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 | 10 | #include <linux/mm.h> |
2f96b8c1 | 11 | #include <linux/kcore.h> |
666bfddb | 12 | #include <linux/user.h> |
666bfddb VG |
13 | #include <linux/elf.h> |
14 | #include <linux/elfcore.h> | |
afeacc8c | 15 | #include <linux/export.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
666bfddb | 17 | #include <linux/highmem.h> |
87ebdc00 | 18 | #include <linux/printk.h> |
666bfddb VG |
19 | #include <linux/bootmem.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/crash_dump.h> | |
22 | #include <linux/list.h> | |
83086978 | 23 | #include <linux/vmalloc.h> |
9cb21813 | 24 | #include <linux/pagemap.h> |
666bfddb VG |
25 | #include <asm/uaccess.h> |
26 | #include <asm/io.h> | |
2f96b8c1 | 27 | #include "internal.h" |
666bfddb VG |
28 | |
29 | /* List representing chunks of contiguous memory areas and their offsets in | |
30 | * vmcore file. | |
31 | */ | |
32 | static LIST_HEAD(vmcore_list); | |
33 | ||
34 | /* Stores the pointer to the buffer containing kernel elf core headers. */ | |
35 | static char *elfcorebuf; | |
36 | static size_t elfcorebuf_sz; | |
f2bdacdd | 37 | static size_t elfcorebuf_sz_orig; |
666bfddb | 38 | |
087350c9 HD |
39 | static char *elfnotes_buf; |
40 | static size_t elfnotes_sz; | |
41 | ||
666bfddb VG |
42 | /* Total size of vmcore file. */ |
43 | static u64 vmcore_size; | |
44 | ||
5aa140c2 | 45 | static struct proc_dir_entry *proc_vmcore = NULL; |
666bfddb | 46 | |
997c136f OH |
47 | /* |
48 | * Returns > 0 for RAM pages, 0 for non-RAM pages, < 0 on error | |
49 | * The called function has to take care of module refcounting. | |
50 | */ | |
51 | static int (*oldmem_pfn_is_ram)(unsigned long pfn); | |
52 | ||
53 | int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn)) | |
54 | { | |
55 | if (oldmem_pfn_is_ram) | |
56 | return -EBUSY; | |
57 | oldmem_pfn_is_ram = fn; | |
58 | return 0; | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(register_oldmem_pfn_is_ram); | |
61 | ||
62 | void unregister_oldmem_pfn_is_ram(void) | |
63 | { | |
64 | oldmem_pfn_is_ram = NULL; | |
65 | wmb(); | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(unregister_oldmem_pfn_is_ram); | |
68 | ||
69 | static int pfn_is_ram(unsigned long pfn) | |
70 | { | |
71 | int (*fn)(unsigned long pfn); | |
72 | /* pfn is ram unless fn() checks pagetype */ | |
73 | int ret = 1; | |
74 | ||
75 | /* | |
76 | * Ask hypervisor if the pfn is really ram. | |
77 | * A ballooned page contains no data and reading from such a page | |
78 | * will cause high load in the hypervisor. | |
79 | */ | |
80 | fn = oldmem_pfn_is_ram; | |
81 | if (fn) | |
82 | ret = fn(pfn); | |
83 | ||
84 | return ret; | |
85 | } | |
86 | ||
666bfddb VG |
87 | /* Reads a page from the oldmem device from given offset. */ |
88 | static ssize_t read_from_oldmem(char *buf, size_t count, | |
9e9e3941 | 89 | u64 *ppos, int userbuf) |
666bfddb VG |
90 | { |
91 | unsigned long pfn, offset; | |
92 | size_t nr_bytes; | |
93 | ssize_t read = 0, tmp; | |
94 | ||
95 | if (!count) | |
96 | return 0; | |
97 | ||
98 | offset = (unsigned long)(*ppos % PAGE_SIZE); | |
99 | pfn = (unsigned long)(*ppos / PAGE_SIZE); | |
666bfddb VG |
100 | |
101 | do { | |
102 | if (count > (PAGE_SIZE - offset)) | |
103 | nr_bytes = PAGE_SIZE - offset; | |
104 | else | |
105 | nr_bytes = count; | |
106 | ||
997c136f OH |
107 | /* If pfn is not ram, return zeros for sparse dump files */ |
108 | if (pfn_is_ram(pfn) == 0) | |
109 | memset(buf, 0, nr_bytes); | |
110 | else { | |
111 | tmp = copy_oldmem_page(pfn, buf, nr_bytes, | |
112 | offset, userbuf); | |
113 | if (tmp < 0) | |
114 | return tmp; | |
115 | } | |
666bfddb VG |
116 | *ppos += nr_bytes; |
117 | count -= nr_bytes; | |
118 | buf += nr_bytes; | |
119 | read += nr_bytes; | |
120 | ++pfn; | |
121 | offset = 0; | |
122 | } while (count); | |
123 | ||
124 | return read; | |
125 | } | |
126 | ||
be8a8d06 MH |
127 | /* |
128 | * Architectures may override this function to allocate ELF header in 2nd kernel | |
129 | */ | |
130 | int __weak elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size) | |
131 | { | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
136 | * Architectures may override this function to free header | |
137 | */ | |
138 | void __weak elfcorehdr_free(unsigned long long addr) | |
139 | {} | |
140 | ||
141 | /* | |
142 | * Architectures may override this function to read from ELF header | |
143 | */ | |
144 | ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos) | |
145 | { | |
146 | return read_from_oldmem(buf, count, ppos, 0); | |
147 | } | |
148 | ||
149 | /* | |
150 | * Architectures may override this function to read from notes sections | |
151 | */ | |
152 | ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos) | |
153 | { | |
154 | return read_from_oldmem(buf, count, ppos, 0); | |
155 | } | |
156 | ||
9cb21813 MH |
157 | /* |
158 | * Architectures may override this function to map oldmem | |
159 | */ | |
160 | int __weak remap_oldmem_pfn_range(struct vm_area_struct *vma, | |
