmp, &phdr, sizeof(phdr)); | |
275 | tmp += sizeof(phdr); | |
276 | ||
277 | /* Remove unwanted PT_NOTE program headers. */ | |
278 | i = (nr_ptnote - 1) * sizeof(Elf64_Phdr); | |
279 | *elfsz = *elfsz - i; | |
280 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr))); | |
281 | ||
282 | /* Modify e_phnum to reflect merged headers. */ | |
283 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
72658e9d VG |
288 | /* Merges all the PT_NOTE headers into one. */ |
289 | static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz, | |
290 | struct list_head *vc_list) | |
291 | { | |
292 | int i, nr_ptnote=0, rc=0; | |
293 | char *tmp; | |
294 | Elf32_Ehdr *ehdr_ptr; | |
295 | Elf32_Phdr phdr, *phdr_ptr; | |
296 | Elf32_Nhdr *nhdr_ptr; | |
297 | u64 phdr_sz = 0, note_off; | |
298 | ||
299 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
300 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); | |
301 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
302 | int j; | |
303 | void *notes_section; | |
304 | struct vmcore *new; | |
305 | u64 offset, max_sz, sz, real_sz = 0; | |
306 | if (phdr_ptr->p_type != PT_NOTE) | |
307 | continue; | |
308 | nr_ptnote++; | |
309 | max_sz = phdr_ptr->p_memsz; | |
310 | offset = phdr_ptr->p_offset; | |
311 | notes_section = kmalloc(max_sz, GFP_KERNEL); | |
312 | if (!notes_section) | |
313 | return -ENOMEM; | |
314 | rc = read_from_oldmem(notes_section, max_sz, &offset, 0); | |
315 | if (rc < 0) { | |
316 | kfree(notes_section); | |
317 | return rc; | |
318 | } | |
319 | nhdr_ptr = notes_section; | |
320 | for (j = 0; j < max_sz; j += sz) { | |
321 | if (nhdr_ptr->n_namesz == 0) | |
322 | break; | |
323 | sz = sizeof(Elf32_Nhdr) + | |
324 | ((nhdr_ptr->n_namesz + 3) & ~3) + | |
325 | ((nhdr_ptr->n_descsz + 3) & ~3); | |
326 | real_sz += sz; | |
327 | nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz); | |
328 | } | |
329 | ||
330 | /* Add this contiguous chunk of notes section to vmcore list.*/ | |
331 | new = get_new_element(); | |
332 | if (!new) { | |
333 | kfree(notes_section); | |
334 | return -ENOMEM; | |
335 | } | |
336 | new->paddr = phdr_ptr->p_offset; | |
337 | new->size = real_sz; | |
338 | list_add_tail(&new->list, vc_list); | |
339 | phdr_sz += real_sz; | |
340 | kfree(notes_section); | |
341 | } | |
342 | ||
343 | /* Prepare merged PT_NOTE program header. */ | |
344 | phdr.p_type = PT_NOTE; | |
345 | phdr.p_flags = 0; | |
346 | note_off = sizeof(Elf32_Ehdr) + | |
347 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr); | |
348 | phdr.p_offset = note_off; | |
349 | phdr.p_vaddr = phdr.p_paddr = 0; | |
350 | phdr.p_filesz = phdr.p_memsz = phdr_sz; | |
351 | phdr.p_align = 0; | |
352 | ||
353 | /* Add merged PT_NOTE program header*/ | |
354 | tmp = elfptr + sizeof(Elf32_Ehdr); | |
355 | memcpy(tmp, &phdr, sizeof(phdr)); | |
356 | tmp += sizeof(phdr); | |
357 | ||
358 | /* Remove unwanted PT_NOTE program headers. */ | |
359 | i = (nr_ptnote - 1) * sizeof(Elf32_Phdr); | |
360 | *elfsz = *elfsz - i; | |
361 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr))); | |
362 | ||
363 | /* Modify e_phnum to reflect merged headers. */ | |
364 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
666bfddb VG |
369 | /* Add memory chunks represented by program headers to vmcore list. Also update |
370 | * the new offset fields of exported program headers. */ | |
371 | static int __init process_ptload_program_headers_elf64(char *elfptr, | |
372 | size_t elfsz, | |
373 | struct list_head *vc_list) | |
374 | { | |
375 | int i; | |
376 | Elf64_Ehdr *ehdr_ptr; | |
377 | Elf64_Phdr *phdr_ptr; | |
378 | loff_t vmcore_off; | |
379 | struct vmcore *new; | |
380 | ||
381 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
382 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */ | |
383 | ||
384 | /* First program header is PT_NOTE header. */ | |
385 | vmcore_off = sizeof(Elf64_Ehdr) + | |
386 | (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) + | |
387 | phdr_ptr->p_memsz; /* Note sections */ | |
388 | ||
389 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
390 | if (phdr_ptr->p_type != PT_LOAD) | |
391 | continue; | |
392 | ||
393 | /* Add this contiguous chunk of memory to vmcore list.*/ | |
394 | new = get_new_element(); | |
395 | if (!new) | |
396 | return -ENOMEM; | |
397 | new->paddr = phdr_ptr->p_offset; | |
