3 # Build log hardening check, checks build logs for missing hardening flags.
5 # Copyright (C) 2012-2019 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 = '0.09';
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 = (
225 '-fstack-protector', # keep first, used by cflags_stack_broken()
226 '--param[= ]ssp-buffer-size=4',
228 my @def_cflags_stack_strong = (
229 '-fstack-protector-strong', # keep first, used by cflags_stack_broken()
231 my @def_cflags_stack_bad = (
232 # Blacklist all stack protector options for simplicity.
233 '-fno-stack-protector',
234 '-fno-stack-protector-all',
235 '-fno-stack-protector-strong',
237 my @def_cflags_pie = (
243 # @def_cxxflags_* is the same as @def_cflags_*.
244 my @def_cppflags = ();
245 my @def_cppflags_fortify = (
246 '-D_FORTIFY_SOURCE=2', # must be first, see cppflags_fortify_broken()
247 # If you add another flag fix hack below (search for "Hack to fix") and
248 # $def_cppflags_fortify[0].
250 my @def_cppflags_fortify_bad = (
251 # These flags may overwrite -D_FORTIFY_SOURCE=2.
253 '-D_FORTIFY_SOURCE=0',
254 '-D_FORTIFY_SOURCE=1',
256 my @def_ldflags = ();
257 my @def_ldflags_relro = (
260 my @def_ldflags_bindnow = (
263 my @def_ldflags_pie = (
267 my @def_ldflags_pic = (
272 # References to all flags checked by the flag checker.
276 \@def_cflags_fortify,
278 \@def_cflags_stack_strong,
279 \@def_cflags_stack_bad,
283 \@def_cppflags_fortify,
286 \@def_ldflags_bindnow,
289 # References to all used flags.
290 my @flag_refs_all = (
293 \@def_cppflags_fortify_bad,
296 # Renaming rules for the output so the regex parts are not visible. Also
297 # stores string values of flag regexps above, see compile_flag_regexp().
299 '-O(?:2|3)' => '-O2',
300 '-Wformat(?:=2)?' => '-Wformat',
301 '--param[= ]ssp-buffer-size=4' => '--param=ssp-buffer-size=4',
302 '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
303 '-Wl,(?:-z,)?now' => '-Wl,-z,now',
307 no_compiler_commands => 1 << 0,
308 # used by POD::Usage => 1 << 1,
309 non_verbose_build => 1 << 2,
310 flags_missing => 1 << 3,
311 hardening_wrapper => 1 << 4,
312 invalid_cmake => 1 << 5,
316 no_compiler_commands => 'I-no-compiler-commands',
317 non_verbose_build => 'W-compiler-flags-hidden',
318 flags_missing => 'W-dpkg-buildflags-missing',
319 hardening_wrapper => 'I-hardening-wrapper-used',
320 invalid_cmake => 'I-invalid-cmake-used',
323 # Statistics of missing flags and non-verbose build commands. Used for
327 preprocess_missing => 0,
329 compile_missing => 0,
331 compile_cpp_missing => 0,
335 commands_nonverbose => 0,
338 # Use colored (ANSI) output?
344 # Only works for single-level arrays with no undef values. Thanks to perlfaq4.
346 my ($first_ref, $second_ref) = @_;
348 return 0 if scalar @{$first_ref} != scalar @{$second_ref};
350 my $length = scalar @{$first_ref};
351 for (my $i = 0; $i < $length; $i++) {
352 return 0 if $first_ref->[$i] ne $second_ref->[$i];
359 my ($message, $missing_flags_ref, $flag_renames_ref, $line, $number) = @_;
361 # Get string value of qr//-escaped regexps and if requested rename them.
362 my @missing_flags = map {
363 $flag_renames_ref->{$_}
364 } @{$missing_flags_ref};
366 my $flags = join ' ', @missing_flags;
367 printf '%d:', $number if defined $number;
368 printf '%s (%s)%s %s',
369 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
374 sub error_non_verbose_build {
375 my ($line, $number) = @_;
377 printf '%d:', $number if defined $number;
379 error_color('NONVERBOSE BUILD', 'red'),
380 error_color(':', 'yellow'),
385 sub error_invalid_cmake {
389 error_color('INVALID CMAKE', 'red'),
390 error_color(':', 'yellow'),
395 sub error_hardening_wrapper {
397 error_color('HARDENING WRAPPER', 'red'),
398 error_color(':', 'yellow'),
399 'no checks possible, aborting';
404 my ($message, $color) = @_;
407 return Term::ANSIColor::colored($message, $color);
414 my ($line, @flags) = @_;
416 foreach my $flag (@flags) {
417 return 1 if $line =~ /$flag/;
423 my ($line, $missing_flags_ref, @flags) = @_;
425 my @missing_flags = ();
426 foreach my $flag (@flags) {
427 if (not $line =~ /$flag/) {
428 push @missing_flags, $flag;
432 return 1 if scalar @missing_flags == 0;
434 @{$missing_flags_ref} = @missing_flags;
437 # Check if any of \@bad_flags occurs after $good_flag. Doesn't check if
438 # $good_flag is present.
