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 # $def_cppflags_fortify[0].
250 my @def_cppflags_fortify_bad = (
251 # These flags may overwrite -D_FORTIFY_SOURCE=2.
253 '-D_FORTIFY_SOURCE=0',
254 '-D_FORTIFY_SOURCE=1',
256 my @def_ldflags = ();
257 my @def_ldflags_relro = (
260 my @def_ldflags_bindnow = (
263 my @def_ldflags_pie = (
267 my @def_ldflags_pic = (
272 # References to all flags checked by the flag checker.
276 \@def_cflags_fortify,
278 \@def_cflags_stack_strong,
279 \@def_cflags_stack_bad,
283 \@def_cppflags_fortify,
286 \@def_ldflags_bindnow,
289 # References to all used flags.
290 my @flag_refs_all = (
293 \@def_cppflags_fortify_bad,
296 # Renaming rules for the output so the regex parts are not visible. Also
297 # stores string values of flag regexps above, see compile_flag_regexp().
299 '-O(?:2|3)' => '-O2',
300 '-Wformat(?:=2)?' => '-Wformat',
301 '--param[= ]ssp-buffer-size=4' => '--param=ssp-buffer-size=4',
302 '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
303 '-Wl,(?:-z,)?now' => '-Wl,-z,now',
307 no_compiler_commands => 1 << 0,
308 # used by POD::Usage => 1 << 1,
309 non_verbose_build => 1 << 2,
310 flags_missing => 1 << 3,
311 hardening_wrapper => 1 << 4,
312 invalid_cmake => 1 << 5,
316 no_compiler_commands => 'I-no-compiler-commands',
317 non_verbose_build => 'W-compiler-flags-hidden',
318 flags_missing => 'W-dpkg-buildflags-missing',
319 hardening_wrapper => 'I-hardening-wrapper-used',
320 invalid_cmake => 'I-invalid-cmake-used',
323 # Statistics of missing flags and non-verbose build commands. Used for
327 preprocess_missing => 0,
329 compile_missing => 0,
331 compile_cpp_missing => 0,
335 commands_nonverbose => 0,
338 # Use colored (ANSI) output?
345 my ($message, $missing_flags_ref, $flag_renames_ref, $line, $number) = @_;
347 # Get string value of qr//-escaped regexps and if requested rename them.
348 my @missing_flags = map {
349 $flag_renames_ref->{$_}
350 } @{$missing_flags_ref};
352 my $flags = join ' ', @missing_flags;
353 printf '%d:', $number if defined $number;
354 printf '%s (%s)%s %s',
355 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
360 sub error_non_verbose_build {
361 my ($line, $number) = @_;
363 printf '%d:', $number if defined $number;
365 error_color('NONVERBOSE BUILD', 'red'),
366 error_color(':', 'yellow'),
371 sub error_invalid_cmake {
375 error_color('INVALID CMAKE', 'red'),
376 error_color(':', 'yellow'),
381 sub error_hardening_wrapper {
383 error_color('HARDENING WRAPPER', 'red'),
384 error_color(':', 'yellow'),
385 'no checks possible, aborting';
390 my ($message, $color) = @_;
393 return Term::ANSIColor::colored($message, $color);
400 my ($line, @flags) = @_;
402 foreach my $flag (@flags) {
403 return 1 if $line =~ /$flag/;
409 my ($line, $missing_flags_ref, @flags) = @_;
411 my @missing_flags = ();
412 foreach my $flag (@flags) {
413 if (not $line =~ /$flag/) {
414 push @missing_flags, $flag;
418 return 1 if scalar @missing_flags == 0;
420 @{$missing_flags_ref} = @missing_flags;
423 # Check if any of \@bad_flags occurs after $good_flag. Doesn't check if
424 # $good_flag is present.
425 sub flag_overwritten {
426 my ($line, $good_flag, $bad_flags) = @_;
428 if (not any_flags_used($line, @{$bad_flags})) {
433 foreach my $flag (@{$bad_flags}) {
434 while ($line =~ /$flag/g) {
435 if ($bad_pos < $+[0]) {
441 while ($line =~ /$good_flag/g) {
444 if ($good_pos > $bad_pos) {
450 sub cppflags_fortify_broken {
451 my ($line, $missing_flags) = @_;
453 # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
454 my $fortify_source = $def_cppflags_fortify[0];
456 # Some build systems enable/disable fortify source multiple times, check
458 if (not flag_overwritten($line,
460 \@def_cppflags_fortify_bad)) {
463 push @{$missing_flags}, $fortify_source;
467 sub cflags_stack_broken {
468 my ($line, $missing_flags, $strong) = @_;
470 my $flag = $strong ? $def_cflags_stack_strong[0]
471 : $def_cflags_stack[0];
473 if (not flag_overwritten($line, $flag, \@def_cflags_stack_bad)) {
476 push @{$missing_flags}, $flag;
480 # Modifies $missing_flags_ref array.
