3 # Build log hardening check, checks build logs for missing hardening flags.
5 # Copyright (C) 2012-2020 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 = '0.12';
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?
348 foreach my $delim (';', '&&', '||') {
351 push @x, Text::ParseWords::parse_line(qr/\Q$delim\E/, 1, $_);
357 # Ensure newline at the line end - necessary for
358 # correct parsing later.
365 my ($message, $missing_flags_ref, $flag_renames_ref, $line, $number) = @_;
367 # Get string value of qr//-escaped regexps and if requested rename them.
368 my @missing_flags = map {
369 $flag_renames_ref->{$_}
370 } @{$missing_flags_ref};
372 my $flags = join ' ', @missing_flags;
373 printf '%d:', $number if defined $number;
374 printf '%s (%s)%s %s',
375 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
380 sub error_non_verbose_build {
381 my ($line, $number) = @_;
383 printf '%d:', $number if defined $number;
385 error_color('NONVERBOSE BUILD', 'red'),
386 error_color(':', 'yellow'),
391 sub error_invalid_cmake {
395 error_color('INVALID CMAKE', 'red'),
396 error_color(':', 'yellow'),
401 sub error_hardening_wrapper {
403 error_color('HARDENING WRAPPER', 'red'),
404 error_color(':', 'yellow'),
405 'no checks possible, aborting';
410 my ($message, $color) = @_;
413 return Term::ANSIColor::colored($message, $color);
420 my ($line, @flags) = @_;
422 foreach my $flag (@flags) {
423 return 1 if $line =~ /$flag/;
429 my ($line, $missing_flags_ref, @flags) = @_;
431 my @missing_flags = ();
432 foreach my $flag (@flags) {
433 if (not $line =~ /$flag/) {
434 push @missing_flags, $flag;
438 return 1 if scalar @missing_flags == 0;
440 @{$missing_flags_ref} = @missing_flags;
443 # Check if any of \@bad_flags occurs after $good_flag. Doesn't check if
444 # $good_flag is present.
445 sub flag_overwritten {
446 my ($line, $good_flag, $bad_flags) = @_;
448 if (not any_flags_used($line, @{$bad_flags})) {
453 foreach my $flag (@{$bad_flags}) {
454 while ($line =~ /$flag/g) {
455 if ($bad_pos < $+[0]) {
461 while ($line =~ /$good_flag/g) {
464 if ($good_pos > $bad_pos) {
470 sub cppflags_fortify_broken {
471 my ($line, $missing_flags) = @_;
473 # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
474 my $fortify_source = $def_cppflags_fortify[0];
476 # Some build systems enable/disable fortify source multiple times, check
478 if (not flag_overwritten($line,
480 \@def_cppflags_fortify_bad)) {
483 push @{$missing_flags}, $fortify_source;
487 sub cflags_stack_broken {
488 my ($line, $missing_flags, $strong) = @_;
490 my $flag = $strong ? $def_cflags_stack_strong[0]
491 : $def_cflags_stack[0];
493 if (not flag_overwritten($line, $flag, \@def_cflags_stack_bad)) {
496 push @{$missing_flags}, $flag;
500 # Modifies $missing_flags_ref array.
501 sub pic_pie_conflict {
502 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
504 return 0 if not $pie;
505 return 0 if not any_flags_used($line, @def_ldflags_pic);
507 my %flags = map { $_ => 1 } @flags_pie;
509 # Remove all PIE flags from @missing_flags as they are not required with
512 not exists $flags{$_}
513 } @{$missing_flags_ref};
514 @{$missing_flags_ref} = @result;
516 # We got a conflict when no flags are left, thus only PIE flags were
517 # missing. If other flags were missing abort because the conflict is not
519 return scalar @result == 0;
522 sub is_non_verbose_build {
523 my ($line, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
525 if ($line =~ /$libtool_regex/o) {
526 # libtool's --silent hides the real compiler flags.
527 if ($line =~ /\s--silent/) {
529 # If --silent is not present, skip this line as some compiler flags
530 # might be missing (e.g. -fPIE) which are handled correctly by libtool
531 # internally. libtool displays the real compiler command on the next
532 # line, so the flags are checked as usual.
539 if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
540 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
541 or $line =~ /^\s*[][\/0-9 ]*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
542 or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
543 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
549 # C++ compiler setting.
550 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
551 return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
552 # "Compiling" non binary files.
