1 // SPDX-License-Identifier: GPL-2.0-only 1
2 /*
3 * fs/proc/vmcore.c Interface for accessi
4 * dump from the
5 * Heavily borrowed from fs/proc/kcore.c
6 * Created by: Hariprasad Nellitheertha (
7 * Copyright (C) IBM Corporation, 2004. A
8 *
9 */
10
11 #include <linux/mm.h>
12 #include <linux/kcore.h>
13 #include <linux/user.h>
14 #include <linux/elf.h>
15 #include <linux/elfcore.h>
16 #include <linux/export.h>
17 #include <linux/slab.h>
18 #include <linux/highmem.h>
19 #include <linux/printk.h>
20 #include <linux/memblock.h>
21 #include <linux/init.h>
22 #include <linux/crash_dump.h>
23 #include <linux/list.h>
24 #include <linux/moduleparam.h>
25 #include <linux/mutex.h>
26 #include <linux/vmalloc.h>
27 #include <linux/pagemap.h>
28 #include <linux/uio.h>
29 #include <linux/cc_platform.h>
30 #include <asm/io.h>
31 #include "internal.h"
32
33 /* List representing chunks of contiguous memo
34 * vmcore file.
35 */
36 static LIST_HEAD(vmcore_list);
37
38 /* Stores the pointer to the buffer containing
39 static char *elfcorebuf;
40 static size_t elfcorebuf_sz;
41 static size_t elfcorebuf_sz_orig;
42
43 static char *elfnotes_buf;
44 static size_t elfnotes_sz;
45 /* Size of all notes minus the device dump not
46 static size_t elfnotes_orig_sz;
47
48 /* Total size of vmcore file. */
49 static u64 vmcore_size;
50
51 static struct proc_dir_entry *proc_vmcore;
52
53 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
54 /* Device Dump list and mutex to synchronize a
55 static LIST_HEAD(vmcoredd_list);
56 static DEFINE_MUTEX(vmcoredd_mutex);
57
58 static bool vmcoredd_disabled;
59 core_param(novmcoredd, vmcoredd_disabled, bool
60 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
61
62 /* Device Dump Size */
63 static size_t vmcoredd_orig_sz;
64
65 static DEFINE_SPINLOCK(vmcore_cb_lock);
66 DEFINE_STATIC_SRCU(vmcore_cb_srcu);
67 /* List of registered vmcore callbacks. */
68 static LIST_HEAD(vmcore_cb_list);
69 /* Whether the vmcore has been opened once. */
70 static bool vmcore_opened;
71
72 void register_vmcore_cb(struct vmcore_cb *cb)
73 {
74 INIT_LIST_HEAD(&cb->next);
75 spin_lock(&vmcore_cb_lock);
76 list_add_tail(&cb->next, &vmcore_cb_li
77 /*
78 * Registering a vmcore callback after
79 * very unusual (e.g., manual driver l
80 */
81 if (vmcore_opened)
82 pr_warn_once("Unexpected vmcor
83 spin_unlock(&vmcore_cb_lock);
84 }
85 EXPORT_SYMBOL_GPL(register_vmcore_cb);
86
87 void unregister_vmcore_cb(struct vmcore_cb *cb
88 {
89 spin_lock(&vmcore_cb_lock);
90 list_del_rcu(&cb->next);
91 /*
92 * Unregistering a vmcore callback aft
93 * very unusual (e.g., forced driver r
94 * unregistering.
95 */
96 if (vmcore_opened)
97 pr_warn_once("Unexpected vmcor
98 spin_unlock(&vmcore_cb_lock);
99
100 synchronize_srcu(&vmcore_cb_srcu);
101 }
102 EXPORT_SYMBOL_GPL(unregister_vmcore_cb);
103
104 static bool pfn_is_ram(unsigned long pfn)
105 {
106 struct vmcore_cb *cb;
107 bool ret = true;
108
109 list_for_each_entry_srcu(cb, &vmcore_c
110 srcu_read_loc
111 if (unlikely(!cb->pfn_is_ram))
112 continue;
113 ret = cb->pfn_is_ram(cb, pfn);
114 if (!ret)
115 break;
116 }
117
118 return ret;
119 }
120
121 static int open_vmcore(struct inode *inode, st
122 {
123 spin_lock(&vmcore_cb_lock);
124 vmcore_opened = true;
125 spin_unlock(&vmcore_cb_lock);
126
127 return 0;
128 }
129
130 /* Reads a page from the oldmem device from gi
131 ssize_t read_from_oldmem(struct iov_iter *iter
132 u64 *ppos, bool encry
133 {
134 unsigned long pfn, offset;
135 ssize_t nr_bytes;
136 ssize_t read = 0, tmp;
137 int idx;
138
139 if (!count)
140 return 0;
141
142 offset = (unsigned long)(*ppos % PAGE_
143 pfn = (unsigned long)(*ppos / PAGE_SIZ
144
145 idx = srcu_read_lock(&vmcore_cb_srcu);
146 do {
147 if (count > (PAGE_SIZE - offse
148 nr_bytes = PAGE_SIZE -
149 else
150 nr_bytes = count;
151
152 /* If pfn is not ram, return z
153 if (!pfn_is_ram(pfn)) {
154 tmp = iov_iter_zero(nr
155 } else {
156 if (encrypted)
157 tmp = copy_old
158
159
160 else
161 tmp = copy_old
162
163 }
164 if (tmp < nr_bytes) {
165 srcu_read_unlock(&vmco
166 return -EFAULT;
167 }
168
169 *ppos += nr_bytes;
170 count -= nr_bytes;
171 read += nr_bytes;
172 ++pfn;
173 offset = 0;
174 } while (count);
175 srcu_read_unlock(&vmcore_cb_srcu, idx)
176
177 return read;
178 }
179
180 /*
181 * Architectures may override this function to
182 */
183 int __weak elfcorehdr_alloc(unsigned long long
184 {
185 return 0;
186 }
187
188 /*
189 * Architectures may override this function to
190 */
191 void __weak elfcorehdr_free(unsigned long long
192 {}
193
194 /*
195 * Architectures may override this function to
196 */
197 ssize_t __weak elfcorehdr_read(char *buf, size
198 {
199 struct kvec kvec = { .iov_base = buf,
200 struct iov_iter iter;
201