481 sub pic_pie_conflict {
482 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
484 return 0 if not $pie;
485 return 0 if not any_flags_used($line, @def_ldflags_pic);
487 my %flags = map { $_ => 1 } @flags_pie;
489 # Remove all PIE flags from @missing_flags as they are not required with
492 not exists $flags{$_}
493 } @{$missing_flags_ref};
494 @{$missing_flags_ref} = @result;
496 # We got a conflict when no flags are left, thus only PIE flags were
497 # missing. If other flags were missing abort because the conflict is not
499 return scalar @result == 0;
502 sub is_non_verbose_build {
503 my ($line, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
505 if ($line =~ /$libtool_regex/o) {
506 # libtool's --silent hides the real compiler flags.
507 if ($line =~ /\s--silent/) {
509 # If --silent is not present, skip this line as some compiler flags
510 # might be missing (e.g. -fPIE) which are handled correctly by libtool
511 # internally. libtool displays the real compiler command on the next
512 # line, so the flags are checked as usual.
519 if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
520 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
521 or $line =~ /^\s*[][\/0-9 ]*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
522 or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
523 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
529 # C++ compiler setting.
530 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
531 return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
532 # "Compiling" non binary files.
533 return 0 if $line =~ /^\s*Compiling \S+\.(?:py|pyx|el)['"]?\s*(?:\.\.\.|because it changed\.)?$/;
534 return 0 if $line =~ /^\s*[Cc]ompiling catalog \S+\.po\b/;
535 # "Compiling" with no file name.
536 if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
537 # $file_extension_regex may need spaces around the filename.
538 return 0 if not " $1 " =~ /$file_extension_regex/o;
543 # On the first pass we only check if this line is verbose or not.
544 return 1 if not defined $input_ref;
546 # Second pass, we have access to the next lines.
549 # CMake and other build systems print the non-verbose messages also when
550 # building verbose. If a compiler and the file name occurs in the next
551 # lines, treat it as verbose build.
553 # Get filename, we can't use the complete path as only parts of it are
554 # used in the real compiler command.
555 $file =~ m{/([^/\s]+)$};
558 for (my $i = 1; $i <= $line_count; $i++) {
559 my $next_line = $input_ref->[$line_offset + $i];
560 last unless defined $next_line;
562 if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
563 # Not a non-verbose line, but we still have to skip the
564 # current line as it doesn't contain any compiler commands.
574 # Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
576 my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
578 my %removes = map { $_ => 1 } @flags;
579 foreach my $flags (@{$flag_refs_ref}) {
581 # Flag found as string.
582 not exists $removes{$_}
583 # Flag found as string representation of regexp.
584 and (not defined $flag_renames_ref->{$_}
585 or not exists $removes{$flag_renames_ref->{$_}})
592 # Modifies $flag_renames_ref hash.
593 sub compile_flag_regexp {
594 my ($flag_renames_ref, @flags) = @_;
597 foreach my $flag (@flags) {
598 # Compile flag regexp for faster execution.
599 my $regex = qr/\s$flag(?:\s|\\)/;
601 # Store flag name in replacement string for correct flags in messages
602 # with qr//ed flag regexps.
603 $flag_renames_ref->{$regex}
604 = (exists $flag_renames_ref->{$flag})
605 ? $flag_renames_ref->{$flag}
608 push @result, $regex;
613 # Does any extension in @extensions exist in %{$extensions_ref}?
614 sub extension_found {
615 my ($extensions_ref, @extensions) = @_;
617 foreach my $extension (@extensions) {
618 if (exists $extensions_ref->{$extension}) {
628 # Parse command line arguments.
630 my $option_version = 0;
632 my $option_bindnow = 0;
633 my @option_ignore_arch = ();
634 my @option_ignore_flag = ();
635 my @option_ignore_arch_flag = ();
636 my @option_ignore_line = ();
637 my @option_ignore_arch_line = ();
639 my $option_arch = undef;
640 my $option_buildd = 0;
641 my $option_debian = 0;
643 my $option_line_numbers = 0;
644 if (not Getopt::Long::GetOptions(
645 'help|h|?' => \$option_help,
646 'version' => \$option_version,
648 'pie' => \$option_pie,
649 'bindnow' => \$option_bindnow,
650 'all' => \$option_all,
652 'ignore-arch=s' => \@option_ignore_arch,
653 'ignore-flag=s' => \@option_ignore_flag,
654 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
655 'ignore-line=s' => \@option_ignore_line,
656 'ignore-arch-line=s' => \@option_ignore_arch_line,
658 'color' => \$option_color,
659 'arch=s' => \$option_arch,
660 'buildd' => \$option_buildd,
661 'debian' => \$option_debian,
662 'line-numbers' => \$option_line_numbers,
665 Pod::Usage::pod2usage(2);
669 Pod::Usage::pod2usage(1);
671 if ($option_version) {
673 blhc $VERSION Copyright (C) 2012-2020 Simon Ruderich
675 This program is free software: you can redistribute it and/or modify
676 it under the terms of the GNU General Public License as published by
677 the Free Software Foundation, either version 3 of the License, or
678 (at your option) any later version.
680 This program is distributed in the hope that it will be useful,
681 but WITHOUT ANY WARRANTY; without even the implied warranty of
682 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
683 GNU General Public License for more details.
685 You should have received a copy of the GNU General Public License
686 along with this program. If not, see <http://www.gnu.org/licenses/>.
