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dad0bc1415
The value of fit_offset cannot possibly be greater than the length of the rom, since fit_ptr is restricted to be 32 bits. Check instead that the fit_ptr doesn't point outside the rom, or in other words that fit_offset isn't less than 0.
67 lines
1.4 KiB
Perl
Executable File
67 lines
1.4 KiB
Perl
Executable File
#!/usr/bin/perl
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use warnings;
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use strict;
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undef $/;
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my $rom = <>;
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my $base = 0xFFFFFFFF - length($rom) + 1;
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printf "ROM len: %08x\n", length($rom);
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printf "ROM base: %08x\n", $base;
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sub uint32
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{
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my $offset = shift;
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return unpack("V", substr($rom, $offset - $base, 4));
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}
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sub uint64
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{
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my $offset = shift;
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return unpack("Q", substr($rom, $offset - $base, 8));
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}
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# Assume the ROM is mapped to the top of 4GB
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my $fit_ptr = uint32(0xFFFFFFC0);
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my $fit_offset = $fit_ptr - $base;
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printf "FIT pointer: %08x (offset %08x)\n", $fit_ptr, $fit_offset;
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die "FIT pointer out of range?\n" if $fit_offset < 0;
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my $fit = substr($rom, $fit_ptr - $base, 8);
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printf "Signature: '%s'\n", $fit;
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die "Bad signature?\n" unless $fit eq '_FIT_ ';
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my $entries = uint32($fit_ptr + 0x8);
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my %entry_types = (
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0x00 => "Header",
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0x01 => "Microcode",
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0x02 => "Startup ACM",
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0x07 => "BIOS Startup Module",
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0x08 => "TPM Policy",
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0x09 => "BIOS Policy",
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0x0A => "TXT Policy",
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0x0B => "Key Manifest",
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0x0C => "Boot Policy Manifest",
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0x10 => "CSE Secure Boot",
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0x2D => "TXTSX Policy",
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0x2F => "JMP Debug Policy",
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0x7F => "SKIP",
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);
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for my $i (1..$entries-1)
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{
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my ($address, $len, $ver, $type, $csum) = unpack(
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"QVSCC", substr($rom, $fit_ptr - $base + $i*0x10, 0x10));
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printf "%d: address %08x @ %08x: ver %04x type %s (0x%02x)\n",
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$i,
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$address,
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$len,
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$ver,
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$entry_types{$type} || "Unknown",
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$type,
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;
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}
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