654 lines
16 KiB
C
654 lines
16 KiB
C
|
/*
|
||
|
|
* fs/proc/vmcore.c Interface for accessing the crash
|
||
|
|
* dump from the system's previous life.
|
||
|
|
* Heavily borrowed from fs/proc/kcore.c
|
||
|
|
* Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
|
||
|
|
* Copyright (C) IBM Corporation, 2004. All rights reserved
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/proc_fs.h>
|
||
|
|
#include <linux/user.h>
|
||
|
|
#include <linux/elf.h>
|
||
|
|
#include <linux/elfcore.h>
|
||
|
|
#include <linux/highmem.h>
|
||
|
|
#include <linux/bootmem.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/crash_dump.h>
|
||
|
|
#include <linux/list.h>
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
|
||
|
|
/* List representing chunks of contiguous memory areas and their offsets in
|
||
|
|
* vmcore file.
|
||
|
|
*/
|
||
|
|
static LIST_HEAD(vmcore_list);
|
||
|
|
|
||
|
|
/* Stores the pointer to the buffer containing kernel elf core headers. */
|
||
|
|
static char *elfcorebuf;
|
||
|
|
static size_t elfcorebuf_sz;
|
||
|
|
|
||
|
|
/* Total size of vmcore file. */
|
||
|
|
static u64 vmcore_size;
|
||
|
|
|
||
|
|
static struct proc_dir_entry *proc_vmcore = NULL;
|
||
|
|
|
||
|
|
/* Reads a page from the oldmem device from given offset. */
|
||
|
|
static ssize_t read_from_oldmem(char *buf, size_t count,
|
||
|
|
u64 *ppos, int userbuf)
|
||
|
|
{
|
||
|
|
unsigned long pfn, offset;
|
||
|
|
size_t nr_bytes;
|
||
|
|
ssize_t read = 0, tmp;
|
||
|
|
|
||
|
|
if (!count)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
offset = (unsigned long)(*ppos % PAGE_SIZE);
|
||
|
|
pfn = (unsigned long)(*ppos / PAGE_SIZE);
|
||
|
|
|
||
|
|
do {
|
||
|
|
if (count > (PAGE_SIZE - offset))
|
||
|
|
nr_bytes = PAGE_SIZE - offset;
|
||
|
|
else
|
||
|
|
nr_bytes = count;
|
||
|
|
|
||
|
|
tmp = copy_oldmem_page(pfn, buf, nr_bytes, offset, userbuf);
|
||
|
|
if (tmp < 0)
|
||
|
|
return tmp;
|
||
|
|
*ppos += nr_bytes;
|
||
|
|
count -= nr_bytes;
|
||
|
|
buf += nr_bytes;
|
||
|
|
read += nr_bytes;
|
||
|
|
++pfn;
|
||
|
|
offset = 0;
|
||
|
|
} while (count);
|
||
|
|
|
||
|
|
return read;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Maps vmcore file offset to respective physical address in memroy. */
|
||
|
|
static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list,
|
||
|
|
struct vmcore **m_ptr)
|
||
|
|
{
|
||
|
|
struct vmcore *m;
|
||
|
|
u64 paddr;
|
||
|
|
|
||
|
|
list_for_each_entry(m, vc_list, list) {
|
||
|
|
u64 start, end;
|
||
|
|
start = m->offset;
|
||
|
|
end = m->offset + m->size - 1;
|
||
|
|
if (offset >= start && offset <= end) {
|
||
|
|
paddr = m->paddr + offset - start;
|
||
|
|
*m_ptr = m;
|
||
|
|
return paddr;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
*m_ptr = NULL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Read from the ELF header and then the crash dump. On error, negative value is
|
||
|
|
* returned otherwise number of bytes read are returned.
