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perl/perl-5.25.2-Don-t-let-XSLoader-load-relative-paths.patch

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Do not let XSLoader load relative paths (bz #1353238)
2016-07-07 11:30:02 +00:00
From 08e3451d7b3b714ad63a27f1b9c2a23ee75d15ee Mon Sep 17 00:00:00 2001
From: Father Chrysostomos <sprout@cpan.org>
Date: Sat, 2 Jul 2016 22:56:51 -0700
Subject: [PATCH 1/4] =?UTF-8?q?Don=E2=80=99t=20let=20XSLoader=20load=20rel?=
=?UTF-8?q?ative=20paths?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
[rt.cpan.org #115808]
The logic in XSLoader for determining the library goes like this:
my $c = () = split(/::/,$caller,-1);
$modlibname =~ s,[\\/][^\\/]+$,, while $c--; # Q&D basename
my $file = "$modlibname/auto/$modpname/$modfname.bundle";
(That last line varies by platform.)
$caller is the calling package. $modlibname is the calling file. It
removes as many path segments from $modlibname as there are segments
in $caller. So if you have Foo/Bar/XS.pm calling XSLoader from the
Foo::Bar package, the $modlibname will end up containing the path in
@INC where XS.pm was found, followed by "/Foo". Usually the fallback
to Dynaloader::bootstrap_inherit, which does an @INC search, makes
things Just Work.
But if our hypothetical Foo/Bar/XS.pm actually calls
XSLoader::load from inside a string eval, then path ends up being
"(eval 1)/auto/Foo/Bar/Bar.bundle".
So if someone creates a directory named ‘(eval 1)’ with a naughty
binary file in it, it will be loaded if a script using Foo::Bar is run
in the parent directory.
This commit makes XSLoader fall back to Dynaloader’s @INC search if
the calling file has a relative path that is not found in @INC.
---
dist/XSLoader/XSLoader_pm.PL | 25 +++++++++++++++++++++++++
dist/XSLoader/t/XSLoader.t | 27 ++++++++++++++++++++++++++-
2 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/dist/XSLoader/XSLoader_pm.PL b/dist/XSLoader/XSLoader_pm.PL
index 8a8852e..749f72d 100644
--- a/dist/XSLoader/XSLoader_pm.PL
+++ b/dist/XSLoader/XSLoader_pm.PL
@@ -91,6 +91,31 @@ print OUT <<'EOT';
my $modpname = join('/',@modparts);
my $c = () = split(/::/,$caller,-1);
$modlibname =~ s,[\\/][^\\/]+$,, while $c--; # Q&D basename
+ # Does this look like a relative path?
+ if ($modlibname !~ m|^[\\/]|) {
+ # Someone may have a #line directive that changes the file name, or
+ # may be calling XSLoader::load from inside a string eval. We cer-
+ # tainly do not want to go loading some code that is not in @INC,
+ # as it could be untrusted.
+ #
+ # We could just fall back to DynaLoader here, but then the rest of
+ # this function would go untested in the perl core, since all @INC
+ # paths are relative during testing. That would be a time bomb
+ # waiting to happen, since bugs could be introduced into the code.
+ #
+ # So look through @INC to see if $modlibname is in it. A rela-
+ # tive $modlibname is not a common occurrence, so this block is
+ # not hot code.
+ FOUND: {
+ for (@INC) {
+ if ($_ eq $modlibname) {
+ last FOUND;
+ }
+ }
+ # Not found. Fall back to DynaLoader.
