1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * AppArmor security module
5 * This file contains AppArmor contexts used to associate "labels" to objects.
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
11 #ifndef __AA_CONTEXT_H
12 #define __AA_CONTEXT_H
14 #include <linux/cred.h>
15 #include <linux/slab.h>
16 #include <linux/sched.h>
19 #include "policy_ns.h"
22 static inline struct aa_label *cred_label(const struct cred *cred)
24 struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
30 static inline void set_cred_label(const struct cred *cred,
31 struct aa_label *label)
33 struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
40 * aa_cred_raw_label - obtain cred's label
41 * @cred: cred to obtain label from (NOT NULL)
43 * Returns: confining label
45 * does NOT increment reference count
47 static inline struct aa_label *aa_cred_raw_label(const struct cred *cred)
49 struct aa_label *label = cred_label(cred);
56 * aa_get_newest_cred_label - obtain the newest label on a cred
57 * @cred: cred to obtain label from (NOT NULL)
59 * Returns: newest version of confining label
61 static inline struct aa_label *aa_get_newest_cred_label(const struct cred *cred)
63 return aa_get_newest_label(aa_cred_raw_label(cred));
67 * aa_current_raw_label - find the current tasks confining label
69 * Returns: up to date confining label or the ns unconfined label (NOT NULL)
71 * This fn will not update the tasks cred to the most up to date version
72 * of the label so it is safe to call when inside of locks.
74 static inline struct aa_label *aa_current_raw_label(void)
76 return aa_cred_raw_label(current_cred());
80 * aa_get_current_label - get the newest version of the current tasks label
82 * Returns: newest version of confining label (NOT NULL)
84 * This fn will not update the tasks cred, so it is safe inside of locks
86 * The returned reference must be put with aa_put_label()
88 static inline struct aa_label *aa_get_current_label(void)
90 struct aa_label *l = aa_current_raw_label();
92 if (label_is_stale(l))
93 return aa_get_newest_label(l);
94 return aa_get_label(l);
97 #define __end_current_label_crit_section(X) end_current_label_crit_section(X)
100 * end_label_crit_section - put a reference found with begin_current_label..
101 * @label: label reference to put
103 * Should only be used with a reference obtained with
104 * begin_current_label_crit_section and never used in situations where the
105 * task cred may be updated
107 static inline void end_current_label_crit_section(struct aa_label *label)
109 if (label != aa_current_raw_label())
114 * __begin_current_label_crit_section - current's confining label
116 * Returns: up to date confining label or the ns unconfined label (NOT NULL)
118 * safe to call inside locks
120 * The returned reference must be put with __end_current_label_crit_section()
121 * This must NOT be used if the task cred could be updated within the
122 * critical section between __begin_current_label_crit_section() ..
123 * __end_current_label_crit_section()
125 static inline struct aa_label *__begin_current_label_crit_section(void)
127 struct aa_label *label = aa_current_raw_label();
129 if (label_is_stale(label))
130 label = aa_get_newest_label(label);
136 * begin_current_label_crit_section - current's confining label and update it
138 * Returns: up to date confining label or the ns unconfined label (NOT NULL)
140 * Not safe to call inside locks
142 * The returned reference must be put with end_current_label_crit_section()
143 * This must NOT be used if the task cred could be updated within the
144 * critical section between begin_current_label_crit_section() ..
145 * end_current_label_crit_section()
147 static inline struct aa_label *begin_current_label_crit_section(void)
149 struct aa_label *label = aa_current_raw_label();
153 if (label_is_stale(label)) {
154 label = aa_get_newest_label(label);
155 if (aa_replace_current_label(label) == 0)
156 /* task cred will keep the reference */
163 static inline struct aa_ns *aa_get_current_ns(void)
165 struct aa_label *label;
168 label = __begin_current_label_crit_section();
169 ns = aa_get_ns(labels_ns(label));
170 __end_current_label_crit_section(label);
175 #endif /* __AA_CONTEXT_H */