553 return 0 if $line =~ /^\s*Compiling \S+\.(?:py|pyx|el)['"]?\s*(?:\.\.\.|because it changed\.)?$/;
554 return 0 if $line =~ /^\s*[Cc]ompiling catalog \S+\.po\b/;
555 # "Compiling" with no file name.
556 if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
557 # $file_extension_regex may need spaces around the filename.
558 return 0 if not " $1 " =~ /$file_extension_regex/o;
563 # On the first pass we only check if this line is verbose or not.
564 return 1 if not defined $input_ref;
566 # Second pass, we have access to the next lines.
569 # CMake and other build systems print the non-verbose messages also when
570 # building verbose. If a compiler and the file name occurs in the next
571 # lines, treat it as verbose build.
573 # Get filename, we can't use the complete path as only parts of it are
574 # used in the real compiler command.
575 $file =~ m{/([^/\s]+)$};
578 for (my $i = 1; $i <= $line_count; $i++) {
579 my $next_line = $input_ref->[$line_offset + $i];
580 last unless defined $next_line;
582 if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
583 # Not a non-verbose line, but we still have to skip the
584 # current line as it doesn't contain any compiler commands.
594 # Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
596 my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
598 my %removes = map { $_ => 1 } @flags;
599 foreach my $flags (@{$flag_refs_ref}) {
601 # Flag found as string.
602 not exists $removes{$_}
603 # Flag found as string representation of regexp.
604 and (not defined $flag_renames_ref->{$_}
605 or not exists $removes{$flag_renames_ref->{$_}})
612 # Modifies $flag_renames_ref hash.
613 sub compile_flag_regexp {
614 my ($flag_renames_ref, @flags) = @_;
617 foreach my $flag (@flags) {
618 # Compile flag regexp for faster execution.
619 my $regex = qr/\s$flag(?:\s|\\)/;
621 # Store flag name in replacement string for correct flags in messages
622 # with qr//ed flag regexps.
623 $flag_renames_ref->{$regex}
624 = (exists $flag_renames_ref->{$flag})
625 ? $flag_renames_ref->{$flag}
628 push @result, $regex;
633 # Does any extension in @extensions exist in %{$extensions_ref}?
634 sub extension_found {
635 my ($extensions_ref, @extensions) = @_;
637 foreach my $extension (@extensions) {
638 if (exists $extensions_ref->{$extension}) {
648 # Parse command line arguments.
650 my $option_version = 0;
652 my $option_bindnow = 0;
653 my @option_ignore_arch = ();
654 my @option_ignore_flag = ();
655 my @option_ignore_arch_flag = ();
656 my @option_ignore_line = ();
657 my @option_ignore_arch_line = ();
659 my $option_arch = undef;
660 my $option_buildd = 0;
661 my $option_debian = 0;
663 my $option_line_numbers = 0;
664 if (not Getopt::Long::GetOptions(
665 'help|h|?' => \$option_help,
666 'version' => \$option_version,
668 'pie' => \$option_pie,
669 'bindnow' => \$option_bindnow,
670 'all' => \$option_all,
672 'ignore-arch=s' => \@option_ignore_arch,
673 'ignore-flag=s' => \@option_ignore_flag,
674 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
675 'ignore-line=s' => \@option_ignore_line,
676 'ignore-arch-line=s' => \@option_ignore_arch_line,
678 'color' => \$option_color,
679 'arch=s' => \$option_arch,
680 'buildd' => \$option_buildd,
681 'debian' => \$option_debian,
682 'line-numbers' => \$option_line_numbers,
685 Pod::Usage::pod2usage(2);
689 Pod::Usage::pod2usage(1);
691 if ($option_version) {
693 blhc $VERSION Copyright (C) 2012-2020 Simon Ruderich
695 This program is free software: you can redistribute it and/or modify
696 it under the terms of the GNU General Public License as published by
697 the Free Software Foundation, either version 3 of the License, or
698 (at your option) any later version.
700 This program is distributed in the hope that it will be useful,
701 but WITHOUT ANY WARRANTY; without even the implied warranty of
702 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
703 GNU General Public License for more details.
705 You should have received a copy of the GNU General Public License
706 along with this program. If not, see <http://www.gnu.org/licenses/>.
712 if (scalar @ARGV == 0) {
714 Pod::Usage::pod2usage(2);
717 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
718 # installed on Debian's buildds.
719 if (not $option_buildd) {
720 require Term::ANSIColor;
728 # Precompiled ignores for faster lookup.
