diff options
| author | Vincent Whitchurch <vincent.whitchurch@axis.com> | 2018-09-06 16:54:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 09:37:58 +0300 |
| commit | effa7afc5283ecbbdbb4af86eb1be4e710edb136 (patch) | |
| tree | 6e9ead269e137eb8af37fdb56ffcb37264ac9d33 /net | |
| parent | 1beb52cea6cbfe24137587087e7818b620324714 (diff) | |
| download | linux-effa7afc5283ecbbdbb4af86eb1be4e710edb136.tar.xz | |
tcp: really ignore MSG_ZEROCOPY if no SO_ZEROCOPY
[ Upstream commit 5cf4a8532c992bb22a9ecd5f6d93f873f4eaccc2 ]
According to the documentation in msg_zerocopy.rst, the SO_ZEROCOPY
flag was introduced because send(2) ignores unknown message flags and
any legacy application which was accidentally passing the equivalent of
MSG_ZEROCOPY earlier should not see any new behaviour.
Before commit f214f915e7db ("tcp: enable MSG_ZEROCOPY"), a send(2) call
which passed the equivalent of MSG_ZEROCOPY without setting SO_ZEROCOPY
would succeed. However, after that commit, it fails with -ENOBUFS. So
it appears that the SO_ZEROCOPY flag fails to fulfill its intended
purpose. Fix it.
Fixes: f214f915e7db ("tcp: enable MSG_ZEROCOPY")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/skbuff.c | 3 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
2 files changed, 1 insertions, 4 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 168a3e8883d4..9f80b947f53b 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -937,9 +937,6 @@ struct ubuf_info *sock_zerocopy_alloc(struct sock *sk, size_t size) WARN_ON_ONCE(!in_task()); - if (!sock_flag(sk, SOCK_ZEROCOPY)) - return NULL; - skb = sock_omalloc(sk, 0, GFP_KERNEL); if (!skb) return NULL; diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 7462ec7587ce..f9c985460faa 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1177,7 +1177,7 @@ int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) flags = msg->msg_flags; - if (flags & MSG_ZEROCOPY && size) { + if (flags & MSG_ZEROCOPY && size && sock_flag(sk, SOCK_ZEROCOPY)) { if (sk->sk_state != TCP_ESTABLISHED) { err = -EINVAL; goto out_err; |