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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 
shm_init_ns(struct ipc_namespace * ns)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  */
do_shm_rmid(struct ipc_namespace * ns,struct kern_ipc_perm * ipcp)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
shm_exit_ns(struct ipc_namespace * 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 
ipc_ns_init(void)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 
shm_init(void)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  */
shm_lock(struct ipc_namespace * ns,int id)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 
shm_lock_by_ptr(struct shmid_kernel * ipcp)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 
shm_lock_check(struct ipc_namespace * ns,int id)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 
shm_rcu_free(struct rcu_head * head)158 static void shm_rcu_free(struct rcu_head *head)
159 {
160 	struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu);
161 	struct shmid_kernel *shp = ipc_rcu_to_struct(p);
162 
163 	security_shm_free(shp);
164 	ipc_rcu_free(head);
165 }
166 
shm_rmid(struct ipc_namespace * ns,struct shmid_kernel * s)167 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
168 {
169 	ipc_rmid(&shm_ids(ns), &s->shm_perm);
170 }
171 
172 
173 /* This is called by fork, once for every shm attach. */
shm_open(struct vm_area_struct * vma)174 static void shm_open(struct vm_area_struct *vma)
175 {
176 	struct file *file = vma->vm_file;
177 	struct shm_file_data *sfd = shm_file_data(file);
178 	struct shmid_kernel *shp;
179 
180 	shp = shm_lock(sfd->ns, sfd->id);
181 	BUG_ON(IS_ERR(shp));
182 	shp->shm_atim = get_seconds();
183 	shp->shm_lprid = task_tgid_vnr(current);
184 	shp->shm_nattch++;
185 	shm_unlock(shp);
186 }
187 
188 /*
189  * shm_destroy - free the struct shmid_kernel
190  *
191  * @ns: namespace
192  * @shp: struct to free
193  *
194  * It has to be called with shp and shm_ids.rw_mutex (writer) locked,
195  * but returns with shp unlocked and freed.
196  */
shm_destroy(struct ipc_namespace * ns,struct shmid_kernel * shp)197 static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
198 {
199 	ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
200 	shm_rmid(ns, shp);
201 	shm_unlock(shp);
202 	if (!is_file_hugepages(shp->shm_file))
203 		shmem_lock(shp->shm_file, 0, shp->mlock_user);
204 	else if (shp->mlock_user)
205 		user_shm_unlock(file_inode(shp->shm_file)->i_size,
206 						shp->mlock_user);
207 	fput (shp->shm_file);
208 	ipc_rcu_putref(shp, shm_rcu_free);
209 }
210 
211 /*
212  * shm_may_destroy - identifies whether shm segment should be destroyed now
213  *
214  * Returns true if and only if there are no active users of the segment and
215  * one of the following is true:
216  *
217  * 1) shmctl(id, IPC_RMID, NULL) was called for this shp
218  *
219  * 2) sysctl kernel.shm_rmid_forced is set to 1.
220  */
shm_may_destroy(struct ipc_namespace * ns,struct shmid_kernel * shp)221 static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
222 {
223 	return (shp->shm_nattch == 0) &&
224 	       (ns->shm_rmid_forced ||
225 		(shp->shm_perm.mode & SHM_DEST));
226 }
227 
228 /*
229  * remove the attach descriptor vma.
230  * free memory for segment if it is marked destroyed.
231  * The descriptor has already been removed from the current->mm->mmap list
232  * and will later be kfree()d.
233  */
shm_close(struct vm_area_struct * vma)234 static void shm_close(struct vm_area_struct *vma)
235 {
236 	struct file * file = vma->vm_file;
237 	struct shm_file_data *sfd = shm_file_data(file);
238 	struct shmid_kernel *shp;
239 	struct ipc_namespace *ns = sfd->ns;
240 
241 	down_write(&shm_ids(ns).rw_mutex);
242 	/* remove from the list of attaches of the shm segment */
243 	shp = shm_lock(ns, sfd->id);
244 	BUG_ON(IS_ERR(shp));
245 	shp->shm_lprid = task_tgid_vnr(current);
246 	shp->shm_dtim = get_seconds();
247 	shp->shm_nattch--;
248 	if (shm_may_destroy(ns, shp))
249 		shm_destroy(ns, shp);
250 	else
251 		shm_unlock(shp);
252 	up_write(&shm_ids(ns).rw_mutex);
253 }
254 
255 /* Called with ns->shm_ids(ns).rw_mutex locked */
shm_try_destroy_current(int id,void * p,void * data)256 static int shm_try_destroy_current(int id, void *p, void *data)
257 {
258 	struct ipc_namespace *ns = data;
259 	struct kern_ipc_perm *ipcp = p;
260 	struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
261 
262 	if (shp->shm_creator != current)
263 		return 0;
264 
265 	/*
266 	 * Mark it as orphaned to destroy the segment when
267 	 * kernel.shm_rmid_forced is changed.
