3 # Build log hardening check, checks build logs for missing hardening flags.
5 # Copyright (C) 2012-2018 Simon Ruderich
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
25 use Text::ParseWords ();
27 our $VERSION = '0.08';
32 # Regex to catch compiler commands.
34 (?<!\s-) # ignore options, e.g. "-c++" [sic!] (used by swig)
35 (?<!\.) # ignore file names, e.g. "test.gcc"
36 (?:cc|gcc|g\+\+|c\+\+|gfortran|mpicc|mpicxx|mpifort)
37 (?:-[\d.]+)? # version suffix, e.g. "gcc-4.6"
39 # Full regex which matches the complete compiler name. Used in a few places to
40 # prevent false negatives.
41 my $cc_regex_full_prefix = qr/
42 [a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?
44 my $cc_regex_full = qr/
45 (?:$cc_regex_full_prefix-)?
48 # Regex to check if a line contains a compiler command.
49 my $cc_regex_normal = qr/
52 # Regex to catch (GCC) compiler warnings.
53 my $warning_regex = qr/^(.+?):(\d+):\d+: warning: (.+?) \[(.+?)\]$/;
54 # Regex to catch libtool commands and not lines which show commands executed
55 # by libtool (e.g. libtool: link: ...).
56 my $libtool_regex = qr/\blibtool\s.*--mode=/;
57 my $libtool_link_regex = qr/\blibtool: link: /;
59 # List of source file extensions which require preprocessing.
60 my @source_preprocess_compile_cpp = (
62 qw( cc cp cxx cpp CPP c++ C ),
66 my @source_preprocess_compile_fortran = (
68 qw( F FOR fpp FPP FTN F90 F95 F03 F08 ),
70 my @source_preprocess_compile = (
76 @source_preprocess_compile_cpp,
78 @source_preprocess_compile_fortran,
80 my @source_preprocess_no_compile = (
84 my @source_preprocess = (
85 @source_preprocess_compile,
86 @source_preprocess_no_compile,
88 # List of source file extensions which don't require preprocessing.
89 my @source_no_preprocess_compile_cpp = (
95 my @source_no_preprocess_compile_ada = (
101 my @source_no_preprocess_compile_fortran = (
103 qw( f for ftn f90 f95 f03 f08 ),
105 my @source_no_preprocess_compile = (
109 @source_no_preprocess_compile_cpp,
113 @source_no_preprocess_compile_fortran,
115 @source_no_preprocess_compile_ada,
117 my @source_no_preprocess_no_compile_ada = (
121 my @source_no_preprocess_no_compile = (
125 @source_no_preprocess_no_compile_ada,
127 my @source_no_preprocess = (
128 @source_no_preprocess_compile,
129 @source_no_preprocess_no_compile,
131 # List of header file extensions which require preprocessing.
132 my @header_preprocess = (
133 # C, C++, Objective-C, Objective-C++
136 qw( hh H hp hxx hpp HPP h++ tcc ),
140 # Normal object files.
142 # Libtool object files.
144 # Dynamic libraries. bzip2 uses .sho.
150 # Hashes for fast extensions lookup to check if a file falls in one of these
152 my %extensions_no_preprocess = map { $_ => 1 } (
153 # There's no @header_no_preprocess.
154 @source_no_preprocess,
156 my %extensions_preprocess = map { $_ => 1 } (
160 my %extensions_compile_link = map { $_ => 1 } (
162 @source_no_preprocess,
164 my %extensions_compile = map { $_ => 1 } (
165 @source_preprocess_compile,
166 @source_no_preprocess_compile,
168 my %extensions_no_compile = map { $_ => 1 } (
169 @source_preprocess_no_compile,
170 @source_no_preprocess_no_compile,
172 my %extensions_compile_cpp = map { $_ => 1 } (
173 @source_preprocess_compile_cpp,
174 @source_no_preprocess_compile_cpp,
176 my %extensions_ada = map { $_ => 1 } (
177 @source_no_preprocess_compile_ada,
178 @source_no_preprocess_no_compile_ada,
180 my %extensions_fortran = map { $_ => 1 } (
181 @source_no_preprocess_compile_fortran,
182 @source_preprocess_compile_fortran,
184 my %extensions_object = map { $_ => 1 } (
187 my %extension = map { $_ => 1 } (
188 @source_no_preprocess,
194 # Regexp to match file extensions.
195 my $file_extension_regex = qr/
197 \S+ # Filename without extension.
199 ([^\/\\.,;:\s]+)# File extension.
200 (?=\s|\\) # At end of word. Can't use \b because some files have non
201 # word characters at the end and because \b matches double
202 # extensions (like .cpp.o). Works always as all lines are
203 # terminated with "\n".
206 # Expected (hardening) flags. All flags are used as regexps (and compiled to
207 # real regexps below for better execution speed).
210 '-O(?:2|3)', # keep at index 1, search for @def_cflags_debug to change it
212 my @def_cflags_debug = (
213 # These flags indicate a debug build which disables checks for -O2.
217 my @def_cflags_format = (
218 '-Wformat(?:=2)?', # -Wformat=2 implies -Wformat, accept it too
219 '-Werror=format-security', # implies -Wformat-security
221 my @def_cflags_fortify = (
222 # fortify needs at least -O1, but -O2 is recommended anyway
224 my @def_cflags_stack = (
226 '--param[= ]ssp-buffer-size=4',
228 my @def_cflags_stack_strong = (
229 '-fstack-protector-strong',
231 my @def_cflags_pie = (
237 # @def_cxxflags_* is the same as @def_cflags_*.
