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: Jaejyn Shin <flagon22bass@gmail.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>

3 files changed, 6 insertions, 0 deletions

diff --git a/security/selinux/include/netif.h b/security/selinux/include/netif.h
index 43d507242b42..57c6eae81eac 100644
--- a/security/selinux/include/netif.h
+++ b/security/selinux/include/netif.h
@@ -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_ */
diff --git a/security/selinux/include/netnode.h b/security/selinux/include/netnode.h
index df7a5ed6c694..937668dd3024 100644
--- a/security/selinux/include/netnode.h
+++ b/security/selinux/include/netnode.h
@@ -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
diff --git a/security/selinux/include/netport.h b/security/selinux/include/netport.h
index 4d965b83d735..d1ce896b2cb0 100644
--- a/security/selinux/include/netport.h
+++ b/security/selinux/include/netport.h
@@ -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