202 iov_iter_kvec(&iter, ITER_DEST, &kvec,
203
204 return read_from_oldmem(&iter, count,
205 }
206
207 /*
208 * Architectures may override this function to
209 */
210 ssize_t __weak elfcorehdr_read_notes(char *buf
211 {
212 struct kvec kvec = { .iov_base = buf,
213 struct iov_iter iter;
214
215 iov_iter_kvec(&iter, ITER_DEST, &kvec,
216
217 return read_from_oldmem(&iter, count,
218 cc_platform_has(CC_ATT
219 }
220
221 /*
222 * Architectures may override this function to
223 */
224 int __weak remap_oldmem_pfn_range(struct vm_ar
225 unsigned lon
226 unsigned lon
227 {
228 prot = pgprot_encrypted(prot);
229 return remap_pfn_range(vma, from, pfn,
230 }
231
232 /*
233 * Architectures which support memory encrypti
234 */
235 ssize_t __weak copy_oldmem_page_encrypted(stru
236 unsigned long pfn, size_t csiz
237 {
238 return copy_oldmem_page(iter, pfn, csi
239 }
240
241 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
242 static int vmcoredd_copy_dumps(struct iov_iter
243 {
244 struct vmcoredd_node *dump;
245 u64 offset = 0;
246 int ret = 0;
247 size_t tsz;
248 char *buf;
249
250 mutex_lock(&vmcoredd_mutex);
251 list_for_each_entry(dump, &vmcoredd_li
252 if (start < offset + dump->siz
253 tsz = min(offset + (u6
254 buf = dump->buf + star
255 if (copy_to_iter(buf,
256 ret = -EFAULT;
257 goto out_unloc
258 }
259
260 size -= tsz;
261 start += tsz;
262
263 /* Leave now if buffer
264 if (!size)
265 goto out_unloc
266 }
267 offset += dump->size;
268 }
269
270 out_unlock:
271 mutex_unlock(&vmcoredd_mutex);
272 return ret;
273 }
274
275 #ifdef CONFIG_MMU
276 static int vmcoredd_mmap_dumps(struct vm_area_
277 u64 start, size
278 {
279 struct vmcoredd_node *dump;
280 u64 offset = 0;
281 int ret = 0;
282 size_t tsz;
283 char *buf;
284
285 mutex_lock(&vmcoredd_mutex);
286 list_for_each_entry(dump, &vmcoredd_li
287 if (start < offset + dump->siz
288 tsz = min(offset + (u6
289 buf = dump->buf + star
290 if (remap_vmalloc_rang
291
292 ret = -EFAULT;
293 goto out_unloc
294 }
295
296 size -= tsz;
297 start += tsz;
298 dst += tsz;
299
300 /* Leave now if buffer
301 if (!size)
302 goto out_unloc
303 }
304 offset += dump->size;
305 }
306
307 out_unlock:
308 mutex_unlock(&vmcoredd_mutex);
309 return ret;
310 }
311 #endif /* CONFIG_MMU */
312 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
313
314 /* Read from the ELF header and then the crash
315 * returned otherwise number of bytes read are
316 */
317 static ssize_t __read_vmcore(struct iov_iter *
318 {
319 ssize_t acc = 0, tmp;
320 size_t tsz;
321 u64 start;
322 struct vmcore *m = NULL;
323
324 if (!iov_iter_count(iter) || *fpos >=
325 return 0;
326
327 iov_iter_truncate(iter, vmcore_size -
328
329 /* Read ELF core header */
330 if (*fpos < elfcorebuf_sz) {
331 tsz = min(elfcorebuf_sz - (siz
332 if (copy_to_iter(elfcorebuf +
333 return -EFAULT;
334 *fpos += tsz;
335 acc += tsz;
336
337 /* leave now if filled buffer
338 if (!iov_iter_count(iter))
339 return acc;
340 }
341
342 /* Read ELF note segment */
343 if (*fpos < elfcorebuf_sz + elfnotes_s
344 void *kaddr;
345
346 /* We add device dumps before
347 * other elf notes may not fil
348 * completely and we will end
349 * between the elf notes and t
350 * then try to decode this zer
351 * and we don't want that. Hen
352 * the other elf notes ensure
353 * avoided.
354 */
355 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
356 /* Read device dumps */
357 if (*fpos < elfcorebuf_sz + vm
358 tsz = min(elfcorebuf_s
359 (size_t)*fpo
360 start = *fpos - elfcor
361 if (vmcoredd_copy_dump
362 return -EFAULT
363
364 *fpos += tsz;
365 acc += tsz;
366
367 /* leave now if filled
368 if (!iov_iter_count(it
369 return acc;
370 }
371 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
372
373 /* Read remaining elf notes */
374 tsz = min(elfcorebuf_sz + elfn
375 iov_iter_count(iter)
376 kaddr = elfnotes_buf + *fpos -
377 if (copy_to_iter(kaddr, tsz, i
378 return -EFAULT;
379
380 *fpos += tsz;
381 acc += tsz;
382
383 /* leave now if filled buffer
384 if (!iov_iter_count(iter))
385 return acc;
386
387 cond_resched();
388 }
389
390 list_for_each_entry(m, &vmcore_list, l
391 if (*fpos < m->offset + m->siz
392 tsz = (size_t)min_t(un
393 m-
394 io
395 start = m->paddr + *fp
396 tmp = read_from_oldmem
397 cc_pla
398 if (tmp < 0)
399 return tmp;
400 *fpos += tsz;
401 acc += tsz;
402
403 /* leave now if filled
404 if (!iov_iter_count(it
405 return acc;
406 }
407 }
408
409 return acc;
410 }
411
412 static ssize_t read_vmcore(struct kiocb *iocb,
413 {
414 return __read_vmcore(iter, &iocb->ki_p
415 }
416
417 /*
418 * The vmcore fault handler uses the page cach
419 * standard __read_vmcore() function.
420 *
421 * On s390 the fault handler is used for memor
422 * directly with remap_pfn_range().
