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;
430 # Check if any of \@bad_flags occurs after $good_flag. Doesn't check if
431 # $good_flag is present.
432 sub flag_overwritten {
433 my ($line, $good_flag, $bad_flags) = @_;
435 if (not any_flags_used($line, @{$bad_flags})) {
440 foreach my $flag (@{$bad_flags}) {
441 while ($line =~ /$flag/g) {
442 if ($bad_pos < $+[0]) {
448 while ($line =~ /$good_flag/g) {
451 if ($good_pos > $bad_pos) {
457 sub cppflags_fortify_broken {
458 my ($line, $missing_flags) = @_;
460 # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
461 my $fortify_source = $def_cppflags_fortify[0];
463 # Some build systems enable/disable fortify source multiple times, check
465 if (not flag_overwritten($line,
467 \@def_cppflags_fortify_bad)) {
470 push @{$missing_flags}, $fortify_source;
474 # Modifies $missing_flags_ref array.
475 sub pic_pie_conflict {
476 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
478 return 0 if not $pie;
479 return 0 if not any_flags_used($line, @def_ldflags_pic);
481 my %flags = map { $_ => 1 } @flags_pie;
483 # Remove all PIE flags from @missing_flags as they are not required with
486 not exists $flags{$_}
487 } @{$missing_flags_ref};
488 @{$missing_flags_ref} = @result;
490 # We got a conflict when no flags are left, thus only PIE flags were
491 # missing. If other flags were missing abort because the conflict is not
493 return scalar @result == 0;
496 sub is_non_verbose_build {
497 my ($line, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
499 if ($line =~ /$libtool_regex/o) {
500 # libtool's --silent hides the real compiler flags.
501 if ($line =~ /\s--silent/) {
503 # If --silent is not present, skip this line as some compiler flags
504 # might be missing (e.g. -fPIE) which are handled correctly by libtool
505 # internally. libtool displays the real compiler command on the next
506 # line, so the flags are checked as usual.
513 if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
514 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
515 or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
516 or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
517 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
523 # C++ compiler setting.
524 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
525 return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
526 # "Compiling" non binary files.
527 return 0 if $line =~ /^\s*Compiling \S+\.(?:py|el)['"]?\s*(?:\.\.\.)?$/;
528 # "Compiling" with no file name.
529 if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
530 # $file_extension_regex may need spaces around the filename.
531 return 0 if not " $1 " =~ /$file_extension_regex/o;
536 # On the first pass we only check if this line is verbose or not.
537 return 1 if not defined $input_ref;
539 # Second pass, we have access to the next lines.
542 # CMake and other build systems print the non-verbose messages also when
543 # building verbose. If a compiler and the file name occurs in the next
544 # lines, treat it as verbose build.
546 # Get filename, we can't use the complete path as only parts of it are
547 # used in the real compiler command.
548 $file =~ m{/([^/\s]+)$};
551 for (my $i = 1; $i <= $line_count; $i++) {
552 my $next_line = $input_ref->[$line_offset + $i];
553 last unless defined $next_line;
555 if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
556 # Not a non-verbose line, but we still have to skip the
557 # current line as it doesn't contain any compiler commands.
567 # Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
569 my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
571 my %removes = map { $_ => 1 } @flags;
572 foreach my $flags (@{$flag_refs_ref}) {
574 # Flag found as string.
575 not exists $removes{$_}
576 # Flag found as string representation of regexp.
577 and (not defined $flag_renames_ref->{$_}
578 or not exists $removes{$flag_renames_ref->{$_}})
585 # Modifies $flag_renames_ref hash.
586 sub compile_flag_regexp {
587 my ($flag_renames_ref, @flags) = @_;
590 foreach my $flag (@flags) {
591 # Compile flag regexp for faster execution.
592 my $regex = qr/\s$flag(?:\s|\\)/;
594 # Store flag name in replacement string for correct flags in messages
595 # with qr//ed flag regexps.
596 $flag_renames_ref->{$regex}
597 = (exists $flag_renames_ref->{$flag})
598 ? $flag_renames_ref->{$flag}
601 push @result, $regex;
606 # Does any extension in @extensions exist in %{$extensions_ref}?
607 sub extension_found {
608 my ($extensions_ref, @extensions) = @_;
610 foreach my $extension (@extensions) {
611 if (exists $extensions_ref->{$extension}) {
621 # Parse command line arguments.
