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| author | Eric Dumazet <edumazet@google.com> | 2015-05-30 09:16:53 -0700 |
|---|---|---|
| committer | Ziyan <jaraidaniel@gmail.com> | 2016-01-05 18:20:38 +0100 |
| commit | 6c6baea5a8e9de8e542b98027d32e93abe744f36 (patch) | |
| tree | 1a92cb93946c3949c25f2bd2fb2987e595996f21 | |
| parent | 2cfb35e5936ef93b8bfc09a72042ccbd4df34743 (diff) | |
| download | kernel_samsung_tuna-6c6baea5a8e9de8e542b98027d32e93abe744f36.zip kernel_samsung_tuna-6c6baea5a8e9de8e542b98027d32e93abe744f36.tar.gz kernel_samsung_tuna-6c6baea5a8e9de8e542b98027d32e93abe744f36.tar.bz2 | |
udp: fix behavior of wrong checksums
We have two problems in UDP stack related to bogus checksums :
1) We return -EAGAIN to application even if receive queue is not empty.
This breaks applications using edge trigger epoll()
2) Under UDP flood, we can loop forever without yielding to other
processes, potentially hanging the host, especially on non SMP.
This patch is an attempt to make things better.
We might in the future add extra support for rt applications
wanting to better control time spent doing a recv() in a hostile
environment. For example we could validate checksums before queuing
packets in socket receive queue.
Change-Id: I9355321ac7ee564d56c342fa7738b918052bf308
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/udp.c | 6 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 6 |
2 files changed, 4 insertions, 8 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 966c3e1..24c7f52 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1249,10 +1249,8 @@ csum_copy_err: UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); unlock_sock_fast(sk, slow); - if (noblock) - return -EAGAIN; - - /* starting over for a new packet */ + /* starting over for a new packet, but check if we need to yield */ + cond_resched(); msg->msg_flags &= ~MSG_TRUNC; goto try_again; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 5c363cd..62a3701 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -453,10 +453,8 @@ csum_copy_err: } unlock_sock_fast(sk, slow); - if (noblock) - return -EAGAIN; - - /* starting over for a new packet */ + /* starting over for a new packet, but check if we need to yield */ + cond_resched(); msg->msg_flags &= ~MSG_TRUNC; goto try_again; } |