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Commit 615e51fd authored by Paul Moore's avatar Paul Moore
Browse files

selinux: reduce the number of calls to synchronize_net() when flushing caches 



When flushing the AVC, such as during a policy load, the various
network caches are also flushed, with each making a call to
synchronize_net() which has shown to be expensive in some cases.
This patch consolidates the network cache flushes into a single AVC
callback which only calls synchronize_net() once for each AVC cache
flush.

Reported-by: default avatarJaejyn Shin <flagon22bass@gmail.com>
Signed-off-by: default avatarPaul Moore <pmoore@redhat.com>
parent f31e7994

security/selinux/hooks.c

+14 −0
Original line number Diff line number Diff line
@@ -161,6 +161,17 @@ static int selinux_peerlbl_enabled(void) 
	return (selinux_policycap_alwaysnetwork || netlbl_enabled() || selinux_xfrm_enabled());

}



static int selinux_netcache_avc_callback(u32 event)

{

	if (event == AVC_CALLBACK_RESET) {

		sel_netif_flush();

		sel_netnode_flush();

		sel_netport_flush();

		synchronize_net();

	}

	return 0;

}



/*

 * initialise the security for the init task

 */
@@ -5993,6 +6004,9 @@ static __init int selinux_init(void) 
	if (register_security(&selinux_ops))

		panic("SELinux: Unable to register with kernel.\n");



	if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))

		panic("SELinux: Unable to register AVC netcache callback\n");



	if (selinux_enforcing)

		printk(KERN_DEBUG "SELinux:  Starting in enforcing mode\n");

	else

security/selinux/include/netif.h

+2 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ 
#ifndef _SELINUX_NETIF_H_

#define _SELINUX_NETIF_H_



void sel_netif_flush(void);



int sel_netif_sid(int ifindex, u32 *sid);



#endif	/* _SELINUX_NETIF_H_ */

security/selinux/include/netnode.h

+2 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ 
#ifndef _SELINUX_NETNODE_H

#define _SELINUX_NETNODE_H



void sel_netnode_flush(void);



int sel_netnode_sid(void *addr, u16 family, u32 *sid);



#endif

security/selinux/include/netport.h

+2 −0
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
#ifndef _SELINUX_NETPORT_H

#define _SELINUX_NETPORT_H



void sel_netport_flush(void);



int sel_netport_sid(u8 protocol, u16 pnum, u32 *sid);



#endif

security/selinux/netif.c

+1 −14
Original line number Diff line number Diff line
@@ -240,7 +240,7 @@ static void sel_netif_kill(int ifindex) 
 * Remove all entries from the network interface table.

 *

 */

static void sel_netif_flush(void)

void sel_netif_flush(void)

{

	int idx;

	struct sel_netif *netif;
@@ -252,15 +252,6 @@ static void sel_netif_flush(void) 
	spin_unlock_bh(&sel_netif_lock);

}



static int sel_netif_avc_callback(u32 event)

{

	if (event == AVC_CALLBACK_RESET) {

		sel_netif_flush();

		synchronize_net();

	}

	return 0;

}



static int sel_netif_netdev_notifier_handler(struct notifier_block *this,

					     unsigned long event, void *ptr)

{
@@ -291,10 +282,6 @@ static __init int sel_netif_init(void) 


	register_netdevice_notifier(&sel_netif_netdev_notifier);



	err = avc_add_callback(sel_netif_avc_callback, AVC_CALLBACK_RESET);

	if (err)

		panic("avc_add_callback() failed, error %d\n", err);



	return err;

}