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 | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 19 | #include <linux/atomic.h> |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 20 | #include <linux/uidgid.h> |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 21 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 22 | struct user_struct; |
| 23 | struct cred; |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 24 | struct inode; |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 25 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 26 | /* |
| 27 | * COW Supplementary groups list |
| 28 | */ |
| 29 | #define NGROUPS_SMALL 32 |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 30 | #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(kgid_t))) |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 31 | |
| 32 | struct group_info { |
| 33 | atomic_t usage; |
| 34 | int ngroups; |
| 35 | int nblocks; |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 36 | kgid_t small_block[NGROUPS_SMALL]; |
| 37 | kgid_t *blocks[0]; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | /** |
| 41 | * get_group_info - Get a reference to a group info structure |
| 42 | * @group_info: The group info to reference |
| 43 | * |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 44 | * This gets a reference to a set of supplementary groups. |
| 45 | * |
| 46 | * If the caller is accessing a task's credentials, they must hold the RCU read |
| 47 | * lock when reading. |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 48 | */ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 49 | static inline struct group_info *get_group_info(struct group_info *gi) |
| 50 | { |
| 51 | atomic_inc(&gi->usage); |
| 52 | return gi; |
| 53 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 54 | |
| 55 | /** |
| 56 | * put_group_info - Release a reference to a group info structure |
| 57 | * @group_info: The group info to release |
| 58 | */ |
| 59 | #define put_group_info(group_info) \ |
| 60 | do { \ |
| 61 | if (atomic_dec_and_test(&(group_info)->usage)) \ |
| 62 | groups_free(group_info); \ |
| 63 | } while (0) |
| 64 | |
Serge Hallyn | 18b6e04 | 2008-10-15 16:38:45 -0500 | [diff] [blame] | 65 | extern struct group_info init_groups; |
Iulia Manda | 2813893 | 2015-04-15 16:16:41 -0700 | [diff] [blame] | 66 | #ifdef CONFIG_MULTIUSER |
| 67 | extern struct group_info *groups_alloc(int); |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 68 | extern void groups_free(struct group_info *); |
Iulia Manda | 2813893 | 2015-04-15 16:16:41 -0700 | [diff] [blame] | 69 | |
| 70 | extern int in_group_p(kgid_t); |
| 71 | extern int in_egroup_p(kgid_t); |
| 72 | #else |
| 73 | static inline void groups_free(struct group_info *group_info) |
| 74 | { |
| 75 | } |
| 76 | |
| 77 | static inline int in_group_p(kgid_t grp) |
| 78 | { |
| 79 | return 1; |
| 80 | } |
| 81 | static inline int in_egroup_p(kgid_t grp) |
| 82 | { |
| 83 | return 1; |
| 84 | } |
| 85 | #endif |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 86 | extern int set_current_groups(struct group_info *); |
Wang YanQing | 8f6c5ff | 2014-04-03 14:48:26 -0700 | [diff] [blame] | 87 | extern void set_groups(struct cred *, struct group_info *); |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 88 | extern int groups_search(const struct group_info *, kgid_t); |
Eric W. Biederman | 7ff4d90 | 2014-12-05 17:19:27 -0600 | [diff] [blame] | 89 | extern bool may_setgroups(void); |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 90 | |
| 91 | /* access the groups "array" with this macro */ |
| 92 | #define GROUP_AT(gi, i) \ |
| 93 | ((gi)->blocks[(i) / NGROUPS_PER_BLOCK][(i) % NGROUPS_PER_BLOCK]) |
| 94 | |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 95 | /* |
| 96 | * The security context of a task |
| 97 | * |
| 98 | * The parts of the context break down into two categories: |
| 99 | * |
| 100 | * (1) The objective context of a task. These parts are used when some other |
| 101 | * task is attempting to affect this one. |
| 102 | * |
| 103 | * (2) The subjective context. These details are used when the task is acting |
| 104 | * upon another object, be that a file, a task, a key or whatever. |