238 my @def_cppflags = ();
239 my @def_cppflags_fortify = (
240 '-D_FORTIFY_SOURCE=2', # must be first, see cppflags_fortify_broken()
241 # If you add another flag fix hack below (search for "Hack to fix") and
242 # $def_cppflags_fortify[0].
244 my @def_cppflags_fortify_bad = (
245 # These flags may overwrite -D_FORTIFY_SOURCE=2.
247 '-D_FORTIFY_SOURCE=0',
248 '-D_FORTIFY_SOURCE=1',
250 my @def_ldflags = ();
251 my @def_ldflags_relro = (
254 my @def_ldflags_bindnow = (
257 my @def_ldflags_pie = (
261 my @def_ldflags_pic = (
266 # References to all flags checked by the flag checker.
270 \@def_cflags_fortify,
272 \@def_cflags_stack_strong,
276 \@def_cppflags_fortify,
279 \@def_ldflags_bindnow,
282 # References to all used flags.
283 my @flag_refs_all = (
286 \@def_cppflags_fortify_bad,
289 # Renaming rules for the output so the regex parts are not visible. Also
290 # stores string values of flag regexps above, see compile_flag_regexp().
292 '-O(?:2|3)' => '-O2',
293 '-Wformat(?:=2)?' => '-Wformat',
294 '--param[= ]ssp-buffer-size=4' => '--param=ssp-buffer-size=4',
295 '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
296 '-Wl,(?:-z,)?now' => '-Wl,-z,now',
300 no_compiler_commands => 1 << 0,
301 # used by POD::Usage => 1 << 1,
302 non_verbose_build => 1 << 2,
303 flags_missing => 1 << 3,
304 hardening_wrapper => 1 << 4,
305 invalid_cmake => 1 << 5,
309 no_compiler_commands => 'I-no-compiler-commands',
310 non_verbose_build => 'W-compiler-flags-hidden',
311 flags_missing => 'W-dpkg-buildflags-missing',
312 hardening_wrapper => 'I-hardening-wrapper-used',
313 invalid_cmake => 'I-invalid-cmake-used',
316 # Statistics of missing flags and non-verbose build commands. Used for
320 preprocess_missing => 0,
322 compile_missing => 0,
324 compile_cpp_missing => 0,
328 commands_nonverbose => 0,
331 # Use colored (ANSI) output?
337 # Only works for single-level arrays with no undef values. Thanks to perlfaq4.
339 my ($first_ref, $second_ref) = @_;
341 return 0 if scalar @{$first_ref} != scalar @{$second_ref};
343 my $length = scalar @{$first_ref};
344 for (my $i = 0; $i < $length; $i++) {
345 return 0 if $first_ref->[$i] ne $second_ref->[$i];
352 my ($message, $missing_flags_ref, $flag_renames_ref, $line, $number) = @_;
354 # Get string value of qr//-escaped regexps and if requested rename them.
355 my @missing_flags = map {
356 $flag_renames_ref->{$_}
357 } @{$missing_flags_ref};
359 my $flags = join ' ', @missing_flags;
360 printf '%d:', $number if defined $number;
361 printf '%s (%s)%s %s',
362 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
367 sub error_non_verbose_build {
368 my ($line, $number) = @_;
370 printf '%d:', $number if defined $number;
372 error_color('NONVERBOSE BUILD', 'red'),
373 error_color(':', 'yellow'),
378 sub error_invalid_cmake {
382 error_color('INVALID CMAKE', 'red'),
383 error_color(':', 'yellow'),
388 sub error_hardening_wrapper {
390 error_color('HARDENING WRAPPER', 'red'),
391 error_color(':', 'yellow'),
392 'no checks possible, aborting';
397 my ($message, $color) = @_;
400 return Term::ANSIColor::colored($message, $color);
407 my ($line, @flags) = @_;
409 foreach my $flag (@flags) {
410 return 1 if $line =~ /$flag/;
416 my ($line, $missing_flags_ref, @flags) = @_;
418 my @missing_flags = ();
419 foreach my $flag (@flags) {
420 if (not $line =~ /$flag/) {
421 push @missing_flags, $flag;
425 return 1 if scalar @missing_flags == 0;
427 @{$missing_flags_ref} = @missing_flags;
431 sub cppflags_fortify_broken {
432 my ($line, $missing_flags) = @_;
434 # This doesn't take the position into account, but is a simple solution.
435 # And if the build system tries to force -D_FORTIFY_SOURCE=0/1, something
438 if (any_flags_used($line, @def_cppflags_fortify_bad)) {
439 # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
440 push @{$missing_flags}, $def_cppflags_fortify[0];
447 # Modifies $missing_flags_ref array.
448 sub pic_pie_conflict {
449 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
451 return 0 if not $pie;
452 return 0 if not any_flags_used($line, @def_ldflags_pic);
454 my %flags = map { $_ => 1 } @flags_pie;
456 # Remove all PIE flags from @missing_flags as they are not required with
459 not exists $flags{$_}
460 } @{$missing_flags_ref};
461 @{$missing_flags_ref} = @result;
463 # We got a conflict when no flags are left, thus only PIE flags were
464 # missing. If other flags were missing abort because the conflict is not
466 return scalar @result == 0;
469 sub is_non_verbose_build {
470 my ($line, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
472 if ($line =~ /$libtool_regex/o) {
473 # libtool's --silent hides the real compiler flags.
474 if ($line =~ /\s--silent/) {
476 # If --silent is not present, skip this line as some compiler flags
477 # might be missing (e.g. -fPIE) which are handled correctly by libtool
478 # internally. libtool displays the real compiler command on the next
479 # line, so the flags are checked as usual.
