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 = '0.10';
32 # Regex to catch compiler commands.
34 (?<!\s-) # ignore options, e.g. "-c++" [sic!] (used by swig)
35 (?<!\.) # ignore file names, e.g. "test.gcc"
36 (?:cc|gcc|g\+\+|c\+\+|gfortran|mpicc|mpicxx|mpifort)
37 (?:-[\d.]+)? # version suffix, e.g. "gcc-4.6"
39 # Full regex which matches the complete compiler name. Used in a few places to
40 # prevent false negatives.
41 my $cc_regex_full_prefix = qr/
42 [a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?
44 my $cc_regex_full = qr/
45 (?:$cc_regex_full_prefix-)?
48 # Regex to check if a line contains a compiler command.
49 my $cc_regex_normal = qr/
52 # Regex to catch (GCC) compiler warnings.
53 my $warning_regex = qr/^(.+?):(\d+):\d+: warning: (.+?) \[(.+?)\]$/;
54 # Regex to catch libtool commands and not lines which show commands executed
55 # by libtool (e.g. libtool: link: ...).
56 my $libtool_regex = qr/\blibtool["']?\s.*--mode=/;
57 my $libtool_link_regex = qr/\blibtool: link: /;
59 # List of source file extensions which require preprocessing.
60 my @source_preprocess_compile_cpp = (
62 qw( cc cp cxx cpp CPP c++ C ),
66 my @source_preprocess_compile_fortran = (
68 qw( F FOR fpp FPP FTN F90 F95 F03 F08 ),
70 my @source_preprocess_compile = (
76 @source_preprocess_compile_cpp,
78 @source_preprocess_compile_fortran,
80 my @source_preprocess_no_compile = (
84 my @source_preprocess = (
85 @source_preprocess_compile,
86 @source_preprocess_no_compile,
88 # List of source file extensions which don't require preprocessing.
89 my @source_no_preprocess_compile_cpp = (
95 my @source_no_preprocess_compile_ada = (
101 my @source_no_preprocess_compile_fortran = (
103 qw( f for ftn f90 f95 f03 f08 ),
105 my @source_no_preprocess_compile = (
109 @source_no_preprocess_compile_cpp,
113 @source_no_preprocess_compile_fortran,
115 @source_no_preprocess_compile_ada,
117 my @source_no_preprocess_no_compile_ada = (
121 my @source_no_preprocess_no_compile = (
125 @source_no_preprocess_no_compile_ada,
127 my @source_no_preprocess = (
128 @source_no_preprocess_compile,
129 @source_no_preprocess_no_compile,
131 # List of header file extensions which require preprocessing.
132 my @header_preprocess = (
133 # C, C++, Objective-C, Objective-C++
136 qw( hh H hp hxx hpp HPP h++ tcc ),
140 # Normal object files.
142 # Libtool object files.
144 # Dynamic libraries. bzip2 uses .sho.
150 # Hashes for fast extensions lookup to check if a file falls in one of these
152 my %extensions_no_preprocess = map { $_ => 1 } (
153 # There's no @header_no_preprocess.
154 @source_no_preprocess,
156 my %extensions_preprocess = map { $_ => 1 } (
160 my %extensions_compile_link = map { $_ => 1 } (
162 @source_no_preprocess,
164 my %extensions_compile = map { $_ => 1 } (
165 @source_preprocess_compile,
166 @source_no_preprocess_compile,
168 my %extensions_no_compile = map { $_ => 1 } (
169 @source_preprocess_no_compile,
170 @source_no_preprocess_no_compile,
172 my %extensions_compile_cpp = map { $_ => 1 } (
173 @source_preprocess_compile_cpp,
174 @source_no_preprocess_compile_cpp,
176 my %extensions_ada = map { $_ => 1 } (
177 @source_no_preprocess_compile_ada,
178 @source_no_preprocess_no_compile_ada,
180 my %extensions_fortran = map { $_ => 1 } (
181 @source_no_preprocess_compile_fortran,
182 @source_preprocess_compile_fortran,
184 my %extensions_object = map { $_ => 1 } (
187 my %extension = map { $_ => 1 } (
188 @source_no_preprocess,
194 # Regexp to match file extensions.
