Randy Dunlap | d410fa4 | 2011-05-19 15:59:38 -0700 | [diff] [blame] | 1 | /* Credentials management - see Documentation/security/credentials.txt |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 2 | * |
| 3 | * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _LINUX_CRED_H |
| 13 | #define _LINUX_CRED_H |
| 14 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 15 | #include <linux/capability.h> |
Alexey Dobriyan | b2e1fea | 2009-05-28 14:34:20 -0700 | [diff] [blame] | 16 | #include <linux/init.h> |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 17 | #include <linux/key.h> |
Eric Paris | ed868a5 | 2009-09-12 22:54:10 -0400 | [diff] [blame] | 18 | #include <linux/selinux.h> |
Arun Sharma | 6006349 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 19 | #include <linux/atomic.h> |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 20 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 21 | struct user_struct; |
| 22 | struct cred; |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 23 | struct inode; |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 24 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 25 | /* |
| 26 | * COW Supplementary groups list |
| 27 | */ |
| 28 | #define NGROUPS_SMALL 32 |
| 29 | #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) |
| 30 | |
| 31 | struct group_info { |
| 32 | atomic_t usage; |
| 33 | int ngroups; |
| 34 | int nblocks; |
| 35 | gid_t small_block[NGROUPS_SMALL]; |
| 36 | gid_t *blocks[0]; |
| 37 | }; |
| 38 | |
| 39 | /** |
| 40 | * get_group_info - Get a reference to a group info structure |
| 41 | * @group_info: The group info to reference |
| 42 | * |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 43 | * This gets a reference to a set of supplementary groups. |
| 44 | * |
| 45 | * If the caller is accessing a task's credentials, they must hold the RCU read |
| 46 | * lock when reading. |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 47 | */ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 48 | static inline struct group_info *get_group_info(struct group_info *gi) |
| 49 | { |
| 50 | atomic_inc(&gi->usage); |
| 51 | return gi; |
| 52 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 53 | |
| 54 | /** |
| 55 | * put_group_info - Release a reference to a group info structure |
| 56 | * @group_info: The group info to release |
| 57 | */ |
| 58 | #define put_group_info(group_info) \ |
| 59 | do { \ |
| 60 | if (atomic_dec_and_test(&(group_info)->usage)) \ |
| 61 | groups_free(group_info); \ |
| 62 | } while (0) |
| 63 | |
| 64 | extern struct group_info *groups_alloc(int); |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 65 | extern struct group_info init_groups; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 66 | extern void groups_free(struct group_info *); |
| 67 | extern int set_current_groups(struct group_info *); |
| 68 | extern int set_groups(struct cred *, struct group_info *); |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 69 | extern int groups_search(const struct group_info *, gid_t); |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 70 | |
| 71 | /* access the groups "array" with this macro */ |
| 72 | #define GROUP_AT(gi, i) \ |
| 73 | ((gi)->blocks[(i) / NGROUPS_PER_BLOCK][(i) % NGROUPS_PER_BLOCK]) |
| 74 | |
| 75 | extern int in_group_p(gid_t); |
| 76 | extern int in_egroup_p(gid_t); |
| 77 | |
| 78 | /* |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 79 | * The common credentials for a thread group |
| 80 | * - shared by CLONE_THREAD |
| 81 | */ |
| 82 | #ifdef CONFIG_KEYS |
| 83 | struct thread_group_cred { |
| 84 | atomic_t usage; |
| 85 | pid_t tgid; /* thread group process ID */ |
| 86 | spinlock_t lock; |
Arnd Bergmann | e63ba74 | 2010-02-26 18:01:20 +0100 | [diff] [blame] | 87 | struct key __rcu *session_keyring; /* keyring inherited over fork */ |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 88 | struct key *process_keyring; /* keyring private to this process */ |
| 89 | struct rcu_head rcu; /* RCU deletion hook */ |
| 90 | }; |
| 91 | #endif |
| 92 | |
| 93 | /* |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 94 | * The security context of a task |
| 95 | * |
| 96 | * The parts of the context break down into two categories: |
| 97 | * |
| 98 | * (1) The objective context of a task. These parts are used when some other |
| 99 | * task is attempting to affect this one. |
| 100 | * |
| 101 | * (2) The subjective context. These details are used when the task is acting |
| 102 | * upon another object, be that a file, a task, a key or whatever. |
| 103 | * |
| 104 | * Note that some members of this structure belong to both categories - the |
| 105 | * LSM security pointer for instance. |
| 106 | * |
| 107 | * A task has two security pointers. task->real_cred points to the objective |
| 108 | * context that defines that task's actual details. The objective part of this |
| 109 | * context is used whenever that task is acted upon. |
| 110 | * |
| 111 | * task->cred points to the subjective context that defines the details of how |