692 if (scalar @ARGV == 0) {
694 Pod::Usage::pod2usage(2);
697 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
698 # installed on Debian's buildds.
699 if (not $option_buildd) {
700 require Term::ANSIColor;
708 # Precompiled ignores for faster lookup.
709 my %option_ignore_arch_flag = ();
710 my %option_ignore_arch_line = ();
712 # Strip flags which should be ignored.
713 if (scalar @option_ignore_flag > 0) {
714 remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
716 # Same for arch specific ignore flags, but only prepare here.
717 if (scalar @option_ignore_arch_flag > 0) {
718 foreach my $ignore (@option_ignore_arch_flag) {
719 my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
721 if (not $ignore_arch or not $ignore_flag) {
722 printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
723 . '("arch:flag" expected)' . "\n", $ignore;
725 Pod::Usage::pod2usage(2);
728 push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
732 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
734 foreach my $flags (@flag_refs_all) {
735 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
738 # Precompile ignore line regexps, also anchor at beginning and end of line.
739 # Additional entries are also extracted from the build log, see below.
740 foreach my $ignore (@option_ignore_line) {
741 $ignore = qr/^$ignore$/;
743 # Same for arch specific ignore lines.
744 if (scalar @option_ignore_arch_line > 0) {
745 foreach my $ignore (@option_ignore_arch_line) {
746 my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
748 if (not $ignore_arch or not $ignore_line) {
749 printf STDERR 'Value "%s" invalid for option ignore-arch-line '
750 . '("arch:line" expected)' . "\n", $ignore;
752 Pod::Usage::pod2usage(2);
755 push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
763 foreach my $file (@ARGV) {
764 print "checking '$file'...\n" if scalar @ARGV > 1;
766 -f $file or die "No such file: $file";
768 open my $fh, '<', $file or die $!;
770 # Architecture of this file.
771 my $arch = $option_arch;
773 # Hardening options. Not all architectures support all hardening options.
774 my $harden_format = 1;
775 my $harden_fortify = 1;
776 my $harden_stack = 1;
777 my $harden_stack_strong = 1;
778 my $harden_relro = 1;
779 my $harden_bindnow = $option_bindnow; # defaults to 0
780 my $harden_pie = $option_pie; # defaults to 0
782 # Number of parallel jobs to prevent false positives when detecting
783 # non-verbose builds. As not all jobs declare the number of parallel jobs
784 # use a large enough default.
787 # Don't check for PIE flags if automatically applied by the compiler. Only
788 # used in buildd and Debian mode.
789 my $disable_harden_pie = 0;
790 if ($option_debian) {
791 $disable_harden_pie = 1;
795 while (my $line = <$fh>) {
798 # Detect architecture automatically unless overridden. For buildd logs
799 # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
800 # build logs which aren't built (wrong architecture, build error,
803 if (index($line, 'Build Architecture: ') == 0) {
804 $arch = substr $line, 20, -1; # -1 to ignore '\n' at the end
805 # For old logs (sbuild << 0.63.0-1).
806 } elsif (index($line, 'Architecture: ') == 0) {
807 $arch = substr $line, 14, -1; # -1 to ignore '\n' at the end
811 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
812 # check for hardening flags in buildd mode if an older dpkg-dev is
813 # used. Default flags (-g -O2) are still checked.
815 # Packages which were built before 1.16.1 but used their own hardening
816 # flags are not checked.
818 # Strong stack protector is used since dpkg 1.17.11.
820 # Recent GCC versions automatically use PIE (only on supported
821 # architectures) and dpkg respects this properly since 1.18.15 and
822 # doesn't pass PIE flags manually.
824 and index($line, 'Toolchain package versions: ') == 0) {
825 require Dpkg::Version;
828 my $disable_strong = 1;
830 if ($line =~ /\bdpkg-dev_(\S+)/) {
831 if (Dpkg::Version::version_compare($1, '1.16.1') >= 0) {
834 if (Dpkg::Version::version_compare($1, '1.17.11') >= 0) {
837 if (Dpkg::Version::version_compare($1, '1.18.15') >= 0) {
838 $disable_harden_pie = 1;
850 if ($disable_strong) {
851 $harden_stack_strong = 0;
855 # The following two versions of CMake in Debian obeyed CPPFLAGS, but
856 # this was later dropped because upstream rejected the patch. Thus
857 # build logs with these versions will have fortify hardening flags
858 # enabled, even though they may be not correctly set and are missing
859 # when build with later CMake versions. Thanks to Aron Xu for letting
861 if (index($line, 'Package versions: ') == 0
862 and $line =~ /\bcmake_(\S+)/
863 and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
864 if (not $option_buildd) {
865 error_invalid_cmake($1);
866 $exit |= $exit_code{invalid_cmake};
868 print "$buildd_tag{invalid_cmake}|$1|\n";
872 # Debian's build daemons use "Filtered Build-Depends:" (or just
873 # "Build-Depends:" in older versions) for the build dependencies, but
874 # pbuilder uses "Depends:"; support both.
