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1 | /* |
2 | * linux/ipc/shm.c |
3 | * Copyright (C) 1992, 1993 Krishna Balasubramanian |
4 | * Many improvements/fixes by Bruno Haible. |
5 | * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. |
6 | * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli. |
7 | * |
8 | * /proc/sysvipc/shm support (c) 1999 Dragos Acostachioaie <dragos@iname.com> |
9 | * BIGMEM support, Andrea Arcangeli <andrea@suse.de> |
10 | * SMP thread shm, Jean-Luc Boyard <jean-luc.boyard@siemens.fr> |
11 | * HIGHMEM support, Ingo Molnar <mingo@redhat.com> |
12 | * Make shmmax, shmall, shmmni sysctl'able, Christoph Rohland <cr@sap.com> |
13 | * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com> |
14 | * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com> |
15 | * |
16 | * support for audit of ipc object properties and permission changes |
17 | * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
18 | * |
19 | * namespaces support |
20 | * OpenVZ, SWsoft Inc. |
21 | * Pavel Emelianov <xemul@openvz.org> |
22 | */ |
23 | |
24 | #include <linux/slab.h> |
25 | #include <linux/mm.h> |
26 | #include <linux/hugetlb.h> |
27 | #include <linux/shm.h> |
28 | #include <linux/init.h> |
29 | #include <linux/file.h> |
30 | #include <linux/mman.h> |
31 | #include <linux/shmem_fs.h> |
32 | #include <linux/security.h> |
33 | #include <linux/syscalls.h> |
34 | #include <linux/audit.h> |
35 | #include <linux/capability.h> |
36 | #include <linux/ptrace.h> |
37 | #include <linux/seq_file.h> |
38 | #include <linux/rwsem.h> |
39 | #include <linux/nsproxy.h> |
40 | #include <linux/mount.h> |
41 | #include <linux/ipc_namespace.h> |
42 | |
43 | #include <asm/uaccess.h> |
44 | |
45 | #include "util.h" |
46 | |
47 | struct shm_file_data { |
48 | int id; |
49 | struct ipc_namespace *ns; |
50 | struct file *file; |
51 | const struct vm_operations_struct *vm_ops; |
52 | }; |
53 | |
54 | #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data)) |
55 | |
56 | static const struct file_operations shm_file_operations; |
57 | static const struct vm_operations_struct shm_vm_ops; |
58 | |
59 | #define shm_ids(ns) ((ns)->ids[IPC_SHM_IDS]) |
60 | |
61 | #define shm_unlock(shp) \ |
62 | ipc_unlock(&(shp)->shm_perm) |
63 | |
64 | static int newseg(struct ipc_namespace *, struct ipc_params *); |
65 | static void shm_open(struct vm_area_struct *vma); |
66 | static void shm_close(struct vm_area_struct *vma); |
67 | static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp); |
68 | #ifdef CONFIG_PROC_FS |
69 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it); |
70 | #endif |
71 | |
72 | void shm_init_ns(struct ipc_namespace *ns) |
73 | { |
74 | ns->shm_ctlmax = SHMMAX; |
75 | ns->shm_ctlall = SHMALL; |
76 | ns->shm_ctlmni = SHMMNI; |
77 | ns->shm_rmid_forced = 0; |
78 | ns->shm_tot = 0; |
79 | ipc_init_ids(&shm_ids(ns)); |
80 | } |
81 | |
82 | /* |
83 | * Called with shm_ids.rw_mutex (writer) and the shp structure locked. |
84 | * Only shm_ids.rw_mutex remains locked on exit. |
85 | */ |
86 | static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
87 | { |
88 | struct shmid_kernel *shp; |
89 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
90 | |
91 | if (shp->shm_nattch){ |
92 | shp->shm_perm.mode |= SHM_DEST; |
93 | /* Do not find it any more */ |
94 | shp->shm_perm.key = IPC_PRIVATE; |
95 | shm_unlock(shp); |
96 | } else |
97 | shm_destroy(ns, shp); |
98 | } |
99 | |
100 | #ifdef CONFIG_IPC_NS |
101 | void shm_exit_ns(struct ipc_namespace *ns) |
102 | { |
103 | free_ipcs(ns, &shm_ids(ns), do_shm_rmid); |
104 | idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr); |
105 | } |
106 | #endif |
107 | |
108 | static int __init ipc_ns_init(void) |
109 | { |
110 | shm_init_ns(&init_ipc_ns); |
111 | return 0; |
112 | } |
113 | |
114 | pure_initcall(ipc_ns_init); |
115 | |
116 | void __init shm_init (void) |
117 | { |
118 | ipc_init_proc_interface("sysvipc/shm", |
119 | #if BITS_PER_LONG <= 32 |
120 | " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n", |
121 | #else |
122 | " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime rss swap\n", |
123 | #endif |
124 | IPC_SHM_IDS, sysvipc_shm_proc_show); |
125 | } |
126 | |
127 | /* |
128 | * shm_lock_(check_) routines are called in the paths where the rw_mutex |
129 | * is not necessarily held. |
130 | */ |
131 | static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id) |
132 | { |
133 | struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id); |
134 | |
135 | if (IS_ERR(ipcp)) |
136 | return (struct shmid_kernel *)ipcp; |
137 | |
138 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
139 | } |
140 | |
