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13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/gfp.h>
16#include <linux/idr.h>
17#include <linux/slab.h>
18#include <linux/spinlock.h>
19
20#include "include/cred.h"
21#include "include/lib.h"
22#include "include/secid.h"
23#include "include/label.h"
24#include "include/policy_ns.h"
25
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28
29
30#define AA_FIRST_SECID 2
31
32static DEFINE_IDR(aa_secids);
33static DEFINE_SPINLOCK(secid_lock);
34
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44
45
46void aa_secid_update(u32 secid, struct aa_label *label)
47{
48 unsigned long flags;
49
50 spin_lock_irqsave(&secid_lock, flags);
51 idr_replace(&aa_secids, label, secid);
52 spin_unlock_irqrestore(&secid_lock, flags);
53}
54
55
56
57
58
59struct aa_label *aa_secid_to_label(u32 secid)
60{
61 struct aa_label *label;
62
63 rcu_read_lock();
64 label = idr_find(&aa_secids, secid);
65 rcu_read_unlock();
66
67 return label;
68}
69
70int apparmor_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
71{
72
73 struct aa_label *label = aa_secid_to_label(secid);
74 int len;
75
76 AA_BUG(!seclen);
77
78 if (!label)
79 return -EINVAL;
80
81 if (secdata)
82 len = aa_label_asxprint(secdata, root_ns, label,
83 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
84 FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT,
85 GFP_ATOMIC);
86 else
87 len = aa_label_snxprint(NULL, 0, root_ns, label,
88 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
89 FLAG_HIDDEN_UNCONFINED | FLAG_ABS_ROOT);
90 if (len < 0)
91 return -ENOMEM;
92
93 *seclen = len;
94
95 return 0;
96}
97
98int apparmor_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
99{
100 struct aa_label *label;
101
102 label = aa_label_strn_parse(&root_ns->unconfined->label, secdata,
103 seclen, GFP_KERNEL, false, false);
104 if (IS_ERR(label))
105 return PTR_ERR(label);
106 *secid = label->secid;
107
108 return 0;
109}
110
111void apparmor_release_secctx(char *secdata, u32 seclen)
112{
113 kfree(secdata);
114}
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123
124int aa_alloc_secid(struct aa_label *label, gfp_t gfp)
125{
126 unsigned long flags;
127 int ret;
128
129 idr_preload(gfp);
130 spin_lock_irqsave(&secid_lock, flags);
131 ret = idr_alloc(&aa_secids, label, AA_FIRST_SECID, 0, GFP_ATOMIC);
132 spin_unlock_irqrestore(&secid_lock, flags);
133 idr_preload_end();
134
135 if (ret < 0) {
136 label->secid = AA_SECID_INVALID;
137 return ret;
138 }
139
140 AA_BUG(ret == AA_SECID_INVALID);
141 label->secid = ret;
142 return 0;
143}
144
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148
149void aa_free_secid(u32 secid)
150{
151 unsigned long flags;
152
153 spin_lock_irqsave(&secid_lock, flags);
154 idr_remove(&aa_secids, secid);
155 spin_unlock_irqrestore(&secid_lock, flags);
156}
157
158void aa_secids_init(void)
159{
160 idr_init_base(&aa_secids, AA_FIRST_SECID);
161}
162