623 my $option_version = 0;
625 my $option_bindnow = 0;
626 my @option_ignore_arch = ();
627 my @option_ignore_flag = ();
628 my @option_ignore_arch_flag = ();
629 my @option_ignore_line = ();
630 my @option_ignore_arch_line = ();
632 my $option_arch = undef;
633 my $option_buildd = 0;
634 my $option_debian = 0;
636 my $option_line_numbers = 0;
637 if (not Getopt::Long::GetOptions(
638 'help|h|?' => \$option_help,
639 'version' => \$option_version,
641 'pie' => \$option_pie,
642 'bindnow' => \$option_bindnow,
643 'all' => \$option_all,
645 'ignore-arch=s' => \@option_ignore_arch,
646 'ignore-flag=s' => \@option_ignore_flag,
647 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
648 'ignore-line=s' => \@option_ignore_line,
649 'ignore-arch-line=s' => \@option_ignore_arch_line,
651 'color' => \$option_color,
652 'arch=s' => \$option_arch,
653 'buildd' => \$option_buildd,
654 'debian' => \$option_debian,
655 'line-numbers' => \$option_line_numbers,
658 Pod::Usage::pod2usage(2);
662 Pod::Usage::pod2usage(1);
664 if ($option_version) {
666 blhc $VERSION Copyright (C) 2012-2018 Simon Ruderich
668 This program is free software: you can redistribute it and/or modify
669 it under the terms of the GNU General Public License as published by
670 the Free Software Foundation, either version 3 of the License, or
671 (at your option) any later version.
673 This program is distributed in the hope that it will be useful,
674 but WITHOUT ANY WARRANTY; without even the implied warranty of
675 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
676 GNU General Public License for more details.
678 You should have received a copy of the GNU General Public License
679 along with this program. If not, see <http://www.gnu.org/licenses/>.
685 if (scalar @ARGV == 0) {
687 Pod::Usage::pod2usage(2);
690 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
691 # installed on Debian's buildds.
692 if (not $option_buildd) {
693 require Term::ANSIColor;
701 # Precompiled ignores for faster lookup.
702 my %option_ignore_arch_flag = ();
703 my %option_ignore_arch_line = ();
705 # Strip flags which should be ignored.
706 if (scalar @option_ignore_flag > 0) {
707 remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
709 # Same for arch specific ignore flags, but only prepare here.
710 if (scalar @option_ignore_arch_flag > 0) {
711 foreach my $ignore (@option_ignore_arch_flag) {
712 my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
714 if (not $ignore_arch or not $ignore_flag) {
715 printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
716 . '("arch:flag" expected)' . "\n", $ignore;
718 Pod::Usage::pod2usage(2);
721 push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
725 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
727 foreach my $flags (@flag_refs_all) {
728 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
731 # Precompile ignore line regexps, also anchor at beginning and end of line.
732 foreach my $ignore (@option_ignore_line) {
733 $ignore = qr/^$ignore$/;
735 # Same for arch specific ignore lines.
736 if (scalar @option_ignore_arch_line > 0) {
737 foreach my $ignore (@option_ignore_arch_line) {
738 my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
740 if (not $ignore_arch or not $ignore_line) {
741 printf STDERR 'Value "%s" invalid for option ignore-arch-line '
742 . '("arch:line" expected)' . "\n", $ignore;
744 Pod::Usage::pod2usage(2);
747 push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
755 foreach my $file (@ARGV) {
756 print "checking '$file'...\n" if scalar @ARGV > 1;
758 -f $file or die "No such file: $file";
760 open my $fh, '<', $file or die $!;
762 # Architecture of this file.
763 my $arch = $option_arch;
765 # Hardening options. Not all architectures support all hardening options.
766 my $harden_format = 1;
767 my $harden_fortify = 1;
768 my $harden_stack = 1;
769 my $harden_stack_strong = 1;
770 my $harden_relro = 1;
771 my $harden_bindnow = $option_bindnow; # defaults to 0
772 my $harden_pie = $option_pie; # defaults to 0
774 # Does this build log use ada? Ada also uses gcc as compiler but uses
775 # different CFLAGS. But only perform ada checks if an ada compiler is used
776 # for performance reasons.
778 # Fortran also requires different CFLAGS.
781 # Number of parallel jobs to prevent false positives when detecting
782 # non-verbose builds. As not all jobs declare the number of parallel jobs
783 # use a large enough default.
786 # Don't check for PIE flags if automatically applied by the compiler. Only
787 # used in buildd and Debian mode.
