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# pe -- lintian check script -*- perl -*-
# Copyright (C) 2017 Chris Lamb <lamby@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, you can find it on the World Wide
# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
package Lintian::pe;
use strict;
use warnings;
use autodie;
use List::MoreUtils qw(any);
use Lintian::Tags qw(tag);
use Lintian::Util qw(internal_error);
sub run {
my (undef, undef, $info) = @_;
foreach my $file ($info->sorted_index) {
next unless $file->is_file;
next unless $file->file_info =~ /^PE32\+? executable/;
next unless $file->is_open_ok;
my $buf;
my $fd = $file->open;
eval {
# Offset to main header
seek($fd, 0x3c, 0) or internal_error("seek: $!");
read($fd, $buf, 4) or internal_error("read: $!");
my $pe_offset = unpack('V', $buf);
# Read magic to determine whether we are are PE32 or PE32+
seek($fd, $pe_offset + 26 + 64, 0) or internal_error("seek: $!");
# Read and parse DLLCharacteristics value
read($fd, $buf, 2) or internal_error("read: $!");
};
my $characteristics = unpack('v', $buf);
my %features = (
'ASLR' => $characteristics & 0x40,
'DEP/NX' => $characteristics & 0x100,
'SEH' => ~$characteristics & 0x400,
);
tag 'portable-executable-missing-security-features', $file
unless any { $_ == 0 } values %features;
close($fd);
}
return;
}
1;
# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et
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