423 */
424 static vm_fault_t mmap_vmcore_fault(struct vm_
425 {
426 #ifdef CONFIG_S390
427 struct address_space *mapping = vmf->v
428 pgoff_t index = vmf->pgoff;
429 struct iov_iter iter;
430 struct kvec kvec;
431 struct page *page;
432 loff_t offset;
433 int rc;
434
435 page = find_or_create_page(mapping, in
436 if (!page)
437 return VM_FAULT_OOM;
438 if (!PageUptodate(page)) {
439 offset = (loff_t) index << PAG
440 kvec.iov_base = page_address(p
441 kvec.iov_len = PAGE_SIZE;
442 iov_iter_kvec(&iter, ITER_DEST
443
444 rc = __read_vmcore(&iter, &off
445 if (rc < 0) {
446 unlock_page(page);
447 put_page(page);
448 return vmf_error(rc);
449 }
450 SetPageUptodate(page);
451 }
452 unlock_page(page);
453 vmf->page = page;
454 return 0;
455 #else
456 return VM_FAULT_SIGBUS;
457 #endif
458 }
459
460 /**
461 * vmcore_alloc_buf - allocate buffer in vmall
462 * @size: size of buffer
463 *
464 * If CONFIG_MMU is defined, use vmalloc_user(
465 * the buffer to user-space by means of remap_
466 *
467 * If CONFIG_MMU is not defined, use vzalloc()
468 * disabled and there's no need to allow users
469 */
470 static inline char *vmcore_alloc_buf(size_t si
471 {
472 #ifdef CONFIG_MMU
473 return vmalloc_user(size);
474 #else
475 return vzalloc(size);
476 #endif
477 }
478
479 /*
480 * Disable mmap_vmcore() if CONFIG_MMU is not
481 * essential for mmap_vmcore() in order to map
482 * non-contiguous objects (ELF header, ELF not
483 * regions in the 1st kernel pointed to by PT_
484 * virtually contiguous user-space in ELF layo
485 */
486 #ifdef CONFIG_MMU
487
488 static const struct vm_operations_struct vmcor
489 .fault = mmap_vmcore_fault,
490 };
491
492 /*
493 * remap_oldmem_pfn_checked - do remap_oldmem_
494 * reported as not being ram with the zero pag
495 *
496 * @vma: vm_area_struct describing requested m
497 * @from: start remapping from
498 * @pfn: page frame number to start remapping
499 * @size: remapping size
500 * @prot: protection bits
501 *
502 * Returns zero on success, -EAGAIN on failure
503 */
504 static int remap_oldmem_pfn_checked(struct vm_
505 unsigned l
506 unsigned l
507 {
508 unsigned long map_size;
509 unsigned long pos_start, pos_end, pos;
510 unsigned long zeropage_pfn = my_zero_p
511 size_t len = 0;
512
513 pos_start = pfn;
514 pos_end = pfn + (size >> PAGE_SHIFT);
515
516 for (pos = pos_start; pos < pos_end; +
517 if (!pfn_is_ram(pos)) {
518 /*
519 * We hit a page which
520 * region between pos_
521 * the non-ram page at
522 */
523 if (pos > pos_start) {
524 /* Remap conti
525 map_size = (po
526 if (remap_oldm
527
528
529 goto f
530 len += map_siz
531 }
532 /* Remap the zero page
533 if (remap_oldmem_pfn_r
534
535
536 goto fail;
537 len += PAGE_SIZE;
538 pos_start = pos + 1;
539 }
540 }
541 if (pos > pos_start) {
542 /* Remap the rest */
543 map_size = (pos - pos_start) <
544 if (remap_oldmem_pfn_range(vma
545 map
546 goto fail;
547 }
548 return 0;
549 fail:
550 do_munmap(vma->vm_mm, from, len, NULL)
551 return -EAGAIN;
552 }
553
554 static int vmcore_remap_oldmem_pfn(struct vm_a
555 unsigned long from
556 unsigned long size
557 {
558 int ret, idx;
559
560 /*
561 * Check if a callback was registered
562 * pages without a reason.
563 */
564 idx = srcu_read_lock(&vmcore_cb_srcu);
565 if (!list_empty(&vmcore_cb_list))
566 ret = remap_oldmem_pfn_checked
567 else
568 ret = remap_oldmem_pfn_range(v
569 srcu_read_unlock(&vmcore_cb_srcu, idx)
570 return ret;
571 }
572
573 static int mmap_vmcore(struct file *file, stru
574 {
575 size_t size = vma->vm_end - vma->vm_st
576 u64 start, end, len, tsz;
577 struct vmcore *m;
578
579 start = (u64)vma->vm_pgoff << PAGE_SHI
580 end = start + size;
581
582 if (size > vmcore_size || end > vmcore
583 return -EINVAL;
584
585 if (vma->vm_flags & (VM_WRITE | VM_EXE
586 return -EPERM;
587
588 vm_flags_mod(vma, VM_MIXEDMAP, VM_MAYW
589 vma->vm_ops = &vmcore_mmap_ops;
590
591 len = 0;
592
593 if (start < elfcorebuf_sz) {
594 u64 pfn;
595
596 tsz = min(elfcorebuf_sz - (siz
597 pfn = __pa(elfcorebuf + start)
598 if (remap_pfn_range(vma, vma->
599 vma->vm_pa
600 return -EAGAIN;
601 size -= tsz;
602 start += tsz;
603 len += tsz;
604
605 if (size == 0)
606 return 0;
607 }
608
609 if (start < elfcorebuf_sz + elfnotes_s
610 void *kaddr;
611
612 /* We add device dumps before
613 * other elf notes may not fil
614 * completely and we will end
615 * between the elf notes and t
616 * then try to decode this zer
617 * and we don't want that. Hen
618 * the other elf notes ensure
619 * avoided. This also ensures
620 * other elf notes can be prop
621 * address.
