Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* process_keys.c: management of a process's keyrings |
| 2 | * |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/keyctl.h> |
| 17 | #include <linux/fs.h> |
| 18 | #include <linux/err.h> |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 19 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/uaccess.h> |
| 21 | #include "internal.h" |
| 22 | |
| 23 | /* session keyring create vs join semaphore */ |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 24 | static DEFINE_MUTEX(key_session_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | /* the root user's tracking struct */ |
| 27 | struct key_user root_key_user = { |
| 28 | .usage = ATOMIC_INIT(3), |
| 29 | .consq = LIST_HEAD_INIT(root_key_user.consq), |
| 30 | .lock = SPIN_LOCK_UNLOCKED, |
| 31 | .nkeys = ATOMIC_INIT(2), |
| 32 | .nikeys = ATOMIC_INIT(2), |
| 33 | .uid = 0, |
| 34 | }; |
| 35 | |
| 36 | /* the root user's UID keyring */ |
| 37 | struct key root_user_keyring = { |
| 38 | .usage = ATOMIC_INIT(1), |
| 39 | .serial = 2, |
| 40 | .type = &key_type_keyring, |
| 41 | .user = &root_key_user, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | .sem = __RWSEM_INITIALIZER(root_user_keyring.sem), |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 43 | .perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL, |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 44 | .flags = 1 << KEY_FLAG_INSTANTIATED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | .description = "_uid.0", |
| 46 | #ifdef KEY_DEBUGGING |
| 47 | .magic = KEY_DEBUG_MAGIC, |
| 48 | #endif |
| 49 | }; |
| 50 | |
| 51 | /* the root user's default session keyring */ |
| 52 | struct key root_session_keyring = { |
| 53 | .usage = ATOMIC_INIT(1), |
| 54 | .serial = 1, |
| 55 | .type = &key_type_keyring, |
| 56 | .user = &root_key_user, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | .sem = __RWSEM_INITIALIZER(root_session_keyring.sem), |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 58 | .perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL, |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 59 | .flags = 1 << KEY_FLAG_INSTANTIATED, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | .description = "_uid_ses.0", |
| 61 | #ifdef KEY_DEBUGGING |
| 62 | .magic = KEY_DEBUG_MAGIC, |
| 63 | #endif |
| 64 | }; |
| 65 | |
| 66 | /*****************************************************************************/ |
| 67 | /* |
| 68 | * allocate the keyrings to be associated with a UID |
| 69 | */ |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 70 | int alloc_uid_keyring(struct user_struct *user, |
| 71 | struct task_struct *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
| 73 | struct key *uid_keyring, *session_keyring; |
| 74 | char buf[20]; |
| 75 | int ret; |
| 76 | |
| 77 | /* concoct a default session keyring */ |
| 78 | sprintf(buf, "_uid_ses.%u", user->uid); |
| 79 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 80 | session_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | if (IS_ERR(session_keyring)) { |
| 82 | ret = PTR_ERR(session_keyring); |
| 83 | goto error; |
| 84 | } |
| 85 | |
| 86 | /* and a UID specific keyring, pointed to by the default session |
| 87 | * keyring */ |
| 88 | sprintf(buf, "_uid.%u", user->uid); |
| 89 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 90 | uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | session_keyring); |
| 92 | if (IS_ERR(uid_keyring)) { |
| 93 | key_put(session_keyring); |
| 94 | ret = PTR_ERR(uid_keyring); |
| 95 | goto error; |
| 96 | } |
| 97 | |
| 98 | /* install the keyrings */ |
| 99 | user->uid_keyring = uid_keyring; |
| 100 | user->session_keyring = session_keyring; |
| 101 | ret = 0; |
| 102 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 103 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return ret; |
| 105 | |
| 106 | } /* end alloc_uid_keyring() */ |
| 107 | |
| 108 | /*****************************************************************************/ |
| 109 | /* |
| 110 | * deal with the UID changing |
| 111 | */ |
| 112 | void switch_uid_keyring(struct user_struct *new_user) |
| 113 | { |
| 114 | #if 0 /* do nothing for now */ |
| 115 | struct key *old; |
| 116 | |
| 117 | /* switch to the new user's session keyring if we were running under |
| 118 | * root's default session keyring */ |
| 119 | if (new_user->uid != 0 && |
| 120 | current->session_keyring == &root_session_keyring |
| 121 | ) { |
| 122 | atomic_inc(&new_user->session_keyring->usage); |
| 123 | |
| 124 | task_lock(current); |
| 125 | old = current->session_keyring; |
| 126 | current->session_keyring = new_user->session_keyring; |
| 127 | task_unlock(current); |
| 128 | |
| 129 | key_put(old); |
| 130 | } |
| 131 | #endif |
| 132 | |
| 133 | } /* end switch_uid_keyring() */ |
| 134 | |
| 135 | /*****************************************************************************/ |
| 136 | /* |
| 137 | * install a fresh thread keyring, discarding the old one |
| 138 | */ |
| 139 | int install_thread_keyring(struct task_struct *tsk) |
| 140 | { |
| 141 | struct key *keyring, *old; |
| 142 | char buf[20]; |
| 143 | int ret; |
| 144 | |
| 145 | sprintf(buf, "_tid.%u", tsk->pid); |
| 146 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 147 | keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | if (IS_ERR(keyring)) { |
