# Build log hardening check, checks build logs for missing hardening flags.
-# Copyright (C) 2012 Simon Ruderich
+# Copyright (C) 2012-2024 Simon Ruderich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
use Getopt::Long ();
use Text::ParseWords ();
-our $VERSION = '0.02';
+our $VERSION = '0.14';
# CONSTANTS/VARIABLES
my $cc_regex = qr/
(?<!\s-) # ignore options, e.g. "-c++" [sic!] (used by swig)
(?<!\.) # ignore file names, e.g. "test.gcc"
- (?:cc|gcc|g\+\+|c\+\+)
+ (?:cc|gcc|g\+\+|c\+\+|gfortran|mpicc|mpicxx|mpifort)
(?:-[\d.]+)? # version suffix, e.g. "gcc-4.6"
/x;
# Full regex which matches the complete compiler name. Used in a few places to
# prevent false negatives.
+my $cc_regex_full_prefix = qr/
+ [a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?
+ /x;
my $cc_regex_full = qr/
- (?:[a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?-)?
+ (?:$cc_regex_full_prefix-)?
$cc_regex
/x;
+# Regex to check if a line contains a compiler command.
+my $cc_regex_normal = qr/
+ \b$cc_regex(?:\s|\\)
+ /x;
+my $rustc_regex = qr/
+ \brustc\b
+ /x;
# Regex to catch (GCC) compiler warnings.
my $warning_regex = qr/^(.+?):(\d+):\d+: warning: (.+?) \[(.+?)\]$/;
+# Regex to catch libtool commands and not lines which show commands executed
+# by libtool (e.g. libtool: link: ...).
+my $libtool_regex = qr/\blibtool["']?\s.*--mode=/;
+my $libtool_link_regex = qr/\blibtool: link: /;
# List of source file extensions which require preprocessing.
my @source_preprocess_compile_cpp = (
# Objective-C++
qw( mm M ),
);
+my @source_preprocess_compile_fortran = (
+ # Fortran
+ qw( F FOR fpp FPP FTN F90 F95 F03 F08 ),
+);
my @source_preprocess_compile = (
# C
qw( c ),
# (Objective-)C++
@source_preprocess_compile_cpp,
# Fortran
- qw( F FOR fpp FPP FTN F90 F95 F03 F08 ),
+ @source_preprocess_compile_fortran,
);
my @source_preprocess_no_compile = (
# Assembly
# Objective-C++
qw( mii ),
);
+my @source_no_preprocess_compile_ada = (
+ # Ada source
+ qw( ada ),
+ # Ada body
+ qw( adb ),
+);
+my @source_no_preprocess_compile_fortran = (
+ # Fortran
+ qw( f for ftn f90 f95 f03 f08 ),
+);
my @source_no_preprocess_compile = (
# C
qw( i ),
# Objective-C
qw( mi ),
# Fortran
- qw( f for ftn f90 f95 f03 f08 ),
+ @source_no_preprocess_compile_fortran,
+ # Ada
+ @source_no_preprocess_compile_ada,
+);
+my @source_no_preprocess_no_compile_ada = (
+ # Ada specification
+ qw( ads ),
);
my @source_no_preprocess_no_compile = (
# Assembly
qw( s ),
+ # Ada
+ @source_no_preprocess_no_compile_ada,
);
my @source_no_preprocess = (
@source_no_preprocess_compile,
# C++
qw( hh H hp hxx hpp HPP h++ tcc ),
);
+# Object files.
+my @object = (
+ # Normal object files.
+ qw ( o ),
+ # Libtool object files.
+ qw ( lo la ),
+ # Dynamic libraries. bzip2 uses .sho.
+ qw ( so sho ),
+ # Static libraries.
+ qw ( a ),
+);
# Hashes for fast extensions lookup to check if a file falls in one of these
# categories.
my %extensions_no_preprocess = map { $_ => 1 } (
+ # There's no @header_no_preprocess.
@source_no_preprocess,
);
my %extensions_preprocess = map { $_ => 1 } (
@source_preprocess_compile_cpp,
@source_no_preprocess_compile_cpp,
);
+my %extensions_ada = map { $_ => 1 } (
+ @source_no_preprocess_compile_ada,
+ @source_no_preprocess_no_compile_ada,
+);
+my %extensions_fortran = map { $_ => 1 } (
+ @source_no_preprocess_compile_fortran,
+ @source_preprocess_compile_fortran,
+);
+my %extensions_object = map { $_ => 1 } (
+ @object,
+);
my %extension = map { $_ => 1 } (
@source_no_preprocess,
@header_preprocess,
@source_preprocess,
+ @object,
);
# Regexp to match file extensions.
# terminated with "\n".
/x;
-# Expected (hardening) flags. All flags are used as regexps.
+# Expected (hardening) flags. All flags are used as regexps (and compiled to
+# real regexps below for better execution speed).
my @def_cflags = (
- '-g',
- '-O(?:2|3)',
+ '-g3?',
+ '-O(?:2|3)', # keep at index 1, search for @def_cflags_debug to change it
+);
+my @def_cflags_debug = (
+ # These flags indicate a debug build which disables checks for -O2.
+ '-O0',
+ '-Og',
);
my @def_cflags_format = (
- '-Wformat',
+ '-Wformat(?:=2)?', # -Wformat=2 implies -Wformat, accept it too
'-Werror=format-security', # implies -Wformat-security
);
my @def_cflags_fortify = (
# fortify needs at least -O1, but -O2 is recommended anyway
);
my @def_cflags_stack = (
- '-fstack-protector',
- '--param=ssp-buffer-size=4',
+ '-fstack-protector', # keep first, used by cflags_stack_broken()
+ '--param[= ]ssp-buffer-size=4',
+);
+my @def_cflags_stack_strong = (
+ '-fstack-protector-strong', # keep first, used by cflags_stack_broken()
+);
+my @def_cflags_stack_bad = (
+ # Blacklist all stack protector options for simplicity.