875 if (index($line, 'Filtered Build-Depends: ') == 0
876 or index($line, 'Build-Depends: ') == 0
877 or index($line, 'Depends: ') == 0) {
878 # If hardening wrapper is used (wraps calls to gcc and adds
879 # hardening flags automatically) we can't perform any checks,
881 if ($line =~ /\bhardening-wrapper\b/) {
882 if (not $option_buildd) {
883 error_hardening_wrapper();
884 $exit |= $exit_code{hardening_wrapper};
886 print "$buildd_tag{hardening_wrapper}||\n";
892 # This flags is not always available, but if it is use it.
893 if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
897 # We skip over unimportant lines at the beginning of the log to
898 # prevent false positives.
899 last if index($line, 'dpkg-buildpackage: ') == 0;
902 # Input lines, contain only the lines with compiler commands.
904 # Non-verbose lines in the input. Used to reduce calls to
905 # is_non_verbose_build() (which is quite slow) in the second loop when
906 # it's already clear if a line is non-verbose or not.
907 my @input_nonverbose = ();
909 my @input_number = ();
911 my $continuation = 0;
912 my $complete_line = undef;
914 while (my $line = <$fh>) {
917 # And stop at the end of the build log. Package details (reported by
918 # the buildd logs) are not important for us. This also prevents false
920 last if index($line, 'Build finished at ') == 0
921 and $line =~ /^Build finished at \d{8}-\d{4}$/;
923 if (not $continuation) {
927 # Detect architecture automatically unless overridden.
929 and index($line, 'dpkg-buildpackage: info: host architecture ') == 0) {
930 $arch = substr $line, 43, -1; # -1 to ignore '\n' at the end
931 # Older versions of dpkg-buildpackage
933 and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
934 $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
936 # Old buildd logs use e.g. "host architecture is alpha", remove
937 # the "is", otherwise debarch_to_debtriplet() will not detect the
939 if (index($arch, 'is ') == 0) {
940 $arch = substr $arch, 3;
944 # Permit dynamic excludes from within the build log to ignore false
945 # positives. Cannot use a separate config file as we often only have
946 # the build log itself.
947 if (index($line, 'blhc: ignore-line-regexp: ') == 0) {
948 my $ignore = substr $line, 26, -1; # -1 to ignore '\n' at the end
949 push @option_ignore_line, qr/^$ignore$/;
953 next if $line =~ /^\s*#/;
954 # Ignore compiler warnings for now.
955 next if $line =~ /$warning_regex/o;
957 if (not $option_buildd and index($line, "\033") != -1) { # \033 = esc
958 # Remove all ANSI color sequences which are sometimes used in
959 # non-verbose builds.
960 $line = Term::ANSIColor::colorstrip($line);
961 # Also strip '\0xf' (delete previous character), used by Elinks'
964 # And "ESC(B" which seems to be used on armhf and hurd (not sure
966 $line =~ s/\033\(B//g;
969 # Check if this line indicates a non verbose build.
971 $non_verbose |= is_non_verbose_build($line, \$skip);
974 # One line may contain multiple commands (";"). Treat each one as
975 # single line. parse_line() is slow, only use it when necessary.
976 my @line = (index($line, ';') == -1)
979 # Ensure newline at the line end - necessary for
980 # correct parsing later.
983 } Text::ParseWords::parse_line(';', 1, $line);
984 foreach my $line (@line) {
988 # Join lines, but leave the "\" in place so it's clear where
989 # the original line break was.
990 chomp $complete_line;
991 $complete_line .= ' ' . $line;
993 # Line continuation, line ends with "\".
994 if ($line =~ /\\$/) {
996 # Start line continuation.
997 if (not defined $complete_line) {
998 $complete_line = $line;
1003 # Use the complete line if a line continuation occurred.
1004 if (defined $complete_line) {
1005 $line = $complete_line;
1006 $complete_line = undef;
1009 # Ignore lines with no compiler commands.
1010 next if not $non_verbose
1011 and not $line =~ /$cc_regex_normal/o;
1012 # Ignore lines with no filenames with extensions. May miss some
1013 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
1014 # a problem as the log will most likely contain other non-verbose
1015 # commands which are detected.
1016 next if not $non_verbose
1017 and not $line =~ /$file_extension_regex/o;
1019 # Ignore false positives.
1021 # `./configure` output.
1022 next if not $non_verbose
1023 and $line =~ /^(?:checking|[Cc]onfigure:) /;
1024 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
1025 [Cc]ompiler[\s.]*:?\s+
1027 next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
1028 \s*=\s*$cc_regex_full
1029 # optional compiler options, don't allow
1030 # "everything" here to prevent false negatives
1031 \s*(?:\s-\S+)*\s*$}xo;
1032 # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
1033 # line (or similar for other architectures) which gets recognized
1034 # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
1035 # C++ files. No hardening flags are relevant during this step,
1036 # thus ignore `moc-qt*` lines. The resulting files will be
1037 # compiled in a separate step (and therefore checked).
1038 next if $line =~ m{^\S+/bin/moc(?:-qt[45])?
1040 -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
1042 # Ignore false positives when the line contains only CC=gcc but no
1043 # other gcc command.