486 if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
487 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
488 or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
489 or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
490 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
496 # C++ compiler setting.
497 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
498 return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
499 # "Compiling" non binary files.
500 return 0 if $line =~ /^\s*Compiling \S+\.(?:py|el)['"]?\s*(?:\.\.\.)?$/;
501 # "Compiling" with no file name.
502 if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
503 # $file_extension_regex may need spaces around the filename.
504 return 0 if not " $1 " =~ /$file_extension_regex/o;
509 # On the first pass we only check if this line is verbose or not.
510 return 1 if not defined $input_ref;
512 # Second pass, we have access to the next lines.
515 # CMake and other build systems print the non-verbose messages also when
516 # building verbose. If a compiler and the file name occurs in the next
517 # lines, treat it as verbose build.
519 # Get filename, we can't use the complete path as only parts of it are
520 # used in the real compiler command.
521 $file =~ m{/([^/\s]+)$};
524 for (my $i = 1; $i <= $line_count; $i++) {
525 my $next_line = $input_ref->[$line_offset + $i];
526 last unless defined $next_line;
528 if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
529 # Not a non-verbose line, but we still have to skip the
530 # current line as it doesn't contain any compiler commands.
540 # Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
542 my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
544 my %removes = map { $_ => 1 } @flags;
545 foreach my $flags (@{$flag_refs_ref}) {
547 # Flag found as string.
548 not exists $removes{$_}
549 # Flag found as string representation of regexp.
550 and (not defined $flag_renames_ref->{$_}
551 or not exists $removes{$flag_renames_ref->{$_}})
558 # Modifies $flag_renames_ref hash.
559 sub compile_flag_regexp {
560 my ($flag_renames_ref, @flags) = @_;
563 foreach my $flag (@flags) {
564 # Compile flag regexp for faster execution.
565 my $regex = qr/\s$flag(?:\s|\\)/;
567 # Store flag name in replacement string for correct flags in messages
568 # with qr//ed flag regexps.
569 $flag_renames_ref->{$regex}
570 = (exists $flag_renames_ref->{$flag})
571 ? $flag_renames_ref->{$flag}
574 push @result, $regex;
579 # Does any extension in @extensions exist in %{$extensions_ref}?
580 sub extension_found {
581 my ($extensions_ref, @extensions) = @_;
583 foreach my $extension (@extensions) {
584 if (exists $extensions_ref->{$extension}) {
594 # Parse command line arguments.
596 my $option_version = 0;
598 my $option_bindnow = 0;
599 my @option_ignore_arch = ();
600 my @option_ignore_flag = ();
601 my @option_ignore_arch_flag = ();
602 my @option_ignore_line = ();
603 my @option_ignore_arch_line = ();
605 my $option_arch = undef;
606 my $option_buildd = 0;
607 my $option_debian = 0;
609 my $option_line_numbers = 0;
610 if (not Getopt::Long::GetOptions(
611 'help|h|?' => \$option_help,
612 'version' => \$option_version,
614 'pie' => \$option_pie,
615 'bindnow' => \$option_bindnow,
616 'all' => \$option_all,
618 'ignore-arch=s' => \@option_ignore_arch,
619 'ignore-flag=s' => \@option_ignore_flag,
620 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
621 'ignore-line=s' => \@option_ignore_line,
622 'ignore-arch-line=s' => \@option_ignore_arch_line,
624 'color' => \$option_color,
625 'arch=s' => \$option_arch,
626 'buildd' => \$option_buildd,
627 'debian' => \$option_debian,
628 'line-numbers' => \$option_line_numbers,
631 Pod::Usage::pod2usage(2);
635 Pod::Usage::pod2usage(1);
637 if ($option_version) {
639 blhc $VERSION Copyright (C) 2012-2018 Simon Ruderich
641 This program is free software: you can redistribute it and/or modify
642 it under the terms of the GNU General Public License as published by
643 the Free Software Foundation, either version 3 of the License, or
644 (at your option) any later version.
646 This program is distributed in the hope that it will be useful,
647 but WITHOUT ANY WARRANTY; without even the implied warranty of
648 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
649 GNU General Public License for more details.
651 You should have received a copy of the GNU General Public License
652 along with this program. If not, see <http://www.gnu.org/licenses/>.
658 if (scalar @ARGV == 0) {
660 Pod::Usage::pod2usage(2);
663 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
664 # installed on Debian's buildds.
665 if (not $option_buildd) {
666 require Term::ANSIColor;
674 # Precompiled ignores for faster lookup.
675 my %option_ignore_arch_flag = ();
676 my %option_ignore_arch_line = ();
678 # Strip flags which should be ignored.
679 if (scalar @option_ignore_flag > 0) {
680 remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
682 # Same for arch specific ignore flags, but only prepare here.
683 if (scalar @option_ignore_arch_flag > 0) {
684 foreach my $ignore (@option_ignore_arch_flag) {
685 my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
687 if (not $ignore_arch or not $ignore_flag) {
688 printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
689 . '("arch:flag" expected)' . "\n", $ignore;
691 Pod::Usage::pod2usage(2);
694 push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
698 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
700 foreach my $flags (@flag_refs_all) {
701 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
704 # Precompile ignore line regexps, also anchor at beginning and end of line.
705 foreach my $ignore (@option_ignore_line) {
706 $ignore = qr/^$ignore$/;
708 # Same for arch specific ignore lines.
