ARM: ep93xx: normalize clk API
[platform/kernel/linux-rpi.git] / ipc / shm.c
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  * Better ipc lock (kern_ipc_perm.lock) handling
24  * Davidlohr Bueso <davidlohr.bueso@hp.com>, June 2013.
25  */
26
27 #include <linux/slab.h>
28 #include <linux/mm.h>
29 #include <linux/hugetlb.h>
30 #include <linux/shm.h>
31 #include <linux/init.h>
32 #include <linux/file.h>
33 #include <linux/mman.h>
34 #include <linux/shmem_fs.h>
35 #include <linux/security.h>
36 #include <linux/syscalls.h>
37 #include <linux/audit.h>
38 #include <linux/capability.h>
39 #include <linux/ptrace.h>
40 #include <linux/seq_file.h>
41 #include <linux/rwsem.h>
42 #include <linux/nsproxy.h>
43 #include <linux/mount.h>
44 #include <linux/ipc_namespace.h>
45
46 #include <linux/uaccess.h>
47
48 #include "util.h"
49
50 struct shm_file_data {
51         int id;
52         struct ipc_namespace *ns;
53         struct file *file;
54         const struct vm_operations_struct *vm_ops;
55 };
56
57 #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data))
58
59 static const struct file_operations shm_file_operations;
60 static const struct vm_operations_struct shm_vm_ops;
61
62 #define shm_ids(ns)     ((ns)->ids[IPC_SHM_IDS])
63
64 #define shm_unlock(shp)                 \
65         ipc_unlock(&(shp)->shm_perm)
66
67 static int newseg(struct ipc_namespace *, struct ipc_params *);
68 static void shm_open(struct vm_area_struct *vma);
69 static void shm_close(struct vm_area_struct *vma);
70 static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp);
71 #ifdef CONFIG_PROC_FS
72 static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
73 #endif
74
75 void shm_init_ns(struct ipc_namespace *ns)
76 {
77         ns->shm_ctlmax = SHMMAX;
78         ns->shm_ctlall = SHMALL;
79         ns->shm_ctlmni = SHMMNI;
80         ns->shm_rmid_forced = 0;
81         ns->shm_tot = 0;
82         ipc_init_ids(&shm_ids(ns));
83 }
84
85 /*
86  * Called with shm_ids.rwsem (writer) and the shp structure locked.
87  * Only shm_ids.rwsem remains locked on exit.
88  */
89 static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
90 {
91         struct shmid_kernel *shp;
92
93         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
94
95         if (shp->shm_nattch) {
96                 shp->shm_perm.mode |= SHM_DEST;
97                 /* Do not find it any more */
98                 shp->shm_perm.key = IPC_PRIVATE;
99                 shm_unlock(shp);
100         } else
101                 shm_destroy(ns, shp);
102 }
103
104 #ifdef CONFIG_IPC_NS
105 void shm_exit_ns(struct ipc_namespace *ns)
106 {
107         free_ipcs(ns, &shm_ids(ns), do_shm_rmid);
108         idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr);
109 }
110 #endif
111
112 static int __init ipc_ns_init(void)
113 {
114         shm_init_ns(&init_ipc_ns);
115         return 0;
116 }
117
118 pure_initcall(ipc_ns_init);
119
120 void __init shm_init(void)
121 {
122         ipc_init_proc_interface("sysvipc/shm",
123 #if BITS_PER_LONG <= 32
124                                 "       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime        rss       swap\n",
125 #else
126                                 "       key      shmid perms                  size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime                   rss                  swap\n",
127 #endif
128                                 IPC_SHM_IDS, sysvipc_shm_proc_show);
129 }
130
131 static inline struct shmid_kernel *shm_obtain_object(struct ipc_namespace *ns, int id)
132 {
133         struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&shm_ids(ns), id);
134
135         if (IS_ERR(ipcp))
136                 return ERR_CAST(ipcp);
137
138         return container_of(ipcp, struct shmid_kernel, shm_perm);
139 }
140
141 static inline struct shmid_kernel *shm_obtain_object_check(struct ipc_namespace *ns, int id)
142 {
143         struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&shm_ids(ns), id);
144
145         if (IS_ERR(ipcp))
146                 return ERR_CAST(ipcp);
147
148         return container_of(ipcp, struct shmid_kernel, shm_perm);
149 }
150
151 /*
152  * shm_lock_(check_) routines are called in the paths where the rwsem
153  * is not necessarily held.
154  */
155 static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
156 {
157         struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);
158
159         /*
160          * Callers of shm_lock() must validate the status of the returned ipc
161          * object pointer (as returned by ipc_lock()), and error out as
162          * appropriate.
163          */
164         if (IS_ERR(ipcp))
165                 return (void *)ipcp;
166         return container_of(ipcp, struct shmid_kernel, shm_perm);
167 }
168
169 static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)
170 {
171         rcu_read_lock();
172         ipc_lock_object(&ipcp->shm_perm);
173 }
174
175 static void shm_rcu_free(struct rcu_head *head)
176 {
177         struct kern_ipc_perm *ptr = container_of(head, struct kern_ipc_perm,
178                                                         rcu);
179         struct shmid_kernel *shp = container_of(ptr, struct shmid_kernel,
180                                                         shm_perm);
181         security_shm_free(shp);
182         kvfree(shp);
183 }
184
185 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
186 {
187         list_del(&s->shm_clist);
188         ipc_rmid(&shm_ids(ns), &s->shm_perm);
189 }
190
191
192 static int __shm_open(struct vm_area_struct *vma)
193 {
194         struct file *file = vma->vm_file;
195         struct shm_file_data *sfd = shm_file_data(file);
196         struct shmid_kernel *shp;
197
198         shp = shm_lock(sfd->ns, sfd->id);
199
200         if (IS_ERR(shp))
201                 return PTR_ERR(shp);
202
203         shp->shm_atim = get_seconds();
204         shp->shm_lprid = task_tgid_vnr(current);
205         shp->shm_nattch++;
206         shm_unlock(shp);
207         return 0;
208 }
209
210 /* This is called by fork, once for every shm attach. */
211 static void shm_open(struct vm_area_struct *vma)
212 {
213         int err = __shm_open(vma);
214         /*
215          * We raced in the idr lookup or with shm_destroy().