+ '-fno-stack-protector',
+ '-fno-stack-protector-all',
+ '-fno-stack-protector-strong',
+);
+my @def_cflags_stack_clash = (
+ '-fstack-clash-protection',
);
my @def_cflags_pie = (
'-fPIE',
);
+my @def_cflags_branch_amd64 = (
+ '-fcf-protection',
+);
+my @def_cflags_branch_arm64 = (
+ '-mbranch-protection=standard',
+);
my @def_cxxflags = (
@def_cflags,
);
# @def_cxxflags_* is the same as @def_cflags_*.
my @def_cppflags = ();
my @def_cppflags_fortify = (
- '-D_FORTIFY_SOURCE=2', # must be first, see cppflags_fortify_broken()
+ '-D_FORTIFY_SOURCE=[23]', # must be first, see cppflags_fortify_broken()
+ # If you add another flag fix hack below (search for "Hack to fix") and
+ # $def_cppflags_fortify[0].
);
my @def_cppflags_fortify_bad = (
# These flags may overwrite -D_FORTIFY_SOURCE=2.
+ '-U_FORTIFY_SOURCE',
'-D_FORTIFY_SOURCE=0',
'-D_FORTIFY_SOURCE=1',
);
'-fpic',
'-shared',
);
-# References to all flags checked by the parser.
+# References to all flags checked by the flag checker.
my @flag_refs = (
\@def_cflags,
\@def_cflags_format,
\@def_cflags_fortify,
\@def_cflags_stack,
+ \@def_cflags_stack_strong,
+ \@def_cflags_stack_bad,
+ \@def_cflags_stack_clash,
\@def_cflags_pie,
+ \@def_cflags_branch_amd64,
+ \@def_cflags_branch_arm64,
\@def_cxxflags,
\@def_cppflags,
\@def_cppflags_fortify,
# References to all used flags.
my @flag_refs_all = (
@flag_refs,
+ \@def_cflags_debug,
\@def_cppflags_fortify_bad,
\@def_ldflags_pic,
);
# Renaming rules for the output so the regex parts are not visible. Also
# stores string values of flag regexps above, see compile_flag_regexp().
my %flag_renames = (
- '-O(?:2|3)' => '-O2',
- '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
- '-Wl,(?:-z,)?now' => '-Wl,-z,now',
+ '-g3?' => '-g',
+ '-O(?:2|3)' => '-O2',
+ '-Wformat(?:=2)?' => '-Wformat',
+ '--param[= ]ssp-buffer-size=4' => '--param=ssp-buffer-size=4',
+ '-D_FORTIFY_SOURCE=[23]' => '-D_FORTIFY_SOURCE=2',
+ '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
+ '-Wl,(?:-z,)?now' => '-Wl,-z,now',
);
my %exit_code = (
# FUNCTIONS
+sub split_line {
+ my ($line) = @_;
+
+ my @work = ($line);
+ foreach my $delim (';', '&&', '||') {
+ my @x;
+ foreach (@work) {
+ push @x, Text::ParseWords::parse_line(qr/\Q$delim\E/, 1, $_);
+ }
+ @work = @x;
+ }
+
+ return map {
+ # Ensure newline at the line end - necessary for
+ # correct parsing later.
+ $_ =~ s/\s+$//;
+ $_ .= "\n";
+ } @work;
+}
+
sub error_flags {
- my ($message, $missing_flags_ref, $flag_renames_ref, $line) = @_;
+ my ($message, $missing_flags_ref, $flag_renames_ref, $line, $number) = @_;
# Get string value of qr//-escaped regexps and if requested rename them.
my @missing_flags = map {
} @{$missing_flags_ref};
my $flags = join ' ', @missing_flags;
+ printf '%d:', $number if defined $number;
printf '%s (%s)%s %s',
error_color($message, 'red'), $flags, error_color(':', 'yellow'),
$line;
+
+ return;
}
sub error_non_verbose_build {
- my ($line) = @_;
+ my ($line, $number) = @_;
+ printf '%d:', $number if defined $number;
printf '%s%s %s',
error_color('NONVERBOSE BUILD', 'red'),
error_color(':', 'yellow'),
$line;
+
+ return;
}
sub error_invalid_cmake {
my ($version) = @_;
error_color('INVALID CMAKE', 'red'),
error_color(':', 'yellow'),
$version;
+
+ return;
}
sub error_hardening_wrapper {
printf "%s%s %s\n",
error_color('HARDENING WRAPPER', 'red'),
error_color(':', 'yellow'),
'no checks possible, aborting';
+
+ return;
}
sub error_color {
my ($message, $color) = @_;
@{$missing_flags_ref} = @missing_flags;
return 0;
}
+# Check if any of \@bad_flags occurs after $good_flag. Doesn't check if
+# $good_flag is present.
+sub flag_overwritten {
+ my ($line, $good_flag, $bad_flags) = @_;
+
+ if (not any_flags_used($line, @{$bad_flags})) {
+ return 0;
+ }
+
+ my $bad_pos = 0;
+ foreach my $flag (@{$bad_flags}) {
+ while ($line =~ /$flag/g) {
+ if ($bad_pos < $+[0]) {
+ $bad_pos = $+[0];
+ }
+ }
+ }
+ my $good_pos = 0;
+ while ($line =~ /$good_flag/g) {
+ $good_pos = $+[0];
+ }
+ if ($good_pos > $bad_pos) {
+ return 0;
+ }
+ return 1;
+}
sub cppflags_fortify_broken {
my ($line, $missing_flags) = @_;
- # This doesn't take the position into account, but is a simple solution.
- # And if the build system tries to force -D_FORTIFY_SOURCE=0/1, something
- # is wrong anyway.
+ # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
+ my $fortify_source = $def_cppflags_fortify[0];
- if (any_flags_used($line, @def_cppflags_fortify_bad)) {
- # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
- push @{$missing_flags}, $def_cppflags_fortify[0];
- return 1;
+ # Some build systems enable/disable fortify source multiple times, check
+ # the final result.
+ if (not flag_overwritten($line,
+ $fortify_source,
+ \@def_cppflags_fortify_bad)) {
+ return 0;
}
+ push @{$missing_flags}, $fortify_source;
+ return 1;
+}
- return 0;
+sub cflags_stack_broken {
+ my ($line, $missing_flags, $strong) = @_;
+
+ my $flag = $strong ? $def_cflags_stack_strong[0]
+ : $def_cflags_stack[0];
+
+ if (not flag_overwritten($line, $flag, \@def_cflags_stack_bad)) {
+ return 0;
+ }
+ push @{$missing_flags}, $flag;
+ return 1;
}
# Modifies $missing_flags_ref array.
}
sub is_non_verbose_build {
- my ($line, $next_line, $skip_ref) = @_;
+ my ($line, $cargo, $skip_ref, $input_ref, $line_offset, $line_count) = @_;
+
+ if ($line =~ /$libtool_regex/o) {
+ # libtool's --silent hides the real compiler flags.
+ if ($line =~ /\s--silent/) {
+ return 1;
+ # If --silent is not present, skip this line as some compiler flags
+ # might be missing (e.g. -fPIE) which are handled correctly by libtool
+ # internally. libtool displays the real compiler command on the next
+ # line, so the flags are checked as usual.
+ } else {
+ ${$skip_ref} = 1;
+ return 0;
+ }
+ }
if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
- or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
+ or $line =~ /^\s*[][\/0-9 ]*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
return 0;
#
# C++ compiler setting.
return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
+ return 0 if $line =~ /^\s*C\+\+ Library: stdc\+\+$/;
+ # "Compiling" non binary files.
+ return 0 if $line =~ /^\s*Compiling \S+\.(?:py|pyx|el)['"]?\s*(?:\.\.\.|because it changed\.)?$/;
+ return 0 if $line =~ /^\s*[Cc]ompiling catalog \S+\.po\b/;
+ # cargo build
+ return 0 if $cargo and $line =~ m{^\s*Compiling\s+\S+\s+v\S+(?:\s+\(/(?:<<PKGBUILDDIR>>|builds/\S+)\))?$};
# "Compiling" with no file name.
if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
# $file_extension_regex may need spaces around the filename.
my $file = $1;
# On the first pass we only check if this line is verbose or not.
- return 1 if not defined $next_line;
+ return 1 if not defined $input_ref;
- # Second pass, we have access to the next line.
+ # Second pass, we have access to the next lines.
${$skip_ref} = 0;
# CMake and other build systems print the non-verbose messages also when
# building verbose. If a compiler and the file name occurs in the next
- # line, treat it as verbose build.
+ # lines, treat it as verbose build.
if (defined $file) {
# Get filename, we can't use the complete path as only parts of it are
# used in the real compiler command.
$file =~ m{/([^/\s]+)$};
$file = $1;
- if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
- # We still have to skip the current line as it doesn't contain any
- # compiler commands.
- ${$skip_ref} = 1;
- return 0;
+ for (my $i = 1; $i <= $line_count; $i++) {
+ my $next_line = $input_ref->[$line_offset + $i];
+ last unless defined $next_line;
+
+ if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
+ # Not a non-verbose line, but we still have to skip the
+ # current line as it doesn't contain any compiler commands.
+ ${$skip_ref} = 1;
+ return 0;
+ }
}
}
return 1;
}
+# Remove @flags from $flag_refs_ref, uses $flag_renames_ref as reference.
sub remove_flags {
my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
or not exists $removes{$flag_renames_ref->{$_}})
} @{$flags};
}
+
+ return;
}
+# Modifies $flag_renames_ref hash.
sub compile_flag_regexp {
my ($flag_renames_ref, @flags) = @_;
my @result = ();
foreach my $flag (@flags) {
+ # Compile flag regexp for faster execution.
+ my $regex = qr/\s(['"]?)$flag\1(?:\s|\\)/;
+
# Store flag name in replacement string for correct flags in messages
# with qr//ed flag regexps.
- $flag_renames_ref->{qr/\s$flag(?:\s|\\)/}
+ $flag_renames_ref->{$regex}
= (exists $flag_renames_ref->{$flag})
? $flag_renames_ref->{$flag}
: $flag;
- # Compile flag regexp for faster execution.
- push @result, qr/\s$flag(?:\s|\\)/;
+ push @result, $regex;
}
return @result;
}
+# Does any extension in @extensions exist in %{$extensions_ref}?
sub extension_found {
my ($extensions_ref, @extensions) = @_;
- my $found = 0;
foreach my $extension (@extensions) {
if (exists $extensions_ref->{$extension}) {
- $found = 1;
- last;
+ return 1;
}
}
- return $found;
+ return 0;
}
my $option_all = 0;
my $option_arch = undef;
my $option_buildd = 0;
+my $option_debian = 0;
$option_color = 0;
+my $option_line_numbers = 0;
if (not Getopt::Long::GetOptions(
'help|h|?' => \$option_help,
'version' => \$option_version,
'color' => \$option_color,
'arch=s' => \$option_arch,
'buildd' => \$option_buildd,
+ 'debian' => \$option_debian,
+ 'line-numbers' => \$option_line_numbers,
)) {
require Pod::Usage;
Pod::Usage::pod2usage(2);
Pod::Usage::pod2usage(1);
}
if ($option_version) {
- print "blhc $VERSION Copyright (C) 2012 Simon Ruderich
+ print <<"EOF";
+blhc $VERSION Copyright (C) 2012-2024 Simon Ruderich
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-";
+EOF
exit 0;
}
# Same for arch specific ignore flags, but only prepare here.
if (scalar @option_ignore_arch_flag > 0) {
foreach my $ignore (@option_ignore_arch_flag) {
- my ($ignore_arch, $ignore_flag) = split ':', $ignore, 2;
+ my ($ignore_arch, $ignore_flag) = split /:/, $ignore, 2;
if (not $ignore_arch or not $ignore_flag) {
printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
}
# Precompile ignore line regexps, also anchor at beginning and end of line.
+# Additional entries are also extracted from the build log, see below.