439 sub flag_overwritten {
440 my ($line, $good_flag, $bad_flags) = @_;
442 if (not any_flags_used($line, @{$bad_flags})) {
447 foreach my $flag (@{$bad_flags}) {
448 while ($line =~ /$flag/g) {
449 if ($bad_pos < $+[0]) {
455 while ($line =~ /$good_flag/g) {
458 if ($good_pos > $bad_pos) {
464 sub cppflags_fortify_broken {
465 my ($line, $missing_flags) = @_;
467 # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
468 my $fortify_source = $def_cppflags_fortify[0];
470 # Some build systems enable/disable fortify source multiple times, check
472 if (not flag_overwritten($line,
474 \@def_cppflags_fortify_bad)) {
477 push @{$missing_flags}, $fortify_source;
481 sub cflags_stack_broken {
482 my ($line, $missing_flags, $strong) = @_;
484 my $flag = $strong ? $def_cflags_stack_strong[0]
485 : $def_cflags_stack[0];
487 if (not flag_overwritten($line, $flag, \@def_cflags_stack_bad)) {
490 push @{$missing_flags}, $flag;
494 # Modifies $missing_flags_ref array.
495 sub pic_pie_conflict {
496 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
498 return 0 if not $pie;
499 return 0 if not any_flags_used($line, @def_ldflags_pic);
501 my %flags = map { $_ => 1 } @flags_pie;
503 # Remove all PIE flags from @missing_flags as they are not required with
506 not exists $flags{$_}
507 } @{$missing_flags_ref};
508 @{$missing_flags_ref} = @result;
510 # We got a conflict when no flags are left, thus only PIE flags were
511 # missing. If other flags were missing abort because the conflict is not
513 return scalar @result == 0;
516 sub is_non_verbose_build {
517 my ($line, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
519 if ($line =~ /$libtool_regex/o) {
520 # libtool's --silent hides the real compiler flags.
521 if ($line =~ /\s--silent/) {
523 # If --silent is not present, skip this line as some compiler flags
524 # might be missing (e.g. -fPIE) which are handled correctly by libtool
525 # internally. libtool displays the real compiler command on the next
526 # line, so the flags are checked as usual.
533 if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
534 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
535 or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
536 or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
537 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
543 # C++ compiler setting.
544 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
545 return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
546 # "Compiling" non binary files.
547 return 0 if $line =~ /^\s*Compiling \S+\.(?:py|el)['"]?\s*(?:\.\.\.)?$/;
548 return 0 if $line =~ /^\s*[Cc]ompiling catalog \S+\.po\b/;
549 # "Compiling" with no file name.
550 if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
551 # $file_extension_regex may need spaces around the filename.
552 return 0 if not " $1 " =~ /$file_extension_regex/o;
557 # On the first pass we only check if this line is verbose or not.
558 return 1 if not defined $input_ref;
560 # Second pass, we have access to the next lines.
563 # CMake and other build systems print the non-verbose messages also when
564 # building verbose. If a compiler and the file name occurs in the next
565 # lines, treat it as verbose build.
567 # Get filename, we can't use the complete path as only parts of it are
568 # used in the real compiler command.
569 $file =~ m{/([^/\s]+)$};
572 for (my $i = 1; $i <= $line_count; $i++) {
573 my $next_line = $input_ref->[$line_offset + $i];
574 last unless defined $next_line;
576 if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
577 # Not a non-verbose line, but we still have to skip the
578 # current line as it doesn't contain any compiler commands.
588 # Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
590 my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
592 my %removes = map { $_ => 1 } @flags;
593 foreach my $flags (@{$flag_refs_ref}) {
595 # Flag found as string.
596 not exists $removes{$_}
597 # Flag found as string representation of regexp.
598 and (not defined $flag_renames_ref->{$_}
599 or not exists $removes{$flag_renames_ref->{$_}})
606 # Modifies $flag_renames_ref hash.
607 sub compile_flag_regexp {
608 my ($flag_renames_ref, @flags) = @_;
611 foreach my $flag (@flags) {
612 # Compile flag regexp for faster execution.
613 my $regex = qr/\s$flag(?:\s|\\)/;
615 # Store flag name in replacement string for correct flags in messages
616 # with qr//ed flag regexps.
617 $flag_renames_ref->{$regex}
618 = (exists $flag_renames_ref->{$flag})
619 ? $flag_renames_ref->{$flag}
622 push @result, $regex;
627 # Does any extension in @extensions exist in %{$extensions_ref}?
628 sub extension_found {
629 my ($extensions_ref, @extensions) = @_;
631 foreach my $extension (@extensions) {
632 if (exists $extensions_ref->{$extension}) {
642 # Parse command line arguments.