709 if (scalar @option_ignore_arch_line > 0) {
710 foreach my $ignore (@option_ignore_arch_line) {
711 my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
713 if (not $ignore_arch or not $ignore_line) {
714 printf STDERR 'Value "%s" invalid for option ignore-arch-line '
715 . '("arch:line" expected)' . "\n", $ignore;
717 Pod::Usage::pod2usage(2);
720 push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
728 foreach my $file (@ARGV) {
729 print "checking '$file'...\n" if scalar @ARGV > 1;
731 -f $file or die "No such file: $file";
733 open my $fh, '<', $file or die $!;
735 # Architecture of this file.
736 my $arch = $option_arch;
738 # Hardening options. Not all architectures support all hardening options.
739 my $harden_format = 1;
740 my $harden_fortify = 1;
741 my $harden_stack = 1;
742 my $harden_stack_strong = 1;
743 my $harden_relro = 1;
744 my $harden_bindnow = $option_bindnow; # defaults to 0
745 my $harden_pie = $option_pie; # defaults to 0
747 # Does this build log use ada? Ada also uses gcc as compiler but uses
748 # different CFLAGS. But only perform ada checks if an ada compiler is used
749 # for performance reasons.
751 # Fortran also requires different CFLAGS.
754 # Number of parallel jobs to prevent false positives when detecting
755 # non-verbose builds. As not all jobs declare the number of parallel jobs
756 # use a large enough default.
759 # Don't check for PIE flags if automatically applied by the compiler. Only
760 # used in buildd and Debian mode.
761 my $disable_harden_pie = 0;
762 if ($option_debian) {
763 $disable_harden_pie = 1;
767 while (my $line = <$fh>) {
770 # Detect architecture automatically unless overridden. For buildd logs
771 # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
772 # build logs which aren't built (wrong architecture, build error,
775 if (index($line, 'Build Architecture: ') == 0) {
776 $arch = substr $line, 20, -1; # -1 to ignore '\n' at the end
777 # For old logs (sbuild << 0.63.0-1).
778 } elsif (index($line, 'Architecture: ') == 0) {
779 $arch = substr $line, 14, -1; # -1 to ignore '\n' at the end
783 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
784 # check for hardening flags in buildd mode if an older dpkg-dev is
785 # used. Default flags (-g -O2) are still checked.
787 # Packages which were built before 1.16.1 but used their own hardening
788 # flags are not checked.
790 # Strong stack protector is used since dpkg 1.17.11.
792 # Recent GCC versions automatically use PIE (only on supported
793 # architectures) and dpkg respects this properly since 1.18.15 and
794 # doesn't pass PIE flags manually.
796 and index($line, 'Toolchain package versions: ') == 0) {
797 require Dpkg::Version;
800 my $disable_strong = 1;
802 if ($line =~ /\bdpkg-dev_(\S+)/) {
803 if (Dpkg::Version::version_compare($1, '1.16.1') >= 0) {
806 if (Dpkg::Version::version_compare($1, '1.17.11') >= 0) {
809 if (Dpkg::Version::version_compare($1, '1.18.15') >= 0) {
810 $disable_harden_pie = 1;
822 if ($disable_strong) {
823 $harden_stack_strong = 0;
827 # The following two versions of CMake in Debian obeyed CPPFLAGS, but
828 # this was later dropped because upstream rejected the patch. Thus
829 # build logs with these versions will have fortify hardening flags
830 # enabled, even though they may be not correctly set and are missing
831 # when build with later CMake versions. Thanks to Aron Xu for letting
833 if (index($line, 'Package versions: ') == 0
834 and $line =~ /\bcmake_(\S+)/
835 and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
836 if (not $option_buildd) {
837 error_invalid_cmake($1);
838 $exit |= $exit_code{invalid_cmake};
840 print "$buildd_tag{invalid_cmake}|$1|\n";
844 # Debian's build daemons use "Filtered Build-Depends:" (or just
845 # "Build-Depends:" in older versions) for the build dependencies, but
846 # pbuilder uses "Depends:"; support both.
847 if (index($line, 'Filtered Build-Depends: ') == 0
848 or index($line, 'Build-Depends: ') == 0
849 or index($line, 'Depends: ') == 0) {
850 # If hardening wrapper is used (wraps calls to gcc and adds
851 # hardening flags automatically) we can't perform any checks,
853 if ($line =~ /\bhardening-wrapper\b/) {
854 if (not $option_buildd) {
855 error_hardening_wrapper();
856 $exit |= $exit_code{hardening_wrapper};
858 print "$buildd_tag{hardening_wrapper}||\n";
864 if ($line =~ /\bgnat\b/) {
868 if ($line =~ /\bgfortran\b/) {
873 # This flags is not always available, but if it is use it.
874 if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
878 # We skip over unimportant lines at the beginning of the log to
879 # prevent false positives.
880 last if index($line, 'dpkg-buildpackage: ') == 0;
883 # Input lines, contain only the lines with compiler commands.
885 # Non-verbose lines in the input. Used to reduce calls to
886 # is_non_verbose_build() (which is quite slow) in the second loop when
887 # it's already clear if a line is non-verbose or not.
888 my @input_nonverbose = ();
890 my @input_number = ();
892 my $continuation = 0;
893 my $complete_line = undef;
895 while (my $line = <$fh>) {
898 # And stop at the end of the build log. Package details (reported by
899 # the buildd logs) are not important for us. This also prevents false
901 last if index($line, 'Build finished at ') == 0
902 and $line =~ /^Build finished at \d{8}-\d{4}$/;
904 if (not $continuation) {
908 # Detect architecture automatically unless overridden.
910 and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
911 $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
913 # Old buildd logs use e.g. "host architecture is alpha", remove
914 # the "is", otherwise debarch_to_debtriplet() will not detect the
916 if (index($arch, 'is ') == 0) {
917 $arch = substr $arch, 3;
921 next if $line =~ /^\s*#/;
922 # Ignore compiler warnings for now.
