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authordrochner <drochner@NetBSD.org>2011-11-29 13:18:52 +0000
committerdrochner <drochner@NetBSD.org>2011-11-29 13:18:52 +0000
commit0a939522eac305c8ea3fb31e4d81a6f903cd1614 (patch)
treeee2c267b3a7a65ad864abf7ddf2c0f920e7e9264 /lib/libcrypt
parent280502151afd697b8ac14130d79d1a2b64f12474 (diff)
zero out hash context after use, to avoid traces in RAM
(hint from "Solar Designer")
Diffstat (limited to 'lib/libcrypt')
-rw-r--r--lib/libcrypt/md5crypt.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/libcrypt/md5crypt.c b/lib/libcrypt/md5crypt.c
index 4b04da11da5..d85180cc631 100644
--- a/lib/libcrypt/md5crypt.c
+++ b/lib/libcrypt/md5crypt.c
@@ -1,4 +1,4 @@
-/* $NetBSD: md5crypt.c,v 1.9 2007/01/17 23:24:22 hubertf Exp $ */
+/* $NetBSD: md5crypt.c,v 1.10 2011/11/29 13:18:52 drochner Exp $ */
/*
* ----------------------------------------------------------------------------
@@ -15,7 +15,7 @@
#include <sys/cdefs.h>
#if !defined(lint)
-__RCSID("$NetBSD: md5crypt.c,v 1.9 2007/01/17 23:24:22 hubertf Exp $");
+__RCSID("$NetBSD: md5crypt.c,v 1.10 2011/11/29 13:18:52 drochner Exp $");
#endif /* not lint */
/*
@@ -117,6 +117,9 @@ __md5crypt(const char *pw, const char *salt)
FINAL(final, &ctx);
+ /* Don't leave anything around in vm they could use. */
+ memset(&ctx, 0, sizeof(ctx));
+
/*
* And now, just to make sure things don't run too fast. On a 60 MHz
* Pentium this takes 34 msec, so you would need 30 seconds to build
@@ -144,6 +147,9 @@ __md5crypt(const char *pw, const char *salt)
FINAL(final, &ctx1);
}
+ /* Don't leave anything around in vm they could use. */
+ memset(&ctx1, 0, sizeof(ctx1));
+
p = passwd + sl + MD5_MAGIC_LEN + 1;
l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; __crypt_to64(p,l,4); p += 4;