161 | unsigned long from, unsigned long pfn, | |
162 | unsigned long size, pgprot_t prot) | |
163 | { | |
164 | return remap_pfn_range(vma, from, pfn, size, prot); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Copy to either kernel or user space | |
169 | */ | |
170 | static int copy_to(void *target, void *src, size_t size, int userbuf) | |
171 | { | |
172 | if (userbuf) { | |
173 | if (copy_to_user((char __user *) target, src, size)) | |
174 | return -EFAULT; | |
175 | } else { | |
176 | memcpy(target, src, size); | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
666bfddb VG |
181 | /* Read from the ELF header and then the crash dump. On error, negative value is |
182 | * returned otherwise number of bytes read are returned. | |
183 | */ | |
9cb21813 MH |
184 | static ssize_t __read_vmcore(char *buffer, size_t buflen, loff_t *fpos, |
185 | int userbuf) | |
666bfddb VG |
186 | { |
187 | ssize_t acc = 0, tmp; | |
80e8ff63 | 188 | size_t tsz; |
b27eb186 HD |
189 | u64 start; |
190 | struct vmcore *m = NULL; | |
666bfddb VG |
191 | |
192 | if (buflen == 0 || *fpos >= vmcore_size) | |
193 | return 0; | |
194 | ||
195 | /* trim buflen to not go beyond EOF */ | |
196 | if (buflen > vmcore_size - *fpos) | |
197 | buflen = vmcore_size - *fpos; | |
198 | ||
199 | /* Read ELF core header */ | |
200 | if (*fpos < elfcorebuf_sz) { | |
087350c9 | 201 | tsz = min(elfcorebuf_sz - (size_t)*fpos, buflen); |
9cb21813 | 202 | if (copy_to(buffer, elfcorebuf + *fpos, tsz, userbuf)) |
666bfddb VG |
203 | return -EFAULT; |
204 | buflen -= tsz; | |
205 | *fpos += tsz; | |
206 | buffer += tsz; | |
207 | acc += tsz; | |
208 | ||
209 | /* leave now if filled buffer already */ | |
210 | if (buflen == 0) | |
211 | return acc; | |
212 | } | |
213 | ||
087350c9 HD |
214 | /* Read Elf note segment */ |
215 | if (*fpos < elfcorebuf_sz + elfnotes_sz) { | |
216 | void *kaddr; | |
217 | ||
218 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)*fpos, buflen); | |
219 | kaddr = elfnotes_buf + *fpos - elfcorebuf_sz; | |
9cb21813 | 220 | if (copy_to(buffer, kaddr, tsz, userbuf)) |
087350c9 HD |
221 | return -EFAULT; |
222 | buflen -= tsz; | |
223 | *fpos += tsz; | |
224 | buffer += tsz; | |
225 | acc += tsz; | |
226 | ||
227 | /* leave now if filled buffer already */ | |
228 | if (buflen == 0) | |
229 | return acc; | |
230 | } | |
231 | ||
b27eb186 HD |
232 | list_for_each_entry(m, &vmcore_list, list) { |
233 | if (*fpos < m->offset + m->size) { | |
087350c9 | 234 | tsz = min_t(size_t, m->offset + m->size - *fpos, buflen); |
b27eb186 | 235 | start = m->paddr + *fpos - m->offset; |
9cb21813 | 236 | tmp = read_from_oldmem(buffer, tsz, &start, userbuf); |
b27eb186 HD |
237 | if (tmp < 0) |
238 | return tmp; | |
239 | buflen -= tsz; | |
240 | *fpos += tsz; | |
241 | buffer += tsz; | |
242 | acc += tsz; | |
243 | ||
244 | /* leave now if filled buffer already */ | |
245 | if (buflen == 0) | |
246 | return acc; | |
666bfddb | 247 | } |
666bfddb | 248 | } |
b27eb186 | 249 | |
666bfddb VG |
250 | return acc; |
251 | } | |
252 | ||
9cb21813 MH |
253 | static ssize_t read_vmcore(struct file *file, char __user *buffer, |
254 | size_t buflen, loff_t *fpos) | |
255 | { | |
256 | return __read_vmcore((__force char *) buffer, buflen, fpos, 1); | |
257 | } | |
258 | ||
259 | /* | |
260 | * The vmcore fault handler uses the page cache and fills data using the | |
261 | * standard __vmcore_read() function. | |
262 | * | |
263 | * On s390 the fault handler is used for memory regions that can't be mapped | |
264 | * directly with remap_pfn_range(). | |
265 | */ | |
266 | static int mmap_vmcore_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
267 | { | |
268 | #ifdef CONFIG_S390 | |
269 | struct address_space *mapping = vma->vm_file->f_mapping; | |
270 | pgoff_t index = vmf->pgoff; | |
271 | struct page *page; | |
272 | loff_t offset; | |
273 | char *buf; | |
274 | int rc; | |
275 | ||
276 | page = find_or_create_page(mapping, index, GFP_KERNEL); | |
277 | if (!page) | |
278 | return VM_FAULT_OOM; | |
279 | if (!PageUptodate(page)) { | |
280 | offset = (loff_t) index << PAGE_CACHE_SHIFT; | |
281 | buf = __va((page_to_pfn(page) << PAGE_SHIFT)); | |
282 | rc = __read_vmcore(buf, PAGE_SIZE, &offset, 0); | |
283 | if (rc < 0) { | |
284 | unlock_page(page); | |
285 | page_cache_release(page); | |
286 | return (rc == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
287 | } | |
288 | SetPageUptodate(page); | |
289 | } | |
290 | unlock_page(page); | |
291 | vmf->page = page; | |
292 | return 0; | |
293 | #else | |
294 | return VM_FAULT_SIGBUS; | |
295 | #endif | |
296 | } | |
297 | ||
298 | static const struct vm_operations_struct vmcore_mmap_ops = { | |
299 | .fault = mmap_vmcore_fault, | |
300 | }; | |
301 | ||
83086978 HD |
302 | /** |
303 | * alloc_elfnotes_buf - allocate buffer for ELF note segment in | |
304 | * vmalloc memory | |
305 | * | |
306 | * @notes_sz: size of buffer | |
307 | * | |