729 my %option_ignore_arch_flag = ();
730 my %option_ignore_arch_line = ();
732 # Strip flags which should be ignored.
733 if (scalar @option_ignore_flag > 0) {
734 remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
736 # Same for arch specific ignore flags, but only prepare here.
737 if (scalar @option_ignore_arch_flag > 0) {
738 foreach my $ignore (@option_ignore_arch_flag) {
739 my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
741 if (not $ignore_arch or not $ignore_flag) {
742 printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
743 . '("arch:flag" expected)' . "\n", $ignore;
745 Pod::Usage::pod2usage(2);
748 push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
752 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
754 foreach my $flags (@flag_refs_all) {
755 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
758 # Precompile ignore line regexps, also anchor at beginning and end of line.
759 # Additional entries are also extracted from the build log, see below.
760 foreach my $ignore (@option_ignore_line) {
761 $ignore = qr/^$ignore$/;
763 # Same for arch specific ignore lines.
764 if (scalar @option_ignore_arch_line > 0) {
765 foreach my $ignore (@option_ignore_arch_line) {
766 my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
768 if (not $ignore_arch or not $ignore_line) {
769 printf STDERR 'Value "%s" invalid for option ignore-arch-line '
770 . '("arch:line" expected)' . "\n", $ignore;
772 Pod::Usage::pod2usage(2);
775 push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
783 foreach my $file (@ARGV) {
784 print "checking '$file'...\n" if scalar @ARGV > 1;
786 -f $file or die "No such file: $file";
788 open my $fh, '<', $file or die $!;
790 # Architecture of this file.
791 my $arch = $option_arch;
793 # Hardening options. Not all architectures support all hardening options.
794 my $harden_format = 1;
795 my $harden_fortify = 1;
796 my $harden_stack = 1;
797 my $harden_stack_strong = 1;
798 my $harden_relro = 1;
799 my $harden_bindnow = $option_bindnow; # defaults to 0
800 my $harden_pie = $option_pie; # defaults to 0
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 # This flags is not always available, but if it is use it.
913 if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
917 # We skip over unimportant lines at the beginning of the log to
918 # prevent false positives.
919 last if index($line, 'dpkg-buildpackage: ') == 0;
922 # Input lines, contain only the lines with compiler commands.
924 # Non-verbose lines in the input. Used to reduce calls to
925 # is_non_verbose_build() (which is quite slow) in the second loop when
926 # it's already clear if a line is non-verbose or not.
927 my @input_nonverbose = ();
929 my @input_number = ();
931 my $continuation = 0;
932 my $complete_line = undef;
934 while (my $line = <$fh>) {
937 # And stop at the end of the build log. Package details (reported by
938 # the buildd logs) are not important for us. This also prevents false
940 last if index($line, 'Build finished at ') == 0
941 and $line =~ /^Build finished at \d{8}-\d{4}$/;
943 if (not $continuation) {
947 # Detect architecture automatically unless overridden.
949 and index($line, 'dpkg-buildpackage: info: host architecture ') == 0) {
950 $arch = substr $line, 43, -1; # -1 to ignore '\n' at the end
951 # Older versions of dpkg-buildpackage
953 and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
954 $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
956 # Old buildd logs use e.g. "host architecture is alpha", remove
957 # the "is", otherwise debarch_to_debtriplet() will not detect the
959 if (index($arch, 'is ') == 0) {
960 $arch = substr $arch, 3;
964 # Permit dynamic excludes from within the build log to ignore false
965 # positives. Cannot use a separate config file as we often only have
966 # the build log itself.
967 if (index($line, 'blhc: ignore-line-regexp: ') == 0) {
968 my $ignore = substr $line, 26, -1; # -1 to ignore '\n' at the end
969 push @option_ignore_line, qr/^$ignore$/;
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 # Treat each command as a single line so we don't ignore valid
995 # commands when handling false positives. split_line() is slow, only
996 # use it when necessary.
997 my @line = ($line !~ /(?:;|&&|\|\|)/)
1000 foreach my $line (@line) {
1001 if ($continuation) {
1004 # Join lines, but leave the "\" in place so it's clear where
1005 # the original line break was.
1006 chomp $complete_line;
1007 $complete_line .= ' ' . $line;
1009 # Line continuation, line ends with "\".
1010 if ($line =~ /\\$/) {
1012 # Start line continuation.
