[src/trunk]: src/sbin/rndctl Make "rndctl -L" overwrite the file with zeros, ...

[apb <apb%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/04f8eaa26f3d
branches:  trunk
changeset: 772078:04f8eaa26f3d
user:      apb <apb%NetBSD.org@localhost>
date:      Sat Dec 17 13:18:20 2011 +0000

description:
Make "rndctl -L" overwrite the file with zeros, not with the
same data that was just read from the file.

diffstat:

 sbin/rndctl/rndctl.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (37 lines):

diff -r 986bd5d85ce7 -r 04f8eaa26f3d sbin/rndctl/rndctl.c
--- a/sbin/rndctl/rndctl.c      Sat Dec 17 12:59:21 2011 +0000
+++ b/sbin/rndctl/rndctl.c      Sat Dec 17 13:18:20 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rndctl.c,v 1.22 2011/11/26 01:17:17 tls Exp $  */
+/*     $NetBSD: rndctl.c,v 1.23 2011/12/17 13:18:20 apb Exp $  */
 
 /*-
  * Copyright (c) 1997 Michael Graff.
@@ -33,7 +33,7 @@
 #include <sha1.h>
 
 #ifndef lint
-__RCSID("$NetBSD: rndctl.c,v 1.22 2011/11/26 01:17:17 tls Exp $");
+__RCSID("$NetBSD: rndctl.c,v 1.23 2011/12/17 13:18:20 apb Exp $");
 #endif
 
 
@@ -181,7 +181,7 @@
 do_load(const char *const filename)
 {
        int fd;
-       rndsave_t rs;
+       rndsave_t rs, rszero;
        rnddata_t rd;
        SHA1_CTX s;
        uint8_t digest[SHA1_DIGEST_LENGTH];
@@ -197,7 +197,8 @@
                err(1, "read");
        }
 
-       if (write(fd, &rs, sizeof(rs) != sizeof(rs))) {
+       memset(&rszero, 0, sizeof(rszero));
+       if (write(fd, &rszero, sizeof(rszero) != sizeof(rszero))) {
                err(1, "overwrite");
        }
        fsync_range(fd, FDATASYNC|FDISKSYNC, (off_t)0, (off_t)0);