268 	 * It is noop if the following shm_may_destroy() returns true.
269 	 */
270 	shp->shm_creator = NULL;
271 
272 	/*
273 	 * Don't even try to destroy it.  If shm_rmid_forced=0 and IPC_RMID
274 	 * is not set, it shouldn't be deleted here.
275 	 */
276 	if (!ns->shm_rmid_forced)
277 		return 0;
278 
279 	if (shm_may_destroy(ns, shp)) {
280 		shm_lock_by_ptr(shp);
281 		shm_destroy(ns, shp);
282 	}
283 	return 0;
284 }
285 
286 /* Called with ns->shm_ids(ns).rw_mutex locked */
shm_try_destroy_orphaned(int id,void * p,void * data)287 static int shm_try_destroy_orphaned(int id, void *p, void *data)
288 {
289 	struct ipc_namespace *ns = data;
290 	struct kern_ipc_perm *ipcp = p;
291 	struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
292 
293 	/*
294 	 * We want to destroy segments without users and with already
295 	 * exit'ed originating process.
296 	 *
297 	 * As shp->* are changed under rw_mutex, it's safe to skip shp locking.
298 	 */
299 	if (shp->shm_creator != NULL)
300 		return 0;
301 
302 	if (shm_may_destroy(ns, shp)) {
303 		shm_lock_by_ptr(shp);
304 		shm_destroy(ns, shp);
305 	}
306 	return 0;
307 }
308 
shm_destroy_orphaned(struct ipc_namespace * ns)309 void shm_destroy_orphaned(struct ipc_namespace *ns)
310 {
311 	down_write(&shm_ids(ns).rw_mutex);
312 	if (shm_ids(ns).in_use)
313 		idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);
314 	up_write(&shm_ids(ns).rw_mutex);
315 }
316 
317 
exit_shm(struct task_struct * task)318 void exit_shm(struct task_struct *task)
319 {
320 	struct ipc_namespace *ns = task->nsproxy->ipc_ns;
321 
322 	if (shm_ids(ns).in_use == 0)
323 		return;
324 
325 	/* Destroy all already created segments, but not mapped yet */
326 	down_write(&shm_ids(ns).rw_mutex);
327 	if (shm_ids(ns).in_use)
328 		idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_current, ns);
329 	up_write(&shm_ids(ns).rw_mutex);
330 }
331 
shm_fault(struct vm_area_struct * vma,struct vm_fault * vmf)332 static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
333 {
334 	struct file *file = vma->vm_file;
335 	struct shm_file_data *sfd = shm_file_data(file);
336 
337 	return sfd->vm_ops->fault(vma, vmf);
338 }
339 
340 #ifdef CONFIG_NUMA
shm_set_policy(struct vm_area_struct * vma,struct mempolicy * new)341 static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
342 {
343 	struct file *file = vma->vm_file;
344 	struct shm_file_data *sfd = shm_file_data(file);
345 	int err = 0;
346 	if (sfd->vm_ops->set_policy)
347 		err = sfd->vm_ops->set_policy(vma, new);
348 	return err;
349 }
350 
shm_get_policy(struct vm_area_struct * vma,unsigned long addr)351 static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
352 					unsigned long addr)
353 {
354 	struct file *file = vma->vm_file;
355 	struct shm_file_data *sfd = shm_file_data(file);
356 	struct mempolicy *pol = NULL;
357 
358 	if (sfd->vm_ops->get_policy)
359 		pol = sfd->vm_ops->get_policy(vma, addr);
360 	else if (vma->vm_policy)
361 		pol = vma->vm_policy;
362 
363 	return pol;
364 }
365 #endif
366 
shm_mmap(struct file * file,struct vm_area_struct * vma)367 static int shm_mmap(struct file * file, struct vm_area_struct * vma)
368 {
369 	struct shm_file_data *sfd = shm_file_data(file);
370 	int ret;
371 
372 	ret = sfd->file->f_op->mmap(sfd->file, vma);
373 	if (ret != 0)
374 		return ret;
375 	sfd->vm_ops = vma->vm_ops;
376 #ifdef CONFIG_MMU
377 	BUG_ON(!sfd->vm_ops->fault);
378 #endif
379 	vma->vm_ops = &shm_vm_ops;
380 	shm_open(vma);
381 
382 	return ret;
383 }
384 
shm_release(struct inode * ino,struct file * file)385 static int shm_release(struct inode *ino, struct file *file)