1013 if (not defined $complete_line) {
1014 $complete_line = $line;
1019 # Use the complete line if a line continuation occurred.
1020 if (defined $complete_line) {
1021 $line = $complete_line;
1022 $complete_line = undef;
1025 # Ignore lines with no compiler commands.
1026 next if not $non_verbose
1027 and not $line =~ /$cc_regex_normal/o;
1028 # Ignore lines with no filenames with extensions. May miss some
1029 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
1030 # a problem as the log will most likely contain other non-verbose
1031 # commands which are detected.
1032 next if not $non_verbose
1033 and not $line =~ /$file_extension_regex/o;
1035 # Ignore false positives.
1037 # `./configure` output.
1038 next if not $non_verbose
1039 and $line =~ /^(?:checking|[Cc]onfigure:) /;
1040 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
1041 [Cc]ompiler[\s.]*:?\s+
1043 next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
1044 \s*=\s*$cc_regex_full
1045 # optional compiler options, don't allow
1046 # "everything" here to prevent false negatives
1047 \s*(?:\s-\S+)*\s*$}xo;
1048 # `echo` is never a compiler command
1049 next if $line =~ /^\s*echo\s/;
1050 # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
1051 # line (or similar for other architectures) which gets recognized
1052 # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
1053 # C++ files. No hardening flags are relevant during this step,
1054 # thus ignore `moc-qt*` lines. The resulting files will be
1055 # compiled in a separate step (and therefore checked).
1056 next if $line =~ m{^\S+/bin/moc(?:-qt[45])?
1058 -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
1060 # Ignore false positives when the line contains only CC=gcc but no
1061 # other gcc command.
1062 if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
1065 next if not $before =~ /$cc_regex_normal/o
1066 and not $after =~ /$cc_regex_normal/o;
1068 # Ignore false positives caused by gcc -v. It outputs a line
1069 # looking like a normal compiler line but which is sometimes
1070 # missing hardening flags, although the normal compiler line
1072 next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
1073 [0-9.]+/cc1(?:plus)?}xo;
1074 # Ignore false positive with `rm` which may remove files which
1075 # look like a compiler executable thus causing the line to be
1076 # treated as a normal compiler line.
1077 next if $line =~ m{^\s*rm\s+};
1078 next if $line =~ m{^\s*dwz\s+};
1079 # Some build systems emit "gcc > file".
1080 next if $line =~ m{$cc_regex_normal\s*>\s*\S+}o;
1081 # Hex output may contain "cc".
1082 next if $line =~ m#(?:\b[0-9a-fA-F]{2,}\b\s*){5}#;
1083 # Meson build output
1084 next if $line =~ /^C\+\+ linker for the host machine: /;
1085 # Embedded `gcc -print-*` commands
1086 next if $line =~ /`$cc_regex_normal\s*[^`]*-print-\S+`/;
1088 # Check if additional hardening options were used. Used to ensure
1089 # they are used for the complete build.
1090 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie,
1092 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
1095 push @input_nonverbose, $non_verbose;
1096 push @input_number, $number if $option_line_numbers;
1100 close $fh or die $!;
1102 # Ignore arch if requested.
1103 if (scalar @option_ignore_arch > 0 and $arch) {
1104 foreach my $ignore (@option_ignore_arch) {
1105 if ($arch eq $ignore) {
1106 print "ignoring architecture '$arch'\n";
1112 if (scalar @input == 0) {
1113 if (not $option_buildd) {
1114 print "No compiler commands!\n";
1115 $exit |= $exit_code{no_compiler_commands};
1117 print "$buildd_tag{no_compiler_commands}||\n";
1122 if ($option_buildd) {
1123 $statistics{commands} += scalar @input;
1126 # Option or auto detected.
1128 # The following was partially copied from dpkg-dev 1.20.5
1129 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, _add_build_flags()),
1130 # copyright Raphaël Hertzog <hertzog@debian.org>, Guillem Jover
1131 # <guillem@debian.org>, Kees Cook <kees@debian.org>, Canonical, Ltd.
1132 # licensed under GPL version 2 or later. Keep it in sync.
1136 # Recent dpkg versions use a quadruplet for arch. Support both.
1138 (undef, undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
1141 (undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
1144 my %builtin_pie_arch = map { $_ => 1 } qw(
1165 # Disable unsupported hardening options.