195 my $file_extension_regex = qr/
197 \S+ # Filename without extension.
199 ([^\/\\.,;:\s]+)# File extension.
200 (?=\s|\\) # At end of word. Can't use \b because some files have non
201 # word characters at the end and because \b matches double
202 # extensions (like .cpp.o). Works always as all lines are
203 # terminated with "\n".
206 # Expected (hardening) flags. All flags are used as regexps (and compiled to
207 # real regexps below for better execution speed).
210 '-O(?:2|3)', # keep at index 1, search for @def_cflags_debug to change it
212 my @def_cflags_debug = (
213 # These flags indicate a debug build which disables checks for -O2.
217 my @def_cflags_format = (
218 '-Wformat(?:=2)?', # -Wformat=2 implies -Wformat, accept it too
219 '-Werror=format-security', # implies -Wformat-security
221 my @def_cflags_fortify = (
222 # fortify needs at least -O1, but -O2 is recommended anyway
224 my @def_cflags_stack = (
225 '-fstack-protector', # keep first, used by cflags_stack_broken()
226 '--param[= ]ssp-buffer-size=4',
228 my @def_cflags_stack_strong = (
229 '-fstack-protector-strong', # keep first, used by cflags_stack_broken()
231 my @def_cflags_stack_bad = (
232 # Blacklist all stack protector options for simplicity.
233 '-fno-stack-protector',
234 '-fno-stack-protector-all',
235 '-fno-stack-protector-strong',
237 my @def_cflags_pie = (
243 # @def_cxxflags_* is the same as @def_cflags_*.
244 my @def_cppflags = ();
245 my @def_cppflags_fortify = (
246 '-D_FORTIFY_SOURCE=2', # must be first, see cppflags_fortify_broken()
247 # If you add another flag fix hack below (search for "Hack to fix") and
248 # $def_cppflags_fortify[0].
250 my @def_cppflags_fortify_bad = (
251 # These flags may overwrite -D_FORTIFY_SOURCE=2.
253 '-D_FORTIFY_SOURCE=0',
254 '-D_FORTIFY_SOURCE=1',
256 my @def_ldflags = ();
257 my @def_ldflags_relro = (
260 my @def_ldflags_bindnow = (
263 my @def_ldflags_pie = (
267 my @def_ldflags_pic = (
272 # References to all flags checked by the flag checker.
276 \@def_cflags_fortify,
278 \@def_cflags_stack_strong,
279 \@def_cflags_stack_bad,
283 \@def_cppflags_fortify,
286 \@def_ldflags_bindnow,
289 # References to all used flags.
290 my @flag_refs_all = (
293 \@def_cppflags_fortify_bad,
296 # Renaming rules for the output so the regex parts are not visible. Also
297 # stores string values of flag regexps above, see compile_flag_regexp().
299 '-O(?:2|3)' => '-O2',
300 '-Wformat(?:=2)?' => '-Wformat',
301 '--param[= ]ssp-buffer-size=4' => '--param=ssp-buffer-size=4',
302 '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
303 '-Wl,(?:-z,)?now' => '-Wl,-z,now',
307 no_compiler_commands => 1 << 0,
308 # used by POD::Usage => 1 << 1,
309 non_verbose_build => 1 << 2,
310 flags_missing => 1 << 3,
311 hardening_wrapper => 1 << 4,
312 invalid_cmake => 1 << 5,
316 no_compiler_commands => 'I-no-compiler-commands',
317 non_verbose_build => 'W-compiler-flags-hidden',
318 flags_missing => 'W-dpkg-buildflags-missing',
319 hardening_wrapper => 'I-hardening-wrapper-used',
320 invalid_cmake => 'I-invalid-cmake-used',
323 # Statistics of missing flags and non-verbose build commands. Used for
327 preprocess_missing => 0,
329 compile_missing => 0,
331 compile_cpp_missing => 0,
335 commands_nonverbose => 0,
338 # Use colored (ANSI) output?
344 # Only works for single-level arrays with no undef values. Thanks to perlfaq4.