398 | new->size = phdr_ptr->p_memsz; | |
399 | list_add_tail(&new->list, vc_list); | |
400 | ||
401 | /* Update the program header offset. */ | |
402 | phdr_ptr->p_offset = vmcore_off; | |
403 | vmcore_off = vmcore_off + phdr_ptr->p_memsz; | |
404 | } | |
405 | return 0; | |
406 | } | |
407 | ||
72658e9d VG |
408 | static int __init process_ptload_program_headers_elf32(char *elfptr, |
409 | size_t elfsz, | |
410 | struct list_head *vc_list) | |
411 | { | |
412 | int i; | |
413 | Elf32_Ehdr *ehdr_ptr; | |
414 | Elf32_Phdr *phdr_ptr; | |
415 | loff_t vmcore_off; | |
416 | struct vmcore *new; | |
417 | ||
418 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
419 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */ | |
420 | ||
421 | /* First program header is PT_NOTE header. */ | |
422 | vmcore_off = sizeof(Elf32_Ehdr) + | |
423 | (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) + | |
424 | phdr_ptr->p_memsz; /* Note sections */ | |
425 | ||
426 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
427 | if (phdr_ptr->p_type != PT_LOAD) | |
428 | continue; | |
429 | ||
430 | /* Add this contiguous chunk of memory to vmcore list.*/ | |
431 | new = get_new_element(); | |
432 | if (!new) | |
433 | return -ENOMEM; | |
434 | new->paddr = phdr_ptr->p_offset; | |
435 | new->size = phdr_ptr->p_memsz; | |
436 | list_add_tail(&new->list, vc_list); | |
437 | ||
438 | /* Update the program header offset */ | |
439 | phdr_ptr->p_offset = vmcore_off; | |
440 | vmcore_off = vmcore_off + phdr_ptr->p_memsz; | |
441 | } | |
442 | return 0; | |
443 | } | |
444 | ||
666bfddb VG |
445 | /* Sets offset fields of vmcore elements. */ |
446 | static void __init set_vmcore_list_offsets_elf64(char *elfptr, | |
447 | struct list_head *vc_list) | |
448 | { | |
449 | loff_t vmcore_off; | |
450 | Elf64_Ehdr *ehdr_ptr; | |
451 | struct vmcore *m; | |
452 | ||
453 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
454 | ||
455 | /* Skip Elf header and program headers. */ | |
456 | vmcore_off = sizeof(Elf64_Ehdr) + | |
457 | (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr); | |
458 | ||
459 | list_for_each_entry(m, vc_list, list) { | |
460 | m->offset = vmcore_off; | |
461 | vmcore_off += m->size; | |
462 | } | |
463 | } | |
464 | ||
72658e9d VG |
465 | /* Sets offset fields of vmcore elements. */ |
466 | static void __init set_vmcore_list_offsets_elf32(char *elfptr, | |
467 | struct list_head *vc_list) | |
468 | { | |
469 | loff_t vmcore_off; | |
470 | Elf32_Ehdr *ehdr_ptr; | |
471 | struct vmcore *m; | |
472 | ||
473 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
474 | ||
475 | /* Skip Elf header and program headers. */ | |
476 | vmcore_off = sizeof(Elf32_Ehdr) + | |
477 | (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr); | |
478 | ||
479 | list_for_each_entry(m, vc_list, list) { | |
480 | m->offset = vmcore_off; | |
481 | vmcore_off += m->size; | |
482 | } | |
483 | } | |
484 | ||
666bfddb VG |
485 | static int __init parse_crash_elf64_headers(void) |
486 | { | |
487 | int rc=0; | |
488 | Elf64_Ehdr ehdr; | |
489 | u64 addr; | |
490 | ||
491 | addr = elfcorehdr_addr; | |
492 | ||
493 | /* Read Elf header */ | |
494 | rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0); | |
495 | if (rc < 0) | |
496 | return rc; | |
497 | ||
498 | /* Do some basic Verification. */ | |
499 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || | |
500 | (ehdr.e_type != ET_CORE) || | |
79e03011 | 501 | !vmcore_elf_check_arch(&ehdr) || |
666bfddb VG |
502 | ehdr.e_ident[EI_CLASS] != ELFCLASS64 || |
503 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || | |
504 | ehdr.e_version != EV_CURRENT || | |
505 | ehdr.e_ehsize != sizeof(Elf64_Ehdr) || | |
506 | ehdr.e_phentsize != sizeof(Elf64_Phdr) || | |
507 | ehdr.e_phnum == 0) { | |
508 | printk(KERN_WARNING "Warning: Core image elf header is not" | |
509 | "sane\n"); | |
510 | return -EINVAL; | |
511 | } | |
512 | ||
513 | /* Read in all elf headers. */ | |
514 | elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr); | |
515 | elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL); | |
516 | if (!elfcorebuf) | |
517 | return -ENOMEM; | |
518 | addr = elfcorehdr_addr; | |
519 | rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0); | |
520 | if (rc < 0) { | |
521 | kfree(elfcorebuf); | |