216          * Either way, the ID is busted.
217          */
218         WARN_ON_ONCE(err);
219 }
220
221 /*
222  * shm_destroy - free the struct shmid_kernel
223  *
224  * @ns: namespace
225  * @shp: struct to free
226  *
227  * It has to be called with shp and shm_ids.rwsem (writer) locked,
228  * but returns with shp unlocked and freed.
229  */
230 static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
231 {
232         struct file *shm_file;
233
234         shm_file = shp->shm_file;
235         shp->shm_file = NULL;
236         ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
237         shm_rmid(ns, shp);
238         shm_unlock(shp);
239         if (!is_file_hugepages(shm_file))
240                 shmem_lock(shm_file, 0, shp->mlock_user);
241         else if (shp->mlock_user)
242                 user_shm_unlock(i_size_read(file_inode(shm_file)),
243                                 shp->mlock_user);
244         fput(shm_file);
245         ipc_rcu_putref(&shp->shm_perm, shm_rcu_free);
246 }
247
248 /*
249  * shm_may_destroy - identifies whether shm segment should be destroyed now
250  *
251  * Returns true if and only if there are no active users of the segment and
252  * one of the following is true:
253  *
254  * 1) shmctl(id, IPC_RMID, NULL) was called for this shp
255  *
256  * 2) sysctl kernel.shm_rmid_forced is set to 1.
257  */
258 static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
259 {
260         return (shp->shm_nattch == 0) &&
261                (ns->shm_rmid_forced ||
262                 (shp->shm_perm.mode & SHM_DEST));
263 }
264
265 /*
266  * remove the attach descriptor vma.
267  * free memory for segment if it is marked destroyed.
268  * The descriptor has already been removed from the current->mm->mmap list
269  * and will later be kfree()d.
270  */
271 static void shm_close(struct vm_area_struct *vma)
272 {
273         struct file *file = vma->vm_file;
274         struct shm_file_data *sfd = shm_file_data(file);
275         struct shmid_kernel *shp;
276         struct ipc_namespace *ns = sfd->ns;
277
278         down_write(&shm_ids(ns).rwsem);
279         /* remove from the list of attaches of the shm segment */
280         shp = shm_lock(ns, sfd->id);
281
282         /*
283          * We raced in the idr lookup or with shm_destroy().
284          * Either way, the ID is busted.
285          */
286         if (WARN_ON_ONCE(IS_ERR(shp)))
287                 goto done; /* no-op */
288
289         shp->shm_lprid = task_tgid_vnr(current);
290         shp->shm_dtim = get_seconds();
291         shp->shm_nattch--;
292         if (shm_may_destroy(ns, shp))
293                 shm_destroy(ns, shp);
294         else
295                 shm_unlock(shp);
296 done:
297         up_write(&shm_ids(ns).rwsem);
298 }
299
300 /* Called with ns->shm_ids(ns).rwsem locked */
301 static int shm_try_destroy_orphaned(int id, void *p, void *data)
302 {
303         struct ipc_namespace *ns = data;
304         struct kern_ipc_perm *ipcp = p;
305         struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
306
307         /*
308          * We want to destroy segments without users and with already
309          * exit'ed originating process.
310          *
311          * As shp->* are changed under rwsem, it's safe to skip shp locking.
312          */
313         if (shp->shm_creator != NULL)
314                 return 0;
315
316         if (shm_may_destroy(ns, shp)) {
317                 shm_lock_by_ptr(shp);
318                 shm_destroy(ns, shp);
319         }
320         return 0;
321 }
322
323 void shm_destroy_orphaned(struct ipc_namespace *ns)
324 {
325         down_write(&shm_ids(ns).rwsem);
326         if (shm_ids(ns).in_use)
327                 idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);
328         up_write(&shm_ids(ns).rwsem);
329 }
330
331 /* Locking assumes this will only be called with task == current */
332 void exit_shm(struct task_struct *task)
333 {
334         struct ipc_namespace *ns = task->nsproxy->ipc_ns;
335         struct shmid_kernel *shp, *n;
336
337         if (list_empty(&task->sysvshm.shm_clist))
338                 return;
339
340         /*
341          * If kernel.shm_rmid_forced is not set then only keep track of
342          * which shmids are orphaned, so that a later set of the sysctl
343          * can clean them up.
344          */
345         if (!ns->shm_rmid_forced) {
346                 down_read(&shm_ids(ns).rwsem);
347                 list_for_each_entry(shp, &task->sysvshm.shm_clist, shm_clist)
348                         shp->shm_creator = NULL;
349                 /*
350                  * Only under read lock but we are only called on current
351                  * so no entry on the list will be shared.
352                  */
353                 list_del(&task->sysvshm.shm_clist);
354                 up_read(&shm_ids(ns).rwsem);
355                 return;
356         }
357
358         /*
359          * Destroy all already created segments, that were not yet mapped,
360          * and mark any mapped as orphan to cover the sysctl toggling.
361          * Destroy is skipped if shm_may_destroy() returns false.
