Add pledge support to cmp(1).

This is a simple case of using "stdio rpath" until all files are opened and
then dropping down to "stdio" since it includes "rw" on open fds.

ok deraadt@

diff --git a/usr.bin/cmp/cmp.c b/usr.bin/cmp/cmp.c
index 80c9a1d..0b5c863 100644 (file)
--- a/usr.bin/cmp/cmp.c
+++ b/usr.bin/cmp/cmp.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: cmp.c,v 1.12 2009/10/27 23:59:36 deraadt Exp $      */
+/*      $OpenBSD: cmp.c,v 1.13 2015/10/10 05:35:22 doug Exp $      */
 /*      $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $      */
 
 /*
@@ -57,6 +57,9 @@ main(int argc, char *argv[])
 
        setlocale(LC_ALL, "");
 
+       if (pledge("stdio rpath", NULL) == -1)
+               err(1, "pledge");
+
        while ((ch = getopt(argc, argv, "ls")) != -1)
                switch (ch) {
                case 'l':               /* print all differences */
@@ -109,6 +112,9 @@ main(int argc, char *argv[])
                        err(ERR_EXIT, "%s", file2);
        }
 
+       if (pledge("stdio", NULL) == -1)
+               err(1, "pledge");
+
        skip1 = argc > 2 ? strtoq(argv[2], NULL, 0) : 0;
        skip2 = argc == 4 ? strtoq(argv[3], NULL, 0) : 0;