788 my $disable_harden_pie = 0;
789 if ($option_debian) {
790 $disable_harden_pie = 1;
794 while (my $line = <$fh>) {
797 # Detect architecture automatically unless overridden. For buildd logs
798 # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
799 # build logs which aren't built (wrong architecture, build error,
802 if (index($line, 'Build Architecture: ') == 0) {
803 $arch = substr $line, 20, -1; # -1 to ignore '\n' at the end
804 # For old logs (sbuild << 0.63.0-1).
805 } elsif (index($line, 'Architecture: ') == 0) {
806 $arch = substr $line, 14, -1; # -1 to ignore '\n' at the end
810 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
811 # check for hardening flags in buildd mode if an older dpkg-dev is
812 # used. Default flags (-g -O2) are still checked.
814 # Packages which were built before 1.16.1 but used their own hardening
815 # flags are not checked.
817 # Strong stack protector is used since dpkg 1.17.11.
819 # Recent GCC versions automatically use PIE (only on supported
820 # architectures) and dpkg respects this properly since 1.18.15 and
821 # doesn't pass PIE flags manually.
823 and index($line, 'Toolchain package versions: ') == 0) {
824 require Dpkg::Version;
827 my $disable_strong = 1;
829 if ($line =~ /\bdpkg-dev_(\S+)/) {
830 if (Dpkg::Version::version_compare($1, '1.16.1') >= 0) {
833 if (Dpkg::Version::version_compare($1, '1.17.11') >= 0) {
836 if (Dpkg::Version::version_compare($1, '1.18.15') >= 0) {
837 $disable_harden_pie = 1;
849 if ($disable_strong) {
850 $harden_stack_strong = 0;
854 # The following two versions of CMake in Debian obeyed CPPFLAGS, but
855 # this was later dropped because upstream rejected the patch. Thus
856 # build logs with these versions will have fortify hardening flags
857 # enabled, even though they may be not correctly set and are missing
858 # when build with later CMake versions. Thanks to Aron Xu for letting
860 if (index($line, 'Package versions: ') == 0
861 and $line =~ /\bcmake_(\S+)/
862 and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
863 if (not $option_buildd) {
864 error_invalid_cmake($1);
865 $exit |= $exit_code{invalid_cmake};
867 print "$buildd_tag{invalid_cmake}|$1|\n";
871 # Debian's build daemons use "Filtered Build-Depends:" (or just
872 # "Build-Depends:" in older versions) for the build dependencies, but
873 # pbuilder uses "Depends:"; support both.
874 if (index($line, 'Filtered Build-Depends: ') == 0
875 or index($line, 'Build-Depends: ') == 0
876 or index($line, 'Depends: ') == 0) {
877 # If hardening wrapper is used (wraps calls to gcc and adds
878 # hardening flags automatically) we can't perform any checks,
880 if ($line =~ /\bhardening-wrapper\b/) {
881 if (not $option_buildd) {
882 error_hardening_wrapper();
883 $exit |= $exit_code{hardening_wrapper};
885 print "$buildd_tag{hardening_wrapper}||\n";
891 if ($line =~ /\bgnat\b/) {
895 if ($line =~ /\bgfortran\b/) {
900 # This flags is not always available, but if it is use it.
901 if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
905 # We skip over unimportant lines at the beginning of the log to
906 # prevent false positives.
907 last if index($line, 'dpkg-buildpackage: ') == 0;
910 # Input lines, contain only the lines with compiler commands.
912 # Non-verbose lines in the input. Used to reduce calls to
913 # is_non_verbose_build() (which is quite slow) in the second loop when
914 # it's already clear if a line is non-verbose or not.
915 my @input_nonverbose = ();
917 my @input_number = ();
919 my $continuation = 0;
920 my $complete_line = undef;
922 while (my $line = <$fh>) {
925 # And stop at the end of the build log. Package details (reported by
926 # the buildd logs) are not important for us. This also prevents false
928 last if index($line, 'Build finished at ') == 0
929 and $line =~ /^Build finished at \d{8}-\d{4}$/;
931 if (not $continuation) {
935 # Detect architecture automatically unless overridden.
937 and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
938 $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
940 # Old buildd logs use e.g. "host architecture is alpha", remove
941 # the "is", otherwise debarch_to_debtriplet() will not detect the
943 if (index($arch, 'is ') == 0) {
944 $arch = substr $arch, 3;
948 next if $line =~ /^\s*#/;
949 # Ignore compiler warnings for now.