| 112 | * that task is going to act upon another object. This may be overridden |
| 113 | * temporarily to point to another security context, but normally points to the |
| 114 | * same context as task->real_cred. |
| 115 | */ |
| 116 | struct cred { |
| 117 | atomic_t usage; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 118 | #ifdef CONFIG_DEBUG_CREDENTIALS |
| 119 | atomic_t subscribers; /* number of processes subscribed */ |
| 120 | void *put_addr; |
| 121 | unsigned magic; |
| 122 | #define CRED_MAGIC 0x43736564 |
| 123 | #define CRED_MAGIC_DEAD 0x44656144 |
| 124 | #endif |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 125 | uid_t uid; /* real UID of the task */ |
| 126 | gid_t gid; /* real GID of the task */ |
| 127 | uid_t suid; /* saved UID of the task */ |
| 128 | gid_t sgid; /* saved GID of the task */ |
| 129 | uid_t euid; /* effective UID of the task */ |
| 130 | gid_t egid; /* effective GID of the task */ |
| 131 | uid_t fsuid; /* UID for VFS ops */ |
| 132 | gid_t fsgid; /* GID for VFS ops */ |
| 133 | unsigned securebits; /* SUID-less security management */ |
| 134 | kernel_cap_t cap_inheritable; /* caps our children can inherit */ |
| 135 | kernel_cap_t cap_permitted; /* caps we're permitted */ |
| 136 | kernel_cap_t cap_effective; /* caps we can actually use */ |
| 137 | kernel_cap_t cap_bset; /* capability bounding set */ |
| 138 | #ifdef CONFIG_KEYS |
| 139 | unsigned char jit_keyring; /* default keyring to attach requested |
| 140 | * keys to */ |
| 141 | struct key *thread_keyring; /* keyring private to this thread */ |
| 142 | struct key *request_key_auth; /* assumed request_key authority */ |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 143 | struct thread_group_cred *tgcred; /* thread-group shared credentials */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 144 | #endif |
| 145 | #ifdef CONFIG_SECURITY |
| 146 | void *security; /* subjective LSM security */ |
| 147 | #endif |
| 148 | struct user_struct *user; /* real user ID subscription */ |
Serge E. Hallyn | 47a150e | 2011-05-13 04:27:54 +0100 | [diff] [blame] | 149 | struct user_namespace *user_ns; /* cached user->user_ns */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 150 | struct group_info *group_info; /* supplementary groups for euid/fsgid */ |
| 151 | struct rcu_head rcu; /* RCU deletion hook */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 152 | }; |
| 153 | |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 154 | extern void __put_cred(struct cred *); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 155 | extern void exit_creds(struct task_struct *); |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 156 | extern int copy_creds(struct task_struct *, unsigned long); |
David Howells | de09a97 | 2010-07-29 12:45:49 +0100 | [diff] [blame] | 157 | extern const struct cred *get_task_cred(struct task_struct *); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 158 | extern struct cred *cred_alloc_blank(void); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 159 | extern struct cred *prepare_creds(void); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 160 | extern struct cred *prepare_exec_creds(void); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 161 | extern int commit_creds(struct cred *); |
| 162 | extern void abort_creds(struct cred *); |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 163 | extern const struct cred *override_creds(const struct cred *); |
| 164 | extern void revert_creds(const struct cred *); |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 165 | extern struct cred *prepare_kernel_cred(struct task_struct *); |
| 166 | extern int change_create_files_as(struct cred *, struct inode *); |
| 167 | extern int set_security_override(struct cred *, u32); |
| 168 | extern int set_security_override_from_ctx(struct cred *, const char *); |
| 169 | extern int set_create_files_as(struct cred *, struct inode *); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 170 | extern void __init cred_init(void); |
| 171 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 172 | /* |
| 173 | * check for validity of credentials |
| 174 | */ |
| 175 | #ifdef CONFIG_DEBUG_CREDENTIALS |
| 176 | extern void __invalid_creds(const struct cred *, const char *, unsigned); |
| 177 | extern void __validate_process_creds(struct task_struct *, |
| 178 | const char *, unsigned); |
| 179 | |
Andrew Morton | 74908a0 | 2009-09-17 17:47:12 -0700 | [diff] [blame] | 180 | extern bool creds_are_invalid(const struct cred *cred); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 181 | |
| 182 | static inline void __validate_creds(const struct cred *cred, |
| 183 | const char *file, unsigned line) |
| 184 | { |
| 185 | if (unlikely(creds_are_invalid(cred))) |
| 186 | __invalid_creds(cred, file, line); |
| 187 | } |
| 188 | |
| 189 | #define validate_creds(cred) \ |
| 190 | do { \ |
| 191 | __validate_creds((cred), __FILE__, __LINE__); \ |
| 192 | } while(0) |
| 193 | |
| 194 | #define validate_process_creds() \ |
