diff options
Diffstat (limited to 'elf/dl-load.c')
| -rw-r--r-- | elf/dl-load.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c index 1220183ce2..10d859bd35 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -1683,6 +1683,18 @@ open_verify (const char *name, int fd, if (ph->p_type == PT_NOTE && ph->p_filesz >= 32 && ph->p_align >= 4) { ElfW(Addr) size = ph->p_filesz; + /* NB: Some PT_NOTE segment may have alignment value of 0 + or 1. gABI specifies that PT_NOTE segments should be + aligned to 4 bytes in 32-bit objects and to 8 bytes in + 64-bit objects. As a Linux extension, we also support + 4 byte alignment in 64-bit objects. If p_align is less + than 4, we treate alignment as 4 bytes since some note + segments have 0 or 1 byte alignment. */ + ElfW(Addr) align = ph->p_align; + if (align < 4) + align = 4; + else if (align != 4 && align != 8) + continue; if (ph->p_offset + size <= (size_t) fbp->len) abi_note = (void *) (fbp->buf + ph->p_offset); @@ -1696,10 +1708,9 @@ open_verify (const char *name, int fd, while (memcmp (abi_note, &expected_note, sizeof (expected_note))) { -#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word))) - ElfW(Addr) note_size = 3 * sizeof (ElfW(Word)) - + ROUND (abi_note[0]) - + ROUND (abi_note[1]); + ElfW(Addr) note_size + = ELF_NOTE_NEXT_OFFSET (abi_note[0], abi_note[1], + align); if (size - 32 < note_size) { |