diff options
| -rw-r--r-- | include/linux/buildid.h | 3 | ||||
| -rw-r--r-- | init/main.c | 2 | ||||
| -rw-r--r-- | lib/buildid.c | 15 |
3 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/buildid.h b/include/linux/buildid.h index ebce93f26d06..f375900cf9ed 100644 --- a/include/linux/buildid.h +++ b/include/linux/buildid.h @@ -10,4 +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); +extern unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX]; +void init_vmlinux_build_id(void); + #endif diff --git a/init/main.c b/init/main.c index af521b30a3b8..f5b8246e8aa1 100644 --- a/init/main.c +++ b/init/main.c @@ -45,6 +45,7 @@ #include <linux/srcu.h> #include <linux/moduleparam.h> #include <linux/kallsyms.h> +#include <linux/buildid.h> #include <linux/writeback.h> #include <linux/cpu.h> #include <linux/cpuset.h> @@ -913,6 +914,7 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void) set_task_stack_end_magic(&init_task); smp_setup_processor_id(); debug_objects_early_init(); + init_vmlinux_build_id(); cgroup_init_early(); diff --git a/lib/buildid.c b/lib/buildid.c index 6aea1c4e5e85..1103ed46214f 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/buildid.h> +#include <linux/cache.h> #include <linux/elf.h> #include <linux/kernel.h> #include <linux/pagemap.h> @@ -172,3 +173,17 @@ 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); } + +unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __ro_after_init; + +/** + * init_vmlinux_build_id - Compute and stash the running kernel's build ID + */ +void __init init_vmlinux_build_id(void) +{ + extern const void __start_notes __weak; + extern const void __stop_notes __weak; + unsigned int size = &__stop_notes - &__start_notes; + + build_id_parse_buf(&__start_notes, vmlinux_build_id, size); +} |