141 | static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp) |
142 | { |
143 | rcu_read_lock(); |
144 | spin_lock(&ipcp->shm_perm.lock); |
145 | } |
146 | |
147 | static inline struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns, |
148 | int id) |
149 | { |
150 | struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id); |
151 | |
152 | if (IS_ERR(ipcp)) |
153 | return (struct shmid_kernel *)ipcp; |
154 | |
155 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
156 | } |
157 | |
158 | static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s) |
159 | { |
160 | ipc_rmid(&shm_ids(ns), &s->shm_perm); |
161 | } |
162 | |
163 | |
164 | /* This is called by fork, once for every shm attach. */ |
165 | static void shm_open(struct vm_area_struct *vma) |
166 | { |
167 | struct file *file = vma->vm_file; |
168 | struct shm_file_data *sfd = shm_file_data(file); |
169 | struct shmid_kernel *shp; |
170 | |
171 | shp = shm_lock(sfd->ns, sfd->id); |
172 | BUG_ON(IS_ERR(shp)); |
173 | shp->shm_atim = get_seconds(); |
174 | shp->shm_lprid = task_tgid_vnr(current); |
175 | shp->shm_nattch++; |
176 | shm_unlock(shp); |
177 | } |
178 | |
179 | /* |
180 | * shm_destroy - free the struct shmid_kernel |
181 | * |
182 | * @ns: namespace |
183 | * @shp: struct to free |
184 | * |
185 | * It has to be called with shp and shm_ids.rw_mutex (writer) locked, |
186 | * but returns with shp unlocked and freed. |
187 | */ |
188 | static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
189 | { |
190 | ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
191 | shm_rmid(ns, shp); |
192 | shm_unlock(shp); |
193 | if (!is_file_hugepages(shp->shm_file)) |
194 | shmem_lock(shp->shm_file, 0, shp->mlock_user); |
195 | else if (shp->mlock_user) |
196 | user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size, |
197 | shp->mlock_user); |
198 | fput (shp->shm_file); |
199 | security_shm_free(shp); |
200 | ipc_rcu_putref(shp); |
201 | } |
202 | |
203 | /* |
204 | * shm_may_destroy - identifies whether shm segment should be destroyed now |
205 | * |
206 | * Returns true if and only if there are no active users of the segment and |
207 | * one of the following is true: |
208 | * |
209 | * 1) shmctl(id, IPC_RMID, NULL) was called for this shp |
210 | * |
211 | * 2) sysctl kernel.shm_rmid_forced is set to 1. |
212 | */ |
213 | static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
214 | { |
215 | return (shp->shm_nattch == 0) && |
216 | (ns->shm_rmid_forced || |
217 | (shp->shm_perm.mode & SHM_DEST)); |
218 | } |
219 | |
220 | /* |
221 | * remove the attach descriptor vma. |
222 | * free memory for segment if it is marked destroyed. |
223 | * The descriptor has already been removed from the current->mm->mmap list |
224 | * and will later be kfree()d. |
225 | */ |
226 | static void shm_close(struct vm_area_struct *vma) |
227 | { |
228 | struct file * file = vma->vm_file; |
229 | struct shm_file_data *sfd = shm_file_data(file); |
230 | struct shmid_kernel *shp; |
231 | struct ipc_namespace *ns = sfd->ns; |
232 | |
233 | down_write(&shm_ids(ns).rw_mutex); |
234 | /* remove from the list of attaches of the shm segment */ |
235 | shp = shm_lock(ns, sfd->id); |
236 | BUG_ON(IS_ERR(shp)); |
237 | shp->shm_lprid = task_tgid_vnr(current); |
238 | shp->shm_dtim = get_seconds(); |
239 | shp->shm_nattch--; |
240 | if (shm_may_destroy(ns, shp)) |
241 | shm_destroy(ns, shp); |
242 | else |
243 | shm_unlock(shp); |
244 | up_write(&shm_ids(ns).rw_mutex); |
245 | } |
246 | |
247 | /* Called with ns->shm_ids(ns).rw_mutex locked */ |
248 | static int shm_try_destroy_current(int id, void *p, void *data) |
249 | { |
250 | struct ipc_namespace *ns = data; |
251 | struct kern_ipc_perm *ipcp = p; |
252 | struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
253 | |
254 | if (shp->shm_creator != current) |
255 | return 0; |
256 | |
257 | /* |
258 | * Mark it as orphaned to destroy the segment when |
259 | * kernel.shm_rmid_forced is changed. |
260 | * It is noop if the following shm_may_destroy() returns true. |
261 | */ |
262 | shp->shm_creator = NULL; |
263 | |
264 | /* |
265 | * Don't even try to destroy it. If shm_rmid_forced=0 and IPC_RMID |
266 | * is not set, it shouldn't be deleted here. |
267 | */ |
268 | if (!ns->shm_rmid_forced) |
269 | return 0; |
270 | |
271 | if (shm_may_destroy(ns, shp)) { |
272 | shm_lock_by_ptr(shp); |
273 | shm_destroy(ns, shp); |
274 | } |
275 | return 0; |
276 | } |
277 | |
278 | /* Called with ns->shm_ids(ns).rw_mutex locked */ |
279 | static int shm_try_destroy_orphaned(int id, void *p, void *data) |
280 | { |
281 | struct ipc_namespace *ns = data; |
282 | struct kern_ipc_perm *ipcp = p; |
283 | struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
