3 # Build log hardening check, checks build logs for missing hardening flags.
5 # Copyright (C) 2012 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 = '0.01';
32 # Regex to catch compiler commands.
34 (?<!\.) # ignore file names, e.g. "test.gcc"
35 (?:cc|gcc|g\+\+|c\+\+)
36 (?:-[\d.]+)? # version suffix, e.g. "gcc-4.6"
38 # Full regex which matches the complete compiler name. Used in a few places to
39 # prevent false negatives.
40 my $cc_regex_full = qr/
41 (?:[a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?-)?
44 # Regex to catch (GCC) compiler warnings.
45 my $warning_regex = qr/^(.+?):([0-9]+):[0-9]+: warning: (.+?) \[(.+?)\]$/;
47 # List of source file extensions which require preprocessing.
48 my @source_preprocess_compile_cpp = (
50 qw( cc cp cxx cpp CPP c++ C ),
54 my @source_preprocess_compile = (
60 @source_preprocess_compile_cpp,
62 qw( F FOR fpp FPP FTN F90 F95 F03 F08 ),
64 my @source_preprocess_no_compile = (
68 my @source_preprocess = (
69 @source_preprocess_compile,
70 @source_preprocess_no_compile,
72 # List of source file extensions which don't require preprocessing.
73 my @source_no_preprocess_compile_cpp = (
79 my @source_no_preprocess_compile = (
83 @source_no_preprocess_compile_cpp,
87 qw( f for ftn f90 f95 f03 f08 ),
89 my @source_no_preprocess_no_compile = (
93 my @source_no_preprocess = (
94 @source_no_preprocess_compile,
95 @source_no_preprocess_no_compile,
97 # List of header file extensions which require preprocessing.
98 my @header_preprocess = (
99 # C, C++, Objective-C, Objective-C++
102 qw( hh H hp hxx hpp HPP h++ tcc ),
105 # Hashes for fast extensions lookup to check if a file falls in one of these
107 my %extensions_no_preprocess = map { $_ => 1 } (
108 @source_no_preprocess,
110 my %extensions_preprocess = map { $_ => 1 } (
114 my %extensions_compile_link = map { $_ => 1 } (
116 @source_no_preprocess,
118 my %extensions_compile = map { $_ => 1 } (
119 @source_preprocess_compile,
120 @source_no_preprocess_compile,
122 my %extensions_no_compile = map { $_ => 1 } (
123 @source_preprocess_no_compile,
124 @source_no_preprocess_no_compile,
126 my %extensions_compile_cpp = map { $_ => 1 } (
127 @source_preprocess_compile_cpp,
128 @source_no_preprocess_compile_cpp,
130 my %extension = map { $_ => 1 } (
131 @source_no_preprocess,
136 # Regexp to match file extensions.
137 my $file_extension_regex = qr/
139 \S+ # Filename without extension.
141 ([^\/\\.,;:\s]+)# File extension.
142 (?=\s|\\) # At end of word. Can't use \b because some files have non
143 # word characters at the end and because \b matches double
144 # extensions (like .cpp.o). Works always as all lines are
145 # terminated with "\n".
148 # Expected (hardening) flags. All flags are used as regexps.
153 my @def_cflags_format = (
156 '-Werror=format-security',
158 my @def_cflags_fortify = (
159 # fortify needs at least -O1, but -O2 is recommended anyway
161 my @def_cflags_stack = (
163 '--param=ssp-buffer-size=4',
165 my @def_cflags_pie = (
171 # @def_cxxflags_* is the same as @def_cflags_*.
172 my @def_cppflags = ();
173 my @def_cppflags_fortify = (
174 '-D_FORTIFY_SOURCE=2',
176 my @def_ldflags = ();
177 my @def_ldflags_relro = (
180 my @def_ldflags_bindnow = (
183 my @def_ldflags_pie = (
187 my @def_ldflags_pic = (
192 # References to all flags checked by the parser.
196 \@def_cflags_fortify,
201 \@def_cppflags_fortify,
204 \@def_ldflags_bindnow,
206 # References to all used flags.