1044 if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
1047 next if not $before =~ /$cc_regex_normal/o
1048 and not $after =~ /$cc_regex_normal/o;
1050 # Ignore false positives caused by gcc -v. It outputs a line
1051 # looking like a normal compiler line but which is sometimes
1052 # missing hardening flags, although the normal compiler line
1054 next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
1055 [0-9.]+/cc1(?:plus)?}xo;
1056 # Ignore false positive with `rm` which may remove files which
1057 # look like a compiler executable thus causing the line to be
1058 # treated as a normal compiler line.
1059 next if $line =~ m{^\s*rm\s+};
1060 next if $line =~ m{^\s*dwz\s+};
1061 # Some build systems emit "gcc > file".
1062 next if $line =~ m{$cc_regex_normal\s*>\s*\S+}o;
1063 # Hex output may contain "cc".
1064 next if $line =~ m#(?:\b[0-9a-fA-F]{2,}\b\s*){5}#;
1065 # Meson build output
1066 next if $line =~ /^C\+\+ linker for the host machine: /;
1067 # Embedded `gcc -print-*` commands
1068 next if $line =~ /`$cc_regex_normal\s*[^`]*-print-\S+`/;
1070 # Check if additional hardening options were used. Used to ensure
1071 # they are used for the complete build.
1072 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie,
1074 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
1077 push @input_nonverbose, $non_verbose;
1078 push @input_number, $number if $option_line_numbers;
1082 close $fh or die $!;
1084 # Ignore arch if requested.
1085 if (scalar @option_ignore_arch > 0 and $arch) {
1086 foreach my $ignore (@option_ignore_arch) {
1087 if ($arch eq $ignore) {
1088 print "ignoring architecture '$arch'\n";
1094 if (scalar @input == 0) {
1095 if (not $option_buildd) {
1096 print "No compiler commands!\n";
1097 $exit |= $exit_code{no_compiler_commands};
1099 print "$buildd_tag{no_compiler_commands}||\n";
1104 if ($option_buildd) {
1105 $statistics{commands} += scalar @input;
1108 # Option or auto detected.
1110 # The following was partially copied from dpkg-dev 1.20.5
1111 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, _add_build_flags()),
1112 # copyright Raphaël Hertzog <hertzog@debian.org>, Guillem Jover
1113 # <guillem@debian.org>, Kees Cook <kees@debian.org>, Canonical, Ltd.
1114 # licensed under GPL version 2 or later. Keep it in sync.
1118 # Recent dpkg versions use a quadruplet for arch. Support both.
1120 (undef, undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
1123 (undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
1126 my %builtin_pie_arch = map { $_ => 1 } qw(
1147 # Disable unsupported hardening options.
1148 if ($os !~ /^(?:linux|kfreebsd|knetbsd|hurd)$/
1149 or $cpu =~ /^(?:hppa|avr32)$/) {
1152 if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
1154 $harden_stack_strong = 0;
1156 if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
1158 $harden_bindnow = 0;
1161 if ($disable_harden_pie and exists $builtin_pie_arch{$arch}) {
1167 my @cflags = @def_cflags;
1168 my @cxxflags = @def_cxxflags;
1169 my @cppflags = @def_cppflags;
1170 my @ldflags = @def_ldflags;
1171 # Check the specified hardening options, same order as dpkg-buildflags.
1173 @cflags = (@cflags, @def_cflags_pie);
1174 @cxxflags = (@cxxflags, @def_cflags_pie);
1175 @ldflags = (@ldflags, @def_ldflags_pie);
1177 if ($harden_stack_strong) {
1178 @cflags = (@cflags, @def_cflags_stack_strong);
1179 @cxxflags = (@cxxflags, @def_cflags_stack_strong);
1180 } elsif ($harden_stack) {
1181 @cflags = (@cflags, @def_cflags_stack);
1182 @cxxflags = (@cxxflags, @def_cflags_stack);
1184 if ($harden_fortify) {
1185 @cflags = (@cflags, @def_cflags_fortify);
1186 @cxxflags = (@cxxflags, @def_cflags_fortify);
1187 @cppflags = (@cppflags, @def_cppflags_fortify);
1189 if ($harden_format) {
1190 @cflags = (@cflags, @def_cflags_format);
1191 @cxxflags = (@cxxflags, @def_cflags_format);
1193 if ($harden_relro) {
1194 @ldflags = (@ldflags, @def_ldflags_relro);
1196 if ($harden_bindnow) {
1197 @ldflags = (@ldflags, @def_ldflags_bindnow);
1200 # Ada doesn't support format hardening flags, see #680117 for more
1201 # information. Same for fortran.
1203 my @cflags_noformat = grep {
1205 foreach my $flag (@def_cflags_format) {
1206 $ok = 0 if $_ eq $flag;
1211 # Hack to fix cppflags_fortify_broken() if --ignore-flag
1212 # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
1213 # as long as @def_cppflags_fortify contains only one variable.
1214 if (scalar @def_cppflags_fortify == 0) {
1215 $harden_fortify = 0;
1218 # Ignore flags for this arch if requested.