950 next if $line =~ /$warning_regex/o;
952 if (not $option_buildd and index($line, "\033") != -1) { # \033 = esc
953 # Remove all ANSI color sequences which are sometimes used in
954 # non-verbose builds.
955 $line = Term::ANSIColor::colorstrip($line);
956 # Also strip '\0xf' (delete previous character), used by Elinks'
959 # And "ESC(B" which seems to be used on armhf and hurd (not sure
961 $line =~ s/\033\(B//g;
964 # Check if this line indicates a non verbose build.
966 $non_verbose |= is_non_verbose_build($line, \$skip);
969 # One line may contain multiple commands (";"). Treat each one as
970 # single line. parse_line() is slow, only use it when necessary.
971 my @line = (index($line, ';') == -1)
974 # Ensure newline at the line end - necessary for
975 # correct parsing later.
978 } Text::ParseWords::parse_line(';', 1, $line);
979 foreach my $line (@line) {
983 # Join lines, but leave the "\" in place so it's clear where
984 # the original line break was.
985 chomp $complete_line;
986 $complete_line .= ' ' . $line;
988 # Line continuation, line ends with "\".
989 if ($line =~ /\\$/) {
991 # Start line continuation.
992 if (not defined $complete_line) {
993 $complete_line = $line;
998 # Use the complete line if a line continuation occurred.
999 if (defined $complete_line) {
1000 $line = $complete_line;
1001 $complete_line = undef;
1004 # Ignore lines with no compiler commands.
1005 next if not $non_verbose
1006 and not $line =~ /$cc_regex_normal/o;
1007 # Ignore lines with no filenames with extensions. May miss some
1008 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
1009 # a problem as the log will most likely contain other non-verbose
1010 # commands which are detected.
1011 next if not $non_verbose
1012 and not $line =~ /$file_extension_regex/o;
1014 # Ignore false positives.
1016 # `./configure` output.
1017 next if not $non_verbose
1018 and $line =~ /^(?:checking|[Cc]onfigure:) /;
1019 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
1020 [Cc]ompiler[\s.]*:?\s+
1022 next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
1023 \s*=\s*$cc_regex_full
1024 # optional compiler options, don't allow
1025 # "everything" here to prevent false negatives
1026 \s*(?:\s-\S+)*\s*$}xo;
1027 # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
1028 # line (or similar for other architectures) which gets recognized
1029 # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
1030 # C++ files. No hardening flags are relevant during this step,
1031 # thus ignore `moc-qt*` lines. The resulting files will be
1032 # compiled in a separate step (and therefore checked).
1033 next if $line =~ m{^\S+/bin/moc(?:-qt[45])?
1035 -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
1037 # Ignore false positives when the line contains only CC=gcc but no
1038 # other gcc command.
1039 if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
1042 next if not $before =~ /$cc_regex_normal/o
1043 and not $after =~ /$cc_regex_normal/o;
1045 # Ignore false positives caused by gcc -v. It outputs a line
1046 # looking like a normal compiler line but which is sometimes
1047 # missing hardening flags, although the normal compiler line
1049 next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
1050 [0-9.]+/cc1(?:plus)?}xo;
1051 # Ignore false positive with `rm` which may remove files which
1052 # look like a compiler executable thus causing the line to be
1053 # treated as a normal compiler line.
1054 next if $line =~ m{^\s*rm\s+};
1055 # Some build systems emit "gcc > file".
1056 next if $line =~ m{$cc_regex_normal\s*>\s*\S+};
1058 # Check if additional hardening options were used. Used to ensure
1059 # they are used for the complete build.
1060 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie,
1062 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
1065 push @input_nonverbose, $non_verbose;
1066 push @input_number, $number if $option_line_numbers;
1070 close $fh or die $!;
1072 # Ignore arch if requested.
1073 if (scalar @option_ignore_arch > 0 and $arch) {
1074 foreach my $ignore (@option_ignore_arch) {
1075 if ($arch eq $ignore) {
1076 print "ignoring architecture '$arch'\n";
1082 if (scalar @input == 0) {
1083 if (not $option_buildd) {
1084 print "No compiler commands!\n";
1085 $exit |= $exit_code{no_compiler_commands};
1087 print "$buildd_tag{no_compiler_commands}||\n";
1092 if ($option_buildd) {
1093 $statistics{commands} += scalar @input;
1096 # Option or auto detected.
1098 # The following was partially copied from dpkg-dev 1.19.0.5
1099 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, _add_build_flags()),
1100 # copyright Raphaël Hertzog <hertzog@debian.org>, Guillem Jover
1101 # <guillem@debian.org>, Kees Cook <kees@debian.org>, Canonical, Ltd.