622 */
623 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
624 /* Read device dumps */
625 if (start < elfcorebuf_sz + vm
626 u64 start_off;
627
628 tsz = min(elfcorebuf_s
629 (size_t)star
630 start_off = start - el
631 if (vmcoredd_mmap_dump
632
633 goto fail;
634
635 size -= tsz;
636 start += tsz;
637 len += tsz;
638
639 /* leave now if filled
640 if (!size)
641 return 0;
642 }
643 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
644
645 /* Read remaining elf notes */
646 tsz = min(elfcorebuf_sz + elfn
647 kaddr = elfnotes_buf + start -
648 if (remap_vmalloc_range_partia
649
650 goto fail;
651
652 size -= tsz;
653 start += tsz;
654 len += tsz;
655
656 if (size == 0)
657 return 0;
658 }
659
660 list_for_each_entry(m, &vmcore_list, l
661 if (start < m->offset + m->siz
662 u64 paddr = 0;
663
664 tsz = (size_t)min_t(un
665 m-
666 paddr = m->paddr + sta
667 if (vmcore_remap_oldme
668
669
670 goto fail;
671 size -= tsz;
672 start += tsz;
673 len += tsz;
674
675 if (size == 0)
676 return 0;
677 }
678 }
679
680 return 0;
681 fail:
682 do_munmap(vma->vm_mm, vma->vm_start, l
683 return -EAGAIN;
684 }
685 #else
686 static int mmap_vmcore(struct file *file, stru
687 {
688 return -ENOSYS;
689 }
690 #endif
691
692 static const struct proc_ops vmcore_proc_ops =
693 .proc_open = open_vmcore,
694 .proc_read_iter = read_vmcore,
695 .proc_lseek = default_llseek,
696 .proc_mmap = mmap_vmcore,
697 };
698
699 static struct vmcore* __init get_new_element(v
700 {
701 return kzalloc(sizeof(struct vmcore),
702 }
703
704 static u64 get_vmcore_size(size_t elfsz, size_
705 struct list_head *v
706 {
707 u64 size;
708 struct vmcore *m;
709
710 size = elfsz + elfnotesegsz;
711 list_for_each_entry(m, vc_list, list)
712 size += m->size;
713 }
714 return size;
715 }
716
717 /**
718 * update_note_header_size_elf64 - update p_me
719 *
720 * @ehdr_ptr: ELF header
721 *
722 * This function updates p_memsz member of eac
723 * program header table pointed to by @ehdr_pt
724 * note segment.
725 */
726 static int __init update_note_header_size_elf6
727 {
728 int i, rc=0;
729 Elf64_Phdr *phdr_ptr;
730 Elf64_Nhdr *nhdr_ptr;
731
732 phdr_ptr = (Elf64_Phdr *)(ehdr_ptr + 1
733 for (i = 0; i < ehdr_ptr->e_phnum; i++
734 void *notes_section;
735 u64 offset, max_sz, sz, real_s
736 if (phdr_ptr->p_type != PT_NOT
737 continue;
738 max_sz = phdr_ptr->p_memsz;
739 offset = phdr_ptr->p_offset;
740 notes_section = kmalloc(max_sz
741 if (!notes_section)
742 return -ENOMEM;
743 rc = elfcorehdr_read_notes(not
744 if (rc < 0) {
745 kfree(notes_section);
746 return rc;
747 }
748 nhdr_ptr = notes_section;
749 while (nhdr_ptr->n_namesz != 0
750 sz = sizeof(Elf64_Nhdr
751 (((u64)nhdr_pt
752 (((u64)nhdr_pt
753 if ((real_sz + sz) > m
754 pr_warn("Warni
755 nhdr_p
756 break;
757 }
758 real_sz += sz;
759 nhdr_ptr = (Elf64_Nhdr
760 }
761 kfree(notes_section);
762 phdr_ptr->p_memsz = real_sz;
763 if (real_sz == 0) {
764 pr_warn("Warning: Zero
765 }
766 }
767
768 return 0;
769 }
770
771 /**
772 * get_note_number_and_size_elf64 - get the nu
773 * headers and sum of real size of their ELF n
774 * data.
775 *
776 * @ehdr_ptr: ELF header
777 * @nr_ptnote: buffer for the number of PT_NOT
778 * @sz_ptnote: buffer for size of unique PT_NO
779 *
780 * This function is used to merge multiple PT_
781 * into a unique single one. The resulting uni
782 * @sz_ptnote in its phdr->p_mem.
783 *
784 * It is assumed that program headers with PT_
785 * @ehdr_ptr has already been updated by updat
786 * and each of PT_NOTE program headers has act
787 * size in its p_memsz member.
788 */
789 static int __init get_note_number_and_size_elf
790
791 {
792 int i;
793 Elf64_Phdr *phdr_ptr;
794
795 *nr_ptnote = *sz_ptnote = 0;
796
797 phdr_ptr = (Elf64_Phdr *)(ehdr_ptr + 1
798 for (i = 0; i < ehdr_ptr->e_phnum; i++
799 if (phdr_ptr->p_type != PT_NOT
800 continue;
801 *nr_ptnote += 1;
802 *sz_ptnote += phdr_ptr->p_mems
803 }
804
805 return 0;
806 }
807
808 /**
809 * copy_notes_elf64 - copy ELF note segments i
810 *
811 * @ehdr_ptr: ELF header
812 * @notes_buf: buffer into which ELF note segm
813 *
814 * This function is used to copy ELF note segm
815 * into the buffer @notes_buf in the 2nd kerne
816 * size of the buffer @notes_buf is equal to o
817 * real ELF note segment headers and data.
818 *
819 * It is assumed that program headers with PT_
820 * @ehdr_ptr has already been updated by updat
821 * and each of PT_NOTE program headers has act
822 * size in its p_memsz member.
