/usr/share/perl5/Dpkg/Vendor/Debian.pm is in libdpkg-perl 1.18.4ubuntu1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 | # Copyright © 2009-2011 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2009, 2011-2015 Guillem Jover <guillem@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 <https://www.gnu.org/licenses/>.
package Dpkg::Vendor::Debian;
use strict;
use warnings;
our $VERSION = '0.01';
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Control::Types;
use Dpkg::BuildOptions;
use Dpkg::Arch qw(get_host_arch debarch_to_debtriplet);
use parent qw(Dpkg::Vendor::Default);
=encoding utf8
=head1 NAME
Dpkg::Vendor::Debian - Debian vendor object
=head1 DESCRIPTION
This vendor object customize the behaviour of dpkg scripts
for Debian specific actions.
=cut
sub run_hook {
my ($self, $hook, @params) = @_;
if ($hook eq 'keyrings') {
return ('/usr/share/keyrings/debian-keyring.gpg',
'/usr/share/keyrings/debian-maintainers.gpg');
} elsif ($hook eq 'builtin-build-depends') {
return qw(build-essential:native);
} elsif ($hook eq 'builtin-build-conflicts') {
return ();
} elsif ($hook eq 'register-custom-fields') {
} elsif ($hook eq 'extend-patch-header') {
my ($textref, $ch_info) = @params;
if ($ch_info->{'Closes'}) {
foreach my $bug (split(/\s+/, $ch_info->{'Closes'})) {
$$textref .= "Bug-Debian: https://bugs.debian.org/$bug\n";
}
}
# XXX: Layer violation...
require Dpkg::Vendor::Ubuntu;
my $b = Dpkg::Vendor::Ubuntu::find_launchpad_closes($ch_info->{'Changes'});
foreach my $bug (@$b) {
$$textref .= "Bug-Ubuntu: https://bugs.launchpad.net/bugs/$bug\n";
}
} elsif ($hook eq 'update-buildflags') {
$self->_add_qa_flags(@params);
$self->_add_reproducible_flags(@params);
$self->_add_sanitize_flags(@params);
$self->_add_hardening_flags(@params);
} else {
return $self->SUPER::run_hook($hook, @params);
}
}
sub _parse_build_options {
my ($self, $variable, $area, $use_feature) = @_;
# Adjust features based on user or maintainer's desires.
my $opts = Dpkg::BuildOptions->new(envvar => $variable);
foreach my $feature (split(/,/, $opts->get($area) // '')) {
$feature = lc($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 %s feature in %s variable: %s'),
$area, $variable, $feature);
}
}
} else {
warning(g_('incorrect value in %s option of %s variable: %s'),
$area, $variable, $feature);
}
}
}
sub _parse_feature_area {
my ($self, $area, $use_feature) = @_;
$self->_parse_build_options('DEB_BUILD_OPTIONS', $area, $use_feature);
$self->_parse_build_options('DEB_BUILD_MAINT_OPTIONS', $area, $use_feature);
}
sub _add_qa_flags {
my ($self, $flags) = @_;
# Default feature states.
my %use_feature = (
bug => 0,
canary => 0,
);
# Adjust features based on user or maintainer's desires.
$self->_parse_feature_area('qa', \%use_feature);
# Warnings that detect actual bugs.
if ($use_feature{bug}) {
foreach my $warnflag (qw(array-bounds clobbered volatile-register-var
implicit-function-declaration)) {
$flags->append('CFLAGS', "-Werror=$warnflag");
$flags->append('CXXFLAGS', "-Werror=$warnflag");
}
}
# Inject dummy canary options to detect issues with build flag propagation.
if ($use_feature{canary}) {
require Digest::MD5;
my $id = Digest::MD5::md5_hex(int rand 4096);
foreach my $flag (qw(CPPFLAGS CFLAGS OBJCFLAGS CXXFLAGS OBJCXXFLAGS)) {
$flags->append($flag, "-D__DEB_CANARY_${flag}_${id}__");
}
$flags->append('LDFLAGS', "-Wl,-z,deb-canary-${id}");
}
# Store the feature usage.
while (my ($feature, $enabled) = each %use_feature) {
$flags->set_feature('qa', $feature, $enabled);
}
}
sub _add_reproducible_flags {
my ($self, $flags) = @_;
# Default feature states.
my %use_feature = (
timeless => 1,
);
# Adjust features based on user or maintainer's desires.
$self->_parse_feature_area('reproducible', \%use_feature);
# Warn when the __TIME__, __DATE__ and __TIMESTAMP__ macros are used.
if ($use_feature{timeless}) {
$flags->append('CPPFLAGS', '-Wdate-time');
}
# Store the feature usage.
while (my ($feature, $enabled) = each %use_feature) {
$flags->set_feature('reproducible', $feature, $enabled);
}
}
sub _add_sanitize_flags {
my ($self, $flags) = @_;
# Default feature states.
my %use_feature = (
address => 0,
thread => 0,
leak => 0,
undefined => 0,
);
# Adjust features based on user or maintainer's desires.
$self->_parse_feature_area('sanitize', \%use_feature);
