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selinux: Move avtab_hash() to a shared location for future reuse

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This is a preparation patch, no functional change.

Signed-off-by: Hongru Zhang <zhanghongru@xiaomi.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Hongru Zhang
2025-10-23 19:29:54 +08:00
committed by Paul Moore
parent 641e021758
commit 929126ef4a
2 changed files with 47 additions and 40 deletions
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46
security/selinux/include/hash.h Normal file
View File

@@ -0,0 +1,46 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _SELINUX_HASH_H_
#define _SELINUX_HASH_H_
/* Based on MurmurHash3, written by Austin Appleby and placed in the
* public domain.
*/
static inline u32 avtab_hash(const struct avtab_key *keyp, u32 mask)
{
static const u32 c1 = 0xcc9e2d51;
static const u32 c2 = 0x1b873593;
static const u32 r1 = 15;
static const u32 r2 = 13;
static const u32 m = 5;
static const u32 n = 0xe6546b64;
u32 hash = 0;
#define mix(input) \
do { \
u32 v = input; \
v *= c1; \
v = (v << r1) | (v >> (32 - r1)); \
v *= c2; \
hash ^= v; \
hash = (hash << r2) | (hash >> (32 - r2)); \
hash = hash * m + n; \
} while (0)
mix(keyp->target_class);
mix(keyp->target_type);
mix(keyp->source_type);
#undef mix
hash ^= hash >> 16;
hash *= 0x85ebca6b;
hash ^= hash >> 13;
hash *= 0xc2b2ae35;
hash ^= hash >> 16;
return hash & mask;
}
#endif /* _SELINUX_HASH_H_ */

41
security/selinux/ss/avtab.c
View File

@@ -20,50 +20,11 @@
#include <linux/errno.h>
#include "avtab.h"
#include "policydb.h"
#include "hash.h"
static struct kmem_cache *avtab_node_cachep __ro_after_init;
static struct kmem_cache *avtab_xperms_cachep __ro_after_init;
/* Based on MurmurHash3, written by Austin Appleby and placed in the
* public domain.
*/
static inline u32 avtab_hash(const struct avtab_key *keyp, u32 mask)
{
static const u32 c1 = 0xcc9e2d51;
static const u32 c2 = 0x1b873593;
static const u32 r1 = 15;
static const u32 r2 = 13;
static const u32 m = 5;
static const u32 n = 0xe6546b64;
u32 hash = 0;
#define mix(input) \
do { \
u32 v = input; \
v *= c1; \
v = (v << r1) | (v >> (32 - r1)); \
v *= c2; \
hash ^= v; \
hash = (hash << r2) | (hash >> (32 - r2)); \
hash = hash * m + n; \
} while (0)
mix(keyp->target_class);
mix(keyp->target_type);
mix(keyp->source_type);
#undef mix
hash ^= hash >> 16;
hash *= 0x85ebca6b;
hash ^= hash >> 13;
hash *= 0xc2b2ae35;
hash ^= hash >> 16;
return hash & mask;
}
static struct avtab_node *avtab_insert_node(struct avtab *h,
struct avtab_node **dst,
const struct avtab_key *key,