823 */
824 static int __init copy_notes_elf64(const Elf64
825 {
826 int i, rc=0;
827 Elf64_Phdr *phdr_ptr;
828
829 phdr_ptr = (Elf64_Phdr*)(ehdr_ptr + 1)
830
831 for (i = 0; i < ehdr_ptr->e_phnum; i++
832 u64 offset;
833 if (phdr_ptr->p_type != PT_NOT
834 continue;
835 offset = phdr_ptr->p_offset;
836 rc = elfcorehdr_read_notes(not
837 &of
838 if (rc < 0)
839 return rc;
840 notes_buf += phdr_ptr->p_memsz
841 }
842
843 return 0;
844 }
845
846 /* Merges all the PT_NOTE headers into one. */
847 static int __init merge_note_headers_elf64(cha
848 cha
849 {
850 int i, nr_ptnote=0, rc=0;
851 char *tmp;
852 Elf64_Ehdr *ehdr_ptr;
853 Elf64_Phdr phdr;
854 u64 phdr_sz = 0, note_off;
855
856 ehdr_ptr = (Elf64_Ehdr *)elfptr;
857
858 rc = update_note_header_size_elf64(ehd
859 if (rc < 0)
860 return rc;
861
862 rc = get_note_number_and_size_elf64(eh
863 if (rc < 0)
864 return rc;
865
866 *notes_sz = roundup(phdr_sz, PAGE_SIZE
867 *notes_buf = vmcore_alloc_buf(*notes_s
868 if (!*notes_buf)
869 return -ENOMEM;
870
871 rc = copy_notes_elf64(ehdr_ptr, *notes
872 if (rc < 0)
873 return rc;
874
875 /* Prepare merged PT_NOTE program head
876 phdr.p_type = PT_NOTE;
877 phdr.p_flags = 0;
878 note_off = sizeof(Elf64_Ehdr) +
879 (ehdr_ptr->e_phnum - n
880 phdr.p_offset = roundup(note_off, PAG
881 phdr.p_vaddr = phdr.p_paddr = 0;
882 phdr.p_filesz = phdr.p_memsz = phdr_s
883 phdr.p_align = 4;
884
885 /* Add merged PT_NOTE program header*/
886 tmp = elfptr + sizeof(Elf64_Ehdr);
887 memcpy(tmp, &phdr, sizeof(phdr));
888 tmp += sizeof(phdr);
889
890 /* Remove unwanted PT_NOTE program hea
891 i = (nr_ptnote - 1) * sizeof(Elf64_Phd
892 *elfsz = *elfsz - i;
893 memmove(tmp, tmp+i, ((*elfsz)-sizeof(E
894 memset(elfptr + *elfsz, 0, i);
895 *elfsz = roundup(*elfsz, PAGE_SIZE);
896
897 /* Modify e_phnum to reflect merged he
898 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum
899
900 /* Store the size of all notes. We ne
901 * header when the device dumps will b
902 */
903 elfnotes_orig_sz = phdr.p_memsz;
904
905 return 0;
906 }
907
908 /**
909 * update_note_header_size_elf32 - update p_me
910 *
911 * @ehdr_ptr: ELF header
912 *
913 * This function updates p_memsz member of eac
914 * program header table pointed to by @ehdr_pt
915 * note segment.
916 */
917 static int __init update_note_header_size_elf3
918 {
919 int i, rc=0;
920 Elf32_Phdr *phdr_ptr;
921 Elf32_Nhdr *nhdr_ptr;
922
923 phdr_ptr = (Elf32_Phdr *)(ehdr_ptr + 1
924 for (i = 0; i < ehdr_ptr->e_phnum; i++
925 void *notes_section;
926 u64 offset, max_sz, sz, real_s
927 if (phdr_ptr->p_type != PT_NOT
928 continue;
929 max_sz = phdr_ptr->p_memsz;
930 offset = phdr_ptr->p_offset;
931 notes_section = kmalloc(max_sz
932 if (!notes_section)
933 return -ENOMEM;
934 rc = elfcorehdr_read_notes(not
935 if (rc < 0) {
936 kfree(notes_section);
937 return rc;
938 }
939 nhdr_ptr = notes_section;
940 while (nhdr_ptr->n_namesz != 0
941 sz = sizeof(Elf32_Nhdr
942 (((u64)nhdr_pt
943 (((u64)nhdr_pt
944 if ((real_sz + sz) > m
945 pr_warn("Warni
946 nhdr_p
947 break;
948 }
949 real_sz += sz;
950 nhdr_ptr = (Elf32_Nhdr
951 }
952 kfree(notes_section);
953 phdr_ptr->p_memsz = real_sz;
954 if (real_sz == 0) {
955 pr_warn("Warning: Zero
956 }
957 }
958
959 return 0;
960 }
961
962 /**
963 * get_note_number_and_size_elf32 - get the nu
964 * headers and sum of real size of their ELF n
965 * data.
966 *
967 * @ehdr_ptr: ELF header
968 * @nr_ptnote: buffer for the number of PT_NOT
969 * @sz_ptnote: buffer for size of unique PT_NO
970 *
971 * This function is used to merge multiple PT_
972 * into a unique single one. The resulting uni
973 * @sz_ptnote in its phdr->p_mem.
974 *
975 * It is assumed that program headers with PT_
976 * @ehdr_ptr has already been updated by updat
977 * and each of PT_NOTE program headers has act
978 * size in its p_memsz member.
979 */
980 static int __init get_note_number_and_size_elf
981
982 {
983 int i;
984 Elf32_Phdr *phdr_ptr;
985
986 *nr_ptnote = *sz_ptnote = 0;
987
988 phdr_ptr = (Elf32_Phdr *)(ehdr_ptr + 1
989 for (i = 0; i < ehdr_ptr->e_phnum; i++
990 if (phdr_ptr->p_type != PT_NOT
991 continue;
992 *nr_ptnote += 1;
993 *sz_ptnote += phdr_ptr->p_mems
994 }
995
996 return 0;
997 }
998
999 /**
1000 * copy_notes_elf32 - copy ELF note segments
1001 *
1002 * @ehdr_ptr: ELF header
1003 * @notes_buf: buffer into which ELF note seg
1004 *
1005 * This function is used to copy ELF note seg
1006 * into the buffer @notes_buf in the 2nd kern
1007 * size of the buffer @notes_buf is equal to
1008 * real ELF note segment headers and data.
1009 *
1010 * It is assumed that program headers with PT
1011 * @ehdr_ptr has already been updated by upda
1012 * and each of PT_NOTE program headers has ac
1013 * size in its p_memsz member.
