oping: Disable the “-f” option when real and effective user IDs don't match.

[liboping.git] / src / mans / oping.pod

diff --git a/src/mans/oping.pod b/src/mans/oping.pod
index 8a3cb58cc1cdb15783bcdfac69c36f5e7b75c64b..fc8911dcab4adaebce02f47fcc8480f6a94ec773 100644 (file)
--- a/src/mans/oping.pod
+++ b/src/mans/oping.pod
@@ -58,6 +58,10 @@ Set the outgoing network device to use.
 Instead of specifying hostnames on the command line, read them from
 I<filename>. If I<filename> is B<->, read from C<STDIN>.
 
+This option is only available if the real user ID (as returned by L<getuid(2)>)
+and the effective user ID (as returned by L<geteuid(2)>) match. This is meant
+to avoid security issues when I<oping> is installed with the SUID-bit.
+
 =back
 
 =head1 SEE ALSO