644 my $option_version = 0;
646 my $option_bindnow = 0;
647 my @option_ignore_arch = ();
648 my @option_ignore_flag = ();
649 my @option_ignore_arch_flag = ();
650 my @option_ignore_line = ();
651 my @option_ignore_arch_line = ();
653 my $option_arch = undef;
654 my $option_buildd = 0;
655 my $option_debian = 0;
657 my $option_line_numbers = 0;
658 if (not Getopt::Long::GetOptions(
659 'help|h|?' => \$option_help,
660 'version' => \$option_version,
662 'pie' => \$option_pie,
663 'bindnow' => \$option_bindnow,
664 'all' => \$option_all,
666 'ignore-arch=s' => \@option_ignore_arch,
667 'ignore-flag=s' => \@option_ignore_flag,
668 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
669 'ignore-line=s' => \@option_ignore_line,
670 'ignore-arch-line=s' => \@option_ignore_arch_line,
672 'color' => \$option_color,
673 'arch=s' => \$option_arch,
674 'buildd' => \$option_buildd,
675 'debian' => \$option_debian,
676 'line-numbers' => \$option_line_numbers,
679 Pod::Usage::pod2usage(2);
683 Pod::Usage::pod2usage(1);
685 if ($option_version) {
687 blhc $VERSION Copyright (C) 2012-2019 Simon Ruderich
689 This program is free software: you can redistribute it and/or modify
690 it under the terms of the GNU General Public License as published by
691 the Free Software Foundation, either version 3 of the License, or
692 (at your option) any later version.
694 This program is distributed in the hope that it will be useful,
695 but WITHOUT ANY WARRANTY; without even the implied warranty of
696 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
697 GNU General Public License for more details.
699 You should have received a copy of the GNU General Public License
700 along with this program. If not, see <http://www.gnu.org/licenses/>.
706 if (scalar @ARGV == 0) {
708 Pod::Usage::pod2usage(2);
711 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
712 # installed on Debian's buildds.
713 if (not $option_buildd) {
714 require Term::ANSIColor;
722 # Precompiled ignores for faster lookup.
723 my %option_ignore_arch_flag = ();
724 my %option_ignore_arch_line = ();
726 # Strip flags which should be ignored.
727 if (scalar @option_ignore_flag > 0) {
728 remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
730 # Same for arch specific ignore flags, but only prepare here.
731 if (scalar @option_ignore_arch_flag > 0) {
732 foreach my $ignore (@option_ignore_arch_flag) {
733 my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
735 if (not $ignore_arch or not $ignore_flag) {
736 printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
737 . '("arch:flag" expected)' . "\n", $ignore;
739 Pod::Usage::pod2usage(2);
742 push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
746 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
748 foreach my $flags (@flag_refs_all) {
749 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
752 # Precompile ignore line regexps, also anchor at beginning and end of line.
753 foreach my $ignore (@option_ignore_line) {
754 $ignore = qr/^$ignore$/;
756 # Same for arch specific ignore lines.
757 if (scalar @option_ignore_arch_line > 0) {
758 foreach my $ignore (@option_ignore_arch_line) {
759 my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
761 if (not $ignore_arch or not $ignore_line) {
762 printf STDERR 'Value "%s" invalid for option ignore-arch-line '
763 . '("arch:line" expected)' . "\n", $ignore;
765 Pod::Usage::pod2usage(2);
768 push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
776 foreach my $file (@ARGV) {
777 print "checking '$file'...\n" if scalar @ARGV > 1;
779 -f $file or die "No such file: $file";
781 open my $fh, '<', $file or die $!;
783 # Architecture of this file.
784 my $arch = $option_arch;
786 # Hardening options. Not all architectures support all hardening options.
787 my $harden_format = 1;
788 my $harden_fortify = 1;
789 my $harden_stack = 1;
790 my $harden_stack_strong = 1;
791 my $harden_relro = 1;
792 my $harden_bindnow = $option_bindnow; # defaults to 0
793 my $harden_pie = $option_pie; # defaults to 0
795 # Does this build log use ada? Ada also uses gcc as compiler but uses
796 # different CFLAGS. But only perform ada checks if an ada compiler is used
797 # for performance reasons.
799 # Fortran also requires different CFLAGS.
802 # Number of parallel jobs to prevent false positives when detecting
803 # non-verbose builds. As not all jobs declare the number of parallel jobs
804 # use a large enough default.
807 # Don't check for PIE flags if automatically applied by the compiler. Only
808 # used in buildd and Debian mode.
809 my $disable_harden_pie = 0;
810 if ($option_debian) {
811 $disable_harden_pie = 1;
815 while (my $line = <$fh>) {
818 # Detect architecture automatically unless overridden. For buildd logs
819 # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
820 # build logs which aren't built (wrong architecture, build error,
823 if (index($line, 'Build Architecture: ') == 0) {
824 $arch = substr $line, 20, -1; # -1 to ignore '\n' at the end
825 # For old logs (sbuild << 0.63.0-1).
826 } elsif (index($line, 'Architecture: ') == 0) {
827 $arch = substr $line, 14, -1; # -1 to ignore '\n' at the end
831 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
832 # check for hardening flags in buildd mode if an older dpkg-dev is
833 # used. Default flags (-g -O2) are still checked.
835 # Packages which were built before 1.16.1 but used their own hardening
836 # flags are not checked.
838 # Strong stack protector is used since dpkg 1.17.11.
840 # Recent GCC versions automatically use PIE (only on supported
841 # architectures) and dpkg respects this properly since 1.18.15 and
842 # doesn't pass PIE flags manually.
