/usr/share/lintian/checks/shared-libs is in lintian 2.5.10.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 1998 Christian Schwarz
#
# 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
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, you can find it on the World Wide
# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
package Lintian::shared_libs;
use strict;
use warnings;
use File::Basename;
use Lintian::Data;
use Lintian::Relation;
use Lintian::Tags qw(tag);
use Lintian::Util qw(fail slurp_entire_file);
# Libraries that should only be used in the presence of certain capabilities
# may be located in subdirectories of the standard ldconfig search path with
# one of the following names.
my $HWCAP_DIRS = Lintian::Data->new ('shared-libs/hwcap-dirs');
# The following architectures should always have a STACK setting in shared
# libraries to disable executable stack. Other architectures don't always add
# this section and therefore can't be checked.
my %stack_arches = map { $_ => 1 }
qw(
alpha
amd64
i386
m68k
powerpc
s390
sparc
);
my $ldconfig_dirs = Lintian::Data->new('shared-libs/ldconfig-dirs');
sub run {
my $file;
my $must_call_ldconfig;
my %SONAME;
my %sharedobject;
my @shlibs;
my @words;
# ---end-of-configuration-part---
my $pkg = shift;
my $type = shift;
my $info = shift;
my $proc = shift;
my $group = shift;
my $objdump = $info->objdump_info;
my @devpkgs;
# 1st step: get info about shared libraries installed by this package
foreach my $file (sort keys %{$objdump}) {
$SONAME{$file} = $objdump->{$file}->{SONAME}[0]
if defined $objdump->{$file}->{SONAME};
}
foreach my $file ($info->sorted_index) {
next unless length $file;
my $fileinfo = $info->file_info->{$file};
if ($fileinfo =~ m/^[^,]*\bELF\b/ && $fileinfo =~ m/shared object/) {
$sharedobject{$file} = 1;
}
}
if (%SONAME) {
foreach my $bin ($group->get_binary_processables) {
next unless $bin->pkg_name =~ m/\-dev$/;
if ($bin->info->relation ('strong')->implies ($pkg)) {
push @devpkgs, $bin;
}
}
}
# 2nd step: read package contents
for my $cur_file ($info->sorted_index) {
# shared library?
my $cur_file_data = $info->index->{$cur_file};
if (exists $SONAME{$cur_file} or
(defined $cur_file_data->link and exists $SONAME{abs_path(dirname($cur_file).'/'.$cur_file_data->link)})) {
# yes!!
my ($real_file, $perm);
if (exists $SONAME{$cur_file}) {
$real_file = $cur_file;
$perm = $cur_file_data->operm;
} else {
$real_file = abs_path (dirname ($cur_file) . '/' . $cur_file_data->link);
# perm not needed for this branch
}
# Installed in a directory controlled by the dynamic linker? We have
# to strip off directories named for hardware capabilities.
if (needs_ldconfig ($cur_file)) {
# yes! so postinst must call ldconfig
$must_call_ldconfig = $real_file;
}
# At this point, we do not want to process symlinks as they will only
# lead to duplicate warnings.
next unless $cur_file eq $real_file;
# Now that we're sure this is really a shared library, report on
# non-PIC problems.
if ($objdump->{$cur_file}->{TEXTREL}) {
tag 'shlib-with-non-pic-code', $cur_file;
}
my @symbol_names = map { @{$_}[2] } @{$objdump->{$cur_file}->{SYMBOLS}};
if ((grep /^_?exit$/, @symbol_names) && (!grep $_ eq 'fork', @symbol_names)) {
# If it has an INTERP section it might be an application with
# a SONAME (hi openjdk-6, see #614305). Also see the comment
# for "shlib-with-executable-bit" below.
tag 'shlib-calls-exit', $cur_file
unless $objdump->{$cur_file}->{INTERP};
}
# executable?
my $perms = sprintf ('%04o', $perm);
if ($perm & 0111) {
# Yes. But if the library has an INTERP section, it's
# designed to do something useful when executed, so don't
# report an error. Also give ld.so a pass, since it's
# special.
tag 'shlib-with-executable-bit', $cur_file, $perms
unless ($objdump->{$cur_file}->{INTERP}
or $cur_file =~ m,^lib(?:32|64)?/ld-[\d.]+\.so$,);
} elsif ($perm != 0644) {
tag 'shlib-with-bad-permissions', $cur_file, $perms;