| 195 | do { \ |
| 196 | __validate_process_creds(current, __FILE__, __LINE__); \ |
| 197 | } while(0) |
| 198 | |
| 199 | extern void validate_creds_for_do_exit(struct task_struct *); |
| 200 | #else |
| 201 | static inline void validate_creds(const struct cred *cred) |
| 202 | { |
| 203 | } |
| 204 | static inline void validate_creds_for_do_exit(struct task_struct *tsk) |
| 205 | { |
| 206 | } |
| 207 | static inline void validate_process_creds(void) |
| 208 | { |
| 209 | } |
| 210 | #endif |
| 211 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 212 | /** |
| 213 | * get_new_cred - Get a reference on a new set of credentials |
| 214 | * @cred: The new credentials to reference |
| 215 | * |
| 216 | * Get a reference on the specified set of new credentials. The caller must |
| 217 | * release the reference. |
| 218 | */ |
| 219 | static inline struct cred *get_new_cred(struct cred *cred) |
| 220 | { |
| 221 | atomic_inc(&cred->usage); |
| 222 | return cred; |
| 223 | } |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 224 | |
| 225 | /** |
| 226 | * get_cred - Get a reference on a set of credentials |
| 227 | * @cred: The credentials to reference |
| 228 | * |
| 229 | * Get a reference on the specified set of credentials. The caller must |
| 230 | * release the reference. |
David Howells | 98870ab | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 231 | * |
| 232 | * This is used to deal with a committed set of credentials. Although the |
| 233 | * pointer is const, this will temporarily discard the const and increment the |
| 234 | * usage count. The purpose of this is to attempt to catch at compile time the |
| 235 | * accidental alteration of a set of credentials that should be considered |
| 236 | * immutable. |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 237 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 238 | static inline const struct cred *get_cred(const struct cred *cred) |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 239 | { |
Paul Menage | 1c388ad | 2009-07-17 16:16:18 -0700 | [diff] [blame] | 240 | struct cred *nonconst_cred = (struct cred *) cred; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 241 | validate_creds(cred); |
Paul Menage | 1c388ad | 2009-07-17 16:16:18 -0700 | [diff] [blame] | 242 | return get_new_cred(nonconst_cred); |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | /** |
| 246 | * put_cred - Release a reference to a set of credentials |
| 247 | * @cred: The credentials to release |
| 248 | * |
| 249 | * Release a reference to a set of credentials, deleting them when the last ref |
| 250 | * is released. |
David Howells | 98870ab | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 251 | * |
| 252 | * This takes a const pointer to a set of credentials because the credentials |
| 253 | * on task_struct are attached by const pointers to prevent accidental |
| 254 | * alteration of otherwise immutable credential sets. |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 255 | */ |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 256 | static inline void put_cred(const struct cred *_cred) |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 257 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 258 | struct cred *cred = (struct cred *) _cred; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 259 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 260 | validate_creds(cred); |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 261 | if (atomic_dec_and_test(&(cred)->usage)) |
| 262 | __put_cred(cred); |
| 263 | } |
| 264 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 265 | /** |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 266 | * current_cred - Access the current task's subjective credentials |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 267 | * |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 268 | * Access the subjective credentials of the current task. RCU-safe, |
| 269 | * since nobody else can modify it. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 270 | */ |
| 271 | #define current_cred() \ |
David Howells | 27e4e43 | 2011-08-08 15:54:53 +0100 | [diff] [blame] | 272 | rcu_dereference_protected(current->cred, 1) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 273 | |
| 274 | /** |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 275 | * __task_cred - Access a task's objective credentials |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 276 | * @task: The task to query |
| 277 | * |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 278 | * Access the objective credentials of a task. The caller must hold the RCU |
David Howells | 8f92054 | 2010-07-29 12:45:55 +0100 | [diff] [blame] | 279 | * readlock or the task must be dead and unable to change its own credentials. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 280 | * |
David Howells | 8f92054 | 2010-07-29 12:45:55 +0100 | [diff] [blame] | 281 | * The result of this function should not be passed directly to get_cred(); |
