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Improve Intel bruteforcing even more

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This commit is contained in:
RichardG867
2022-04-18 19:45:37 -03:00
parent 4d73d0ea13
commit 5512da2e2a
1 changed files with 20 additions and 1 deletions
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21
bios_extract/src/bios_extract.c
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@@ -286,6 +286,7 @@ int main(int argc, char *argv[])
Offset2 = 1;
for (Offset1 = 0; Offset1 < (FileLength - 10); Offset1 += 0x1000) {
BIOSOffset = Offset1;
i = 1;
retry: if (((fd = LH5Decode(BIOSImage + BIOSOffset, FileLength - BIOSOffset, IntelAMI, 13)) > -1) &&
(!memcmp(IntelAMI, "AMIBIOS(C)AMI", 13) || ((IntelAMI[0] == 0x55) && (IntelAMI[1] == 0xaa)))) {
if (Offset2 == 1) {
@@ -318,10 +319,28 @@ save: Buffer = MMapOutputFile((char *) IntelAMI, len);
}
munmap(Buffer, len);
} else if (!(BIOSOffset & 0xff)) {
/* There may be compressed data after the main body. (Advanced/EV VBIOS) */
if (fd > 0) {
if (fd & 1) /* padded to even byte */
fd++;
BIOSOffset += fd;
i = 1;
goto retry;
}
} else if (i) {
BIOSOffset += 0x44; /* skip "Copyright Notice: Copyright Intel..." */
i = 0;
goto retry;
} else if ((fd > -1) && !memcmp(BIOSImage + Offset1, "Copyright Notice: Copyright Intel", 33)) {
BIOSOffset = Offset1;
if (Offset2 == 1) {
printf("Found potential Intel AMIBIOS.\n");
InitRemainder(BIOSImage, FileLength);
Offset2 = 86; /* magic exit code if no main body found */
}
len = 65536;
sprintf((char *) IntelAMI, "intelunk_%05X.rom", BIOSOffset);
goto save;