}
# executable stack. We can only warn about a missing section on some
# architectures. Only warn if there's an Architecture field; if
# that's missing, we'll already be complaining elsewhere.
if (not defined $objdump->{$cur_file}->{STACK}) {
if (defined $info->field('architecture')) {
my $arch = $info->field('architecture');
tag 'shlib-without-PT_GNU_STACK-section', $cur_file
if $stack_arches{$arch};
}
} elsif ($objdump->{$cur_file}->{STACK} ne 'rw-') {
tag 'shlib-with-executable-stack', $cur_file;
}
} elsif ($ldconfig_dirs->known(dirname($cur_file))
&& exists $sharedobject{$cur_file}) {
tag 'sharedobject-in-library-directory-missing-soname', $cur_file;
} elsif ($cur_file =~ m/\.la$/ and not defined $cur_file_data->link) {
local $_;
open(LAFILE, '<', $info->unpacked($cur_file))
or fail("Could not open $cur_file for reading!");
while(<LAFILE>) {
next unless (m/^(libdir)='(.+?)'$/) or (m/^(dependency_libs)='(.+?)'$/);
my ($field, $value) = ($1, $2);
if ($field eq 'libdir') {
$value =~ s,/+$,,;
my ($expected) = ("/$cur_file" =~ m,^(.+)/[^/]+$,);
# python-central is a special case since the libraries are moved
# at install time.
next if ($value =~ m,^/usr/lib/python[\d.]+/(?:site|dist)-packages,
and $expected =~ m,^/usr/share/pyshared,);
tag 'incorrect-libdir-in-la-file', $cur_file, "$value != $expected"
unless($expected eq $value);
} elsif ($field eq 'dependency_libs'){
tag 'non-empty-dependency_libs-in-la-file', $cur_file;
}
}
close(LAFILE);
}
}
close(IN);
# 3rd step: check if shlib symlinks are present and in correct order
for my $shlib_file (keys %SONAME) {
# file found?
if (not exists $info->index->{$shlib_file}) {
fail("shlib $shlib_file not found in package (should not happen!)");
}
my ($dir, $shlib_name) = $shlib_file =~ m,(.*)/([^/]+)$,;
# not a public shared library, skip it
next unless $ldconfig_dirs->known($dir);
# symlink found?
my $link_file = "$dir/$SONAME{$shlib_file}";
if (not exists $info->index->{$link_file}) {
tag 'ldconfig-symlink-missing-for-shlib', "$link_file $shlib_file $SONAME{$shlib_file}";
} else {
# $link_file really another file?
if ($link_file eq $shlib_file) {
# the library file uses its SONAME, this is ok...
} else {
# $link_file really a symlink?
if ($info->index->{$link_file}->is_symlink) {
# yes.
# $link_file pointing to correct file?
if ($info->index->{$link_file}->link eq $shlib_name) {
# ok.
} else {
tag 'ldconfig-symlink-referencing-wrong-file',
"$link_file -> " . $info->index->{$link_file}->link . " instead of $shlib_name";
}
} else {
tag 'ldconfig-symlink-is-not-a-symlink', "$shlib_file $link_file";
}
}
}
# libtool "-release" variant
$link_file =~ s/-[\d\.]\.so$/.so/o;
# determine shlib link name (w/o version)
$link_file =~ s/\.so.+$/.so/o;
# shlib symlink may not exist.
# if shlib doesn't _have_ a version, then $link_file and $shlib_file will
# be equal, and it's not a development link, so don't complain.
if (exists $info->index->{$link_file} and $link_file ne $shlib_file) {
tag 'non-dev-pkg-with-shlib-symlink', "$shlib_file $link_file";
} elsif (@devpkgs) {
# -dev package - it needs a shlib symlink
my $ok = 0;
# If the shared library is in /lib, we have to look for the dev symlink
# in /lib
$link_file = "usr/$link_file" unless $shlib_file =~ m,^usr/,;
foreach my $devpkg (@devpkgs) {
if (exists $devpkg->info->index->{$link_file}) {
$ok = 1;
last;
}
}
tag 'dev-pkg-without-shlib-symlink', "$shlib_file $link_file"
unless $ok;
}
}
# 4th step: check shlibs control file
my $version = $info->field('version'); # may be undef in very broken packages
my $provides = $pkg;
$provides .= "( = $version)" if defined $version;
