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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | #!/usr/bin/perl -w # use strict; use Math::BigInt; use Fcntl "SEEK_SET"; die "Format: $0 [-s <systemmap-file>] <vmlinux-file> <keyring-file>\n" if ($#ARGV != 1 && $#ARGV != 3 || $#ARGV == 3 && $ARGV[0] ne "-s"); my $sysmap = ""; if ($#ARGV == 3) { shift; $sysmap = $ARGV[0]; shift; } my $vmlinux = $ARGV[0]; my $keyring = $ARGV[1]; # # Parse the vmlinux section table # open FD, "objdump -h $vmlinux |" || die $vmlinux; my @lines = <FD>; close(FD) || die $vmlinux; my @sections = (); foreach my $line (@lines) { chomp($line); if ($line =~ /\s*([0-9]+)\s+(\S+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+2[*][*]([0-9]+)/ ) { my $seg = $1; my $name = $2; my $len = Math::BigInt->new("0x" . $3); my $vma = Math::BigInt->new("0x" . $4); my $lma = Math::BigInt->new("0x" . $5); my $foff = Math::BigInt->new("0x" . $6); my $align = 2 ** $7; push @sections, { name => $name, vma => $vma, len => $len, foff => $foff }; } } print "Have $#sections sections\n"; # # Try and parse the vmlinux symbol table. If the vmlinux file has been created # from a vmlinuz file with extract-vmlinux then the symbol table will be empty. # open FD, "nm $vmlinux 2>/dev/null |" || die $vmlinux; @lines = <FD>; close(FD) || die $vmlinux; my %symbols = (); my $nr_symbols = 0; sub parse_symbols(@) { foreach my $line (@_) { chomp($line); if ($line =~ /([0-9a-f]+)\s([a-zA-Z])\s(\S+)/ ) { my $addr = "0x" . $1; my $type = $2; my $name = $3; $symbols{$name} = $addr; $nr_symbols++; } } } parse_symbols(@lines); if ($nr_symbols == 0 && $sysmap ne "") { print "No symbols in vmlinux, trying $sysmap\n"; open FD, "<$sysmap" || die $sysmap; @lines = <FD>; close(FD) || die $sysmap; parse_symbols(@lines); } die "No symbols available\n" if ($nr_symbols == 0); print "Have $nr_symbols symbols\n"; die "Can't find system certificate list" unless (exists($symbols{"__cert_list_start"}) && exists($symbols{"__cert_list_end"})); my $start = Math::BigInt->new($symbols{"__cert_list_start"}); my $end = Math::BigInt->new($symbols{"__cert_list_end"}); my $size = $end - $start; printf "Have %u bytes of certs at VMA 0x%x\n", $size, $start; my $s = undef; foreach my $sec (@sections) { my $s_name = $sec->{name}; my $s_vma = $sec->{vma}; my $s_len = $sec->{len}; my $s_foff = $sec->{foff}; my $s_vend = $s_vma + $s_len; next unless ($start >= $s_vma); next if ($start >= $s_vend); die "Cert object partially overflows section $s_name\n" if ($end > $s_vend); die "Cert object in multiple sections: ", $s_name, " and ", $s->{name}, "\n" if ($s); $s = $sec; } die "Cert object not inside a section\n" unless ($s); print "Certificate list in section ", $s->{name}, "\n"; my $foff = $start - $s->{vma} + $s->{foff}; printf "Certificate list at file offset 0x%x\n", $foff; open FD, "<$vmlinux" || die $vmlinux; binmode(FD); die $vmlinux if (!defined(sysseek(FD, $foff, SEEK_SET))); my $buf = ""; my $len = sysread(FD, $buf, $size); die "$vmlinux" if (!defined($len)); die "Short read on $vmlinux\n" if ($len != $size); close(FD) || die $vmlinux; open FD, ">$keyring" || die $keyring; binmode(FD); $len = syswrite(FD, $buf, $size); die "$keyring" if (!defined($len)); die "Short write on $keyring\n" if ($len != $size); close(FD) || die $keyring; |