SELinux: tune avtab to reduce memory usage

This patch reduces memory usage of SELinux by tuning avtab. Number of hash
slots in avtab was 32768. Unused slots used memory when number of rules is
fewer. This patch decides number of hash slots dynamically based on number
of rules. (chain length)^2 is also printed out in avtab_hash_eval to see
standard deviation of avtab hash table.

Signed-off-by: Yuichi Nakamura<ynakam@hitachisoft.jp>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>

4 files changed, 82 insertions, 36 deletions

diff --git a/security/selinux/ss/avtab.c b/security/selinux/ss/avtab.c
index 85705eb289e0..7551af1f7899 100644
--- a/security/selinux/ss/avtab.c
+++ b/security/selinux/ss/avtab.c
@@ -12,24 +12,25 @@
  *      This program is free software; you can redistribute it and/or modify
  *      it under the terms of the GNU General Public License as published by
  *      the Free Software Foundation, version 2.
+ *
+ * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
+ *      Tuned number of hash slots for avtab to reduce memory usage
  */
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
-#include <linux/vmalloc.h>
 #include <linux/errno.h>
-
 #include "avtab.h"
 #include "policydb.h"
 
-#define AVTAB_HASH(keyp) \
-((keyp->target_class + \
- (keyp->target_type << 2) + \
- (keyp->source_type << 9)) & \
- AVTAB_HASH_MASK)
-
 static struct kmem_cache *avtab_node_cachep;
 
+static inline int avtab_hash(struct avtab_key *keyp, u16 mask)
+{
+        return ((keyp->target_class + (keyp->target_type << 2) +
+                 (keyp->source_type << 9)) & mask);
+}
+
 static struct avtab_node*
 avtab_insert_node(struct avtab *h, int hvalue,
                   struct avtab_node * prev, struct avtab_node * cur,
@@ -59,10 +60,10 @@ static int avtab_insert(struct avtab *h, struct avtab_key *key, struct avtab_dat
         struct avtab_node *prev, *cur, *newnode;
         u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
 
-        if (!h)
+        if (!h || !h->htable)
                 return -EINVAL;
 
-        hvalue = AVTAB_HASH(key);
+        hvalue = avtab_hash(key, h->mask);
         for (prev = NULL, cur = h->htable[hvalue];
              cur;
              prev = cur, cur = cur->next) {
@@ -100,9 +101,9 @@ avtab_insert_nonunique(struct avtab * h, struct avtab_key * key, struct avtab_da
         struct avtab_node *prev, *cur, *newnode;
         u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
 
-        if (!h)
+        if (!h || !h->htable)
                 return NULL;
-        hvalue = AVTAB_HASH(key);
+        hvalue = avtab_hash(key, h->mask);
         for (prev = NULL, cur = h->htable[hvalue];
              cur;
              prev = cur, cur = cur->next) {
@@ -132,10 +133,10 @@ struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key)
         struct avtab_node *cur;
         u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
 
-        if (!h)
+        if (!h || !h->htable)
                 return NULL;
 
-        hvalue = AVTAB_HASH(key);
+        hvalue = avtab_hash(key, h->mask);
         for (cur = h->htable[hvalue]; cur; cur = cur->next) {
                 if (key->source_type == cur->key.source_type &&
                     key->target_type == cur->key.target_type &&
@@ -167,10 +168,10 @@ avtab_search_node(struct avtab *h, struct avtab_key *key)
         struct avtab_node *cur;
         u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
 
-        if (!h)
+        if (!h || !h->htable)
                 return NULL;
 
-        hvalue = AVTAB_HASH(key);
+        hvalue = avtab_hash(key, h->mask);
         for (cur = h->htable[hvalue]; cur; cur = cur->next) {
                 if (key->source_type == cur->key.source_type &&
                     key->target_type == cur->key.target_type &&
@@ -228,7 +229,7 @@ void avtab_destroy(struct avtab *h)
         if (!h || !h->htable)
                 return;
 
-        for (i = 0; i < AVTAB_SIZE; i++) {
+        for (i = 0; i < h->nslot; i++) {
                 cur = h->htable[i];
                 while (cur != NULL) {
                         temp = cur;
@@ -237,32 +238,63 @@ void avtab_destroy(struct avtab *h)
                 }
                 h->htable[i] = NULL;
         }
-        vfree(h->htable);
+        kfree(h->htable);
         h->htable = NULL;
+        h->nslot = 0;
+        h->mask = 0;
 }
 
-
 int avtab_init(struct avtab *h)
 {
-        int i;
+        h->htable = NULL;
+        h->nel = 0;
+        return 0;
+}
+
+int avtab_alloc(struct avtab *h, u32 nrules)
+{
+        u16 mask = 0;
+        u32 shift = 0;
+        u32 work = nrules;
+        u32 nslot = 0;
+
+        if (nrules == 0)
+                goto avtab_alloc_out;
 