| 282 | * rather get_task_cred() should be used instead. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 283 | */ |
David Howells | 8f92054 | 2010-07-29 12:45:55 +0100 | [diff] [blame] | 284 | #define __task_cred(task) \ |
| 285 | ({ \ |
| 286 | const struct task_struct *__t = (task); \ |
| 287 | rcu_dereference_check(__t->real_cred, \ |
David Howells | 8f92054 | 2010-07-29 12:45:55 +0100 | [diff] [blame] | 288 | task_is_dead(__t)); \ |
| 289 | }) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 290 | |
| 291 | /** |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 292 | * get_current_cred - Get the current task's subjective credentials |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 293 | * |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 294 | * Get the subjective credentials of the current task, pinning them so that |
| 295 | * they can't go away. Accessing the current task's credentials directly is |
| 296 | * not permitted. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 297 | */ |
| 298 | #define get_current_cred() \ |
| 299 | (get_cred(current_cred())) |
| 300 | |
| 301 | /** |
| 302 | * get_current_user - Get the current task's user_struct |
| 303 | * |
| 304 | * Get the user record of the current task, pinning it so that it can't go |
| 305 | * away. |
| 306 | */ |
| 307 | #define get_current_user() \ |
| 308 | ({ \ |
| 309 | struct user_struct *__u; \ |
Linus Torvalds | 638a843 | 2011-08-08 11:33:23 -0700 | [diff] [blame] | 310 | const struct cred *__cred; \ |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 311 | __cred = current_cred(); \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 312 | __u = get_uid(__cred->user); \ |
| 313 | __u; \ |
| 314 | }) |
| 315 | |
| 316 | /** |
| 317 | * get_current_groups - Get the current task's supplementary group list |
| 318 | * |
| 319 | * Get the supplementary group list of the current task, pinning it so that it |
| 320 | * can't go away. |
| 321 | */ |
| 322 | #define get_current_groups() \ |
| 323 | ({ \ |
| 324 | struct group_info *__groups; \ |
Linus Torvalds | 638a843 | 2011-08-08 11:33:23 -0700 | [diff] [blame] | 325 | const struct cred *__cred; \ |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 326 | __cred = current_cred(); \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 327 | __groups = get_group_info(__cred->group_info); \ |
| 328 | __groups; \ |
| 329 | }) |
| 330 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 331 | #define task_cred_xxx(task, xxx) \ |
| 332 | ({ \ |
| 333 | __typeof__(((struct cred *)NULL)->xxx) ___val; \ |
| 334 | rcu_read_lock(); \ |
| 335 | ___val = __task_cred((task))->xxx; \ |
| 336 | rcu_read_unlock(); \ |
| 337 | ___val; \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 338 | }) |
| 339 | |
| 340 | #define task_uid(task) (task_cred_xxx((task), uid)) |
| 341 | #define task_euid(task) (task_cred_xxx((task), euid)) |
| 342 | |
| 343 | #define current_cred_xxx(xxx) \ |
| 344 | ({ \ |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 345 | current_cred()->xxx; \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 346 | }) |
| 347 | |
| 348 | #define current_uid() (current_cred_xxx(uid)) |
| 349 | #define current_gid() (current_cred_xxx(gid)) |
| 350 | #define current_euid() (current_cred_xxx(euid)) |
| 351 | #define current_egid() (current_cred_xxx(egid)) |
| 352 | #define current_suid() (current_cred_xxx(suid)) |
| 353 | #define current_sgid() (current_cred_xxx(sgid)) |
| 354 | #define current_fsuid() (current_cred_xxx(fsuid)) |
| 355 | #define current_fsgid() (current_cred_xxx(fsgid)) |
| 356 | #define current_cap() (current_cred_xxx(cap_effective)) |
| 357 | #define current_user() (current_cred_xxx(user)) |
| 358 | #define current_security() (current_cred_xxx(security)) |
| 359 | |
Serge E. Hallyn | 47a150e | 2011-05-13 04:27:54 +0100 | [diff] [blame] | 360 | #ifdef CONFIG_USER_NS |
| 361 | #define current_user_ns() (current_cred_xxx(user_ns)) |
| 362 | #else |
| 363 | extern struct user_namespace init_user_ns; |
| 364 | #define current_user_ns() (&init_user_ns) |
| 365 | #endif |
| 366 | |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 367 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 368 | #define current_uid_gid(_uid, _gid) \ |
| 369 | do { \ |
| 370 | const struct cred *__cred; \ |
| 371 | __cred = current_cred(); \ |
| 372 | *(_uid) = __cred->uid; \ |
| 373 | *(_gid) = __cred->gid; \ |
| 374 | } while(0) |
| 375 | |
| 376 | #define current_euid_egid(_euid, _egid) \ |
| 377 | do { \ |
| 378 | const struct cred *__cred; \ |
| 379 | __cred = current_cred(); \ |
| 380 | *(_euid) = __cred->euid; \ |
| 381 | *(_egid) = __cred->egid; \ |
| 382 | } while(0) |
| 383 | |
| 384 | #define current_fsuid_fsgid(_fsuid, _fsgid) \ |
| 385 | do { \ |
| 386 | const struct cred *__cred; \ |
| 387 | __cred = current_cred(); \ |
| 388 | *(_fsuid) = __cred->fsuid; \ |
| 389 | *(_fsgid) = __cred->fsgid; \ |
| 390 | } while(0) |
| 391 | |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 392 | #endif /* _LINUX_CRED_H */ |