|
||
|
|
*/
|
||
|
|
static ssize_t read_vmcore(struct file *file, char __user *buffer,
|
||
|
|
size_t buflen, loff_t *fpos)
|
||
|
|
{
|
||
|
|
ssize_t acc = 0, tmp;
|
||
|
|
size_t tsz;
|
||
|
|
u64 start, nr_bytes;
|
||
|
|
struct vmcore *curr_m = NULL;
|
||
|
|
|
||
|
|
if (buflen == 0 || *fpos >= vmcore_size)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* trim buflen to not go beyond EOF */
|
||
|
|
if (buflen > vmcore_size - *fpos)
|
||
|
|
buflen = vmcore_size - *fpos;
|
||
|
|
|
||
|
|
/* Read ELF core header */
|
||
|
|
if (*fpos < elfcorebuf_sz) {
|
||
|
|
tsz = elfcorebuf_sz - *fpos;
|
||
|
|
if (buflen < tsz)
|
||
|
|
tsz = buflen;
|
||
|
|
if (copy_to_user(buffer, elfcorebuf + *fpos, tsz))
|
||
|
|
return -EFAULT;
|
||
|
|
buflen -= tsz;
|
||
|
|
*fpos += tsz;
|
||
|
|
buffer += tsz;
|
||
|
|
acc += tsz;
|
||
|
|
|
||
|
|
/* leave now if filled buffer already */
|
||
|
|
if (buflen == 0)
|
||
|
|
return acc;
|
||
|
|
}
|
||
|
|
|
||
|
|
start = map_offset_to_paddr(*fpos, &vmcore_list, &curr_m);
|
||
|
|
if (!curr_m)
|
||
|
|
return -EINVAL;
|
||
|
|
if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
|
||
|
|
tsz = buflen;
|
||
|
|
|
||
|
|
/* Calculate left bytes in current memory segment. */
|
||
|
|
nr_bytes = (curr_m->size - (start - curr_m->paddr));
|
||
|
|
if (tsz > nr_bytes)
|
||
|
|
tsz = nr_bytes;
|
||
|
|
|
||
|
|
while (buflen) {
|
||
|
|
tmp = read_from_oldmem(buffer, tsz, &start, 1);
|
||
|
|
if (tmp < 0)
|
||
|
|
return tmp;
|
||
|
|
buflen -= tsz;
|
||
|
|
*fpos += tsz;
|
||
|
|
buffer += tsz;
|
||
|
|
acc += tsz;
|
||
|
|
if (start >= (curr_m->paddr + curr_m->size)) {
|
||
|
|
if (curr_m->list.next == &vmcore_list)
|
||
|
|
return acc; /*EOF*/
|
||
|
|
curr_m = list_entry(curr_m->list.next,
|
||
|
|
struct vmcore, list);
|
||
|
|
start = curr_m->paddr;
|
||
|
|
}
|
||
|
|
if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
|
||
|
|
tsz = buflen;
|
||
|
|
/* Calculate left bytes in current memory segment. */
|
||
|
|
nr_bytes = (curr_m->size - (start - curr_m->paddr));
|
||
|
|
if (tsz > nr_bytes)
|
||
|
|
tsz = nr_bytes;
|
||
|
|
}
|
||
|
|
return acc;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct file_operations proc_vmcore_operations = {
|
||
|
|
.read = read_vmcore,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct vmcore* __init get_new_element(void)
|
||
|
|
{
|
||
|
|
return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static u64 __init get_vmcore_size_elf64(char *elfptr)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
u64 size;
|
||
|
|
Elf64_Ehdr *ehdr_ptr;
|
||
|
|
Elf64_Phdr *phdr_ptr;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf64_Ehdr *)elfptr;
|
||
|
|
phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
|
||
|
|
size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr));
|
||
|
|
for (i = 0; i < ehdr_ptr->e_phnum; i++) {
|
||
|
|
size += phdr_ptr->p_memsz;
|
||
|
|
phdr_ptr++;
|
||
|
|
}
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static u64 __init get_vmcore_size_elf32(char *elfptr)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