1166 if ($os !~ /^(?:linux|kfreebsd|knetbsd|hurd)$/
1167 or $cpu =~ /^(?:hppa|avr32)$/) {
1170 if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
1172 $harden_stack_strong = 0;
1174 if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
1176 $harden_bindnow = 0;
1179 if ($disable_harden_pie and exists $builtin_pie_arch{$arch}) {
1185 my @cflags = @def_cflags;
1186 my @cxxflags = @def_cxxflags;
1187 my @cppflags = @def_cppflags;
1188 my @ldflags = @def_ldflags;
1189 # Check the specified hardening options, same order as dpkg-buildflags.
1191 @cflags = (@cflags, @def_cflags_pie);
1192 @cxxflags = (@cxxflags, @def_cflags_pie);
1193 @ldflags = (@ldflags, @def_ldflags_pie);
1195 if ($harden_stack_strong) {
1196 @cflags = (@cflags, @def_cflags_stack_strong);
1197 @cxxflags = (@cxxflags, @def_cflags_stack_strong);
1198 } elsif ($harden_stack) {
1199 @cflags = (@cflags, @def_cflags_stack);
1200 @cxxflags = (@cxxflags, @def_cflags_stack);
1202 if ($harden_fortify) {
1203 @cflags = (@cflags, @def_cflags_fortify);
1204 @cxxflags = (@cxxflags, @def_cflags_fortify);
1205 @cppflags = (@cppflags, @def_cppflags_fortify);
1207 if ($harden_format) {
1208 @cflags = (@cflags, @def_cflags_format);
1209 @cxxflags = (@cxxflags, @def_cflags_format);
1211 if ($harden_relro) {
1212 @ldflags = (@ldflags, @def_ldflags_relro);
1214 if ($harden_bindnow) {
1215 @ldflags = (@ldflags, @def_ldflags_bindnow);
1218 # Ada doesn't support format hardening flags, see #680117 for more
1219 # information. Same for fortran.
1221 my @cflags_noformat = grep {
1223 foreach my $flag (@def_cflags_format) {
1224 $ok = 0 if $_ eq $flag;
1229 # Hack to fix cppflags_fortify_broken() if --ignore-flag
1230 # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
1231 # as long as @def_cppflags_fortify contains only one variable.
1232 if (scalar @def_cppflags_fortify == 0) {
1233 $harden_fortify = 0;
1236 # Ignore flags for this arch if requested.
1237 if ($arch and exists $option_ignore_arch_flag{$arch}) {
1238 my @local_flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
1240 remove_flags(\@local_flag_refs,
1242 @{$option_ignore_arch_flag{$arch}});
1245 my @ignore_line = @option_ignore_line;
1246 # Ignore lines for this arch if requested.
1247 if ($arch and exists $option_ignore_arch_line{$arch}) {
1248 @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
1252 for (my $i = 0; $i < scalar @input; $i++) {
1253 my $line = $input[$i];
1255 # Ignore line if requested.
1256 foreach my $ignore (@ignore_line) {
1257 next LINE if $line =~ /$ignore/;
1261 if ($input_nonverbose[$i]
1262 and is_non_verbose_build($line, \$skip,
1263 \@input, $i, $parallel)) {
1264 if (not $option_buildd) {
1265 error_non_verbose_build($line, $input_number[$i]);
1266 $exit |= $exit_code{non_verbose_build};
1268 $statistics{commands_nonverbose}++;
1272 # Even if it's a verbose build, we might have to skip this line (see
1273 # is_non_verbose_build()).
1276 my $orig_line = $line;
1278 # Remove everything until and including the compiler command. Makes
1279 # checks easier and faster.
1280 $line =~ s/^.*?$cc_regex//o;
1281 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
1282 # the brace and similar characters at the line end.
1283 $line =~ s/['")]+$//;
1285 # Skip unnecessary tests when only preprocessing.
1286 my $flag_preprocess = 0;
1293 # Preprocess, compile, assemble.
1294 if ($line =~ /\s(-E|-S|-c)\b/) {
1296 $flag_preprocess = 1 if $1 eq '-E';
1297 $compile = 1 if $1 eq '-S' or $1 eq '-c';
1298 # Dependency generation for Makefiles. The other flags (-MF -MG -MP
1299 # -MT -MQ) are always used with -M/-MM.
1300 } elsif ($line =~ /\s(?:-M|-MM)\b/) {
1302 # Otherwise assume we are linking.
1307 # -MD/-MMD also cause dependency generation, but they don't imply -E!