1102 # licensed under GPL version 2 or later. Keep it in sync.
1106 # Recent dpkg versions use a quadruplet for arch. Support both.
1108 (undef, undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
1111 (undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
1114 my %builtin_pie_arch = map { $_ => 1 } qw(
1115 amd64 arm64 armel armhf hurd-i386 i386 kfreebsd-amd64 kfreebsd-i386
1116 mips mipsel mips64el powerpc ppc64 ppc64el s390x sparc sparc64
1119 # Disable unsupported hardening options.
1120 if ($os !~ /^(?:linux|kfreebsd|knetbsd|hurd)$/
1121 or $cpu =~ /^(?:hppa|avr32)$/) {
1124 if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
1126 $harden_stack_strong = 0;
1128 if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
1130 $harden_bindnow = 0;
1133 if ($disable_harden_pie and exists $builtin_pie_arch{$arch}) {
1139 my @cflags = @def_cflags;
1140 my @cxxflags = @def_cxxflags;
1141 my @cppflags = @def_cppflags;
1142 my @ldflags = @def_ldflags;
1143 # Check the specified hardening options, same order as dpkg-buildflags.
1145 @cflags = (@cflags, @def_cflags_pie);
1146 @cxxflags = (@cxxflags, @def_cflags_pie);
1147 @ldflags = (@ldflags, @def_ldflags_pie);
1149 if ($harden_stack_strong) {
1150 @cflags = (@cflags, @def_cflags_stack_strong);
1151 @cxxflags = (@cxxflags, @def_cflags_stack_strong);
1152 } elsif ($harden_stack) {
1153 @cflags = (@cflags, @def_cflags_stack);
1154 @cxxflags = (@cxxflags, @def_cflags_stack);
1156 if ($harden_fortify) {
1157 @cflags = (@cflags, @def_cflags_fortify);
1158 @cxxflags = (@cxxflags, @def_cflags_fortify);
1159 @cppflags = (@cppflags, @def_cppflags_fortify);
1161 if ($harden_format) {
1162 @cflags = (@cflags, @def_cflags_format);
1163 @cxxflags = (@cxxflags, @def_cflags_format);
1165 if ($harden_relro) {
1166 @ldflags = (@ldflags, @def_ldflags_relro);
1168 if ($harden_bindnow) {
1169 @ldflags = (@ldflags, @def_ldflags_bindnow);
1172 # Ada doesn't support format hardening flags, see #680117 for more
1173 # information. Same for fortran. Filter them out if either language is
1176 my @cflags_noformat;
1177 if (($ada or $fortran) and $harden_format) {
1178 @cflags_noformat = grep {
1180 foreach my $flag (@def_cflags_format) {
1181 $ok = 0 if $_ eq $flag;
1187 # Hack to fix cppflags_fortify_broken() if --ignore-flag
1188 # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
1189 # as long as @def_cppflags_fortify contains only one variable.
1190 if (scalar @def_cppflags_fortify == 0) {
1191 $harden_fortify = 0;
1194 # Ignore flags for this arch if requested.
1195 if ($arch and exists $option_ignore_arch_flag{$arch}) {
1196 my @local_flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
1198 remove_flags(\@local_flag_refs,
1200 @{$option_ignore_arch_flag{$arch}});
1203 my @ignore_line = @option_ignore_line;
1204 # Ignore lines for this arch if requested.
1205 if ($arch and exists $option_ignore_arch_line{$arch}) {
1206 @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
1210 for (my $i = 0; $i < scalar @input; $i++) {
1211 my $line = $input[$i];
1213 # Ignore line if requested.
1214 foreach my $ignore (@ignore_line) {
1215 next LINE if $line =~ /$ignore/;
1219 if ($input_nonverbose[$i]
1220 and is_non_verbose_build($line, \$skip,
1221 \@input, $i, $parallel)) {
1222 if (not $option_buildd) {
1223 error_non_verbose_build($line, $input_number[$i]);
1224 $exit |= $exit_code{non_verbose_build};
1226 $statistics{commands_nonverbose}++;
1230 # Even if it's a verbose build, we might have to skip this line (see
1231 # is_non_verbose_build()).
1234 my $orig_line = $line;
1236 # Remove everything until and including the compiler command. Makes
1237 # checks easier and faster.
1238 $line =~ s/^.*?$cc_regex//o;
1239 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
1240 # the brace and similar characters at the line end.