346 my ($first_ref, $second_ref) = @_;
348 return 0 if scalar @{$first_ref} != scalar @{$second_ref};
350 my $length = scalar @{$first_ref};
351 for (my $i = 0; $i < $length; $i++) {
352 return 0 if $first_ref->[$i] ne $second_ref->[$i];
359 my ($message, $missing_flags_ref, $flag_renames_ref, $line, $number) = @_;
361 # Get string value of qr//-escaped regexps and if requested rename them.
362 my @missing_flags = map {
363 $flag_renames_ref->{$_}
364 } @{$missing_flags_ref};
366 my $flags = join ' ', @missing_flags;
367 printf '%d:', $number if defined $number;
368 printf '%s (%s)%s %s',
369 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
374 sub error_non_verbose_build {
375 my ($line, $number) = @_;
377 printf '%d:', $number if defined $number;
379 error_color('NONVERBOSE BUILD', 'red'),
380 error_color(':', 'yellow'),
385 sub error_invalid_cmake {
389 error_color('INVALID CMAKE', 'red'),
390 error_color(':', 'yellow'),
395 sub error_hardening_wrapper {
397 error_color('HARDENING WRAPPER', 'red'),
398 error_color(':', 'yellow'),
399 'no checks possible, aborting';
404 my ($message, $color) = @_;
407 return Term::ANSIColor::colored($message, $color);
414 my ($line, @flags) = @_;
416 foreach my $flag (@flags) {
417 return 1 if $line =~ /$flag/;
423 my ($line, $missing_flags_ref, @flags) = @_;
425 my @missing_flags = ();
426 foreach my $flag (@flags) {
427 if (not $line =~ /$flag/) {
428 push @missing_flags, $flag;
432 return 1 if scalar @missing_flags == 0;
434 @{$missing_flags_ref} = @missing_flags;
437 # Check if any of \@bad_flags occurs after $good_flag. Doesn't check if
438 # $good_flag is present.
439 sub flag_overwritten {
440 my ($line, $good_flag, $bad_flags) = @_;
442 if (not any_flags_used($line, @{$bad_flags})) {
447 foreach my $flag (@{$bad_flags}) {
448 while ($line =~ /$flag/g) {
449 if ($bad_pos < $+[0]) {
455 while ($line =~ /$good_flag/g) {
458 if ($good_pos > $bad_pos) {
464 sub cppflags_fortify_broken {
465 my ($line, $missing_flags) = @_;
467 # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
468 my $fortify_source = $def_cppflags_fortify[0];
470 # Some build systems enable/disable fortify source multiple times, check
472 if (not flag_overwritten($line,
474 \@def_cppflags_fortify_bad)) {
477 push @{$missing_flags}, $fortify_source;
481 sub cflags_stack_broken {
482 my ($line, $missing_flags, $strong) = @_;
484 my $flag = $strong ? $def_cflags_stack_strong[0]
485 : $def_cflags_stack[0];
487 if (not flag_overwritten($line, $flag, \@def_cflags_stack_bad)) {
490 push @{$missing_flags}, $flag;
494 # Modifies $missing_flags_ref array.
495 sub pic_pie_conflict {
496 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
498 return 0 if not $pie;
499 return 0 if not any_flags_used($line, @def_ldflags_pic);
501 my %flags = map { $_ => 1 } @flags_pie;
503 # Remove all PIE flags from @missing_flags as they are not required with
506 not exists $flags{$_}
507 } @{$missing_flags_ref};
508 @{$missing_flags_ref} = @result;
510 # We got a conflict when no flags are left, thus only PIE flags were
511 # missing. If other flags were missing abort because the conflict is not
513 return scalar @result == 0;
516 sub is_non_verbose_build {
517 my ($line, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
519 if ($line =~ /$libtool_regex/o) {
520 # libtool's --silent hides the real compiler flags.
521 if ($line =~ /\s--silent/) {
523 # If --silent is not present, skip this line as some compiler flags
524 # might be missing (e.g. -fPIE) which are handled correctly by libtool
525 # internally. libtool displays the real compiler command on the next
526 # line, so the flags are checked as usual.