foreach my $ignore (@option_ignore_line) {
$ignore = qr/^$ignore$/;
}
# Same for arch specific ignore lines.
if (scalar @option_ignore_arch_line > 0) {
foreach my $ignore (@option_ignore_arch_line) {
- my ($ignore_arch, $ignore_line) = split ':', $ignore, 2;
+ my ($ignore_arch, $ignore_line) = split /:/, $ignore, 2;
if (not $ignore_arch or not $ignore_line) {
printf STDERR 'Value "%s" invalid for option ignore-arch-line '
foreach my $file (@ARGV) {
print "checking '$file'...\n" if scalar @ARGV > 1;
+ -f $file or die "No such file: $file";
+
open my $fh, '<', $file or die $!;
# Architecture of this file.
my $harden_format = 1;
my $harden_fortify = 1;
my $harden_stack = 1;
+ my $harden_stack_strong = 1;
+ my $harden_stack_clash = 1;
+ my $harden_branch = 1;
my $harden_relro = 1;
my $harden_bindnow = $option_bindnow; # defaults to 0
my $harden_pie = $option_pie; # defaults to 0
+ # Number of parallel jobs to prevent false positives when detecting
+ # non-verbose builds. As not all jobs declare the number of parallel jobs
+ # use a large enough default.
+ my $parallel = 10;
+
+ # Don't check for PIE flags if automatically applied by the compiler. Only
+ # used in buildd and Debian mode.
+ my $disable_harden_pie = 0;
+ if ($option_debian) {
+ $disable_harden_pie = 1;
+ }
+
+ # Ignore additional false positives if cargo/rust is used
+ my $cargo = 0;
+
+ my $number = 0;
while (my $line = <$fh>) {
+ $number++;
+
# Detect architecture automatically unless overridden. For buildd logs
# only, doesn't use the dpkg-buildpackage header. Necessary to ignore
# build logs which aren't built (wrong architecture, build error,
# etc.).
- if (not $arch
- and $line =~ /^Architecture: (.+)$/) {
- $arch = $1;
+ if (not $arch) {
+ if (index($line, 'Build Architecture: ') == 0) {
+ $arch = substr $line, 20, -1; # -1 to ignore '\n' at the end
+ # For old logs (sbuild << 0.63.0-1).
+ } elsif (index($line, 'Architecture: ') == 0) {
+ $arch = substr $line, 14, -1; # -1 to ignore '\n' at the end
+ }
}
# dpkg-buildflags only provides hardening flags since 1.16.1, don't
#
# Packages which were built before 1.16.1 but used their own hardening
# flags are not checked.
+ #
+ # Strong stack protector is used since dpkg 1.17.11.
+ #
+ # Recent GCC versions automatically use PIE (only on supported
+ # architectures) and dpkg respects this properly since 1.18.15 and
+ # doesn't pass PIE flags manually.
if ($option_buildd
and index($line, 'Toolchain package versions: ') == 0) {
require Dpkg::Version;
- if (not $line =~ /\bdpkg-dev_(\S+)/
- or Dpkg::Version::version_compare($1, '1.16.1') < 0) {
+
+ my $disable = 1;
+ my $disable_strong = 1;
+ my $disable_clash = 1;
+ my $disable_branch = 1;
+
+ if ($line =~ /\bdpkg-dev_(\S+)/) {
+ if (Dpkg::Version::version_compare($1, '1.16.1') >= 0) {
+ $disable = 0;
+ }
+ if (Dpkg::Version::version_compare($1, '1.17.11') >= 0) {
+ $disable_strong = 0;
+ }
+ if (Dpkg::Version::version_compare($1, '1.18.15') >= 0) {
+ $disable_harden_pie = 1;
+ }
+ if (Dpkg::Version::version_compare($1, '1.22.0') >= 0) {
+ $disable_clash = 0;
+ $disable_branch = 0;
+ }
+ }
+
+ if ($disable) {
$harden_format = 0;
$harden_fortify = 0;
$harden_stack = 0;
$harden_bindnow = 0;
$harden_pie = 0;
}
+ if ($disable_strong) {
+ $harden_stack_strong = 0;
+ }
+ if ($disable_clash) {
+ $harden_stack_clash = 0;
+ }
+ if ($disable_branch) {
+ $harden_branch = 0;
+ }
}
# The following two versions of CMake in Debian obeyed CPPFLAGS, but
and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
if (not $option_buildd) {
error_invalid_cmake($1);
+ $exit |= $exit_code{invalid_cmake};
} else {
- print "$buildd_tag{invalid_cmake} $1\n";
+ print "$buildd_tag{invalid_cmake}|$1|\n";
}
- $exit |= $exit_code{invalid_cmake};
}
- # If hardening wrapper is used (wraps calls to gcc and adds hardening
- # flags automatically) we can't perform any checks, abort.
- if (index($line, 'Build-Depends: ') == 0
- and $line =~ /\bhardening-wrapper\b/) {
- if (not $option_buildd) {
- error_hardening_wrapper();
- } else {
- print "$buildd_tag{hardening_wrapper}\n";
+ # Debian's build daemons use "Filtered Build-Depends:" (or just
+ # "Build-Depends:" in older versions) for the build dependencies, but
+ # pbuilder uses "Depends:"; support both.
+ if (index($line, 'Filtered Build-Depends: ') == 0
+ or index($line, 'Build-Depends: ') == 0
+ or index($line, 'Depends: ') == 0) {
+ # If hardening wrapper is used (wraps calls to gcc and adds
+ # hardening flags automatically) we can't perform any checks,
+ # abort.
+ if ($line =~ /\bhardening-wrapper\b/) {
+ if (not $option_buildd) {
+ error_hardening_wrapper();
+ $exit |= $exit_code{hardening_wrapper};
+ } else {
+ print "$buildd_tag{hardening_wrapper}||\n";
+ }
+ next FILE;
+ }
+
+ if ($line =~ /\bcargo\b/) {
+ $cargo = 1;
}
- $exit |= $exit_code{hardening_wrapper};
- next FILE;
+ }
+
+ # This flags is not always available, but if it is use it.
