From: Siarhei Liakh <siarhei.liakh@xxxxxxxxxxxxxxxxx>
This change exposes previously hardcoded netport sizing tunables via Kconfig,
which provides a more convenient tuning mechanism for downstream distributions.
Default sizing is not affected.
Signed-off-by: Siarhei Liakh <siarhei.liakh@xxxxxxxxxxxxxxxxx>
---
Please CC me directly in all replies.
security/selinux/Kconfig | 20 ++++++++++++++++++++
security/selinux/netport.c | 4 ++--
2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig
index 23ec741b1ce6..d65626142bcf 100644
--- a/security/selinux/Kconfig
+++ b/security/selinux/Kconfig
@@ -133,6 +133,26 @@ config SECURITY_SELINUX_PDB_FILE_TR_HASH_BITS
used for File Transitions hash table. Smaller value reduces memory
footprint at price of hash table lookup efficiency.
+config SECURITY_SELINUX_NETPORT_HASH_BITS
+ int "Number of slots (buckets) for Netport hash table, expressed as number of bits (i.e. 2^n)"
+ depends on SECURITY_SELINUX
+ range 1 16
+ default "8"
+ help
+ This is a power of 2 representing the number of slots (buckets)
+ used for Netport hash table. Smaller value reduces memory
+ footprint at price of hash table lookup efficiency.
+
+config SECURITY_SELINUX_NETPORT_HASH_BLIMIT
+ int "Bucket size limit for Netport hash table."
+ depends on SECURITY_SELINUX
+ range 1 131072
+ default "16"
+ help
+ This is a an upper limit on number of entries a bucket can hold
+ within Netport hash. Lower values conserve memory at price of
+ more expensive lookups when a Netport cache miss occurs.
+
config SECURITY_SELINUX_CHECKREQPROT_VALUE
int "NSA SELinux checkreqprot default value"
depends on SECURITY_SELINUX
diff --git a/security/selinux/netport.c b/security/selinux/netport.c
index de727f7489b7..ef8e9abcadf7 100644
--- a/security/selinux/netport.c
+++ b/security/selinux/netport.c
@@ -32,8 +32,8 @@
#include "netport.h"
#include "objsec.h"
-#define SEL_NETPORT_HASH_SIZE 256
-#define SEL_NETPORT_HASH_BKT_LIMIT 16
+#define SEL_NETPORT_HASH_SIZE (1 << CONFIG_SECURITY_SELINUX_NETPORT_HASH_BITS)
+#define SEL_NETPORT_HASH_BKT_LIMIT CONFIG_SECURITY_SELINUX_NETPORT_HASH_BLIMIT
struct sel_netport_bkt {
int size;
--
2.17.1
