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 Term::ANSIColor ();
26 use Text::ParseWords ();
28 our $VERSION = '0.01';
33 # Regex to catch compiler commands.
35 (?<!\.)(?:cc|gcc|g\+\+|c\+\+)
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,
132 @source_no_preprocess_compile,
133 @source_no_preprocess_compile_cpp,
134 @source_no_preprocess_no_compile,
137 @source_preprocess_compile,
138 @source_preprocess_compile_cpp,
139 @source_preprocess_no_compile,
142 # Regexp to match file extensions.
143 my $file_extension_regex = qr/
145 \S+ # Filename without extension.
147 ([^\\.,;:\s]+) # File extension.
148 (?=\s|\\) # At end of word. Can't use \b because some files have non
149 # word characters at the end and because \b matches double
150 # extensions (like .cpp.o). Works always as all lines are
151 # terminated with "\n".
154 # Expected (hardening) flags. All flags are used as regexps.
159 my @def_cflags_format = (
162 '-Werror=format-security',
164 my @def_cflags_fortify = (
165 # fortify needs at least -O1, but -O2 is recommended anyway
167 my @def_cflags_stack = (
169 '--param=ssp-buffer-size=4',
171 my @def_cflags_pie = (
177 # @def_cxxflags_* is the same as @def_cflags_*.
178 my @def_cppflags = ();
179 my @def_cppflags_fortify = (
180 '-D_FORTIFY_SOURCE=2',
182 my @def_ldflags = ();
183 my @def_ldflags_relro = (
186 my @def_ldflags_bindnow = (
189 my @def_ldflags_pie = (
193 my @def_ldflags_pic = (
198 # Renaming rules for the output so the regex parts are not visible. Also
199 # stores string values of flag regexps above, see compile_flag_regexp().
201 '-O(?:2|3)' => '-O2',
202 '-Wl,(-z,)?relro' => '-Wl,-z,relro',
203 '-Wl,(-z,)?now' => '-Wl,-z,now',
207 no_compiler_commands => 1 << 0,
208 # used by POD::Usage => 1 << 1,
209 non_verbose_build => 1 << 2,
210 flags_missing => 1 << 3,
211 hardening_wrapper => 1 << 4,
214 # Statistics of missing flags and non-verbose build commands. Used for
218 preprocess_missing => 0,
220 compile_missing => 0,
222 compile_cpp_missing => 0,
226 commands_nonverbose => 0,
229 # Use colored (ANSI) output?
236 my ($message, $missing_flags_ref, $flag_renames_ref, $line) = @_;
238 # Get string value of qr//-escaped regexps and if requested rename them.
239 my @missing_flags = map {
240 $flag_renames_ref->{$_}
241 } @{$missing_flags_ref};
243 my $flags = join ' ', @missing_flags;
244 printf "%s (%s)%s %s",
245 error_color($message, 'red'), $flags, error_color(':', 'yellow'),
248 sub error_non_verbose_build {
252 error_color('NONVERBOSE BUILD', 'red'),
253 error_color(':', 'yellow'),
256 sub error_hardening_wrapper {
258 error_color('HARDENING WRAPPER', 'red'),
259 error_color(':', 'yellow'),
260 'no checks possible, aborting';
263 my ($message, $color) = @_;
266 return Term::ANSIColor::colored($message, $color);
273 my ($line, @flags) = @_;
275 foreach my $flag (@flags) {
276 return 1 if $line =~ /$flag/;
282 my ($line, $missing_flags_ref, @flags) = @_;
284 my @missing_flags = ();
285 foreach my $flag (@flags) {
286 if (not $line =~ /$flag/) {
287 push @missing_flags, $flag;
291 return 1 if scalar @missing_flags == 0;
293 @{$missing_flags_ref} = @missing_flags;
297 # Modifies $missing_flags_ref array.
298 sub pic_pie_conflict {
299 my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
301 return 0 if not $pie;
302 return 0 if not any_flags_used($line, @def_ldflags_pic);
304 my %flags = map { $_ => 1 } @flags_pie;
306 # Remove all PIE flags from @missing_flags as they are not required with
309 not exists $flags{$_}
310 } @{$missing_flags_ref};
311 @{$missing_flags_ref} = @result;
313 # We got a conflict when no flags are left, thus only PIE flags were
314 # missing. If other flags were missing abort because the conflict is not
316 return scalar @result == 0;
319 sub is_non_verbose_build {
320 my ($line, $next_line, $skip_ref) = @_;
322 if (not ($line =~ /^checking if you want to see long compiling messages\.\.\. no/
323 or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
324 or $line =~ /^\s*(?:C|c)ompiling\s+(.+?)(?:\.\.\.)?$/
325 or $line =~ /^\s*(?:B|b)uilding (?:program|shared library)\s+(.+?)$/
326 or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
331 return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
335 # On the first pass we only check if this line is verbose or not.
336 return 1 if not defined $next_line;
338 # Second pass, we have access to the next line.
341 # CMake and other build systems print the non-verbose messages also when
342 # building verbose. If a compiler and the file name occurs in the next
343 # line, treat it as verbose build.
345 # Get filename, we can't use the complete path as only parts of it are
346 # used in the real compiler command.
347 $file =~ m{/([^/\s]+)$};
350 if ($next_line =~ /\Q$file\E/ and $next_line =~ /$cc_regex/o) {
351 # We still have to skip the current line as it doesn't contain any
361 sub compile_flag_regexp {
362 my ($flag_renames_ref, @flags) = @_;
365 foreach my $flag (@flags) {
366 # Store flag name in replacement string for correct flags in messages
367 # with qr//ed flag regexps.
368 $flag_renames_ref->{qr/\s$flag(?:\s|\\)/}
369 = (exists $flag_renames_ref->{$flag})
370 ? $flag_renames_ref->{$flag}
373 # Compile flag regexp for faster execution.
374 push @result, qr/\s$flag(?:\s|\\)/;
379 sub extension_found {
380 my ($extensions_ref, @extensions) = @_;
383 foreach my $extension (@extensions) {
384 if (exists $extensions_ref->{$extension}) {
395 # Parse command line arguments.
397 my $option_version = 0;
399 my $option_bindnow = 0;
401 my $option_arch = undef;
402 my $option_buildd = 0;
404 if (not Getopt::Long::GetOptions(
405 'help|h|?' => \$option_help,
406 'version' => \$option_version,
408 'pie' => \$option_pie,
409 'bindnow' => \$option_bindnow,
410 'all' => \$option_all,
412 'color' => \$option_color,
413 'arch=s' => \$option_arch,
414 'buildd' => \$option_buildd,
417 Pod::Usage::pod2usage(2);
421 Pod::Usage::pod2usage(1);
423 if ($option_version) {
424 print "blhc $VERSION Copyright (C) 2012 Simon Ruderich
426 This program is free software: you can redistribute it and/or modify
427 it under the terms of the GNU General Public License as published by
428 the Free Software Foundation, either version 3 of the License, or
429 (at your option) any later version.
431 This program is distributed in the hope that it will be useful,
432 but WITHOUT ANY WARRANTY; without even the implied warranty of
433 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
434 GNU General Public License for more details.
436 You should have received a copy of the GNU General Public License
437 along with this program. If not, see <http://www.gnu.org/licenses/>.
447 # Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
449 @def_cflags = compile_flag_regexp(\%flag_renames, @def_cflags);
450 @def_cflags_format = compile_flag_regexp(\%flag_renames, @def_cflags_format);
451 @def_cflags_fortify = compile_flag_regexp(\%flag_renames, @def_cflags_fortify);
452 @def_cflags_stack = compile_flag_regexp(\%flag_renames, @def_cflags_stack);
453 @def_cflags_pie = compile_flag_regexp(\%flag_renames, @def_cflags_pie);
454 @def_cxxflags = compile_flag_regexp(\%flag_renames, @def_cxxflags);
455 @def_cppflags = compile_flag_regexp(\%flag_renames, @def_cppflags);
456 @def_cppflags_fortify = compile_flag_regexp(\%flag_renames, @def_cppflags_fortify);
457 @def_ldflags = compile_flag_regexp(\%flag_renames, @def_ldflags);
458 @def_ldflags_relro = compile_flag_regexp(\%flag_renames, @def_ldflags_relro);
459 @def_ldflags_bindnow = compile_flag_regexp(\%flag_renames, @def_ldflags_bindnow);
460 @def_ldflags_pie = compile_flag_regexp(\%flag_renames, @def_ldflags_pie);
461 @def_ldflags_pic = compile_flag_regexp(\%flag_renames, @def_ldflags_pic);
466 FILE: foreach my $file (@ARGV) {
467 open my $fh, '<', $file or die "$!: $file";
469 # Hardening options. Not all architectures support all hardening options.
