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tcp: limit sk_rcvlowat by the maximum receive buffer

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The user-provided value to setsockopt(SO_RCVLOWAT) can be
larger than the maximum possible receive buffer. Such values
mute POLLIN signals on the socket which can stall progress
on the socket.

Limit the user-provided value to half of the maximum receive
buffer, i.e., half of sk_rcvbuf when the receive buffer size
is set by the user, or otherwise half of sysctl_tcp_rmem[2].

Fixes: d1361840f8 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Soheil Hassas Yeganeh 2018-06-08 22:47:10 -04:00 committed by David S. Miller
parent b718e8c8f4
commit 867f816bad
1 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
net/ipv4/tcp.c
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@ -1694,6 +1694,13 @@ EXPORT_SYMBOL(tcp_peek_len);
/* Make sure sk_rcvbuf is big enough to satisfy SO_RCVLOWAT hint */
int tcp_set_rcvlowat(struct sock *sk, int val)
{
int cap;
if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
cap = sk->sk_rcvbuf >> 1;
else
cap = sock_net(sk)->ipv4.sysctl_tcp_rmem[2] >> 1;
val = min(val, cap);
sk->sk_rcvlowat = val ? : 1;
/* Check if we need to signal EPOLLIN right now */
@ -1702,12 +1709,7 @@ int tcp_set_rcvlowat(struct sock *sk, int val)
if (sk->sk_userlocks & SOCK_RCVBUF_LOCK)
return 0;
/* val comes from user space and might be close to INT_MAX */
val <<= 1;
if (val < 0)
val = INT_MAX;
val = min(val, sock_net(sk)->ipv4.sysctl_tcp_rmem[2]);
if (val > sk->sk_rcvbuf) {
sk->sk_rcvbuf = val;
tcp_sk(sk)->window_clamp = tcp_win_from_space(sk, val);