1014 */
1015 static int __init copy_notes_elf32(const Elf3
1016 {
1017 int i, rc=0;
1018 Elf32_Phdr *phdr_ptr;
1019
1020 phdr_ptr = (Elf32_Phdr*)(ehdr_ptr + 1
1021
1022 for (i = 0; i < ehdr_ptr->e_phnum; i+
1023 u64 offset;
1024 if (phdr_ptr->p_type != PT_NO
1025 continue;
1026 offset = phdr_ptr->p_offset;
1027 rc = elfcorehdr_read_notes(no
1028 &o
1029 if (rc < 0)
1030 return rc;
1031 notes_buf += phdr_ptr->p_mems
1032 }
1033
1034 return 0;
1035 }
1036
1037 /* Merges all the PT_NOTE headers into one. *
1038 static int __init merge_note_headers_elf32(ch
1039 ch
1040 {
1041 int i, nr_ptnote=0, rc=0;
1042 char *tmp;
1043 Elf32_Ehdr *ehdr_ptr;
1044 Elf32_Phdr phdr;
1045 u64 phdr_sz = 0, note_off;
1046
1047 ehdr_ptr = (Elf32_Ehdr *)elfptr;
1048
1049 rc = update_note_header_size_elf32(eh
1050 if (rc < 0)
1051 return rc;
1052
1053 rc = get_note_number_and_size_elf32(e
1054 if (rc < 0)
1055 return rc;
1056
1057 *notes_sz = roundup(phdr_sz, PAGE_SIZ
1058 *notes_buf = vmcore_alloc_buf(*notes_
1059 if (!*notes_buf)
1060 return -ENOMEM;
1061
1062 rc = copy_notes_elf32(ehdr_ptr, *note
1063 if (rc < 0)
1064 return rc;
1065
1066 /* Prepare merged PT_NOTE program hea
1067 phdr.p_type = PT_NOTE;
1068 phdr.p_flags = 0;
1069 note_off = sizeof(Elf32_Ehdr) +
1070 (ehdr_ptr->e_phnum -
1071 phdr.p_offset = roundup(note_off, PA
1072 phdr.p_vaddr = phdr.p_paddr = 0;
1073 phdr.p_filesz = phdr.p_memsz = phdr_
1074 phdr.p_align = 4;
1075
1076 /* Add merged PT_NOTE program header*
1077 tmp = elfptr + sizeof(Elf32_Ehdr);
1078 memcpy(tmp, &phdr, sizeof(phdr));
1079 tmp += sizeof(phdr);
1080
1081 /* Remove unwanted PT_NOTE program he
1082 i = (nr_ptnote - 1) * sizeof(Elf32_Ph
1083 *elfsz = *elfsz - i;
1084 memmove(tmp, tmp+i, ((*elfsz)-sizeof(
1085 memset(elfptr + *elfsz, 0, i);
1086 *elfsz = roundup(*elfsz, PAGE_SIZE);
1087
1088 /* Modify e_phnum to reflect merged h
1089 ehdr_ptr->e_phnum = ehdr_ptr->e_phnum
1090
1091 /* Store the size of all notes. We n
1092 * header when the device dumps will
1093 */
1094 elfnotes_orig_sz = phdr.p_memsz;
1095
1096 return 0;
1097 }
1098
1099 /* Add memory chunks represented by program h
1100 * the new offset fields of exported program
1101 static int __init process_ptload_program_head
1102
1103
1104
1105 {
1106 int i;
1107 Elf64_Ehdr *ehdr_ptr;
1108 Elf64_Phdr *phdr_ptr;
1109 loff_t vmcore_off;
1110 struct vmcore *new;
1111
1112 ehdr_ptr = (Elf64_Ehdr *)elfptr;
1113 phdr_ptr = (Elf64_Phdr*)(elfptr + siz
1114
1115 /* Skip ELF header, program headers a
1116 vmcore_off = elfsz + elfnotes_sz;
1117
1118 for (i = 0; i < ehdr_ptr->e_phnum; i+
1119 u64 paddr, start, end, size;
1120
1121 if (phdr_ptr->p_type != PT_LO
1122 continue;
1123
1124 paddr = phdr_ptr->p_offset;
1125 start = rounddown(paddr, PAGE
1126 end = roundup(paddr + phdr_pt
1127 size = end - start;
1128
1129 /* Add this contiguous chunk
1130 new = get_new_element();
1131 if (!new)
1132 return -ENOMEM;
1133 new->paddr = start;
1134 new->size = size;
1135 list_add_tail(&new->list, vc_
1136
1137 /* Update the program header
1138 phdr_ptr->p_offset = vmcore_o
1139 vmcore_off = vmcore_off + siz
1140 }
1141 return 0;
1142 }
1143
1144 static int __init process_ptload_program_head
1145
1146
1147
1148 {
1149 int i;
1150 Elf32_Ehdr *ehdr_ptr;
1151 Elf32_Phdr *phdr_ptr;
1152 loff_t vmcore_off;
1153 struct vmcore *new;
1154
1155 ehdr_ptr = (Elf32_Ehdr *)elfptr;
1156 phdr_ptr = (Elf32_Phdr*)(elfptr + siz
1157
1158 /* Skip ELF header, program headers a
1159 vmcore_off = elfsz + elfnotes_sz;
1160
1161 for (i = 0; i < ehdr_ptr->e_phnum; i+
1162 u64 paddr, start, end, size;
1163
1164 if (phdr_ptr->p_type != PT_LO
1165 continue;
1166
1167 paddr = phdr_ptr->p_offset;
1168 start = rounddown(paddr, PAGE
1169 end = roundup(paddr + phdr_pt
1170 size = end - start;
1171
1172 /* Add this contiguous chunk
1173 new = get_new_element();
1174 if (!new)
1175 return -ENOMEM;
1176 new->paddr = start;
1177 new->size = size;
1178 list_add_tail(&new->list, vc_
1179
1180 /* Update the program header
1181 phdr_ptr->p_offset = vmcore_o
1182 vmcore_off = vmcore_off + siz
1183 }
1184 return 0;
1185 }
1186
1187 /* Sets offset fields of vmcore elements. */
1188 static void set_vmcore_list_offsets(size_t el
1189 struct li
1190 {
1191 loff_t vmcore_off;
1192 struct vmcore *m;
1193
1194 /* Skip ELF header, program headers a
1195 vmcore_off = elfsz + elfnotes_sz;
1196
1197 list_for_each_entry(m, vc_list, list)
1198 m->offset = vmcore_off;
1199 vmcore_off += m->size;
1200 }
1201 }
1202
1203 static void free_elfcorebuf(void)
1204 {
1205 free_pages((unsigned long)elfcorebuf,
1206 elfcorebuf = NULL;
1207 vfree(elfnotes_buf);
1208 elfnotes_buf = NULL;
1209 }
1210
1211 static int __init parse_crash_elf64_headers(v
1212 {
1213 int rc=0;
1214 Elf64_Ehdr ehdr;
1215 u64 addr;
1216
1217 addr = elfcorehdr_addr;
1218
1219 /* Read ELF header */
1220 rc = elfcorehdr_read((char *)&ehdr, s
1221 if (rc < 0)
1222 return rc;
1223
1224 /* Do some basic Verification. */
1225 if (memcmp(ehdr.e_ident, ELFMAG, SELF
1226 (ehdr.e_type != ET_CORE) ||
1227 !vmcore_elf64_check_arch(&ehd
1228 ehdr.e_ident[EI_CLASS] != ELF
1229 ehdr.e_ident[EI_VERSION] != E
1230 ehdr.e_version != EV_CURRENT
1231 ehdr.e_ehsize != sizeof(Elf64