362          */
363         down_write(&shm_ids(ns).rwsem);
364         list_for_each_entry_safe(shp, n, &task->sysvshm.shm_clist, shm_clist) {
365                 shp->shm_creator = NULL;
366
367                 if (shm_may_destroy(ns, shp)) {
368                         shm_lock_by_ptr(shp);
369                         shm_destroy(ns, shp);
370                 }
371         }
372
373         /* Remove the list head from any segments still attached. */
374         list_del(&task->sysvshm.shm_clist);
375         up_write(&shm_ids(ns).rwsem);
376 }
377
378 static int shm_fault(struct vm_fault *vmf)
379 {
380         struct file *file = vmf->vma->vm_file;
381         struct shm_file_data *sfd = shm_file_data(file);
382
383         return sfd->vm_ops->fault(vmf);
384 }
385
386 #ifdef CONFIG_NUMA
387 static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
388 {
389         struct file *file = vma->vm_file;
390         struct shm_file_data *sfd = shm_file_data(file);
391         int err = 0;
392
393         if (sfd->vm_ops->set_policy)
394                 err = sfd->vm_ops->set_policy(vma, new);
395         return err;
396 }
397
398 static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
399                                         unsigned long addr)
400 {
401         struct file *file = vma->vm_file;
402         struct shm_file_data *sfd = shm_file_data(file);
403         struct mempolicy *pol = NULL;
404
405         if (sfd->vm_ops->get_policy)
406                 pol = sfd->vm_ops->get_policy(vma, addr);
407         else if (vma->vm_policy)
408                 pol = vma->vm_policy;
409
410         return pol;
411 }
412 #endif
413
414 static int shm_mmap(struct file *file, struct vm_area_struct *vma)
415 {
416         struct shm_file_data *sfd = shm_file_data(file);
417         int ret;
418
419         /*
420          * In case of remap_file_pages() emulation, the file can represent
421          * removed IPC ID: propogate shm_lock() error to caller.
422          */
423         ret = __shm_open(vma);
424         if (ret)
425                 return ret;
426
427         ret = call_mmap(sfd->file, vma);
428         if (ret) {
429                 shm_close(vma);
430                 return ret;
431         }
432         sfd->vm_ops = vma->vm_ops;
433 #ifdef CONFIG_MMU
434         WARN_ON(!sfd->vm_ops->fault);
435 #endif
436         vma->vm_ops = &shm_vm_ops;
437         return 0;
438 }
439
440 static int shm_release(struct inode *ino, struct file *file)
441 {
442         struct shm_file_data *sfd = shm_file_data(file);
443
444         put_ipc_ns(sfd->ns);
445         shm_file_data(file) = NULL;
446         kfree(sfd);
447         return 0;
448 }
449
450 static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
451 {
452         struct shm_file_data *sfd = shm_file_data(file);
453
454         if (!sfd->file->f_op->fsync)
455                 return -EINVAL;
456         return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
457 }
458
459 static long shm_fallocate(struct file *file, int mode, loff_t offset,
460                           loff_t len)
461 {
462         struct shm_file_data *sfd = shm_file_data(file);
463
464         if (!sfd->file->f_op->fallocate)
465                 return -EOPNOTSUPP;
466         return sfd->file->f_op->fallocate(file, mode, offset, len);
467 }
468
469 static unsigned long shm_get_unmapped_area(struct file *file,
470         unsigned long addr, unsigned long len, unsigned long pgoff,
471         unsigned long flags)
472 {
473         struct shm_file_data *sfd = shm_file_data(file);
474
475         return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
476                                                 pgoff, flags);
477 }
478
479 static const struct file_operations shm_file_operations = {
480         .mmap           = shm_mmap,
481         .fsync          = shm_fsync,
482         .release        = shm_release,
483         .get_unmapped_area      = shm_get_unmapped_area,
484         .llseek         = noop_llseek,
485         .fallocate      = shm_fallocate,
486 };
487
488 /*
489  * shm_file_operations_huge is now identical to shm_file_operations,
490  * but we keep it distinct for the sake of is_file_shm_hugepages().
491  */
492 static const struct file_operations shm_file_operations_huge = {
493         .mmap           = shm_mmap,
494         .fsync          = shm_fsync,
495         .release        = shm_release,
496         .get_unmapped_area      = shm_get_unmapped_area,
497         .llseek         = noop_llseek,
498         .fallocate      = shm_fallocate,
499 };
500
501 bool is_file_shm_hugepages(struct file *file)
502 {
503         return file->f_op == &shm_file_operations_huge;
504 }
505
506 static const struct vm_operations_struct shm_vm_ops = {
507         .open   = shm_open,     /* callback for a new vm-area open */
508         .close  = shm_close,    /* callback for when the vm-area is released */
509         .fault  = shm_fault,
510 #if defined(CONFIG_NUMA)
511         .set_policy = shm_set_policy,
512         .get_policy = shm_get_policy,
513 #endif
514 };
515
516 /**
517  * newseg - Create a new shared memory segment
518  * @ns: namespace
519  * @params: ptr to the structure that contains key, size and shmflg
520  *
521  * Called with shm_ids.rwsem held as a writer.