470 my $harden_format = 1;
471 my $harden_fortify = 1;
472 my $harden_stack = 1;
473 my $harden_relro = 1;
474 my $harden_bindnow = $option_bindnow; # defaults to 0
475 my $harden_pie = $option_pie; # defaults to 0
477 while (my $line = <$fh>) {
478 # dpkg-buildflags only provides hardening flags since 1.16.1, don't
479 # check for hardening flags in buildd mode if an older dpkg-dev is
480 # used. Default flags (-g -O2) are still checked.
482 # Packages which were built before 1.16.1 but used their own hardening
483 # flags are not checked.
484 if ($option_buildd and $line =~ /^Toolchain package versions: /) {
485 require Dpkg::Version;
486 if ($line !~ /dpkg-dev_(\S+)/
487 or Dpkg::Version::version_compare($1, '1.16.1') < 0) {
497 # If hardening wrapper is used (wraps calls to gcc and adds hardening
498 # flags automatically) we can't perform any checks, abort.
499 if ($line =~ /^Build-Depends: .*\bhardening-wrapper\b/) {
500 if (not $option_buildd) {
501 error_hardening_wrapper();
503 print "I-hardening-wrapper-used\n";
505 $exit |= $exit_code{hardening_wrapper};
509 # We skip over unimportant lines at the beginning of the log to
510 # prevent false positives.
511 last if $line =~ /^dpkg-buildpackage:/;
514 # Input lines, contain only the lines with compiler commands.
517 my $continuation = 0;
518 my $complete_line = undef;
519 while (my $line = <$fh>) {
520 # And stop at the end of the build log. Package details (reported by
521 # the buildd logs) are not important for us. This also prevents false
523 last if $line =~ /^Build finished at \d{8}-\d{4}$/;
525 # Detect architecture automatically unless overridden.
527 and $line =~ /^dpkg-buildpackage: host architecture (.+)$/) {
531 # Ignore compiler warnings for now.
532 next if $line =~ /$warning_regex/o;
534 if ($line =~ /\033/) { # esc
535 # Remove all ANSI color sequences which are sometimes used in
536 # non-verbose builds.
537 $line = Term::ANSIColor::colorstrip($line);
538 # Also strip '\0xf' (delete previous character), used by Elinks'
541 # And "ESC(B" which seems to be used on armhf and hurd (not sure
543 $line =~ s/\033\(B//g;
546 # Check if this line indicates a non verbose build.
547 my $non_verbose = is_non_verbose_build($line);
549 # One line may contain multiple commands (";"). Treat each one as
550 # single line. parse_line() is slow, only use it when necessary.
551 my @line = (not $line =~ /;/)
554 # Ensure newline at the line end - necessary for
555 # correct parsing later.
558 } Text::ParseWords::parse_line(';', 1, $line);
559 foreach $line (@line) {
563 # Join lines, but leave the "\" in place so it's clear where
564 # the original line break was.
565 chomp $complete_line;
566 $complete_line .= ' ' . $line;
568 # Line continuation, line ends with "\".
569 if ($line =~ /\\\s*$/) {
571 # Start line continuation.
572 if (not defined $complete_line) {
573 $complete_line = $line;
578 if (not $continuation) {
579 # Use the complete line if a line continuation occurred.
580 if (defined $complete_line) {
581 $line = $complete_line;
582 $complete_line = undef;
585 # Ignore lines with no compiler commands.
586 next if not $non_verbose
587 and not $line =~ /\b$cc_regex(?:\s|\\)/o;
588 # Ignore lines with no filenames with extensions. May miss
589 # some non-verbose builds (e.g. "gcc -o test" [sic!]), but
590 # shouldn't be a problem as the log will most likely contain
591 # other non-verbose commands which are detected.
592 next if not $non_verbose
593 and not $line =~ /$file_extension_regex/o;
595 # Ignore false positives.
597 # `./configure` output.
598 next if not $non_verbose
599 and $line =~ /^(?:checking|(?:C|c)onfigure:) /;
600 next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
601 (?:C|c)ompiler[\s.]*:?\s+
603 next if $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex_full\s*$/o;
605 # Check if additional hardening options were used. Used to
606 # ensure they are used for the complete build.
607 $harden_pie = 1 if any_flags_used($line, @def_cflags_pie, @def_ldflags_pie);
608 $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
617 if (scalar @input == 0) {
618 if (not $option_buildd) {
619 print "No compiler commands!\n";
621 print "W-no-compiler-commands\n";
623 $exit |= $exit_code{no_compiler_commands};
627 if ($option_buildd) {
628 $statistics{commands} += scalar @input;
631 # Option or auto detected.
