projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |