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 19 struct 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 27 void aa_load_ent_free(struct aa_load_ent *ent); 28 struct aa_load_ent *aa_load_ent_alloc(void); 29 30 #define PACKED_FLAG_HAT 1 31 #define PACKED_FLAG_DEBUG1 2 32 #define PACKED_FLAG_DEBUG2 4 33 34 #define PACKED_MODE_ENFORCE 0 35 #define PACKED_MODE_COMPLAIN 1 36 #define PACKED_MODE_KILL 2 37 #define PACKED_MODE_UNCONFINED 3 38 39 struct aa_ns; 40 41 enum { 42 AAFS_LOADDATA_ABI = 0, 43 AAFS_LOADDATA_REVISION, 44 AAFS_LOADDATA_HASH, 45 AAFS_LOADDATA_DATA, 46 AAFS_LOADDATA_COMPRESSED_SIZE, 47 AAFS_LOADDATA_DIR, /* must be last actual entry */ 48 AAFS_LOADDATA_NDENTS /* count of entries */ 49 }; 50 51 /* 52 * struct aa_loaddata - buffer of policy raw_data set 53 * 54 * there is no loaddata ref for being on ns list, nor a ref from 55 * d_inode(@dentry) when grab a ref from these, @ns->lock must be held 56 * && __aa_get_loaddata() needs to be used, and the return value 57 * checked, if NULL the loaddata is already being reaped and should be 58 * considered dead. 59 */ 60 struct aa_loaddata { 61 struct kref count; 62 struct list_head list; 63 struct work_struct work; 64 struct dentry *dents[AAFS_LOADDATA_NDENTS]; 65 struct aa_ns *ns; 66 char *name; 67 size_t size; /* the original size of the payload */ 68 size_t compressed_size; /* the compressed size of the payload */ 69 long revision; /* the ns policy revision this caused */ 70 int abi; 71 unsigned char *hash; 72 73 /* Pointer to payload. If @compressed_size > 0, then this is the 74 * compressed version of the payload, else it is the uncompressed 75 * version (with the size indicated by @size). 76 */ 77 char *data; 78 }; 79 80 int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns); 81 82 /** 83 * __aa_get_loaddata - get a reference count to uncounted data reference 84 * @data: reference to get a count on 85 * 86 * Returns: pointer to reference OR NULL if race is lost and reference is 87 * being repeated. 88 * Requires: @data->ns->lock held, and the return code MUST be checked 89 * 90 * Use only from inode->i_private and @data->list found references 91 */ 92 static inline struct aa_loaddata * 93 __aa_get_loaddata(struct aa_loaddata *data) 94 { 95 if (data && kref_get_unless_zero(&(data->count))) 96 return data; 97 98 return NULL; 99 } 100 101 /** 102 * aa_get_loaddata - get a reference count from a counted data reference 103 * @data: reference to get a count on 104 * 105 * Returns: point to reference 106 * Requires: @data to have a valid reference count on it. It is a bug 107 * if the race to reap can be encountered when it is used. 108 */ 109 static inline struct aa_loaddata * 110 aa_get_loaddata(struct aa_loaddata *data) 111 { 112 struct aa_loaddata *tmp = __aa_get_loaddata(data); 113 114 AA_BUG(data && !tmp); 115 116 return tmp; 117 } 118 119 void __aa_loaddata_update(struct aa_loaddata *data, long revision); 120 bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r); 121 void aa_loaddata_kref(struct kref *kref); 122 struct aa_loaddata *aa_loaddata_alloc(size_t size); 123 static inline void aa_put_loaddata(struct aa_loaddata *data) 124 { 125 if (data) 126 kref_put(&data->count, aa_loaddata_kref); 127 } 128 129 #endif /* __POLICY_INTERFACE_H */ 130