only modifies data, stdin to stdout, so tame "stdout"

diff --git a/usr.bin/tr/tr.c b/usr.bin/tr/tr.c
index c74fb1c..767660d 100644 (file)
--- a/usr.bin/tr/tr.c
+++ b/usr.bin/tr/tr.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: tr.c,v 1.17 2014/06/03 20:57:23 millert Exp $ */
+/*     $OpenBSD: tr.c,v 1.18 2015/10/06 13:49:33 deraadt Exp $ */
 /*     $NetBSD: tr.c,v 1.5 1995/08/31 22:13:48 jtc Exp $       */
 
 /*
@@ -87,6 +87,9 @@ main(int argc, char *argv[])
        int ch, cnt, lastch, *p;
        int cflag, dflag, sflag, isstring2;
 
+       if (tame("stdio", NULL) == -1)
+               err(1, "tame");
+
        cflag = dflag = sflag = 0;
        while ((ch = getopt(argc, argv, "Ccds")) != -1)
                switch(ch) {