| 149 | ret = PTR_ERR(keyring); |
| 150 | goto error; |
| 151 | } |
| 152 | |
| 153 | task_lock(tsk); |
| 154 | old = tsk->thread_keyring; |
| 155 | tsk->thread_keyring = keyring; |
| 156 | task_unlock(tsk); |
| 157 | |
| 158 | ret = 0; |
| 159 | |
| 160 | key_put(old); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 161 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | return ret; |
| 163 | |
| 164 | } /* end install_thread_keyring() */ |
| 165 | |
| 166 | /*****************************************************************************/ |
| 167 | /* |
| 168 | * make sure a process keyring is installed |
| 169 | */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 170 | int install_process_keyring(struct task_struct *tsk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | struct key *keyring; |
| 173 | char buf[20]; |
| 174 | int ret; |
| 175 | |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 176 | might_sleep(); |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | if (!tsk->signal->process_keyring) { |
| 179 | sprintf(buf, "_pid.%u", tsk->tgid); |
| 180 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 181 | keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (IS_ERR(keyring)) { |
| 183 | ret = PTR_ERR(keyring); |
| 184 | goto error; |
| 185 | } |
| 186 | |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 187 | /* attach keyring */ |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 188 | spin_lock_irq(&tsk->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | if (!tsk->signal->process_keyring) { |
| 190 | tsk->signal->process_keyring = keyring; |
| 191 | keyring = NULL; |
| 192 | } |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 193 | spin_unlock_irq(&tsk->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | key_put(keyring); |
| 196 | } |
| 197 | |
| 198 | ret = 0; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 199 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | return ret; |
| 201 | |
| 202 | } /* end install_process_keyring() */ |
| 203 | |
| 204 | /*****************************************************************************/ |
| 205 | /* |
| 206 | * install a session keyring, discarding the old one |
| 207 | * - if a keyring is not supplied, an empty one is invented |
| 208 | */ |
| 209 | static int install_session_keyring(struct task_struct *tsk, |
| 210 | struct key *keyring) |
| 211 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | struct key *old; |
| 213 | char buf[20]; |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 214 | |
| 215 | might_sleep(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
| 217 | /* create an empty session keyring */ |
| 218 | if (!keyring) { |
| 219 | sprintf(buf, "_ses.%u", tsk->tgid); |
| 220 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 221 | keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL); |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 222 | if (IS_ERR(keyring)) |
| 223 | return PTR_ERR(keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | else { |
| 226 | atomic_inc(&keyring->usage); |
| 227 | } |
| 228 | |
| 229 | /* install the keyring */ |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 230 | spin_lock_irq(&tsk->sighand->siglock); |
| 231 | old = tsk->signal->session_keyring; |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 232 | rcu_assign_pointer(tsk->signal->session_keyring, keyring); |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 233 | spin_unlock_irq(&tsk->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 235 | /* we're using RCU on the pointer, but there's no point synchronising |
| 236 | * on it if it didn't previously point to anything */ |
| 237 | if (old) { |
| 238 | synchronize_rcu(); |
| 239 | key_put(old); |
| 240 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 242 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | } /* end install_session_keyring() */ |
| 245 | |
| 246 | /*****************************************************************************/ |
| 247 | /* |
| 248 | * copy the keys in a thread group for fork without CLONE_THREAD |
| 249 | */ |
| 250 | int copy_thread_group_keys(struct task_struct *tsk) |
| 251 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | key_check(current->thread_group->session_keyring); |
| 253 | key_check(current->thread_group->process_keyring); |
| 254 | |
| 255 | /* no process keyring yet */ |
| 256 | tsk->signal->process_keyring = NULL; |
| 257 | |
| 258 | /* same session keyring */ |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 259 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | tsk->signal->session_keyring = |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 261 | key_get(rcu_dereference(current->signal->session_keyring)); |
| 262 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | return 0; |
| 265 | |
| 266 | } /* end copy_thread_group_keys() */ |
| 267 | |
| 268 | /*****************************************************************************/ |
| 269 | /* |
| 270 | * copy the keys for fork |
| 271 | */ |
| 272 | int copy_keys(unsigned long clone_flags, struct task_struct *tsk) |
| 273 | { |
| 274 | key_check(tsk->thread_keyring); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 275 | key_check(tsk->request_key_auth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | /* no thread keyring yet */ |
| 278 | tsk->thread_keyring = NULL; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 279 | |
| 280 | /* copy the request_key() authorisation for this thread */ |
| 281 | key_get(tsk->request_key_auth); |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | return 0; |
| 284 | |
| 285 | } /* end copy_keys() */ |
| 286 | |
| 287 | /*****************************************************************************/ |
| 288 | /* |
| 289 | * dispose of thread group keys upon thread group destruction |
| 290 | */ |
| 291 | void exit_thread_group_keys(struct signal_struct *tg) |
| 292 | { |
| 293 | key_put(tg->session_keyring); |
| 294 | key_put(tg->process_keyring); |
| 295 | |
| 296 | } /* end exit_thread_group_keys() */ |
| 297 | |
| 298 | /*****************************************************************************/ |
| 299 | /* |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 300 | * dispose of per-thread keys upon thread exit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | */ |
| 302 | void exit_keys(struct task_struct *tsk) |
| 303 | { |
| 304 | key_put(tsk->thread_keyring); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 305 | key_put(tsk->request_key_auth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
| 307 | } /* end exit_keys() */ |
| 308 | |
| 309 | /*****************************************************************************/ |
| 310 | /* |
| 311 | * deal with execve() |
| 312 | */ |
| 313 | int exec_keys(struct task_struct *tsk) |
| 314 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | struct key *old; |
| 316 | |
| 317 | /* newly exec'd tasks don't get a thread keyring */ |
| 318 | task_lock(tsk); |
| 319 | old = tsk->thread_keyring; |
| 320 | tsk->thread_keyring = NULL; |
| 321 | task_unlock(tsk); |
| 322 | |
| 323 | key_put(old); |
| 324 | |
| 325 | /* discard the process keyring from a newly exec'd task */ |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 326 | spin_lock_irq(&tsk->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | old = tsk->signal->process_keyring; |
| 328 | tsk->signal->process_keyring = NULL; |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 329 | spin_unlock_irq(&tsk->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | key_put(old); |
| 332 | |
| 333 | return 0; |
| 334 | |
| 335 | } /* end exec_keys() */ |
| 336 | |
| 337 | /*****************************************************************************/ |
| 338 | /* |
| 339 | * deal with SUID programs |
| 340 | * - we might want to make this invent a new session keyring |
| 341 | */ |
| 342 | int suid_keys(struct task_struct *tsk) |
| 343 | { |
| 344 | return 0; |
| 345 | |
| 346 | } /* end suid_keys() */ |
| 347 | |
| 348 | /*****************************************************************************/ |
| 349 | /* |
| 350 | * the filesystem user ID changed |
| 351 | */ |
| 352 | void key_fsuid_changed(struct task_struct *tsk) |
| 353 | { |
| 354 | /* update the ownership of the thread keyring */ |
| 355 | if (tsk->thread_keyring) { |
| 356 | down_write(&tsk->thread_keyring->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | tsk->thread_keyring->uid = tsk->fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | up_write(&tsk->thread_keyring->sem); |
| 359 | } |
| 360 | |
| 361 | } /* end key_fsuid_changed() */ |
| 362 | |
| 363 | /*****************************************************************************/ |
| 364 | /* |
| 365 | * the filesystem group ID changed |
| 366 | */ |
| 367 | void key_fsgid_changed(struct task_struct *tsk) |
| 368 | { |
| 369 | /* update the ownership of the thread keyring */ |
| 370 | if (tsk->thread_keyring) { |
| 371 | down_write(&tsk->thread_keyring->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | tsk->thread_keyring->gid = tsk->fsgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | up_write(&tsk->thread_keyring->sem); |
| 374 | } |
| 375 | |
| 376 | } /* end key_fsgid_changed() */ |
| 377 | |
| 378 | /*****************************************************************************/ |
| 379 | /* |
| 380 | * search the process keyrings for the first matching key |
| 381 | * - we use the supplied match function to see if the description (or other |
| 382 | * feature of interest) matches |
| 383 | * - we return -EAGAIN if we didn't find any matching key |
| 384 | * - we return -ENOKEY if we found only negative matching keys |
| 385 | */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 386 | key_ref_t search_process_keyrings(struct key_type *type, |
| 387 | const void *description, |
| 388 | key_match_func_t match, |
| 389 | struct task_struct *context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 391 | struct request_key_auth *rka; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 392 | key_ref_t key_ref, ret, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 394 | might_sleep(); |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | /* we want to return -EAGAIN or -ENOKEY if any of the keyrings were |
| 397 | * searchable, but we failed to find a key or we found a negative key; |
| 398 | * otherwise we want to return a sample error (probably -EACCES) if |
| 399 | * none of the keyrings were searchable |
| 400 | * |
| 401 | * in terms of priority: success > -ENOKEY > -EAGAIN > other error |