284 | |
285 | /* |
286 | * We want to destroy segments without users and with already |
287 | * exit'ed originating process. |
288 | * |
289 | * As shp->* are changed under rw_mutex, it's safe to skip shp locking. |
290 | */ |
291 | if (shp->shm_creator != NULL) |
292 | return 0; |
293 | |
294 | if (shm_may_destroy(ns, shp)) { |
295 | shm_lock_by_ptr(shp); |
296 | shm_destroy(ns, shp); |
297 | } |
298 | return 0; |
299 | } |
300 | |
301 | void shm_destroy_orphaned(struct ipc_namespace *ns) |
302 | { |
303 | down_write(&shm_ids(ns).rw_mutex); |
304 | if (shm_ids(ns).in_use) |
305 | idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns); |
306 | up_write(&shm_ids(ns).rw_mutex); |
307 | } |
308 | |
309 | |
310 | void exit_shm(struct task_struct *task) |
311 | { |
312 | struct ipc_namespace *ns = task->nsproxy->ipc_ns; |
313 | |
314 | if (shm_ids(ns).in_use == 0) |
315 | return; |
316 | |
317 | /* Destroy all already created segments, but not mapped yet */ |
318 | down_write(&shm_ids(ns).rw_mutex); |
319 | if (shm_ids(ns).in_use) |
320 | idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_current, ns); |
321 | up_write(&shm_ids(ns).rw_mutex); |
322 | } |
323 | |
324 | static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
325 | { |
326 | struct file *file = vma->vm_file; |
327 | struct shm_file_data *sfd = shm_file_data(file); |
328 | |
329 | return sfd->vm_ops->fault(vma, vmf); |
330 | } |
331 | |
332 | #ifdef CONFIG_NUMA |
333 | static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) |
334 | { |
335 | struct file *file = vma->vm_file; |
336 | struct shm_file_data *sfd = shm_file_data(file); |
337 | int err = 0; |
338 | if (sfd->vm_ops->set_policy) |
339 | err = sfd->vm_ops->set_policy(vma, new); |
340 | return err; |
341 | } |
342 | |
343 | static struct mempolicy *shm_get_policy(struct vm_area_struct *vma, |
344 | unsigned long addr) |
345 | { |
346 | struct file *file = vma->vm_file; |
347 | struct shm_file_data *sfd = shm_file_data(file); |
348 | struct mempolicy *pol = NULL; |
349 | |
350 | if (sfd->vm_ops->get_policy) |
351 | pol = sfd->vm_ops->get_policy(vma, addr); |
352 | else if (vma->vm_policy) |
353 | pol = vma->vm_policy; |
354 | |
355 | return pol; |
356 | } |
357 | #endif |
358 | |
359 | static int shm_mmap(struct file * file, struct vm_area_struct * vma) |
360 | { |
361 | struct shm_file_data *sfd = shm_file_data(file); |
362 | int ret; |
363 | |
364 | ret = sfd->file->f_op->mmap(sfd->file, vma); |
365 | if (ret != 0) |
366 | return ret; |
367 | sfd->vm_ops = vma->vm_ops; |
368 | #ifdef CONFIG_MMU |
369 | BUG_ON(!sfd->vm_ops->fault); |
370 | #endif |
371 | vma->vm_ops = &shm_vm_ops; |
372 | shm_open(vma); |
373 | |
374 | return ret; |
375 | } |
376 | |
377 | static int shm_release(struct inode *ino, struct file *file) |
378 | { |
379 | struct shm_file_data *sfd = shm_file_data(file); |
380 | |
381 | put_ipc_ns(sfd->ns); |
382 | shm_file_data(file) = NULL; |
383 | kfree(sfd); |
384 | return 0; |
385 | } |
386 | |
387 | static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
388 | { |
389 | struct shm_file_data *sfd = shm_file_data(file); |
390 | |
391 | if (!sfd->file->f_op->fsync) |
392 | return -EINVAL; |
393 | return sfd->file->f_op->fsync(sfd->file, start, end, datasync); |
394 | } |
395 | |
396 | static unsigned long shm_get_unmapped_area(struct file *file, |
397 | unsigned long addr, unsigned long len, unsigned long pgoff, |
398 | unsigned long flags) |
399 | { |
400 | struct shm_file_data *sfd = shm_file_data(file); |
401 | return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len, |
402 | pgoff, flags); |
403 | } |
404 | |
405 | static const struct file_operations shm_file_operations = { |
406 | .mmap = shm_mmap, |
407 | .fsync = shm_fsync, |
408 | .release = shm_release, |
409 | #ifndef CONFIG_MMU |
410 | .get_unmapped_area = shm_get_unmapped_area, |
411 | #endif |
412 | .llseek = noop_llseek, |
413 | }; |
414 | |
415 | static const struct file_operations shm_file_operations_huge = { |
416 | .mmap = shm_mmap, |
417 | .fsync = shm_fsync, |
418 | .release = shm_release, |
419 | .get_unmapped_area = shm_get_unmapped_area, |
420 | .llseek = noop_llseek, |
421 | }; |
422 | |
423 | int is_file_shm_hugepages(struct file *file) |
424 | { |
425 | return file->f_op == &shm_file_operations_huge; |
426 | } |
427 | |
428 | static const struct vm_operations_struct shm_vm_ops = { |
429 | .open = shm_open, /* callback for a new vm-area open */ |
430 | .close = shm_close, /* callback for when the vm-area is released */ |
431 | .fault = shm_fault, |
432 | #if defined(CONFIG_NUMA) |
433 | .set_policy = shm_set_policy, |
434 | .get_policy = shm_get_policy, |
435 | #endif |