# Handle logical feature interactions.
if ($use_feature{address} and $use_feature{thread}) {
# Disable the thread sanitizer when the address one is active, they
# are mutually incompatible.
$use_feature{thread} = 0;
}
if ($use_feature{address} or $use_feature{thread}) {
# Disable leak sanitizer, it is implied by the address or thread ones.
$use_feature{leak} = 0;
}
if ($use_feature{address}) {
my $flag = '-fsanitize=address -fno-omit-frame-pointer';
$flags->append('CFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('LDFLAGS', '-fsanitize=address');
}
if ($use_feature{thread}) {
my $flag = '-fsanitize=thread';
$flags->append('CFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('LDFLAGS', $flag);
}
if ($use_feature{leak}) {
$flags->append('LDFLAGS', '-fsanitize=leak');
}
if ($use_feature{undefined}) {
my $flag = '-fsanitize=undefined';
$flags->append('CFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('LDFLAGS', $flag);
}
# Store the feature usage.
while (my ($feature, $enabled) = each %use_feature) {
$flags->set_feature('sanitize', $feature, $enabled);
}
}
sub _add_hardening_flags {
my ($self, $flags) = @_;
my $arch = get_host_arch();
my ($abi, $os, $cpu) = debarch_to_debtriplet($arch);
unless (defined $abi and defined $os and defined $cpu) {
warning(g_("unknown host architecture '%s'"), $arch);
($abi, $os, $cpu) = ('', '', '');
}
# Default feature states.
my %use_feature = (
pie => 0,
stackprotector => 1,
stackprotectorstrong => 1,
fortify => 1,
format => 1,
relro => 1,
bindnow => 0,
);
# Adjust features based on user or maintainer's desires.
$self->_parse_feature_area('hardening', \%use_feature);
# Mask features that are not available on certain architectures.
if ($os !~ /^(?:linux|knetbsd|hurd)$/ or
$cpu =~ /^(?:hppa|avr32)$/) {
# Disabled on non-linux/knetbsd/hurd (see #430455 and #586215).
# Disabled on hppa, avr32
# (#574716).
$use_feature{pie} = 0;
}
if ($cpu =~ /^(?:ia64|alpha|hppa)$/ or $arch eq 'arm') {
# Stack protector disabled on ia64, alpha, hppa.
# "warning: -fstack-protector not supported for this target"
# Stack protector disabled on arm (ok on armel).
# compiler supports it incorrectly (leads to SEGV)
$use_feature{stackprotector} = 0;
}
if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
# relro not implemented on ia64, hppa, avr32.
$use_feature{relro} = 0;
}
# Mask features that might be influenced by other flags.
if ($flags->{build_options}->has('noopt')) {
# glibc 2.16 and later warn when using -O0 and _FORTIFY_SOURCE.
$use_feature{fortify} = 0;
}
# Handle logical feature interactions.
if ($use_feature{relro} == 0) {
# Disable bindnow if relro is not enabled, since it has no
# hardening ability without relro and may incur load penalties.
$use_feature{bindnow} = 0;
}
if ($use_feature{stackprotector} == 0) {
# Disable stackprotectorstrong if stackprotector is disabled.
$use_feature{stackprotectorstrong} = 0;
}
# PIE
if ($use_feature{pie}) {
my $flag = '-fPIE';
$flags->append('CFLAGS', $flag);
$flags->append('OBJCFLAGS', $flag);
$flags->append('OBJCXXFLAGS', $flag);
$flags->append('FFLAGS', $flag);
$flags->append('FCFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('GCJFLAGS', $flag);
$flags->append('LDFLAGS', '-fPIE -pie');
}
# Stack protector
if ($use_feature{stackprotectorstrong}) {
my $flag = '-fstack-protector-strong';
$flags->append('CFLAGS', $flag);
$flags->append('OBJCFLAGS', $flag);
$flags->append('OBJCXXFLAGS', $flag);
$flags->append('FFLAGS', $flag);
$flags->append('FCFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('GCJFLAGS', $flag);
} elsif ($use_feature{stackprotector}) {
my $flag = '-fstack-protector --param=ssp-buffer-size=4';
$flags->append('CFLAGS', $flag);
$flags->append('OBJCFLAGS', $flag);
$flags->append('OBJCXXFLAGS', $flag);
$flags->append('FFLAGS', $flag);
$flags->append('FCFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('GCJFLAGS', $flag);
}
# Fortify Source
if ($use_feature{fortify}) {
$flags->append('CPPFLAGS', '-D_FORTIFY_SOURCE=2');
}
# Format Security
if ($use_feature{format}) {
my $flag = '-Wformat -Werror=format-security';
$flags->append('CFLAGS', $flag);
$flags->append('CXXFLAGS', $flag);
$flags->append('OBJCFLAGS', $flag);
$flags->append('OBJCXXFLAGS', $flag);
}
# Read-only Relocations
if ($use_feature{relro}) {
$flags->append('LDFLAGS', '-Wl,-z,relro');
}
# Bindnow
if ($use_feature{bindnow}) {
$flags->append('LDFLAGS', '-Wl,-z,now');
}
# Store the feature usage.
while (my ($feature, $enabled) = each %use_feature) {
$flags->set_feature('hardening', $feature, $enabled);
}
}
=head1 CHANGES
=head2 Version 0.xx
This is a private module.
=cut
1;
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