net/packet: annotate accesses to po->bind

tpacket_snd(), packet_snd(), packet_getname() and packet_seq_show()
can read po->num without holding a lock. This means other threads
can change po->num at the same time.

KCSAN complained about this known fact [1]
Add READ_ONCE()/WRITE_ONCE() to address the issue.

[1] BUG: KCSAN: data-race in packet_do_bind / packet_sendmsg

write to 0xffff888131a0dcc0 of 2 bytes by task 24714 on cpu 0:
 packet_do_bind+0x3ab/0x7e0 net/packet/af_packet.c:3181
 packet_bind+0xc3/0xd0 net/packet/af_packet.c:3255
 __sys_bind+0x200/0x290 net/socket.c:1637
 __do_sys_bind net/socket.c:1648 [inline]
 __se_sys_bind net/socket.c:1646 [inline]
 __x64_sys_bind+0x3d/0x50 net/socket.c:1646
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888131a0dcc0 of 2 bytes by task 24719 on cpu 1:
 packet_snd net/packet/af_packet.c:2899 [inline]
 packet_sendmsg+0x317/0x3570 net/packet/af_packet.c:3040
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2433
 __do_sys_sendmsg net/socket.c:2442 [inline]
 __se_sys_sendmsg net/socket.c:2440 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2440
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000 -> 0x1200

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24719 Comm: syz-executor.5 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.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 74e6e45..e91a36b 100644 (file)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2683,7 +2683,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
        }
        if (likely(saddr == NULL)) {
                dev     = packet_cached_dev_get(po);
-               proto   = po->num;
+               proto   = READ_ONCE(po->num);
        } else {
                err = -EINVAL;
                if (msg->msg_namelen < sizeof(struct sockaddr_ll))
@@ -2896,7 +2896,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
 
        if (likely(saddr == NULL)) {
                dev     = packet_cached_dev_get(po);
-               proto   = po->num;
+               proto   = READ_ONCE(po->num);
        } else {
                err = -EINVAL;
                if (msg->msg_namelen < sizeof(struct sockaddr_ll))
@@ -3171,7 +3171,7 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
                        /* prevents packet_notifier() from calling
                         * register_prot_hook()
                         */
-                       po->num = 0;
+                       WRITE_ONCE(po->num, 0);
                        __unregister_prot_hook(sk, true);
                        rcu_read_lock();
                        dev_curr = po->prot_hook.dev;
@@ -3181,7 +3181,7 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
                }
 
                BUG_ON(po->running);
-               po->num = proto;
+               WRITE_ONCE(po->num, proto);
                po->prot_hook.type = proto;
 
                if (unlikely(unlisted)) {
@@ -3526,7 +3526,7 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
 
        sll->sll_family = AF_PACKET;
        sll->sll_ifindex = po->ifindex;
-       sll->sll_protocol = po->num;
+       sll->sll_protocol = READ_ONCE(po->num);
        sll->sll_pkttype = 0;
        rcu_read_lock();
        dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
@@ -4414,7 +4414,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
        was_running = po->running;
        num = po->num;
        if (was_running) {
-               po->num = 0;
+               WRITE_ONCE(po->num, 0);
                __unregister_prot_hook(sk, false);
        }
        spin_unlock(&po->bind_lock);
@@ -4449,7 +4449,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
 
        spin_lock(&po->bind_lock);
        if (was_running) {
-               po->num = num;
+               WRITE_ONCE(po->num, num);
                register_prot_hook(sk);
        }
        spin_unlock(&po->bind_lock);
@@ -4619,7 +4619,7 @@ static int packet_seq_show(struct seq_file *seq, void *v)
                           s,
                           refcount_read(&s->sk_refcnt),
                           s->sk_type,
-                          ntohs(po->num),
+                          ntohs(READ_ONCE(po->num)),
                           po->ifindex,
                           po->running,
                           atomic_read(&s->sk_rmem_alloc),