844 and index($line, 'Toolchain package versions: ') == 0) {
845 require Dpkg::Version;
848 my $disable_strong = 1;
850 if ($line =~ /\bdpkg-dev_(\S+)/) {
851 if (Dpkg::Version::version_compare($1, '1.16.1') >= 0) {
854 if (Dpkg::Version::version_compare($1, '1.17.11') >= 0) {
857 if (Dpkg::Version::version_compare($1, '1.18.15') >= 0) {
858 $disable_harden_pie = 1;
870 if ($disable_strong) {
871 $harden_stack_strong = 0;
875 # The following two versions of CMake in Debian obeyed CPPFLAGS, but
876 # this was later dropped because upstream rejected the patch. Thus
877 # build logs with these versions will have fortify hardening flags
878 # enabled, even though they may be not correctly set and are missing
879 # when build with later CMake versions. Thanks to Aron Xu for letting
881 if (index($line, 'Package versions: ') == 0
882 and $line =~ /\bcmake_(\S+)/
883 and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
884 if (not $option_buildd) {
885 error_invalid_cmake($1);
886 $exit |= $exit_code{invalid_cmake};
888 print "$buildd_tag{invalid_cmake}|$1|\n";
892 # Debian's build daemons use "Filtered Build-Depends:" (or just
893 # "Build-Depends:" in older versions) for the build dependencies, but
894 # pbuilder uses "Depends:"; support both.
895 if (index($line, 'Filtered Build-Depends: ') == 0
896 or index($line, 'Build-Depends: ') == 0
897 or index($line, 'Depends: ') == 0) {
898 # If hardening wrapper is used (wraps calls to gcc and adds
899 # hardening flags automatically) we can't perform any checks,
901 if ($line =~ /\bhardening-wrapper\b/) {
902 if (not $option_buildd) {
903 error_hardening_wrapper();
904 $exit |= $exit_code{hardening_wrapper};
906 print "$buildd_tag{hardening_wrapper}||\n";
912 if ($line =~ /\bgnat\b/) {
916 if ($line =~ /\bgfortran\b/) {
921 # This flags is not always available, but if it is use it.
922 if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
926 # We skip over unimportant lines at the beginning of the log to
927 # prevent false positives.
928 last if index($line, 'dpkg-buildpackage: ') == 0;
931 # Input lines, contain only the lines with compiler commands.
933 # Non-verbose lines in the input. Used to reduce calls to
934 # is_non_verbose_build() (which is quite slow) in the second loop when
935 # it's already clear if a line is non-verbose or not.
936 my @input_nonverbose = ();
938 my @input_number = ();
940 my $continuation = 0;
941 my $complete_line = undef;
943 while (my $line = <$fh>) {
946 # And stop at the end of the build log. Package details (reported by
947 # the buildd logs) are not important for us. This also prevents false
949 last if index($line, 'Build finished at ') == 0
950 and $line =~ /^Build finished at \d{8}-\d{4}$/;
952 if (not $continuation) {
956 # Detect architecture automatically unless overridden.
958 and index($line, 'dpkg-buildpackage: info: host architecture ') == 0) {
959 $arch = substr $line, 43, -1; # -1 to ignore '\n' at the end
960 # Older versions of dpkg-buildpackage
962 and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
963 $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
965 # Old buildd logs use e.g. "host architecture is alpha", remove
966 # the "is", otherwise debarch_to_debtriplet() will not detect the
968 if (index($arch, 'is ') == 0) {
969 $arch = substr $arch, 3;
973 next if $line =~ /^\s*#/;
974 # Ignore compiler warnings for now.
975 next if $line =~ /$warning_regex/o;
977 if (not $option_buildd and index($line, "\033") != -1) { # \033 = esc
978 # Remove all ANSI color sequences which are sometimes used in
979 # non-verbose builds.
980 $line = Term::ANSIColor::colorstrip($line);
981 # Also strip '\0xf' (delete previous character), used by Elinks'
984 # And "ESC(B" which seems to be used on armhf and hurd (not sure
986 $line =~ s/\033\(B//g;
989 # Check if this line indicates a non verbose build.
991 $non_verbose |= is_non_verbose_build($line, \$skip);
994 # One line may contain multiple commands (";"). Treat each one as
995 # single line. parse_line() is slow, only use it when necessary.
996 my @line = (index($line, ';') == -1)
999 # Ensure newline at the line end - necessary for
1000 # correct parsing later.
1003 } Text::ParseWords::parse_line(';', 1, $line);
1004 foreach my $line (@line) {
1005 if ($continuation) {
1008 # Join lines, but leave the "\" in place so it's clear where
1009 # the original line break was.
1010 chomp $complete_line;
1011 $complete_line .= ' ' . $line;
1013 # Line continuation, line ends with "\".
1014 if ($line =~ /\\$/) {
1016 # Start line continuation.
1017 if (not defined $complete_line) {
1018 $complete_line = $line;
1023 # Use the complete line if a line continuation occurred.
1024 if (defined $complete_line) {
1025 $line = $complete_line;
1026 $complete_line = undef;
1029 # Ignore lines with no compiler commands.
1030 next if not $non_verbose
1031 and not $line =~ /$cc_regex_normal/o;
1032 # Ignore lines with no filenames with extensions. May miss some
1033 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
1034 # a problem as the log will most likely contain other non-verbose
1035 # commands which are detected.
