1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#ifndef _SS_CONTEXT_H_
16#define _SS_CONTEXT_H_
17
18#include "ebitmap.h"
19#include "mls_types.h"
20#include "security.h"
21
22
23
24
25
26struct context {
27 u32 user;
28 u32 role;
29 u32 type;
30 u32 len;
31 struct mls_range range;
32 char *str;
33};
34
35static inline void mls_context_init(struct context *c)
36{
37 memset(&c->range, 0, sizeof(c->range));
38}
39
40static inline int mls_context_cpy(struct context *dst, struct context *src)
41{
42 int rc;
43
44 if (!selinux_mls_enabled)
45 return 0;
46
47 dst->range.level[0].sens = src->range.level[0].sens;
48 rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
49 if (rc)
50 goto out;
51
52 dst->range.level[1].sens = src->range.level[1].sens;
53 rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[1].cat);
54 if (rc)
55 ebitmap_destroy(&dst->range.level[0].cat);
56out:
57 return rc;
58}
59
60
61
62
63static inline int mls_context_cpy_low(struct context *dst, struct context *src)
64{
65 int rc;
66
67 if (!selinux_mls_enabled)
68 return 0;
69
70 dst->range.level[0].sens = src->range.level[0].sens;
71 rc = ebitmap_cpy(&dst->range.level[0].cat, &src->range.level[0].cat);
72 if (rc)
73 goto out;
74
75 dst->range.level[1].sens = src->range.level[0].sens;
76 rc = ebitmap_cpy(&dst->range.level[1].cat, &src->range.level[0].cat);
77 if (rc)
78 ebitmap_destroy(&dst->range.level[0].cat);
79out:
80 return rc;
81}
82
83static inline int mls_context_cmp(struct context *c1, struct context *c2)
84{
85 if (!selinux_mls_enabled)
86 return 1;
87
88 return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
89 ebitmap_cmp(&c1->range.level[0].cat, &c2->range.level[0].cat) &&
90 (c1->range.level[1].sens == c2->range.level[1].sens) &&
91 ebitmap_cmp(&c1->range.level[1].cat, &c2->range.level[1].cat));
92}
93
94static inline void mls_context_destroy(struct context *c)
95{
96 if (!selinux_mls_enabled)
97 return;
98
99 ebitmap_destroy(&c->range.level[0].cat);
100 ebitmap_destroy(&c->range.level[1].cat);
101 mls_context_init(c);
102}
103
104static inline void context_init(struct context *c)
105{
106 memset(c, 0, sizeof(*c));
107}
108
109static inline int context_cpy(struct context *dst, struct context *src)
110{
111 int rc;
112
113 dst->user = src->user;
114 dst->role = src->role;
115 dst->type = src->type;
116 if (src->str) {
117 dst->str = kstrdup(src->str, GFP_ATOMIC);
118 if (!dst->str)
119 return -ENOMEM;
120 dst->len = src->len;
121 } else {
122 dst->str = NULL;
123 dst->len = 0;
124 }
125 rc = mls_context_cpy(dst, src);
126 if (rc) {
127 kfree(dst->str);
128 return rc;
129 }
130 return 0;
131}
132
133static inline void context_destroy(struct context *c)
134{
135 c->user = c->role = c->type = 0;
136 kfree(c->str);
137 c->str = NULL;
138 c->len = 0;
139 mls_context_destroy(c);
140}
141
142static inline int context_cmp(struct context *c1, struct context *c2)
143{
144 if (c1->len && c2->len)
145 return (c1->len == c2->len && !strcmp(c1->str, c2->str));
146 if (c1->len || c2->len)
147 return 0;
148 return ((c1->user == c2->user) &&
149 (c1->role == c2->role) &&
150 (c1->type == c2->type) &&
151 mls_context_cmp(c1, c2));
152}
153
154#endif
155
156