207 my @flag_refs_all = (
212 # Renaming rules for the output so the regex parts are not visible. Also
213 # stores string values of flag regexps above, see compile_flag_regexp().
215 '-O(?:2|3)' => '-O2',
216 '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
217 '-Wl,(?:-z,)?now' => '-Wl,-z,now',
221 no_compiler_commands => 1 << 0,
222 # used by POD::Usage => 1 << 1,
223 non_verbose_build => 1 << 2,
224 flags_missing => 1 << 3,
225 hardening_wrapper => 1 << 4,
226 invalid_cmake => 1 << 5,
229 # Statistics of missing flags and non-verbose build commands. Used for
233 preprocess_missing => 0,
235 compile_missing => 0,
237 compile_cpp_missing => 0,
241 commands_nonverbose => 0,
244 # Use colored (ANSI) output?
251 my ($message, $missing_flags_ref, $flag_renames_ref, $line) = @_;
253 # Get string value of qr//-escaped regexps and if requested rename them.
254 my @missing_flags = map {
255 $flag_renames_ref->{$_}
256 } @{$missing_flags_ref};
258 my $flags = join ' ', @missing_flags;
259 printf "%s (%s)%s %s",
260 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
263 sub error_non_verbose_build {
267 error_color('NONVERBOSE BUILD', 'red'),
268 error_color(':', 'yellow'),
271 sub error_invalid_cmake {
275 error_color('INVALID CMAKE', 'red'),
276 error_color(':', 'yellow'),
279 sub error_hardening_wrapper {
281 error_color('HARDENING WRAPPER', 'red'),
282 error_color(':', 'yellow'),
283 'no checks possible, aborting';
286 my ($message, $color) = @_;
289 return Term::ANSIColor::colored($message, $color);
296 my ($line, @flags) = @_;
298 foreach my $flag (@flags) {
299 return 1 if $line =~ /$flag/;
305 my ($line, $missing_flags_ref, @flags) = @_;
307 my @missing_flags = ();
308 foreach my $flag (@flags) {
309 if (not $line =~ /$flag/) {
310 push @missing_flags, $flag;
314 return 1 if scalar @missing_flags == 0;
316 @{$missing_flags_ref} = @missing_flags;
320 # Modifies $missing_flags_ref array.
321 sub pic_pie_conflict {
322 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
324 return 0 if not $pie;
325 return 0 if not any_flags_used($line, @def_ldflags_pic);
327 my %flags = map { $_ => 1 } @flags_pie;
329 # Remove all PIE flags from @missing_flags as they are not required with
332 not exists $flags{$_}
333 } @{$missing_flags_ref};
334 @{$missing_flags_ref} = @result;
336 # We got a conflict when no flags are left, thus only PIE flags were
337 # missing. If other flags were missing abort because the conflict is not
339 return scalar @result == 0;
342 sub is_non_verbose_build {
343 my ($line, $next_line, $skip_ref) = @_;
345 if (not ($line =~ /^checking if you want to see long compiling messages\.\.\. no/
346 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
347 or $line =~ /^\s*(?:C|c)ompiling\s+(.+?)(?:\.\.\.)?$/
348 or $line =~ /^\s*(?:B|b)uilding (?:program|shared library)\s+(.+?)$/
349 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
355 # C++ compiler setting.
356 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
357 # "Compiling" with no file name.
358 if ($line =~ /^\s*(?:C|c)ompiling\s+(.+?)(?:\.\.\.)?$/) {
359 # $file_extension_regex may need spaces around the filename.
360 return 0 if not " $1 " =~ /$file_extension_regex/o;
365 # On the first pass we only check if this line is verbose or not.
366 return 1 if not defined $next_line;
368 # Second pass, we have access to the next line.
371 # CMake and other build systems print the non-verbose messages also when
372 # building verbose. If a compiler and the file name occurs in the next
373 # line, treat it as verbose build.
375 # Get filename, we can't use the complete path as only parts of it are
376 # used in the real compiler command.