| 402 | */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 403 | key_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | ret = NULL; |
| 405 | err = ERR_PTR(-EAGAIN); |
| 406 | |
| 407 | /* search the thread keyring first */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 408 | if (context->thread_keyring) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 409 | key_ref = keyring_search_aux( |
| 410 | make_key_ref(context->thread_keyring, 1), |
| 411 | context, type, description, match); |
| 412 | if (!IS_ERR(key_ref)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | goto found; |
| 414 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 415 | switch (PTR_ERR(key_ref)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | case -EAGAIN: /* no key */ |
| 417 | if (ret) |
| 418 | break; |
| 419 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 420 | ret = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | break; |
| 422 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 423 | err = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | break; |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | /* search the process keyring second */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 429 | if (context->signal->process_keyring) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 430 | key_ref = keyring_search_aux( |
| 431 | make_key_ref(context->signal->process_keyring, 1), |
| 432 | context, type, description, match); |
| 433 | if (!IS_ERR(key_ref)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | goto found; |
| 435 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 436 | switch (PTR_ERR(key_ref)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | case -EAGAIN: /* no key */ |
| 438 | if (ret) |
| 439 | break; |
| 440 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 441 | ret = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | break; |
| 443 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 444 | err = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | break; |
| 446 | } |
| 447 | } |
| 448 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 449 | /* search the session keyring */ |
| 450 | if (context->signal->session_keyring) { |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 451 | rcu_read_lock(); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 452 | key_ref = keyring_search_aux( |
| 453 | make_key_ref(rcu_dereference( |
| 454 | context->signal->session_keyring), |
| 455 | 1), |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 456 | context, type, description, match); |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 457 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 459 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 460 | goto found; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 462 | switch (PTR_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 463 | case -EAGAIN: /* no key */ |
| 464 | if (ret) |
| 465 | break; |
| 466 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 467 | ret = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | break; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 469 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 470 | err = key_ref; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 471 | break; |
| 472 | } |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 473 | } |
| 474 | /* or search the user-session keyring */ |
| 475 | else { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 476 | key_ref = keyring_search_aux( |
| 477 | make_key_ref(context->user->session_keyring, 1), |
| 478 | context, type, description, match); |
| 479 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 480 | goto found; |
| 481 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 482 | switch (PTR_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 483 | case -EAGAIN: /* no key */ |
| 484 | if (ret) |
| 485 | break; |
| 486 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 487 | ret = key_ref; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 488 | break; |
| 489 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 490 | err = key_ref; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 491 | break; |
| 492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
| 494 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 495 | /* if this process has an instantiation authorisation key, then we also |
| 496 | * search the keyrings of the process mentioned there |
| 497 | * - we don't permit access to request_key auth keys via this method |
| 498 | */ |
| 499 | if (context->request_key_auth && |
| 500 | context == current && |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 501 | type != &key_type_request_key_auth |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 502 | ) { |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 503 | /* defend against the auth key being revoked */ |
| 504 | down_read(&context->request_key_auth->sem); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 505 | |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 506 | if (key_validate(context->request_key_auth) == 0) { |
| 507 | rka = context->request_key_auth->payload.data; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 508 | |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 509 | key_ref = search_process_keyrings(type, description, |
| 510 | match, rka->context); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 511 | |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 512 | up_read(&context->request_key_auth->sem); |
| 513 | |
| 514 | if (!IS_ERR(key_ref)) |
| 515 | goto found; |
| 516 | |
| 517 | switch (PTR_ERR(key_ref)) { |
| 518 | case -EAGAIN: /* no key */ |
| 519 | if (ret) |
| 520 | break; |
| 521 | case -ENOKEY: /* negative key */ |
| 522 | ret = key_ref; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 523 | break; |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 524 | default: |
| 525 | err = key_ref; |
| 526 | break; |
| 527 | } |
| 528 | } else { |
| 529 | up_read(&context->request_key_auth->sem); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 530 | } |
| 531 | } |
| 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | /* no key - decide on the error we're going to go for */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 534 | key_ref = ret ? ret : err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 536 | found: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 537 | return key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | } /* end search_process_keyrings() */ |
| 540 | |
| 541 | /*****************************************************************************/ |
| 542 | /* |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 543 | * see if the key we're looking at is the target key |
| 544 | */ |
| 545 | static int lookup_user_key_possessed(const struct key *key, const void *target) |
| 546 | { |
| 547 | return key == target; |
| 548 | |
| 549 | } /* end lookup_user_key_possessed() */ |
| 550 | |
| 551 | /*****************************************************************************/ |
| 552 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | * lookup a key given a key ID from userspace with a given permissions mask |
| 554 | * - don't create special keyrings unless so requested |
| 555 | * - partially constructed keys aren't found unless requested |
| 556 | */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 557 | key_ref_t lookup_user_key(struct task_struct *context, key_serial_t id, |
| 558 | int create, int partial, key_perm_t perm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 560 | key_ref_t key_ref, skey_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | struct key *key; |
| 562 | int ret; |
| 563 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 564 | if (!context) |
| 565 | context = current; |
| 566 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 567 | key_ref = ERR_PTR(-ENOKEY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
| 569 | switch (id) { |
| 570 | case KEY_SPEC_THREAD_KEYRING: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 571 | if (!context->thread_keyring) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (!create) |
| 573 | goto error; |
| 574 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 575 | ret = install_thread_keyring(context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | if (ret < 0) { |
| 577 | key = ERR_PTR(ret); |
| 578 | goto error; |
| 579 | } |
| 580 | } |
| 581 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 582 | key = context->thread_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | atomic_inc(&key->usage); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 584 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | break; |
| 586 | |
| 587 | case KEY_SPEC_PROCESS_KEYRING: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 588 | if (!context->signal->process_keyring) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | if (!create) |
| 590 | goto error; |
| 591 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 592 | ret = install_process_keyring(context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | if (ret < 0) { |
| 594 | key = ERR_PTR(ret); |
| 595 | goto error; |
| 596 | } |
| 597 | } |
| 598 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 599 | key = context->signal->process_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | atomic_inc(&key->usage); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 601 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | break; |
| 603 | |
| 604 | case KEY_SPEC_SESSION_KEYRING: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 605 | if (!context->signal->session_keyring) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | /* always install a session keyring upon access if one |
| 607 | * doesn't exist yet */ |
| 608 | ret = install_session_keyring( |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 609 | context, context->user->session_keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | if (ret < 0) |
| 611 | goto error; |
| 612 | } |
| 613 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 614 | rcu_read_lock(); |
| 615 | key = rcu_dereference(context->signal->session_keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | atomic_inc(&key->usage); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 617 | rcu_read_unlock(); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 618 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | break; |
| 620 | |
| 621 | case KEY_SPEC_USER_KEYRING: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 622 | key = context->user->uid_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | atomic_inc(&key->usage); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 624 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | break; |