| 105 | * |
| 106 | * Note that some members of this structure belong to both categories - the |
| 107 | * LSM security pointer for instance. |
| 108 | * |
| 109 | * A task has two security pointers. task->real_cred points to the objective |
| 110 | * context that defines that task's actual details. The objective part of this |
| 111 | * context is used whenever that task is acted upon. |
| 112 | * |
| 113 | * task->cred points to the subjective context that defines the details of how |
| 114 | * that task is going to act upon another object. This may be overridden |
| 115 | * temporarily to point to another security context, but normally points to the |
| 116 | * same context as task->real_cred. |
| 117 | */ |
| 118 | struct cred { |
| 119 | atomic_t usage; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 120 | #ifdef CONFIG_DEBUG_CREDENTIALS |
| 121 | atomic_t subscribers; /* number of processes subscribed */ |
| 122 | void *put_addr; |
| 123 | unsigned magic; |
| 124 | #define CRED_MAGIC 0x43736564 |
| 125 | #define CRED_MAGIC_DEAD 0x44656144 |
| 126 | #endif |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 127 | kuid_t uid; /* real UID of the task */ |
| 128 | kgid_t gid; /* real GID of the task */ |
| 129 | kuid_t suid; /* saved UID of the task */ |
| 130 | kgid_t sgid; /* saved GID of the task */ |
| 131 | kuid_t euid; /* effective UID of the task */ |
| 132 | kgid_t egid; /* effective GID of the task */ |
| 133 | kuid_t fsuid; /* UID for VFS ops */ |
| 134 | kgid_t fsgid; /* GID for VFS ops */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 135 | unsigned securebits; /* SUID-less security management */ |
| 136 | kernel_cap_t cap_inheritable; /* caps our children can inherit */ |
| 137 | kernel_cap_t cap_permitted; /* caps we're permitted */ |
| 138 | kernel_cap_t cap_effective; /* caps we can actually use */ |
| 139 | kernel_cap_t cap_bset; /* capability bounding set */ |
Andy Lutomirski | 5831905 | 2015-09-04 15:42:45 -0700 | [diff] [blame] | 140 | kernel_cap_t cap_ambient; /* Ambient capability set */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 141 | #ifdef CONFIG_KEYS |
| 142 | unsigned char jit_keyring; /* default keyring to attach requested |
| 143 | * keys to */ |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 144 | struct key __rcu *session_keyring; /* keyring inherited over fork */ |
| 145 | struct key *process_keyring; /* keyring private to this process */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 146 | struct key *thread_keyring; /* keyring private to this thread */ |
| 147 | struct key *request_key_auth; /* assumed request_key authority */ |
| 148 | #endif |
| 149 | #ifdef CONFIG_SECURITY |
| 150 | void *security; /* subjective LSM security */ |
| 151 | #endif |
| 152 | struct user_struct *user; /* real user ID subscription */ |
Eric W. Biederman | 0093ccb | 2011-11-16 21:52:53 -0800 | [diff] [blame] | 153 | struct user_namespace *user_ns; /* user_ns the caps and keyrings are relative to. */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 154 | struct group_info *group_info; /* supplementary groups for euid/fsgid */ |
| 155 | struct rcu_head rcu; /* RCU deletion hook */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 156 | }; |
| 157 | |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 158 | extern void __put_cred(struct cred *); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 159 | extern void exit_creds(struct task_struct *); |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 160 | extern int copy_creds(struct task_struct *, unsigned long); |
David Howells | de09a97 | 2010-07-29 12:45:49 +0100 | [diff] [blame] | 161 | extern const struct cred *get_task_cred(struct task_struct *); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 162 | extern struct cred *cred_alloc_blank(void); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 163 | extern struct cred *prepare_creds(void); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 164 | extern struct cred *prepare_exec_creds(void); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 165 | extern int commit_creds(struct cred *); |