633 # The following was partially copied from dpkg-dev 1.16.1.2
634 # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, add_hardening_flags()),
635 # copyright Raphaël Hertzog <hertzog@debian.org>, Kees Cook
636 # <kees@debian.org>, Canonical, Ltd. licensed under GPL version 2 or
637 # later. Keep it in sync.
640 my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($option_arch);
642 # Disable unsupported hardening options.
643 if ($cpu =~ /^(ia64|alpha|mips|mipsel|hppa)$/ or $option_arch eq 'arm') {
646 if ($cpu =~ /^(ia64|hppa|avr32)$/) {
653 my @cflags = @def_cflags;
654 my @cxxflags = @def_cxxflags;
655 my @cppflags = @def_cppflags;
656 my @ldflags = @def_ldflags;
657 # Check the specified hardening options, same order as dpkg-buildflags.
659 @cflags = (@cflags, @def_cflags_pie);
660 @cxxflags = (@cxxflags, @def_cflags_pie);
661 @ldflags = (@ldflags, @def_ldflags_pie);
664 @cflags = (@cflags, @def_cflags_stack);
665 @cxxflags = (@cxxflags, @def_cflags_stack);
667 if ($harden_fortify) {
668 @cflags = (@cflags, @def_cflags_fortify);
669 @cxxflags = (@cxxflags, @def_cflags_fortify);
670 @cppflags = (@cppflags, @def_cppflags_fortify);
672 if ($harden_format) {
673 @cflags = (@cflags, @def_cflags_format);
674 @cxxflags = (@cxxflags, @def_cflags_format);
677 @ldflags = (@ldflags, @def_ldflags_relro);
679 if ($harden_bindnow) {
680 @ldflags = (@ldflags, @def_ldflags_bindnow);
683 for (my $i = 0; $i < scalar @input; $i++) {
684 my $line = $input[$i];
687 if (is_non_verbose_build($line, $input[$i + 1], \$skip)) {
688 if (not $option_buildd) {
689 error_non_verbose_build($line);
691 $statistics{commands_nonverbose}++;
693 $exit |= $exit_code{non_verbose_build};
696 # Even if it's a verbose build, we might have to skip this line.
699 # Remove everything until and including the compiler command. Makes
700 # checks easier and faster.
701 $line =~ s/^.*?$cc_regex//o;
702 # "([...] test.c)" is not detected as 'test.c' - fix this by removing
703 # the brace and similar characters.
704 $line =~ s/['")]+$//;
706 # Skip unnecessary tests when only preprocessing.
707 my $flag_preprocess = 0;
713 # Preprocess, compile, assemble.
714 if ($line =~ /\s(-E|-S|-c)\b/) {
716 $flag_preprocess = 1 if $1 eq '-E';
717 $compile = 1 if $1 eq '-S' or $1 eq '-c';
718 # Otherwise assume we are linking.
723 # Get all file extensions on this line.
724 my @extensions = $line =~ /$file_extension_regex/go;
725 # Ignore all unknown extensions to speedup the search below.
726 @extensions = grep { exists $extension{$_} } @extensions;
728 # These file types don't require preprocessing.
729 if (extension_found(\%extensions_no_preprocess, @extensions)) {
732 # These file types require preprocessing.
733 if (extension_found(\%extensions_preprocess, @extensions)) {
737 # If there are source files then it's compiling/linking in one step
738 # and we must check both. We only check for source files here, because
739 # header files cause too many false positives.
740 if (not $flag_preprocess
741 and extension_found(\%extensions_compile_link, @extensions)) {
742 # Assembly files don't need CFLAGS.
743 if (not extension_found(\%extensions_compile, @extensions)
744 and extension_found(\%extensions_no_compile, @extensions)) {
752 # Assume CXXFLAGS are required when a C++ file is specified in the
756 and extension_found(\%extensions_compile_cpp, @extensions)) {
761 if ($option_buildd) {
762 $statistics{preprocess}++ if $preprocess;
763 $statistics{compile}++ if $compile;
764 $statistics{compile_cpp}++ if $compile_cpp;
765 $statistics{link}++ if $link;
768 # Check hardening flags.
770 if ($compile and not all_flags_used($line, \@missing, @cflags)
771 # Libraries linked with -fPIC don't have to (and can't) be
772 # linked with -fPIE as well. It's no error if only PIE flags
774 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
775 # Assume dpkg-buildflags returns the correct flags.
