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ipv4: annotate data races arount inet->min_ttl 

No report yet from KCSAN, yet worth documenting the races.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2021-10-25 09:48:23 -07:00 committed by Jakub Kicinski
parent 790eb67374
commit 14834c4f4e
2 changed files with 9 additions and 3 deletions
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5
net/ipv4/ip_sockglue.c
View File

@ -1352,7 +1352,10 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname,
goto e_inval; goto e_inval;
if (val < 0 || val > 255) if (val < 0 || val > 255)
goto e_inval; goto e_inval;
inet->min_ttl = val; /* tcp_v4_err() and tcp_v4_rcv() might read min_ttl
* while we are changint it.
*/
WRITE_ONCE(inet->min_ttl, val);
break; break;
default: default:

7
net/ipv4/tcp_ipv4.c
View File

@ -508,7 +508,8 @@ int tcp_v4_err(struct sk_buff *skb, u32 info)
if (sk->sk_state == TCP_CLOSE) if (sk->sk_state == TCP_CLOSE)
goto out; goto out;
if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { /* min_ttl can be changed concurrently from do_ip_setsockopt() */
if (unlikely(iph->ttl < READ_ONCE(inet_sk(sk)->min_ttl))) {
__NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
goto out; goto out;
} }
@ -2068,7 +2069,9 @@ process:
return 0; return 0;
} }
} }
if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) {
/* min_ttl can be changed concurrently from do_ip_setsockopt() */
if (unlikely(iph->ttl < READ_ONCE(inet_sk(sk)->min_ttl))) {
__NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
goto discard_and_relse; goto discard_and_relse;
} }