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b7cdc182 | 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
dc923e75 MJ |
2 | * |
3 | * wrapper/user_namespace.h | |
4 | * | |
5 | * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com> | |
6 | * | |
7 | */ | |
8 | ||
9 | #ifndef _LTTNG_WRAPPER_USER_NAMESPACE_H | |
10 | #define _LTTNG_WRAPPER_USER_NAMESPACE_H | |
11 | ||
12 | #include <linux/version.h> | |
13 | #include <linux/user_namespace.h> | |
14 | ||
15 | ||
16 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
17 | ||
18 | #define lttng_current_xxuid(xxx) \ | |
19 | (from_kuid_munged(&init_user_ns, current_##xxx())) | |
20 | ||
21 | #define lttng_current_vxxuid(xxx) \ | |
22 | (from_kuid_munged(current_user_ns(), current_##xxx())) | |
23 | ||
24 | #define lttng_current_xxgid(xxx) \ | |
25 | (from_kgid_munged(&init_user_ns, current_##xxx())) | |
26 | ||
27 | #define lttng_current_vxxgid(xxx) \ | |
28 | (from_kgid_munged(current_user_ns(), current_##xxx())) | |
29 | ||
1965e6b4 MJ |
30 | static inline |
31 | uid_t lttng_task_vuid(struct task_struct *p, struct user_namespace *ns) | |
32 | { | |
33 | uid_t uid; | |
34 | kuid_t kuid; | |
35 | ||
36 | kuid = task_cred_xxx(p, uid); | |
37 | uid = from_kuid_munged(ns, kuid); | |
38 | ||
39 | return uid; | |
40 | } | |
41 | ||
42 | static inline | |
43 | gid_t lttng_task_vgid(struct task_struct *p, struct user_namespace *ns) | |
44 | { | |
45 | gid_t gid; | |
46 | kgid_t kgid; | |
47 | ||
48 | kgid = task_cred_xxx(p, gid); | |
49 | gid = from_kgid_munged(ns, kgid); | |
50 | ||
51 | return gid; | |
52 | } | |
53 | ||
dc923e75 MJ |
54 | #else |
55 | ||
56 | #define lttng_current_xxuid(xxx) (current_##xxx()) | |
57 | ||
58 | #define lttng_current_vxxuid(xxx) \ | |
59 | (user_ns_map_uid(current_user_ns(), current_cred(), current_##xxx())) | |
60 | ||
61 | #define lttng_current_xxgid(xxx) (current_##xxx()) | |
62 | ||
63 | #define lttng_current_vxxgid(xxx) \ | |
64 | (user_ns_map_gid(current_user_ns(), current_cred(), current_##xxx())) | |
1965e6b4 MJ |
65 | |
66 | static inline | |
67 | uid_t lttng_task_vuid(struct task_struct *p, struct user_namespace *ns) | |
68 | { | |
69 | uid_t uid; | |
70 | ||
71 | /* | |
72 | * __task_cred requires the RCU readlock be held | |
73 | */ | |
74 | rcu_read_lock(); | |
75 | uid = user_ns_map_uid(ns, __task_cred(p), __task_cred(p)->uid); | |
76 | rcu_read_unlock(); | |
77 | ||
78 | return uid; | |
79 | } | |
80 | ||
81 | static inline | |
82 | gid_t lttng_task_vgid(struct task_struct *p, struct user_namespace *ns) | |
83 | { | |
84 | gid_t gid; | |
85 | ||
86 | /* | |
87 | * __task_cred requires the RCU readlock be held | |
88 | */ | |
89 | rcu_read_lock(); | |
90 | gid = user_ns_map_gid(ns, __task_cred(p), __task_cred(p)->gid); | |
91 | rcu_read_unlock(); | |
92 | ||
93 | return gid; | |
94 | } | |
95 | ||
dc923e75 MJ |
96 | #endif |
97 | ||
98 | #define lttng_current_uid() (lttng_current_xxuid(uid)) | |
99 | #define lttng_current_euid() (lttng_current_xxuid(euid)) | |
100 | #define lttng_current_suid() (lttng_current_xxuid(suid)) | |
101 | #define lttng_current_fsuid() (lttng_current_xxuid(fsuid)) | |
102 | #define lttng_current_gid() (lttng_current_xxgid(gid)) | |
103 | #define lttng_current_egid() (lttng_current_xxgid(egid)) | |
104 | #define lttng_current_sgid() (lttng_current_xxgid(sgid)) | |
105 | #define lttng_current_fsgid() (lttng_current_xxgid(fsgid)) | |
106 | ||
107 | #define lttng_current_vuid() (lttng_current_vxxuid(uid)) | |
108 | #define lttng_current_veuid() (lttng_current_vxxuid(euid)) | |
109 | #define lttng_current_vsuid() (lttng_current_vxxuid(suid)) | |
110 | #define lttng_current_vfsuid() (lttng_current_vxxuid(fsuid)) | |
111 | #define lttng_current_vgid() (lttng_current_vxxgid(gid)) | |
112 | #define lttng_current_vegid() (lttng_current_vxxgid(egid)) | |
113 | #define lttng_current_vsgid() (lttng_current_vxxgid(sgid)) | |
114 | #define lttng_current_vfsgid() (lttng_current_vxxgid(fsgid)) | |
115 | ||
116 | #endif /* _LTTNG_WRAPPER_USER_NAMESPACE_H */ |