| 166 | extern void abort_creds(struct cred *); |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 167 | extern const struct cred *override_creds(const struct cred *); |
| 168 | extern void revert_creds(const struct cred *); |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 169 | extern struct cred *prepare_kernel_cred(struct task_struct *); |
| 170 | extern int change_create_files_as(struct cred *, struct inode *); |
| 171 | extern int set_security_override(struct cred *, u32); |
| 172 | extern int set_security_override_from_ctx(struct cred *, const char *); |
| 173 | extern int set_create_files_as(struct cred *, struct inode *); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 174 | extern void __init cred_init(void); |
| 175 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 176 | /* |
| 177 | * check for validity of credentials |
| 178 | */ |
| 179 | #ifdef CONFIG_DEBUG_CREDENTIALS |
| 180 | extern void __invalid_creds(const struct cred *, const char *, unsigned); |
| 181 | extern void __validate_process_creds(struct task_struct *, |
| 182 | const char *, unsigned); |
| 183 | |
Andrew Morton | 74908a0 | 2009-09-17 17:47:12 -0700 | [diff] [blame] | 184 | extern bool creds_are_invalid(const struct cred *cred); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 185 | |
| 186 | static inline void __validate_creds(const struct cred *cred, |
| 187 | const char *file, unsigned line) |
| 188 | { |
| 189 | if (unlikely(creds_are_invalid(cred))) |
| 190 | __invalid_creds(cred, file, line); |
| 191 | } |
| 192 | |
| 193 | #define validate_creds(cred) \ |
| 194 | do { \ |
| 195 | __validate_creds((cred), __FILE__, __LINE__); \ |
| 196 | } while(0) |
| 197 | |
| 198 | #define validate_process_creds() \ |
| 199 | do { \ |
| 200 | __validate_process_creds(current, __FILE__, __LINE__); \ |
| 201 | } while(0) |
| 202 | |
| 203 | extern void validate_creds_for_do_exit(struct task_struct *); |
| 204 | #else |
| 205 | static inline void validate_creds(const struct cred *cred) |
| 206 | { |
| 207 | } |
| 208 | static inline void validate_creds_for_do_exit(struct task_struct *tsk) |
| 209 | { |
| 210 | } |
| 211 | static inline void validate_process_creds(void) |
| 212 | { |
| 213 | } |
| 214 | #endif |
| 215 | |
Andy Lutomirski | 5831905 | 2015-09-04 15:42:45 -0700 | [diff] [blame] | 216 | static inline bool cap_ambient_invariant_ok(const struct cred *cred) |
| 217 | { |
| 218 | return cap_issubset(cred->cap_ambient, |
| 219 | cap_intersect(cred->cap_permitted, |
| 220 | cred->cap_inheritable)); |
| 221 | } |
| 222 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 223 | /** |
| 224 | * get_new_cred - Get a reference on a new set of credentials |
| 225 | * @cred: The new credentials to reference |
| 226 | * |
| 227 | * Get a reference on the specified set of new credentials. The caller must |
| 228 | * release the reference. |
| 229 | */ |
| 230 | static inline struct cred *get_new_cred(struct cred *cred) |
| 231 | { |
| 232 | atomic_inc(&cred->usage); |
| 233 | return cred; |
| 234 | } |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 235 | |
| 236 | /** |
| 237 | * get_cred - Get a reference on a set of credentials |
| 238 | * @cred: The credentials to reference |
| 239 | * |
| 240 | * Get a reference on the specified set of credentials. The caller must |
| 241 | * release the reference. |
David Howells | 98870ab | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 242 | * |
| 243 | * This is used to deal with a committed set of credentials. Although the |
| 244 | * pointer is const, this will temporarily discard the const and increment the |
| 245 | * usage count. The purpose of this is to attempt to catch at compile time the |
| 246 | * accidental alteration of a set of credentials that should be considered |
| 247 | * immutable. |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 248 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 249 | static inline const struct cred *get_cred(const struct cred *cred) |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 250 | { |
Paul Menage | 1c388ad | 2009-07-17 16:16:18 -0700 | [diff] [blame] | 251 | struct cred *nonconst_cred = (struct cred *) cred; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 252 | validate_creds(cred); |
