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- (djm) [openbsd-compat/explicit_bzero.c] implement explicit_bzero()

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using memset_s() where possible; improve fallback to indirect bzero
   via a volatile pointer to give it more of a chance to avoid being
   optimised away.
This commit is contained in:
Damien Miller 2014-08-27 06:32:01 +10:00
parent 146218ac11
commit 3d673d103b
3 changed files with 31 additions and 6 deletions
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4
ChangeLog
View File

@ -8,6 +8,10 @@
on !ECC OpenSSL systems
- (djm) [monitor.c sshd.c] SIGXFSZ needs to be ignored in postauth
monitor, not preauth; bz#2263
- (djm) [openbsd-compat/explicit_bzero.c] implement explicit_bzero()
using memset_s() where possible; improve fallback to indirect bzero
via a volatile pointer to give it more of a chance to avoid being
optimised away.
20140825
- (djm) [bufec.c] Skip this file on !ECC OpenSSL

5
configure.ac
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@ -1,4 +1,4 @@
# $Id: configure.ac,v 1.582 2014/08/23 07:06:49 djm Exp $
# $Id: configure.ac,v 1.583 2014/08/26 20:32:01 djm Exp $
#
# Copyright (c) 1999-2004 Damien Miller
#
@ -15,7 +15,7 @@
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
AC_INIT([OpenSSH], [Portable], [openssh-unix-dev@mindrot.org])
AC_REVISION($Revision: 1.582 $)
AC_REVISION($Revision: 1.583 $)
AC_CONFIG_SRCDIR([ssh.c])
AC_LANG([C])
@ -1618,6 +1618,7 @@ AC_CHECK_FUNCS([ \
mblen \
md5_crypt \
memmove \
memset_s \
mkdtemp \
mmap \
ngetaddrinfo \

28
openbsd-compat/explicit_bzero.c
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@ -7,14 +7,34 @@
#include "includes.h"
#ifndef HAVE_EXPLICIT_BZERO
/*
* explicit_bzero - don't let the compiler optimize away bzero
*/
#ifndef HAVE_EXPLICIT_BZERO
#ifdef HAVE_MEMSET_S
void
explicit_bzero(void *p, size_t n)
{
bzero(p, n);
(void)memset_s(p, n, 0, n);
}
#endif
#else /* HAVE_MEMSET_S */
/*
* Indirect bzero through a volatile pointer to hopefully avoid
* dead-store optimisation eliminating the call.
*/
static void (* volatile ssh_bzero)(void *, size_t) = bzero;
void
explicit_bzero(void *p, size_t n)
{
ssh_bzero(p, n);
}
#endif /* HAVE_MEMSET_S */
#endif /* HAVE_EXPLICIT_BZERO */