308 | * If CONFIG_MMU is defined, use vmalloc_user() to allow users to mmap | |
309 | * the buffer to user-space by means of remap_vmalloc_range(). | |
310 | * | |
311 | * If CONFIG_MMU is not defined, use vzalloc() since mmap_vmcore() is | |
312 | * disabled and there's no need to allow users to mmap the buffer. | |
313 | */ | |
314 | static inline char *alloc_elfnotes_buf(size_t notes_sz) | |
315 | { | |
316 | #ifdef CONFIG_MMU | |
317 | return vmalloc_user(notes_sz); | |
318 | #else | |
319 | return vzalloc(notes_sz); | |
320 | #endif | |
321 | } | |
322 | ||
323 | /* | |
324 | * Disable mmap_vmcore() if CONFIG_MMU is not defined. MMU is | |
325 | * essential for mmap_vmcore() in order to map physically | |
326 | * non-contiguous objects (ELF header, ELF note segment and memory | |
327 | * regions in the 1st kernel pointed to by PT_LOAD entries) into | |
328 | * virtually contiguous user-space in ELF layout. | |
329 | */ | |
11e376a3 | 330 | #ifdef CONFIG_MMU |
83086978 HD |
331 | static int mmap_vmcore(struct file *file, struct vm_area_struct *vma) |
332 | { | |
333 | size_t size = vma->vm_end - vma->vm_start; | |
334 | u64 start, end, len, tsz; | |
335 | struct vmcore *m; | |
336 | ||
337 | start = (u64)vma->vm_pgoff << PAGE_SHIFT; | |
338 | end = start + size; | |
339 | ||
340 | if (size > vmcore_size || end > vmcore_size) | |
341 | return -EINVAL; | |
342 | ||
343 | if (vma->vm_flags & (VM_WRITE | VM_EXEC)) | |
344 | return -EPERM; | |
345 | ||
346 | vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC); | |
347 | vma->vm_flags |= VM_MIXEDMAP; | |
9cb21813 | 348 | vma->vm_ops = &vmcore_mmap_ops; |
83086978 HD |
349 | |
350 | len = 0; | |
351 | ||
352 | if (start < elfcorebuf_sz) { | |
353 | u64 pfn; | |
354 | ||
355 | tsz = min(elfcorebuf_sz - (size_t)start, size); | |
356 | pfn = __pa(elfcorebuf + start) >> PAGE_SHIFT; | |
357 | if (remap_pfn_range(vma, vma->vm_start, pfn, tsz, | |
358 | vma->vm_page_prot)) | |
359 | return -EAGAIN; | |
360 | size -= tsz; | |
361 | start += tsz; | |
362 | len += tsz; | |
363 | ||
364 | if (size == 0) | |
365 | return 0; | |
366 | } | |
367 | ||
368 | if (start < elfcorebuf_sz + elfnotes_sz) { | |
369 | void *kaddr; | |
370 | ||
371 | tsz = min(elfcorebuf_sz + elfnotes_sz - (size_t)start, size); | |
372 | kaddr = elfnotes_buf + start - elfcorebuf_sz; | |
373 | if (remap_vmalloc_range_partial(vma, vma->vm_start + len, | |
374 | kaddr, tsz)) | |
375 | goto fail; | |
376 | size -= tsz; | |
377 | start += tsz; | |
378 | len += tsz; | |
379 | ||
380 | if (size == 0) | |
381 | return 0; | |
382 | } | |
383 | ||
384 | list_for_each_entry(m, &vmcore_list, list) { | |
385 | if (start < m->offset + m->size) { | |
386 | u64 paddr = 0; | |
387 | ||
388 | tsz = min_t(size_t, m->offset + m->size - start, size); | |
389 | paddr = m->paddr + start - m->offset; | |
9cb21813 MH |
390 | if (remap_oldmem_pfn_range(vma, vma->vm_start + len, |
391 | paddr >> PAGE_SHIFT, tsz, | |
392 | vma->vm_page_prot)) | |
83086978 HD |
393 | goto fail; |
394 | size -= tsz; | |
395 | start += tsz; | |
396 | len += tsz; | |
397 | ||
398 | if (size == 0) | |
399 | return 0; | |
400 | } | |
401 | } | |
402 | ||
403 | return 0; | |
404 | fail: | |
405 | do_munmap(vma->vm_mm, vma->vm_start, len); | |
406 | return -EAGAIN; | |
407 | } | |
408 | #else | |
409 | static int mmap_vmcore(struct file *file, struct vm_area_struct *vma) | |
410 | { | |
411 | return -ENOSYS; | |
412 | } | |
413 | #endif | |
414 | ||
5aa140c2 | 415 | static const struct file_operations proc_vmcore_operations = { |
666bfddb | 416 | .read = read_vmcore, |
c227e690 | 417 | .llseek = default_llseek, |
83086978 | 418 | .mmap = mmap_vmcore, |
666bfddb VG |
419 | }; |
420 | ||
421 | static struct vmcore* __init get_new_element(void) | |
422 | { | |
2f6d3110 | 423 | return kzalloc(sizeof(struct vmcore), GFP_KERNEL); |
666bfddb VG |
424 | } |
425 | ||
591ff716 HD |
426 | static u64 __init get_vmcore_size(size_t elfsz, size_t elfnotesegsz, |
427 | struct list_head *vc_list) | |
666bfddb | 428 | { |
666bfddb | 429 | u64 size; |
591ff716 | 430 | struct vmcore *m; |
72658e9d | 431 | |
591ff716 HD |
432 | size = elfsz + elfnotesegsz; |
433 | list_for_each_entry(m, vc_list, list) { | |
434 | size += m->size; | |
72658e9d VG |
435 | } |
436 | return size; | |
437 | } | |
438 | ||
087350c9 HD |
439 | /** |
440 | * update_note_header_size_elf64 - update p_memsz member of each PT_NOTE entry | |
441 | * | |
442 | * @ehdr_ptr: ELF header | |
443 | * | |
444 | * This function updates p_memsz member of each PT_NOTE entry in the | |
445 | * program header table pointed to by @ehdr_ptr to real size of ELF | |
446 | * note segment. | |
447 | */ | |
448 | static int __init update_note_header_size_elf64(const Elf64_Ehdr *ehdr_ptr) | |
666bfddb | 449 | { |
087350c9 HD |
450 | int i, rc=0; |
451 | Elf64_Phdr *phdr_ptr; | |
666bfddb | 452 | Elf64_Nhdr *nhdr_ptr; |
666bfddb | 453 | |
087350c9 | 454 | phdr_ptr = (Elf64_Phdr *)(ehdr_ptr + 1); |
666bfddb | 455 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { |
666bfddb | 456 | void *notes_section; |
666bfddb VG |
457 | u64 offset, max_sz, sz, real_sz = 0; |
458 | if (phdr_ptr->p_type != PT_NOTE) | |
459 | continue; | |
666bfddb VG |
460 | max_sz = phdr_ptr->p_memsz; |
461 | offset = phdr_ptr->p_offset; | |
462 | notes_section = kmalloc(max_sz, GFP_KERNEL); | |
463 | if (!notes_section) | |
464 | return -ENOMEM; | |
be8a8d06 | 465 | rc = elfcorehdr_read_notes(notes_section, max_sz, &offset); |
666bfddb VG |
466 | if (rc < 0) { |
467 | kfree(notes_section); | |
468 | return rc; | |
469 | } | |
470 | nhdr_ptr = notes_section; | |
38dfac84 | 471 | while (nhdr_ptr->n_namesz != 0) { |
666bfddb VG |
472 | sz = sizeof(Elf64_Nhdr) + |
473 | ((nhdr_ptr->n_namesz + 3) & ~3) + | |
474 | ((nhdr_ptr->n_descsz + 3) & ~3); | |
38dfac84 GP |
475 | if ((real_sz + sz) > max_sz) { |
476 | pr_warn("Warning: Exceeded p_memsz, dropping PT_NOTE entry n_namesz=0x%x, n_descsz=0x%x\n", | |
477 | nhdr_ptr->n_namesz, nhdr_ptr->n_descsz); | |
478 | break; | |
479 | } | |
666bfddb VG |
480 | real_sz += sz; |
481 | nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz); | |
482 | } | |
666bfddb | 483 | kfree(notes_section); |
087350c9 | 484 | phdr_ptr->p_memsz = real_sz; |
38dfac84 GP |
485 | if (real_sz == 0) { |
486 | pr_warn("Warning: Zero PT_NOTE entries found\n"); | |
487 | return -EINVAL; | |
488 | } | |
666bfddb VG |
489 | } |
490 | ||
087350c9 HD |
491 | return 0; |
492 | } | |
493 | ||
494 | /** | |
495 | * get_note_number_and_size_elf64 - get the number of PT_NOTE program | |
496 | * headers and sum of real size of their ELF note segment headers and | |
497 | * data. | |
498 | * | |
499 | * @ehdr_ptr: ELF header | |
500 | * @nr_ptnote: buffer for the number of PT_NOTE program headers | |
501 | * @sz_ptnote: buffer for size of unique PT_NOTE program header | |
502 | * | |
503 | * This function is used to merge multiple PT_NOTE program headers | |
504 | * into a unique single one. The resulting unique entry will have | |
505 | * @sz_ptnote in its phdr->p_mem. | |
506 | * | |
507 | * It is assumed that program headers with PT_NOTE type pointed to by | |
508 | * @ehdr_ptr has already been updated by update_note_header_size_elf64 | |
509 | * and each of PT_NOTE program headers has actual ELF note segment | |
510 | * size in its p_memsz member. | |
511 | */ | |
512 | static int __init get_note_number_and_size_elf64(const Elf64_Ehdr *ehdr_ptr, | |
513 | int *nr_ptnote, u64 *sz_ptnote) | |
514 | { | |
515 | int i; | |
516 | Elf64_Phdr *phdr_ptr; | |
517 | ||
518 | *nr_ptnote = *sz_ptnote = 0; | |
519 | ||
520 | phdr_ptr = (Elf64_Phdr *)(ehdr_ptr + 1); | |
521 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
522 | if (phdr_ptr->p_type != PT_NOTE) | |
523 | continue; | |
524 | *nr_ptnote += 1; | |
525 | *sz_ptnote += phdr_ptr->p_memsz; | |
526 | } | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /** | |
532 | * copy_notes_elf64 - copy ELF note segments in a given buffer | |
533 | * | |
534 | * @ehdr_ptr: ELF header | |
535 | * @notes_buf: buffer into which ELF note segments are copied | |
536 | * | |
537 | * This function is used to copy ELF note segment in the 1st kernel | |
538 | * into the buffer @notes_buf in the 2nd kernel. It is assumed that | |
539 | * size of the buffer @notes_buf is equal to or larger than sum of the | |
540 | * real ELF note segment headers and data. | |
541 | * | |
542 | * It is assumed that program headers with PT_NOTE type pointed to by | |
543 | * @ehdr_ptr has already been updated by update_note_header_size_elf64 | |
544 | * and each of PT_NOTE program headers has actual ELF note segment | |
545 | * size in its p_memsz member. | |
546 | */ | |
547 | static int __init copy_notes_elf64(const Elf64_Ehdr *ehdr_ptr, char *notes_buf) | |
548 | { | |
549 | int i, rc=0; | |
550 | Elf64_Phdr *phdr_ptr; | |
551 | ||
552 | phdr_ptr = (Elf64_Phdr*)(ehdr_ptr + 1); | |
553 | ||
554 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
555 | u64 offset; | |
556 | if (phdr_ptr->p_type != PT_NOTE) | |
557 | continue; | |
558 | offset = phdr_ptr->p_offset; | |
be8a8d06 MH |
559 | rc = elfcorehdr_read_notes(notes_buf, phdr_ptr->p_memsz, |
560 | &offset); | |
087350c9 HD |
561 | if (rc < 0) |
562 | return rc; | |
563 | notes_buf += phdr_ptr->p_memsz; | |
564 | } | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | /* Merges all the PT_NOTE headers into one. */ | |
570 | static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz, | |
571 | char **notes_buf, size_t *notes_sz) | |
572 | { | |
573 | int i, nr_ptnote=0, rc=0; | |
574 | char *tmp; | |
575 | Elf64_Ehdr *ehdr_ptr; | |
576 | Elf64_Phdr phdr; | |
577 | u64 phdr_sz = 0, note_off; | |
578 | ||
579 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
580 | ||
581 | rc = update_note_header_size_elf64(ehdr_ptr); | |
582 | if (rc < 0) | |
583 | return rc; | |
584 | ||
585 | rc = get_note_number_and_size_elf64(ehdr_ptr, &nr_ptnote, &phdr_sz); | |
586 | if (rc < 0) | |
587 | return rc; | |
588 | ||
