X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperlsec.pod;h=2e1fda370406866fc5c51fe782c0f893d2804024;hb=97828cef4d4cd22b548b8ec430d2e0e28ea8ae8c;hp=8616c642d30850b3869f44d08a11303a3cf4d974;hpb=7f6513c1071003ae5bc4d38d5816fd7d293c6346;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perlsec.pod b/pod/perlsec.pod
index 8616c64..2e1fda3 100644
--- a/pod/perlsec.pod
+++ b/pod/perlsec.pod
@@ -44,14 +44,6 @@ directories, or processes, B<with the following exceptions>:
 
 =item *
 
-If you pass more than one argument to either C<system> or C<exec>,
-the arguments are checked for taintedness B<but> the operation will still
-be attempted, emitting an optional warning.  This will be fatal in a 
-future version of perl so do not rely on it to bypass the tainting 
-mechanism.
-
-=item *
-
 Arguments to C<print> and C<syswrite> are B<not> checked for taintedness.
 
 =item *
@@ -92,7 +84,7 @@ For example:
     $data = 'abc';		# Not tainted
 
     system "echo $arg";		# Insecure
-    system "/bin/echo", $arg;	# Allowed but considered insecure
+    system "/bin/echo", $arg;	# Considered insecure
 				# (Perl doesn't know about /bin/echo)
     system "echo $hid";		# Insecure
     system "echo $data";	# Insecure until PATH set
@@ -110,7 +102,7 @@ For example:
 
     open(FOO,"echo $arg|");	# Not OK
     open(FOO,"-|")
-	or exec 'echo', $arg;	# Allowed but not really OK
+	or exec 'echo', $arg;	# Also not OK
 
     $shout = `echo $arg`;	# Insecure, $shout now tainted
 
@@ -118,8 +110,8 @@ For example:
     umask $arg;			# Insecure
 
     exec "echo $arg";		# Insecure
-    exec "echo", $arg;		# Allowed but considered insecure
-    exec "sh", '-c', $arg;	# Considered secure, alas!
+    exec "echo", $arg;		# Insecure
+    exec "sh", '-c', $arg;	# Very insecure!
 
     @files = <*.c>;		# insecure (uses readdir() or similar)
     @files = glob('*.c');	# insecure (uses readdir() or similar)
@@ -133,10 +125,7 @@ For example:
     $arg, `true`;		# Insecure (although it isn't really)
 
 If you try to do something insecure, you will get a fatal error saying
-something like "Insecure dependency" or "Insecure $ENV{PATH}".  Note that you
-can still write an insecure B<system> or B<exec>, but only by explicitly
-doing something like the "considered secure" example above.  This will not
-be possible in a future version of Perl.
+something like "Insecure dependency" or "Insecure $ENV{PATH}".
 
 =head2 Laundering and Detecting Tainted Data
 
@@ -390,6 +379,13 @@ Your access to it does not give you permission to use it blah blah
 blah."  You should see a lawyer to be sure your licence's wording will
 stand up in court.
 
+=head2 Unicode
+
+Unicode is a new and complex technology and one may easily overlook
+certain security pitfalls.  See L<perluniintro> for an overview and
+L<perlunicode> for details, and L<perlunicode/"Security Implications
+of Unicode"> for security implications in particular.
+
 =head1 SEE ALSO
 
 L<perlrun> for its description of cleaning up environment variables.