1036 next if not $non_verbose
1037 and not $line =~ /$file_extension_regex/o;
1039 # Ignore false positives.
1041 # `./configure` output.
1042 next if not $non_verbose
1043 and $line =~ /^(?:checking|[Cc]onfigure:) /;
1044 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
1045 [Cc]ompiler[\s.]*:?\s+
1047 next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
1048 \s*=\s*$cc_regex_full
1049 # optional compiler options, don't allow
1050 # "everything" here to prevent false negatives
1051 \s*(?:\s-\S+)*\s*$}xo;
1052 # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
1053 # line (or similar for other architectures) which gets recognized
1054 # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
1055 # C++ files. No hardening flags are relevant during this step,
1056 # thus ignore `moc-qt*` lines. The resulting files will be
1057 # compiled in a separate step (and therefore checked).
1058 next if $line =~ m{^\S+/bin/moc(?:-qt[45])?
1060 -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
1062 # Ignore false positives when the line contains only CC=gcc but no
1063 # other gcc command.
1064 if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
1067 next if not $before =~ /$cc_regex_normal/o
1068 and not $after =~ /$cc_regex_normal/o;
1070 # Ignore false positives caused by gcc -v. It outputs a line
1071 # looking like a normal compiler line but which is sometimes
1072 # missing hardening flags, although the normal compiler line
1074 next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
1075 [0-9.]+/cc1(?:plus)?}xo;
1076 # Ignore false positive with `rm` which may remove files which
1077 # look like a compiler executable thus causing the line to be
1078 # treated as a normal compiler line.
1079 next if $line =~ m{^\s*rm\s+};
1080 # Some build systems emit "gcc > file".
1081 next if $line =~ m{$cc_regex_normal\s*>\s*\S+}o;
1082 # Hex output may contain "cc".
1083 next if $line =~ m#(?:\b[0-9a-fA-F]{2,}\b\s*){5}#;
1085 # Check if additional hardening options were used. Used to ensure
1086 # they are used for the complete build.
1087 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie,
1089 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
1092 push @input_nonverbose, $non_verbose;
1093 push @input_number, $number if $option_line_numbers;
1097 close $fh or die $!;
1099 # Ignore arch if requested.
1100 if (scalar @option_ignore_arch > 0 and $arch) {
1101 foreach my $ignore (@option_ignore_arch) {
1102 if ($arch eq $ignore) {
1103 print "ignoring architecture '$arch'\n";
1109 if (scalar @input == 0) {
1110 if (not $option_buildd) {
1111 print "No compiler commands!\n";
1112 $exit |= $exit_code{no_compiler_commands};
1114 print "$buildd_tag{no_compiler_commands}||\n";
1119 if ($option_buildd) {
1120 $statistics{commands} += scalar @input;
1123 # Option or auto detected.
1125 # The following was partially copied from dpkg-dev 1.19.7
1126 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, _add_build_flags()),
1127 # copyright Raphaël Hertzog <hertzog@debian.org>, Guillem Jover
1128 # <guillem@debian.org>, Kees Cook <kees@debian.org>, Canonical, Ltd.
1129 # licensed under GPL version 2 or later. Keep it in sync.
1133 # Recent dpkg versions use a quadruplet for arch. Support both.
1135 (undef, undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
1138 (undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
1141 my %builtin_pie_arch = map { $_ => 1 } qw(
1162 # Disable unsupported hardening options.
1163 if ($os !~ /^(?:linux|kfreebsd|knetbsd|hurd)$/
1164 or $cpu =~ /^(?:hppa|avr32)$/) {
1167 if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
1169 $harden_stack_strong = 0;
1171 if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
1173 $harden_bindnow = 0;
1176 if ($disable_harden_pie and exists $builtin_pie_arch{$arch}) {
1182 my @cflags = @def_cflags;
1183 my @cxxflags = @def_cxxflags;
1184 my @cppflags = @def_cppflags;
1185 my @ldflags = @def_ldflags;
1186 # Check the specified hardening options, same order as dpkg-buildflags.
1188 @cflags = (@cflags, @def_cflags_pie);
1189 @cxxflags = (@cxxflags, @def_cflags_pie);
1190 @ldflags = (@ldflags, @def_ldflags_pie);
1192 if ($harden_stack_strong) {
1193 @cflags = (@cflags, @def_cflags_stack_strong);
1194 @cxxflags = (@cxxflags, @def_cflags_stack_strong);
1195 } elsif ($harden_stack) {
1196 @cflags = (@cflags, @def_cflags_stack);
1197 @cxxflags = (@cxxflags, @def_cflags_stack);
1199 if ($harden_fortify) {
1200 @cflags = (@cflags, @def_cflags_fortify);
1201 @cxxflags = (@cxxflags, @def_cflags_fortify);
1202 @cppflags = (@cppflags, @def_cppflags_fortify);
1204 if ($harden_format) {
1205 @cflags = (@cflags, @def_cflags_format);
1206 @cxxflags = (@cxxflags, @def_cflags_format);
1208 if ($harden_relro) {
1209 @ldflags = (@ldflags, @def_ldflags_relro);
1211 if ($harden_bindnow) {
1212 @ldflags = (@ldflags, @def_ldflags_bindnow);
1215 # Ada doesn't support format hardening flags, see #680117 for more
1216 # information. Same for fortran. Filter them out if either language is
1219 my @cflags_noformat;
1220 if (($ada or $fortran) and $harden_format) {
1221 @cflags_noformat = grep {
1223 foreach my $flag (@def_cflags_format) {
1224 $ok = 0 if $_ eq $flag;
1230 # Hack to fix cppflags_fortify_broken() if --ignore-flag
1231 # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
1232 # as long as @def_cppflags_fortify contains only one variable.