436 | }; |
437 | |
438 | /** |
439 | * newseg - Create a new shared memory segment |
440 | * @ns: namespace |
441 | * @params: ptr to the structure that contains key, size and shmflg |
442 | * |
443 | * Called with shm_ids.rw_mutex held as a writer. |
444 | */ |
445 | |
446 | static int newseg(struct ipc_namespace *ns, struct ipc_params *params) |
447 | { |
448 | key_t key = params->key; |
449 | int shmflg = params->flg; |
450 | size_t size = params->u.size; |
451 | int error; |
452 | struct shmid_kernel *shp; |
453 | int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; |
454 | struct file * file; |
455 | char name[13]; |
456 | int id; |
457 | vm_flags_t acctflag = 0; |
458 | |
459 | if (size < SHMMIN || size > ns->shm_ctlmax) |
460 | return -EINVAL; |
461 | |
462 | if (ns->shm_tot + numpages > ns->shm_ctlall) |
463 | return -ENOSPC; |
464 | |
465 | shp = ipc_rcu_alloc(sizeof(*shp)); |
466 | if (!shp) |
467 | return -ENOMEM; |
468 | |
469 | shp->shm_perm.key = key; |
470 | shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
471 | shp->mlock_user = NULL; |
472 | |
473 | shp->shm_perm.security = NULL; |
474 | error = security_shm_alloc(shp); |
475 | if (error) { |
476 | ipc_rcu_putref(shp); |
477 | return error; |
478 | } |
479 | |
480 | sprintf (name, "SYSV%08x", key); |
481 | if (shmflg & SHM_HUGETLB) { |
482 | /* hugetlb_file_setup applies strict accounting */ |
483 | if (shmflg & SHM_NORESERVE) |
484 | acctflag = VM_NORESERVE; |
485 | file = hugetlb_file_setup(name, size, acctflag, |
486 | &shp->mlock_user, HUGETLB_SHMFS_INODE); |
487 | } else { |
488 | /* |
489 | * Do not allow no accounting for OVERCOMMIT_NEVER, even |
490 | * if it's asked for. |
491 | */ |
492 | if ((shmflg & SHM_NORESERVE) && |
493 | sysctl_overcommit_memory != OVERCOMMIT_NEVER) |
494 | acctflag = VM_NORESERVE; |
495 | file = shmem_file_setup(name, size, acctflag); |
496 | } |
497 | error = PTR_ERR(file); |
498 | if (IS_ERR(file)) |
499 | goto no_file; |
500 | |
501 | id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); |
502 | if (id < 0) { |
503 | error = id; |
504 | goto no_id; |
505 | } |
506 | |
507 | shp->shm_cprid = task_tgid_vnr(current); |
508 | shp->shm_lprid = 0; |
509 | shp->shm_atim = shp->shm_dtim = 0; |
510 | shp->shm_ctim = get_seconds(); |
511 | shp->shm_segsz = size; |
512 | shp->shm_nattch = 0; |
513 | shp->shm_file = file; |
514 | shp->shm_creator = current; |
515 | /* |
516 | * shmid gets reported as "inode#" in /proc/pid/maps. |
517 | * proc-ps tools use this. Changing this will break them. |
518 | */ |
519 | file->f_dentry->d_inode->i_ino = shp->shm_perm.id; |
520 | |
521 | ns->shm_tot += numpages; |
522 | error = shp->shm_perm.id; |
523 | shm_unlock(shp); |
524 | return error; |
525 | |
526 | no_id: |
527 | if (is_file_hugepages(file) && shp->mlock_user) |
528 | user_shm_unlock(size, shp->mlock_user); |
529 | fput(file); |
530 | no_file: |
531 | security_shm_free(shp); |
532 | ipc_rcu_putref(shp); |
533 | return error; |
534 | } |
535 | |
536 | /* |
537 | * Called with shm_ids.rw_mutex and ipcp locked. |
538 | */ |
539 | static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg) |
540 | { |
541 | struct shmid_kernel *shp; |
542 | |
543 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
544 | return security_shm_associate(shp, shmflg); |
545 | } |
546 | |
547 | /* |
548 | * Called with shm_ids.rw_mutex and ipcp locked. |
549 | */ |
550 | static inline int shm_more_checks(struct kern_ipc_perm *ipcp, |
551 | struct ipc_params *params) |
552 | { |
553 | struct shmid_kernel *shp; |
554 | |
555 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
556 | if (shp->shm_segsz < params->u.size) |
557 | return -EINVAL; |
558 | |
559 | return 0; |
560 | } |
561 | |
562 | SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg) |
563 | { |
564 | struct ipc_namespace *ns; |
565 | struct ipc_ops shm_ops; |
566 | struct ipc_params shm_params; |
567 | |
568 | ns = current->nsproxy->ipc_ns; |
569 | |
570 | shm_ops.getnew = newseg; |
571 | shm_ops.associate = shm_security; |
572 | shm_ops.more_checks = shm_more_checks; |
573 | |
574 | shm_params.key = key; |
575 | shm_params.flg = shmflg; |
576 | shm_params.u.size = size; |
577 | |
578 | return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params); |
579 | } |
580 | |
581 | static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) |
582 | { |
583 | switch(version) { |
584 | case IPC_64: |
585 | return copy_to_user(buf, in, sizeof(*in)); |
586 | case IPC_OLD: |
587 | { |
588 | struct shmid_ds out; |
589 | |
590 | memset(&out, 0, sizeof(out)); |
591 | ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); |
592 | out.shm_segsz = in->shm_segsz; |