533 if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
534 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
535 or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
536 or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
537 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
543 # C++ compiler setting.
544 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
545 return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
546 # "Compiling" non binary files.
547 return 0 if $line =~ /^\s*Compiling \S+\.(?:py|pyx|el)['"]?\s*(?:\.\.\.|because it changed\.)?$/;
548 return 0 if $line =~ /^\s*[Cc]ompiling catalog \S+\.po\b/;
549 # "Compiling" with no file name.
550 if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
551 # $file_extension_regex may need spaces around the filename.
552 return 0 if not " $1 " =~ /$file_extension_regex/o;
557 # On the first pass we only check if this line is verbose or not.
558 return 1 if not defined $input_ref;
560 # Second pass, we have access to the next lines.
563 # CMake and other build systems print the non-verbose messages also when
564 # building verbose. If a compiler and the file name occurs in the next
565 # lines, treat it as verbose build.
567 # Get filename, we can't use the complete path as only parts of it are
568 # used in the real compiler command.
569 $file =~ m{/([^/\s]+)$};
572 for (my $i = 1; $i <= $line_count; $i++) {
573 my $next_line = $input_ref->[$line_offset + $i];
574 last unless defined $next_line;
576 if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
577 # Not a non-verbose line, but we still have to skip the
578 # current line as it doesn't contain any compiler commands.
588 # Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
590 my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
592 my %removes = map { $_ => 1 } @flags;
593 foreach my $flags (@{$flag_refs_ref}) {
595 # Flag found as string.
596 not exists $removes{$_}
597 # Flag found as string representation of regexp.
598 and (not defined $flag_renames_ref->{$_}
599 or not exists $removes{$flag_renames_ref->{$_}})
606 # Modifies $flag_renames_ref hash.
607 sub compile_flag_regexp {
608 my ($flag_renames_ref, @flags) = @_;
611 foreach my $flag (@flags) {
612 # Compile flag regexp for faster execution.
613 my $regex = qr/\s$flag(?:\s|\\)/;
615 # Store flag name in replacement string for correct flags in messages
616 # with qr//ed flag regexps.
617 $flag_renames_ref->{$regex}
618 = (exists $flag_renames_ref->{$flag})
619 ? $flag_renames_ref->{$flag}
622 push @result, $regex;
627 # Does any extension in @extensions exist in %{$extensions_ref}?
628 sub extension_found {
629 my ($extensions_ref, @extensions) = @_;
631 foreach my $extension (@extensions) {
632 if (exists $extensions_ref->{$extension}) {
642 # Parse command line arguments.
644 my $option_version = 0;
646 my $option_bindnow = 0;
647 my @option_ignore_arch = ();
648 my @option_ignore_flag = ();
649 my @option_ignore_arch_flag = ();
650 my @option_ignore_line = ();
651 my @option_ignore_arch_line = ();
653 my $option_arch = undef;
654 my $option_buildd = 0;
655 my $option_debian = 0;
657 my $option_line_numbers = 0;
658 if (not Getopt::Long::GetOptions(
659 'help|h|?' => \$option_help,
660 'version' => \$option_version,
662 'pie' => \$option_pie,
663 'bindnow' => \$option_bindnow,
664 'all' => \$option_all,
666 'ignore-arch=s' => \@option_ignore_arch,
667 'ignore-flag=s' => \@option_ignore_flag,
668 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
669 'ignore-line=s' => \@option_ignore_line,
670 'ignore-arch-line=s' => \@option_ignore_arch_line,
672 'color' => \$option_color,
673 'arch=s' => \$option_arch,
674 'buildd' => \$option_buildd,
675 'debian' => \$option_debian,
676 'line-numbers' => \$option_line_numbers,
679 Pod::Usage::pod2usage(2);
683 Pod::Usage::pod2usage(1);
685 if ($option_version) {
687 blhc $VERSION Copyright (C) 2012-2020 Simon Ruderich
689 This program is free software: you can redistribute it and/or modify
690 it under the terms of the GNU General Public License as published by
691 the Free Software Foundation, either version 3 of the License, or
692 (at your option) any later version.
