Module Name:src
Committed By: snj
Date: Sat Feb 10 04:25:34 UTC 2018
Modified Files:
src/sys/dist/pf/net [netbsd-6-0]: pf.c
Log Message:
Pull up following revision(s) (requested by maxv in ticket #1527):
sys/dist/pf/net/pf.c: revision 1.78 via patch
Oh, what is this. Fix a remotely-triggerable integer overflow: the way we
define TCPOLEN_SACK makes it unsigned, and the comparison in the while()
is unsigned too. That's not the expected behavior, the original code
wanted a signed comparison.
It's pretty easy to make 'hlen' go negative and trigger a buffer overflow.
This bug was reported 8 years ago by Lucio Albornoz in PR/44059.
To generate a diff of this commit:
cvs rdiff -u -r1.68 -r1.68.6.1 src/sys/dist/pf/net/pf.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dist/pf/net/pf.c
diff -u src/sys/dist/pf/net/pf.c:1.68 src/sys/dist/pf/net/pf.c:1.68.6.1
--- src/sys/dist/pf/net/pf.c:1.68 Mon Dec 19 16:10:07 2011
+++ src/sys/dist/pf/net/pf.c Sat Feb 10 04:25:34 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: pf.c,v 1.68 2011/12/19 16:10:07 drochner Exp $ */
+/* $NetBSD: pf.c,v 1.68.6.1 2018/02/10 04:25:34 snj Exp $ */
/* $OpenBSD: pf.c,v 1.552.2.1 2007/11/27 16:37:57 henning Exp $ */
/*
@@ -37,7 +37,7 @@
*/
#include
-__KERNEL_RCSID(0, "$NetBSD: pf.c,v 1.68 2011/12/19 16:10:07 drochner Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pf.c,v 1.68.6.1 2018/02/10 04:25:34 snj Exp $");
#include "pflog.h"
@@ -1590,7 +1590,7 @@ pf_modulate_sack(struct mbuf *m, int off
struct sackblk sack;
#ifdef __NetBSD__
-#define TCPOLEN_SACK (2 * sizeof(uint32_t))
+#define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */
#endif
#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
