Add an API that can parse the build ID in hex string form out of a buffer to support printing a kernel module's build ID.
Cc: Jiri Olsa <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Jessica Yu <[email protected]> Cc: Evan Green <[email protected]> Cc: Hsin-Yi Wang <[email protected]> Signed-off-by: Stephen Boyd <[email protected]> --- include/linux/buildid.h | 1 + lib/buildid.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/buildid.h b/include/linux/buildid.h index dd134a96a87c..f5a5b920d18c 100644 --- a/include/linux/buildid.h +++ b/include/linux/buildid.h @@ -10,6 +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, char *build_id, u32 buf_size); const char *vmlinux_build_id(void); #endif diff --git a/lib/buildid.c b/lib/buildid.c index 57daf928b133..4e1d7c51dc5f 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -165,6 +165,26 @@ static void build_id2hex(char *dst, const unsigned char *src, __u32 size) dst[2 * size] = '\0'; } +/** + * build_id_parse_buf - Get build ID in hex string format from elf section note + * @buf: Elf note section(s) to parse + * @build_id: Build ID in hex string format parsed from @buf + * @buf_size: Size of @buf in bytes + * + * Return: 0 on success, -EINVAL otherwise + */ +int build_id_parse_buf(const void *buf, char *build_id, u32 buf_size) +{ + unsigned char build_id_buf[BUILD_ID_SIZE_MAX]; + __u32 size; + int ret; + + ret = parse_build_id_buf(build_id_buf, &size, buf, buf_size); + if (!ret) + build_id2hex(build_id, build_id_buf, size); + + return ret; +} /** * vmlinux_build_id - Get the running kernel's build-id in hex string format * -- https://chromeos.dev
