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kdump: use vmlinux_build_id to simplify 

We can use the vmlinux_build_id array here now instead of open coding it.
This mostly consolidates code.

Link: https://lkml.kernel.org/r/20210511003845.2429846-14-swboyd@chromium.org
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stephen Boyd 2021-07-07 18:09:49 -07:00 committed by Linus Torvalds
parent 3f14d029f9
commit 44e8a5e912
4 changed files with 10 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/buildid.h
View File

@ -10,7 +10,7 @@ int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id,
__u32 *size);
int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size);
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) || IS_ENABLED(CONFIG_CRASH_CORE)
extern unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX];
void init_vmlinux_build_id(void);
#else

12
include/linux/crash_core.h
View File

@ -38,8 +38,12 @@ phys_addr_t paddr_vmcoreinfo_note(void);
#define VMCOREINFO_OSRELEASE(value) \
vmcoreinfo_append_str("OSRELEASE=%s\n", value)
#define VMCOREINFO_BUILD_ID(value) \
vmcoreinfo_append_str("BUILD-ID=%s\n", value)
#define VMCOREINFO_BUILD_ID() \
({ \
static_assert(sizeof(vmlinux_build_id) == 20); \
vmcoreinfo_append_str("BUILD-ID=%20phN\n", vmlinux_build_id); \
})
#define VMCOREINFO_PAGESIZE(value) \
vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
#define VMCOREINFO_SYMBOL(name) \
@ -69,10 +73,6 @@ extern unsigned char *vmcoreinfo_data;
extern size_t vmcoreinfo_size;
extern u32 *vmcoreinfo_note;
/* raw contents of kernel .notes section */
extern const void __start_notes __weak;
extern const void __stop_notes __weak;
Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
void *data, size_t data_len);
void final_note(Elf_Word *buf);

50
kernel/crash_core.c
View File

@ -4,6 +4,7 @@
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
*/
#include <linux/buildid.h>
#include <linux/crash_core.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>
@ -378,53 +379,6 @@ phys_addr_t __weak paddr_vmcoreinfo_note(void)
}
EXPORT_SYMBOL(paddr_vmcoreinfo_note);
#define NOTES_SIZE (&__stop_notes - &__start_notes)
#define BUILD_ID_MAX SHA1_DIGEST_SIZE
#define NT_GNU_BUILD_ID 3
struct elf_note_section {
struct elf_note n_hdr;
u8 n_data[];
};
/*
* Add build ID from .notes section as generated by the GNU ld(1)
* or LLVM lld(1) --build-id option.
*/
static void add_build_id_vmcoreinfo(void)
{
char build_id[BUILD_ID_MAX * 2 + 1];
int n_remain = NOTES_SIZE;
while (n_remain >= sizeof(struct elf_note)) {
const struct elf_note_section *note_sec =
&__start_notes + NOTES_SIZE - n_remain;
const u32 n_namesz = note_sec->n_hdr.n_namesz;
if (note_sec->n_hdr.n_type == NT_GNU_BUILD_ID &&
n_namesz != 0 &&
!strcmp((char *)&note_sec->n_data[0], "GNU")) {
if (note_sec->n_hdr.n_descsz <= BUILD_ID_MAX) {
const u32 n_descsz = note_sec->n_hdr.n_descsz;
const u8 *s = &note_sec->n_data[n_namesz];
s = PTR_ALIGN(s, 4);
bin2hex(build_id, s, n_descsz);
build_id[2 * n_descsz] = '\0';
VMCOREINFO_BUILD_ID(build_id);
return;
}
pr_warn("Build ID is too large to include in vmcoreinfo: %u > %u\n",
note_sec->n_hdr.n_descsz,
BUILD_ID_MAX);
return;
}
n_remain -= sizeof(struct elf_note) +
ALIGN(note_sec->n_hdr.n_namesz, 4) +
ALIGN(note_sec->n_hdr.n_descsz, 4);
}
}
static int __init crash_save_vmcoreinfo_init(void)
{
vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
@ -443,7 +397,7 @@ static int __init crash_save_vmcoreinfo_init(void)
}
VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
add_build_id_vmcoreinfo();
VMCOREINFO_BUILD_ID();
VMCOREINFO_PAGESIZE(PAGE_SIZE);
VMCOREINFO_SYMBOL(init_uts_ns);

2
lib/buildid.c
View File

@ -174,7 +174,7 @@ int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size)
return parse_build_id_buf(build_id, NULL, buf, buf_size);
}
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) || IS_ENABLED(CONFIG_CRASH_CORE)
unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __ro_after_init;
/**