Paul Menage | 1c388ad | 2009-07-17 16:16:18 -0700 | [diff] [blame] | 253 | return get_new_cred(nonconst_cred); |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | /** |
| 257 | * put_cred - Release a reference to a set of credentials |
| 258 | * @cred: The credentials to release |
| 259 | * |
| 260 | * Release a reference to a set of credentials, deleting them when the last ref |
| 261 | * is released. |
David Howells | 98870ab | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 262 | * |
| 263 | * This takes a const pointer to a set of credentials because the credentials |
| 264 | * on task_struct are attached by const pointers to prevent accidental |
| 265 | * alteration of otherwise immutable credential sets. |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 266 | */ |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 267 | static inline void put_cred(const struct cred *_cred) |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 268 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 269 | struct cred *cred = (struct cred *) _cred; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 270 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 271 | validate_creds(cred); |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 272 | if (atomic_dec_and_test(&(cred)->usage)) |
| 273 | __put_cred(cred); |
| 274 | } |
| 275 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 276 | /** |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 277 | * current_cred - Access the current task's subjective credentials |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 278 | * |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 279 | * Access the subjective credentials of the current task. RCU-safe, |
| 280 | * since nobody else can modify it. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 281 | */ |
| 282 | #define current_cred() \ |
David Howells | 27e4e43 | 2011-08-08 15:54:53 +0100 | [diff] [blame] | 283 | rcu_dereference_protected(current->cred, 1) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 284 | |
| 285 | /** |
Jeff Layton | ae4b884 | 2014-07-15 12:59:36 -0400 | [diff] [blame] | 286 | * current_real_cred - Access the current task's objective credentials |
| 287 | * |
| 288 | * Access the objective credentials of the current task. RCU-safe, |
| 289 | * since nobody else can modify it. |
| 290 | */ |
| 291 | #define current_real_cred() \ |
| 292 | rcu_dereference_protected(current->real_cred, 1) |
| 293 | |
| 294 | /** |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 295 | * __task_cred - Access a task's objective credentials |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 296 | * @task: The task to query |
| 297 | * |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 298 | * Access the objective credentials of a task. The caller must hold the RCU |
Oleg Nesterov | 43e13cc | 2012-05-31 16:26:16 -0700 | [diff] [blame] | 299 | * readlock. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 300 | * |
David Howells | 8f92054 | 2010-07-29 12:45:55 +0100 | [diff] [blame] | 301 | * The result of this function should not be passed directly to get_cred(); |
| 302 | * rather get_task_cred() should be used instead. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 303 | */ |
Oleg Nesterov | 43e13cc | 2012-05-31 16:26:16 -0700 | [diff] [blame] | 304 | #define __task_cred(task) \ |
| 305 | rcu_dereference((task)->real_cred) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 306 | |
| 307 | /** |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 308 | * get_current_cred - Get the current task's subjective credentials |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 309 | * |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 310 | * Get the subjective credentials of the current task, pinning them so that |
| 311 | * they can't go away. Accessing the current task's credentials directly is |
| 312 | * not permitted. |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 313 | */ |
| 314 | #define get_current_cred() \ |
| 315 | (get_cred(current_cred())) |
| 316 | |
| 317 | /** |
| 318 | * get_current_user - Get the current task's user_struct |
| 319 | * |
