64e166099b
Commit cf8e865810 ("arch: Remove Itanium (IA-64) architecture")
removed the last use of the absolute kallsyms.
Signed-off-by: Jann Horn <jannh@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/all/20240221202655.2423854-1-jannh@google.com/
[masahiroy@kernel.org: rebase the code and reword the commit description]
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
229 lines
6.1 KiB
C
229 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* crash.c - kernel crash support code.
|
|
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
|
|
*/
|
|
|
|
#include <linux/buildid.h>
|
|
#include <linux/init.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/memory.h>
|
|
#include <linux/cpuhotplug.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/kmemleak.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/sections.h>
|
|
|
|
#include <crypto/sha1.h>
|
|
|
|
#include "kallsyms_internal.h"
|
|
#include "kexec_internal.h"
|
|
|
|
/* vmcoreinfo stuff */
|
|
unsigned char *vmcoreinfo_data;
|
|
size_t vmcoreinfo_size;
|
|
u32 *vmcoreinfo_note;
|
|
|
|
/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
|
|
static unsigned char *vmcoreinfo_data_safecopy;
|
|
|
|
Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
|
|
void *data, size_t data_len)
|
|
{
|
|
struct elf_note *note = (struct elf_note *)buf;
|
|
|
|
note->n_namesz = strlen(name) + 1;
|
|
note->n_descsz = data_len;
|
|
note->n_type = type;
|
|
buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
|
|
memcpy(buf, name, note->n_namesz);
|
|
buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
|
|
memcpy(buf, data, data_len);
|
|
buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
|
|
|
|
return buf;
|
|
}
|
|
|
|
void final_note(Elf_Word *buf)
|
|
{
|
|
memset(buf, 0, sizeof(struct elf_note));
|
|
}
|
|
|
|
static void update_vmcoreinfo_note(void)
|
|
{
|
|
u32 *buf = vmcoreinfo_note;
|
|
|
|
if (!vmcoreinfo_size)
|
|
return;
|
|
buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
|
|
vmcoreinfo_size);
|
|
final_note(buf);
|
|
}
|
|
|
|
void crash_update_vmcoreinfo_safecopy(void *ptr)
|
|
{
|
|
if (ptr)
|
|
memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
|
|
|
|
vmcoreinfo_data_safecopy = ptr;
|
|
}
|
|
|
|
void crash_save_vmcoreinfo(void)
|
|
{
|
|
if (!vmcoreinfo_note)
|
|
return;
|
|
|
|
/* Use the safe copy to generate vmcoreinfo note if have */
|
|
if (vmcoreinfo_data_safecopy)
|
|
vmcoreinfo_data = vmcoreinfo_data_safecopy;
|
|
|
|
vmcoreinfo_append_str("CRASHTIME=%lld\n", ktime_get_real_seconds());
|
|
update_vmcoreinfo_note();
|
|
}
|
|
|
|
void vmcoreinfo_append_str(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
char buf[0x50];
|
|
size_t r;
|
|
|
|
va_start(args, fmt);
|
|
r = vscnprintf(buf, sizeof(buf), fmt, args);
|
|
va_end(args);
|
|
|
|
r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
|
|
|
|
memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
|
|
|
|
vmcoreinfo_size += r;
|
|
|
|
WARN_ONCE(vmcoreinfo_size == VMCOREINFO_BYTES,
|
|
"vmcoreinfo data exceeds allocated size, truncating");
|
|
}
|
|
|
|
/*
|
|
* provide an empty default implementation here -- architecture
|
|
* code may override this
|
|
*/
|
|
void __weak arch_crash_save_vmcoreinfo(void)
|
|
{}
|
|
|
|
phys_addr_t __weak paddr_vmcoreinfo_note(void)
|
|
{
|
|
return __pa(vmcoreinfo_note);
|
|
}
|
|
EXPORT_SYMBOL(paddr_vmcoreinfo_note);
|
|
|
|
static int __init crash_save_vmcoreinfo_init(void)
|
|
{
|
|
vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!vmcoreinfo_data) {
|
|
pr_warn("Memory allocation for vmcoreinfo_data failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