923 next if $line =~ /$warning_regex/o;
925 if (not $option_buildd and index($line, "\033") != -1) { # \033 = esc
926 # Remove all ANSI color sequences which are sometimes used in
927 # non-verbose builds.
928 $line = Term::ANSIColor::colorstrip($line);
929 # Also strip '\0xf' (delete previous character), used by Elinks'
932 # And "ESC(B" which seems to be used on armhf and hurd (not sure
934 $line =~ s/\033\(B//g;
937 # Check if this line indicates a non verbose build.
939 $non_verbose |= is_non_verbose_build($line, \$skip);
942 # One line may contain multiple commands (";"). Treat each one as
943 # single line. parse_line() is slow, only use it when necessary.
944 my @line = (index($line, ';') == -1)
947 # Ensure newline at the line end - necessary for
948 # correct parsing later.
951 } Text::ParseWords::parse_line(';', 1, $line);
952 foreach my $line (@line) {
956 # Join lines, but leave the "\" in place so it's clear where
957 # the original line break was.
958 chomp $complete_line;
959 $complete_line .= ' ' . $line;
961 # Line continuation, line ends with "\".
962 if ($line =~ /\\$/) {
964 # Start line continuation.
965 if (not defined $complete_line) {
966 $complete_line = $line;
971 # Use the complete line if a line continuation occurred.
972 if (defined $complete_line) {
973 $line = $complete_line;
974 $complete_line = undef;
977 # Ignore lines with no compiler commands.
978 next if not $non_verbose
979 and not $line =~ /$cc_regex_normal/o;
980 # Ignore lines with no filenames with extensions. May miss some
981 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
982 # a problem as the log will most likely contain other non-verbose
983 # commands which are detected.
984 next if not $non_verbose
985 and not $line =~ /$file_extension_regex/o;
987 # Ignore false positives.
989 # `./configure` output.
990 next if not $non_verbose
991 and $line =~ /^(?:checking|[Cc]onfigure:) /;
992 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
993 [Cc]ompiler[\s.]*:?\s+
995 next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
996 \s*=\s*$cc_regex_full
997 # optional compiler options, don't allow
998 # "everything" here to prevent false negatives
999 \s*(?:\s-\S+)*\s*$}xo;
1000 # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
1001 # line (or similar for other architectures) which gets recognized
1002 # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
1003 # C++ files. No hardening flags are relevant during this step,
1004 # thus ignore `moc-qt*` lines. The resulting files will be
1005 # compiled in a separate step (and therefore checked).
1006 next if $line =~ m{^\S+/bin/moc(?:-qt[45])?
1008 -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
1010 # Ignore false positives when the line contains only CC=gcc but no
1011 # other gcc command.
1012 if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
1015 next if not $before =~ /$cc_regex_normal/o
1016 and not $after =~ /$cc_regex_normal/o;
1018 # Ignore false positives caused by gcc -v. It outputs a line
1019 # looking like a normal compiler line but which is sometimes
1020 # missing hardening flags, although the normal compiler line
1022 next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
1023 [0-9.]+/cc1(?:plus)?}xo;
1024 # Ignore false positive with `rm` which may remove files which
1025 # look like a compiler executable thus causing the line to be
1026 # treated as a normal compiler line.
1027 next if $line =~ m{^\s*rm\s+};
1028 # Some build systems emit "gcc > file".
1029 next if $line =~ m{$cc_regex_normal\s*>\s*\S+};
1031 # Check if additional hardening options were used. Used to ensure
1032 # they are used for the complete build.
1033 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie,
1035 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
1038 push @input_nonverbose, $non_verbose;
1039 push @input_number, $number if $option_line_numbers;
1043 close $fh or die $!;
1045 # Ignore arch if requested.
1046 if (scalar @option_ignore_arch > 0 and $arch) {
1047 foreach my $ignore (@option_ignore_arch) {
1048 if ($arch eq $ignore) {
1049 print "ignoring architecture '$arch'\n";
1055 if (scalar @input == 0) {
1056 if (not $option_buildd) {
1057 print "No compiler commands!\n";
1058 $exit |= $exit_code{no_compiler_commands};
1060 print "$buildd_tag{no_compiler_commands}||\n";
1065 if ($option_buildd) {
1066 $statistics{commands} += scalar @input;
1069 # Option or auto detected.
1071 # The following was partially copied from dpkg-dev 1.19.0.5
1072 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, _add_build_flags()),
1073 # copyright Raphaël Hertzog <hertzog@debian.org>, Guillem Jover
1074 # <guillem@debian.org>, Kees Cook <kees@debian.org>, Canonical, Ltd.
1075 # licensed under GPL version 2 or later. Keep it in sync.
1079 # Recent dpkg versions use a quadruplet for arch. Support both.
1081 (undef, undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
1084 (undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
1087 my %builtin_pie_arch = map { $_ => 1 } qw(
1088 amd64 arm64 armel armhf hurd-i386 i386 kfreebsd-amd64 kfreebsd-i386
1089 mips mipsel mips64el powerpc ppc64 ppc64el s390x sparc sparc64
1092 # Disable unsupported hardening options.
1093 if ($os !~ /^(?:linux|kfreebsd|knetbsd|hurd)$/
1094 or $cpu =~ /^(?:hppa|avr32)$/) {
1097 if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
1099 $harden_stack_strong = 0;
1101 if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
1103 $harden_bindnow = 0;
1106 if ($disable_harden_pie and exists $builtin_pie_arch{$arch}) {
1112 my @cflags = @def_cflags;
1113 my @cxxflags = @def_cxxflags;
1114 my @cppflags = @def_cppflags;
1115 my @ldflags = @def_ldflags;
1116 # Check the specified hardening options, same order as dpkg-buildflags.