589 | *notes_sz = roundup(phdr_sz, PAGE_SIZE); | |
83086978 | 590 | *notes_buf = alloc_elfnotes_buf(*notes_sz); |
087350c9 HD |
591 | if (!*notes_buf) |
592 | return -ENOMEM; | |
593 | ||
594 | rc = copy_notes_elf64(ehdr_ptr, *notes_buf); | |
595 | if (rc < 0) | |
596 | return rc; | |
597 | ||
666bfddb VG |
598 | /* Prepare merged PT_NOTE program header. */ |
599 | phdr.p_type = PT_NOTE; | |
600 | phdr.p_flags = 0; | |
601 | note_off = sizeof(Elf64_Ehdr) + | |
602 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr); | |
087350c9 | 603 | phdr.p_offset = roundup(note_off, PAGE_SIZE); |
666bfddb VG |
604 | phdr.p_vaddr = phdr.p_paddr = 0; |
605 | phdr.p_filesz = phdr.p_memsz = phdr_sz; | |
606 | phdr.p_align = 0; | |
607 | ||
608 | /* Add merged PT_NOTE program header*/ | |
609 | tmp = elfptr + sizeof(Elf64_Ehdr); | |
610 | memcpy(tmp, &phdr, sizeof(phdr)); | |
611 | tmp += sizeof(phdr); | |
612 | ||
613 | /* Remove unwanted PT_NOTE program headers. */ | |
614 | i = (nr_ptnote - 1) * sizeof(Elf64_Phdr); | |
615 | *elfsz = *elfsz - i; | |
616 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr))); | |
f2bdacdd HD |
617 | memset(elfptr + *elfsz, 0, i); |
618 | *elfsz = roundup(*elfsz, PAGE_SIZE); | |
666bfddb VG |
619 | |
620 | /* Modify e_phnum to reflect merged headers. */ | |
621 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
087350c9 HD |
626 | /** |
627 | * update_note_header_size_elf32 - update p_memsz member of each PT_NOTE entry | |
628 | * | |
629 | * @ehdr_ptr: ELF header | |
630 | * | |
631 | * This function updates p_memsz member of each PT_NOTE entry in the | |
632 | * program header table pointed to by @ehdr_ptr to real size of ELF | |
633 | * note segment. | |
634 | */ | |
635 | static int __init update_note_header_size_elf32(const Elf32_Ehdr *ehdr_ptr) | |
72658e9d | 636 | { |
087350c9 HD |
637 | int i, rc=0; |
638 | Elf32_Phdr *phdr_ptr; | |
72658e9d | 639 | Elf32_Nhdr *nhdr_ptr; |
72658e9d | 640 | |
087350c9 | 641 | phdr_ptr = (Elf32_Phdr *)(ehdr_ptr + 1); |
72658e9d | 642 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { |
72658e9d | 643 | void *notes_section; |
72658e9d VG |
644 | u64 offset, max_sz, sz, real_sz = 0; |
645 | if (phdr_ptr->p_type != PT_NOTE) | |
646 | continue; | |
72658e9d VG |
647 | max_sz = phdr_ptr->p_memsz; |
648 | offset = phdr_ptr->p_offset; | |
649 | notes_section = kmalloc(max_sz, GFP_KERNEL); | |
650 | if (!notes_section) | |
651 | return -ENOMEM; | |
be8a8d06 | 652 | rc = elfcorehdr_read_notes(notes_section, max_sz, &offset); |
72658e9d VG |
653 | if (rc < 0) { |
654 | kfree(notes_section); | |
655 | return rc; | |
656 | } | |
657 | nhdr_ptr = notes_section; | |
38dfac84 | 658 | while (nhdr_ptr->n_namesz != 0) { |
72658e9d VG |
659 | sz = sizeof(Elf32_Nhdr) + |
660 | ((nhdr_ptr->n_namesz + 3) & ~3) + | |
661 | ((nhdr_ptr->n_descsz + 3) & ~3); | |
38dfac84 GP |
662 | if ((real_sz + sz) > max_sz) { |
663 | pr_warn("Warning: Exceeded p_memsz, dropping PT_NOTE entry n_namesz=0x%x, n_descsz=0x%x\n", | |
664 | nhdr_ptr->n_namesz, nhdr_ptr->n_descsz); | |
665 | break; | |
666 | } | |
72658e9d VG |
667 | real_sz += sz; |
668 | nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz); | |
669 | } | |
72658e9d | 670 | kfree(notes_section); |
087350c9 | 671 | phdr_ptr->p_memsz = real_sz; |
38dfac84 GP |
672 | if (real_sz == 0) { |
673 | pr_warn("Warning: Zero PT_NOTE entries found\n"); | |
674 | return -EINVAL; | |
675 | } | |
087350c9 HD |
676 | } |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | /** | |
682 | * get_note_number_and_size_elf32 - get the number of PT_NOTE program | |
683 | * headers and sum of real size of their ELF note segment headers and | |
684 | * data. | |
685 | * | |
686 | * @ehdr_ptr: ELF header | |
687 | * @nr_ptnote: buffer for the number of PT_NOTE program headers | |
688 | * @sz_ptnote: buffer for size of unique PT_NOTE program header | |
689 | * | |
690 | * This function is used to merge multiple PT_NOTE program headers | |
691 | * into a unique single one. The resulting unique entry will have | |
692 | * @sz_ptnote in its phdr->p_mem. | |
693 | * | |
694 | * It is assumed that program headers with PT_NOTE type pointed to by | |
695 | * @ehdr_ptr has already been updated by update_note_header_size_elf32 | |
696 | * and each of PT_NOTE program headers has actual ELF note segment | |
697 | * size in its p_memsz member. | |
698 | */ | |
699 | static int __init get_note_number_and_size_elf32(const Elf32_Ehdr *ehdr_ptr, | |
700 | int *nr_ptnote, u64 *sz_ptnote) | |
701 | { | |
702 | int i; | |
703 | Elf32_Phdr *phdr_ptr; | |
704 | ||
705 | *nr_ptnote = *sz_ptnote = 0; | |
706 | ||
707 | phdr_ptr = (Elf32_Phdr *)(ehdr_ptr + 1); | |
708 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
709 | if (phdr_ptr->p_type != PT_NOTE) | |
710 | continue; | |
711 | *nr_ptnote += 1; | |
712 | *sz_ptnote += phdr_ptr->p_memsz; | |
72658e9d VG |
713 | } |
714 | ||
087350c9 HD |
715 | return 0; |
716 | } | |
717 | ||
718 | /** | |
719 | * copy_notes_elf32 - copy ELF note segments in a given buffer | |
