/usr/share/perl5/Dpkg/Vendor/Debian.pm is in libdpkg-perl 1.16.1.2ubuntu7.7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | # Copyright © 2009-2011 Raphaël Hertzog <hertzog@debian.org>
#
# Hardening build flags handling derived from work of:
# Copyright © 2009-2011 Kees Cook <kees@debian.org>
# Copyright © 2007-2008 Canonical, Ltd.
#
# 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, see <http://www.gnu.org/licenses/>.
package Dpkg::Vendor::Debian;
use strict;
use warnings;
our $VERSION = "0.01";
use base qw(Dpkg::Vendor::Default);
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Control::Types;
use Dpkg::Vendor::Ubuntu;
use Dpkg::BuildOptions;
use Dpkg::Arch qw(get_host_arch debarch_to_debtriplet);
=encoding utf8
=head1 NAME
Dpkg::Vendor::Debian - Debian vendor object
=head1 DESCRIPTION
This vendor object customize the behaviour of dpkg scripts
for Debian specific actions.
=cut
sub run_hook {
my ($self, $hook, @params) = @_;
if ($hook eq "keyrings") {
return ('/usr/share/keyrings/debian-keyring.gpg',
'/usr/share/keyrings/debian-maintainers.gpg');
} elsif ($hook eq "register-custom-fields") {
return (
[ "register", "Dm-Upload-Allowed",
CTRL_INFO_SRC | CTRL_INDEX_SRC | CTRL_PKG_SRC ],
[ "insert_after", CTRL_INDEX_SRC, "Uploaders", "Dm-Upload-Allowed" ],
[ "insert_after", CTRL_PKG_SRC, "Uploaders", "Dm-Upload-Allowed" ],
);
} elsif ($hook eq "extend-patch-header") {
my ($textref, $ch_info) = @params;
if ($ch_info->{'Closes'}) {
foreach my $bug (split(/\s+/, $ch_info->{'Closes'})) {
$$textref .= "Bug-Debian: http://bugs.debian.org/$bug\n";
}
}
my $b = Dpkg::Vendor::Ubuntu::find_launchpad_closes($ch_info->{'Changes'});
foreach my $bug (@$b) {
$$textref .= "Bug-Ubuntu: https://bugs.launchpad.net/bugs/$bug\n";
}
} elsif ($hook eq "update-buildflags") {
$self->add_hardening_flags(@params);
} else {
return $self->SUPER::run_hook($hook, @params);
}
}
sub add_hardening_flags {
my ($self, $flags) = @_;
my $arch = get_host_arch();
my ($abi, $os, $cpu) = debarch_to_debtriplet($arch);
# Decide what's enabled
my %use_feature = (
"pie" => 0,
"stackprotector" => 1,
"fortify" => 1,
"format" => 1,
"relro" => 1,
"bindnow" => 0
);
my $opts = Dpkg::BuildOptions->new(envvar => "DEB_BUILD_MAINT_OPTIONS");
foreach my $feature (split(",", $opts->get("hardening") // "")) {
$feature = lc($feature);
if ($feature =~ s/^([+-])//) {
my $value = ($1 eq "+") ? 1 : 0;
if ($feature eq "all") {
$use_feature{$_} = $value foreach keys %use_feature;
} else {
if (exists $use_feature{$feature}) {
$use_feature{$feature} = $value;
} else {
warning(_g("unknown hardening feature: %s"), $feature);
}
}
} else {
warning(_g("incorrect value in hardening option of " .
"DEB_BUILD_MAINT_OPTIONS: %s"), $feature);
}
}
# PIE
if ($use_feature{"pie"} and
$os =~ /^(linux|knetbsd|hurd)$/ and
$cpu !~ /^(hppa|m68k|mips|mipsel|avr32)$/) {
# Only on linux/knetbsd/hurd (see #430455 and #586215)
# Disabled on hppa, m68k (#451192), mips/mipsel (#532821), avr32
# (#574716)
$flags->append("CFLAGS", "-fPIE");
$flags->append("CXXFLAGS", "-fPIE");
$flags->append("LDFLAGS", "-fPIE -pie");
}
# Stack protector
if ($use_feature{"stackprotector"} and
$cpu !~ /^(ia64|alpha|mips|mipsel|hppa)$/ and $arch ne "arm") {
# Stack protector disabled on ia64, alpha, mips, mipsel, hppa.
# "warning: -fstack-protector not supported for this target"
# Stack protector disabled on arm (ok on armel).
# compiler supports it incorrectly (leads to SEGV)
$flags->append("CFLAGS", "-fstack-protector --param=ssp-buffer-size=4");
$flags->append("CXXFLAGS", "-fstack-protector --param=ssp-buffer-size=4");
}
# Fortify
if ($use_feature{"fortify"}) {
$flags->append("CPPFLAGS", "-D_FORTIFY_SOURCE=2");
}
# Format
if ($use_feature{"format"}) {
$flags->append("CFLAGS", "-Wformat -Wformat-security -Werror=format-security");
$flags->append("CXXFLAGS", "-Wformat -Wformat-security -Werror=format-security");
}
# Relro
if ($use_feature{"relro"} and $cpu !~ /^(ia64|hppa|avr32)$/) {
$flags->append("LDFLAGS", "-Wl,-z,relro");
} else {
# Disable full relro if relro is not enabled.
$use_feature{"bindnow"} = 0;
}
# Bindnow
if ($use_feature{"bindnow"}) {
$flags->append("LDFLAGS", "-Wl,-z,now");
}
}
1;
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