1308 if ($line =~ /\s(?:-MD|-MMD)\b/) {
1310 $flag_preprocess = 0;
1313 # Dependency generation for Makefiles, no preprocessing or other flags
1315 next if $dependency;
1317 # Get all file extensions on this line.
1318 my @extensions = $line =~ /$file_extension_regex/go;
1319 # Ignore all unknown extensions to speedup the search below.
1320 @extensions = grep { exists $extension{$_} } @extensions;
1322 # These file types don't require preprocessing.
1323 if (extension_found(\%extensions_no_preprocess, @extensions)) {
1326 # These file types require preprocessing.
1327 if (extension_found(\%extensions_preprocess, @extensions)) {
1328 # Prevent false positives with "libtool: link: g++ -include test.h
1329 # .." compiler lines.
1330 if ($orig_line !~ /$libtool_link_regex/o) {
1335 if (not $flag_preprocess) {
1336 # If there are source files then it's compiling/linking in one
1337 # step and we must check both. We only check for source files
1338 # here, because header files cause too many false positives.
1339 if (extension_found(\%extensions_compile_link, @extensions)) {
1340 # Assembly files don't need CFLAGS.
1341 if (not extension_found(\%extensions_compile, @extensions)
1342 and extension_found(\%extensions_no_compile, @extensions)) {
1344 # But the rest does.
1348 # No compilable extensions found, either linking or compiling
1351 # If there are also no object files we are just compiling headers
1352 # (.h -> .h.gch). Don't check for linker flags in this case. Due
1353 # to our liberal checks for compiler lines, this also reduces the
1354 # number of false positives considerably.
1356 and not extension_found(\%extensions_object, @extensions)) {
1361 my $compile_cpp = 0;
1362 my $restore_cflags = 0;
1363 # Assume CXXFLAGS are required when a C++ file is specified in the
1366 and extension_found(\%extensions_compile_cpp, @extensions)) {
1369 # Ada needs special CFLAGS
1370 } elsif (extension_found(\%extensions_ada, @extensions)) {
1371 $restore_cflags = 1;
1372 $preprocess = 0; # Ada uses no CPPFLAGS
1373 @cflags_backup = @cflags;
1374 @cflags = @cflags_noformat;
1376 } elsif (extension_found(\%extensions_fortran, @extensions)) {
1377 $restore_cflags = 1;
1378 @cflags_backup = @cflags;
1379 @cflags = @cflags_noformat;
1382 if ($option_buildd) {
1383 $statistics{preprocess}++ if $preprocess;
1384 $statistics{compile}++ if $compile;
1385 $statistics{compile_cpp}++ if $compile_cpp;
1386 $statistics{link}++ if $link;
1389 # Check if there are flags indicating a debug build. If that's true,
1390 # skip the check for -O2. This prevents fortification, but that's fine
1391 # for a debug build.
1392 if (any_flags_used($line, @def_cflags_debug)) {
1393 remove_flags([\@cflags], \%flag_renames, $def_cflags[1]);
1394 remove_flags([\@cppflags], \%flag_renames, $def_cppflags_fortify[0]);
1397 # Check hardening flags.
1399 if ($compile and (not all_flags_used($line, \@missing, @cflags)
1400 or (($harden_stack or $harden_stack_strong)
1401 and cflags_stack_broken($line, \@missing,
1402 $harden_stack_strong)))
1403 # Libraries linked with -fPIC don't have to (and can't) be
1404 # linked with -fPIE as well. It's no error if only PIE flags
1406 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1407 # Assume dpkg-buildflags returns the correct flags.
1408 and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
1409 if (not $option_buildd) {
1410 error_flags('CFLAGS missing', \@missing, \%flag_renames,
1411 $input[$i], $input_number[$i]);
1412 $exit |= $exit_code{flags_missing};
1414 $statistics{compile_missing}++;
1416 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
1417 # Libraries linked with -fPIC don't have to (and can't) be
1418 # linked with -fPIE as well. It's no error if only PIE flags
1420 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1421 # Assume dpkg-buildflags returns the correct flags.
1422 and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
1423 if (not $option_buildd) {
1424 error_flags('CXXFLAGS missing', \@missing, \%flag_renames,
1425 $input[$i], $input_number[$i]);
1426 $exit |= $exit_code{flags_missing};
1428 $statistics{compile_cpp_missing}++;
1432 and (not all_flags_used($line, \@missing, @cppflags)
1433 # The fortify flag might be overwritten, detect that.