+ if ($line =~ /^DEB_BUILD_OPTIONS=.*\bparallel=(\d+)/) {
+ $parallel = $1 * 2;
}
# We skip over unimportant lines at the beginning of the log to
# Input lines, contain only the lines with compiler commands.
my @input = ();
+ # Non-verbose lines in the input. Used to reduce calls to
+ # is_non_verbose_build() (which is quite slow) in the second loop when
+ # it's already clear if a line is non-verbose or not.
+ my @input_nonverbose = ();
+ # Input line number.
+ my @input_number = ();
my $continuation = 0;
my $complete_line = undef;
+ my $non_verbose;
while (my $line = <$fh>) {
+ $number++;
+
# And stop at the end of the build log. Package details (reported by
# the buildd logs) are not important for us. This also prevents false
# positives.
- last if $line =~ /^Build finished at \d{8}-\d{4}$/;
+ last if index($line, 'Build finished at ') == 0
+ and $line =~ /^Build finished at \d{8}-\d{4}$/;
+
+ if (not $continuation) {
+ $non_verbose = 0;
+ }
# Detect architecture automatically unless overridden.
if (not $arch
- and $line =~ /^dpkg-buildpackage: host architecture (.+)$/) {
- $arch = $1;
+ and index($line, 'dpkg-buildpackage: info: host architecture ') == 0) {
+ $arch = substr $line, 43, -1; # -1 to ignore '\n' at the end
+ # Older versions of dpkg-buildpackage
+ } elsif (not $arch
+ and index($line, 'dpkg-buildpackage: host architecture ') == 0) {
+ $arch = substr $line, 37, -1; # -1 to ignore '\n' at the end
+
+ # Old buildd logs use e.g. "host architecture is alpha", remove
+ # the "is", otherwise debarch_to_debtriplet() will not detect the
+ # architecture.
+ if (index($arch, 'is ') == 0) {
+ $arch = substr $arch, 3;
+ }
}
+ # Permit dynamic excludes from within the build log to ignore false
+ # positives. Cannot use a separate config file as we often only have
+ # the build log itself.
+ if (index($line, 'blhc: ignore-line-regexp: ') == 0) {
+ my $ignore = substr $line, 26, -1; # -1 to ignore '\n' at the end
+ push @option_ignore_line, qr/^$ignore$/;
+ next;
+ }
+
+ next if $line =~ /^\s*#/;
# Ignore compiler warnings for now.
next if $line =~ /$warning_regex/o;
- if (not $option_buildd and index($line, "\033") != -1) { # esc
+ if (not $option_buildd and index($line, "\033") != -1) { # \033 = esc
# Remove all ANSI color sequences which are sometimes used in
# non-verbose builds.
$line = Term::ANSIColor::colorstrip($line);
}
# Check if this line indicates a non verbose build.
- my $non_verbose = is_non_verbose_build($line);
+ my $skip = 0;
+ $non_verbose |= is_non_verbose_build($line, $cargo, \$skip);
+ next if $skip;
- # One line may contain multiple commands (";"). Treat each one as
- # single line. parse_line() is slow, only use it when necessary.
- my @line = (index($line, ';') == -1)
+ # Treat each command as a single line so we don't ignore valid
+ # commands when handling false positives. split_line() is slow, only
+ # use it when necessary.
+ my @line = ($line !~ /(?:;|&&|\|\|)/)
? ($line)
- : map {
- # Ensure newline at the line end - necessary for
- # correct parsing later.
- $_ =~ s/\s+$//;
- $_ .= "\n";
- } Text::ParseWords::parse_line(';', 1, $line);
+ : split_line($line);
foreach my $line (@line) {
if ($continuation) {
$continuation = 0;
$complete_line = undef;
}
+ my $noenv = $line;
+ # Strip (basic) environment variables for compiler detection. This
+ # prevents false positives when environment variables contain
+ # compiler binaries. Nested quotes, command substitution, etc. is
+ # not supported.
+ $noenv =~ s/^
+ \s*
+ (?:
+ [a-zA-Z_]+ # environment variable name
+ =
+ (?:
+ [^\s"'\$`\\]+ # non-quoted string
+ |
+ '[^"'\$`\\]*' # single-quoted string
+ |
+ "[^"'\$`\\]*" # double-quoted string
+ )
+ \s+
+ )*
+ //x;
# Ignore lines with no compiler commands.
next if not $non_verbose
- and not $line =~ /\b$cc_regex(?:\s|\\)/o;
+ and not $noenv =~ /$cc_regex_normal/o;
# Ignore lines with no filenames with extensions. May miss some
# non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
# a problem as the log will most likely contain other non-verbose
and $line =~ /^(?:checking|[Cc]onfigure:) /;
next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
[Cc]ompiler[\s.]*:?\s+
- /xo;
- next if $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex_full\s*$/o;
- # `moc-qt4`, contains '-I/usr/share/qt4/mkspecs/linux-g++' (or
- # similar for other architectures) which gets recognized as a
- # compiler line. Ignore it.
- next if $line =~ m{^/usr/bin/moc-qt4
+ /x;
+ next if $line =~ m{^\s*(?:-\s)?(?:HOST_)?(?:CC|CXX)
+ \s*=\s*$cc_regex_full
+ # optional compiler options, don't allow
+ # "everything" here to prevent false negatives
+ \s*(?:\s-\S+)*\s*$}xo;
+ # `echo` is never a compiler command
+ next if $line =~ /^\s*echo\s/;
+ # Ignore calls to `make` because they can contain environment
+ # variables which look like compiler commands, e.g. CC=).
+ next if $line =~ /^\s*make\s/;
+ # `moc-qt4`/`moc-qt5` contain '-I.../linux-g++' in their command
+ # line (or similar for other architectures) which gets recognized
+ # as a compiler line, but `moc-qt*` is only a preprocessor for Qt
+ # C++ files. No hardening flags are relevant during this step,
+ # thus ignore `moc-qt*` lines. The resulting files will be
+ # compiled in a separate step (and therefore checked).
