LXR linux/security/apparmor/include/policy

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * AppArmor security module
   4 *
   5 * This file contains AppArmor policy loading interface function definitions.
   6 *
   7 * Copyright (C) 1998-2008 Novell/SUSE
   8 * Copyright 2009-2010 Canonical Ltd.
   9 */
  10
  11#ifndef __POLICY_INTERFACE_H
  12#define __POLICY_INTERFACE_H
  13
  14#include <linux/list.h>
  15#include <linux/kref.h>
  16#include <linux/dcache.h>
  17#include <linux/workqueue.h>
  18
  19struct aa_load_ent {
  20        struct list_head list;
  21        struct aa_profile *new;
  22        struct aa_profile *old;
  23        struct aa_profile *rename;
  24        const char *ns_name;
  25};
  26
  27void aa_load_ent_free(struct aa_load_ent *ent);
  28struct aa_load_ent *aa_load_ent_alloc(void);
  29
  30#define PACKED_FLAG_HAT         1
  31
  32#define PACKED_MODE_ENFORCE     0
  33#define PACKED_MODE_COMPLAIN    1
  34#define PACKED_MODE_KILL        2
  35#define PACKED_MODE_UNCONFINED  3
  36
  37struct aa_ns;
  38
  39enum {
  40        AAFS_LOADDATA_ABI = 0,
  41        AAFS_LOADDATA_REVISION,
  42        AAFS_LOADDATA_HASH,
  43        AAFS_LOADDATA_DATA,
  44        AAFS_LOADDATA_DIR,              /* must be last actual entry */
  45        AAFS_LOADDATA_NDENTS            /* count of entries */
  46};
  47
  48/*
  49 * struct aa_loaddata - buffer of policy raw_data set
  50 *
  51 * there is no loaddata ref for being on ns list, nor a ref from
  52 * d_inode(@dentry) when grab a ref from these, @ns->lock must be held
  53 * && __aa_get_loaddata() needs to be used, and the return value
  54 * checked, if NULL the loaddata is already being reaped and should be
  55 * considered dead.
  56 */
  57struct aa_loaddata {
  58        struct kref count;
  59        struct list_head list;
  60        struct work_struct work;
  61        struct dentry *dents[AAFS_LOADDATA_NDENTS];
  62        struct aa_ns *ns;
  63        char *name;
  64        size_t size;
  65        long revision;                  /* the ns policy revision this caused */
  66        int abi;
  67        unsigned char *hash;
  68
  69        char *data;
  70};
  71
  72int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
  73
  74/**
  75 * __aa_get_loaddata - get a reference count to uncounted data reference
  76 * @data: reference to get a count on
  77 *
  78 * Returns: pointer to reference OR NULL if race is lost and reference is
  79 *          being repeated.
  80 * Requires: @data->ns->lock held, and the return code MUST be checked
  81 *
  82 * Use only from inode->i_private and @data->list found references
  83 */
  84static inline struct aa_loaddata *
  85__aa_get_loaddata(struct aa_loaddata *data)
  86{
  87        if (data && kref_get_unless_zero(&(data->count)))
  88                return data;
  89
  90        return NULL;
  91}
  92
  93/**
  94 * aa_get_loaddata - get a reference count from a counted data reference
  95 * @data: reference to get a count on
  96 *
  97 * Returns: point to reference
  98 * Requires: @data to have a valid reference count on it. It is a bug
  99 *           if the race to reap can be encountered when it is used.
 100 */
 101static inline struct aa_loaddata *
 102aa_get_loaddata(struct aa_loaddata *data)
 103{
 104        struct aa_loaddata *tmp = __aa_get_loaddata(data);
 105
 106        AA_BUG(data && !tmp);
 107
 108        return tmp;
 109}
 110
 111void __aa_loaddata_update(struct aa_loaddata *data, long revision);
 112bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
 113void aa_loaddata_kref(struct kref *kref);
 114struct aa_loaddata *aa_loaddata_alloc(size_t size);
 115static inline void aa_put_loaddata(struct aa_loaddata *data)
 116{
 117        if (data)
 118                kref_put(&data->count, aa_loaddata_kref);
 119}
 120
 121#endif /* __POLICY_INTERFACE_H */
 122