377 $file =~ m{/([^/\s]+)$};
380 if ($next_line =~ /\Q$file\E/ and $next_line =~ /$cc_regex/o) {
381 # We still have to skip the current line as it doesn't contain any
391 sub compile_flag_regexp {
392 my ($flag_renames_ref, @flags) = @_;
395 foreach my $flag (@flags) {
396 # Store flag name in replacement string for correct flags in messages
397 # with qr//ed flag regexps.
398 $flag_renames_ref->{qr/\s$flag(?:\s|\\)/}
399 = (exists $flag_renames_ref->{$flag})
400 ? $flag_renames_ref->{$flag}
403 # Compile flag regexp for faster execution.
404 push @result, qr/\s$flag(?:\s|\\)/;
409 sub extension_found {
410 my ($extensions_ref, @extensions) = @_;
413 foreach my $extension (@extensions) {
414 if (exists $extensions_ref->{$extension}) {
425 # Parse command line arguments.
427 my $option_version = 0;
429 my $option_bindnow = 0;
430 my @option_ignore_flag = ();
431 my @option_ignore_line = ();
433 my $option_arch = undef;
434 my $option_buildd = 0;
436 if (not Getopt::Long::GetOptions(
437 'help|h|?' => \$option_help,
438 'version' => \$option_version,
440 'pie' => \$option_pie,
441 'bindnow' => \$option_bindnow,
442 'all' => \$option_all,
444 'ignore-flag=s' => \@option_ignore_flag,
445 'ignore-line=s' => \@option_ignore_line,
447 'color' => \$option_color,
448 'arch=s' => \$option_arch,
449 'buildd' => \$option_buildd,
451 or scalar @ARGV == 0) {
453 Pod::Usage::pod2usage(2);
457 Pod::Usage::pod2usage(1);
459 if ($option_version) {
460 print "blhc $VERSION Copyright (C) 2012 Simon Ruderich
462 This program is free software: you can redistribute it and/or modify
463 it under the terms of the GNU General Public License as published by
464 the Free Software Foundation, either version 3 of the License, or
465 (at your option) any later version.
467 This program is distributed in the hope that it will be useful,
468 but WITHOUT ANY WARRANTY; without even the implied warranty of
469 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
470 GNU General Public License for more details.
472 You should have received a copy of the GNU General Public License
473 along with this program. If not, see <http://www.gnu.org/licenses/>.
478 # Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
479 # installed on Debian's buildds.
480 if (not $option_buildd) {
481 require Term::ANSIColor;
489 # Strip flags which should be ignored.
490 if (scalar @option_ignore_flag > 0) {
491 my %ignores = map { $_ => 1 } @option_ignore_flag;
492 foreach my $flags (@flag_refs) {
494 # Flag found as string.
495 not exists $ignores{$_}
496 # Flag found as string representation of regexp.
497 and (not defined $flag_renames{$_}
498 or not exists $ignores{$flag_renames{$_}})
503 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
505 foreach my $flags (@flag_refs_all) {
506 @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
509 # Precompile ignore line regexps, also anchor at beginning and end of line.
510 foreach my $ignore (@option_ignore_line) {
511 $ignore = qr/^$ignore$/;
518 foreach my $file (@ARGV) {
519 print "checking '$file'...\n" if scalar @ARGV > 1;
521 open my $fh, '<', $file or die "$!: $file";
523 # Architecture of this file.
524 my $arch = $option_arch;
526 # Hardening options. Not all architectures support all hardening options.
527 my $harden_format = 1;
528 my $harden_fortify = 1;
529 my $harden_stack = 1;
530 my $harden_relro = 1;
531 my $harden_bindnow = $option_bindnow; # defaults to 0
532 my $harden_pie = $option_pie; # defaults to 0
534 while (my $line = <$fh>) {
535 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
536 # check for hardening flags in buildd mode if an older dpkg-dev is
537 # used. Default flags (-g -O2) are still checked.
539 # Packages which were built before 1.16.1 but used their own hardening
540 # flags are not checked.