1232 ehdr.e_phentsize != sizeof(El
1233 ehdr.e_phnum == 0) {
1234 pr_warn("Warning: Core image
1235 return -EINVAL;
1236 }
1237
1238 /* Read in all elf headers. */
1239 elfcorebuf_sz_orig = sizeof(Elf64_Ehd
1240 ehdr.e_phnum
1241 elfcorebuf_sz = elfcorebuf_sz_orig;
1242 elfcorebuf = (void *)__get_free_pages
1243
1244 if (!elfcorebuf)
1245 return -ENOMEM;
1246 addr = elfcorehdr_addr;
1247 rc = elfcorehdr_read(elfcorebuf, elfc
1248 if (rc < 0)
1249 goto fail;
1250
1251 /* Merge all PT_NOTE headers into one
1252 rc = merge_note_headers_elf64(elfcore
1253 &elfnot
1254 if (rc)
1255 goto fail;
1256 rc = process_ptload_program_headers_e
1257
1258 if (rc)
1259 goto fail;
1260 set_vmcore_list_offsets(elfcorebuf_sz
1261 return 0;
1262 fail:
1263 free_elfcorebuf();
1264 return rc;
1265 }
1266
1267 static int __init parse_crash_elf32_headers(v
1268 {
1269 int rc=0;
1270 Elf32_Ehdr ehdr;
1271 u64 addr;
1272
1273 addr = elfcorehdr_addr;
1274
1275 /* Read ELF header */
1276 rc = elfcorehdr_read((char *)&ehdr, s
1277 if (rc < 0)
1278 return rc;
1279
1280 /* Do some basic Verification. */
1281 if (memcmp(ehdr.e_ident, ELFMAG, SELF
1282 (ehdr.e_type != ET_CORE) ||
1283 !vmcore_elf32_check_arch(&ehd
1284 ehdr.e_ident[EI_CLASS] != ELF
1285 ehdr.e_ident[EI_VERSION] != E
1286 ehdr.e_version != EV_CURRENT
1287 ehdr.e_ehsize != sizeof(Elf32
1288 ehdr.e_phentsize != sizeof(El
1289 ehdr.e_phnum == 0) {
1290 pr_warn("Warning: Core image
1291 return -EINVAL;
1292 }
1293
1294 /* Read in all elf headers. */
1295 elfcorebuf_sz_orig = sizeof(Elf32_Ehd
1296 elfcorebuf_sz = elfcorebuf_sz_orig;
1297 elfcorebuf = (void *)__get_free_pages
1298
1299 if (!elfcorebuf)
1300 return -ENOMEM;
1301 addr = elfcorehdr_addr;
1302 rc = elfcorehdr_read(elfcorebuf, elfc
1303 if (rc < 0)
1304 goto fail;
1305
1306 /* Merge all PT_NOTE headers into one
1307 rc = merge_note_headers_elf32(elfcore
1308 &elfnot
1309 if (rc)
1310 goto fail;
1311 rc = process_ptload_program_headers_e
1312
1313 if (rc)
1314 goto fail;
1315 set_vmcore_list_offsets(elfcorebuf_sz
1316 return 0;
1317 fail:
1318 free_elfcorebuf();
1319 return rc;
1320 }
1321
1322 static int __init parse_crash_elf_headers(voi
1323 {
1324 unsigned char e_ident[EI_NIDENT];
1325 u64 addr;
1326 int rc=0;
1327
1328 addr = elfcorehdr_addr;
1329 rc = elfcorehdr_read(e_ident, EI_NIDE
1330 if (rc < 0)
1331 return rc;
1332 if (memcmp(e_ident, ELFMAG, SELFMAG)
1333 pr_warn("Warning: Core image
1334 return -EINVAL;
1335 }
1336
1337 if (e_ident[EI_CLASS] == ELFCLASS64)
1338 rc = parse_crash_elf64_header
1339 if (rc)
1340 return rc;
1341 } else if (e_ident[EI_CLASS] == ELFCL
1342 rc = parse_crash_elf32_header
1343 if (rc)
1344 return rc;
1345 } else {
1346 pr_warn("Warning: Core image
1347 return -EINVAL;
1348 }
1349
1350 /* Determine vmcore size. */
1351 vmcore_size = get_vmcore_size(elfcore
1352 &vmcore
1353
1354 return 0;
1355 }
1356
1357 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
1358 /**
1359 * vmcoredd_write_header - Write vmcore devic
1360 * beginning of the dump's buffer.
1361 * @buf: Output buffer where the note is writ
1362 * @data: Dump info
1363 * @size: Size of the dump
1364 *
1365 * Fills beginning of the dump's buffer with
1366 */
1367 static void vmcoredd_write_header(void *buf,
1368 u32 size)
1369 {
1370 struct vmcoredd_header *vdd_hdr = (st
1371
1372 vdd_hdr->n_namesz = sizeof(vdd_hdr->n
1373 vdd_hdr->n_descsz = size + sizeof(vdd
1374 vdd_hdr->n_type = NT_VMCOREDD;
1375
1376 strscpy_pad(vdd_hdr->name, VMCOREDD_N
1377 strscpy_pad(vdd_hdr->dump_name, data-
1378 }
1379
1380 /**
1381 * vmcoredd_update_program_headers - Update a
1382 * @elfptr: Pointer to elf header
1383 * @elfnotesz: Size of elf notes aligned to p
1384 * @vmcoreddsz: Size of device dumps to be ad
1385 *
1386 * Determine type of ELF header (Elf64 or Elf
1387 * Also update the offsets of all the program
1388 */
1389 static void vmcoredd_update_program_headers(c
1390 s
1391 {
1392 unsigned char *e_ident = (unsigned ch
1393 u64 start, end, size;
1394 loff_t vmcore_off;
1395 u32 i;
1396
1397 vmcore_off = elfcorebuf_sz + elfnotes
1398
1399 if (e_ident[EI_CLASS] == ELFCLASS64)
1400 Elf64_Ehdr *ehdr = (Elf64_Ehd
1401 Elf64_Phdr *phdr = (Elf64_Phd
1402
1403 /* Update all program headers
1404 for (i = 0; i < ehdr->e_phnum
1405 if (phdr->p_type == P
1406 /* Update not
1407 phdr->p_memsz
1408 phdr->p_files
1409 continue;
1410 }
1411
1412 start = rounddown(phd
1413 end = roundup(phdr->p
1414 PAGE_SI
1415 size = end - start;
1416 phdr->p_offset = vmco
1417 vmcore_off += size;
1418 }
1419 } else {
1420 Elf32_Ehdr *ehdr = (Elf32_Ehd
1421 Elf32_Phdr *phdr = (Elf32_Phd
1422
1423 /* Update all program headers
1424 for (i = 0; i < ehdr->e_phnum
1425 if (phdr->p_type == P
1426 /* Update not
1427 phdr->p_memsz
1428 phdr->p_files
1429 continue;
1430 }
1431
1432 start = rounddown(phd
1433 end = roundup(phdr->p
1434 PAGE_SI
1435 size = end - start;
1436 phdr->p_offset = vmco
1437 vmcore_off += size;
1438 }
1439 }
1440 }
1441
1442 /**
1443 * vmcoredd_update_size - Update the total si
1444 * ELF header
1445 * @dump_size: Size of the current device dum
1446 *
1447 * Update the total size of all the device du
1448 * headers. Calculate the new offsets for the
1449 * total vmcore size.
