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Commit d3593b5c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

Revert "selinux: add a skb_owned_by() hook" 



This reverts commit ca10b9e9.

No longer needed after commit eb8895de
("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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f6877fcf

include/linux/security.h

+0 −8
Original line number Diff line number Diff line
@@ -1716,7 +1716,6 @@ struct security_operations { 
	int (*tun_dev_attach_queue) (void *security);

	int (*tun_dev_attach) (struct sock *sk, void *security);

	int (*tun_dev_open) (void *security);

	void (*skb_owned_by) (struct sk_buff *skb, struct sock *sk);

#endif	/* CONFIG_SECURITY_NETWORK */



#ifdef CONFIG_SECURITY_NETWORK_XFRM
@@ -2735,8 +2734,6 @@ int security_tun_dev_attach_queue(void *security); 
int security_tun_dev_attach(struct sock *sk, void *security);

int security_tun_dev_open(void *security);



void security_skb_owned_by(struct sk_buff *skb, struct sock *sk);



#else	/* CONFIG_SECURITY_NETWORK */

static inline int security_unix_stream_connect(struct sock *sock,

					       struct sock *other,
@@ -2928,11 +2925,6 @@ static inline int security_tun_dev_open(void *security) 
{

	return 0;

}



static inline void security_skb_owned_by(struct sk_buff *skb, struct sock *sk)

{

}



#endif	/* CONFIG_SECURITY_NETWORK */



#ifdef CONFIG_SECURITY_NETWORK_XFRM

net/ipv4/tcp_output.c

+0 −1
Original line number Diff line number Diff line
@@ -2926,7 +2926,6 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst, 
	skb_reserve(skb, MAX_TCP_HEADER);



	skb_dst_set(skb, dst);

	security_skb_owned_by(skb, sk);



	mss = dst_metric_advmss(dst);

	if (tp->rx_opt.user_mss && tp->rx_opt.user_mss < mss)

security/capability.c

+0 −6
Original line number Diff line number Diff line
@@ -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);

security/security.c

+0 −5
Original line number Diff line number Diff line
@@ -1359,11 +1359,6 @@ int security_tun_dev_open(void *security) 
}

EXPORT_SYMBOL(security_tun_dev_open);



void security_skb_owned_by(struct sk_buff *skb, struct sock *sk)

{

	security_ops->skb_owned_by(skb, sk);

}



#endif	/* CONFIG_SECURITY_NETWORK */



#ifdef CONFIG_SECURITY_NETWORK_XFRM

security/selinux/hooks.c

+0 −7
Original line number Diff line number Diff line
@@ -51,7 +51,6 @@ 
#include <linux/tty.h>

#include <net/icmp.h>

#include <net/ip.h>		/* for local_port_range[] */

#include <net/sock.h>

#include <net/tcp.h>		/* struct or_callable used in sock_rcv_skb */

#include <net/inet_connection_sock.h>

#include <net/net_namespace.h>
@@ -4652,11 +4651,6 @@ static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb) 
	selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);

}



static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk)

{

	skb_set_owner_w(skb, sk);

}



static int selinux_secmark_relabel_packet(u32 sid)

{

	const struct task_security_struct *__tsec;
@@ -6041,7 +6035,6 @@ static struct security_operations selinux_ops = { 
	.tun_dev_attach_queue =		selinux_tun_dev_attach_queue,

	.tun_dev_attach =		selinux_tun_dev_attach,

	.tun_dev_open =			selinux_tun_dev_open,

	.skb_owned_by =			selinux_skb_owned_by,



#ifdef CONFIG_SECURITY_NETWORK_XFRM

	.xfrm_policy_alloc_security =	selinux_xfrm_policy_alloc,