# Assume the version to be a non-native version to avoid
# uninitialization warnings later.
$version = '0-1' unless defined $version;
$provides = Lintian::Relation->and ($info->relation ('provides'), $provides);
my $shlibsf = $info->control('shlibs');
my $symbolsf = $info->control('symbols');
my %shlibs_control;
my %symbols_control;
# Libraries with no version information can't be represented by the shlibs
# format (but can be represented by symbols). We want to warn about them if
# they appear in public directories. If they're in private directories,
# assume they're plugins or private libraries and are safe.
my %unversioned_shlibs;
for (keys %SONAME) {
my $soname = format_soname($SONAME{$_});
if ($soname !~ / /) {
$unversioned_shlibs{$_} = 1;
tag 'shlib-without-versioned-soname', $_, $soname
if $ldconfig_dirs->known(dirname($_));
}
}
@shlibs = grep { !$unversioned_shlibs{$_} } keys %SONAME;
if ($#shlibs == -1) {
# no shared libraries included in package, thus shlibs control file should
# not be present
if (-f $shlibsf) {
tag 'pkg-has-shlibs-control-file-but-no-actual-shared-libs';
}
} else {
# shared libraries included, thus shlibs control file has to exist
if (not -f $shlibsf) {
if ($type ne 'udeb') {
for my $shlib (@shlibs) {
# skip it if it's not a public shared library
next unless $ldconfig_dirs->known(dirname($shlib));
tag 'no-shlibs-control-file', $shlib
unless is_nss_plugin ($shlib);
}
}
} else {
my %shlibs_control_used;
my @shlibs_depends;
open(SHLIBS, '<', $shlibsf)
or fail("cannot open control/shlibs for reading: $!");
while (<SHLIBS>) {
chop;
next if m/^\s*$/ or /^#/;
# We exclude udebs from the checks for correct shared library
# dependencies, since packages may contain dependencies on
# other udeb packages.
my $udeb='';
$udeb = 'udeb: ' if s/^udeb:\s+//o;
@words = split(/\s+/o,$_);
my $shlibs_string = $udeb.$words[0].' '.$words[1];
if ($shlibs_control{$shlibs_string}) {
tag 'duplicate-entry-in-shlibs-control-file', $shlibs_string;
} else {
$shlibs_control{$shlibs_string} = 1;
push (@shlibs_depends, join (' ', @words[2 .. $#words]))
unless $udeb;
}
}
close(SHLIBS);
my $shlib_name;
for my $shlib (@shlibs) {
$shlib_name = $SONAME{$shlib};
$shlib_name = format_soname($shlib_name);
$shlibs_control_used{$shlib_name} = 1;
$shlibs_control_used{'udeb: '.$shlib_name} = 1;
unless (exists $shlibs_control{$shlib_name}) {
# skip it if it's not a public shared library
next unless $ldconfig_dirs->known(dirname($shlib));
# no!!
tag 'shlib-missing-in-control-file', $shlib_name, 'for', $shlib
unless is_nss_plugin ($shlib);
}
}
for $shlib_name (keys %shlibs_control) {
tag 'unused-shlib-entry-in-control-file', $shlib_name
unless $shlibs_control_used{$shlib_name};
}
# Check that all of the packages listed as dependencies in the shlibs
# file are satisfied by the current package or its Provides.
# Normally, packages should only declare dependencies in their shlibs
# that they themselves can satisfy.
#
# Deduplicate the list of dependencies before warning so that we don't
# dupliate warnings.
my %seen;
@shlibs_depends = grep { !$seen{$_}++ } @shlibs_depends;
for my $depend (@shlibs_depends) {
unless ($provides->implies($depend)) {
tag 'shlibs-declares-dependency-on-other-package', $depend;
}
}
}
}
# 5th step: check symbols control file. Add back in the unversioned shared
# libraries, since they can still have symbols files.
if ($#shlibs == -1 and not %unversioned_shlibs) {
# no shared libraries included in package, thus symbols control file should
# not be present
if (-f $symbolsf) {
tag 'pkg-has-symbols-control-file-but-no-shared-libs';
}
} elsif (not -f $symbolsf) {
if ($type ne 'udeb') {
for my $shlib (@shlibs, keys %unversioned_shlibs) {
# skip it if it's not a public shared library
next unless $ldconfig_dirs->known(dirname($shlib));
tag 'no-symbols-control-file', $shlib
unless is_nss_plugin ($shlib);
}
}
} elsif (open(IN, '<', $symbolsf)) {
my $version_wo_rev = $version;
$version_wo_rev =~ s/^(.+)-([^-]+)$/$1/;
my ($full_version_count, $full_version_sym) = (0, undef);
my ($debian_revision_count, $debian_revision_sym) = (0, undef);
my ($soname, $dep_package, $dep);
my %symbols_control_used;
my @symbols_depends;
my $dep_templates = 0;
my $meta_info_seen = 0;
my $warned = 0;
my $symbol_count = 0;
while (<IN>) {
chomp;
next if m/^\s*$/ or /^#/;
if (m/^([^\s|*]\S+)\s\S+\s*(?:\(\S+\s+\S+\)|\#MINVER\#)?/) {
# soname, main dependency template
$soname = $1;
s/^\Q$soname\E\s*//;
$soname = format_soname($soname);
if ($symbols_control{$soname}) {
tag 'duplicate-entry-in-symbols-control-file', $soname;
} else {
$symbols_control{$soname} = 1;
$warned = 0;
foreach my $part (split /\s*,\s*/) {
foreach my $subpart (split /\s*\|\s*/, $part) {
$subpart =~ m,^(\S+)(\s*(?:\(\S+\s+\S+\)|#MINVER#))?$,;
($dep_package, $dep) = ($1, $2 || '');
if (defined $dep_package) {
push @symbols_depends, $dep_package . $dep;
} else {
tag 'syntax-error-in-symbols-file', $.