541 if ($option_buildd and $line =~ /^Toolchain package versions: /) {
542 require Dpkg::Version;
543 if ($line !~ /\bdpkg-dev_(\S+)/
544 or Dpkg::Version::version_compare($1, '1.16.1') < 0) {
554 # The following two versions of CMake in Debian obeyed CPPFLAGS, but
555 # this was later dropped because upstream rejected the patch. Thus
556 # build logs with these versions will have fortify hardening flags
557 # enabled, even though they may be not correctly set and are missing
558 # when build with later CMake versions. Thanks to Aron Xu for letting
560 if ($line =~ /^Package versions: /
561 and $line =~ /\bcmake_(\S+)/
562 and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
563 if (not $option_buildd) {
564 error_invalid_cmake($1);
566 print "W-invalid-cmake-used $1\n";
568 $exit |= $exit_code{invalid_cmake};
571 # If hardening wrapper is used (wraps calls to gcc and adds hardening
572 # flags automatically) we can't perform any checks, abort.
573 if ($line =~ /^Build-Depends: .*\bhardening-wrapper\b/) {
574 if (not $option_buildd) {
575 error_hardening_wrapper();
577 print "I-hardening-wrapper-used\n";
579 $exit |= $exit_code{hardening_wrapper};
583 # We skip over unimportant lines at the beginning of the log to
584 # prevent false positives.
585 last if $line =~ /^dpkg-buildpackage:/;
588 # Input lines, contain only the lines with compiler commands.
591 my $continuation = 0;
592 my $complete_line = undef;
593 while (my $line = <$fh>) {
594 # And stop at the end of the build log. Package details (reported by
595 # the buildd logs) are not important for us. This also prevents false
597 last if $line =~ /^Build finished at \d{8}-\d{4}$/;
599 # Detect architecture automatically unless overridden.
601 and $line =~ /^dpkg-buildpackage: host architecture (.+)$/) {
605 # Ignore compiler warnings for now.
606 next if $line =~ /$warning_regex/o;
608 if (not $option_buildd and $line =~ /\033/) { # esc
609 # Remove all ANSI color sequences which are sometimes used in
610 # non-verbose builds.
611 $line = Term::ANSIColor::colorstrip($line);
612 # Also strip '\0xf' (delete previous character), used by Elinks'
615 # And "ESC(B" which seems to be used on armhf and hurd (not sure
617 $line =~ s/\033\(B//g;
620 # Check if this line indicates a non verbose build.
621 my $non_verbose = is_non_verbose_build($line);
623 # One line may contain multiple commands (";"). Treat each one as
624 # single line. parse_line() is slow, only use it when necessary.
625 my @line = (not $line =~ /;/)
628 # Ensure newline at the line end - necessary for
629 # correct parsing later.
632 } Text::ParseWords::parse_line(';', 1, $line);
633 foreach $line (@line) {
637 # Join lines, but leave the "\" in place so it's clear where
638 # the original line break was.
639 chomp $complete_line;
640 $complete_line .= ' ' . $line;
642 # Line continuation, line ends with "\".
643 if ($line =~ /\\\s*$/) {
645 # Start line continuation.
646 if (not defined $complete_line) {
647 $complete_line = $line;
652 # Use the complete line if a line continuation occurred.
653 if (defined $complete_line) {
654 $line = $complete_line;
655 $complete_line = undef;
658 # Ignore lines with no compiler commands.
659 next if not $non_verbose
660 and not $line =~ /\b$cc_regex(?:\s|\\)/o;
661 # Ignore lines with no filenames with extensions. May miss some
662 # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
663 # a problem as the log will most likely contain other non-verbose
664 # commands which are detected.
665 next if not $non_verbose
666 and not $line =~ /$file_extension_regex/o;
668 # Ignore false positives.
670 # `./configure` output.
671 next if not $non_verbose
672 and $line =~ /^(?:checking|(?:C|c)onfigure:) /;
673 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
674 (?:C|c)ompiler[\s.]*:?\s+
676 next if $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex_full\s*$/o;
678 # Check if additional hardening options were used. Used to ensure
679 # they are used for the complete build.