| 626 | |
| 627 | case KEY_SPEC_USER_SESSION_KEYRING: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 628 | key = context->user->session_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | atomic_inc(&key->usage); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 630 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | break; |
| 632 | |
| 633 | case KEY_SPEC_GROUP_KEYRING: |
| 634 | /* group keyrings are not yet supported */ |
| 635 | key = ERR_PTR(-EINVAL); |
| 636 | goto error; |
| 637 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 638 | case KEY_SPEC_REQKEY_AUTH_KEY: |
| 639 | key = context->request_key_auth; |
| 640 | if (!key) |
| 641 | goto error; |
| 642 | |
| 643 | atomic_inc(&key->usage); |
| 644 | key_ref = make_key_ref(key, 1); |
| 645 | break; |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 648 | key_ref = ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | if (id < 1) |
| 650 | goto error; |
| 651 | |
| 652 | key = key_lookup(id); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 653 | if (IS_ERR(key)) { |
| 654 | key_ref = ERR_PTR(PTR_ERR(key)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | goto error; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 656 | } |
| 657 | |
| 658 | key_ref = make_key_ref(key, 0); |
| 659 | |
| 660 | /* check to see if we possess the key */ |
| 661 | skey_ref = search_process_keyrings(key->type, key, |
| 662 | lookup_user_key_possessed, |
| 663 | current); |
| 664 | |
| 665 | if (!IS_ERR(skey_ref)) { |
| 666 | key_put(key); |
| 667 | key_ref = skey_ref; |
| 668 | } |
| 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | break; |
| 671 | } |
| 672 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 673 | /* check the status */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | if (perm) { |
| 675 | ret = key_validate(key); |
| 676 | if (ret < 0) |
| 677 | goto invalid_key; |
| 678 | } |
| 679 | |
| 680 | ret = -EIO; |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 681 | if (!partial && !test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | goto invalid_key; |
| 683 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 684 | /* check the permissions */ |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 685 | ret = key_task_permission(key_ref, context, perm); |
| 686 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | goto invalid_key; |
| 688 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 689 | error: |
| 690 | return key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 692 | invalid_key: |
| 693 | key_ref_put(key_ref); |
| 694 | key_ref = ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | goto error; |
| 696 | |
| 697 | } /* end lookup_user_key() */ |
| 698 | |
| 699 | /*****************************************************************************/ |
| 700 | /* |
| 701 | * join the named keyring as the session keyring if possible, or attempt to |
| 702 | * create a new one of that name if not |
| 703 | * - if the name is NULL, an empty anonymous keyring is installed instead |
| 704 | * - named session keyring joining is done with a semaphore held |
| 705 | */ |
| 706 | long join_session_keyring(const char *name) |
| 707 | { |
| 708 | struct task_struct *tsk = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | struct key *keyring; |
| 710 | long ret; |
| 711 | |
| 712 | /* if no name is provided, install an anonymous keyring */ |
| 713 | if (!name) { |
| 714 | ret = install_session_keyring(tsk, NULL); |
| 715 | if (ret < 0) |
| 716 | goto error; |
| 717 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 718 | rcu_read_lock(); |
| 719 | ret = rcu_dereference(tsk->signal->session_keyring)->serial; |
| 720 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | goto error; |
| 722 | } |
| 723 | |
| 724 | /* allow the user to join or create a named keyring */ |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 725 | mutex_lock(&key_session_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | /* look for an existing keyring of this name */ |
| 728 | keyring = find_keyring_by_name(name, 0); |
| 729 | if (PTR_ERR(keyring) == -ENOKEY) { |
| 730 | /* not found - try and create a new one */ |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 731 | keyring = keyring_alloc(name, tsk->uid, tsk->gid, tsk, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | if (IS_ERR(keyring)) { |
| 733 | ret = PTR_ERR(keyring); |
David Howells | bcf945d | 2005-08-04 13:07:06 -0700 | [diff] [blame] | 734 | goto error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | } |
| 736 | } |
| 737 | else if (IS_ERR(keyring)) { |
| 738 | ret = PTR_ERR(keyring); |
| 739 | goto error2; |
| 740 | } |
| 741 | |
| 742 | /* we've got a keyring - now to install it */ |
| 743 | ret = install_session_keyring(tsk, keyring); |
| 744 | if (ret < 0) |
| 745 | goto error2; |
| 746 | |
| 747 | ret = keyring->serial; |
| 748 | key_put(keyring); |
| 749 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 750 | error2: |
Ingo Molnar | bb00307 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 751 | mutex_unlock(&key_session_mutex); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 752 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | return ret; |
| 754 | |
| 755 | } /* end join_session_keyring() */ |