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authorEric Dumazet <edumazet@google.com>2023-09-12 12:17:24 +0300
committerPaolo Abeni <pabeni@redhat.com>2023-09-14 17:16:36 +0300
commite1dc0615c6b08ef36414f08c011965b8fb56198b (patch)
tree146013171a93e03ec8d322c189bd82fc615922ab
parentbcbc1b1de884647aa0318bf74eb7f293d72a1e40 (diff)
downloadlinux-e1dc0615c6b08ef36414f08c011965b8fb56198b.tar.xz
udp: move udp->gro_enabled to udp->udp_flags
syzbot reported that udp->gro_enabled can be read locklessly. Use one atomic bit from udp->udp_flags. Fixes: e20cf8d3f1f7 ("udp: implement GRO for plain UDP sockets.") Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
-rw-r--r--include/linux/udp.h2
-rw-r--r--net/ipv4/udp.c6
-rw-r--r--net/ipv4/udp_offload.c4
-rw-r--r--net/ipv6/udp.c2
4 files changed, 7 insertions, 7 deletions
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 8d4c3835b1b2..b344bd2e41fc 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -36,6 +36,7 @@ enum {
UDP_FLAGS_CORK, /* Cork is required */
UDP_FLAGS_NO_CHECK6_TX, /* Send zero UDP6 checksums on TX? */
UDP_FLAGS_NO_CHECK6_RX, /* Allow zero UDP6 checksums on RX? */
+ UDP_FLAGS_GRO_ENABLED, /* Request GRO aggregation */
};
struct udp_sock {
@@ -54,7 +55,6 @@ struct udp_sock {
* different encapsulation layer set
* this
*/
- gro_enabled:1, /* Request GRO aggregation */
accept_udp_l4:1,
accept_udp_fraglist:1;
/* indicator bits used by pcflag: */
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index cb32826a1db2..1debc10a0f02 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1868,7 +1868,7 @@ try_again:
(struct sockaddr *)sin);
}
- if (udp_sk(sk)->gro_enabled)
+ if (udp_test_bit(GRO_ENABLED, sk))
udp_cmsg_recv(msg, sk, skb);
if (inet_cmsg_flags(inet))
@@ -2713,7 +2713,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
/* when enabling GRO, accept the related GSO packet type */
if (valbool)
udp_tunnel_encap_enable(sk->sk_socket);
- up->gro_enabled = valbool;
+ udp_assign_bit(GRO_ENABLED, sk, valbool);
up->accept_udp_l4 = valbool;
release_sock(sk);
break;
@@ -2803,7 +2803,7 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
break;
case UDP_GRO:
- val = up->gro_enabled;
+ val = udp_test_bit(GRO_ENABLED, sk);
break;
/* The following two cannot be changed on UDP sockets, the return is
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 0f46b3c2e4ac..6c95d28d0c4a 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -557,10 +557,10 @@ struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
NAPI_GRO_CB(skb)->is_flist = 0;
if (!sk || !udp_sk(sk)->gro_receive) {
if (skb->dev->features & NETIF_F_GRO_FRAGLIST)
- NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled : 1;
+ NAPI_GRO_CB(skb)->is_flist = sk ? !udp_test_bit(GRO_ENABLED, sk) : 1;
if ((!sk && (skb->dev->features & NETIF_F_GRO_UDP_FWD)) ||
- (sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist)
+ (sk && udp_test_bit(GRO_ENABLED, sk)) || NAPI_GRO_CB(skb)->is_flist)
return call_gro_receive(udp_gro_receive_segment, head, skb);
/* no GRO, be sure flush the current packet */
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 6e1ea3029260..2c3281879b6d 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -413,7 +413,7 @@ try_again:
(struct sockaddr *)sin6);
}
- if (udp_sk(sk)->gro_enabled)
+ if (udp_test_bit(GRO_ENABLED, sk))
udp_cmsg_recv(msg, sk, skb);
if (np->rxopt.all)