720 | * | |
721 | * @ehdr_ptr: ELF header | |
722 | * @notes_buf: buffer into which ELF note segments are copied | |
723 | * | |
724 | * This function is used to copy ELF note segment in the 1st kernel | |
725 | * into the buffer @notes_buf in the 2nd kernel. It is assumed that | |
726 | * size of the buffer @notes_buf is equal to or larger than sum of the | |
727 | * real ELF note segment headers and data. | |
728 | * | |
729 | * It is assumed that program headers with PT_NOTE type pointed to by | |
730 | * @ehdr_ptr has already been updated by update_note_header_size_elf32 | |
731 | * and each of PT_NOTE program headers has actual ELF note segment | |
732 | * size in its p_memsz member. | |
733 | */ | |
734 | static int __init copy_notes_elf32(const Elf32_Ehdr *ehdr_ptr, char *notes_buf) | |
735 | { | |
736 | int i, rc=0; | |
737 | Elf32_Phdr *phdr_ptr; | |
738 | ||
739 | phdr_ptr = (Elf32_Phdr*)(ehdr_ptr + 1); | |
740 | ||
741 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
742 | u64 offset; | |
743 | if (phdr_ptr->p_type != PT_NOTE) | |
744 | continue; | |
745 | offset = phdr_ptr->p_offset; | |
be8a8d06 MH |
746 | rc = elfcorehdr_read_notes(notes_buf, phdr_ptr->p_memsz, |
747 | &offset); | |
087350c9 HD |
748 | if (rc < 0) |
749 | return rc; | |
750 | notes_buf += phdr_ptr->p_memsz; | |
751 | } | |
752 | ||
753 | return 0; | |
754 | } | |
755 | ||
756 | /* Merges all the PT_NOTE headers into one. */ | |
757 | static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz, | |
758 | char **notes_buf, size_t *notes_sz) | |
759 | { | |
760 | int i, nr_ptnote=0, rc=0; | |
761 | char *tmp; | |
762 | Elf32_Ehdr *ehdr_ptr; | |
763 | Elf32_Phdr phdr; | |
764 | u64 phdr_sz = 0, note_off; | |
765 | ||
766 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
767 | ||
768 | rc = update_note_header_size_elf32(ehdr_ptr); | |
769 | if (rc < 0) | |
770 | return rc; | |
771 | ||
772 | rc = get_note_number_and_size_elf32(ehdr_ptr, &nr_ptnote, &phdr_sz); | |
773 | if (rc < 0) | |
774 | return rc; | |
775 | ||
776 | *notes_sz = roundup(phdr_sz, PAGE_SIZE); | |
83086978 | 777 | *notes_buf = alloc_elfnotes_buf(*notes_sz); |
087350c9 HD |
778 | if (!*notes_buf) |
779 | return -ENOMEM; | |
780 | ||
781 | rc = copy_notes_elf32(ehdr_ptr, *notes_buf); | |
782 | if (rc < 0) | |
783 | return rc; | |
784 | ||
72658e9d VG |
785 | /* Prepare merged PT_NOTE program header. */ |
786 | phdr.p_type = PT_NOTE; | |
787 | phdr.p_flags = 0; | |
788 | note_off = sizeof(Elf32_Ehdr) + | |
789 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr); | |
087350c9 | 790 | phdr.p_offset = roundup(note_off, PAGE_SIZE); |
72658e9d VG |
791 | phdr.p_vaddr = phdr.p_paddr = 0; |
792 | phdr.p_filesz = phdr.p_memsz = phdr_sz; | |
793 | phdr.p_align = 0; | |
794 | ||
795 | /* Add merged PT_NOTE program header*/ | |
796 | tmp = elfptr + sizeof(Elf32_Ehdr); | |
797 | memcpy(tmp, &phdr, sizeof(phdr)); | |
798 | tmp += sizeof(phdr); | |
799 | ||
800 | /* Remove unwanted PT_NOTE program headers. */ | |
801 | i = (nr_ptnote - 1) * sizeof(Elf32_Phdr); | |
802 | *elfsz = *elfsz - i; | |
803 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr))); | |
f2bdacdd HD |
804 | memset(elfptr + *elfsz, 0, i); |
805 | *elfsz = roundup(*elfsz, PAGE_SIZE); | |
72658e9d VG |
806 | |
807 | /* Modify e_phnum to reflect merged headers. */ | |
808 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
666bfddb VG |
813 | /* Add memory chunks represented by program headers to vmcore list. Also update |
814 | * the new offset fields of exported program headers. */ | |
815 | static int __init process_ptload_program_headers_elf64(char *elfptr, | |
816 | size_t elfsz, | |
087350c9 | 817 | size_t elfnotes_sz, |
666bfddb VG |
818 | struct list_head *vc_list) |
819 | { | |
820 | int i; | |
821 | Elf64_Ehdr *ehdr_ptr; | |
822 | Elf64_Phdr *phdr_ptr; | |
823 | loff_t vmcore_off; | |
824 | struct vmcore *new; | |
825 | ||
826 | ehdr_ptr = (Elf64_Ehdr *)elfptr; | |
827 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */ | |
828 | ||
087350c9 HD |
829 | /* Skip Elf header, program headers and Elf note segment. */ |
830 | vmcore_off = elfsz + elfnotes_sz; | |
666bfddb VG |
831 | |
832 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
7f614cd1 HD |
833 | u64 paddr, start, end, size; |
834 | ||
666bfddb VG |
835 | if (phdr_ptr->p_type != PT_LOAD) |
836 | continue; | |
837 | ||
7f614cd1 HD |
838 | paddr = phdr_ptr->p_offset; |
839 | start = rounddown(paddr, PAGE_SIZE); | |
840 | end = roundup(paddr + phdr_ptr->p_memsz, PAGE_SIZE); | |
841 | size = end - start; | |
842 | ||
666bfddb VG |
843 | /* Add this contiguous chunk of memory to vmcore list.*/ |
844 | new = get_new_element(); | |
845 | if (!new) | |
846 | return -ENOMEM; | |
7f614cd1 HD |
847 | new->paddr = start; |
848 | new->size = size; | |
666bfddb VG |
849 | list_add_tail(&new->list, vc_list); |
850 | ||
851 | /* Update the program header offset. */ | |
7f614cd1 HD |
852 | phdr_ptr->p_offset = vmcore_off + (paddr - start); |