u64 size;
|
||
|
|
Elf32_Ehdr *ehdr_ptr;
|
||
|
|
Elf32_Phdr *phdr_ptr;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf32_Ehdr *)elfptr;
|
||
|
|
phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
|
||
|
|
size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr));
|
||
|
|
for (i = 0; i < ehdr_ptr->e_phnum; i++) {
|
||
|
|
size += phdr_ptr->p_memsz;
|
||
|
|
phdr_ptr++;
|
||
|
|
}
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Merges all the PT_NOTE headers into one. */
|
||
|
|
static int __init merge_note_headers_elf64(char *elfptr, size_t *elfsz,
|
||
|
|
struct list_head *vc_list)
|
||
|
|
{
|
||
|
|
int i, nr_ptnote=0, rc=0;
|
||
|
|
char *tmp;
|
||
|
|
Elf64_Ehdr *ehdr_ptr;
|
||
|
|
Elf64_Phdr phdr, *phdr_ptr;
|
||
|
|
Elf64_Nhdr *nhdr_ptr;
|
||
|
|
u64 phdr_sz = 0, note_off;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf64_Ehdr *)elfptr;
|
||
|
|
phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr));
|
||
|
|
for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
|
||
|
|
int j;
|
||
|
|
void *notes_section;
|
||
|
|
struct vmcore *new;
|
||
|
|
u64 offset, max_sz, sz, real_sz = 0;
|
||
|
|
if (phdr_ptr->p_type != PT_NOTE)
|
||
|
|
continue;
|
||
|
|
nr_ptnote++;
|
||
|
|
max_sz = phdr_ptr->p_memsz;
|
||
|
|
offset = phdr_ptr->p_offset;
|
||
|
|
notes_section = kmalloc(max_sz, GFP_KERNEL);
|
||
|
|
if (!notes_section)
|
||
|
|
return -ENOMEM;
|
||
|
|
rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
|
||
|
|
if (rc < 0) {
|
||
|
|
kfree(notes_section);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
nhdr_ptr = notes_section;
|
||
|
|
for (j = 0; j < max_sz; j += sz) {
|
||
|
|
if (nhdr_ptr->n_namesz == 0)
|
||
|
|
break;
|
||
|
|
sz = sizeof(Elf64_Nhdr) +
|
||
|
|
((nhdr_ptr->n_namesz + 3) & ~3) +
|
||
|
|
((nhdr_ptr->n_descsz + 3) & ~3);
|
||
|
|
real_sz += sz;
|
||
|
|
nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Add this contiguous chunk of notes section to vmcore list.*/
|
||
|
|
new = get_new_element();
|
||
|
|
if (!new) {
|
||
|
|
kfree(notes_section);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
new->paddr = phdr_ptr->p_offset;
|
||
|
|
new->size = real_sz;
|
||
|
|
list_add_tail(&new->list, vc_list);
|
||
|
|
phdr_sz += real_sz;
|
||
|
|
kfree(notes_section);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Prepare merged PT_NOTE program header. */
|
||
|
|
phdr.p_type = PT_NOTE;
|
||
|
|
phdr.p_flags = 0;
|
||
|
|
note_off = sizeof(Elf64_Ehdr) +
|
||
|
|
(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr);
|
||
|
|
phdr.p_offset = note_off;
|
||
|
|
phdr.p_vaddr = phdr.p_paddr = 0;
|
||
|
|
phdr.p_filesz = phdr.p_memsz = phdr_sz;
|
||
|
|
phdr.p_align = 0;
|
||
|
|
|
||
|
|
/* Add merged PT_NOTE program header*/
|
||
|
|
tmp = elfptr + sizeof(Elf64_Ehdr);
|
||
|
|
memcpy(tmp, &phdr, sizeof(phdr));
|
||
|
|
tmp += sizeof(phdr);
|
||
|
|
|
||
|
|
/* Remove unwanted PT_NOTE program headers. */
|
||
|
|
i = (nr_ptnote - 1) * sizeof(Elf64_Phdr);
|
||
|
|
*elfsz = *elfsz - i;
|
||
|
|
memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr)));
|
||
