Revert "mg.c, Cwd.pm - Empty path is the same as "." which is forbidden under taint"

This reverts commit 5ede4453c4877110eb5214ff400c173210b101b1.

I messed up and pushed it to blead not to the PR branch I meant to push
it. Thanks to xenu for noticing. This needs a smoke before it should be
applied.

2 files changed, 3 insertions, 21 deletions

diff --git a/t/op/taint.t b/t/op/taint.t
index 49342f208d..c1ca6d345c 100644
--- a/t/op/taint.t
+++ b/t/op/taint.t
@@ -18,7 +18,7 @@ use strict;
 use warnings;
 use Config;
 
-plan tests => 1061;
+plan tests => 1054;
 
 $| = 1;
 
@@ -138,17 +138,14 @@ my $TEST = 'TEST';
 {
     $ENV{'DCL$PATH'} = '' if $Is_VMS;
 
-    # Empty path is the same as "." on *nix, so we have to set it
-    # to something or we will fail taint tests. perhaps setting it
-    # to "/" would be better. Anything absolute will do.
-    $ENV{PATH} = '/usr/bin';
+    $ENV{PATH} = ($Is_Cygwin) ? '/usr/bin' : '';
     delete @ENV{@MoreEnv};
     $ENV{TERM} = 'dumb';
 
     is(eval { `$echo 1` }, "1\n");
 
     SKIP: {
-        skip "Environment tainting tests skipped", 11
+        skip "Environment tainting tests skipped", 4
           if $Is_MSWin32 || $Is_VMS;
 
 	my @vars = ('PATH', @MoreEnv);
@@ -160,16 +157,6 @@ my $TEST = 'TEST';
 	}
 	is("@vars", "");
 
-        # make sure that the empty path or empty path components
-        # trigger an "Insecure directory in $ENV{PATH}" error.
-        for my $path ("", ".", "/:", ":/", "/::/", ".:/", "/:.") {
-            local $ENV{PATH} = $path;
-            eval {`$echo 1`};
-            ok($@ =~ /Insecure directory in \$ENV\{PATH\}/,
-                "path '$path' is insecure as expected")
-                or diag "$@";
-        }
-
 	# tainted $TERM is unsafe only if it contains metachars
 	local $ENV{TERM};
 	$ENV{TERM} = 'e=mc2';
diff --git a/t/test.pl b/t/test.pl
index 5062ece575..d92f28f8f2 100644
--- a/t/test.pl
+++ b/t/test.pl
@@ -776,11 +776,6 @@ sub untaint_path {
             $path = $path . $sep;
         }
         $path = $path . '/bin';
-    } elsif (!$is_vms and !length $path) {
-        # empty PATH is the same as a path of "." on *nix so to prevent
-        # tests from dieing under taint we need to return something
-        # absolute. Perhaps "/" would be better? Anything absolute will do.
-        $path = "/usr/bin";
     }
 
     $path;