1435 and cppflags_fortify_broken($line, \@missing)))
1436 # Assume dpkg-buildflags returns the correct flags.
1437 and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
1438 if (not $option_buildd) {
1439 error_flags('CPPFLAGS missing', \@missing, \%flag_renames,
1440 $input[$i], $input_number[$i]);
1441 $exit |= $exit_code{flags_missing};
1443 $statistics{preprocess_missing}++;
1446 if ($link and not all_flags_used($line, \@missing, @ldflags)
1447 # Same here, -fPIC conflicts with -fPIE.
1448 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
1449 # Assume dpkg-buildflags returns the correct flags.
1450 and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
1451 if (not $option_buildd) {
1452 error_flags('LDFLAGS missing', \@missing, \%flag_renames,
1453 $input[$i], $input_number[$i]);
1454 $exit |= $exit_code{flags_missing};
1456 $statistics{link_missing}++;
1460 # Restore normal CFLAGS.
1461 if ($restore_cflags) {
1462 @cflags = @cflags_backup;
1467 # Print statistics for buildd mode, only output in this mode.
1468 if ($option_buildd) {
1471 if ($statistics{preprocess_missing}) {
1472 push @warning, sprintf 'CPPFLAGS %d (of %d)',
1473 $statistics{preprocess_missing},
1474 $statistics{preprocess};
1476 if ($statistics{compile_missing}) {
1477 push @warning, sprintf 'CFLAGS %d (of %d)',
1478 $statistics{compile_missing},
1479 $statistics{compile};
1481 if ($statistics{compile_cpp_missing}) {
1482 push @warning, sprintf 'CXXFLAGS %d (of %d)',
1483 $statistics{compile_cpp_missing},
1484 $statistics{compile_cpp};
1486 if ($statistics{link_missing}) {
1487 push @warning, sprintf 'LDFLAGS %d (of %d)',
1488 $statistics{link_missing},
1491 if (scalar @warning) {
1492 local $" = ', '; # array join string
1493 print "$buildd_tag{flags_missing}|@warning missing|\n";
1496 if ($statistics{commands_nonverbose}) {
1497 printf "$buildd_tag{non_verbose_build}|%d (of %d) hidden|\n",
1498 $statistics{commands_nonverbose},
1499 $statistics{commands},
1511 blhc - build log hardening check, checks build logs for missing hardening flags
1515 B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>
1519 blhc is a small tool which checks build logs for missing hardening flags. It's
1520 licensed under the GPL 3 or later.
1522 It's designed to check build logs generated by Debian's dpkg-buildpackage (or
1523 tools using dpkg-buildpackage like pbuilder or sbuild (which is used for the
1524 official buildd build logs)) to help maintainers detect missing hardening
1525 flags in their packages.
1527 Only gcc is detected as compiler at the moment. If other compilers support
1528 hardening flags as well, please report them.
1530 If there's no output, no flags are missing and the build log is fine.
1532 See F<README> for details about performed checks, auto-detection and
1535 =head1 FALSE POSITIVES
1537 To suppress false positives you can embed the following string in the build
1540 blhc: ignore-line-regexp: REGEXP
1542 All lines fully matching REGEXP (see B<--ignore-line> for details) will be
1545 Please use this feature sparingly so that missing flags are not overlooked. If
1546 you find false positives which affect more packages please report a bug.
1548 To generate this string simply use echo in C<debian/rules>; make sure to use @
1549 to suppress the echo command itself as it could also trigger a false positive.
1557 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
1560 =item B<--arch> I<architecture>
1562 Set the specific architecture (e.g. amd64, armel, etc.), automatically
1563 disables hardening flags not available on this architecture. Is detected
1564 automatically if dpkg-buildpackage is used.
1568 Force check for all +bindnow hardening flags. By default it's auto detected.
1572 Special mode for buildds when automatically parsing log files. The following
1573 changes are in effect:
1579 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1584 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1589 Don't require Term::ANSIColor.
1593 Return exit code 0, unless there was a error (-I, -W messages don't count as
1600 Apply Debian-specific settings. At the moment this only disables checking for
1601 PIE which is automatically applied by Debian's GCC and no longer requires a
1602 compiler command line argument.