|
|
|
||
|
|
/* Modify e_phnum to reflect merged headers. */
|
||
|
|
ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Merges all the PT_NOTE headers into one. */
|
||
|
|
static int __init merge_note_headers_elf32(char *elfptr, size_t *elfsz,
|
||
|
|
struct list_head *vc_list)
|
||
|
|
{
|
||
|
|
int i, nr_ptnote=0, rc=0;
|
||
|
|
char *tmp;
|
||
|
|
Elf32_Ehdr *ehdr_ptr;
|
||
|
|
Elf32_Phdr phdr, *phdr_ptr;
|
||
|
|
Elf32_Nhdr *nhdr_ptr;
|
||
|
|
u64 phdr_sz = 0, note_off;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf32_Ehdr *)elfptr;
|
||
|
|
phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr));
|
||
|
|
for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
|
||
|
|
int j;
|
||
|
|
void *notes_section;
|
||
|
|
struct vmcore *new;
|
||
|
|
u64 offset, max_sz, sz, real_sz = 0;
|
||
|
|
if (phdr_ptr->p_type != PT_NOTE)
|
||
|
|
continue;
|
||
|
|
nr_ptnote++;
|
||
|
|
max_sz = phdr_ptr->p_memsz;
|
||
|
|
offset = phdr_ptr->p_offset;
|
||
|
|
notes_section = kmalloc(max_sz, GFP_KERNEL);
|
||
|
|
if (!notes_section)
|
||
|
|
return -ENOMEM;
|
||
|
|
rc = read_from_oldmem(notes_section, max_sz, &offset, 0);
|
||
|
|
if (rc < 0) {
|
||
|
|
kfree(notes_section);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
nhdr_ptr = notes_section;
|
||
|
|
for (j = 0; j < max_sz; j += sz) {
|
||
|
|
if (nhdr_ptr->n_namesz == 0)
|
||
|
|
break;
|
||
|
|
sz = sizeof(Elf32_Nhdr) +
|
||
|
|
((nhdr_ptr->n_namesz + 3) & ~3) +
|
||
|
|
((nhdr_ptr->n_descsz + 3) & ~3);
|
||
|
|
real_sz += sz;
|
||
|
|
nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Add this contiguous chunk of notes section to vmcore list.*/
|
||
|
|
new = get_new_element();
|
||
|
|
if (!new) {
|
||
|
|
kfree(notes_section);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
new->paddr = phdr_ptr->p_offset;
|
||
|
|
new->size = real_sz;
|
||
|
|
list_add_tail(&new->list, vc_list);
|
||
|
|
phdr_sz += real_sz;
|
||
|
|
kfree(notes_section);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Prepare merged PT_NOTE program header. */
|
||
|
|
phdr.p_type = PT_NOTE;
|
||
|
|
phdr.p_flags = 0;
|
||
|
|
note_off = sizeof(Elf32_Ehdr) +
|
||
|
|
(ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr);
|
||
|
|
phdr.p_offset = note_off;
|
||
|
|
phdr.p_vaddr = phdr.p_paddr = 0;
|
||
|
|
phdr.p_filesz = phdr.p_memsz = phdr_sz;
|
||
|
|
phdr.p_align = 0;
|
||
|
|
|
||
|
|
/* Add merged PT_NOTE program header*/
|
||
|
|
tmp = elfptr + sizeof(Elf32_Ehdr);
|
||
|
|
memcpy(tmp, &phdr, sizeof(phdr));
|
||
|
|
tmp += sizeof(phdr);
|
||
|
|
|
||
|
|
/* Remove unwanted PT_NOTE program headers. */
|
||
|
|
i = (nr_ptnote - 1) * sizeof(Elf32_Phdr);
|
||
|
|
*elfsz = *elfsz - i;
|
||
|
|
memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr)));
|
||
|
|
|
||
|
|
/* Modify e_phnum to reflect merged headers. */
|
||
|
|
ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Add memory chunks represented by program headers to vmcore list. Also update
|
||
|
|
* the new offset fields of exported program headers. */
|
||
|
|
static int __init process_ptload_program_headers_elf64(char *elfptr,
