netfilter: nfnetlink: fix insufficient validation in nfnetlink_bind

Make sure the netlink group exists, otherwise you can trigger an out
of bound array memory access from the netlink_bind() path. This splat
can only be triggered only by superuser.

[  180.203600] UBSan: Undefined behaviour in ../net/netfilter/nfnetlink.c:467:28
[  180.204249] index 9 is out of range for type 'int [9]'
[  180.204697] CPU: 0 PID: 1771 Comm: trinity-main Not tainted 3.18.0-rc4-mm1+ #122
[  180.205365] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org
+04/01/2014
[  180.206498]  0000000000000018 0000000000000000 0000000000000009 ffff88007bdf7da8
[  180.207220]  ffffffff82b0ef5f 0000000000000092 ffffffff845ae2e0 ffff88007bdf7db8
[  180.207887]  ffffffff8199e489 ffff88007bdf7e18 ffffffff8199ea22 0000003900000000
[  180.208639] Call Trace:
[  180.208857] dump_stack (lib/dump_stack.c:52)
[  180.209370] ubsan_epilogue (lib/ubsan.c:174)
[  180.209849] __ubsan_handle_out_of_bounds (lib/ubsan.c:400)
[  180.210512] nfnetlink_bind (net/netfilter/nfnetlink.c:467)
[  180.210986] netlink_bind (net/netlink/af_netlink.c:1483)
[  180.211495] SYSC_bind (net/socket.c:1541)

Moreover, define the missing nf_tables and nf_acct multicast groups too.

Reported-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 6c5a915..13c2e17 100644 (file)
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -47,6 +47,8 @@ static const int nfnl_group2type[NFNLGRP_MAX+1] = {
        [NFNLGRP_CONNTRACK_EXP_NEW]     = NFNL_SUBSYS_CTNETLINK_EXP,
        [NFNLGRP_CONNTRACK_EXP_UPDATE]  = NFNL_SUBSYS_CTNETLINK_EXP,
        [NFNLGRP_CONNTRACK_EXP_DESTROY] = NFNL_SUBSYS_CTNETLINK_EXP,
+       [NFNLGRP_NFTABLES]              = NFNL_SUBSYS_NFTABLES,
+       [NFNLGRP_ACCT_QUOTA]            = NFNL_SUBSYS_ACCT,
 };
 
 void nfnl_lock(__u8 subsys_id)
@@ -464,7 +466,12 @@ static void nfnetlink_rcv(struct sk_buff *skb)
 static int nfnetlink_bind(int group)
 {
        const struct nfnetlink_subsystem *ss;
-       int type = nfnl_group2type[group];
+       int type;
+
+       if (group <= NFNLGRP_NONE || group > NFNLGRP_MAX)
+               return -EINVAL;
+
+       type = nfnl_group2type[group];
 
        rcu_read_lock();
        ss = nfnetlink_get_subsys(type);
@@ -514,6 +521,9 @@ static int __init nfnetlink_init(void)
 {
        int i;
 
+       for (i = NFNLGRP_NONE + 1; i <= NFNLGRP_MAX; i++)
+               BUG_ON(nfnl_group2type[i] == NFNL_SUBSYS_NONE);
+
        for (i=0; i<NFNL_SUBSYS_COUNT; i++)
                mutex_init(&table[i].mutex);