1450 */
1451 static void vmcoredd_update_size(size_t dump_
1452 {
1453 vmcoredd_orig_sz += dump_size;
1454 elfnotes_sz = roundup(elfnotes_orig_s
1455 vmcoredd_update_program_headers(elfco
1456 vmcor
1457
1458 /* Update vmcore list offsets */
1459 set_vmcore_list_offsets(elfcorebuf_sz
1460
1461 vmcore_size = get_vmcore_size(elfcore
1462 &vmcore
1463 proc_vmcore->size = vmcore_size;
1464 }
1465
1466 /**
1467 * vmcore_add_device_dump - Add a buffer cont
1468 * @data: dump info.
1469 *
1470 * Allocate a buffer and invoke the calling d
1471 * Write ELF note at the beginning of the buf
1472 * dump and add the dump to global list.
1473 */
1474 int vmcore_add_device_dump(struct vmcoredd_da
1475 {
1476 struct vmcoredd_node *dump;
1477 void *buf = NULL;
1478 size_t data_size;
1479 int ret;
1480
1481 if (vmcoredd_disabled) {
1482 pr_err_once("Device dump is d
1483 return -EINVAL;
1484 }
1485
1486 if (!data || !strlen(data->dump_name)
1487 !data->vmcoredd_callback || !data
1488 return -EINVAL;
1489
1490 dump = vzalloc(sizeof(*dump));
1491 if (!dump) {
1492 ret = -ENOMEM;
1493 goto out_err;
1494 }
1495
1496 /* Keep size of the buffer page align
1497 data_size = roundup(sizeof(struct vmc
1498 PAGE_SIZE);
1499
1500 /* Allocate buffer for driver's to wr
1501 buf = vmcore_alloc_buf(data_size);
1502 if (!buf) {
1503 ret = -ENOMEM;
1504 goto out_err;
1505 }
1506
1507 vmcoredd_write_header(buf, data, data
1508 sizeof(struct v
1509
1510 /* Invoke the driver's dump collectio
1511 ret = data->vmcoredd_callback(data, b
1512 sizeof(
1513 if (ret)
1514 goto out_err;
1515
1516 dump->buf = buf;
1517 dump->size = data_size;
1518
1519 /* Add the dump to driver sysfs list
1520 mutex_lock(&vmcoredd_mutex);
1521 list_add_tail(&dump->list, &vmcoredd_
1522 mutex_unlock(&vmcoredd_mutex);
1523
1524 vmcoredd_update_size(data_size);
1525 return 0;
1526
1527 out_err:
1528 vfree(buf);
1529 vfree(dump);
1530
1531 return ret;
1532 }
1533 EXPORT_SYMBOL(vmcore_add_device_dump);
1534 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
1535
1536 /* Free all dumps in vmcore device dump list
1537 static void vmcore_free_device_dumps(void)
1538 {
1539 #ifdef CONFIG_PROC_VMCORE_DEVICE_DUMP
1540 mutex_lock(&vmcoredd_mutex);
1541 while (!list_empty(&vmcoredd_list)) {
1542 struct vmcoredd_node *dump;
1543
1544 dump = list_first_entry(&vmco
1545 list)
1546 list_del(&dump->list);
1547 vfree(dump->buf);
1548 vfree(dump);
1549 }
1550 mutex_unlock(&vmcoredd_mutex);
1551 #endif /* CONFIG_PROC_VMCORE_DEVICE_DUMP */
1552 }
1553
1554 /* Init function for vmcore module. */
1555 static int __init vmcore_init(void)
1556 {
1557 int rc = 0;
1558
1559 /* Allow architectures to allocate EL
1560 rc = elfcorehdr_alloc(&elfcorehdr_add
1561 if (rc)
1562 return rc;
1563 /*
1564 * If elfcorehdr= has been passed in
1565 * then capture the dump.
1566 */
1567 if (!(is_vmcore_usable()))
1568 return rc;
1569 rc = parse_crash_elf_headers();
1570 if (rc) {
1571 elfcorehdr_free(elfcorehdr_ad
1572 pr_warn("Kdump: vmcore not in
1573 return rc;
1574 }
1575 elfcorehdr_free(elfcorehdr_addr);
1576 elfcorehdr_addr = ELFCORE_ADDR_ERR;
1577
1578 proc_vmcore = proc_create("vmcore", S
1579 if (proc_vmcore)
1580 proc_vmcore->size = vmcore_si
1581 return 0;
1582 }
1583 fs_initcall(vmcore_init);
1584
1585 /* Cleanup function for vmcore module. */
1586 void vmcore_cleanup(void)
1587 {
1588 if (proc_vmcore) {
1589 proc_remove(proc_vmcore);
1590 proc_vmcore = NULL;
1591 }
1592
1593 /* clear the vmcore list. */
1594 while (!list_empty(&vmcore_list)) {
1595 struct vmcore *m;
1596
1597 m = list_first_entry(&vmcore_
1598 list_del(&m->list);
1599 kfree(m);
1600 }
1601 free_elfcorebuf();
1602
1603 /* clear vmcore device dump list */
1604 vmcore_free_device_dumps();
1605 }
1606
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