1219 if ($arch and exists $option_ignore_arch_flag{$arch}) {
1220 my @local_flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
1222 remove_flags(\@local_flag_refs,
1224 @{$option_ignore_arch_flag{$arch}});
1227 my @ignore_line = @option_ignore_line;
1228 # Ignore lines for this arch if requested.
1229 if ($arch and exists $option_ignore_arch_line{$arch}) {
1230 @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
1234 for (my $i = 0; $i < scalar @input; $i++) {
1235 my $line = $input[$i];
1237 # Ignore line if requested.
1238 foreach my $ignore (@ignore_line) {
1239 next LINE if $line =~ /$ignore/;
1243 if ($input_nonverbose[$i]
1244 and is_non_verbose_build($line, \$skip,
1245 \@input, $i, $parallel)) {
1246 if (not $option_buildd) {
1247 error_non_verbose_build($line, $input_number[$i]);
1248 $exit |= $exit_code{non_verbose_build};
1250 $statistics{commands_nonverbose}++;
1254 # Even if it's a verbose build, we might have to skip this line (see
1255 # is_non_verbose_build()).
1258 my $orig_line = $line;
1260 # Remove everything until and including the compiler command. Makes
1261 # checks easier and faster.
1262 $line =~ s/^.*?$cc_regex//o;
1263 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
1264 # the brace and similar characters at the line end.
1265 $line =~ s/['")]+$//;
1267 # Skip unnecessary tests when only preprocessing.
1268 my $flag_preprocess = 0;
1275 # Preprocess, compile, assemble.
1276 if ($line =~ /\s(-E|-S|-c)\b/) {
1278 $flag_preprocess = 1 if $1 eq '-E';
1279 $compile = 1 if $1 eq '-S' or $1 eq '-c';
1280 # Dependency generation for Makefiles. The other flags (-MF -MG -MP
1281 # -MT -MQ) are always used with -M/-MM.
1282 } elsif ($line =~ /\s(?:-M|-MM)\b/) {
1284 # Otherwise assume we are linking.
1289 # -MD/-MMD also cause dependency generation, but they don't imply -E!
1290 if ($line =~ /\s(?:-MD|-MMD)\b/) {
1292 $flag_preprocess = 0;
1295 # Dependency generation for Makefiles, no preprocessing or other flags
1297 next if $dependency;
1299 # Get all file extensions on this line.
1300 my @extensions = $line =~ /$file_extension_regex/go;
1301 # Ignore all unknown extensions to speedup the search below.
1302 @extensions = grep { exists $extension{$_} } @extensions;
1304 # These file types don't require preprocessing.
1305 if (extension_found(\%extensions_no_preprocess, @extensions)) {
1308 # These file types require preprocessing.
1309 if (extension_found(\%extensions_preprocess, @extensions)) {
1310 # Prevent false positives with "libtool: link: g++ -include test.h
1311 # .." compiler lines.
1312 if ($orig_line !~ /$libtool_link_regex/o) {
1317 if (not $flag_preprocess) {
1318 # If there are source files then it's compiling/linking in one
1319 # step and we must check both. We only check for source files
1320 # here, because header files cause too many false positives.
1321 if (extension_found(\%extensions_compile_link, @extensions)) {
1322 # Assembly files don't need CFLAGS.
1323 if (not extension_found(\%extensions_compile, @extensions)
1324 and extension_found(\%extensions_no_compile, @extensions)) {
1326 # But the rest does.
1330 # No compilable extensions found, either linking or compiling
1333 # If there are also no object files we are just compiling headers
1334 # (.h -> .h.gch). Don't check for linker flags in this case. Due
1335 # to our liberal checks for compiler lines, this also reduces the
1336 # number of false positives considerably.
1338 and not extension_found(\%extensions_object, @extensions)) {
1343 my $compile_cpp = 0;
1344 my $restore_cflags = 0;
1345 # Assume CXXFLAGS are required when a C++ file is specified in the
1348 and extension_found(\%extensions_compile_cpp, @extensions)) {
1351 # Ada needs special CFLAGS
1352 } elsif (extension_found(\%extensions_ada, @extensions)) {
1353 $restore_cflags = 1;
1354 $preprocess = 0; # Ada uses no CPPFLAGS
1355 @cflags_backup = @cflags;
1356 @cflags = @cflags_noformat;
1358 } elsif (extension_found(\%extensions_fortran, @extensions)) {
1359 $restore_cflags = 1;
1360 @cflags_backup = @cflags;
1361 @cflags = @cflags_noformat;
1364 if ($option_buildd) {
1365 $statistics{preprocess}++ if $preprocess;
1366 $statistics{compile}++ if $compile;
1367 $statistics{compile_cpp}++ if $compile_cpp;
1368 $statistics{link}++ if $link;
1371 # Check if there are flags indicating a debug build. If that's true,
1372 # skip the check for -O2. This prevents fortification, but that's fine
1373 # for a debug build.
1374 if (any_flags_used($line, @def_cflags_debug)) {
1375 remove_flags([\@cflags], \%flag_renames, $def_cflags[1]);
1376 remove_flags([\@cppflags], \%flag_renames, $def_cppflags_fortify[0]);
1379 # Check hardening flags.