853 | vmcore_off = vmcore_off + size; | |
666bfddb VG |
854 | } |
855 | return 0; | |
856 | } | |
857 | ||
72658e9d VG |
858 | static int __init process_ptload_program_headers_elf32(char *elfptr, |
859 | size_t elfsz, | |
087350c9 | 860 | size_t elfnotes_sz, |
72658e9d VG |
861 | struct list_head *vc_list) |
862 | { | |
863 | int i; | |
864 | Elf32_Ehdr *ehdr_ptr; | |
865 | Elf32_Phdr *phdr_ptr; | |
866 | loff_t vmcore_off; | |
867 | struct vmcore *new; | |
868 | ||
869 | ehdr_ptr = (Elf32_Ehdr *)elfptr; | |
870 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */ | |
871 | ||
087350c9 HD |
872 | /* Skip Elf header, program headers and Elf note segment. */ |
873 | vmcore_off = elfsz + elfnotes_sz; | |
72658e9d VG |
874 | |
875 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { | |
7f614cd1 HD |
876 | u64 paddr, start, end, size; |
877 | ||
72658e9d VG |
878 | if (phdr_ptr->p_type != PT_LOAD) |
879 | continue; | |
880 | ||
7f614cd1 HD |
881 | paddr = phdr_ptr->p_offset; |
882 | start = rounddown(paddr, PAGE_SIZE); | |
883 | end = roundup(paddr + phdr_ptr->p_memsz, PAGE_SIZE); | |
884 | size = end - start; | |
885 | ||
72658e9d VG |
886 | /* Add this contiguous chunk of memory to vmcore list.*/ |
887 | new = get_new_element(); | |
888 | if (!new) | |
889 | return -ENOMEM; | |
7f614cd1 HD |
890 | new->paddr = start; |
891 | new->size = size; | |
72658e9d VG |
892 | list_add_tail(&new->list, vc_list); |
893 | ||
894 | /* Update the program header offset */ | |
7f614cd1 HD |
895 | phdr_ptr->p_offset = vmcore_off + (paddr - start); |
896 | vmcore_off = vmcore_off + size; | |
72658e9d VG |
897 | } |
898 | return 0; | |
899 | } | |
900 | ||
666bfddb | 901 | /* Sets offset fields of vmcore elements. */ |
087350c9 | 902 | static void __init set_vmcore_list_offsets(size_t elfsz, size_t elfnotes_sz, |
f2bdacdd | 903 | struct list_head *vc_list) |
666bfddb VG |
904 | { |
905 | loff_t vmcore_off; | |
666bfddb VG |
906 | struct vmcore *m; |
907 | ||
087350c9 HD |
908 | /* Skip Elf header, program headers and Elf note segment. */ |
909 | vmcore_off = elfsz + elfnotes_sz; | |
666bfddb VG |
910 | |
911 | list_for_each_entry(m, vc_list, list) { | |
912 | m->offset = vmcore_off; | |
913 | vmcore_off += m->size; | |
914 | } | |
915 | } | |
916 | ||
f2bdacdd | 917 | static void free_elfcorebuf(void) |
72658e9d | 918 | { |
f2bdacdd HD |
919 | free_pages((unsigned long)elfcorebuf, get_order(elfcorebuf_sz_orig)); |
920 | elfcorebuf = NULL; | |
087350c9 HD |
921 | vfree(elfnotes_buf); |
922 | elfnotes_buf = NULL; | |
72658e9d VG |
923 | } |
924 | ||
666bfddb VG |
925 | static int __init parse_crash_elf64_headers(void) |
926 | { | |
927 | int rc=0; | |
928 | Elf64_Ehdr ehdr; | |
929 | u64 addr; | |
930 | ||
931 | addr = elfcorehdr_addr; | |
932 | ||
933 | /* Read Elf header */ | |
be8a8d06 | 934 | rc = elfcorehdr_read((char *)&ehdr, sizeof(Elf64_Ehdr), &addr); |
666bfddb VG |
935 | if (rc < 0) |
936 | return rc; | |
937 | ||
938 | /* Do some basic Verification. */ | |
939 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || | |
940 | (ehdr.e_type != ET_CORE) || | |
9833c394 | 941 | !vmcore_elf64_check_arch(&ehdr) || |
666bfddb VG |
942 | ehdr.e_ident[EI_CLASS] != ELFCLASS64 || |
943 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || | |
944 | ehdr.e_version != EV_CURRENT || | |
945 | ehdr.e_ehsize != sizeof(Elf64_Ehdr) || | |
946 | ehdr.e_phentsize != sizeof(Elf64_Phdr) || | |
947 | ehdr.e_phnum == 0) { | |
87ebdc00 | 948 | pr_warn("Warning: Core image elf header is not sane\n"); |
666bfddb VG |
949 | return -EINVAL; |
950 | } | |
951 | ||
952 | /* Read in all elf headers. */ | |
f2bdacdd HD |
953 | elfcorebuf_sz_orig = sizeof(Elf64_Ehdr) + |
954 | ehdr.e_phnum * sizeof(Elf64_Phdr); | |
955 | elfcorebuf_sz = elfcorebuf_sz_orig; | |
956 | elfcorebuf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, | |
957 | get_order(elfcorebuf_sz_orig)); | |
666bfddb VG |
958 | if (!elfcorebuf) |
959 | return -ENOMEM; | |
960 | addr = elfcorehdr_addr; | |
be8a8d06 | 961 | rc = elfcorehdr_read(elfcorebuf, elfcorebuf_sz_orig, &addr); |
f2bdacdd HD |
962 | if (rc < 0) |
963 | goto fail; | |
666bfddb VG |
964 | |
965 | /* Merge all PT_NOTE headers into one. */ | |
087350c9 HD |
966 | rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, |
967 | &elfnotes_buf, &elfnotes_sz); | |
f2bdacdd HD |
968 | if (rc) |
969 | goto fail; | |
666bfddb | 970 | rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz, |
087350c9 | 971 | elfnotes_sz, &vmcore_list); |
f2bdacdd HD |
972 | if (rc) |
973 | goto fail; | |
087350c9 | 974 | set_vmcore_list_offsets(elfcorebuf_sz, elfnotes_sz, &vmcore_list); |
666bfddb | 975 | return 0; |
f2bdacdd HD |
976 | fail: |
977 | free_elfcorebuf(); | |
978 | return rc; | |
666bfddb VG |
979 | } |
980 | ||
72658e9d VG |
981 | static int __init parse_crash_elf32_headers(void) |
982 | { | |
983 | int rc=0; | |
984 | Elf32_Ehdr ehdr; | |
985 | u64 addr; | |
986 | ||
987 | addr = elfcorehdr_addr; | |
988 | ||