694 This program is distributed in the hope that it will be useful,
695 but WITHOUT ANY WARRANTY; without even the implied warranty of
696 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
697 GNU General Public License for more details.
699 You should have received a copy of the GNU General Public License
700 along with this program. If not, see <http://www.gnu.org/licenses/>.
706 if (scalar @ARGV == 0) {
708 Pod::Usage::pod2usage(2);
711 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
712 # installed on Debian's buildds.
713 if (not $option_buildd) {
714 require Term::ANSIColor;
722 # Precompiled ignores for faster lookup.
723 my %option_ignore_arch_flag = ();
724 my %option_ignore_arch_line = ();
726 # Strip flags which should be ignored.
727 if (scalar @option_ignore_flag > 0) {
728 remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
730 # Same for arch specific ignore flags, but only prepare here.
731 if (scalar @option_ignore_arch_flag > 0) {
732 foreach my $ignore (@option_ignore_arch_flag) {
733 my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
735 if (not $ignore_arch or not $ignore_flag) {
736 printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
737 . '("arch:flag" expected)' . "\n", $ignore;
739 Pod::Usage::pod2usage(2);
742 push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
746 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
748 foreach my $flags (@flag_refs_all) {
749 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
752 # Precompile ignore line regexps, also anchor at beginning and end of line.
753 foreach my $ignore (@option_ignore_line) {
754 $ignore = qr/^$ignore$/;
756 # Same for arch specific ignore lines.
757 if (scalar @option_ignore_arch_line > 0) {
758 foreach my $ignore (@option_ignore_arch_line) {
759 my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
761 if (not $ignore_arch or not $ignore_line) {
762 printf STDERR 'Value "%s" invalid for option ignore-arch-line '
763 . '("arch:line" expected)' . "\n", $ignore;
765 Pod::Usage::pod2usage(2);
768 push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
776 foreach my $file (@ARGV) {
777 print "checking '$file'...\n" if scalar @ARGV > 1;
779 -f $file or die "No such file: $file";
781 open my $fh, '<', $file or die $!;
783 # Architecture of this file.
784 my $arch = $option_arch;
786 # Hardening options. Not all architectures support all hardening options.
787 my $harden_format = 1;
788 my $harden_fortify = 1;
789 my $harden_stack = 1;
790 my $harden_stack_strong = 1;
791 my $harden_relro = 1;
792 my $harden_bindnow = $option_bindnow; # defaults to 0
793 my $harden_pie = $option_pie; # defaults to 0
795 # Number of parallel jobs to prevent false positives when detecting
796 # non-verbose builds. As not all jobs declare the number of parallel jobs
797 # use a large enough default.
800 # Don't check for PIE flags if automatically applied by the compiler. Only
801 # used in buildd and Debian mode.
802 my $disable_harden_pie = 0;
803 if ($option_debian) {
804 $disable_harden_pie = 1;
808 while (my $line = <$fh>) {
811 # Detect architecture automatically unless overridden. For buildd logs
812 # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
813 # build logs which aren't built (wrong architecture, build error,
816 if (index($line, 'Build Architecture: ') == 0) {
817 $arch = substr $line, 20, -1; # -1 to ignore '\n' at the end
818 # For old logs (sbuild << 0.63.0-1).
819 } elsif (index($line, 'Architecture: ') == 0) {
820 $arch = substr $line, 14, -1; # -1 to ignore '\n' at the end
824 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
825 # check for hardening flags in buildd mode if an older dpkg-dev is
826 # used. Default flags (-g -O2) are still checked.
828 # Packages which were built before 1.16.1 but used their own hardening
829 # flags are not checked.
831 # Strong stack protector is used since dpkg 1.17.11.
833 # Recent GCC versions automatically use PIE (only on supported
834 # architectures) and dpkg respects this properly since 1.18.15 and
835 # doesn't pass PIE flags manually.