1118 @cflags = (@cflags, @def_cflags_pie);
1119 @cxxflags = (@cxxflags, @def_cflags_pie);
1120 @ldflags = (@ldflags, @def_ldflags_pie);
1122 if ($harden_stack_strong) {
1123 @cflags = (@cflags, @def_cflags_stack_strong);
1124 @cxxflags = (@cxxflags, @def_cflags_stack_strong);
1125 } elsif ($harden_stack) {
1126 @cflags = (@cflags, @def_cflags_stack);
1127 @cxxflags = (@cxxflags, @def_cflags_stack);
1129 if ($harden_fortify) {
1130 @cflags = (@cflags, @def_cflags_fortify);
1131 @cxxflags = (@cxxflags, @def_cflags_fortify);
1132 @cppflags = (@cppflags, @def_cppflags_fortify);
1134 if ($harden_format) {
1135 @cflags = (@cflags, @def_cflags_format);
1136 @cxxflags = (@cxxflags, @def_cflags_format);
1138 if ($harden_relro) {
1139 @ldflags = (@ldflags, @def_ldflags_relro);
1141 if ($harden_bindnow) {
1142 @ldflags = (@ldflags, @def_ldflags_bindnow);
1145 # Ada doesn't support format hardening flags, see #680117 for more
1146 # information. Same for fortran. Filter them out if either language is
1149 my @cflags_noformat;
1150 if (($ada or $fortran) and $harden_format) {
1151 @cflags_noformat = grep {
1153 foreach my $flag (@def_cflags_format) {
1154 $ok = 0 if $_ eq $flag;
1160 # Hack to fix cppflags_fortify_broken() if --ignore-flag
1161 # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
1162 # as long as @def_cppflags_fortify contains only one variable.
1163 if (scalar @def_cppflags_fortify == 0) {
1164 $harden_fortify = 0;
1167 # Ignore flags for this arch if requested.
1168 if ($arch and exists $option_ignore_arch_flag{$arch}) {
1169 my @local_flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
1171 remove_flags(\@local_flag_refs,
1173 @{$option_ignore_arch_flag{$arch}});
1176 my @ignore_line = @option_ignore_line;
1177 # Ignore lines for this arch if requested.
1178 if ($arch and exists $option_ignore_arch_line{$arch}) {
1179 @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
1183 for (my $i = 0; $i < scalar @input; $i++) {
1184 my $line = $input[$i];
1186 # Ignore line if requested.
1187 foreach my $ignore (@ignore_line) {
1188 next LINE if $line =~ /$ignore/;
1192 if ($input_nonverbose[$i]
1193 and is_non_verbose_build($line, \$skip,
1194 \@input, $i, $parallel)) {
1195 if (not $option_buildd) {
1196 error_non_verbose_build($line, $input_number[$i]);
1197 $exit |= $exit_code{non_verbose_build};
1199 $statistics{commands_nonverbose}++;
1203 # Even if it's a verbose build, we might have to skip this line (see
1204 # is_non_verbose_build()).
1207 my $orig_line = $line;
1209 # Remove everything until and including the compiler command. Makes
1210 # checks easier and faster.
1211 $line =~ s/^.*?$cc_regex//o;
1212 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
1213 # the brace and similar characters at the line end.
1214 $line =~ s/['")]+$//;
1216 # Skip unnecessary tests when only preprocessing.
1217 my $flag_preprocess = 0;
1224 # Preprocess, compile, assemble.
1225 if ($line =~ /\s(-E|-S|-c)\b/) {
1227 $flag_preprocess = 1 if $1 eq '-E';
1228 $compile = 1 if $1 eq '-S' or $1 eq '-c';
1229 # Dependency generation for Makefiles. The other flags (-MF -MG -MP
1230 # -MT -MQ) are always used with -M/-MM.
1231 } elsif ($line =~ /\s(?:-M|-MM)\b/) {
1233 # Otherwise assume we are linking.
1238 # -MD/-MMD also cause dependency generation, but they don't imply -E!
1239 if ($line =~ /\s(?:-MD|-MMD)\b/) {
1241 $flag_preprocess = 0;
1244 # Dependency generation for Makefiles, no preprocessing or other flags
1246 next if $dependency;
1248 # Get all file extensions on this line.
1249 my @extensions = $line =~ /$file_extension_regex/go;
1250 # Ignore all unknown extensions to speedup the search below.
1251 @extensions = grep { exists $extension{$_} } @extensions;
1253 # These file types don't require preprocessing.
1254 if (extension_found(\%extensions_no_preprocess, @extensions)) {
1257 # These file types require preprocessing.
1258 if (extension_found(\%extensions_preprocess, @extensions)) {
1259 # Prevent false positives with "libtool: link: g++ -include test.h
1260 # .." compiler lines.
1261 if ($orig_line !~ /$libtool_link_regex/o) {
1266 if (not $flag_preprocess) {
1267 # If there are source files then it's compiling/linking in one
1268 # step and we must check both. We only check for source files
1269 # here, because header files cause too many false positives.
1270 if (extension_found(\%extensions_compile_link, @extensions)) {
1271 # Assembly files don't need CFLAGS.
1272 if (not extension_found(\%extensions_compile, @extensions)
1273 and extension_found(\%extensions_no_compile, @extensions)) {
1275 # But the rest does.