|
||
|
|
size_t elfsz,
|
||
|
|
struct list_head *vc_list)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
Elf64_Ehdr *ehdr_ptr;
|
||
|
|
Elf64_Phdr *phdr_ptr;
|
||
|
|
loff_t vmcore_off;
|
||
|
|
struct vmcore *new;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf64_Ehdr *)elfptr;
|
||
|
|
phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */
|
||
|
|
|
||
|
|
/* First program header is PT_NOTE header. */
|
||
|
|
vmcore_off = sizeof(Elf64_Ehdr) +
|
||
|
|
(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) +
|
||
|
|
phdr_ptr->p_memsz; /* Note sections */
|
||
|
|
|
||
|
|
for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
|
||
|
|
if (phdr_ptr->p_type != PT_LOAD)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* Add this contiguous chunk of memory to vmcore list.*/
|
||
|
|
new = get_new_element();
|
||
|
|
if (!new)
|
||
|
|
return -ENOMEM;
|
||
|
|
new->paddr = phdr_ptr->p_offset;
|
||
|
|
new->size = phdr_ptr->p_memsz;
|
||
|
|
list_add_tail(&new->list, vc_list);
|
||
|
|
|
||
|
|
/* Update the program header offset. */
|
||
|
|
phdr_ptr->p_offset = vmcore_off;
|
||
|
|
vmcore_off = vmcore_off + phdr_ptr->p_memsz;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init process_ptload_program_headers_elf32(char *elfptr,
|
||
|
|
size_t elfsz,
|
||
|
|
struct list_head *vc_list)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
Elf32_Ehdr *ehdr_ptr;
|
||
|
|
Elf32_Phdr *phdr_ptr;
|
||
|
|
loff_t vmcore_off;
|
||
|
|
struct vmcore *new;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf32_Ehdr *)elfptr;
|
||
|
|
phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */
|
||
|
|
|
||
|
|
/* First program header is PT_NOTE header. */
|
||
|
|
vmcore_off = sizeof(Elf32_Ehdr) +
|
||
|
|
(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) +
|
||
|
|
phdr_ptr->p_memsz; /* Note sections */
|
||
|
|
|
||
|
|
for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) {
|
||
|
|
if (phdr_ptr->p_type != PT_LOAD)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* Add this contiguous chunk of memory to vmcore list.*/
|
||
|
|
new = get_new_element();
|
||
|
|
if (!new)
|
||
|
|
return -ENOMEM;
|
||
|
|
new->paddr = phdr_ptr->p_offset;
|
||
|
|
new->size = phdr_ptr->p_memsz;
|
||
|
|
list_add_tail(&new->list, vc_list);
|
||
|
|
|
||
|
|
/* Update the program header offset */
|
||
|
|
phdr_ptr->p_offset = vmcore_off;
|
||
|
|
vmcore_off = vmcore_off + phdr_ptr->p_memsz;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Sets offset fields of vmcore elements. */
|
||
|
|
static void __init set_vmcore_list_offsets_elf64(char *elfptr,
|
||
|
|
struct list_head *vc_list)
|
||
|
|
{
|
||
|
|
loff_t vmcore_off;
|
||
|
|
Elf64_Ehdr *ehdr_ptr;
|
||
|
|
struct vmcore *m;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf64_Ehdr *)elfptr;
|
||
|
|
|
||
|
|
/* Skip Elf header and program headers. */
|
||
|
|
vmcore_off = sizeof(Elf64_Ehdr) +
|
||
|
|
(ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr);
|
||
|
|
|
||
|
|
list_for_each_entry(m, vc_list, list) {
|
||
|
|
m->offset = vmcore_off;
|
||
|
|