522  */
523 static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
524 {
525         key_t key = params->key;
526         int shmflg = params->flg;
527         size_t size = params->u.size;
528         int error;
529         struct shmid_kernel *shp;
530         size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
531         struct file *file;
532         char name[13];
533         vm_flags_t acctflag = 0;
534
535         if (size < SHMMIN || size > ns->shm_ctlmax)
536                 return -EINVAL;
537
538         if (numpages << PAGE_SHIFT < size)
539                 return -ENOSPC;
540
541         if (ns->shm_tot + numpages < ns->shm_tot ||
542                         ns->shm_tot + numpages > ns->shm_ctlall)
543                 return -ENOSPC;
544
545         shp = kvmalloc(sizeof(*shp), GFP_KERNEL);
546         if (unlikely(!shp))
547                 return -ENOMEM;
548
549         shp->shm_perm.key = key;
550         shp->shm_perm.mode = (shmflg & S_IRWXUGO);
551         shp->mlock_user = NULL;
552
553         shp->shm_perm.security = NULL;
554         error = security_shm_alloc(shp);
555         if (error) {
556                 kvfree(shp);
557                 return error;
558         }
559
560         sprintf(name, "SYSV%08x", key);
561         if (shmflg & SHM_HUGETLB) {
562                 struct hstate *hs;
563                 size_t hugesize;
564
565                 hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
566                 if (!hs) {
567                         error = -EINVAL;
568                         goto no_file;
569                 }
570                 hugesize = ALIGN(size, huge_page_size(hs));
571
572                 /* hugetlb_file_setup applies strict accounting */
573                 if (shmflg & SHM_NORESERVE)
574                         acctflag = VM_NORESERVE;
575                 file = hugetlb_file_setup(name, hugesize, acctflag,
576                                   &shp->mlock_user, HUGETLB_SHMFS_INODE,
577                                 (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
578         } else {
579                 /*
580                  * Do not allow no accounting for OVERCOMMIT_NEVER, even
581                  * if it's asked for.
582                  */
583                 if  ((shmflg & SHM_NORESERVE) &&
584                                 sysctl_overcommit_memory != OVERCOMMIT_NEVER)
585                         acctflag = VM_NORESERVE;
586                 file = shmem_kernel_file_setup(name, size, acctflag);
587         }
588         error = PTR_ERR(file);
589         if (IS_ERR(file))
590                 goto no_file;
591
592         shp->shm_cprid = task_tgid_vnr(current);
593         shp->shm_lprid = 0;
594         shp->shm_atim = shp->shm_dtim = 0;
595         shp->shm_ctim = get_seconds();
596         shp->shm_segsz = size;
597         shp->shm_nattch = 0;
598         shp->shm_file = file;
599         shp->shm_creator = current;
600
601         error = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
602         if (error < 0)
603                 goto no_id;
604
605         list_add(&shp->shm_clist, &current->sysvshm.shm_clist);
606
607         /*
608          * shmid gets reported as "inode#" in /proc/pid/maps.
609          * proc-ps tools use this. Changing this will break them.
610          */
611         file_inode(file)->i_ino = shp->shm_perm.id;
612
613         ns->shm_tot += numpages;
614         error = shp->shm_perm.id;
615
616         ipc_unlock_object(&shp->shm_perm);
617         rcu_read_unlock();
618         return error;
619
620 no_id:
621         if (is_file_hugepages(file) && shp->mlock_user)
622                 user_shm_unlock(size, shp->mlock_user);
623         fput(file);
624 no_file:
625         call_rcu(&shp->shm_perm.rcu, shm_rcu_free);
626         return error;
627 }
628
629 /*
630  * Called with shm_ids.rwsem and ipcp locked.
631  */
632 static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
633 {
634         struct shmid_kernel *shp;
635
636         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
637         return security_shm_associate(shp, shmflg);
638 }
639
640 /*
641  * Called with shm_ids.rwsem and ipcp locked.
642  */
643 static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
644                                 struct ipc_params *params)
645 {
646         struct shmid_kernel *shp;
647
648         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
649         if (shp->shm_segsz < params->u.size)
650                 return -EINVAL;
651
652         return 0;
653 }
654
655 SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
656 {
657         struct ipc_namespace *ns;
658         static const struct ipc_ops shm_ops = {
659                 .getnew = newseg,
660                 .associate = shm_security,
661                 .more_checks = shm_more_checks,
662         };
663         struct ipc_params shm_params;
664
665         ns = current->nsproxy->ipc_ns;
666
667         shm_params.key = key;
668         shm_params.flg = shmflg;
669         shm_params.u.size = size;
670
671         return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
672 }
673
674 static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
675 {
676         switch (version) {
677         case IPC_64:
678                 return copy_to_user(buf, in, sizeof(*in));
679         case IPC_OLD:
680             {
681                 struct shmid_ds out;
682
683                 memset(&out, 0, sizeof(out));
684                 ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
685                 out.shm_segsz   = in->shm_segsz;
686                 out.shm_atime   = in->shm_atime;
687                 out.shm_dtime   = in->shm_dtime;
688                 out.shm_ctime   = in->shm_ctime;
689                 out.shm_cpid    = in->shm_cpid;
690                 out.shm_lpid    = in->shm_lpid;
691                 out.shm_nattch  = in->shm_nattch;
692
693                 return copy_to_user(buf, &out, sizeof(out));
694             }
695         default:
696                 return -EINVAL;
697         }
698 }
699
700 static inline unsigned long
701 copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
702 {
703         switch (version) {
704         case IPC_64:
705                 if (copy_from_user(out, buf, sizeof(*out)))
706                         return -EFAULT;
707                 return 0;
708         case IPC_OLD:
709             {
710                 struct shmid_ds tbuf_old;
711
712                 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
713                         return -EFAULT;
714
715                 out->shm_perm.uid       = tbuf_old.shm_perm.uid;
716                 out->shm_perm.gid       = tbuf_old.shm_perm.gid;
717                 out->shm_perm.mode      = tbuf_old.shm_perm.mode;
718
719                 return 0;
720             }
721         default:
722                 return -EINVAL;
723         }
724 }
725
726 static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
727 {
728         switch (version) {
729         case IPC_64:
730                 return copy_to_user(buf, in, sizeof(*in));
731         case IPC_OLD:
732             {
733                 struct shminfo out;
734
735                 if (in->shmmax > INT_MAX)
736                         out.shmmax = INT_MAX;
737                 else
738                         out.shmmax = (int)in->shmmax;
739
740                 out.shmmin      = in->shmmin;
741                 out.shmmni      = in->shmmni;
742                 out.shmseg      = in->shmseg;
743                 out.shmall      = in->shmall;
744
745                 return copy_to_user(buf, &out, sizeof(out));
746             }
747         default:
748                 return -EINVAL;
749         }
750 }
751
752 /*
753  * Calculate and add used RSS and swap pages of a shm.