1381 if ($compile and (not all_flags_used($line, \@missing, @cflags)
1382 or (($harden_stack or $harden_stack_strong)
1383 and cflags_stack_broken($line, \@missing,
1384 $harden_stack_strong)))
1385 # Libraries linked with -fPIC don't have to (and can't) be
1386 # linked with -fPIE as well. It's no error if only PIE flags
1388 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1389 # Assume dpkg-buildflags returns the correct flags.
1390 and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
1391 if (not $option_buildd) {
1392 error_flags('CFLAGS missing', \@missing, \%flag_renames,
1393 $input[$i], $input_number[$i]);
1394 $exit |= $exit_code{flags_missing};
1396 $statistics{compile_missing}++;
1398 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
1399 # Libraries linked with -fPIC don't have to (and can't) be
1400 # linked with -fPIE as well. It's no error if only PIE flags
1402 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
1403 # Assume dpkg-buildflags returns the correct flags.
1404 and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
1405 if (not $option_buildd) {
1406 error_flags('CXXFLAGS missing', \@missing, \%flag_renames,
1407 $input[$i], $input_number[$i]);
1408 $exit |= $exit_code{flags_missing};
1410 $statistics{compile_cpp_missing}++;
1414 and (not all_flags_used($line, \@missing, @cppflags)
1415 # The fortify flag might be overwritten, detect that.
1417 and cppflags_fortify_broken($line, \@missing)))
1418 # Assume dpkg-buildflags returns the correct flags.
1419 and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
1420 if (not $option_buildd) {
1421 error_flags('CPPFLAGS missing', \@missing, \%flag_renames,
1422 $input[$i], $input_number[$i]);
1423 $exit |= $exit_code{flags_missing};
1425 $statistics{preprocess_missing}++;
1428 if ($link and not all_flags_used($line, \@missing, @ldflags)
1429 # Same here, -fPIC conflicts with -fPIE.
1430 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
1431 # Assume dpkg-buildflags returns the correct flags.
1432 and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
1433 if (not $option_buildd) {
1434 error_flags('LDFLAGS missing', \@missing, \%flag_renames,
1435 $input[$i], $input_number[$i]);
1436 $exit |= $exit_code{flags_missing};
1438 $statistics{link_missing}++;
1442 # Restore normal CFLAGS.
1443 if ($restore_cflags) {
1444 @cflags = @cflags_backup;
1449 # Print statistics for buildd mode, only output in this mode.
1450 if ($option_buildd) {
1453 if ($statistics{preprocess_missing}) {
1454 push @warning, sprintf 'CPPFLAGS %d (of %d)',
1455 $statistics{preprocess_missing},
1456 $statistics{preprocess};
1458 if ($statistics{compile_missing}) {
1459 push @warning, sprintf 'CFLAGS %d (of %d)',
1460 $statistics{compile_missing},
1461 $statistics{compile};
1463 if ($statistics{compile_cpp_missing}) {
1464 push @warning, sprintf 'CXXFLAGS %d (of %d)',
1465 $statistics{compile_cpp_missing},
1466 $statistics{compile_cpp};
1468 if ($statistics{link_missing}) {
1469 push @warning, sprintf 'LDFLAGS %d (of %d)',
1470 $statistics{link_missing},
1473 if (scalar @warning) {
1474 local $" = ', '; # array join string
1475 print "$buildd_tag{flags_missing}|@warning missing|\n";
1478 if ($statistics{commands_nonverbose}) {
1479 printf "$buildd_tag{non_verbose_build}|%d (of %d) hidden|\n",
1480 $statistics{commands_nonverbose},
1481 $statistics{commands},
1493 blhc - build log hardening check, checks build logs for missing hardening flags
1497 B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>
1501 blhc is a small tool which checks build logs for missing hardening flags. It's
1502 licensed under the GPL 3 or later.
1504 It's designed to check build logs generated by Debian's dpkg-buildpackage (or
1505 tools using dpkg-buildpackage like pbuilder or sbuild (which is used for the
1506 official buildd build logs)) to help maintainers detect missing hardening
1507 flags in their packages.
1509 Only gcc is detected as compiler at the moment. If other compilers support
1510 hardening flags as well, please report them.
1512 If there's no output, no flags are missing and the build log is fine.
1514 See F<README> for details about performed checks, auto-detection and
1517 =head1 FALSE POSITIVES
1519 To suppress false positives you can embed the following string in the build
1522 blhc: ignore-line-regexp: REGEXP
1524 All lines fully matching REGEXP (see B<--ignore-line> for details) will be
1527 Please use this feature sparingly so that missing flags are not overlooked. If
1528 you find false positives which affect more packages please report a bug.
1530 To generate this string simply use echo in C<debian/rules>; make sure to use @
1531 to suppress the echo command itself as it could also trigger a false positive.
1539 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
1542 =item B<--arch> I<architecture>
1544 Set the specific architecture (e.g. amd64, armel, etc.), automatically
1545 disables hardening flags not available on this architecture. Is detected
1546 automatically if dpkg-buildpackage is used.