+ next if $line =~ m{^\S+(?:/bin/moc(?:-qt[45])?|/lib/qt6/libexec/moc)
\s.+\s
- -I/usr/share/qt4/mkspecs/[a-z]+-g\++(?:-64)?
+ -I\S+/mkspecs/[a-z]+-g\++(?:-64)?
\s}x;
+ # nvcc is not a regular C compiler
+ next if $line =~ m{^\S+/bin/nvcc\s};
+ # Ignore false positives when the line contains only CC=gcc but no
+ # other gcc command.
+ if ($line =~ /(.*)CC=$cc_regex_full(.*)/o) {
+ my $before = $1;
+ my $after = $2;
+ next if not $before =~ /$cc_regex_normal/o
+ and not $after =~ /$cc_regex_normal/o;
+ }
+ # Ignore false positives caused by gcc -v. It outputs a line
+ # looking like a normal compiler line but which is sometimes
+ # missing hardening flags, although the normal compiler line
+ # contains them.
+ next if $line =~ m{^\s+/usr/lib/gcc/$cc_regex_full_prefix/
+ [0-9.]+/cc1(?:plus)?}xo;
+ # Ignore false positive with `rm` which may remove files which
+ # look like a compiler executable thus causing the line to be
+ # treated as a normal compiler line.
+ next if $line =~ m{^\s*rm\s+};
+ next if $line =~ m{^\s*dwz\s+};
+ # Some build systems emit "gcc > file".
+ next if $line =~ m{$cc_regex_normal\s*>\s*\S+}o;
+ # Hex output may contain "cc".
+ next if $line =~ m#(?:\b[0-9a-fA-F]{2,}\b\s*){5}#;
+ # Meson build output
+ next if $line =~ /^C\+\+ linker for the host machine: /;
+ # Embedded `gcc -print-*` commands
+ next if $line =~ /`$cc_regex_normal\s*[^`]*-print-\S+`/;
+ # cmake checking for compiler flags without setting CPPFLAGS
+ next if $line =~ m{^\s*/usr/(bin|lib)/(ccache/)?c\+\+ (?:-std=\S+ )?-dM -E -c /usr/share/cmake-\S+/Modules/CMakeCXXCompilerABI\.cpp};
+ # Some rustc lines look like linker commands
+ next if $cargo and $line =~ /$rustc_regex/o;
# Check if additional hardening options were used. Used to ensure
# they are used for the complete build.
$harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
push @input, $line;
+ push @input_nonverbose, $non_verbose;
+ push @input_number, $number if $option_line_numbers;
}
}
}
if (scalar @input == 0) {
- if (not $option_buildd) {
- print "No compiler commands!\n";
- } else {
- print "$buildd_tag{no_compiler_commands}\n";
+ if (not $cargo) {
+ if (not $option_buildd) {
+ print "No compiler commands!\n";
+ $exit |= $exit_code{no_compiler_commands};
+ } else {
+ print "$buildd_tag{no_compiler_commands}||\n";
+ }
}
- $exit |= $exit_code{no_compiler_commands};
next FILE;
}
}
# Option or auto detected.
+ my @harden_branch_flags;
if ($arch) {
- # The following was partially copied from dpkg-dev 1.16.1.2
- # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, add_hardening_flags()),
- # copyright Raphaël Hertzog <hertzog@debian.org>, Kees Cook
- # <kees@debian.org>, Canonical, Ltd. licensed under GPL version 2 or
- # later. Keep it in sync.
+ # The following was partially copied from dpkg-dev 1.22.0
+ # (/usr/share/perl5/Dpkg/Vendor/Debian.pm, set_build_features and
+ # _add_build_flags()), copyright Raphaël Hertzog <hertzog@debian.org>,
+ # Guillem Jover <guillem@debian.org>, Kees Cook <kees@debian.org>,
+ # Canonical, Ltd. licensed under GPL version 2 or later. Keep it in
+ # sync.
require Dpkg::Arch;
- my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
+ my ($os, $cpu);
+ # Recent dpkg versions use a quadruplet for arch. Support both.
+ eval {
+ (undef, undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtuple($arch);
+ };
+ if ($@) {
+ (undef, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
+ }
+
+ my %builtin_pie_arch = map { $_ => 1 } qw(
+ amd64
+ arm64
+ armel
+ armhf
+ hurd-amd64
+ hurd-i386
+ i386
+ kfreebsd-amd64
+ kfreebsd-i386
+ loong64
+ mips
+ mips64
+ mips64el
+ mips64r6
+ mips64r6el
+ mipsel
+ mipsn32
+ mipsn32el
+ mipsn32r6
+ mipsn32r6el
+ mipsr6
+ mipsr6el
+ powerpc
+ ppc64
+ ppc64el
+ riscv64
+ s390x
+ sparc
+ sparc64
+ );
# Disable unsupported hardening options.
- if ($cpu =~ /^(?:ia64|alpha|mips|mipsel|hppa)$/ or $arch eq 'arm') {
+ if ($disable_harden_pie and exists $builtin_pie_arch{$arch}) {
+ $harden_pie = 0;
+ }
+ if ($os !~ /^(?:linux|kfreebsd|hurd)$/
+ or $cpu =~ /^(?:alpha|hppa|ia64)$/) {
+ $harden_pie = 0;
+ }
+ if ($cpu =~ /^(?:ia64|alpha|hppa|nios2)$/ or $arch eq 'arm') {
$harden_stack = 0;
+ $harden_stack_strong = 0;
}
- if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
+ if ($arch !~ /^(?:amd64|arm64|armhf|armel)$/) {
+ $harden_stack_clash = 0;
+ }
+ if ($cpu =~ /^(?:ia64|hppa)$/) {
$harden_relro = 0;
$harden_bindnow = 0;
}
+ if ($cpu eq 'amd64') {
+ @harden_branch_flags = @def_cflags_branch_amd64;
+ } elsif ($cpu eq 'arm64') {
+ @harden_branch_flags = @def_cflags_branch_arm64;