754  * Called with shm_ids.rwsem held as a reader
755  */
756 static void shm_add_rss_swap(struct shmid_kernel *shp,
757         unsigned long *rss_add, unsigned long *swp_add)
758 {
759         struct inode *inode;
760
761         inode = file_inode(shp->shm_file);
762
763         if (is_file_hugepages(shp->shm_file)) {
764                 struct address_space *mapping = inode->i_mapping;
765                 struct hstate *h = hstate_file(shp->shm_file);
766                 *rss_add += pages_per_huge_page(h) * mapping->nrpages;
767         } else {
768 #ifdef CONFIG_SHMEM
769                 struct shmem_inode_info *info = SHMEM_I(inode);
770
771                 spin_lock_irq(&info->lock);
772                 *rss_add += inode->i_mapping->nrpages;
773                 *swp_add += info->swapped;
774                 spin_unlock_irq(&info->lock);
775 #else
776                 *rss_add += inode->i_mapping->nrpages;
777 #endif
778         }
779 }
780
781 /*
782  * Called with shm_ids.rwsem held as a reader
783  */
784 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
785                 unsigned long *swp)
786 {
787         int next_id;
788         int total, in_use;
789
790         *rss = 0;
791         *swp = 0;
792
793         in_use = shm_ids(ns).in_use;
794
795         for (total = 0, next_id = 0; total < in_use; next_id++) {
796                 struct kern_ipc_perm *ipc;
797                 struct shmid_kernel *shp;
798
799                 ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
800                 if (ipc == NULL)
801                         continue;
802                 shp = container_of(ipc, struct shmid_kernel, shm_perm);
803
804                 shm_add_rss_swap(shp, rss, swp);
805
806                 total++;
807         }
808 }
809
810 /*
811  * This function handles some shmctl commands which require the rwsem
812  * to be held in write mode.
813  * NOTE: no locks must be held, the rwsem is taken inside this function.
814  */
815 static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
816                        struct shmid_ds __user *buf, int version)
817 {
818         struct kern_ipc_perm *ipcp;
819         struct shmid64_ds shmid64;
820         struct shmid_kernel *shp;
821         int err;
822
823         if (cmd == IPC_SET) {
824                 if (copy_shmid_from_user(&shmid64, buf, version))
825                         return -EFAULT;
826         }
827
828         down_write(&shm_ids(ns).rwsem);
829         rcu_read_lock();
830
831         ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd,
832                                       &shmid64.shm_perm, 0);
833         if (IS_ERR(ipcp)) {
834                 err = PTR_ERR(ipcp);
835                 goto out_unlock1;
836         }
837
838         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
839
840         err = security_shm_shmctl(shp, cmd);
841         if (err)
842                 goto out_unlock1;
843
844         switch (cmd) {
845         case IPC_RMID:
846                 ipc_lock_object(&shp->shm_perm);
847                 /* do_shm_rmid unlocks the ipc object and rcu */
848                 do_shm_rmid(ns, ipcp);
849                 goto out_up;
850         case IPC_SET:
851                 ipc_lock_object(&shp->shm_perm);
852                 err = ipc_update_perm(&shmid64.shm_perm, ipcp);
853                 if (err)
854                         goto out_unlock0;
855                 shp->shm_ctim = get_seconds();
856                 break;
857         default:
858                 err = -EINVAL;
859                 goto out_unlock1;
860         }
861
862 out_unlock0:
863         ipc_unlock_object(&shp->shm_perm);
864 out_unlock1:
865         rcu_read_unlock();
866 out_up:
867         up_write(&shm_ids(ns).rwsem);
868         return err;
869 }
870
871 static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
872                          int cmd, int version, void __user *buf)
873 {
874         int err;
875         struct shmid_kernel *shp;
876
877         /* preliminary security checks for *_INFO */
878         if (cmd == IPC_INFO || cmd == SHM_INFO) {
879                 err = security_shm_shmctl(NULL, cmd);
880                 if (err)
881                         return err;
882         }
883
884         switch (cmd) {
885         case IPC_INFO:
886         {
887                 struct shminfo64 shminfo;
888
889                 memset(&shminfo, 0, sizeof(shminfo));
890                 shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
891                 shminfo.shmmax = ns->shm_ctlmax;
892                 shminfo.shmall = ns->shm_ctlall;
893
894                 shminfo.shmmin = SHMMIN;
895                 if (copy_shminfo_to_user(buf, &shminfo, version))
896                         return -EFAULT;
897
898                 down_read(&shm_ids(ns).rwsem);
899                 err = ipc_get_maxid(&shm_ids(ns));
900                 up_read(&shm_ids(ns).rwsem);
901
902                 if (err < 0)
903                         err = 0;
904                 goto out;
905         }
906         case SHM_INFO:
907         {
908                 struct shm_info shm_info;
909
910                 memset(&shm_info, 0, sizeof(shm_info));
911                 down_read(&shm_ids(ns).rwsem);
912                 shm_info.used_ids = shm_ids(ns).in_use;
913                 shm_get_stat(ns, &shm_info.shm_rss, &shm_info.shm_swp);
914                 shm_info.shm_tot = ns->shm_tot;
915                 shm_info.swap_attempts = 0;
916                 shm_info.swap_successes = 0;
917                 err = ipc_get_maxid(&shm_ids(ns));
918                 up_read(&shm_ids(ns).rwsem);
919                 if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
920                         err = -EFAULT;
921                         goto out;
922                 }
923
924                 err = err < 0 ? 0 : err;
925                 goto out;
926         }
927         case SHM_STAT:
928         case IPC_STAT:
929         {
