diff options
Diffstat (limited to 'utils/readelf.c')
| -rw-r--r-- | utils/readelf.c | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/utils/readelf.c b/utils/readelf.c index 2af4b5ca9..60f14a6bf 100644 --- a/utils/readelf.c +++ b/utils/readelf.c @@ -93,36 +93,33 @@ static void * elf_find_dynamic( int64_t const key, ElfW(Dyn) *dynp, static int check_elf_header(ElfW(Ehdr) *const ehdr) { - if (! ehdr || strncmp((void *)ehdr, ELFMAG, SELFMAG) != 0 || - (ehdr->e_ident[EI_CLASS] != ELFCLASS32 && - ehdr->e_ident[EI_CLASS] != ELFCLASS64) || - ehdr->e_ident[EI_VERSION] != EV_CURRENT) - { + if (!ehdr || *(uint32_t*)ehdr != ELFMAG_U32 + || (ehdr->e_ident[EI_CLASS] != ELFCLASS32 + && ehdr->e_ident[EI_CLASS] != ELFCLASS64) + || ehdr->e_ident[EI_VERSION] != EV_CURRENT + ) { return 1; } /* Check if the target endianness matches the host's endianness */ byteswap = 0; #if __BYTE_ORDER == __LITTLE_ENDIAN - if (ehdr->e_ident[5] == ELFDATA2MSB) { - /* Ick -- we will have to byte-swap everything */ + if (ehdr->e_ident[5] == ELFDATA2MSB) byteswap = 1; - } #elif __BYTE_ORDER == __BIG_ENDIAN - if (ehdr->e_ident[5] == ELFDATA2LSB) { + if (ehdr->e_ident[5] == ELFDATA2LSB) byteswap = 1; - } #else #error Unknown host byte order! #endif - /* Be vary lazy, and only byteswap the stuff we use */ - if (byteswap==1) { - ehdr->e_type=bswap_16(ehdr->e_type); - ehdr->e_machine=bswap_16(ehdr->e_machine); - ehdr->e_phoff=byteswap_to_host(ehdr->e_phoff); - ehdr->e_shoff=byteswap_to_host(ehdr->e_shoff); - ehdr->e_phnum=bswap_16(ehdr->e_phnum); - ehdr->e_shnum=bswap_16(ehdr->e_shnum); + /* Be very lazy, and only byteswap the stuff we use */ + if (byteswap) { + ehdr->e_type = bswap_16(ehdr->e_type); + ehdr->e_machine = bswap_16(ehdr->e_machine); + ehdr->e_phoff = byteswap_to_host(ehdr->e_phoff); + ehdr->e_shoff = byteswap_to_host(ehdr->e_shoff); + ehdr->e_phnum = bswap_16(ehdr->e_phnum); + ehdr->e_shnum = bswap_16(ehdr->e_shnum); } return 0; } |