1241 $line =~ s/['")]+$//;
1243 # Skip unnecessary tests when only preprocessing.
1244 my $flag_preprocess = 0;
1251 # Preprocess, compile, assemble.
1252 if ($line =~ /\s(-E|-S|-c)\b/) {
1254 $flag_preprocess = 1 if $1 eq '-E';
1255 $compile = 1 if $1 eq '-S' or $1 eq '-c';
1256 # Dependency generation for Makefiles. The other flags (-MF -MG -MP
1257 # -MT -MQ) are always used with -M/-MM.
1258 } elsif ($line =~ /\s(?:-M|-MM)\b/) {
1260 # Otherwise assume we are linking.
1265 # -MD/-MMD also cause dependency generation, but they don't imply -E!
1266 if ($line =~ /\s(?:-MD|-MMD)\b/) {
1268 $flag_preprocess = 0;
1271 # Dependency generation for Makefiles, no preprocessing or other flags
1273 next if $dependency;
1275 # Get all file extensions on this line.
1276 my @extensions = $line =~ /$file_extension_regex/go;
1277 # Ignore all unknown extensions to speedup the search below.
1278 @extensions = grep { exists $extension{$_} } @extensions;
1280 # These file types don't require preprocessing.
1281 if (extension_found(\%extensions_no_preprocess, @extensions)) {
1284 # These file types require preprocessing.
1285 if (extension_found(\%extensions_preprocess, @extensions)) {
1286 # Prevent false positives with "libtool: link: g++ -include test.h
1287 # .." compiler lines.
1288 if ($orig_line !~ /$libtool_link_regex/o) {
1293 if (not $flag_preprocess) {
1294 # If there are source files then it's compiling/linking in one
1295 # step and we must check both. We only check for source files
1296 # here, because header files cause too many false positives.
1297 if (extension_found(\%extensions_compile_link, @extensions)) {
1298 # Assembly files don't need CFLAGS.
1299 if (not extension_found(\%extensions_compile, @extensions)
1300 and extension_found(\%extensions_no_compile, @extensions)) {
1302 # But the rest does.
1306 # No compilable extensions found, either linking or compiling
1309 # If there are also no object files we are just compiling headers
1310 # (.h -> .h.gch). Don't check for linker flags in this case. Due
1311 # to our liberal checks for compiler lines, this also reduces the
1312 # number of false positives considerably.
1314 and not extension_found(\%extensions_object, @extensions)) {
1319 my $compile_cpp = 0;
1320 my $restore_cflags = 0;
1321 # Assume CXXFLAGS are required when a C++ file is specified in the
1324 and extension_found(\%extensions_compile_cpp, @extensions)) {
1327 # Ada needs special CFLAGS, use them if only ada files are compiled.
1329 and extension_found(\%extensions_ada, @extensions)) {
1330 $restore_cflags = 1;
1331 $preprocess = 0; # Ada uses no CPPFLAGS
1332 @cflags_backup = @cflags;
1333 @cflags = @cflags_noformat;
1336 and extension_found(\%extensions_fortran, @extensions)) {
1337 $restore_cflags = 1;
1338 @cflags_backup = @cflags;
1339 @cflags = @cflags_noformat;
1342 if ($option_buildd) {
1343 $statistics{preprocess}++ if $preprocess;
1344 $statistics{compile}++ if $compile;
1345 $statistics{compile_cpp}++ if $compile_cpp;
1346 $statistics{link}++ if $link;
1349 # Check if there are flags indicating a debug build. If that's true,
1350 # skip the check for -O2. This prevents fortification, but that's fine
1351 # for a debug build.
1352 if (any_flags_used($line, @def_cflags_debug)) {
1353 remove_flags([\@cflags], \%flag_renames, $def_cflags[1]);
1354 remove_flags([\@cppflags], \%flag_renames, $def_cppflags_fortify[0]);
1357 # Check hardening flags.
1359 if ($compile and not all_flags_used($line, \@missing, @cflags)
1360 # Libraries linked with -fPIC don't have to (and can't) be
1361 # linked with -fPIE as well. It's no error if only PIE flags
1363 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1364 # Assume dpkg-buildflags returns the correct flags.
1365 and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
1366 if (not $option_buildd) {
1367 error_flags('CFLAGS missing', \@missing, \%flag_renames,
1368 $input[$i], $input_number[$i]);
1369 $exit |= $exit_code{flags_missing};
1371 $statistics{compile_missing}++;
1373 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
1374 # Libraries linked with -fPIC don't have to (and can't) be
1375 # linked with -fPIE as well. It's no error if only PIE flags
1377 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1378 # Assume dpkg-buildflags returns the correct flags.