930                 struct shmid64_ds tbuf;
931                 int result;
932
933                 rcu_read_lock();
934                 if (cmd == SHM_STAT) {
935                         shp = shm_obtain_object(ns, shmid);
936                         if (IS_ERR(shp)) {
937                                 err = PTR_ERR(shp);
938                                 goto out_unlock;
939                         }
940                         result = shp->shm_perm.id;
941                 } else {
942                         shp = shm_obtain_object_check(ns, shmid);
943                         if (IS_ERR(shp)) {
944                                 err = PTR_ERR(shp);
945                                 goto out_unlock;
946                         }
947                         result = 0;
948                 }
949
950                 err = -EACCES;
951                 if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
952                         goto out_unlock;
953
954                 err = security_shm_shmctl(shp, cmd);
955                 if (err)
956                         goto out_unlock;
957
958                 memset(&tbuf, 0, sizeof(tbuf));
959                 kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
960                 tbuf.shm_segsz  = shp->shm_segsz;
961                 tbuf.shm_atime  = shp->shm_atim;
962                 tbuf.shm_dtime  = shp->shm_dtim;
963                 tbuf.shm_ctime  = shp->shm_ctim;
964                 tbuf.shm_cpid   = shp->shm_cprid;
965                 tbuf.shm_lpid   = shp->shm_lprid;
966                 tbuf.shm_nattch = shp->shm_nattch;
967                 rcu_read_unlock();
968
969                 if (copy_shmid_to_user(buf, &tbuf, version))
970                         err = -EFAULT;
971                 else
972                         err = result;
973                 goto out;
974         }
975         default:
976                 return -EINVAL;
977         }
978
979 out_unlock:
980         rcu_read_unlock();
981 out:
982         return err;
983 }
984
985 SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
986 {
987         struct shmid_kernel *shp;
988         int err, version;
989         struct ipc_namespace *ns;
990
991         if (cmd < 0 || shmid < 0)
992                 return -EINVAL;
993
994         version = ipc_parse_version(&cmd);
995         ns = current->nsproxy->ipc_ns;
996
997         switch (cmd) {
998         case IPC_INFO:
999         case SHM_INFO:
1000         case SHM_STAT:
1001         case IPC_STAT:
1002                 return shmctl_nolock(ns, shmid, cmd, version, buf);
1003         case IPC_RMID:
1004         case IPC_SET:
1005                 return shmctl_down(ns, shmid, cmd, buf, version);
1006         case SHM_LOCK:
1007         case SHM_UNLOCK:
1008         {
1009                 struct file *shm_file;
1010
1011                 rcu_read_lock();
1012                 shp = shm_obtain_object_check(ns, shmid);
1013                 if (IS_ERR(shp)) {
1014                         err = PTR_ERR(shp);
1015                         goto out_unlock1;
1016                 }
1017
1018                 audit_ipc_obj(&(shp->shm_perm));
1019                 err = security_shm_shmctl(shp, cmd);
1020                 if (err)
1021                         goto out_unlock1;
1022
1023                 ipc_lock_object(&shp->shm_perm);
1024
1025                 /* check if shm_destroy() is tearing down shp */
1026                 if (!ipc_valid_object(&shp->shm_perm)) {
1027                         err = -EIDRM;
1028                         goto out_unlock0;
1029                 }
1030
1031                 if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
1032                         kuid_t euid = current_euid();
1033
1034                         if (!uid_eq(euid, shp->shm_perm.uid) &&
1035                             !uid_eq(euid, shp->shm_perm.cuid)) {
1036                                 err = -EPERM;
1037                                 goto out_unlock0;
1038                         }
1039                         if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) {
1040                                 err = -EPERM;
1041                                 goto out_unlock0;
1042                         }
1043                 }
1044
1045                 shm_file = shp->shm_file;
1046                 if (is_file_hugepages(shm_file))
1047                         goto out_unlock0;
1048
1049                 if (cmd == SHM_LOCK) {
1050                         struct user_struct *user = current_user();
1051
1052                         err = shmem_lock(shm_file, 1, user);
1053                         if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
1054                                 shp->shm_perm.mode |= SHM_LOCKED;
1055                                 shp->mlock_user = user;
1056                         }
1057                         goto out_unlock0;
1058                 }
1059
1060                 /* SHM_UNLOCK */
1061                 if (!(shp->shm_perm.mode & SHM_LOCKED))
1062                         goto out_unlock0;
1063                 shmem_lock(shm_file, 0, shp->mlock_user);
1064                 shp->shm_perm.mode &= ~SHM_LOCKED;
1065                 shp->mlock_user = NULL;
1066                 get_file(shm_file);
1067                 ipc_unlock_object(&shp->shm_perm);
1068                 rcu_read_unlock();
1069                 shmem_unlock_mapping(shm_file->f_mapping);
1070
1071                 fput(shm_file);
1072                 return err;
1073         }
1074         default:
1075                 return -EINVAL;
1076         }
1077
1078 out_unlock0:
1079         ipc_unlock_object(&shp->shm_perm);
1080 out_unlock1:
1081         rcu_read_unlock();
1082         return err;
1083 }
1084
1085 /*
1086  * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
1087  *
1088  * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
1089  * "raddr" thing points to kernel space, and there has to be a wrapper around
1090  * this.