+ }
}
# Default values.
@cxxflags = (@cxxflags, @def_cflags_pie);
@ldflags = (@ldflags, @def_ldflags_pie);
}
- if ($harden_stack) {
+ if ($harden_stack_strong) {
+ @cflags = (@cflags, @def_cflags_stack_strong);
+ @cxxflags = (@cxxflags, @def_cflags_stack_strong);
+ } elsif ($harden_stack) {
@cflags = (@cflags, @def_cflags_stack);
@cxxflags = (@cxxflags, @def_cflags_stack);
}
+ if ($harden_stack_clash) {
+ @cflags = (@cflags, @def_cflags_stack_clash);
+ @cxxflags = (@cxxflags, @def_cflags_stack_clash);
+ }
if ($harden_fortify) {
@cflags = (@cflags, @def_cflags_fortify);
@cxxflags = (@cxxflags, @def_cflags_fortify);
@cflags = (@cflags, @def_cflags_format);
@cxxflags = (@cxxflags, @def_cflags_format);
}
+ if ($harden_branch and @harden_branch_flags) {
+ @cflags = (@cflags, @harden_branch_flags);
+ @cxxflags = (@cxxflags, @harden_branch_flags);
+ }
if ($harden_relro) {
@ldflags = (@ldflags, @def_ldflags_relro);
}
@ldflags = (@ldflags, @def_ldflags_bindnow);
}
+ # Ada doesn't support format hardening flags, see #680117 for more
+ # information. Same for fortran.
+ my @cflags_backup;
+ my @cflags_noformat = grep {
+ my $ok = 1;
+ foreach my $flag (@def_cflags_format) {
+ $ok = 0 if $_ eq $flag;
+ }
+ $ok;
+ } @cflags;
+
+ # Hack to fix cppflags_fortify_broken() if --ignore-flag
+ # -D_FORTIFY_SOURCE=2 is used to ignore missing fortification. Only works
+ # as long as @def_cppflags_fortify contains only one variable.
+ if (scalar @def_cppflags_fortify == 0) {
+ $harden_fortify = 0;
+ }
+
# Ignore flags for this arch if requested.
if ($arch and exists $option_ignore_arch_flag{$arch}) {
- my @flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
+ my @local_flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
- remove_flags(\@flag_refs,
+ remove_flags(\@local_flag_refs,
\%flag_renames,
@{$option_ignore_arch_flag{$arch}});
}
}
my $skip = 0;
- if (is_non_verbose_build($line, $input[$i + 1], \$skip)) {
+ if ($input_nonverbose[$i]
+ and is_non_verbose_build($line, $cargo, \$skip,
+ \@input, $i, $parallel)) {
if (not $option_buildd) {
- error_non_verbose_build($line);
+ error_non_verbose_build($line, $input_number[$i]);
+ $exit |= $exit_code{non_verbose_build};
} else {
$statistics{commands_nonverbose}++;
}
- $exit |= $exit_code{non_verbose_build};
next;
}
- # Even if it's a verbose build, we might have to skip this line.
+ # Even if it's a verbose build, we might have to skip this line (see
+ # is_non_verbose_build()).
next if $skip;
+ my $orig_line = $line;
+
# Remove everything until and including the compiler command. Makes
# checks easier and faster.
$line =~ s/^.*?$cc_regex//o;
# "([...] test.c)" is not detected as 'test.c' - fix this by removing
- # the brace and similar characters.
+ # the brace and similar characters at the line end.
$line =~ s/['")]+$//;
# Skip unnecessary tests when only preprocessing.
}
# These file types require preprocessing.
if (extension_found(\%extensions_preprocess, @extensions)) {
- $preprocess = 1;
+ # Prevent false positives with "libtool: link: g++ -include test.h
+ # .." compiler lines.
+ if ($orig_line !~ /$libtool_link_regex/o) {
+ $preprocess = 1;
+ }
}
- # If there are source files then it's compiling/linking in one step
- # and we must check both. We only check for source files here, because
- # header files cause too many false positives.
- if (not $flag_preprocess
- and extension_found(\%extensions_compile_link, @extensions)) {
- # Assembly files don't need CFLAGS.
- if (not extension_found(\%extensions_compile, @extensions)
- and extension_found(\%extensions_no_compile, @extensions)) {
- $compile = 0;
- # But the rest does.
- } else {
- $compile = 1;
+ if (not $flag_preprocess) {
+ # If there are source files then it's compiling/linking in one
+ # step and we must check both. We only check for source files
+ # here, because header files cause too many false positives.
+ if (extension_found(\%extensions_compile_link, @extensions)) {
+ # Assembly files don't need CFLAGS.
+ if (not extension_found(\%extensions_compile, @extensions)
+ and extension_found(\%extensions_no_compile, @extensions)) {
+ $compile = 0;
+ # But the rest does.
+ } else {
+ $compile = 1;
+ }
+ # No compilable extensions found, either linking or compiling
+ # header flags.
+ #
+ # If there are also no object files we are just compiling headers
+ # (.h -> .h.gch). Don't check for linker flags in this case. Due
+ # to our liberal checks for compiler lines, this also reduces the
+ # number of false positives considerably.
+ } elsif ($link
+ and not extension_found(\%extensions_object, @extensions)) {
+ $link = 0;
}
}
+ my $compile_cpp = 0;
+ my $restore_cflags = 0;
# Assume CXXFLAGS are required when a C++ file is specified in the
# compiler line.
- my $compile_cpp = 0;
if ($compile
and extension_found(\%extensions_compile_cpp, @extensions)) {
$compile = 0;
$compile_cpp = 1;
+ # Ada needs special CFLAGS
+ } elsif (extension_found(\%extensions_ada, @extensions)) {
+ $restore_cflags = 1;
+ $preprocess = 0; # Ada uses no CPPFLAGS
+ @cflags_backup = @cflags;
+ @cflags = @cflags_noformat;
+ # Same for fortran
+ } elsif (extension_found(\%extensions_fortran, @extensions)) {
+ $restore_cflags = 1;
+ @cflags_backup = @cflags;
+ @cflags = @cflags_noformat;
}
if ($option_buildd) {
$statistics{link}++ if $link;
}
+ # Check if there are flags indicating a debug build. If that's true,
+ # skip the check for -O2. This prevents fortification, but that's fine
+ # for a debug build.
