diff options
Diffstat (limited to 'lib/buildid.c')
| -rw-r--r-- | lib/buildid.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/lib/buildid.c b/lib/buildid.c index 4a4f520c0e29..6156997c3895 100644 --- a/lib/buildid.c +++ b/lib/buildid.c @@ -12,6 +12,7 @@ */ static inline int parse_build_id(void *page_addr, unsigned char *build_id, + __u32 *size, void *note_start, Elf32_Word note_size) { @@ -38,6 +39,8 @@ static inline int parse_build_id(void *page_addr, nhdr->n_descsz); memset(build_id + nhdr->n_descsz, 0, BUILD_ID_SIZE_MAX - nhdr->n_descsz); + if (size) + *size = nhdr->n_descsz; return 0; } new_offs = note_offs + sizeof(Elf32_Nhdr) + @@ -50,7 +53,8 @@ static inline int parse_build_id(void *page_addr, } /* Parse build ID from 32-bit ELF */ -static int get_build_id_32(void *page_addr, unsigned char *build_id) +static int get_build_id_32(void *page_addr, unsigned char *build_id, + __u32 *size) { Elf32_Ehdr *ehdr = (Elf32_Ehdr *)page_addr; Elf32_Phdr *phdr; @@ -65,7 +69,7 @@ static int get_build_id_32(void *page_addr, unsigned char *build_id) for (i = 0; i < ehdr->e_phnum; ++i) { if (phdr[i].p_type == PT_NOTE && - !parse_build_id(page_addr, build_id, + !parse_build_id(page_addr, build_id, size, page_addr + phdr[i].p_offset, phdr[i].p_filesz)) return 0; @@ -74,7 +78,8 @@ static int get_build_id_32(void *page_addr, unsigned char *build_id) } /* Parse build ID from 64-bit ELF */ -static int get_build_id_64(void *page_addr, unsigned char *build_id) +static int get_build_id_64(void *page_addr, unsigned char *build_id, + __u32 *size) { Elf64_Ehdr *ehdr = (Elf64_Ehdr *)page_addr; Elf64_Phdr *phdr; @@ -89,7 +94,7 @@ static int get_build_id_64(void *page_addr, unsigned char *build_id) for (i = 0; i < ehdr->e_phnum; ++i) { if (phdr[i].p_type == PT_NOTE && - !parse_build_id(page_addr, build_id, + !parse_build_id(page_addr, build_id, size, page_addr + phdr[i].p_offset, phdr[i].p_filesz)) return 0; @@ -97,8 +102,16 @@ static int get_build_id_64(void *page_addr, unsigned char *build_id) return -EINVAL; } -/* Parse build ID of ELF file mapped to vma */ -int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id) +/* + * Parse build ID of ELF file mapped to vma + * @vma: vma object + * @build_id: buffer to store build id, at least BUILD_ID_SIZE long + * @size: returns actual build id size in case of success + * + * Returns 0 on success, otherwise error (< 0). + */ +int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id, + __u32 *size) { Elf32_Ehdr *ehdr; struct page *page; @@ -126,9 +139,9 @@ int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id) goto out; if (ehdr->e_ident[EI_CLASS] == ELFCLASS32) - ret = get_build_id_32(page_addr, build_id); + ret = get_build_id_32(page_addr, build_id, size); else if (ehdr->e_ident[EI_CLASS] == ELFCLASS64) - ret = get_build_id_64(page_addr, build_id); + ret = get_build_id_64(page_addr, build_id, size); out: kunmap_atomic(page_addr); put_page(page); |