|
|
GFP_KERNEL | __GFP_ZERO);
|
|
if (!vmcoreinfo_note) {
|
|
free_page((unsigned long)vmcoreinfo_data);
|
|
vmcoreinfo_data = NULL;
|
|
pr_warn("Memory allocation for vmcoreinfo_note failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
|
|
VMCOREINFO_BUILD_ID();
|
|
VMCOREINFO_PAGESIZE(PAGE_SIZE);
|
|
|
|
VMCOREINFO_SYMBOL(init_uts_ns);
|
|
VMCOREINFO_OFFSET(uts_namespace, name);
|
|
VMCOREINFO_SYMBOL(node_online_map);
|
|
#ifdef CONFIG_MMU
|
|
VMCOREINFO_SYMBOL_ARRAY(swapper_pg_dir);
|
|
#endif
|
|
VMCOREINFO_SYMBOL(_stext);
|
|
vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", (unsigned long) VMALLOC_START);
|
|
|
|
#ifndef CONFIG_NUMA
|
|
VMCOREINFO_SYMBOL(mem_map);
|
|
VMCOREINFO_SYMBOL(contig_page_data);
|
|
#endif
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
VMCOREINFO_SYMBOL_ARRAY(vmemmap);
|
|
#endif
|
|
#ifdef CONFIG_SPARSEMEM
|
|
VMCOREINFO_SYMBOL_ARRAY(mem_section);
|
|
VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
|
|
VMCOREINFO_STRUCT_SIZE(mem_section);
|
|
VMCOREINFO_OFFSET(mem_section, section_mem_map);
|
|
VMCOREINFO_NUMBER(SECTION_SIZE_BITS);
|
|
VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
|
|
#endif
|
|
VMCOREINFO_STRUCT_SIZE(page);
|
|
VMCOREINFO_STRUCT_SIZE(pglist_data);
|
|
VMCOREINFO_STRUCT_SIZE(zone);
|
|
VMCOREINFO_STRUCT_SIZE(free_area);
|
|
VMCOREINFO_STRUCT_SIZE(list_head);
|
|
VMCOREINFO_SIZE(nodemask_t);
|
|
VMCOREINFO_OFFSET(page, flags);
|
|
VMCOREINFO_OFFSET(page, _refcount);
|
|
VMCOREINFO_OFFSET(page, mapping);
|
|
VMCOREINFO_OFFSET(page, lru);
|
|
VMCOREINFO_OFFSET(page, _mapcount);
|
|
VMCOREINFO_OFFSET(page, private);
|
|
VMCOREINFO_OFFSET(page, compound_head);
|
|
VMCOREINFO_OFFSET(pglist_data, node_zones);
|
|
VMCOREINFO_OFFSET(pglist_data, nr_zones);
|
|
#ifdef CONFIG_FLATMEM
|
|
VMCOREINFO_OFFSET(pglist_data, node_mem_map);
|
|
#endif
|
|
VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
|
|
VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
|
|
VMCOREINFO_OFFSET(pglist_data, node_id);
|
|
VMCOREINFO_OFFSET(zone, free_area);
|
|
VMCOREINFO_OFFSET(zone, vm_stat);
|
|
VMCOREINFO_OFFSET(zone, spanned_pages);
|
|
VMCOREINFO_OFFSET(free_area, free_list);
|
|
VMCOREINFO_OFFSET(list_head, next);
|
|
VMCOREINFO_OFFSET(list_head, prev);
|
|
VMCOREINFO_LENGTH(zone.free_area, NR_PAGE_ORDERS);
|
|
log_buf_vmcoreinfo_setup();
|
|
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
|
|
VMCOREINFO_NUMBER(NR_FREE_PAGES);
|
|
VMCOREINFO_NUMBER(PG_lru);
|
|
VMCOREINFO_NUMBER(PG_private);
|
|
VMCOREINFO_NUMBER(PG_swapcache);
|
|
VMCOREINFO_NUMBER(PG_swapbacked);
|
|
#define PAGE_SLAB_MAPCOUNT_VALUE (~PG_slab)
|
|
VMCOREINFO_NUMBER(PAGE_SLAB_MAPCOUNT_VALUE);
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
VMCOREINFO_NUMBER(PG_hwpoison);
|
|
#endif
|
|
VMCOREINFO_NUMBER(PG_head_mask);
|
|
#define PAGE_BUDDY_MAPCOUNT_VALUE (~PG_buddy)
|
|
VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
|
|
#define PAGE_HUGETLB_MAPCOUNT_VALUE (~PG_hugetlb)
|
|
VMCOREINFO_NUMBER(PAGE_HUGETLB_MAPCOUNT_VALUE);
|
|
#define PAGE_OFFLINE_MAPCOUNT_VALUE (~PG_offline)
|
|
VMCOREINFO_NUMBER(PAGE_OFFLINE_MAPCOUNT_VALUE);
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
VMCOREINFO_SYMBOL(kallsyms_names);
|
|
VMCOREINFO_SYMBOL(kallsyms_num_syms);
|
|
VMCOREINFO_SYMBOL(kallsyms_token_table);
|
|
VMCOREINFO_SYMBOL(kallsyms_token_index);
|
|
VMCOREINFO_SYMBOL(kallsyms_offsets);
|
|
VMCOREINFO_SYMBOL(kallsyms_relative_base);
|
|
#endif /* CONFIG_KALLSYMS */
|
|
|
|
arch_crash_save_vmcoreinfo();
|
|
update_vmcoreinfo_note();
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(crash_save_vmcoreinfo_init);
|