+ if (any_flags_used($line, @def_cflags_debug)) {
+ remove_flags([\@cflags], \%flag_renames, $def_cflags[1]);
+ remove_flags([\@cppflags], \%flag_renames, $def_cppflags_fortify[0]);
+ }
+
# Check hardening flags.
my @missing;
- if ($compile and not all_flags_used($line, \@missing, @cflags)
+ if ($compile and (not all_flags_used($line, \@missing, @cflags)
+ or (($harden_stack or $harden_stack_strong)
+ and cflags_stack_broken($line, \@missing,
+ $harden_stack_strong)))
# Libraries linked with -fPIC don't have to (and can't) be
# linked with -fPIE as well. It's no error if only PIE flags
# are missing.
# Assume dpkg-buildflags returns the correct flags.
and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
if (not $option_buildd) {
- error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ error_flags('CFLAGS missing', \@missing, \%flag_renames,
+ $input[$i], $input_number[$i]);
+ $exit |= $exit_code{flags_missing};
} else {
$statistics{compile_missing}++;
}
- $exit |= $exit_code{flags_missing};
} elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
# Libraries linked with -fPIC don't have to (and can't) be
# linked with -fPIE as well. It's no error if only PIE flags
# Assume dpkg-buildflags returns the correct flags.
and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
if (not $option_buildd) {
- error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ error_flags('CXXFLAGS missing', \@missing, \%flag_renames,
+ $input[$i], $input_number[$i]);
+ $exit |= $exit_code{flags_missing};
} else {
$statistics{compile_cpp_missing}++;
}
- $exit |= $exit_code{flags_missing};
}
if ($preprocess
and (not all_flags_used($line, \@missing, @cppflags)
# Assume dpkg-buildflags returns the correct flags.
and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
if (not $option_buildd) {
- error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ error_flags('CPPFLAGS missing', \@missing, \%flag_renames,
+ $input[$i], $input_number[$i]);
+ $exit |= $exit_code{flags_missing};
} else {
$statistics{preprocess_missing}++;
}
- $exit |= $exit_code{flags_missing};
}
if ($link and not all_flags_used($line, \@missing, @ldflags)
# Same here, -fPIC conflicts with -fPIE.
# Assume dpkg-buildflags returns the correct flags.
and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
if (not $option_buildd) {
- error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ error_flags('LDFLAGS missing', \@missing, \%flag_renames,
+ $input[$i], $input_number[$i]);
+ $exit |= $exit_code{flags_missing};
} else {
$statistics{link_missing}++;
}
- $exit |= $exit_code{flags_missing};
+ }
+
+ # Restore normal CFLAGS.
+ if ($restore_cflags) {
+ @cflags = @cflags_backup;
}
}
}
}
if (scalar @warning) {
local $" = ', '; # array join string
- print "$buildd_tag{flags_missing} @warning missing\n";
+ print "$buildd_tag{flags_missing}|@warning missing|\n";
}
if ($statistics{commands_nonverbose}) {
- printf "$buildd_tag{non_verbose_build} %d (of %d) hidden\n",
+ printf "$buildd_tag{non_verbose_build}|%d (of %d) hidden|\n",
$statistics{commands_nonverbose},
$statistics{commands},
}
licensed under the GPL 3 or later.
It's designed to check build logs generated by Debian's dpkg-buildpackage (or
-tools using dpkg-buildpackage like pbuilder or the official buildd build logs)
-to help maintainers detect missing hardening flags in their packages.
+tools using dpkg-buildpackage like pbuilder or sbuild (which is used for the
+official buildd build logs)) to help maintainers detect missing hardening
+flags in their packages.
+
+Only gcc is detected as compiler at the moment. If other compilers support
+hardening flags as well, please report them.
If there's no output, no flags are missing and the build log is fine.
+See F<README> for details about performed checks, auto-detection and
+limitations.
+
+=head1 FALSE POSITIVES
+
+To suppress false positives you can embed the following string in the build
+log:
+
+ blhc: ignore-line-regexp: REGEXP
+
+All lines fully matching REGEXP (see B<--ignore-line> for details) will be
+ignored. The string can be embedded multiple times to ignore different
+regexps.
+
+Please use this feature sparingly so that missing flags are not overlooked. If
+you find false positives which affect more packages please report a bug.
+
+To generate this string simply use echo in C<debian/rules>; make sure to use @
+to suppress the echo command itself as it could also trigger a false positive.
+If the build process takes a long time edit the C<.build> file in place and
+tweak the ignore string until B<blhc --all --debian package.build> no longer
+reports any false positives.
+
=head1 OPTIONS
=over 8
Don't require Term::ANSIColor.
+=item *
+
+Return exit code 0, unless there was a error (-I, -W messages don't count as
+error).
+
=back
+=item B<--debian>
+
+Apply Debian-specific settings. At the moment this only disables checking for
+PIE which is automatically applied by Debian's GCC and no longer requires a
+compiler command line argument.
+
=item B<--color>
Use colored (ANSI) output for warning messages.
+=item B<--line-numbers>
+
+Display line numbers.
+
=item B<--ignore-arch> I<arch>
Ignore build logs from architectures matching I<arch>. I<arch> is a string.
pbuilder path/to/package.dsc | tee path/log/file
blhc path/to/file || echo flags missing
+Assume this build log was created on a Debian system and thus don't warn about
+missing PIE flags if the current architecture injects them automatically (this
+is enabled in buildd mode per default). C<--arch> is necessary if the build
+log contains no architecture information as written by dpkg-buildpackage.
+
+ blhc --debian --all --arch=amd64 path/to/log/file
+
=head1 BUILDD TAGS
The following tags are used in I<--buildd> mode. In braces the additional data
Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
-=head1 COPYRIGHT AND LICENSE
+=head1 LICENSE AND COPYRIGHT
-Copyright (C) 2012 by Simon Ruderich
+Copyright (C) 2012-2024 by Simon Ruderich
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by