522 | return rc; | |
523 | } | |
524 | ||
525 | /* Merge all PT_NOTE headers into one. */ | |
526 | rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list); | |
527 | if (rc) { | |
528 | kfree(elfcorebuf); | |
529 | return rc; | |
530 | } | |
531 | rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz, | |
532 | &vmcore_list); | |
533 | if (rc) { | |
534 | kfree(elfcorebuf); | |
535 | return rc; | |
536 | } | |
537 | set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list); | |
538 | return 0; | |
539 | } | |
540 | ||
72658e9d VG |
541 | static int __init parse_crash_elf32_headers(void) |
542 | { | |
543 | int rc=0; | |
544 | Elf32_Ehdr ehdr; | |
545 | u64 addr; | |
546 | ||
547 | addr = elfcorehdr_addr; | |
548 | ||
549 | /* Read Elf header */ | |
550 | rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0); | |
551 | if (rc < 0) | |
552 | return rc; | |
553 | ||
554 | /* Do some basic Verification. */ | |
555 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || | |
556 | (ehdr.e_type != ET_CORE) || | |
557 | !elf_check_arch(&ehdr) || | |
558 | ehdr.e_ident[EI_CLASS] != ELFCLASS32|| | |
559 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || | |
560 | ehdr.e_version != EV_CURRENT || | |
561 | ehdr.e_ehsize != sizeof(Elf32_Ehdr) || | |
562 | ehdr.e_phentsize != sizeof(Elf32_Phdr) || | |
563 | ehdr.e_phnum == 0) { | |
564 | printk(KERN_WARNING "Warning: Core image elf header is not" | |
565 | "sane\n"); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | /* Read in all elf headers. */ | |
570 | elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr); | |
571 | elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL); | |
572 | if (!elfcorebuf) | |
573 | return -ENOMEM; | |
574 | addr = elfcorehdr_addr; | |
575 | rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0); | |
576 | if (rc < 0) { | |
577 | kfree(elfcorebuf); | |
578 | return rc; | |
579 | } | |
580 | ||
581 | /* Merge all PT_NOTE headers into one. */ | |
582 | rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list); | |
583 | if (rc) { | |
584 | kfree(elfcorebuf); | |
585 | return rc; | |
586 | } | |
587 | rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz, | |
588 | &vmcore_list); | |
589 | if (rc) { | |
590 | kfree(elfcorebuf); | |
591 | return rc; | |
592 | } | |
593 | set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list); | |
594 | return 0; | |
595 | } | |
596 | ||
666bfddb VG |
597 | static int __init parse_crash_elf_headers(void) |
598 | { | |
599 | unsigned char e_ident[EI_NIDENT]; | |
600 | u64 addr; | |
601 | int rc=0; | |
602 | ||
603 | addr = elfcorehdr_addr; | |
604 | rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0); | |
605 | if (rc < 0) | |
606 | return rc; | |
607 | if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) { | |
608 | printk(KERN_WARNING "Warning: Core image elf header" | |
609 | " not found\n"); | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
613 | if (e_ident[EI_CLASS] == ELFCLASS64) { | |
614 | rc = parse_crash_elf64_headers(); | |
615 | if (rc) | |
616 | return rc; | |
617 | ||
618 | /* Determine vmcore size. */ | |
619 | vmcore_size = get_vmcore_size_elf64(elfcorebuf); | |
72658e9d VG |
620 | } else if (e_ident[EI_CLASS] == ELFCLASS32) { |
621 | rc = parse_crash_elf32_headers(); | |
622 | if (rc) | |
623 | return rc; | |
624 | ||
625 | /* Determine vmcore size. */ | |
626 | vmcore_size = get_vmcore_size_elf32(elfcorebuf); | |
666bfddb VG |
627 | } else { |
628 | printk(KERN_WARNING "Warning: Core image elf header is not" | |
629 | " sane\n"); | |
630 | return -EINVAL; | |
631 | } | |
632 | return 0; | |
633 | } | |
634 | ||
635 | /* Init function for vmcore module. */ | |
636 | static int __init vmcore_init(void) | |
637 | { | |
638 | int rc = 0; | |
639 | ||
640 | /* If elfcorehdr= has been passed in cmdline, then capture the dump.*/ | |
85a0ee34 | 641 | if (!(is_vmcore_usable())) |
666bfddb VG |
642 | return rc; |
643 | rc = parse_crash_elf_headers(); | |
644 | if (rc) { | |
645 | printk(KERN_WARNING "Kdump: vmcore not initialized\n"); | |
646 | return rc; | |
647 | } | |
648 | ||
5aa140c2 | 649 | proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations); |
666bfddb VG |
650 | if (proc_vmcore) |
651 | proc_vmcore->size = vmcore_size; | |
652 | return 0; | |
653 | } | |
654 | module_init(vmcore_init) |