1279 # No compilable extensions found, either linking or compiling
1282 # If there are also no object files we are just compiling headers
1283 # (.h -> .h.gch). Don't check for linker flags in this case. Due
1284 # to our liberal checks for compiler lines, this also reduces the
1285 # number of false positives considerably.
1287 and not extension_found(\%extensions_object, @extensions)) {
1292 my $compile_cpp = 0;
1293 my $restore_cflags = 0;
1294 # Assume CXXFLAGS are required when a C++ file is specified in the
1297 and extension_found(\%extensions_compile_cpp, @extensions)) {
1300 # Ada needs special CFLAGS, use them if only ada files are compiled.
1302 and extension_found(\%extensions_ada, @extensions)) {
1303 $restore_cflags = 1;
1304 $preprocess = 0; # Ada uses no CPPFLAGS
1305 @cflags_backup = @cflags;
1306 @cflags = @cflags_noformat;
1309 and extension_found(\%extensions_fortran, @extensions)) {
1310 $restore_cflags = 1;
1311 @cflags_backup = @cflags;
1312 @cflags = @cflags_noformat;
1315 if ($option_buildd) {
1316 $statistics{preprocess}++ if $preprocess;
1317 $statistics{compile}++ if $compile;
1318 $statistics{compile_cpp}++ if $compile_cpp;
1319 $statistics{link}++ if $link;
1322 # Check if there are flags indicating a debug build. If that's true,
1323 # skip the check for -O2. This prevents fortification, but that's fine
1324 # for a debug build.
1325 if (any_flags_used($line, @def_cflags_debug)) {
1326 remove_flags([\@cflags], \%flag_renames, $def_cflags[1]);
1327 remove_flags([\@cppflags], \%flag_renames, $def_cppflags_fortify[0]);
1330 # Check hardening flags.
1332 if ($compile and not all_flags_used($line, \@missing, @cflags)
1333 # Libraries linked with -fPIC don't have to (and can't) be
1334 # linked with -fPIE as well. It's no error if only PIE flags
1336 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1337 # Assume dpkg-buildflags returns the correct flags.
1338 and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
1339 if (not $option_buildd) {
1340 error_flags('CFLAGS missing', \@missing, \%flag_renames,
1341 $input[$i], $input_number[$i]);
1342 $exit |= $exit_code{flags_missing};
1344 $statistics{compile_missing}++;
1346 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
1347 # Libraries linked with -fPIC don't have to (and can't) be
1348 # linked with -fPIE as well. It's no error if only PIE flags
1350 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1351 # Assume dpkg-buildflags returns the correct flags.
1352 and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
1353 if (not $option_buildd) {
1354 error_flags('CXXFLAGS missing', \@missing, \%flag_renames,
1355 $input[$i], $input_number[$i]);
1356 $exit |= $exit_code{flags_missing};
1358 $statistics{compile_cpp_missing}++;
1362 and (not all_flags_used($line, \@missing, @cppflags)
1363 # The fortify flag might be overwritten, detect that.
1365 and cppflags_fortify_broken($line, \@missing)))
1366 # Assume dpkg-buildflags returns the correct flags.
1367 and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
1368 if (not $option_buildd) {
1369 error_flags('CPPFLAGS missing', \@missing, \%flag_renames,
1370 $input[$i], $input_number[$i]);
1371 $exit |= $exit_code{flags_missing};
1373 $statistics{preprocess_missing}++;
1376 if ($link and not all_flags_used($line, \@missing, @ldflags)
1377 # Same here, -fPIC conflicts with -fPIE.
1378 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
1379 # Assume dpkg-buildflags returns the correct flags.
1380 and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
1381 if (not $option_buildd) {
1382 error_flags('LDFLAGS missing', \@missing, \%flag_renames,
1383 $input[$i], $input_number[$i]);
1384 $exit |= $exit_code{flags_missing};
1386 $statistics{link_missing}++;
1390 # Restore normal CFLAGS.
1391 if ($restore_cflags) {
1392 @cflags = @cflags_backup;
1397 # Print statistics for buildd mode, only output in this mode.
1398 if ($option_buildd) {
1401 if ($statistics{preprocess_missing}) {
1402 push @warning, sprintf 'CPPFLAGS %d (of %d)',
1403 $statistics{preprocess_missing},
1404 $statistics{preprocess};
1406 if ($statistics{compile_missing}) {
1407 push @warning, sprintf 'CFLAGS %d (of %d)',
1408 $statistics{compile_missing},
1409 $statistics{compile};
1411 if ($statistics{compile_cpp_missing}) {
1412 push @warning, sprintf 'CXXFLAGS %d (of %d)',
1413 $statistics{compile_cpp_missing},
1414 $statistics{compile_cpp};
1416 if ($statistics{link_missing}) {
1417 push @warning, sprintf 'LDFLAGS %d (of %d)',
1418 $statistics{link_missing},
1421 if (scalar @warning) {
1422 local $" = ', '; # array join string
1423 print "$buildd_tag{flags_missing}|@warning missing|\n";
1426 if ($statistics{commands_nonverbose}) {
1427 printf "$buildd_tag{non_verbose_build}|%d (of %d) hidden|\n",
1428 $statistics{commands_nonverbose},
1429 $statistics{commands},
1441 blhc - build log hardening check, checks build logs for missing hardening flags
1445 B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>
1449 blhc is a small tool which checks build logs for missing hardening flags. It's
1450 licensed under the GPL 3 or later.
1452 It's designed to check build logs generated by Debian's dpkg-buildpackage (or
1453 tools using dpkg-buildpackage like pbuilder or sbuild (which is used for the
1454 official buildd build logs)) to help maintainers detect missing hardening
1455 flags in their packages.
