mirror of https://gitee.com/openkylin/linux.git
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* A security identifier table (sidtab) is a lookup table
|
|
* of security context structures indexed by SID value.
|
|
*
|
|
* Original author: Stephen Smalley, <sds@tycho.nsa.gov>
|
|
* Author: Ondrej Mosnacek, <omosnacek@gmail.com>
|
|
*
|
|
* Copyright (C) 2018 Red Hat, Inc.
|
|
*/
|
|
#ifndef _SS_SIDTAB_H_
|
|
#define _SS_SIDTAB_H_
|
|
|
|
#include <linux/spinlock_types.h>
|
|
#include <linux/log2.h>
|
|
|
|
#include "context.h"
|
|
|
|
struct sidtab_entry_leaf {
|
|
struct context context;
|
|
};
|
|
|
|
struct sidtab_node_inner;
|
|
struct sidtab_node_leaf;
|
|
|
|
union sidtab_entry_inner {
|
|
struct sidtab_node_inner *ptr_inner;
|
|
struct sidtab_node_leaf *ptr_leaf;
|
|
};
|
|
|
|
/* align node size to page boundary */
|
|
#define SIDTAB_NODE_ALLOC_SHIFT PAGE_SHIFT
|
|
#define SIDTAB_NODE_ALLOC_SIZE PAGE_SIZE
|
|
|
|
#define size_to_shift(size) ((size) == 1 ? 1 : (const_ilog2((size) - 1) + 1))
|
|
|
|
#define SIDTAB_INNER_SHIFT \
|
|
(SIDTAB_NODE_ALLOC_SHIFT - size_to_shift(sizeof(union sidtab_entry_inner)))
|
|
#define SIDTAB_INNER_ENTRIES ((size_t)1 << SIDTAB_INNER_SHIFT)
|
|
#define SIDTAB_LEAF_ENTRIES \
|
|
(SIDTAB_NODE_ALLOC_SIZE / sizeof(struct sidtab_entry_leaf))
|
|
|
|
#define SIDTAB_MAX_BITS 31 /* limited to INT_MAX due to atomic_t range */
|
|
#define SIDTAB_MAX (((u32)1 << SIDTAB_MAX_BITS) - 1)
|
|
/* ensure enough tree levels for SIDTAB_MAX entries */
|
|
#define SIDTAB_MAX_LEVEL \
|
|
DIV_ROUND_UP(SIDTAB_MAX_BITS - size_to_shift(SIDTAB_LEAF_ENTRIES), \
|
|
SIDTAB_INNER_SHIFT)
|
|
|
|
struct sidtab_node_leaf {
|
|
struct sidtab_entry_leaf entries[SIDTAB_LEAF_ENTRIES];
|
|
};
|
|
|
|
struct sidtab_node_inner {
|
|
union sidtab_entry_inner entries[SIDTAB_INNER_ENTRIES];
|
|
};
|
|
|
|
struct sidtab_isid_entry {
|
|
int set;
|
|
struct context context;
|
|
};
|
|
|
|
struct sidtab_convert_params {
|
|
int (*func)(struct context *oldc, struct context *newc, void *args);
|
|
void *args;
|
|
struct sidtab *target;
|
|
};
|
|
|
|
#define SIDTAB_RCACHE_SIZE 3
|
|
|
|
struct sidtab {
|
|
union sidtab_entry_inner roots[SIDTAB_MAX_LEVEL + 1];
|
|
atomic_t count;
|
|
struct sidtab_convert_params *convert;
|
|
spinlock_t lock;
|
|
|
|
/* reverse lookup cache */
|
|
atomic_t rcache[SIDTAB_RCACHE_SIZE];
|
|
|
|
/* index == SID - 1 (no entry for SECSID_NULL) */
|
|
struct sidtab_isid_entry isids[SECINITSID_NUM];
|
|
};
|
|
|
|
int sidtab_init(struct sidtab *s);
|
|
int sidtab_set_initial(struct sidtab *s, u32 sid, struct context *context);
|
|
struct context *sidtab_search(struct sidtab *s, u32 sid);
|
|
struct context *sidtab_search_force(struct sidtab *s, u32 sid);
|
|
|
|
int sidtab_convert(struct sidtab *s, struct sidtab_convert_params *params);
|
|
|
|
int sidtab_context_to_sid(struct sidtab *s, struct context *context, u32 *sid);
|
|
|
|
void sidtab_destroy(struct sidtab *s);
|
|
|
|
#endif /* _SS_SIDTAB_H_ */
|
|
|
|
|