[src/trunk]: src/sys/kern Zero out 'cprng->cs_name' entirely. Otherwise the R...

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

details:   https://anonhg.NetBSD.org/src/rev/fd47806053f2
branches:  trunk
changeset: 1000152:fd47806053f2
user:      maxv <maxv%NetBSD.org@localhost>
date:      Wed Jul 10 17:32:37 2019 +0000

description:
Zero out 'cprng->cs_name' entirely. Otherwise the RND pool gets polluted
by uninitialized bits from the end of the string.

diffstat:

 sys/kern/subr_cprng.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 2ec276ad5a56 -r fd47806053f2 sys/kern/subr_cprng.c
--- a/sys/kern/subr_cprng.c     Wed Jul 10 16:35:11 2019 +0000
+++ b/sys/kern/subr_cprng.c     Wed Jul 10 17:32:37 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: subr_cprng.c,v 1.29 2017/12/01 19:05:49 christos Exp $ */
+/*     $NetBSD: subr_cprng.c,v 1.30 2019/07/10 17:32:37 maxv Exp $ */
 
 /*-
  * Copyright (c) 2011-2013 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_cprng.c,v 1.29 2017/12/01 19:05:49 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_cprng.c,v 1.30 2019/07/10 17:32:37 maxv Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -140,6 +140,7 @@
        KASSERT(ipl != IPL_SCHED && ipl != IPL_HIGH);
 
        /* Initialize the easy fields.  */
+       memset(cprng->cs_name, 0, sizeof(cprng->cs_name));
        (void)strlcpy(cprng->cs_name, name, sizeof(cprng->cs_name));
        cprng->cs_flags = flags;
        mutex_init(&cprng->cs_lock, MUTEX_DEFAULT, ipl);