packet: fix crash in fanout_demux_rollover()

syzkaller found a race condition fanout_demux_rollover() while removing
a packet socket from a fanout group.

po->rollover is read and operated on during packet_rcv_fanout(), via
fanout_demux_rollover(), but the pointer is currently cleared before the
synchronization in packet_release().   It is safer to delay the cleanup
until after synchronize_net() has been called, ensuring all calls to
packet_rcv_fanout() for this socket have finished.

To further simplify synchronization around the rollover structure, set
po->rollover in fanout_add() only if there are no errors.  This removes
the need for rcu in the struct and in the call to
packet_getsockopt(..., PACKET_ROLLOVER_STATS, ...).

Crashing stack trace:
 fanout_demux_rollover+0xb6/0x4d0 net/packet/af_packet.c:1392
 packet_rcv_fanout+0x649/0x7c8 net/packet/af_packet.c:1487
 dev_queue_xmit_nit+0x835/0xc10 net/core/dev.c:1953
 xmit_one net/core/dev.c:2975 [inline]
 dev_hard_start_xmit+0x16b/0xac0 net/core/dev.c:2995
 __dev_queue_xmit+0x17a4/0x2050 net/core/dev.c:3476
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3509
 neigh_connected_output+0x489/0x720 net/core/neighbour.c:1379
 neigh_output include/net/neighbour.h:482 [inline]
 ip6_finish_output2+0xad1/0x22a0 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1f4/0x850 net/ipv6/ip6_output.c:163
 dst_output include/net/dst.h:459 [inline]
 NF_HOOK.constprop.35+0xff/0x630 include/linux/netfilter.h:250
 mld_sendpack+0x6a8/0xcc0 net/ipv6/mcast.c:1660
 mld_send_initial_cr.part.24+0x103/0x150 net/ipv6/mcast.c:2072
 mld_send_initial_cr net/ipv6/mcast.c:2056 [inline]
 ipv6_mc_dad_complete+0x99/0x130 net/ipv6/mcast.c:2079
 addrconf_dad_completed+0x595/0x970 net/ipv6/addrconf.c:4039
 addrconf_dad_work+0xac9/0x1160 net/ipv6/addrconf.c:3971
 process_one_work+0xbf0/0x1bc0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x35e/0x430 kernel/kthread.c:231
 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:432

Fixes: 0648ab70afe6 ("packet: rollover prepare: per-socket state")
Fixes: 509c7a1ecc860 ("packet: avoid panic in packet_getsockopt()")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Mike Maloney <maloney@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 737092ca9b4eed464b6c0907d85b679ae4da6046..1b7bb9d9865e24775a098a697cf7d07fb9d85342 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1687,7 +1687,6 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
                atomic_long_set(&rollover->num, 0);
                atomic_long_set(&rollover->num_huge, 0);
                atomic_long_set(&rollover->num_failed, 0);
-               po->rollover = rollover;
        }
 
        if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
@@ -1745,6 +1744,8 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
                if (refcount_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
                        __dev_remove_pack(&po->prot_hook);
                        po->fanout = match;
+                       po->rollover = rollover;
+                       rollover = NULL;
                        refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1);
                        __fanout_link(sk, po);
                        err = 0;
@@ -1758,10 +1759,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
        }
 
 out:
-       if (err && rollover) {
-               kfree_rcu(rollover, rcu);
-               po->rollover = NULL;
-       }
+       kfree(rollover);
        mutex_unlock(&fanout_mutex);
        return err;
 }
@@ -1785,11 +1783,6 @@ static struct packet_fanout *fanout_release(struct sock *sk)
                        list_del(&f->list);
                else
                        f = NULL;
-
-               if (po->rollover) {
-                       kfree_rcu(po->rollover, rcu);
-                       po->rollover = NULL;
-               }
        }
        mutex_unlock(&fanout_mutex);
 
@@ -3029,6 +3022,7 @@ static int packet_release(struct socket *sock)
        synchronize_net();
 
        if (f) {
+               kfree(po->rollover);
                fanout_release_data(f);
                kfree(f);
        }
@@ -3843,7 +3837,6 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
        void *data = &val;
        union tpacket_stats_u st;
        struct tpacket_rollover_stats rstats;
-       struct packet_rollover *rollover;
 
        if (level != SOL_PACKET)
                return -ENOPROTOOPT;
@@ -3922,18 +3915,13 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
                       0);
                break;
        case PACKET_ROLLOVER_STATS:
-               rcu_read_lock();
-               rollover = rcu_dereference(po->rollover);
-               if (rollover) {
-                       rstats.tp_all = atomic_long_read(&rollover->num);
-                       rstats.tp_huge = atomic_long_read(&rollover->num_huge);
-                       rstats.tp_failed = atomic_long_read(&rollover->num_failed);
-                       data = &rstats;
-                       lv = sizeof(rstats);
-               }
-               rcu_read_unlock();
-               if (!rollover)
+               if (!po->rollover)
                        return -EINVAL;
+               rstats.tp_all = atomic_long_read(&po->rollover->num);
+               rstats.tp_huge = atomic_long_read(&po->rollover->num_huge);
+               rstats.tp_failed = atomic_long_read(&po->rollover->num_failed);
+               data = &rstats;
+               lv = sizeof(rstats);
                break;
        case PACKET_TX_HAS_OFF:
                val = po->tp_tx_has_off;

diff --git a/net/packet/internal.h b/net/packet/internal.h
index 562fbc155006374862e5bfdd78b65a7f46210bea..a1d2b2319ae990d55bb3c469cc1ba404cadcbdb9 100644 (file)
--- a/net/packet/internal.h
+++ b/net/packet/internal.h
@@ -95,7 +95,6 @@ struct packet_fanout {
 
 struct packet_rollover {
        int                     sock;
-       struct rcu_head         rcu;
        atomic_long_t           num;
        atomic_long_t           num_huge;
        atomic_long_t           num_failed;