989 | /* Read Elf header */ | |
be8a8d06 | 990 | rc = elfcorehdr_read((char *)&ehdr, sizeof(Elf32_Ehdr), &addr); |
72658e9d VG |
991 | if (rc < 0) |
992 | return rc; | |
993 | ||
994 | /* Do some basic Verification. */ | |
995 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || | |
996 | (ehdr.e_type != ET_CORE) || | |
997 | !elf_check_arch(&ehdr) || | |
998 | ehdr.e_ident[EI_CLASS] != ELFCLASS32|| | |
999 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || | |
1000 | ehdr.e_version != EV_CURRENT || | |
1001 | ehdr.e_ehsize != sizeof(Elf32_Ehdr) || | |
1002 | ehdr.e_phentsize != sizeof(Elf32_Phdr) || | |
1003 | ehdr.e_phnum == 0) { | |
87ebdc00 | 1004 | pr_warn("Warning: Core image elf header is not sane\n"); |
72658e9d VG |
1005 | return -EINVAL; |
1006 | } | |
1007 | ||
1008 | /* Read in all elf headers. */ | |
f2bdacdd HD |
1009 | elfcorebuf_sz_orig = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr); |
1010 | elfcorebuf_sz = elfcorebuf_sz_orig; | |
1011 | elfcorebuf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, | |
1012 | get_order(elfcorebuf_sz_orig)); | |
72658e9d VG |
1013 | if (!elfcorebuf) |
1014 | return -ENOMEM; | |
1015 | addr = elfcorehdr_addr; | |
be8a8d06 | 1016 | rc = elfcorehdr_read(elfcorebuf, elfcorebuf_sz_orig, &addr); |
f2bdacdd HD |
1017 | if (rc < 0) |
1018 | goto fail; | |
72658e9d VG |
1019 | |
1020 | /* Merge all PT_NOTE headers into one. */ | |
087350c9 HD |
1021 | rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, |
1022 | &elfnotes_buf, &elfnotes_sz); | |
f2bdacdd HD |
1023 | if (rc) |
1024 | goto fail; | |
72658e9d | 1025 | rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz, |
087350c9 | 1026 | elfnotes_sz, &vmcore_list); |
f2bdacdd HD |
1027 | if (rc) |
1028 | goto fail; | |
087350c9 | 1029 | set_vmcore_list_offsets(elfcorebuf_sz, elfnotes_sz, &vmcore_list); |
72658e9d | 1030 | return 0; |
f2bdacdd HD |
1031 | fail: |
1032 | free_elfcorebuf(); | |
1033 | return rc; | |
72658e9d VG |
1034 | } |
1035 | ||
666bfddb VG |
1036 | static int __init parse_crash_elf_headers(void) |
1037 | { | |
1038 | unsigned char e_ident[EI_NIDENT]; | |
1039 | u64 addr; | |
1040 | int rc=0; | |
1041 | ||
1042 | addr = elfcorehdr_addr; | |
be8a8d06 | 1043 | rc = elfcorehdr_read(e_ident, EI_NIDENT, &addr); |
666bfddb VG |
1044 | if (rc < 0) |
1045 | return rc; | |
1046 | if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) { | |
87ebdc00 | 1047 | pr_warn("Warning: Core image elf header not found\n"); |
666bfddb VG |
1048 | return -EINVAL; |
1049 | } | |
1050 | ||
1051 | if (e_ident[EI_CLASS] == ELFCLASS64) { | |
1052 | rc = parse_crash_elf64_headers(); | |
1053 | if (rc) | |
1054 | return rc; | |
72658e9d VG |
1055 | } else if (e_ident[EI_CLASS] == ELFCLASS32) { |
1056 | rc = parse_crash_elf32_headers(); | |
1057 | if (rc) | |
1058 | return rc; | |
666bfddb | 1059 | } else { |
87ebdc00 | 1060 | pr_warn("Warning: Core image elf header is not sane\n"); |
666bfddb VG |
1061 | return -EINVAL; |
1062 | } | |
591ff716 HD |
1063 | |
1064 | /* Determine vmcore size. */ | |
1065 | vmcore_size = get_vmcore_size(elfcorebuf_sz, elfnotes_sz, | |
1066 | &vmcore_list); | |
1067 | ||
666bfddb VG |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | /* Init function for vmcore module. */ | |
1072 | static int __init vmcore_init(void) | |
1073 | { | |
1074 | int rc = 0; | |
1075 | ||
be8a8d06 MH |
1076 | /* Allow architectures to allocate ELF header in 2nd kernel */ |
1077 | rc = elfcorehdr_alloc(&elfcorehdr_addr, &elfcorehdr_size); | |
1078 | if (rc) | |
1079 | return rc; | |
1080 | /* | |
1081 | * If elfcorehdr= has been passed in cmdline or created in 2nd kernel, | |
1082 | * then capture the dump. | |
1083 | */ | |
85a0ee34 | 1084 | if (!(is_vmcore_usable())) |
666bfddb VG |
1085 | return rc; |
1086 | rc = parse_crash_elf_headers(); | |
1087 | if (rc) { | |
87ebdc00 | 1088 | pr_warn("Kdump: vmcore not initialized\n"); |
666bfddb VG |
1089 | return rc; |
1090 | } | |
be8a8d06 MH |
1091 | elfcorehdr_free(elfcorehdr_addr); |
1092 | elfcorehdr_addr = ELFCORE_ADDR_ERR; | |
666bfddb | 1093 | |
5aa140c2 | 1094 | proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations); |
666bfddb VG |
1095 | if (proc_vmcore) |
1096 | proc_vmcore->size = vmcore_size; | |
1097 | return 0; | |
1098 | } | |
abaf3787 | 1099 | fs_initcall(vmcore_init); |
16257393 MS |
1100 | |
1101 | /* Cleanup function for vmcore module. */ | |
1102 | void vmcore_cleanup(void) | |
1103 | { | |
1104 | struct list_head *pos, *next; | |
1105 | ||
1106 | if (proc_vmcore) { | |
a8ca16ea | 1107 | proc_remove(proc_vmcore); |
16257393 MS |
1108 | proc_vmcore = NULL; |
1109 | } | |
1110 | ||
1111 | /* clear the vmcore list. */ | |
1112 | list_for_each_safe(pos, next, &vmcore_list) { | |
1113 | struct vmcore *m; | |
1114 | ||
1115 | m = list_entry(pos, struct vmcore, list); | |
1116 | list_del(&m->list); | |
1117 | kfree(m); | |
1118 | } | |
f2bdacdd | 1119 | free_elfcorebuf(); |
16257393 MS |
1120 | } |
1121 | EXPORT_SYMBOL_GPL(vmcore_cleanup); |