593 | out.shm_atime = in->shm_atime; |
594 | out.shm_dtime = in->shm_dtime; |
595 | out.shm_ctime = in->shm_ctime; |
596 | out.shm_cpid = in->shm_cpid; |
597 | out.shm_lpid = in->shm_lpid; |
598 | out.shm_nattch = in->shm_nattch; |
599 | |
600 | return copy_to_user(buf, &out, sizeof(out)); |
601 | } |
602 | default: |
603 | return -EINVAL; |
604 | } |
605 | } |
606 | |
607 | static inline unsigned long |
608 | copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version) |
609 | { |
610 | switch(version) { |
611 | case IPC_64: |
612 | if (copy_from_user(out, buf, sizeof(*out))) |
613 | return -EFAULT; |
614 | return 0; |
615 | case IPC_OLD: |
616 | { |
617 | struct shmid_ds tbuf_old; |
618 | |
619 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) |
620 | return -EFAULT; |
621 | |
622 | out->shm_perm.uid = tbuf_old.shm_perm.uid; |
623 | out->shm_perm.gid = tbuf_old.shm_perm.gid; |
624 | out->shm_perm.mode = tbuf_old.shm_perm.mode; |
625 | |
626 | return 0; |
627 | } |
628 | default: |
629 | return -EINVAL; |
630 | } |
631 | } |
632 | |
633 | static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) |
634 | { |
635 | switch(version) { |
636 | case IPC_64: |
637 | return copy_to_user(buf, in, sizeof(*in)); |
638 | case IPC_OLD: |
639 | { |
640 | struct shminfo out; |
641 | |
642 | if(in->shmmax > INT_MAX) |
643 | out.shmmax = INT_MAX; |
644 | else |
645 | out.shmmax = (int)in->shmmax; |
646 | |
647 | out.shmmin = in->shmmin; |
648 | out.shmmni = in->shmmni; |
649 | out.shmseg = in->shmseg; |
650 | out.shmall = in->shmall; |
651 | |
652 | return copy_to_user(buf, &out, sizeof(out)); |
653 | } |
654 | default: |
655 | return -EINVAL; |
656 | } |
657 | } |
658 | |
659 | /* |
660 | * Calculate and add used RSS and swap pages of a shm. |
661 | * Called with shm_ids.rw_mutex held as a reader |
662 | */ |
663 | static void shm_add_rss_swap(struct shmid_kernel *shp, |
664 | unsigned long *rss_add, unsigned long *swp_add) |
665 | { |
666 | struct inode *inode; |
667 | |
668 | inode = shp->shm_file->f_path.dentry->d_inode; |
669 | |
670 | if (is_file_hugepages(shp->shm_file)) { |
671 | struct address_space *mapping = inode->i_mapping; |
672 | struct hstate *h = hstate_file(shp->shm_file); |
673 | *rss_add += pages_per_huge_page(h) * mapping->nrpages; |
674 | } else { |
675 | #ifdef CONFIG_SHMEM |
676 | struct shmem_inode_info *info = SHMEM_I(inode); |
677 | spin_lock(&info->lock); |
678 | *rss_add += inode->i_mapping->nrpages; |
679 | *swp_add += info->swapped; |
680 | spin_unlock(&info->lock); |
681 | #else |
682 | *rss_add += inode->i_mapping->nrpages; |
683 | #endif |
684 | } |
685 | } |
686 | |
687 | /* |
688 | * Called with shm_ids.rw_mutex held as a reader |
689 | */ |
690 | static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, |
691 | unsigned long *swp) |
692 | { |
693 | int next_id; |
694 | int total, in_use; |
695 | |
696 | *rss = 0; |
697 | *swp = 0; |
698 | |
699 | in_use = shm_ids(ns).in_use; |
700 | |
701 | for (total = 0, next_id = 0; total < in_use; next_id++) { |
702 | struct kern_ipc_perm *ipc; |
703 | struct shmid_kernel *shp; |
704 | |
705 | ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id); |
706 | if (ipc == NULL) |
707 | continue; |
708 | shp = container_of(ipc, struct shmid_kernel, shm_perm); |
709 | |
710 | shm_add_rss_swap(shp, rss, swp); |
711 | |
712 | total++; |
713 | } |
714 | } |
715 | |
716 | /* |
717 | * This function handles some shmctl commands which require the rw_mutex |
718 | * to be held in write mode. |
719 | * NOTE: no locks must be held, the rw_mutex is taken inside this function. |
720 | */ |
721 | static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd, |
722 | struct shmid_ds __user *buf, int version) |
723 | { |
724 | struct kern_ipc_perm *ipcp; |
725 | struct shmid64_ds shmid64; |
726 | struct shmid_kernel *shp; |
727 | int err; |
728 | |
729 | if (cmd == IPC_SET) { |
730 | if (copy_shmid_from_user(&shmid64, buf, version)) |
731 | return -EFAULT; |
732 | } |
733 | |
734 | ipcp = ipcctl_pre_down(ns, &shm_ids(ns), shmid, cmd, |
735 | &shmid64.shm_perm, 0); |
736 | if (IS_ERR(ipcp)) |
737 | return PTR_ERR(ipcp); |
738 | |
739 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
740 | |
741 | err = security_shm_shmctl(shp, cmd); |
742 | if (err) |
743 | goto out_unlock; |
744 | switch (cmd) { |
745 | case IPC_RMID: |
746 | do_shm_rmid(ns, ipcp); |
747 | goto out_up; |
748 | case IPC_SET: |
749 | ipc_update_perm(&shmid64.shm_perm, ipcp); |
750 | shp->shm_ctim = get_seconds(); |
751 | break; |
752 | default: |
753 | err = -EINVAL; |
754 | } |
755 | out_unlock: |
756 | shm_unlock(shp); |
757 | out_up: |
758 | up_write(&shm_ids(ns).rw_mutex); |
759 | return err; |
760 | } |