837 and index($line, 'Toolchain package versions: ') == 0) {
838 require Dpkg::Version;
841 my $disable_strong = 1;
843 if ($line =~ /\bdpkg-dev_(\S+)/) {
844 if (Dpkg::Version::version_compare($1, '1.16.1') >= 0) {
847 if (Dpkg::Version::version_compare($1, '1.17.11') >= 0) {
850 if (Dpkg::Version::version_compare($1, '1.18.15') >= 0) {
851 $disable_harden_pie = 1;
863 if ($disable_strong) {
864 $harden_stack_strong = 0;
868 # The following two versions of CMake in Debian obeyed CPPFLAGS, but
869 # this was later dropped because upstream rejected the patch. Thus
870 # build logs with these versions will have fortify hardening flags
871 # enabled, even though they may be not correctly set and are missing
872 # when build with later CMake versions. Thanks to Aron Xu for letting
874 if (index($line, 'Package versions: ') == 0
875 and $line =~ /\bcmake_(\S+)/
876 and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
877 if (not $option_buildd) {
878 error_invalid_cmake($1);
879 $exit |= $exit_code{invalid_cmake};
881 print "$buildd_tag{invalid_cmake}|$1|\n";
885 # Debian's build daemons use "Filtered Build-Depends:" (or just
886 # "Build-Depends:" in older versions) for the build dependencies, but
887 # pbuilder uses "Depends:"; support both.
888 if (index($line, 'Filtered Build-Depends: ') == 0
889 or index($line, 'Build-Depends: ') == 0
890 or index($line, 'Depends: ') == 0) {
891 # If hardening wrapper is used (wraps calls to gcc and adds
892 # hardening flags automatically) we can't perform any checks,
894 if ($line =~ /\bhardening-wrapper\b/) {
895 if (not $option_buildd) {
896 error_hardening_wrapper();
897 $exit |= $exit_code{hardening_wrapper};
899 print "$buildd_tag{hardening_wrapper}||\n";
905 # This flags is not always available, but if it is use it.
906 if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
910 # We skip over unimportant lines at the beginning of the log to
911 # prevent false positives.
912 last if index($line, 'dpkg-buildpackage: ') == 0;
915 # Input lines, contain only the lines with compiler commands.
917 # Non-verbose lines in the input. Used to reduce calls to
918 # is_non_verbose_build() (which is quite slow) in the second loop when
919 # it's already clear if a line is non-verbose or not.
920 my @input_nonverbose = ();
922 my @input_number = ();
924 my $continuation = 0;
925 my $complete_line = undef;
927 while (my $line = <$fh>) {
930 # And stop at the end of the build log. Package details (reported by
931 # the buildd logs) are not important for us. This also prevents false
933 last if index($line, 'Build finished at ') == 0
934 and $line =~ /^Build finished at \d{8}-\d{4}$/;
936 if (not $continuation) {
940 # Detect architecture automatically unless overridden.
942 and index($line, 'dpkg-buildpackage: info: host architecture ') == 0) {
943 $arch = substr $line, 43, -1; # -1 to ignore '\n' at the end
944 # Older versions of dpkg-buildpackage
946 and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
947 $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
949 # Old buildd logs use e.g. "host architecture is alpha", remove
950 # the "is", otherwise debarch_to_debtriplet() will not detect the
952 if (index($arch, 'is ') == 0) {
953 $arch = substr $arch, 3;
957 next if $line =~ /^\s*#/;
958 # Ignore compiler warnings for now.
959 next if $line =~ /$warning_regex/o;
961 if (not $option_buildd and index($line, "\033") != -1) { # \033 = esc
962 # Remove all ANSI color sequences which are sometimes used in
963 # non-verbose builds.
964 $line = Term::ANSIColor::colorstrip($line);
965 # Also strip '\0xf' (delete previous character), used by Elinks'
968 # And "ESC(B" which seems to be used on armhf and hurd (not sure
970 $line =~ s/\033\(B//g;
973 # Check if this line indicates a non verbose build.
975 $non_verbose |= is_non_verbose_build($line, \$skip);
978 # One line may contain multiple commands (";"). Treat each one as
979 # single line. parse_line() is slow, only use it when necessary.
980 my @line = (index($line, ';') == -1)
983 # Ensure newline at the line end - necessary for
984 # correct parsing later.
