linamh/sys-kernel/win4lin-sources/files/win4lin-sources-2.6.CAN-2004-0816.patch
2022-11-19 21:49:12 +01:00

44 lines
1.7 KiB
Diff

Subject: Prevent ICMP crash in netfilter logging
From: Olaf Kirch <okir@suse.de>
References: 46016
This patch fixes a remotely triggerable crash in the netfilter code
when looking at ICMP unreachables. It dies when trying to copy
BIGNUM bytes...
Index: linux-2.6.5/net/ipv4/netfilter/ipt_LOG.c
===================================================================
--- linux-2.6.5.orig/net/ipv4/netfilter/ipt_LOG.c 2004-02-19 11:36:37.000000000 +0100
+++ linux-2.6.5/net/ipv4/netfilter/ipt_LOG.c 2004-09-24 15:48:54.000000000 +0200
@@ -71,7 +71,7 @@
printk("FRAG:%u ", ntohs(iph.frag_off) & IP_OFFSET);
if ((info->logflags & IPT_LOG_IPOPT)
- && iph.ihl * 4 != sizeof(struct iphdr)) {
+ && iph.ihl * 4 > sizeof(struct iphdr)) {
unsigned char opt[4 * 15 - sizeof(struct iphdr)];
unsigned int i, optsize;
@@ -138,7 +138,7 @@
printk("URGP=%u ", ntohs(tcph.urg_ptr));
if ((info->logflags & IPT_LOG_TCPOPT)
- && tcph.doff * 4 != sizeof(struct tcphdr)) {
+ && tcph.doff * 4 > sizeof(struct tcphdr)) {
unsigned char opt[4 * 15 - sizeof(struct tcphdr)];
unsigned int i, optsize;
Index: linux-2.6.5/net/ipv6/netfilter/ip6t_LOG.c
===================================================================
--- linux-2.6.5.orig/net/ipv6/netfilter/ip6t_LOG.c 2004-09-24 15:47:00.000000000 +0200
+++ linux-2.6.5/net/ipv6/netfilter/ip6t_LOG.c 2004-09-24 15:48:35.000000000 +0200
@@ -188,7 +188,7 @@
printk("URGP=%u ", ntohs(tcph->urg_ptr));
if ((info->logflags & IP6T_LOG_TCPOPT)
- && tcph->doff * 4 != sizeof(struct tcphdr)) {
+ && tcph->doff * 4 > sizeof(struct tcphdr)) {
unsigned int i;
/* Max length: 127 "OPT (" 15*4*2chars ") " */