diff options
Diffstat (limited to 'src/vendorcode/google/chromeos/fmap.c')
| -rw-r--r-- | src/vendorcode/google/chromeos/fmap.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/vendorcode/google/chromeos/fmap.c b/src/vendorcode/google/chromeos/fmap.c index 50b0248783..21d439e07d 100644 --- a/src/vendorcode/google/chromeos/fmap.c +++ b/src/vendorcode/google/chromeos/fmap.c @@ -26,10 +26,15 @@ static int is_fmap_signature_valid(const struct fmap *fmap) { - if (memcmp(fmap, FMAP_SIGNATURE, sizeof(FMAP_SIGNATURE) - 1)) { - printk(BIOS_ERR, "No FMAP found at %p.\n", fmap); - return 1; - } + const char reversed_sig[] = FMAP_REVERSED_SIGNATURE; + const char *p2 = reversed_sig + sizeof(FMAP_REVERSED_SIGNATURE) - 2; + const char *p1 = (char *)fmap; + + while (p2 >= reversed_sig) + if (*p1++ != *p2--) { + printk(BIOS_ERR, "No FMAP found at %p.\n", fmap); + return 1; + } printk(BIOS_DEBUG, "FMAP: Found \"%s\" version %d.%d at %p.\n", fmap->name, fmap->ver_major, fmap->ver_minor, fmap); |