vmcore_off += m->size;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Sets offset fields of vmcore elements. */
|
||
|
|
static void __init set_vmcore_list_offsets_elf32(char *elfptr,
|
||
|
|
struct list_head *vc_list)
|
||
|
|
{
|
||
|
|
loff_t vmcore_off;
|
||
|
|
Elf32_Ehdr *ehdr_ptr;
|
||
|
|
struct vmcore *m;
|
||
|
|
|
||
|
|
ehdr_ptr = (Elf32_Ehdr *)elfptr;
|
||
|
|
|
||
|
|
/* Skip Elf header and program headers. */
|
||
|
|
vmcore_off = sizeof(Elf32_Ehdr) +
|
||
|
|
(ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr);
|
||
|
|
|
||
|
|
list_for_each_entry(m, vc_list, list) {
|
||
|
|
m->offset = vmcore_off;
|
||
|
|
vmcore_off += m->size;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init parse_crash_elf64_headers(void)
|
||
|
|
{
|
||
|
|
int rc=0;
|
||
|
|
Elf64_Ehdr ehdr;
|
||
|
|
u64 addr;
|
||
|
|
|
||
|
|
addr = elfcorehdr_addr;
|
||
|
|
|
||
|
|
/* Read Elf header */
|
||
|
|
rc = read_from_oldmem((char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0);
|
||
|
|
if (rc < 0)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
/* Do some basic Verification. */
|
||
|
|
if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
|
||
|
|
(ehdr.e_type != ET_CORE) ||
|
||
|
|
!vmcore_elf_check_arch(&ehdr) ||
|
||
|
|
ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
|
||
|
|
ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
|
||
|
|
ehdr.e_version != EV_CURRENT ||
|
||
|
|
ehdr.e_ehsize != sizeof(Elf64_Ehdr) ||
|
||
|
|
ehdr.e_phentsize != sizeof(Elf64_Phdr) ||
|
||
|
|
ehdr.e_phnum == 0) {
|
||
|
|
printk(KERN_WARNING "Warning: Core image elf header is not"
|
||
|
|
"sane\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Read in all elf headers. */
|
||
|
|
elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr);
|
||
|
|
elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
|
||
|
|
if (!elfcorebuf)
|
||
|
|
return -ENOMEM;
|
||
|
|
addr = elfcorehdr_addr;
|
||
|
|
rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
|
||
|
|
if (rc < 0) {
|
||
|
|
kfree(elfcorebuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Merge all PT_NOTE headers into one. */
|
||
|
|
rc = merge_note_headers_elf64(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
|
||
|
|
if (rc) {
|
||
|
|
kfree(elfcorebuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
rc = process_ptload_program_headers_elf64(elfcorebuf, elfcorebuf_sz,
|
||
|
|
&vmcore_list);
|
||
|
|
if (rc) {
|
||
|
|
kfree(elfcorebuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
set_vmcore_list_offsets_elf64(elfcorebuf, &vmcore_list);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init parse_crash_elf32_headers(void)
|
||
|
|
{
|
||
|
|
int rc=0;
|
||
|
|
Elf32_Ehdr ehdr;
|
||
|
|
u64 addr;
|
||
|
|
|
||
|
|
addr = elfcorehdr_addr;
|
||
|
|
|
||
|
|
/* Read Elf header */
|
||
|
|
rc = read_from_oldmem((char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0);
|
||
|
|
if (rc < 0)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
/* Do some basic Verification. */
|
||
|
|
if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
|
||