1550 Force check for all +bindnow hardening flags. By default it's auto detected.
1554 Special mode for buildds when automatically parsing log files. The following
1555 changes are in effect:
1561 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1566 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1571 Don't require Term::ANSIColor.
1575 Return exit code 0, unless there was a error (-I, -W messages don't count as
1582 Apply Debian-specific settings. At the moment this only disables checking for
1583 PIE which is automatically applied by Debian's GCC and no longer requires a
1584 compiler command line argument.
1588 Use colored (ANSI) output for warning messages.
1590 =item B<--line-numbers>
1592 Display line numbers.
1594 =item B<--ignore-arch> I<arch>
1596 Ignore build logs from architectures matching I<arch>. I<arch> is a string.
1598 Used to prevent false positives. This option can be specified multiple times.
1600 =item B<--ignore-arch-flag> I<arch>:I<flag>
1602 Like B<--ignore-flag>, but only ignore flag on I<arch>.
1604 =item B<--ignore-arch-line> I<arch>:I<line>
1606 Like B<--ignore-line>, but only ignore line on I<arch>.
1608 =item B<--ignore-flag> I<flag>
1610 Don't print an error when the specific flag is missing in a compiler line.
1611 I<flag> is a string.
1613 Used to prevent false positives. This option can be specified multiple times.
1615 =item B<--ignore-line> I<regex>
1617 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1618 at the beginning and end of the line to prevent false negatives.
1620 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1621 warnings (which have line continuation resolved).
1623 Used to prevent false positives. This option can be specified multiple times.
1627 Force check for all +pie hardening flags. By default it's auto detected.
1629 =item B<-h -? --help>
1631 Print available options.
1635 Print version number and license.
1639 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1640 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1641 all other commands as well.
1645 Normal usage, parse a single log file.
1647 blhc path/to/log/file
1649 If there's no output, no flags are missing and the build log is fine.
1651 Parse multiple log files. The exit code is ORed over all files.
1653 blhc path/to/directory/with/log/files/*
1655 Don't treat missing C<-g> as error:
1657 blhc --ignore-flag -g path/to/log/file
1659 Don't treat missing C<-pie> on kfreebsd-amd64 as error:
1661 blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
1663 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1666 blhc --ignore-line '\./script gcc file' path/to/log/file
1668 Ignore lines matching C<./script gcc file> somewhere in the line.
1670 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1672 Use blhc with pbuilder.
1674 pbuilder path/to/package.dsc | tee path/log/file
1675 blhc path/to/file || echo flags missing
1677 Assume this build log was created on a Debian system and thus don't warn about
1678 missing PIE flags if the current architecture injects them automatically (this
1679 is enabled in buildd mode per default). C<--arch> is necessary if the build
1680 log contains no architecture information as written by dpkg-buildpackage.
1682 blhc --debian --all --arch=amd64 path/to/log/file
1686 The following tags are used in I<--buildd> mode. In braces the additional data
1691 =item B<I-hardening-wrapper-used>
1693 The package uses hardening-wrapper which intercepts calls to gcc and adds
1694 hardening flags. The build log doesn't contain any hardening flags and thus
1695 can't be checked by blhc.
1697 =item B<W-compiler-flags-hidden> (summary of hidden lines)
1699 Build log contains lines which hide the real compiler flags. For example:
1706 Most of the time either C<export V=1> or C<export verbose=1> in
1707 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1708 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1709 patched to remove the C<@>s hiding the real compiler commands.
1711 =item B<W-dpkg-buildflags-missing> (summary of missing flags)
1713 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1715 =item B<I-invalid-cmake-used> (version)
1717 By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
1718 patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
1719 patch was rejected by upstream and later reverted in Debian. Thus those two
1720 versions show correct usage of CPPFLAGS even if the package doesn't correctly
1721 handle them (for example by passing them to CFLAGS). To prevent false
1722 negatives just blacklist those two versions.
1724 =item B<I-no-compiler-commands>
1726 No compiler commands were detected. Either the log contains none or they were
1727 not correctly detected by blhc (please report the bug in this case).
1733 The exit status is a "bit mask", each listed status is ORed when the error
1734 condition occurs to get the result.
1744 No compiler commands were found.
1748 Invalid arguments/options given to blhc.
1756 Missing hardening flags.
1760 Hardening wrapper detected, no tests performed.
1764 Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
1765 TAGS"> for a detailed explanation.
1771 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1773 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1774 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1776 =head1 LICENSE AND COPYRIGHT
1778 Copyright (C) 2012-2020 by Simon Ruderich
1780 This program is free software: you can redistribute it and/or modify
1781 it under the terms of the GNU General Public License as published by
1782 the Free Software Foundation, either version 3 of the License, or
1783 (at your option) any later version.
1785 This program is distributed in the hope that it will be useful,
1786 but WITHOUT ANY WARRANTY; without even the implied warranty of
1787 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1788 GNU General Public License for more details.
1790 You should have received a copy of the GNU General Public License
1791 along with this program. If not, see <http://www.gnu.org/licenses/>.
1795 L<hardening-check(1)>, L<dpkg-buildflags(1)>