| 320 | * Get the user record of the current task, pinning it so that it can't go |
| 321 | * away. |
| 322 | */ |
| 323 | #define get_current_user() \ |
| 324 | ({ \ |
| 325 | struct user_struct *__u; \ |
Linus Torvalds | 638a843 | 2011-08-08 11:33:23 -0700 | [diff] [blame] | 326 | const struct cred *__cred; \ |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 327 | __cred = current_cred(); \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 328 | __u = get_uid(__cred->user); \ |
| 329 | __u; \ |
| 330 | }) |
| 331 | |
| 332 | /** |
| 333 | * get_current_groups - Get the current task's supplementary group list |
| 334 | * |
| 335 | * Get the supplementary group list of the current task, pinning it so that it |
| 336 | * can't go away. |
| 337 | */ |
| 338 | #define get_current_groups() \ |
| 339 | ({ \ |
| 340 | struct group_info *__groups; \ |
Linus Torvalds | 638a843 | 2011-08-08 11:33:23 -0700 | [diff] [blame] | 341 | const struct cred *__cred; \ |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 342 | __cred = current_cred(); \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 343 | __groups = get_group_info(__cred->group_info); \ |
| 344 | __groups; \ |
| 345 | }) |
| 346 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 347 | #define task_cred_xxx(task, xxx) \ |
| 348 | ({ \ |
| 349 | __typeof__(((struct cred *)NULL)->xxx) ___val; \ |
| 350 | rcu_read_lock(); \ |
| 351 | ___val = __task_cred((task))->xxx; \ |
| 352 | rcu_read_unlock(); \ |
| 353 | ___val; \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 354 | }) |
| 355 | |
| 356 | #define task_uid(task) (task_cred_xxx((task), uid)) |
| 357 | #define task_euid(task) (task_cred_xxx((task), euid)) |
| 358 | |
| 359 | #define current_cred_xxx(xxx) \ |
| 360 | ({ \ |
Al Viro | 3295514 | 2011-08-07 18:55:11 +0100 | [diff] [blame] | 361 | current_cred()->xxx; \ |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 362 | }) |
| 363 | |
| 364 | #define current_uid() (current_cred_xxx(uid)) |
| 365 | #define current_gid() (current_cred_xxx(gid)) |
| 366 | #define current_euid() (current_cred_xxx(euid)) |
| 367 | #define current_egid() (current_cred_xxx(egid)) |
| 368 | #define current_suid() (current_cred_xxx(suid)) |
| 369 | #define current_sgid() (current_cred_xxx(sgid)) |
| 370 | #define current_fsuid() (current_cred_xxx(fsuid)) |
| 371 | #define current_fsgid() (current_cred_xxx(fsgid)) |
| 372 | #define current_cap() (current_cred_xxx(cap_effective)) |
| 373 | #define current_user() (current_cred_xxx(user)) |
| 374 | #define current_security() (current_cred_xxx(security)) |
| 375 | |
Eric W. Biederman | 7e6bd8f | 2011-11-14 19:29:17 -0800 | [diff] [blame] | 376 | extern struct user_namespace init_user_ns; |
Serge E. Hallyn | 47a150e | 2011-05-13 04:27:54 +0100 | [diff] [blame] | 377 | #ifdef CONFIG_USER_NS |
Eric Paris | f1c84da | 2012-01-03 12:25:15 -0500 | [diff] [blame] | 378 | #define current_user_ns() (current_cred_xxx(user_ns)) |
Serge E. Hallyn | 47a150e | 2011-05-13 04:27:54 +0100 | [diff] [blame] | 379 | #else |
Eric Paris | f1c84da | 2012-01-03 12:25:15 -0500 | [diff] [blame] | 380 | #define current_user_ns() (&init_user_ns) |
Serge E. Hallyn | 47a150e | 2011-05-13 04:27:54 +0100 | [diff] [blame] | 381 | #endif |
| 382 | |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 383 | |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 384 | #define current_uid_gid(_uid, _gid) \ |
| 385 | do { \ |
| 386 | const struct cred *__cred; \ |
| 387 | __cred = current_cred(); \ |
| 388 | *(_uid) = __cred->uid; \ |
| 389 | *(_gid) = __cred->gid; \ |
| 390 | } while(0) |
| 391 | |
| 392 | #define current_euid_egid(_euid, _egid) \ |
| 393 | do { \ |
| 394 | const struct cred *__cred; \ |
| 395 | __cred = current_cred(); \ |
| 396 | *(_euid) = __cred->euid; \ |
| 397 | *(_egid) = __cred->egid; \ |
| 398 | } while(0) |
| 399 | |
| 400 | #define current_fsuid_fsgid(_fsuid, _fsgid) \ |
| 401 | do { \ |
| 402 | const struct cred *__cred; \ |
| 403 | __cred = current_cred(); \ |
| 404 | *(_fsuid) = __cred->fsuid; \ |
| 405 | *(_fsgid) = __cred->fsgid; \ |
| 406 | } while(0) |
| 407 | |
David Howells | 9e2b2dc | 2008-08-13 16:20:04 +0100 | [diff] [blame] | 408 | #endif /* _LINUX_CRED_H */ |