1379 and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
1380 if (not $option_buildd) {
1381 error_flags('CXXFLAGS missing', \@missing, \%flag_renames,
1382 $input[$i], $input_number[$i]);
1383 $exit |= $exit_code{flags_missing};
1385 $statistics{compile_cpp_missing}++;
1389 and (not all_flags_used($line, \@missing, @cppflags)
1390 # The fortify flag might be overwritten, detect that.
1392 and cppflags_fortify_broken($line, \@missing)))
1393 # Assume dpkg-buildflags returns the correct flags.
1394 and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
1395 if (not $option_buildd) {
1396 error_flags('CPPFLAGS missing', \@missing, \%flag_renames,
1397 $input[$i], $input_number[$i]);
1398 $exit |= $exit_code{flags_missing};
1400 $statistics{preprocess_missing}++;
1403 if ($link and not all_flags_used($line, \@missing, @ldflags)
1404 # Same here, -fPIC conflicts with -fPIE.
1405 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
1406 # Assume dpkg-buildflags returns the correct flags.
1407 and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
1408 if (not $option_buildd) {
1409 error_flags('LDFLAGS missing', \@missing, \%flag_renames,
1410 $input[$i], $input_number[$i]);
1411 $exit |= $exit_code{flags_missing};
1413 $statistics{link_missing}++;
1417 # Restore normal CFLAGS.
1418 if ($restore_cflags) {
1419 @cflags = @cflags_backup;
1424 # Print statistics for buildd mode, only output in this mode.
1425 if ($option_buildd) {
1428 if ($statistics{preprocess_missing}) {
1429 push @warning, sprintf 'CPPFLAGS %d (of %d)',
1430 $statistics{preprocess_missing},
1431 $statistics{preprocess};
1433 if ($statistics{compile_missing}) {
1434 push @warning, sprintf 'CFLAGS %d (of %d)',
1435 $statistics{compile_missing},
1436 $statistics{compile};
1438 if ($statistics{compile_cpp_missing}) {
1439 push @warning, sprintf 'CXXFLAGS %d (of %d)',
1440 $statistics{compile_cpp_missing},
1441 $statistics{compile_cpp};
1443 if ($statistics{link_missing}) {
1444 push @warning, sprintf 'LDFLAGS %d (of %d)',
1445 $statistics{link_missing},
1448 if (scalar @warning) {
1449 local $" = ', '; # array join string
1450 print "$buildd_tag{flags_missing}|@warning missing|\n";
1453 if ($statistics{commands_nonverbose}) {
1454 printf "$buildd_tag{non_verbose_build}|%d (of %d) hidden|\n",
1455 $statistics{commands_nonverbose},
1456 $statistics{commands},
1468 blhc - build log hardening check, checks build logs for missing hardening flags
1472 B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>
1476 blhc is a small tool which checks build logs for missing hardening flags. It's
1477 licensed under the GPL 3 or later.
1479 It's designed to check build logs generated by Debian's dpkg-buildpackage (or
1480 tools using dpkg-buildpackage like pbuilder or sbuild (which is used for the
1481 official buildd build logs)) to help maintainers detect missing hardening
1482 flags in their packages.
1484 Only gcc is detected as compiler at the moment. If other compilers support
1485 hardening flags as well, please report them.
1487 If there's no output, no flags are missing and the build log is fine.
1489 See F<README> for details about performed checks, auto-detection and
1498 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
1501 =item B<--arch> I<architecture>
1503 Set the specific architecture (e.g. amd64, armel, etc.), automatically
1504 disables hardening flags not available on this architecture. Is detected
1505 automatically if dpkg-buildpackage is used.
1509 Force check for all +bindnow hardening flags. By default it's auto detected.
1513 Special mode for buildds when automatically parsing log files. The following
1514 changes are in effect:
1520 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1525 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1530 Don't require Term::ANSIColor.
1534 Return exit code 0, unless there was a error (-I, -W messages don't count as
1541 Apply Debian-specific settings. At the moment this only disables checking for
1542 PIE which is automatically applied by Debian's GCC and no longer requires a
1543 compiler command line argument.