761 | |
762 | SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf) |
763 | { |
764 | struct shmid_kernel *shp; |
765 | int err, version; |
766 | struct ipc_namespace *ns; |
767 | |
768 | if (cmd < 0 || shmid < 0) { |
769 | err = -EINVAL; |
770 | goto out; |
771 | } |
772 | |
773 | version = ipc_parse_version(&cmd); |
774 | ns = current->nsproxy->ipc_ns; |
775 | |
776 | switch (cmd) { /* replace with proc interface ? */ |
777 | case IPC_INFO: |
778 | { |
779 | struct shminfo64 shminfo; |
780 | |
781 | err = security_shm_shmctl(NULL, cmd); |
782 | if (err) |
783 | return err; |
784 | |
785 | memset(&shminfo, 0, sizeof(shminfo)); |
786 | shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; |
787 | shminfo.shmmax = ns->shm_ctlmax; |
788 | shminfo.shmall = ns->shm_ctlall; |
789 | |
790 | shminfo.shmmin = SHMMIN; |
791 | if(copy_shminfo_to_user (buf, &shminfo, version)) |
792 | return -EFAULT; |
793 | |
794 | down_read(&shm_ids(ns).rw_mutex); |
795 | err = ipc_get_maxid(&shm_ids(ns)); |
796 | up_read(&shm_ids(ns).rw_mutex); |
797 | |
798 | if(err<0) |
799 | err = 0; |
800 | goto out; |
801 | } |
802 | case SHM_INFO: |
803 | { |
804 | struct shm_info shm_info; |
805 | |
806 | err = security_shm_shmctl(NULL, cmd); |
807 | if (err) |
808 | return err; |
809 | |
810 | memset(&shm_info, 0, sizeof(shm_info)); |
811 | down_read(&shm_ids(ns).rw_mutex); |
812 | shm_info.used_ids = shm_ids(ns).in_use; |
813 | shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp); |
814 | shm_info.shm_tot = ns->shm_tot; |
815 | shm_info.swap_attempts = 0; |
816 | shm_info.swap_successes = 0; |
817 | err = ipc_get_maxid(&shm_ids(ns)); |
818 | up_read(&shm_ids(ns).rw_mutex); |
819 | if (copy_to_user(buf, &shm_info, sizeof(shm_info))) { |
820 | err = -EFAULT; |
821 | goto out; |
822 | } |
823 | |
824 | err = err < 0 ? 0 : err; |
825 | goto out; |
826 | } |
827 | case SHM_STAT: |
828 | case IPC_STAT: |
829 | { |
830 | struct shmid64_ds tbuf; |
831 | int result; |
832 | |
833 | if (cmd == SHM_STAT) { |
834 | shp = shm_lock(ns, shmid); |
835 | if (IS_ERR(shp)) { |
836 | err = PTR_ERR(shp); |
837 | goto out; |
838 | } |
839 | result = shp->shm_perm.id; |
840 | } else { |
841 | shp = shm_lock_check(ns, shmid); |
842 | if (IS_ERR(shp)) { |
843 | err = PTR_ERR(shp); |
844 | goto out; |
845 | } |
846 | result = 0; |
847 | } |
848 | err = -EACCES; |
849 | if (ipcperms(ns, &shp->shm_perm, S_IRUGO)) |
850 | goto out_unlock; |
851 | err = security_shm_shmctl(shp, cmd); |
852 | if (err) |
853 | goto out_unlock; |
854 | memset(&tbuf, 0, sizeof(tbuf)); |
855 | kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm); |
856 | tbuf.shm_segsz = shp->shm_segsz; |
857 | tbuf.shm_atime = shp->shm_atim; |
858 | tbuf.shm_dtime = shp->shm_dtim; |
859 | tbuf.shm_ctime = shp->shm_ctim; |
860 | tbuf.shm_cpid = shp->shm_cprid; |
861 | tbuf.shm_lpid = shp->shm_lprid; |
862 | tbuf.shm_nattch = shp->shm_nattch; |
863 | shm_unlock(shp); |
864 | if(copy_shmid_to_user (buf, &tbuf, version)) |
865 | err = -EFAULT; |
866 | else |
867 | err = result; |
868 | goto out; |
869 | } |
870 | case SHM_LOCK: |
871 | case SHM_UNLOCK: |
872 | { |
873 | struct file *uninitialized_var(shm_file); |
874 | |
875 | lru_add_drain_all(); /* drain pagevecs to lru lists */ |
876 | |
877 | shp = shm_lock_check(ns, shmid); |
878 | if (IS_ERR(shp)) { |
879 | err = PTR_ERR(shp); |
880 | goto out; |
881 | } |
882 | |
883 | audit_ipc_obj(&(shp->shm_perm)); |
884 | |
885 | if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) { |
886 | uid_t euid = current_euid(); |
887 | err = -EPERM; |
888 | if (euid != shp->shm_perm.uid && |
889 | euid != shp->shm_perm.cuid) |
890 | goto out_unlock; |
891 | if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) |
892 | goto out_unlock; |
893 | } |
894 | |
895 | err = security_shm_shmctl(shp, cmd); |
896 | if (err) |
897 | goto out_unlock; |
898 | |
899 | if(cmd==SHM_LOCK) { |
900 | struct user_struct *user = current_user(); |
901 | if (!is_file_hugepages(shp->shm_file)) { |
902 | err = shmem_lock(shp->shm_file, 1, user); |
903 | if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){ |
904 | shp->shm_perm.mode |= SHM_LOCKED; |
905 | shp->mlock_user = user; |
906 | } |
907 | } |
908 | } else if (!is_file_hugepages(shp->shm_file)) { |
909 | shmem_lock(shp->shm_file, 0, shp->mlock_user); |
910 | shp->shm_perm.mode &= ~SHM_LOCKED; |
911 | shp->mlock_user = NULL; |
912 | } |
913 | shm_unlock(shp); |
914 | goto out; |
915 | } |
916 | case IPC_RMID: |
917 | case IPC_SET: |
918 | err = shmctl_down(ns, shmid, cmd, buf, version); |
919 | return err; |
920 | default: |
921 | return -EINVAL; |
922 | } |
923 | |
924 | out_unlock: |
925 | shm_unlock(shp); |
926 | out: |