1233 if (scalar @def_cppflags_fortify == 0) {
1234 $harden_fortify = 0;
1237 # Ignore flags for this arch if requested.
1238 if ($arch and exists $option_ignore_arch_flag{$arch}) {
1239 my @local_flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
1241 remove_flags(\@local_flag_refs,
1243 @{$option_ignore_arch_flag{$arch}});
1246 my @ignore_line = @option_ignore_line;
1247 # Ignore lines for this arch if requested.
1248 if ($arch and exists $option_ignore_arch_line{$arch}) {
1249 @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
1253 for (my $i = 0; $i < scalar @input; $i++) {
1254 my $line = $input[$i];
1256 # Ignore line if requested.
1257 foreach my $ignore (@ignore_line) {
1258 next LINE if $line =~ /$ignore/;
1262 if ($input_nonverbose[$i]
1263 and is_non_verbose_build($line, \$skip,
1264 \@input, $i, $parallel)) {
1265 if (not $option_buildd) {
1266 error_non_verbose_build($line, $input_number[$i]);
1267 $exit |= $exit_code{non_verbose_build};
1269 $statistics{commands_nonverbose}++;
1273 # Even if it's a verbose build, we might have to skip this line (see
1274 # is_non_verbose_build()).
1277 my $orig_line = $line;
1279 # Remove everything until and including the compiler command. Makes
1280 # checks easier and faster.
1281 $line =~ s/^.*?$cc_regex//o;
1282 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
1283 # the brace and similar characters at the line end.
1284 $line =~ s/['")]+$//;
1286 # Skip unnecessary tests when only preprocessing.
1287 my $flag_preprocess = 0;
1294 # Preprocess, compile, assemble.
1295 if ($line =~ /\s(-E|-S|-c)\b/) {
1297 $flag_preprocess = 1 if $1 eq '-E';
1298 $compile = 1 if $1 eq '-S' or $1 eq '-c';
1299 # Dependency generation for Makefiles. The other flags (-MF -MG -MP
1300 # -MT -MQ) are always used with -M/-MM.
1301 } elsif ($line =~ /\s(?:-M|-MM)\b/) {
1303 # Otherwise assume we are linking.
1308 # -MD/-MMD also cause dependency generation, but they don't imply -E!
1309 if ($line =~ /\s(?:-MD|-MMD)\b/) {
1311 $flag_preprocess = 0;
1314 # Dependency generation for Makefiles, no preprocessing or other flags
1316 next if $dependency;
1318 # Get all file extensions on this line.
1319 my @extensions = $line =~ /$file_extension_regex/go;
1320 # Ignore all unknown extensions to speedup the search below.
1321 @extensions = grep { exists $extension{$_} } @extensions;
1323 # These file types don't require preprocessing.
1324 if (extension_found(\%extensions_no_preprocess, @extensions)) {
1327 # These file types require preprocessing.
1328 if (extension_found(\%extensions_preprocess, @extensions)) {
1329 # Prevent false positives with "libtool: link: g++ -include test.h
1330 # .." compiler lines.
1331 if ($orig_line !~ /$libtool_link_regex/o) {
1336 if (not $flag_preprocess) {
1337 # If there are source files then it's compiling/linking in one
1338 # step and we must check both. We only check for source files
1339 # here, because header files cause too many false positives.
1340 if (extension_found(\%extensions_compile_link, @extensions)) {
1341 # Assembly files don't need CFLAGS.
1342 if (not extension_found(\%extensions_compile, @extensions)
1343 and extension_found(\%extensions_no_compile, @extensions)) {
1345 # But the rest does.
1349 # No compilable extensions found, either linking or compiling
1352 # If there are also no object files we are just compiling headers
1353 # (.h -> .h.gch). Don't check for linker flags in this case. Due
1354 # to our liberal checks for compiler lines, this also reduces the
1355 # number of false positives considerably.
1357 and not extension_found(\%extensions_object, @extensions)) {
1362 my $compile_cpp = 0;
1363 my $restore_cflags = 0;
1364 # Assume CXXFLAGS are required when a C++ file is specified in the
1367 and extension_found(\%extensions_compile_cpp, @extensions)) {
1370 # Ada needs special CFLAGS, use them if only ada files are compiled.