1606 Use colored (ANSI) output for warning messages.
1608 =item B<--line-numbers>
1610 Display line numbers.
1612 =item B<--ignore-arch> I<arch>
1614 Ignore build logs from architectures matching I<arch>. I<arch> is a string.
1616 Used to prevent false positives. This option can be specified multiple times.
1618 =item B<--ignore-arch-flag> I<arch>:I<flag>
1620 Like B<--ignore-flag>, but only ignore flag on I<arch>.
1622 =item B<--ignore-arch-line> I<arch>:I<line>
1624 Like B<--ignore-line>, but only ignore line on I<arch>.
1626 =item B<--ignore-flag> I<flag>
1628 Don't print an error when the specific flag is missing in a compiler line.
1629 I<flag> is a string.
1631 Used to prevent false positives. This option can be specified multiple times.
1633 =item B<--ignore-line> I<regex>
1635 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1636 at the beginning and end of the line to prevent false negatives.
1638 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1639 warnings (which have line continuation resolved).
1641 Used to prevent false positives. This option can be specified multiple times.
1645 Force check for all +pie hardening flags. By default it's auto detected.
1647 =item B<-h -? --help>
1649 Print available options.
1653 Print version number and license.
1657 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1658 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1659 all other commands as well.
1663 Normal usage, parse a single log file.
1665 blhc path/to/log/file
1667 If there's no output, no flags are missing and the build log is fine.
1669 Parse multiple log files. The exit code is ORed over all files.
1671 blhc path/to/directory/with/log/files/*
1673 Don't treat missing C<-g> as error:
1675 blhc --ignore-flag -g path/to/log/file
1677 Don't treat missing C<-pie> on kfreebsd-amd64 as error:
1679 blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
1681 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1684 blhc --ignore-line '\./script gcc file' path/to/log/file
1686 Ignore lines matching C<./script gcc file> somewhere in the line.
1688 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1690 Use blhc with pbuilder.
1692 pbuilder path/to/package.dsc | tee path/log/file
1693 blhc path/to/file || echo flags missing
1695 Assume this build log was created on a Debian system and thus don't warn about
1696 missing PIE flags if the current architecture injects them automatically (this
1697 is enabled in buildd mode per default). C<--arch> is necessary if the build
1698 log contains no architecture information as written by dpkg-buildpackage.
1700 blhc --debian --all --arch=amd64 path/to/log/file
1704 The following tags are used in I<--buildd> mode. In braces the additional data
1709 =item B<I-hardening-wrapper-used>
1711 The package uses hardening-wrapper which intercepts calls to gcc and adds
1712 hardening flags. The build log doesn't contain any hardening flags and thus
1713 can't be checked by blhc.
1715 =item B<W-compiler-flags-hidden> (summary of hidden lines)
1717 Build log contains lines which hide the real compiler flags. For example:
1724 Most of the time either C<export V=1> or C<export verbose=1> in
1725 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1726 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1727 patched to remove the C<@>s hiding the real compiler commands.
1729 =item B<W-dpkg-buildflags-missing> (summary of missing flags)
1731 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1733 =item B<I-invalid-cmake-used> (version)
1735 By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
1736 patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
1737 patch was rejected by upstream and later reverted in Debian. Thus those two
1738 versions show correct usage of CPPFLAGS even if the package doesn't correctly
1739 handle them (for example by passing them to CFLAGS). To prevent false
1740 negatives just blacklist those two versions.
1742 =item B<I-no-compiler-commands>
1744 No compiler commands were detected. Either the log contains none or they were
1745 not correctly detected by blhc (please report the bug in this case).
1751 The exit status is a "bit mask", each listed status is ORed when the error
1752 condition occurs to get the result.
1762 No compiler commands were found.
1766 Invalid arguments/options given to blhc.
1774 Missing hardening flags.
1778 Hardening wrapper detected, no tests performed.
1782 Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
1783 TAGS"> for a detailed explanation.
1789 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1791 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1792 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1794 =head1 LICENSE AND COPYRIGHT
1796 Copyright (C) 2012-2020 by Simon Ruderich
1798 This program is free software: you can redistribute it and/or modify
1799 it under the terms of the GNU General Public License as published by
1800 the Free Software Foundation, either version 3 of the License, or
1801 (at your option) any later version.
1803 This program is distributed in the hope that it will be useful,
1804 but WITHOUT ANY WARRANTY; without even the implied warranty of
1805 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1806 GNU General Public License for more details.
1808 You should have received a copy of the GNU General Public License
1809 along with this program. If not, see <http://www.gnu.org/licenses/>.
1813 L<hardening-check(1)>, L<dpkg-buildflags(1)>