1457 Only gcc is detected as compiler at the moment. If other compilers support
1458 hardening flags as well, please report them.
1460 If there's no output, no flags are missing and the build log is fine.
1462 See F<README> for details about performed checks, auto-detection and
1471 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
1474 =item B<--arch> I<architecture>
1476 Set the specific architecture (e.g. amd64, armel, etc.), automatically
1477 disables hardening flags not available on this architecture. Is detected
1478 automatically if dpkg-buildpackage is used.
1482 Force check for all +bindnow hardening flags. By default it's auto detected.
1486 Special mode for buildds when automatically parsing log files. The following
1487 changes are in effect:
1493 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1498 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1503 Don't require Term::ANSIColor.
1507 Return exit code 0, unless there was a error (-I, -W messages don't count as
1514 Apply Debian-specific settings. At the moment this only disables checking for
1515 PIE which is automatically applied by Debian's GCC and no longer requires a
1516 compiler command line argument.
1520 Use colored (ANSI) output for warning messages.
1522 =item B<--line-numbers>
1524 Display line numbers.
1526 =item B<--ignore-arch> I<arch>
1528 Ignore build logs from architectures matching I<arch>. I<arch> is a string.
1530 Used to prevent false positives. This option can be specified multiple times.
1532 =item B<--ignore-arch-flag> I<arch>:I<flag>
1534 Like B<--ignore-flag>, but only ignore flag on I<arch>.
1536 =item B<--ignore-arch-line> I<arch>:I<line>
1538 Like B<--ignore-line>, but only ignore line on I<arch>.
1540 =item B<--ignore-flag> I<flag>
1542 Don't print an error when the specific flag is missing in a compiler line.
1543 I<flag> is a string.
1545 Used to prevent false positives. This option can be specified multiple times.
1547 =item B<--ignore-line> I<regex>
1549 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1550 at the beginning and end of the line to prevent false negatives.
1552 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1553 warnings (which have line continuation resolved).
1555 Used to prevent false positives. This option can be specified multiple times.
1559 Force check for all +pie hardening flags. By default it's auto detected.
1561 =item B<-h -? --help>
1563 Print available options.
1567 Print version number and license.
1571 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1572 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1573 all other commands as well.
1577 Normal usage, parse a single log file.
1579 blhc path/to/log/file
1581 If there's no output, no flags are missing and the build log is fine.
1583 Parse multiple log files. The exit code is ORed over all files.
1585 blhc path/to/directory/with/log/files/*
1587 Don't treat missing C<-g> as error:
1589 blhc --ignore-flag -g path/to/log/file
1591 Don't treat missing C<-pie> on kfreebsd-amd64 as error:
1593 blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
1595 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1598 blhc --ignore-line '\./script gcc file' path/to/log/file
1600 Ignore lines matching C<./script gcc file> somewhere in the line.
1602 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1604 Use blhc with pbuilder.
1606 pbuilder path/to/package.dsc | tee path/log/file
1607 blhc path/to/file || echo flags missing
1609 Assume this build log was created on a Debian system and thus don't warn about
1610 missing PIE flags if the current architecture injects them automatically (this
1611 is enabled in buildd mode per default). C<--arch> is necessary if the build
1612 log contains no architecture information as written by dpkg-buildpackage.
1614 blhc --debian --all --arch=amd64 path/to/log/file
1618 The following tags are used in I<--buildd> mode. In braces the additional data
1623 =item B<I-hardening-wrapper-used>
1625 The package uses hardening-wrapper which intercepts calls to gcc and adds
1626 hardening flags. The build log doesn't contain any hardening flags and thus
1627 can't be checked by blhc.
1629 =item B<W-compiler-flags-hidden> (summary of hidden lines)
1631 Build log contains lines which hide the real compiler flags. For example:
1638 Most of the time either C<export V=1> or C<export verbose=1> in
1639 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1640 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1641 patched to remove the C<@>s hiding the real compiler commands.
1643 =item B<W-dpkg-buildflags-missing> (summary of missing flags)
1645 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1647 =item B<I-invalid-cmake-used> (version)
1649 By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
1650 patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
1651 patch was rejected by upstream and later reverted in Debian. Thus those two
1652 versions show correct usage of CPPFLAGS even if the package doesn't correctly
1653 handle them (for example by passing them to CFLAGS). To prevent false
1654 negatives just blacklist those two versions.
1656 =item B<I-no-compiler-commands>
1658 No compiler commands were detected. Either the log contains none or they were
1659 not correctly detected by blhc (please report the bug in this case).
1665 The exit status is a "bit mask", each listed status is ORed when the error
1666 condition occurs to get the result.
1676 No compiler commands were found.
1680 Invalid arguments/options given to blhc.
1688 Missing hardening flags.
1692 Hardening wrapper detected, no tests performed.
1696 Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
1697 TAGS"> for a detailed explanation.
1703 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1705 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1706 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1708 =head1 LICENSE AND COPYRIGHT
1710 Copyright (C) 2012-2018 by Simon Ruderich
1712 This program is free software: you can redistribute it and/or modify
1713 it under the terms of the GNU General Public License as published by
1714 the Free Software Foundation, either version 3 of the License, or
1715 (at your option) any later version.
1717 This program is distributed in the hope that it will be useful,
1718 but WITHOUT ANY WARRANTY; without even the implied warranty of
1719 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1720 GNU General Public License for more details.
1722 You should have received a copy of the GNU General Public License
1723 along with this program. If not, see <http://www.gnu.org/licenses/>.
1727 L<hardening-check(1)>, L<dpkg-buildflags(1)>