Revert "selinux: add a skb_owned_by() hook"

This reverts commit ca10b9e9a8ca7342ee07065289cbe74ac128c169.

No longer needed after commit eb8895debe1baba41fcb62c78a16f0c63c21662a
("tcp: tcp_make_synack() should use sock_wmalloc")

When under SYNFLOOD, we build lot of SYNACK and hit false sharing
because of multiple modifications done on sk_listener->sk_wmem_alloc

Since tcp_make_synack() uses sock_wmalloc(), there is no need
to call skb_set_owner_w() again, as this adds two atomic operations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 6 deletions

diff --git a/security/capability.c b/security/capability.c
index 070dd46f62f4..58a1600c149b 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -776,11 +776,6 @@ static int cap_tun_dev_open(void *security)
 {
         return 0;
 }
-
-static void cap_skb_owned_by(struct sk_buff *skb, struct sock *sk)
-{
-}
-
 #endif  /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
@@ -1134,7 +1129,6 @@ void __init security_fixup_ops(struct security_operations *ops)
         set_to_cap_if_null(ops, tun_dev_open);
         set_to_cap_if_null(ops, tun_dev_attach_queue);
         set_to_cap_if_null(ops, tun_dev_attach);
-        set_to_cap_if_null(ops, skb_owned_by);
 #endif  /* CONFIG_SECURITY_NETWORK */
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
         set_to_cap_if_null(ops, xfrm_policy_alloc_security);