-        h->htable = vmalloc(sizeof(*(h->htable)) * AVTAB_SIZE);
+        while (work) {
+                work  = work >> 1;
+                shift++;
+        }
+        if (shift > 2)
+                shift = shift - 2;
+        nslot = 1 << shift;
+        if (nslot > MAX_AVTAB_SIZE)
+                nslot = MAX_AVTAB_SIZE;
+        mask = nslot - 1;
+
+        h->htable = kcalloc(nslot, sizeof(*(h->htable)), GFP_KERNEL);
         if (!h->htable)
                 return -ENOMEM;
-        for (i = 0; i < AVTAB_SIZE; i++)
-                h->htable[i] = NULL;
+
+ avtab_alloc_out:
         h->nel = 0;
+        h->nslot = nslot;
+        h->mask = mask;
+        printk(KERN_DEBUG "SELinux:%d avtab hash slots allocated."
+               "Num of rules:%d\n", h->nslot, nrules);
         return 0;
 }
 
 void avtab_hash_eval(struct avtab *h, char *tag)
 {
         int i, chain_len, slots_used, max_chain_len;
+        unsigned long long chain2_len_sum;
         struct avtab_node *cur;
 
         slots_used = 0;
         max_chain_len = 0;
-        for (i = 0; i < AVTAB_SIZE; i++) {
+        chain2_len_sum = 0;
+        for (i = 0; i < h->nslot; i++) {
                 cur = h->htable[i];
                 if (cur) {
                         slots_used++;
@@ -274,12 +306,14 @@ void avtab_hash_eval(struct avtab *h, char *tag)
 
                         if (chain_len > max_chain_len)
                                 max_chain_len = chain_len;
+                        chain2_len_sum += chain_len * chain_len;
                 }
         }
 
         printk(KERN_DEBUG "%s:  %d entries and %d/%d buckets used, longest "
-               "chain length %d\n", tag, h->nel, slots_used, AVTAB_SIZE,
-               max_chain_len);
+               "chain length %d sum of chain length^2 %Lu\n",
+               tag, h->nel, slots_used, h->nslot, max_chain_len,
+               chain2_len_sum);
 }
 
 static uint16_t spec_order[] = {
@@ -419,6 +453,11 @@ int avtab_read(struct avtab *a, void *fp, u32 vers)
                 rc = -EINVAL;
                 goto bad;
         }
+
+        rc = avtab_alloc(a, nel);
+        if (rc)
+                goto bad;
+
         for (i = 0; i < nel; i++) {
                 rc = avtab_read_item(fp,vers, a, avtab_insertf, NULL);
                 if (rc) {
diff --git a/security/selinux/ss/avtab.h b/security/selinux/ss/avtab.h
index 0a90d939af93..d8edf8ca56d1 100644
--- a/security/selinux/ss/avtab.h
+++ b/security/selinux/ss/avtab.h
@@ -16,6 +16,9 @@
  *      This program is free software; you can redistribute it and/or modify
  *      it under the terms of the GNU General Public License as published by
  *      the Free Software Foundation, version 2.
+ *
+ * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
+ *      Tuned number of hash slots for avtab to reduce memory usage
  */
 #ifndef _SS_AVTAB_H_
 #define _SS_AVTAB_H_
@@ -50,9 +53,13 @@ struct avtab_node {
 struct avtab {
         struct avtab_node **htable;
         u32 nel;        /* number of elements */
+        u32 nslot;      /* number of hash slots */
+        u16 mask;       /* mask to compute hash func */
+
 };
 
 int avtab_init(struct avtab *);
+int avtab_alloc(struct avtab *, u32);
 struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *k);
 void avtab_destroy(struct avtab *h);
 void avtab_hash_eval(struct avtab *h, char *tag);
@@ -74,11 +81,10 @@ struct avtab_node *avtab_search_node_next(struct avtab_node *node, int specified
 void avtab_cache_init(void);
 void avtab_cache_destroy(void);
 
-#define AVTAB_HASH_BITS 15
-#define AVTAB_HASH_BUCKETS (1 << AVTAB_HASH_BITS)
-#define AVTAB_HASH_MASK (AVTAB_HASH_BUCKETS-1)
-
-#define AVTAB_SIZE AVTAB_HASH_BUCKETS
+#define MAX_AVTAB_HASH_BITS 13
+#define MAX_AVTAB_HASH_BUCKETS (1 << MAX_AVTAB_HASH_BITS)
+#define MAX_AVTAB_HASH_MASK (MAX_AVTAB_HASH_BUCKETS-1)
+#define MAX_AVTAB_SIZE MAX_AVTAB_HASH_BUCKETS
 
 #endif  /* _SS_AVTAB_H_ */
 
diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index d2737edba541..45b93a827c80 100644
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -456,6 +456,10 @@ int cond_read_list(struct policydb *p, void *fp)
 
         len = le32_to_cpu(buf[0]);
 
+        rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel);
+        if (rc)
+                goto err;
+
         for (i = 0; i < len; i++) {
                 node = kzalloc(sizeof(struct cond_node), GFP_KERNEL);
                 if (!node)
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index f05f97a2bc3a..5ecbad7d8b9f 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -177,18 +177,15 @@ static int policydb_init(struct policydb *p)
 
         rc = roles_init(p);
         if (rc)
-                goto out_free_avtab;
+                goto out_free_symtab;
 
         rc = cond_policydb_init(p);
         if (rc)
-                goto out_free_avtab;
+                goto out_free_symtab;
 
 out:
         return rc;
 
-out_free_avtab:
-        avtab_destroy(&p->te_avtab);
-
 out_free_symtab:
         for (i = 0; i < SYM_NUM; i++)
                 hashtab_destroy(p->symtab[i].table);