927 | return err; |
928 | } |
929 | |
930 | /* |
931 | * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. |
932 | * |
933 | * NOTE! Despite the name, this is NOT a direct system call entrypoint. The |
934 | * "raddr" thing points to kernel space, and there has to be a wrapper around |
935 | * this. |
936 | */ |
937 | long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr) |
938 | { |
939 | struct shmid_kernel *shp; |
940 | unsigned long addr; |
941 | unsigned long size; |
942 | struct file * file; |
943 | int err; |
944 | unsigned long flags; |
945 | unsigned long prot; |
946 | int acc_mode; |
947 | unsigned long user_addr; |
948 | struct ipc_namespace *ns; |
949 | struct shm_file_data *sfd; |
950 | struct path path; |
951 | fmode_t f_mode; |
952 | |
953 | err = -EINVAL; |
954 | if (shmid < 0) |
955 | goto out; |
956 | else if ((addr = (ulong)shmaddr)) { |
957 | if (addr & (SHMLBA-1)) { |
958 | if (shmflg & SHM_RND) |
959 | addr &= ~(SHMLBA-1); /* round down */ |
960 | else |
961 | #ifndef __ARCH_FORCE_SHMLBA |
962 | if (addr & ~PAGE_MASK) |
963 | #endif |
964 | goto out; |
965 | } |
966 | flags = MAP_SHARED | MAP_FIXED; |
967 | } else { |
968 | if ((shmflg & SHM_REMAP)) |
969 | goto out; |
970 | |
971 | flags = MAP_SHARED; |
972 | } |
973 | |
974 | if (shmflg & SHM_RDONLY) { |
975 | prot = PROT_READ; |
976 | acc_mode = S_IRUGO; |
977 | f_mode = FMODE_READ; |
978 | } else { |
979 | prot = PROT_READ | PROT_WRITE; |
980 | acc_mode = S_IRUGO | S_IWUGO; |
981 | f_mode = FMODE_READ | FMODE_WRITE; |
982 | } |
983 | if (shmflg & SHM_EXEC) { |
984 | prot |= PROT_EXEC; |
985 | acc_mode |= S_IXUGO; |
986 | } |
987 | |
988 | /* |
989 | * We cannot rely on the fs check since SYSV IPC does have an |
990 | * additional creator id... |
991 | */ |
992 | ns = current->nsproxy->ipc_ns; |
993 | shp = shm_lock_check(ns, shmid); |
994 | if (IS_ERR(shp)) { |
995 | err = PTR_ERR(shp); |
996 | goto out; |
997 | } |
998 | |
999 | err = -EACCES; |
1000 | if (ipcperms(ns, &shp->shm_perm, acc_mode)) |
1001 | goto out_unlock; |
1002 | |
1003 | err = security_shm_shmat(shp, shmaddr, shmflg); |
1004 | if (err) |
1005 | goto out_unlock; |
1006 | |
1007 | path = shp->shm_file->f_path; |
1008 | path_get(&path); |
1009 | shp->shm_nattch++; |
1010 | size = i_size_read(path.dentry->d_inode); |
1011 | shm_unlock(shp); |
1012 | |
1013 | err = -ENOMEM; |
1014 | sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); |
1015 | if (!sfd) |
1016 | goto out_put_dentry; |
1017 | |
1018 | file = alloc_file(&path, f_mode, |
1019 | is_file_hugepages(shp->shm_file) ? |
1020 | &shm_file_operations_huge : |
1021 | &shm_file_operations); |
1022 | if (!file) |
1023 | goto out_free; |
1024 | |
1025 | file->private_data = sfd; |
1026 | file->f_mapping = shp->shm_file->f_mapping; |
1027 | sfd->id = shp->shm_perm.id; |
1028 | sfd->ns = get_ipc_ns(ns); |
1029 | sfd->file = shp->shm_file; |
1030 | sfd->vm_ops = NULL; |
1031 | |
1032 | down_write(¤t->mm->mmap_sem); |
1033 | if (addr && !(shmflg & SHM_REMAP)) { |
1034 | err = -EINVAL; |
1035 | if (find_vma_intersection(current->mm, addr, addr + size)) |
1036 | goto invalid; |
1037 | /* |
1038 | * If shm segment goes below stack, make sure there is some |
1039 | * space left for the stack to grow (at least 4 pages). |
1040 | */ |
1041 | if (addr < current->mm->start_stack && |
1042 | addr > current->mm->start_stack - size - PAGE_SIZE * 5) |
1043 | goto invalid; |
1044 | } |
1045 | |
1046 | user_addr = do_mmap (file, addr, size, prot, flags, 0); |
1047 | *raddr = user_addr; |
1048 | err = 0; |
1049 | if (IS_ERR_VALUE(user_addr)) |
1050 | err = (long)user_addr; |
1051 | invalid: |
1052 | up_write(¤t->mm->mmap_sem); |
1053 | |
1054 | fput(file); |
1055 | |
1056 | out_nattch: |
1057 | down_write(&shm_ids(ns).rw_mutex); |
1058 | shp = shm_lock(ns, shmid); |
1059 | BUG_ON(IS_ERR(shp)); |
1060 | shp->shm_nattch--; |
1061 | if (shm_may_destroy(ns, shp)) |
1062 | shm_destroy(ns, shp); |
1063 | else |
1064 | shm_unlock(shp); |
1065 | up_write(&shm_ids(ns).rw_mutex); |
1066 | |
1067 | out: |
1068 | return err; |
1069 | |
1070 | out_unlock: |
1071 | shm_unlock(shp); |
1072 | goto out; |
1073 | |
1074 | out_free: |
1075 | kfree(sfd); |
1076 | out_put_dentry: |
1077 | path_put(&path); |
1078 | goto out_nattch; |
1079 | } |
1080 | |
1081 | SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg) |
1082 | { |
1083 | unsigned long ret; |
1084 | long err; |
1085 | |
1086 | err = do_shmat(shmid, shmaddr, shmflg, &ret); |
1087 | if (err) |
1088 | return err; |
1089 | force_successful_syscall_return(); |
1090 | return (long)ret; |
1091 | } |
1092 | |
1093 | /* |
1094 | * detach and kill segment if marked destroyed. |
