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From 3a629609084d147838368262171b923f0770e564 Mon Sep 17 00:00:00 2001
From: Tony Cook <tony@develop-help.com>
Date: Tue, 15 Dec 2015 10:56:54 +1100
Subject: ensure File::Spec::canonpath() preserves taint
Previously the unix specific XS implementation of canonpath() would
return an untainted path when supplied a tainted path.
For the empty string case, newSVpvs() already sets taint as needed on
its result.
This issue was assigned CVE-2015-8607.
Bug: https://rt.perl.org/Ticket/Display.html?id=126862
Bug-Debian: https://bugs.debian.org/810719
Origin: upstream
Patch-Name: fixes/CVE-2015-8607_file_spec_taint_fix.diff
---
dist/PathTools/Cwd.xs | 1 +
dist/PathTools/t/taint.t | 19 ++++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/dist/PathTools/Cwd.xs b/dist/PathTools/Cwd.xs
index 9d4dcf0..3d018dc 100644
--- a/dist/PathTools/Cwd.xs
+++ b/dist/PathTools/Cwd.xs
@@ -535,6 +535,7 @@ THX_unix_canonpath(pTHX_ SV *path)
*o = 0;
SvPOK_on(retval);
SvCUR_set(retval, o - SvPVX(retval));
+ SvTAINT(retval);
return retval;
}
diff --git a/dist/PathTools/t/taint.t b/dist/PathTools/t/taint.t
index 309b3e5..48f8c5b 100644
--- a/dist/PathTools/t/taint.t
+++ b/dist/PathTools/t/taint.t
@@ -12,7 +12,7 @@ use Test::More;
BEGIN {
plan(
${^TAINT}
- ? (tests => 17)
+ ? (tests => 21)
: (skip_all => "A perl without taint support")
);
}
@@ -34,3 +34,20 @@ foreach my $func (@Functions) {
# Previous versions of Cwd tainted $^O
is !tainted($^O), 1, "\$^O should not be tainted";
+
+{
+ # [perl #126862] canonpath() loses taint
+ my $tainted = substr($ENV{PATH}, 0, 0);
+ # yes, getcwd()'s result should be tainted, and is tested above
+ # but be sure
+ ok tainted(File::Spec->canonpath($tainted . Cwd::getcwd)),
+ "canonpath() keeps taint on non-empty string";
+ ok tainted(File::Spec->canonpath($tainted)),
+ "canonpath() keeps taint on empty string";
+
+ (Cwd::getcwd() =~ /^(.*)/);
+ my $untainted = $1;
+ ok !tainted($untainted), "make sure our untainted value is untainted";
+ ok !tainted(File::Spec->canonpath($untainted)),
+ "canonpath() doesn't add taint to untainted string";
+}
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