1091  */
1092 long do_shmat(int shmid, char __user *shmaddr, int shmflg,
1093               ulong *raddr, unsigned long shmlba)
1094 {
1095         struct shmid_kernel *shp;
1096         unsigned long addr = (unsigned long)shmaddr;
1097         unsigned long size;
1098         struct file *file;
1099         int    err;
1100         unsigned long flags = MAP_SHARED;
1101         unsigned long prot;
1102         int acc_mode;
1103         struct ipc_namespace *ns;
1104         struct shm_file_data *sfd;
1105         struct path path;
1106         fmode_t f_mode;
1107         unsigned long populate = 0;
1108
1109         err = -EINVAL;
1110         if (shmid < 0)
1111                 goto out;
1112
1113         if (addr) {
1114                 if (addr & (shmlba - 1)) {
1115                         /*
1116                          * Round down to the nearest multiple of shmlba.
1117                          * For sane do_mmap_pgoff() parameters, avoid
1118                          * round downs that trigger nil-page and MAP_FIXED.
1119                          */
1120                         if ((shmflg & SHM_RND) && addr >= shmlba)
1121                                 addr &= ~(shmlba - 1);
1122                         else
1123 #ifndef __ARCH_FORCE_SHMLBA
1124                                 if (addr & ~PAGE_MASK)
1125 #endif
1126                                         goto out;
1127                 }
1128
1129                 flags |= MAP_FIXED;
1130         } else if ((shmflg & SHM_REMAP))
1131                 goto out;
1132
1133         if (shmflg & SHM_RDONLY) {
1134                 prot = PROT_READ;
1135                 acc_mode = S_IRUGO;
1136                 f_mode = FMODE_READ;
1137         } else {
1138                 prot = PROT_READ | PROT_WRITE;
1139                 acc_mode = S_IRUGO | S_IWUGO;
1140                 f_mode = FMODE_READ | FMODE_WRITE;
1141         }
1142         if (shmflg & SHM_EXEC) {
1143                 prot |= PROT_EXEC;
1144                 acc_mode |= S_IXUGO;
1145         }
1146
1147         /*
1148          * We cannot rely on the fs check since SYSV IPC does have an
1149          * additional creator id...
1150          */
1151         ns = current->nsproxy->ipc_ns;
1152         rcu_read_lock();
1153         shp = shm_obtain_object_check(ns, shmid);
1154         if (IS_ERR(shp)) {
1155                 err = PTR_ERR(shp);
1156                 goto out_unlock;
1157         }
1158
1159         err = -EACCES;
1160         if (ipcperms(ns, &shp->shm_perm, acc_mode))
1161                 goto out_unlock;
1162
1163         err = security_shm_shmat(shp, shmaddr, shmflg);
1164         if (err)
1165                 goto out_unlock;
1166
1167         ipc_lock_object(&shp->shm_perm);
1168
1169         /* check if shm_destroy() is tearing down shp */
1170         if (!ipc_valid_object(&shp->shm_perm)) {
1171                 ipc_unlock_object(&shp->shm_perm);
1172                 err = -EIDRM;
1173                 goto out_unlock;
1174         }
1175
1176         path = shp->shm_file->f_path;
1177         path_get(&path);
1178         shp->shm_nattch++;
1179         size = i_size_read(d_inode(path.dentry));
1180         ipc_unlock_object(&shp->shm_perm);
1181         rcu_read_unlock();
1182
1183         err = -ENOMEM;
1184         sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
1185         if (!sfd) {
1186                 path_put(&path);
1187                 goto out_nattch;
1188         }
1189
1190         file = alloc_file(&path, f_mode,
1191                           is_file_hugepages(shp->shm_file) ?
1192                                 &shm_file_operations_huge :
1193                                 &shm_file_operations);
1194         err = PTR_ERR(file);
1195         if (IS_ERR(file)) {
1196                 kfree(sfd);
1197                 path_put(&path);
1198                 goto out_nattch;
1199         }
1200
1201         file->private_data = sfd;
1202         file->f_mapping = shp->shm_file->f_mapping;
1203         sfd->id = shp->shm_perm.id;
1204         sfd->ns = get_ipc_ns(ns);
1205         sfd->file = shp->shm_file;
1206         sfd->vm_ops = NULL;
1207
1208         err = security_mmap_file(file, prot, flags);
1209         if (err)
1210                 goto out_fput;
1211
1212         if (down_write_killable(&current->mm->mmap_sem)) {
1213                 err = -EINTR;
1214                 goto out_fput;
1215         }
1216
1217         if (addr && !(shmflg & SHM_REMAP)) {
1218                 err = -EINVAL;
1219                 if (addr + size < addr)
1220                         goto invalid;
1221
1222                 if (find_vma_intersection(current->mm, addr, addr + size))
1223                         goto invalid;
1224         }
1225
1226         addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate, NULL);
1227         *raddr = addr;
1228         err = 0;
1229         if (IS_ERR_VALUE(addr))
1230                 err = (long)addr;
1231 invalid:
1232         up_write(&current->mm->mmap_sem);
1233         if (populate)
1234                 mm_populate(addr, populate);
1235
1236 out_fput:
1237         fput(file);
1238
1239 out_nattch:
1240         down_write(&shm_ids(ns).rwsem);
1241         shp = shm_lock(ns, shmid);
1242         shp->shm_nattch--;
1243         if (shm_may_destroy(ns, shp))
1244                 shm_destroy(ns, shp);
1245         else
1246                 shm_unlock(shp);
1247         up_write(&shm_ids(ns).rwsem);
1248         return err;
1249
1250 out_unlock:
1251         rcu_read_unlock();
1252 out:
1253         return err;
1254 }
1255
1256 SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
1257 {
1258         unsigned long ret;
1259         long err;
1260
1261         err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
1262         if (err)
1263                 return err;
1264         force_successful_syscall_return();
1265         return (long)ret;
1266 }
1267
1268 /*
1269  * detach and kill segment if marked destroyed.
