* 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,
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) {
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) {
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 &&
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 &&
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;
}
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++;
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[] = {
AVTAB_MEMBER
};
-int avtab_read_item(void *fp, u32 vers, struct avtab *a,
+int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
int (*insertf)(struct avtab *a, struct avtab_key *k,
struct avtab_datum *d, void *p),
void *p)
__le16 buf16[4];
u16 enabled;
__le32 buf32[7];
- u32 items, items2, val;
+ u32 items, items2, val, vers = pol->policyvers;
struct avtab_key key;
struct avtab_datum datum;
int i, rc;
+ unsigned set;
memset(&key, 0, sizeof(struct avtab_key));
memset(&datum, 0, sizeof(struct avtab_datum));
key.target_class = le16_to_cpu(buf16[items++]);
key.specified = le16_to_cpu(buf16[items++]);
+ if (!policydb_type_isvalid(pol, key.source_type) ||
+ !policydb_type_isvalid(pol, key.target_type) ||
+ !policydb_class_isvalid(pol, key.target_class)) {
+ printk(KERN_WARNING "security: avtab: invalid type or class\n");
+ return -1;
+ }
+
+ set = 0;
+ for (i = 0; i < ARRAY_SIZE(spec_order); i++) {
+ if (key.specified & spec_order[i])
+ set++;
+ }
+ if (!set || set > 1) {
+ printk(KERN_WARNING
+ "security: avtab: more than one specifier\n");
+ return -1;
+ }
+
rc = next_entry(buf32, fp, sizeof(u32));
if (rc < 0) {
printk("security: avtab: truncated entry\n");
return -1;
}
datum.data = le32_to_cpu(*buf32);
+ if ((key.specified & AVTAB_TYPE) &&
+ !policydb_type_isvalid(pol, datum.data)) {
+ printk(KERN_WARNING "security: avtab: invalid type\n");
+ return -1;
+ }
return insertf(a, &key, &datum, p);
}
return avtab_insert(a, k, d);
}
-int avtab_read(struct avtab *a, void *fp, u32 vers)
+int avtab_read(struct avtab *a, void *fp, struct policydb *pol)
{
int rc;
__le32 buf[1];
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);
+ rc = avtab_read_item(a, fp, pol, avtab_insertf, NULL);
if (rc) {
if (rc == -ENOMEM)
printk(KERN_ERR "security: avtab: out of memory\n");
{
avtab_node_cachep = kmem_cache_create("avtab_node",
sizeof(struct avtab_node),
- 0, SLAB_PANIC, NULL, NULL);
+ 0, SLAB_PANIC, NULL);
}
void avtab_cache_destroy(void)
projects / linux-2.6 / blobdiff