The commit is pushed to "branch-rh7-3.10.0-327.18.2.vz7.14.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-327.18.2.vz7.14.21
------>
commit 508ffc3f26fe937c0197197e6d6b3f88b7450eb1
Author: Florian Westphal <[email protected]>
Date: Mon Jun 27 15:35:34 2016 +0400
ms/netfilter: x_tables: make sure e->next_offset covers remaining blob size
ML: 6e94e0cfb0887e4013b3b930fa6ab1fe6bb6ba91
Otherwise this function may read data beyond the ruleset blob.
Signed-off-by: Florian Westphal <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
Signed-off-by: Cyrill Gorcunov <[email protected]>
https://jira.sw.ru/browse/PSBM-49001
Reviewed-by: Vladimir Davydov <[email protected]>
---
net/ipv4/netfilter/arp_tables.c | 6 ++++--
net/ipv4/netfilter/ip_tables.c | 6 ++++--
net/ipv6/netfilter/ip6_tables.c | 6 ++++--
3 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 5e31404..3a83e07 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -591,7 +591,8 @@ static inline int check_entry_size_and_hooks(struct
arpt_entry *e,
unsigned int h;
if ((unsigned long)e % __alignof__(struct arpt_entry) != 0 ||
- (unsigned char *)e + sizeof(struct arpt_entry) >= limit) {
+ (unsigned char *)e + sizeof(struct arpt_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit) {
duprintf("Bad offset %p\n", e);
return -EINVAL;
}
@@ -1243,7 +1244,8 @@ check_compat_entry_size_and_hooks(struct
compat_arpt_entry *e,
duprintf("check_compat_entry_size_and_hooks %p\n", e);
if ((unsigned long)e % __alignof__(struct compat_arpt_entry) != 0 ||
- (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit) {
+ (unsigned char *)e + sizeof(struct compat_arpt_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit) {
duprintf("Bad offset %p, limit = %p\n", e, limit);
return -EINVAL;
}
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index fb736df..0542f5d 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -742,7 +742,8 @@ check_entry_size_and_hooks(struct ipt_entry *e,
unsigned int h;
if ((unsigned long)e % __alignof__(struct ipt_entry) != 0 ||
- (unsigned char *)e + sizeof(struct ipt_entry) >= limit) {
+ (unsigned char *)e + sizeof(struct ipt_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit) {
duprintf("Bad offset %p\n", e);
return -EINVAL;
}
@@ -1490,7 +1491,8 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry
*e,
duprintf("check_compat_entry_size_and_hooks %p\n", e);
if ((unsigned long)e % __alignof__(struct compat_ipt_entry) != 0 ||
- (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit) {
+ (unsigned char *)e + sizeof(struct compat_ipt_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit) {
duprintf("Bad offset %p, limit = %p\n", e, limit);
return -EINVAL;
}
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 1c8ed76..3b3ace0 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -751,7 +751,8 @@ check_entry_size_and_hooks(struct ip6t_entry *e,
unsigned int h;
if ((unsigned long)e % __alignof__(struct ip6t_entry) != 0 ||
- (unsigned char *)e + sizeof(struct ip6t_entry) >= limit) {
+ (unsigned char *)e + sizeof(struct ip6t_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit) {
duprintf("Bad offset %p\n", e);
return -EINVAL;
}
@@ -1499,7 +1500,8 @@ check_compat_entry_size_and_hooks(struct
compat_ip6t_entry *e,
duprintf("check_compat_entry_size_and_hooks %p\n", e);
if ((unsigned long)e % __alignof__(struct compat_ip6t_entry) != 0 ||
- (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit) {
+ (unsigned char *)e + sizeof(struct compat_ip6t_entry) >= limit ||
+ (unsigned char *)e + e->next_offset > limit) {
duprintf("Bad offset %p, limit = %p\n", e, limit);
return -EINVAL;
}
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