680 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie, @def_ldflags_pie);
681 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
689 if (scalar @input == 0) {
690 if (not $option_buildd) {
691 print "No compiler commands!\n";
693 print "W-no-compiler-commands\n";
695 $exit |= $exit_code{no_compiler_commands};
699 if ($option_buildd) {
700 $statistics{commands} += scalar @input;
703 # Option or auto detected.
705 # The following was partially copied from dpkg-dev 1.16.1.2
706 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, add_hardening_flags()),
707 # copyright Raphaël Hertzog <hertzog@debian.org>, Kees Cook
708 # <kees@debian.org>, Canonical, Ltd. licensed under GPL version 2 or
709 # later. Keep it in sync.
712 my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
714 # Disable unsupported hardening options.
715 if ($cpu =~ /^(?:ia64|alpha|mips|mipsel|hppa)$/ or $arch eq 'arm') {
718 if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
725 my @cflags = @def_cflags;
726 my @cxxflags = @def_cxxflags;
727 my @cppflags = @def_cppflags;
728 my @ldflags = @def_ldflags;
729 # Check the specified hardening options, same order as dpkg-buildflags.
731 @cflags = (@cflags, @def_cflags_pie);
732 @cxxflags = (@cxxflags, @def_cflags_pie);
733 @ldflags = (@ldflags, @def_ldflags_pie);
736 @cflags = (@cflags, @def_cflags_stack);
737 @cxxflags = (@cxxflags, @def_cflags_stack);
739 if ($harden_fortify) {
740 @cflags = (@cflags, @def_cflags_fortify);
741 @cxxflags = (@cxxflags, @def_cflags_fortify);
742 @cppflags = (@cppflags, @def_cppflags_fortify);
744 if ($harden_format) {
745 @cflags = (@cflags, @def_cflags_format);
746 @cxxflags = (@cxxflags, @def_cflags_format);
749 @ldflags = (@ldflags, @def_ldflags_relro);
751 if ($harden_bindnow) {
752 @ldflags = (@ldflags, @def_ldflags_bindnow);
756 for (my $i = 0; $i < scalar @input; $i++) {
757 my $line = $input[$i];
759 # Ignore line if requested.
760 foreach my $ignore (@option_ignore_line) {
761 next LINE if $line =~ /$ignore/;
765 if (is_non_verbose_build($line, $input[$i + 1], \$skip)) {
766 if (not $option_buildd) {
767 error_non_verbose_build($line);
769 $statistics{commands_nonverbose}++;
771 $exit |= $exit_code{non_verbose_build};
774 # Even if it's a verbose build, we might have to skip this line.
777 # Remove everything until and including the compiler command. Makes
778 # checks easier and faster.
779 $line =~ s/^.*?$cc_regex//o;
780 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
781 # the brace and similar characters.
782 $line =~ s/['")]+$//;
784 # Skip unnecessary tests when only preprocessing.
785 my $flag_preprocess = 0;
792 # Preprocess, compile, assemble.
793 if ($line =~ /\s(-E|-S|-c)\b/) {
795 $flag_preprocess = 1 if $1 eq '-E';
796 $compile = 1 if $1 eq '-S' or $1 eq '-c';
797 # Dependency generation for Makefiles. The other flags (-MF -MG -MP
798 # -MT -MQ) are always used with -M/-MM.
799 } elsif ($line =~ /\s(?:-M|-MM)\b/) {
801 # Otherwise assume we are linking.
806 # -MD/-MMD also cause dependency generation, but they don't imply -E!
807 if ($line =~ /\s(?:-MD|-MMD)\b/) {
809 $flag_preprocess = 0;
812 # Dependency generation for Makefiles, no preprocessing or other flags
816 # Get all file extensions on this line.
817 my @extensions = $line =~ /$file_extension_regex/go;
818 # Ignore all unknown extensions to speedup the search below.
819 @extensions = grep { exists $extension{$_} } @extensions;
821 # These file types don't require preprocessing.
822 if (extension_found(\%extensions_no_preprocess, @extensions)) {
825 # These file types require preprocessing.
826 if (extension_found(\%extensions_preprocess, @extensions)) {
830 # If there are source files then it's compiling/linking in one step
831 # and we must check both. We only check for source files here, because
832 # header files cause too many false positives.