1372 and extension_found(\%extensions_ada, @extensions)) {
1373 $restore_cflags = 1;
1374 $preprocess = 0; # Ada uses no CPPFLAGS
1375 @cflags_backup = @cflags;
1376 @cflags = @cflags_noformat;
1379 and extension_found(\%extensions_fortran, @extensions)) {
1380 $restore_cflags = 1;
1381 @cflags_backup = @cflags;
1382 @cflags = @cflags_noformat;
1385 if ($option_buildd) {
1386 $statistics{preprocess}++ if $preprocess;
1387 $statistics{compile}++ if $compile;
1388 $statistics{compile_cpp}++ if $compile_cpp;
1389 $statistics{link}++ if $link;
1392 # Check if there are flags indicating a debug build. If that's true,
1393 # skip the check for -O2. This prevents fortification, but that's fine
1394 # for a debug build.
1395 if (any_flags_used($line, @def_cflags_debug)) {
1396 remove_flags([\@cflags], \%flag_renames, $def_cflags[1]);
1397 remove_flags([\@cppflags], \%flag_renames, $def_cppflags_fortify[0]);
1400 # Check hardening flags.
1402 if ($compile and (not all_flags_used($line, \@missing, @cflags)
1403 or (($harden_stack or $harden_stack_strong)
1404 and cflags_stack_broken($line, \@missing,
1405 $harden_stack_strong)))
1406 # Libraries linked with -fPIC don't have to (and can't) be
1407 # linked with -fPIE as well. It's no error if only PIE flags
1409 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1410 # Assume dpkg-buildflags returns the correct flags.
1411 and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
1412 if (not $option_buildd) {
1413 error_flags('CFLAGS missing', \@missing, \%flag_renames,
1414 $input[$i], $input_number[$i]);
1415 $exit |= $exit_code{flags_missing};
1417 $statistics{compile_missing}++;
1419 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
1420 # Libraries linked with -fPIC don't have to (and can't) be
1421 # linked with -fPIE as well. It's no error if only PIE flags
1423 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1424 # Assume dpkg-buildflags returns the correct flags.
1425 and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
1426 if (not $option_buildd) {
1427 error_flags('CXXFLAGS missing', \@missing, \%flag_renames,
1428 $input[$i], $input_number[$i]);
1429 $exit |= $exit_code{flags_missing};
1431 $statistics{compile_cpp_missing}++;
1435 and (not all_flags_used($line, \@missing, @cppflags)
1436 # The fortify flag might be overwritten, detect that.
1438 and cppflags_fortify_broken($line, \@missing)))
1439 # Assume dpkg-buildflags returns the correct flags.
1440 and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
1441 if (not $option_buildd) {
1442 error_flags('CPPFLAGS missing', \@missing, \%flag_renames,
1443 $input[$i], $input_number[$i]);
1444 $exit |= $exit_code{flags_missing};
1446 $statistics{preprocess_missing}++;
1449 if ($link and not all_flags_used($line, \@missing, @ldflags)
1450 # Same here, -fPIC conflicts with -fPIE.
1451 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
1452 # Assume dpkg-buildflags returns the correct flags.
1453 and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
1454 if (not $option_buildd) {
1455 error_flags('LDFLAGS missing', \@missing, \%flag_renames,
1456 $input[$i], $input_number[$i]);
1457 $exit |= $exit_code{flags_missing};
1459 $statistics{link_missing}++;
1463 # Restore normal CFLAGS.
1464 if ($restore_cflags) {
1465 @cflags = @cflags_backup;
1470 # Print statistics for buildd mode, only output in this mode.
1471 if ($option_buildd) {
1474 if ($statistics{preprocess_missing}) {
1475 push @warning, sprintf 'CPPFLAGS %d (of %d)',
1476 $statistics{preprocess_missing},
1477 $statistics{preprocess};
1479 if ($statistics{compile_missing}) {
1480 push @warning, sprintf 'CFLAGS %d (of %d)',
1481 $statistics{compile_missing},
1482 $statistics{compile};
1484 if ($statistics{compile_cpp_missing}) {
1485 push @warning, sprintf 'CXXFLAGS %d (of %d)',
1486 $statistics{compile_cpp_missing},
1487 $statistics{compile_cpp};
1489 if ($statistics{link_missing}) {
1490 push @warning, sprintf 'LDFLAGS %d (of %d)',
1491 $statistics{link_missing},
1494 if (scalar @warning) {
1495 local $" = ', '; # array join string
1496 print "$buildd_tag{flags_missing}|@warning missing|\n";
1499 if ($statistics{commands_nonverbose}) {
1500 printf "$buildd_tag{non_verbose_build}|%d (of %d) hidden|\n",
1501 $statistics{commands_nonverbose},
1502 $statistics{commands},
1514 blhc - build log hardening check, checks build logs for missing hardening flags
1518 B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>
1522 blhc is a small tool which checks build logs for missing hardening flags. It's
1523 licensed under the GPL 3 or later.
1525 It's designed to check build logs generated by Debian's dpkg-buildpackage (or
1526 tools using dpkg-buildpackage like pbuilder or sbuild (which is used for the
1527 official buildd build logs)) to help maintainers detect missing hardening
1528 flags in their packages.
1530 Only gcc is detected as compiler at the moment. If other compilers support
1531 hardening flags as well, please report them.
1533 If there's no output, no flags are missing and the build log is fine.
1535 See F<README> for details about performed checks, auto-detection and
1544 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
1547 =item B<--arch> I<architecture>
1549 Set the specific architecture (e.g. amd64, armel, etc.), automatically
1550 disables hardening flags not available on this architecture. Is detected
1551 automatically if dpkg-buildpackage is used.