987 } Text::ParseWords::parse_line(';', 1, $line);
988 foreach my $line (@line) {
992 # Join lines, but leave the "\" in place so it's clear where
993 # the original line break was.
994 chomp $complete_line;
995 $complete_line .= ' ' . $line;
997 # Line continuation, line ends with "\".
998 if ($line =~ /\\$/) {
1000 # Start line continuation.
1001 if (not defined $complete_line) {
1002 $complete_line = $line;
1007 # Use the complete line if a line continuation occurred.
1008 if (defined $complete_line) {
1009 $line = $complete_line;
1010 $complete_line = undef;
1013 # Ignore lines with no compiler commands.
1014 next if not $non_verbose
1015 and not $line =~ /$cc_regex_normal/o;
1016 # Ignore lines with no filenames with extensions. May miss some
1017 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
1018 # a problem as the log will most likely contain other non-verbose
1019 # commands which are detected.
1020 next if not $non_verbose
1021 and not $line =~ /$file_extension_regex/o;
1023 # Ignore false positives.
1025 # `./configure` output.
1026 next if not $non_verbose
1027 and $line =~ /^(?:checking|[Cc]onfigure:) /;
1028 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
1029 [Cc]ompiler[\s.]*:?\s+
1031 next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
1032 \s*=\s*$cc_regex_full
1033 # optional compiler options, don't allow
1034 # "everything" here to prevent false negatives
1035 \s*(?:\s-\S+)*\s*$}xo;
1036 # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
1037 # line (or similar for other architectures) which gets recognized
1038 # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
1039 # C++ files. No hardening flags are relevant during this step,
1040 # thus ignore `moc-qt*` lines. The resulting files will be
1041 # compiled in a separate step (and therefore checked).
1042 next if $line =~ m{^\S+/bin/moc(?:-qt[45])?
1044 -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
1046 # Ignore false positives when the line contains only CC=gcc but no
1047 # other gcc command.
1048 if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
1051 next if not $before =~ /$cc_regex_normal/o
1052 and not $after =~ /$cc_regex_normal/o;
1054 # Ignore false positives caused by gcc -v. It outputs a line
1055 # looking like a normal compiler line but which is sometimes
1056 # missing hardening flags, although the normal compiler line
1058 next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
1059 [0-9.]+/cc1(?:plus)?}xo;
1060 # Ignore false positive with `rm` which may remove files which
1061 # look like a compiler executable thus causing the line to be
1062 # treated as a normal compiler line.
1063 next if $line =~ m{^\s*rm\s+};
1064 next if $line =~ m{^\s*dwz\s+};
1065 # Some build systems emit "gcc > file".
1066 next if $line =~ m{$cc_regex_normal\s*>\s*\S+}o;
1067 # Hex output may contain "cc".
1068 next if $line =~ m#(?:\b[0-9a-fA-F]{2,}\b\s*){5}#;
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 1.19.7
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
1523 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
1526 =item B<--arch> I<architecture>
1528 Set the specific architecture (e.g. amd64, armel, etc.), automatically
1529 disables hardening flags not available on this architecture. Is detected
1530 automatically if dpkg-buildpackage is used.
1534 Force check for all +bindnow hardening flags. By default it's auto detected.
1538 Special mode for buildds when automatically parsing log files. The following
1539 changes are in effect:
1545 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1550 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1555 Don't require Term::ANSIColor.
1559 Return exit code 0, unless there was a error (-I, -W messages don't count as
1566 Apply Debian-specific settings. At the moment this only disables checking for
1567 PIE which is automatically applied by Debian's GCC and no longer requires a
1568 compiler command line argument.
1572 Use colored (ANSI) output for warning messages.
1574 =item B<--line-numbers>
1576 Display line numbers.
1578 =item B<--ignore-arch> I<arch>
1580 Ignore build logs from architectures matching I<arch>. I<arch> is a string.
1582 Used to prevent false positives. This option can be specified multiple times.
1584 =item B<--ignore-arch-flag> I<arch>:I<flag>
1586 Like B<--ignore-flag>, but only ignore flag on I<arch>.
1588 =item B<--ignore-arch-line> I<arch>:I<line>
1590 Like B<--ignore-line>, but only ignore line on I<arch>.
1592 =item B<--ignore-flag> I<flag>
1594 Don't print an error when the specific flag is missing in a compiler line.
1595 I<flag> is a string.
1597 Used to prevent false positives. This option can be specified multiple times.
1599 =item B<--ignore-line> I<regex>
1601 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1602 at the beginning and end of the line to prevent false negatives.