+ goto \&XSLoader::bootstrap_inherit;
+ }
+ }
EOT
my $dl_dlext = quotemeta($Config::Config{'dlext'});
diff --git a/dist/XSLoader/t/XSLoader.t b/dist/XSLoader/t/XSLoader.t
index 2ff11fe..1e86faa 100644
--- a/dist/XSLoader/t/XSLoader.t
+++ b/dist/XSLoader/t/XSLoader.t
@@ -33,7 +33,7 @@ my %modules = (
'Time::HiRes'=> q| ::can_ok( 'Time::HiRes' => 'usleep' ) |, # 5.7.3
);
-plan tests => keys(%modules) * 3 + 9;
+plan tests => keys(%modules) * 3 + 10;
# Try to load the module
use_ok( 'XSLoader' );
@@ -125,3 +125,28 @@ XSLoader::load("Devel::Peek");
EOS
or ::diag $@;
}
+
+SKIP: {
+ skip "File::Path not available", 1
+ unless eval { require File::Path };
+ my $name = "phooo$$";
+ File::Path::make_path("$name/auto/Foo/Bar");
+ open my $fh,
+ ">$name/auto/Foo/Bar/Bar.$Config::Config{'dlext'}";
+ close $fh;
+ my $fell_back;
+ local *XSLoader::bootstrap_inherit = sub {
+ $fell_back++;
+ # Break out of the calling subs
+ goto the_test;
+ };
+ eval <<END;
+#line 1 $name
+package Foo::Bar;
+XSLoader::load("Foo::Bar");
+END
+ the_test:
+ ok $fell_back,
+ 'XSLoader will not load relative paths based on (caller)[1]';
+ File::Path::remove_tree($name);
+}
--
2.5.5
From 5993d6620f29d22b0a72701f4f0fdacff3d25460 Mon Sep 17 00:00:00 2001
From: Father Chrysostomos <sprout@cpan.org>
Date: Sat, 2 Jul 2016 22:57:46 -0700
Subject: [PATCH 2/4] Increase $XSLoader::VERSION to 0.22
---
dist/XSLoader/XSLoader_pm.PL | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/dist/XSLoader/XSLoader_pm.PL b/dist/XSLoader/XSLoader_pm.PL
index 749f72d..7e24b83 100644
--- a/dist/XSLoader/XSLoader_pm.PL
+++ b/dist/XSLoader/XSLoader_pm.PL
@@ -11,7 +11,7 @@ print OUT <<'EOT';
package XSLoader;
-$VERSION = "0.21";
+$VERSION = "0.22";
#use strict;
--
2.5.5
From a651dcdf6a9151150dcf0fb6b18849d3e39b0811 Mon Sep 17 00:00:00 2001
From: Father Chrysostomos <sprout@cpan.org>
Date: Mon, 4 Jul 2016 08:48:57 -0700
Subject: [PATCH 3/4] Fix XSLoader to recognize drive letters
Commit 08e3451d made XSLoader confirm that the file path it got
from (caller)[2] was in @INC if it looked like a relative path.
Not taking drive letters into account, it made that @INC search
mandatory on Windows and some other systems. It still worked, but
was slightly slower.
---
dist/XSLoader/XSLoader_pm.PL | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/dist/XSLoader/XSLoader_pm.PL b/dist/XSLoader/XSLoader_pm.PL
index 7e24b83..2efb99e 100644
--- a/dist/XSLoader/XSLoader_pm.PL
+++ b/dist/XSLoader/XSLoader_pm.PL
@@ -91,8 +91,20 @@ print OUT <<'EOT';
my $modpname = join('/',@modparts);
my $c = () = split(/::/,$caller,-1);
$modlibname =~ s,[\\/][^\\/]+$,, while $c--; # Q&D basename
+EOT
+
+my $to_print = <<'EOT';
# Does this look like a relative path?
- if ($modlibname !~ m|^[\\/]|) {
+ if ($modlibname !~ m{regexp}) {
+EOT
+
+$to_print =~ s~regexp~
+ $^O eq 'MSWin32' || $^O eq 'os2' || $^O eq 'cygwin' || $^O eq 'amigaos'
+ ? '^(?:[A-Za-z]:)?[\\\/]' # Optional drive letter
+ : '^/'
+~e;
+
+print OUT $to_print, <<'EOT';
# Someone may have a #line directive that changes the file name, or
# may be calling XSLoader::load from inside a string eval. We cer-
# tainly do not want to go loading some code that is not in @INC,
--
2.5.5
From ae635bbffa4769051671b9832a7472b9d977c198 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Aperghis-Tramoni?= <sebastien@aperghis.net>
Date: Tue, 5 Jul 2016 14:53:08 -0700
Subject: [PATCH 4/4] Synchronize blead with CPAN XSLoader 0.22
---
dist/XSLoader/XSLoader_pm.PL | 2 +-
dist/XSLoader/t/XSLoader.t | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/dist/XSLoader/XSLoader_pm.PL b/dist/XSLoader/XSLoader_pm.PL
index 2efb99e..09f9d4b 100644
--- a/dist/XSLoader/XSLoader_pm.PL
+++ b/dist/XSLoader/XSLoader_pm.PL
@@ -255,7 +255,7 @@ XSLoader - Dynamically load C libraries into Perl code
=head1 VERSION
-Version 0.17
+Version 0.22
=head1 SYNOPSIS
diff --git a/dist/XSLoader/t/XSLoader.t b/dist/XSLoader/t/XSLoader.t
index 1e86faa..d3538b8 100644
--- a/dist/XSLoader/t/XSLoader.t
+++ b/dist/XSLoader/t/XSLoader.t
@@ -130,7 +130,7 @@ SKIP: {
skip "File::Path not available", 1
unless eval { require File::Path };
my $name = "phooo$$";
- File::Path::make_path("$name/auto/Foo/Bar");
+ File::Path::mkpath("$name/auto/Foo/Bar");
open my $fh,
">$name/auto/Foo/Bar/Bar.$Config::Config{'dlext'}";
close $fh;
@@ -148,5 +148,5 @@ END
the_test:
ok $fell_back,
'XSLoader will not load relative paths based on (caller)[1]';
- File::Path::remove_tree($name);
+ File::Path::rmtree($name);
}
--
2.5.5
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