833 if (not $flag_preprocess
834 and extension_found(\%extensions_compile_link, @extensions)) {
835 # Assembly files don't need CFLAGS.
836 if (not extension_found(\%extensions_compile, @extensions)
837 and extension_found(\%extensions_no_compile, @extensions)) {
845 # Assume CXXFLAGS are required when a C++ file is specified in the
849 and extension_found(\%extensions_compile_cpp, @extensions)) {
854 if ($option_buildd) {
855 $statistics{preprocess}++ if $preprocess;
856 $statistics{compile}++ if $compile;
857 $statistics{compile_cpp}++ if $compile_cpp;
858 $statistics{link}++ if $link;
861 # Check hardening flags.
863 if ($compile and not all_flags_used($line, \@missing, @cflags)
864 # Libraries linked with -fPIC don't have to (and can't) be
865 # linked with -fPIE as well. It's no error if only PIE flags
867 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
868 # Assume dpkg-buildflags returns the correct flags.
869 and not $line =~ /`dpkg-buildflags --get CFLAGS`/) {
870 if (not $option_buildd) {
871 error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
873 $statistics{compile_missing}++;
875 $exit |= $exit_code{flags_missing};
876 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
877 # Libraries linked with -fPIC don't have to (and can't) be
878 # linked with -fPIE as well. It's no error if only PIE flags
880 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
881 # Assume dpkg-buildflags returns the correct flags.
882 and not $line =~ /`dpkg-buildflags --get CXXFLAGS`/) {
883 if (not $option_buildd) {
884 error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
886 $statistics{compile_cpp_missing}++;
888 $exit |= $exit_code{flags_missing};
890 if ($preprocess and not all_flags_used($line, \@missing, @cppflags)
891 # Assume dpkg-buildflags returns the correct flags.
892 and not $line =~ /`dpkg-buildflags --get CPPFLAGS`/) {
893 if (not $option_buildd) {
894 error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
896 $statistics{preprocess_missing}++;
898 $exit |= $exit_code{flags_missing};
900 if ($link and not all_flags_used($line, \@missing, @ldflags)
901 # Same here, -fPIC conflicts with -fPIE.
902 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
903 # Assume dpkg-buildflags returns the correct flags.
904 and not $line =~ /`dpkg-buildflags --get LDFLAGS`/) {
905 if (not $option_buildd) {
906 error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
908 $statistics{link_missing}++;
910 $exit |= $exit_code{flags_missing};
915 # Print statistics for buildd mode, only output in this mode.
916 if ($option_buildd) {
919 if ($statistics{preprocess_missing}) {
920 push @warning, sprintf "CPPFLAGS %d (of %d)",
921 $statistics{preprocess_missing},
922 $statistics{preprocess};
924 if ($statistics{compile_missing}) {
925 push @warning, sprintf "CFLAGS %d (of %d)",
926 $statistics{compile_missing},
927 $statistics{compile};
929 if ($statistics{compile_cpp_missing}) {
930 push @warning, sprintf "CXXFLAGS %d (of %d)",
931 $statistics{compile_cpp_missing},
932 $statistics{compile_cpp};
934 if ($statistics{link_missing}) {
935 push @warning, sprintf "LDFLAGS %d (of %d)",
936 $statistics{link_missing},
939 if (scalar @warning) {
940 local $" = ', '; # array join string
941 print "W-dpkg-buildflags-missing @warning missing\n";
944 if ($statistics{commands_nonverbose}) {
945 printf "W-compiler-flags-hidden %d (of %d) hidden\n",
946 $statistics{commands_nonverbose},
947 $statistics{commands},
959 blhc - build log hardening check, checks build logs for missing hardening flags
963 B<blhc> [I<options>] I<E<lt>dpkg-buildpackage build log fileE<gt>..>
967 blhc is a small tool which checks build logs for missing hardening flags. It's
968 licensed under the GPL 3 or later.
970 It's designed to check build logs generated by Debian's dpkg-buildpackage (or
971 tools using dpkg-buildpackage like pbuilder or the official buildd build logs)
972 to help maintainers detect missing hardening flags in their packages.
