| 1 | /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1) |
| 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 <lttng-kernel-version.h> |
| 13 | #include <linux/user_namespace.h> |
| 14 | |
| 15 | |
| 16 | #if LTTNG_LINUX_VERSION_CODE >= LTTNG_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 | |
| 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 | |
| 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())) |
| 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 | |
| 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 */ |