unless $warned;
$warned = 1;
}
}
}
}
$dep_templates = 0;
$meta_info_seen = 0;
$symbol_count = 0;
} elsif (m/^\|\s+\S+\s*(?:\(\S+\s+\S+\)|#MINVER#)?/) {
# alternative dependency template
$warned = 0;
if ($meta_info_seen or not defined $soname) {
tag 'syntax-error-in-symbols-file', $.;
$warned = 1;
}
s/^\|\s*//;
foreach my $part (split /\s*,\s*/) {
foreach my $subpart (split /\s*\|\s*/, $part) {
$subpart =~ m,^(\S+)(\s*(?:\(\S+\s+\S+\)|#MINVER#))?$,;
($dep_package, $dep) = ($1, $2 || '');
if (defined $dep_package) {
push @symbols_depends, $dep_package . $dep;
} else {
tag 'syntax-error-in-symbols-file', $. unless $warned;
$warned = 1;
}
}
}
$dep_templates++ unless $warned;
} elsif (m/^\*\s(\S+):\s\S+/) {
# meta-information
# This should probably be in a hash, but there's
# only one supported value currently
tag 'unknown-meta-field-in-symbols-file', "$1, line $."
unless $1 eq 'Build-Depends-Package';
tag 'syntax-error-in-symbols-file', $.
unless defined $soname and $symbol_count == 0;
$meta_info_seen = 1;
} elsif (m/^\s+(\S+)\s(\S+)(?:\s(\S+(?:\s\S+)?))?$/) {
# Symbol definition
tag 'syntax-error-in-symbols-file', $.
unless defined $soname;
$symbol_count++;
my ($sym, $v, $dep_order) = ($1, $2, $3);
$dep_order ||= '';
if (($v eq $version) and ($version =~ /-/)) {
$full_version_sym ||= $sym;
$full_version_count++;
} elsif (($v =~ /-/) and (not $v =~ /~$/) and ($v ne $version_wo_rev)) {
$debian_revision_sym ||= $sym;
$debian_revision_count++;
}
if (length $dep_order) {
if ($dep_order !~ /^\d+$/ or $dep_order > $dep_templates) {
tag 'invalid-template-id-in-symbols-file', $.;
}
}
} else {
# Unparseable line
tag 'syntax-error-in-symbols-file', $.;
}
}
close IN;
if ($full_version_count) {
$full_version_count--;
my $others = '';
if ($full_version_count > 0) {
$others = " and $full_version_count others";
}
tag 'symbols-file-contains-current-version-with-debian-revision',
"on symbol $full_version_sym$others";
}
if ($debian_revision_count) {
$debian_revision_count--;
my $others = '';
if ($debian_revision_count > 0) {
$others = " and $debian_revision_count others";
}
tag 'symbols-file-contains-debian-revision',
"on symbol $debian_revision_sym$others";
}
my $shlib_name;
for my $shlib (@shlibs, keys %unversioned_shlibs) {
$shlib_name = $SONAME{$shlib};
$shlib_name = format_soname($shlib_name);
$symbols_control_used{$shlib_name} = 1;
$symbols_control_used{'udeb: '.$shlib_name} = 1;
unless (exists $symbols_control{$shlib_name}) {
# skip it if it's not a public shared library
next unless $ldconfig_dirs->known(dirname($shlib));
tag 'shlib-missing-in-symbols-control-file', $shlib_name, 'for', $shlib
unless is_nss_plugin ($shlib);
}
}
for $shlib_name (keys %symbols_control) {
tag 'unused-shlib-entry-in-symbols-control-file', $shlib_name
unless $symbols_control_used{$shlib_name};
}
# Check that all of the packages listed as dependencies in the symbols
# file are satisfied by the current package or its Provides.
# Normally, packages should only declare dependencies in their symbols
# files that they themselves can satisfy.
#
# Deduplicate the list of dependencies before warning so that we don't
# dupliate warnings.
my %seen;
@symbols_depends = grep { !$seen{$_}++ } @symbols_depends;
for my $depend (@symbols_depends) {
unless ($provides->implies($depend)) {
tag 'symbols-declares-dependency-on-other-package', $depend;
}
}
}
# Compare the contents of the shlibs and symbols control files, but exclude
# from this check shared libraries whose SONAMEs has no version. Those can
# only be represented in symbols files and aren't expected in shlibs files.
if (keys %shlibs_control and keys %symbols_control) {
for my $key (keys %symbols_control) {
unless (exists $shlibs_control{$key} or $key !~ / /) {
tag 'symbols-declared-but-not-shlib', $key;
}
}
}
# 6th step: check pre- and post- control files
if (-f $info->control('preinst')) {
local $_ = slurp_entire_file($info->control('preinst'));
if (/^[^\#]*\bldconfig\b/m) {
tag 'preinst-calls-ldconfig';
}
}
my $we_call_postinst=0;
if (-f $info->control('postinst')) {
local $_ = slurp_entire_file($info->control('postinst'));
# Decide if we call ldconfig
if (/^[^\#]*\bldconfig\b/m) {
$we_call_postinst=1;
}
}
if ($type eq 'udeb') {
tag 'udeb-postinst-must-not-call-ldconfig'
if $we_call_postinst;
} else {
tag 'postinst-has-useless-call-to-ldconfig'
if $we_call_postinst and not $must_call_ldconfig;
tag 'postinst-must-call-ldconfig', $must_call_ldconfig
if not $we_call_postinst and $must_call_ldconfig;
}
my $multiarch = $info->field('multi-arch') // 'no';
if ($multiarch eq 'foreign' and $must_call_ldconfig) {
tag 'shlib-in-multi-arch-foreign-package', $must_call_ldconfig;
}
if (-f $info->control('prerm')) {
local $_ = slurp_entire_file($info->control('prerm'));
if (/^[^\#]*\bldconfig\b/m) {
tag 'prerm-calls-ldconfig';
}
}
if (-f $info->control('postrm')) {
local $_ = slurp_entire_file($info->control('postrm'));
# Decide if we call ldconfig
if (/^[^\#]*\bldconfig\b/m) {
tag 'postrm-has-useless-call-to-ldconfig',
unless $must_call_ldconfig;
} else {
tag 'postrm-should-call-ldconfig', $must_call_ldconfig
if $must_call_ldconfig;
}
# Decide if we do it safely
s/\bldconfig\b/BldconfigB/g;
s/[ \t]//g;
# this one matches code from debhelper
s/^if\["\$1"=.?remove.?\];?\n*then\n*BldconfigB//gm;
# variations...
s/^if\[.?remove.?="\$1"\];?\n*then\n*BldconfigB//gm;
s/^\["\$1"=.?remove.?\]\&&BldconfigB//gm;
s/^\[.?remove.?="\$1"\]&&BldconfigB//gm;
s/remove(?:\|[^)]+)*\).*?BldconfigB.*?(?:;;|esac)//s;
if (/^[^\#]*BldconfigB/m) {
tag 'postrm-unsafe-ldconfig';
}
}
}
# make /tmp/baz/baz.txt from /tmp/foo/../bar/../baz/baz.txt
sub abs_path {
my $path = shift;
while($path =~ s!/[^/]*/\.\./!/!g){1};
return $path;
}
# Extract the library name and the version from an SONAME and return them
# separated by a space. This code should match the split_soname function in
# dpkg-shlibdeps.
sub format_soname {
my $soname = shift;
# libfoo.so.X.X
if ($soname =~ /^(.*)\.so\.(.*)$/) {
$soname = "$1 $2";
# libfoo-X.X.so
} elsif ($soname =~ /^(.*)-(\d.*)\.so$/) {
$soname = "$1 $2";
}
return $soname
}
# Returns a truth value if the first argument appears to be the path
# to an libc nss plugin (libnss_<name>.so.$version).
sub is_nss_plugin {
my ($path) = @_;
return 1 if $path =~ m,^(.*/)?libnss_[^.]+\.so\.\d+$,o;
return 0;
}
sub needs_ldconfig {
my ($file) = @_;
my $dirname = dirname($file);
my $last;
do {
$dirname =~ s%/([^/]+)$%%;
$last = $1;
} while ($last && $HWCAP_DIRS->known ($last));
$dirname .= "/$last" if $last;
# yes! so postinst must call ldconfig
return 1 if $ldconfig_dirs->known ($dirname);
return;
}
1;
# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et
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