1547 Use colored (ANSI) output for warning messages.
1549 =item B<--line-numbers>
1551 Display line numbers.
1553 =item B<--ignore-arch> I<arch>
1555 Ignore build logs from architectures matching I<arch>. I<arch> is a string.
1557 Used to prevent false positives. This option can be specified multiple times.
1559 =item B<--ignore-arch-flag> I<arch>:I<flag>
1561 Like B<--ignore-flag>, but only ignore flag on I<arch>.
1563 =item B<--ignore-arch-line> I<arch>:I<line>
1565 Like B<--ignore-line>, but only ignore line on I<arch>.
1567 =item B<--ignore-flag> I<flag>
1569 Don't print an error when the specific flag is missing in a compiler line.
1570 I<flag> is a string.
1572 Used to prevent false positives. This option can be specified multiple times.
1574 =item B<--ignore-line> I<regex>
1576 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1577 at the beginning and end of the line to prevent false negatives.
1579 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1580 warnings (which have line continuation resolved).
1582 Used to prevent false positives. This option can be specified multiple times.
1586 Force check for all +pie hardening flags. By default it's auto detected.
1588 =item B<-h -? --help>
1590 Print available options.
1594 Print version number and license.
1598 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1599 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1600 all other commands as well.
1604 Normal usage, parse a single log file.
1606 blhc path/to/log/file
1608 If there's no output, no flags are missing and the build log is fine.
1610 Parse multiple log files. The exit code is ORed over all files.
1612 blhc path/to/directory/with/log/files/*
1614 Don't treat missing C<-g> as error:
1616 blhc --ignore-flag -g path/to/log/file
1618 Don't treat missing C<-pie> on kfreebsd-amd64 as error:
1620 blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
1622 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1625 blhc --ignore-line '\./script gcc file' path/to/log/file
1627 Ignore lines matching C<./script gcc file> somewhere in the line.
1629 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1631 Use blhc with pbuilder.
1633 pbuilder path/to/package.dsc | tee path/log/file
1634 blhc path/to/file || echo flags missing
1636 Assume this build log was created on a Debian system and thus don't warn about
1637 missing PIE flags if the current architecture injects them automatically (this
1638 is enabled in buildd mode per default). C<--arch> is necessary if the build
1639 log contains no architecture information as written by dpkg-buildpackage.
1641 blhc --debian --all --arch=amd64 path/to/log/file
1645 The following tags are used in I<--buildd> mode. In braces the additional data
1650 =item B<I-hardening-wrapper-used>
1652 The package uses hardening-wrapper which intercepts calls to gcc and adds
1653 hardening flags. The build log doesn't contain any hardening flags and thus
1654 can't be checked by blhc.
1656 =item B<W-compiler-flags-hidden> (summary of hidden lines)
1658 Build log contains lines which hide the real compiler flags. For example:
1665 Most of the time either C<export V=1> or C<export verbose=1> in
1666 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1667 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1668 patched to remove the C<@>s hiding the real compiler commands.
1670 =item B<W-dpkg-buildflags-missing> (summary of missing flags)
1672 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1674 =item B<I-invalid-cmake-used> (version)
1676 By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
1677 patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
1678 patch was rejected by upstream and later reverted in Debian. Thus those two
1679 versions show correct usage of CPPFLAGS even if the package doesn't correctly
1680 handle them (for example by passing them to CFLAGS). To prevent false
1681 negatives just blacklist those two versions.
1683 =item B<I-no-compiler-commands>
1685 No compiler commands were detected. Either the log contains none or they were
1686 not correctly detected by blhc (please report the bug in this case).
1692 The exit status is a "bit mask", each listed status is ORed when the error
1693 condition occurs to get the result.
1703 No compiler commands were found.
1707 Invalid arguments/options given to blhc.
1715 Missing hardening flags.
1719 Hardening wrapper detected, no tests performed.
1723 Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
1724 TAGS"> for a detailed explanation.
1730 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1732 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1733 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1735 =head1 LICENSE AND COPYRIGHT
1737 Copyright (C) 2012-2018 by Simon Ruderich
1739 This program is free software: you can redistribute it and/or modify
1740 it under the terms of the GNU General Public License as published by
1741 the Free Software Foundation, either version 3 of the License, or
1742 (at your option) any later version.
1744 This program is distributed in the hope that it will be useful,
1745 but WITHOUT ANY WARRANTY; without even the implied warranty of
1746 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1747 GNU General Public License for more details.
1749 You should have received a copy of the GNU General Public License
1750 along with this program. If not, see <http://www.gnu.org/licenses/>.
1754 L<hardening-check(1)>, L<dpkg-buildflags(1)>