|
|
(ehdr.e_type != ET_CORE) ||
|
||
|
|
!elf_check_arch(&ehdr) ||
|
||
|
|
ehdr.e_ident[EI_CLASS] != ELFCLASS32||
|
||
|
|
ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
|
||
|
|
ehdr.e_version != EV_CURRENT ||
|
||
|
|
ehdr.e_ehsize != sizeof(Elf32_Ehdr) ||
|
||
|
|
ehdr.e_phentsize != sizeof(Elf32_Phdr) ||
|
||
|
|
ehdr.e_phnum == 0) {
|
||
|
|
printk(KERN_WARNING "Warning: Core image elf header is not"
|
||
|
|
"sane\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Read in all elf headers. */
|
||
|
|
elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr);
|
||
|
|
elfcorebuf = kmalloc(elfcorebuf_sz, GFP_KERNEL);
|
||
|
|
if (!elfcorebuf)
|
||
|
|
return -ENOMEM;
|
||
|
|
addr = elfcorehdr_addr;
|
||
|
|
rc = read_from_oldmem(elfcorebuf, elfcorebuf_sz, &addr, 0);
|
||
|
|
if (rc < 0) {
|
||
|
|
kfree(elfcorebuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Merge all PT_NOTE headers into one. */
|
||
|
|
rc = merge_note_headers_elf32(elfcorebuf, &elfcorebuf_sz, &vmcore_list);
|
||
|
|
if (rc) {
|
||
|
|
kfree(elfcorebuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
rc = process_ptload_program_headers_elf32(elfcorebuf, elfcorebuf_sz,
|
||
|
|
&vmcore_list);
|
||
|
|
if (rc) {
|
||
|
|
kfree(elfcorebuf);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
set_vmcore_list_offsets_elf32(elfcorebuf, &vmcore_list);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init parse_crash_elf_headers(void)
|
||
|
|
{
|
||
|
|
unsigned char e_ident[EI_NIDENT];
|
||
|
|
u64 addr;
|
||
|
|
int rc=0;
|
||
|
|
|
||
|
|
addr = elfcorehdr_addr;
|
||
|
|
rc = read_from_oldmem(e_ident, EI_NIDENT, &addr, 0);
|
||
|
|
if (rc < 0)
|
||
|
|
return rc;
|
||
|
|
if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) {
|
||
|
|
printk(KERN_WARNING "Warning: Core image elf header"
|
||
|
|
" not found\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (e_ident[EI_CLASS] == ELFCLASS64) {
|
||
|
|
rc = parse_crash_elf64_headers();
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
/* Determine vmcore size. */
|
||
|
|
vmcore_size = get_vmcore_size_elf64(elfcorebuf);
|
||
|
|
} else if (e_ident[EI_CLASS] == ELFCLASS32) {
|
||
|
|
rc = parse_crash_elf32_headers();
|
||
|
|
if (rc)
|
||
|
|
return rc;
|
||
|
|
|
||
|
|
/* Determine vmcore size. */
|
||
|
|
vmcore_size = get_vmcore_size_elf32(elfcorebuf);
|
||
|
|
} else {
|
||
|
|
printk(KERN_WARNING "Warning: Core image elf header is not"
|
||
|
|
" sane\n");
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Init function for vmcore module. */
|
||
|
|
static int __init vmcore_init(void)
|
||
|
|
{
|
||
|
|
int rc = 0;
|
||
|
|
|
||
|
|
/* If elfcorehdr= has been passed in cmdline, then capture the dump.*/
|
||
|
|
if (!(is_vmcore_usable()))
|
||
|
|
return rc;
|
||
|
|
rc = parse_crash_elf_headers();
|
||
|
|
if (rc) {
|
||
|
|
printk(KERN_WARNING "Kdump: vmcore not initialized\n");
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
|
||
|
|
if (proc_vmcore)
|
||
|
|
proc_vmcore->size = vmcore_size;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
module_init(vmcore_init)
|