netfilter: x_tables: fix unconditional helper

Orabug: 24690280
CVE: CVE-2016-3134

[ Upstream commit 54d83fc74aa9ec72794373cb47432c5f7fb1a309 ]

Ben Hawkes says:

 In the mark_source_chains function (net/ipv4/netfilter/ip_tables.c) it
 is possible for a user-supplied ipt_entry structure to have a large
 next_offset field. This field is not bounds checked prior to writing a
 counter value at the supplied offset.

Problem is that mark_source_chains should not have been called --
the rule doesn't have a next entry, so its supposed to return
an absolute verdict of either ACCEPT or DROP.

However, the function conditional() doesn't work as the name implies.
It only checks that the rule is using wildcard address matching.

However, an unconditional rule must also not be using any matches
(no -m args).

The underflow validator only checked the addresses, therefore
passing the 'unconditional absolute verdict' test, while
mark_source_chains also tested for presence of matches, and thus
proceeeded to the next (not-existent) rule.

Unify this so that all the callers have same idea of 'unconditional rule'.

Reported-by: Ben Hawkes <hawkes@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 850c377e0e2d76723884d610ff40827d26aa21eb)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	net/ipv4/netfilter/arp_tables.c

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 538839daf110d2f0b290ef0b4c12344e485caa84..82ceed05f202d4a9240d46d971e2b5f4c0b3498f 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -362,18 +362,6 @@ static inline bool unconditional(const struct arpt_entry *e)
               memcmp(&e->arp, &uncond, sizeof(uncond)) == 0;
 }
 
-static bool find_jump_target(const struct xt_table_info *t,
-                            const struct arpt_entry *target)
-{
-       struct arpt_entry *iter;
-
-       xt_entry_foreach(iter, t->entries, t->size) {
-                if (iter == target)
-                       return true;
-       }
-       return false;
-}
-
 /* Figures out from what hook each rule can be called: returns 0 if
  * there are loops.  Puts hook bitmask in comefrom.
  */