1270  * The work is done in shm_close.
1271  */
1272 SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
1273 {
1274         struct mm_struct *mm = current->mm;
1275         struct vm_area_struct *vma;
1276         unsigned long addr = (unsigned long)shmaddr;
1277         int retval = -EINVAL;
1278 #ifdef CONFIG_MMU
1279         loff_t size = 0;
1280         struct file *file;
1281         struct vm_area_struct *next;
1282 #endif
1283
1284         if (addr & ~PAGE_MASK)
1285                 return retval;
1286
1287         if (down_write_killable(&mm->mmap_sem))
1288                 return -EINTR;
1289
1290         /*
1291          * This function tries to be smart and unmap shm segments that
1292          * were modified by partial mlock or munmap calls:
1293          * - It first determines the size of the shm segment that should be
1294          *   unmapped: It searches for a vma that is backed by shm and that
1295          *   started at address shmaddr. It records it's size and then unmaps
1296          *   it.
1297          * - Then it unmaps all shm vmas that started at shmaddr and that
1298          *   are within the initially determined size and that are from the
1299          *   same shm segment from which we determined the size.
1300          * Errors from do_munmap are ignored: the function only fails if
1301          * it's called with invalid parameters or if it's called to unmap
1302          * a part of a vma. Both calls in this function are for full vmas,
1303          * the parameters are directly copied from the vma itself and always
1304          * valid - therefore do_munmap cannot fail. (famous last words?)
1305          */
1306         /*
1307          * If it had been mremap()'d, the starting address would not
1308          * match the usual checks anyway. So assume all vma's are
1309          * above the starting address given.
1310          */
1311         vma = find_vma(mm, addr);
1312
1313 #ifdef CONFIG_MMU
1314         while (vma) {
1315                 next = vma->vm_next;
1316
1317                 /*
1318                  * Check if the starting address would match, i.e. it's
1319                  * a fragment created by mprotect() and/or munmap(), or it
1320                  * otherwise it starts at this address with no hassles.
1321                  */
1322                 if ((vma->vm_ops == &shm_vm_ops) &&
1323                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
1324
1325                         /*
1326                          * Record the file of the shm segment being
1327                          * unmapped.  With mremap(), someone could place
1328                          * page from another segment but with equal offsets
1329                          * in the range we are unmapping.
1330                          */
1331                         file = vma->vm_file;
1332                         size = i_size_read(file_inode(vma->vm_file));
1333                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
1334                         /*
1335                          * We discovered the size of the shm segment, so
1336                          * break out of here and fall through to the next
1337                          * loop that uses the size information to stop
1338                          * searching for matching vma's.
1339                          */
1340                         retval = 0;
1341                         vma = next;
1342                         break;
1343                 }
1344                 vma = next;
1345         }
1346
1347         /*
1348          * We need look no further than the maximum address a fragment
1349          * could possibly have landed at. Also cast things to loff_t to
1350          * prevent overflows and make comparisons vs. equal-width types.
1351          */
1352         size = PAGE_ALIGN(size);
1353         while (vma && (loff_t)(vma->vm_end - addr) <= size) {
1354                 next = vma->vm_next;
1355
1356                 /* finding a matching vma now does not alter retval */
1357                 if ((vma->vm_ops == &shm_vm_ops) &&
1358                     ((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) &&
1359                     (vma->vm_file == file))
1360                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
1361                 vma = next;
1362         }
1363
1364 #else   /* CONFIG_MMU */
1365         /* under NOMMU conditions, the exact address to be destroyed must be
1366          * given
1367          */
1368         if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
1369                 do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start, NULL);
1370                 retval = 0;
1371         }
1372
1373 #endif
1374
1375         up_write(&mm->mmap_sem);
1376         return retval;
1377 }
1378
1379 #ifdef CONFIG_PROC_FS
1380 static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
1381 {
1382         struct user_namespace *user_ns = seq_user_ns(s);
1383         struct shmid_kernel *shp = it;
1384         unsigned long rss = 0, swp = 0;
1385
1386         shm_add_rss_swap(shp, &rss, &swp);
1387
1388 #if BITS_PER_LONG <= 32
1389 #define SIZE_SPEC "%10lu"
1390 #else
1391 #define SIZE_SPEC "%21lu"
1392 #endif
1393
1394         seq_printf(s,
1395                    "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
1396                    "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
1397                    SIZE_SPEC " " SIZE_SPEC "\n",
1398                    shp->shm_perm.key,
1399                    shp->shm_perm.id,
1400                    shp->shm_perm.mode,
1401                    shp->shm_segsz,
1402                    shp->shm_cprid,
1403                    shp->shm_lprid,
1404                    shp->shm_nattch,
1405                    from_kuid_munged(user_ns, shp->shm_perm.uid),
1406                    from_kgid_munged(user_ns, shp->shm_perm.gid),
1407                    from_kuid_munged(user_ns, shp->shm_perm.cuid),
1408                    from_kgid_munged(user_ns, shp->shm_perm.cgid),
1409                    shp->shm_atim,
1410                    shp->shm_dtim,
1411                    shp->shm_ctim,
1412                    rss * PAGE_SIZE,
1413                    swp * PAGE_SIZE);
1414
1415         return 0;
1416 }
1417 #endif