[NETFILTER]: Fix possible overflow in netfilters do_replace()

netfilter's do_replace() can overflow on addition within SMP_ALIGN()
and/or on multiplication by NR_CPUS, resulting in a buffer overflow on
the copy_from_user().  In practice, the overflow on addition is
triggerable on all systems, whereas the multiplication one might require
much physical memory to be present due to the check above.  Either is
sufficient to overwrite arbitrary amounts of kernel memory.

I really hate adding the same check to all 4 versions of do_replace(),
but the code is duplicate...

Found by Solar Designer during security audit of OpenVZ.org
Signed-Off-By: NKirill Korotaev <dev@openvz.org>
Signed-Off-By: NSolar Designer <solar@openwall.com>
Signed-off-by: NPatrck McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/netfilter/ebtables.c

@@ -934,6 +934,13 @@ static int do_replace(void __user *user, unsigned int len)
 		BUGPRINT("Entries_size never zero\n");
 		return -EINVAL;
 	}
+	/* overflow check */
+	if (tmp.nentries >= ((INT_MAX - sizeof(struct ebt_table_info)) / NR_CPUS -
+			SMP_CACHE_BYTES) / sizeof(struct ebt_counter))
+		return -ENOMEM;
+	if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
+		return -ENOMEM;
+
 	countersize = COUNTER_OFFSET(tmp.nentries) * 
 					(highest_possible_processor_id()+1);
 	newinfo = (struct ebt_table_info *)

net/ipv4/netfilter/arp_tables.c

@@ -807,6 +807,13 @@ static int do_replace(void __user *user, unsigned int len)
 	if (len != sizeof(tmp) + tmp.size)
 		return -ENOPROTOOPT;
 
+	/* overflow check */
+	if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS -
+			SMP_CACHE_BYTES)
+		return -ENOMEM;
+	if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+		return -ENOMEM;
+
 	newinfo = xt_alloc_table_info(tmp.size);
 	if (!newinfo)
 		return -ENOMEM;

net/ipv4/netfilter/ip_tables.c

@@ -921,6 +921,13 @@ do_replace(void __user *user, unsigned int len)
 	if (len != sizeof(tmp) + tmp.size)
 		return -ENOPROTOOPT;
 
+	/* overflow check */
+	if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS -
+			SMP_CACHE_BYTES)
+		return -ENOMEM;
+	if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+		return -ENOMEM;
+
 	newinfo = xt_alloc_table_info(tmp.size);
 	if (!newinfo)
 		return -ENOMEM;

net/ipv6/netfilter/ip6_tables.c

@@ -978,6 +978,13 @@ do_replace(void __user *user, unsigned int len)
 	if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
 		return -EFAULT;
 
+	/* overflow check */
+	if (tmp.size >= (INT_MAX - sizeof(struct xt_table_info)) / NR_CPUS -
+			SMP_CACHE_BYTES)
+		return -ENOMEM;
+	if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
+		return -ENOMEM;
+
 	newinfo = xt_alloc_table_info(tmp.size);
 	if (!newinfo)
 		return -ENOMEM;