776 and not $line =~ /`dpkg-buildflags --get CFLAGS`/) {
777 if (not $option_buildd) {
778 error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
780 $statistics{compile_missing}++;
782 $exit |= $exit_code{flags_missing};
783 } elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
784 # Libraries linked with -fPIC don't have to (and can't) be
785 # linked with -fPIE as well. It's no error if only PIE flags
787 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
788 # Assume dpkg-buildflags returns the correct flags.
789 and not $line =~ /`dpkg-buildflags --get CXXFLAGS`/) {
790 if (not $option_buildd) {
791 error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
793 $statistics{compile_cpp_missing}++;
795 $exit |= $exit_code{flags_missing};
797 if ($preprocess and not all_flags_used($line, \@missing, @cppflags)
798 # Assume dpkg-buildflags returns the correct flags.
799 and not $line =~ /`dpkg-buildflags --get CPPFLAGS`/) {
800 if (not $option_buildd) {
801 error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
803 $statistics{preprocess_missing}++;
805 $exit |= $exit_code{flags_missing};
807 if ($link and not all_flags_used($line, \@missing, @ldflags)
808 # Same here, -fPIC conflicts with -fPIE.
809 and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
810 # Assume dpkg-buildflags returns the correct flags.
811 and not $line =~ /`dpkg-buildflags --get LDFLAGS`/) {
812 if (not $option_buildd) {
813 error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
815 $statistics{link_missing}++;
817 $exit |= $exit_code{flags_missing};
822 # Print statistics for buildd mode, only output in this mode.
823 if ($option_buildd) {
826 if ($statistics{preprocess_missing}) {
827 push @warning, sprintf "CPPFLAGS %d (of %d)",
828 $statistics{preprocess_missing},
829 $statistics{preprocess};
831 if ($statistics{compile_missing}) {
832 push @warning, sprintf "CFLAGS %d (of %d)",
833 $statistics{compile_missing},
834 $statistics{compile};
836 if ($statistics{compile_cpp_missing}) {
837 push @warning, sprintf "CXXFLAGS %d (of %d)",
838 $statistics{compile_cpp_missing},
839 $statistics{compile_cpp};
841 if ($statistics{link_missing}) {
842 push @warning, sprintf "LDFLAGS %d (of %d)",
843 $statistics{link_missing},
846 if (scalar @warning) {
847 local $" = ', '; # array join string
848 print "W-dpkg-buildflags-missing @warning missing\n";
851 if ($statistics{commands_nonverbose}) {
852 printf "W-compiler-flags-hidden %d (of %d) hidden\n",
853 $statistics{commands_nonverbose},
854 $statistics{commands},
866 blhc - build log hardening check, checks build logs for missing hardening flags
870 B<blhc> [I<options>] I<E<lt>dpkg-buildpackage build log fileE<gt>..>
874 blhc is a small tool which checks build logs for missing hardening flags and
875 other important warnings. It's licensed under the GPL 3 or later.
883 Force check for all +all (+pie, +bindnow) hardening flags. By default it's
886 =item B<--arch> I<architecture>
888 Set the specific architecture (e.g. amd64, armel, etc.), automatically
889 disables hardening flags not available on this architecture. Is detected
890 automatically if dpkg-buildpackage is used.
894 Force check for all +bindnow hardening flags. By default it's auto detected.
898 Special mode for buildds when automatically parsing log files. The following
899 changes are in effect:
905 Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
912 Use colored (ANSI) output for warning messages.
916 Force check for all +pie hardening flags. By default it's auto detected.
918 =item B<-h -? --help>
920 Print available options.
924 Print version number and license.
928 Auto detection for B<--pie> and B<--bindnow> only works if at least one
929 command uses the required hardening flag (e.g. -fPIE). Then it's required for
930 all other commands as well.
934 The exit status is a "bit mask", each listed status is ORed when the error
935 condition occurs to get the result.
945 No compiler commands were found.
949 Invalid arguments/options given to blhc.
957 Missing hardening flags.
961 Hardening wrapper detected, no tests performed.
967 Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
969 =head1 COPYRIGHT AND LICENSE
971 Copyright (C) 2012 by Simon Ruderich
973 This program is free software: you can redistribute it and/or modify
974 it under the terms of the GNU General Public License as published by
975 the Free Software Foundation, either version 3 of the License, or
976 (at your option) any later version.
978 This program is distributed in the hope that it will be useful,
979 but WITHOUT ANY WARRANTY; without even the implied warranty of
980 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
981 GNU General Public License for more details.
983 You should have received a copy of the GNU General Public License
984 along with this program. If not, see <http://www.gnu.org/licenses/>.