980 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
983 =item B<--arch> I<architecture>
985 Set the specific architecture (e.g. amd64, armel, etc.), automatically
986 disables hardening flags not available on this architecture. Is detected
987 automatically if dpkg-buildpackage is used.
991 Force check for all +bindnow hardening flags. By default it's auto detected.
995 Special mode for buildds when automatically parsing log files. The following
996 changes are in effect:
1002 Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
1007 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
1012 Don't require Term::ANSIColor.
1018 Use colored (ANSI) output for warning messages.
1020 =item B<--ignore-flag> I<flag>
1022 Don't print an error when the specific flag is missing in a compiler line.
1023 I<flag> is a string.
1025 Used to prevent false positives. This option can be specified multiple times.
1027 =item B<--ignore-line> I<regex>
1029 Ignore lines matching the given Perl regex. I<regex> is automatically anchored
1030 at the beginning and end of the line to prevent false negatives.
1032 B<NOTE>: Not the input lines are checked, but the lines which are displayed in
1033 warnings (which have line continuation resolved).
1035 Used to prevent false positives. This option can be specified multiple times.
1039 Force check for all +pie hardening flags. By default it's auto detected.
1041 =item B<-h -? --help>
1043 Print available options.
1047 Print version number and license.
1051 Auto detection for B<--pie> and B<--bindnow> only works if at least one
1052 command uses the required hardening flag (e.g. -fPIE). Then it's required for
1053 all other commands as well.
1057 Normal usage, parse a single log file.
1059 blhc path/to/log/file
1061 Parse multiple log files. The exit code is ORed over all files.
1063 blhc path/to/directory/with/log/files/*
1065 Don't treat missing C<-g> as error:
1067 blhc --ignore-flag -g path/to/log/file
1069 Ignore lines consisting exactly of C<./script gcc file> which would cause a
1072 blhc --ignore-line '\./script gcc file' path/to/log/file
1074 Ignore lines matching C<./script gcc file> somewhere in the line.
1076 blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
1078 Use blhc with pbuilder.
1080 pbuilder path/to/package.dsc | tee path/log/file
1081 blhc path/to/file || echo flags missing
1085 The following tags are used in I<--buildd> mode. In braces the additional data
1092 B<I-hardening-wrapper-used>
1094 The package uses hardening-wrapper which intercepts calls to gcc and adds
1095 hardening flags. The build log doesn't contain any hardening flags and thus
1096 can't be checked by blhc.
1100 B<W-compiler-flags-hidden> (summary of hidden lines)
1102 Build log contains lines which hide the real compiler flags. For example:
1109 Most of the time either C<export V=1> or C<export verbose=1> in
1110 F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
1111 in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
1112 patched to remove the C<@>s hiding the real compiler commands.
1116 B<W-dpkg-buildflags-missing> (summary of missing flags)
1118 CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
1122 B<W-invalid-cmake-used> (version)
1126 B<W-no-compiler-commands>
1128 No compiler commands were detected. Either the log contains none or they were
1129 not correctly detected by blhc (please report the bug in this case).
1135 The exit status is a "bit mask", each listed status is ORed when the error
1136 condition occurs to get the result.
1146 No compiler commands were found.
1150 Invalid arguments/options given to blhc.
1158 Missing hardening flags.
1162 Hardening wrapper detected, no tests performed.
1168 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
1170 Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
1171 E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
1173 =head1 COPYRIGHT AND LICENSE
1175 Copyright (C) 2012 by Simon Ruderich
1177 This program is free software: you can redistribute it and/or modify
1178 it under the terms of the GNU General Public License as published by
1179 the Free Software Foundation, either version 3 of the License, or
1180 (at your option) any later version.
1182 This program is distributed in the hope that it will be useful,
1183 but WITHOUT ANY WARRANTY; without even the implied warranty of
1184 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1185 GNU General Public License for more details.
1187 You should have received a copy of the GNU General Public License
1188 along with this program. If not, see <http://www.gnu.org/licenses/>.
1192 L<hardening-check(1)>, L<dpkg-buildflags(1)>