1095 | * The work is done in shm_close. |
1096 | */ |
1097 | SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) |
1098 | { |
1099 | struct mm_struct *mm = current->mm; |
1100 | struct vm_area_struct *vma; |
1101 | unsigned long addr = (unsigned long)shmaddr; |
1102 | int retval = -EINVAL; |
1103 | #ifdef CONFIG_MMU |
1104 | loff_t size = 0; |
1105 | struct vm_area_struct *next; |
1106 | #endif |
1107 | |
1108 | if (addr & ~PAGE_MASK) |
1109 | return retval; |
1110 | |
1111 | down_write(&mm->mmap_sem); |
1112 | |
1113 | /* |
1114 | * This function tries to be smart and unmap shm segments that |
1115 | * were modified by partial mlock or munmap calls: |
1116 | * - It first determines the size of the shm segment that should be |
1117 | * unmapped: It searches for a vma that is backed by shm and that |
1118 | * started at address shmaddr. It records it's size and then unmaps |
1119 | * it. |
1120 | * - Then it unmaps all shm vmas that started at shmaddr and that |
1121 | * are within the initially determined size. |
1122 | * Errors from do_munmap are ignored: the function only fails if |
1123 | * it's called with invalid parameters or if it's called to unmap |
1124 | * a part of a vma. Both calls in this function are for full vmas, |
1125 | * the parameters are directly copied from the vma itself and always |
1126 | * valid - therefore do_munmap cannot fail. (famous last words?) |
1127 | */ |
1128 | /* |
1129 | * If it had been mremap()'d, the starting address would not |
1130 | * match the usual checks anyway. So assume all vma's are |
1131 | * above the starting address given. |
1132 | */ |
1133 | vma = find_vma(mm, addr); |
1134 | |
1135 | #ifdef CONFIG_MMU |
1136 | while (vma) { |
1137 | next = vma->vm_next; |
1138 | |
1139 | /* |
1140 | * Check if the starting address would match, i.e. it's |
1141 | * a fragment created by mprotect() and/or munmap(), or it |
1142 | * otherwise it starts at this address with no hassles. |
1143 | */ |
1144 | if ((vma->vm_ops == &shm_vm_ops) && |
1145 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
1146 | |
1147 | |
1148 | size = vma->vm_file->f_path.dentry->d_inode->i_size; |
1149 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); |
1150 | /* |
1151 | * We discovered the size of the shm segment, so |
1152 | * break out of here and fall through to the next |
1153 | * loop that uses the size information to stop |
1154 | * searching for matching vma's. |
1155 | */ |
1156 | retval = 0; |
1157 | vma = next; |
1158 | break; |
1159 | } |
1160 | vma = next; |
1161 | } |
1162 | |
1163 | /* |
1164 | * We need look no further than the maximum address a fragment |
1165 | * could possibly have landed at. Also cast things to loff_t to |
1166 | * prevent overflows and make comparisons vs. equal-width types. |
1167 | */ |
1168 | size = PAGE_ALIGN(size); |
1169 | while (vma && (loff_t)(vma->vm_end - addr) <= size) { |
1170 | next = vma->vm_next; |
1171 | |
1172 | /* finding a matching vma now does not alter retval */ |
1173 | if ((vma->vm_ops == &shm_vm_ops) && |
1174 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) |
1175 | |
1176 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); |
1177 | vma = next; |
1178 | } |
1179 | |
1180 | #else /* CONFIG_MMU */ |
1181 | /* under NOMMU conditions, the exact address to be destroyed must be |
1182 | * given */ |
1183 | retval = -EINVAL; |
1184 | if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { |
1185 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); |
1186 | retval = 0; |
1187 | } |
1188 | |
1189 | #endif |
1190 | |
1191 | up_write(&mm->mmap_sem); |
1192 | return retval; |
1193 | } |
1194 | |
1195 | #ifdef CONFIG_PROC_FS |
1196 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1197 | { |
1198 | struct shmid_kernel *shp = it; |
1199 | unsigned long rss = 0, swp = 0; |
1200 | |
1201 | shm_add_rss_swap(shp, &rss, &swp); |
1202 | |
1203 | #if BITS_PER_LONG <= 32 |
1204 | #define SIZE_SPEC "%10lu" |
1205 | #else |
1206 | #define SIZE_SPEC "%21lu" |
1207 | #endif |
1208 | |
1209 | return seq_printf(s, |
1210 | "%10d %10d %4o " SIZE_SPEC " %5u %5u " |
1211 | "%5lu %5u %5u %5u %5u %10lu %10lu %10lu " |
1212 | SIZE_SPEC " " SIZE_SPEC "\n", |
1213 | shp->shm_perm.key, |
1214 | shp->shm_perm.id, |
1215 | shp->shm_perm.mode, |
1216 | shp->shm_segsz, |
1217 | shp->shm_cprid, |
1218 | shp->shm_lprid, |
1219 | shp->shm_nattch, |
1220 | shp->shm_perm.uid, |
1221 | shp->shm_perm.gid, |
1222 | shp->shm_perm.cuid, |
1223 | shp->shm_perm.cgid, |
1224 | shp->shm_atim, |
1225 | shp->shm_dtim, |
1226 | shp->shm_ctim, |
1227 | rss * PAGE_SIZE, |
1228 | swp * PAGE_SIZE); |
1229 | } |
1230 | #endif |
1231 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9