1555 Force check for all +bindnow hardening flags. By default it's auto detected.
1559 Special mode for buildds when automatically parsing log files. The following
1560 changes are in effect:
1566 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1571 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1576 Don't require Term::ANSIColor.
1580 Return exit code 0, unless there was a error (-I, -W messages don't count as
1587 Apply Debian-specific settings. At the moment this only disables checking for
1588 PIE which is automatically applied by Debian's GCC and no longer requires a
1589 compiler command line argument.
1593 Use colored (ANSI) output for warning messages.
1595 =item B<--line-numbers>
1597 Display line numbers.
1599 =item B<--ignore-arch> I<arch>
1601 Ignore build logs from architectures matching I<arch>. I<arch> is a string.
1603 Used to prevent false positives. This option can be specified multiple times.
1605 =item B<--ignore-arch-flag> I<arch>:I<flag>
1607 Like B<--ignore-flag>, but only ignore flag on I<arch>.
1609 =item B<--ignore-arch-line> I<arch>:I<line>
1611 Like B<--ignore-line>, but only ignore line on I<arch>.
1613 =item B<--ignore-flag> I<flag>
1615 Don't print an error when the specific flag is missing in a compiler line.
1616 I<flag> is a string.
1618 Used to prevent false positives. This option can be specified multiple times.
1620 =item B<--ignore-line> I<regex>
1622 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1623 at the beginning and end of the line to prevent false negatives.
1625 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1626 warnings (which have line continuation resolved).
1628 Used to prevent false positives. This option can be specified multiple times.
1632 Force check for all +pie hardening flags. By default it's auto detected.
1634 =item B<-h -? --help>
1636 Print available options.
1640 Print version number and license.
1644 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1645 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1646 all other commands as well.
1650 Normal usage, parse a single log file.
1652 blhc path/to/log/file
1654 If there's no output, no flags are missing and the build log is fine.
1656 Parse multiple log files. The exit code is ORed over all files.
1658 blhc path/to/directory/with/log/files/*
1660 Don't treat missing C<-g> as error:
1662 blhc --ignore-flag -g path/to/log/file
1664 Don't treat missing C<-pie> on kfreebsd-amd64 as error:
1666 blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
1668 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1671 blhc --ignore-line '\./script gcc file' path/to/log/file
1673 Ignore lines matching C<./script gcc file> somewhere in the line.
1675 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1677 Use blhc with pbuilder.
1679 pbuilder path/to/package.dsc | tee path/log/file
1680 blhc path/to/file || echo flags missing
1682 Assume this build log was created on a Debian system and thus don't warn about
1683 missing PIE flags if the current architecture injects them automatically (this
1684 is enabled in buildd mode per default). C<--arch> is necessary if the build
1685 log contains no architecture information as written by dpkg-buildpackage.
1687 blhc --debian --all --arch=amd64 path/to/log/file
1691 The following tags are used in I<--buildd> mode. In braces the additional data
1696 =item B<I-hardening-wrapper-used>
1698 The package uses hardening-wrapper which intercepts calls to gcc and adds
1699 hardening flags. The build log doesn't contain any hardening flags and thus
1700 can't be checked by blhc.
1702 =item B<W-compiler-flags-hidden> (summary of hidden lines)
1704 Build log contains lines which hide the real compiler flags. For example:
1711 Most of the time either C<export V=1> or C<export verbose=1> in
1712 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1713 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1714 patched to remove the C<@>s hiding the real compiler commands.
1716 =item B<W-dpkg-buildflags-missing> (summary of missing flags)
1718 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1720 =item B<I-invalid-cmake-used> (version)
1722 By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
1723 patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
1724 patch was rejected by upstream and later reverted in Debian. Thus those two
1725 versions show correct usage of CPPFLAGS even if the package doesn't correctly
1726 handle them (for example by passing them to CFLAGS). To prevent false
1727 negatives just blacklist those two versions.
1729 =item B<I-no-compiler-commands>
1731 No compiler commands were detected. Either the log contains none or they were
1732 not correctly detected by blhc (please report the bug in this case).
1738 The exit status is a "bit mask", each listed status is ORed when the error
1739 condition occurs to get the result.
1749 No compiler commands were found.
1753 Invalid arguments/options given to blhc.
1761 Missing hardening flags.
1765 Hardening wrapper detected, no tests performed.
1769 Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
1770 TAGS"> for a detailed explanation.
1776 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1778 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1779 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1781 =head1 LICENSE AND COPYRIGHT
1783 Copyright (C) 2012-2019 by Simon Ruderich
1785 This program is free software: you can redistribute it and/or modify
1786 it under the terms of the GNU General Public License as published by
1787 the Free Software Foundation, either version 3 of the License, or
1788 (at your option) any later version.
1790 This program is distributed in the hope that it will be useful,
1791 but WITHOUT ANY WARRANTY; without even the implied warranty of
1792 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1793 GNU General Public License for more details.
1795 You should have received a copy of the GNU General Public License
1796 along with this program. If not, see <http://www.gnu.org/licenses/>.
1800 L<hardening-check(1)>, L<dpkg-buildflags(1)>