1604 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1605 warnings (which have line continuation resolved).
1607 Used to prevent false positives. This option can be specified multiple times.
1611 Force check for all +pie hardening flags. By default it's auto detected.
1613 =item B<-h -? --help>
1615 Print available options.
1619 Print version number and license.
1623 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1624 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1625 all other commands as well.
1629 Normal usage, parse a single log file.
1631 blhc path/to/log/file
1633 If there's no output, no flags are missing and the build log is fine.
1635 Parse multiple log files. The exit code is ORed over all files.
1637 blhc path/to/directory/with/log/files/*
1639 Don't treat missing C<-g> as error:
1641 blhc --ignore-flag -g path/to/log/file
1643 Don't treat missing C<-pie> on kfreebsd-amd64 as error:
1645 blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
1647 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1650 blhc --ignore-line '\./script gcc file' path/to/log/file
1652 Ignore lines matching C<./script gcc file> somewhere in the line.
1654 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1656 Use blhc with pbuilder.
1658 pbuilder path/to/package.dsc | tee path/log/file
1659 blhc path/to/file || echo flags missing
1661 Assume this build log was created on a Debian system and thus don't warn about
1662 missing PIE flags if the current architecture injects them automatically (this
1663 is enabled in buildd mode per default). C<--arch> is necessary if the build
1664 log contains no architecture information as written by dpkg-buildpackage.
1666 blhc --debian --all --arch=amd64 path/to/log/file
1670 The following tags are used in I<--buildd> mode. In braces the additional data
1675 =item B<I-hardening-wrapper-used>
1677 The package uses hardening-wrapper which intercepts calls to gcc and adds
1678 hardening flags. The build log doesn't contain any hardening flags and thus
1679 can't be checked by blhc.
1681 =item B<W-compiler-flags-hidden> (summary of hidden lines)
1683 Build log contains lines which hide the real compiler flags. For example:
1690 Most of the time either C<export V=1> or C<export verbose=1> in
1691 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1692 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1693 patched to remove the C<@>s hiding the real compiler commands.
1695 =item B<W-dpkg-buildflags-missing> (summary of missing flags)
1697 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1699 =item B<I-invalid-cmake-used> (version)
1701 By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
1702 patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
1703 patch was rejected by upstream and later reverted in Debian. Thus those two
1704 versions show correct usage of CPPFLAGS even if the package doesn't correctly
1705 handle them (for example by passing them to CFLAGS). To prevent false
1706 negatives just blacklist those two versions.
1708 =item B<I-no-compiler-commands>
1710 No compiler commands were detected. Either the log contains none or they were
1711 not correctly detected by blhc (please report the bug in this case).
1717 The exit status is a "bit mask", each listed status is ORed when the error
1718 condition occurs to get the result.
1728 No compiler commands were found.
1732 Invalid arguments/options given to blhc.
1740 Missing hardening flags.
1744 Hardening wrapper detected, no tests performed.
1748 Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
1749 TAGS"> for a detailed explanation.
1755 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1757 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1758 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1760 =head1 LICENSE AND COPYRIGHT
1762 Copyright (C) 2012-2020 by Simon Ruderich
1764 This program is free software: you can redistribute it and/or modify
1765 it under the terms of the GNU General Public License as published by
1766 the Free Software Foundation, either version 3 of the License, or
1767 (at your option) any later version.
1769 This program is distributed in the hope that it will be useful,
1770 but WITHOUT ANY WARRANTY; without even the implied warranty of
1771 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1772 GNU General Public License for more details.
1774 You should have received a copy of the GNU General Public License
1775 along with this program. If not, see <http://www.gnu.org/licenses/>.
1779 L<hardening-check(1)>, L<dpkg-buildflags(1)>