386 {
387 	struct shm_file_data *sfd = shm_file_data(file);
388 
389 	put_ipc_ns(sfd->ns);
390 	shm_file_data(file) = NULL;
391 	kfree(sfd);
392 	return 0;
393 }
394 
shm_fsync(struct file * file,loff_t start,loff_t end,int datasync)395 static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
396 {
397 	struct shm_file_data *sfd = shm_file_data(file);
398 
399 	if (!sfd->file->f_op->fsync)
400 		return -EINVAL;
401 	return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
402 }
403 
shm_fallocate(struct file * file,int mode,loff_t offset,loff_t len)404 static long shm_fallocate(struct file *file, int mode, loff_t offset,
405 			  loff_t len)
406 {
407 	struct shm_file_data *sfd = shm_file_data(file);
408 
409 	if (!sfd->file->f_op->fallocate)
410 		return -EOPNOTSUPP;
411 	return sfd->file->f_op->fallocate(file, mode, offset, len);
412 }
413 
shm_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)414 static unsigned long shm_get_unmapped_area(struct file *file,
415 	unsigned long addr, unsigned long len, unsigned long pgoff,
416 	unsigned long flags)
417 {
418 	struct shm_file_data *sfd = shm_file_data(file);
419 	return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
420 						pgoff, flags);
421 }
422 
423 static const struct file_operations shm_file_operations = {
424 	.mmap		= shm_mmap,
425 	.fsync		= shm_fsync,
426 	.release	= shm_release,
427 #ifndef CONFIG_MMU
428 	.get_unmapped_area	= shm_get_unmapped_area,
429 #endif
430 	.llseek		= noop_llseek,
431 	.fallocate	= shm_fallocate,
432 };
433 
434 static const struct file_operations shm_file_operations_huge = {
435 	.mmap		= shm_mmap,
436 	.fsync		= shm_fsync,
437 	.release	= shm_release,
438 	.get_unmapped_area	= shm_get_unmapped_area,
439 	.llseek		= noop_llseek,
440 	.fallocate	= shm_fallocate,
441 };
442 
is_file_shm_hugepages(struct file * file)443 int is_file_shm_hugepages(struct file *file)
444 {
445 	return file->f_op == &shm_file_operations_huge;
446 }
447 
448 static const struct vm_operations_struct shm_vm_ops = {
449 	.open	= shm_open,	/* callback for a new vm-area open */
450 	.close	= shm_close,	/* callback for when the vm-area is released */
451 	.fault	= shm_fault,
452 #if defined(CONFIG_NUMA)
453 	.set_policy = shm_set_policy,
454 	.get_policy = shm_get_policy,
455 #endif
456 };
457 
458 /**
459  * newseg - Create a new shared memory segment
460  * @ns: namespace
461  * @params: ptr to the structure that contains key, size and shmflg
462  *
463  * Called with shm_ids.rw_mutex held as a writer.
464  */
465 
newseg(struct ipc_namespace * ns,struct ipc_params * params)466 static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
467 {
468 	key_t key = params->key;
469 	int shmflg = params->flg;
470 	size_t size = params->u.size;
471 	int error;
472 	struct shmid_kernel *shp;
473 	size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
474 	struct file * file;
475 	char name[13];
476 	int id;
477 	vm_flags_t acctflag = 0;
478 
479 	if (size < SHMMIN || size > ns->shm_ctlmax)
480 		return -EINVAL;
481 
482 	if (ns->shm_tot + numpages > ns->shm_ctlall)
483 		return -ENOSPC;
484 
485 	shp = ipc_rcu_alloc(sizeof(*shp));
486 	if (!shp)
487 		return -ENOMEM;
488 
489 	shp->shm_perm.key = key;
490 	shp->shm_perm.mode = (shmflg & S_IRWXUGO);
491 	shp->mlock_user = NULL;
492 
493 	shp->shm_perm.security = NULL;
494 	error = security_shm_alloc(shp);
495 	if (error) {
496 		ipc_rcu_putref(shp, ipc_rcu_free);
497 		return error;
498 	}
499 
500 	sprintf (name, "SYSV%08x", key);
501 	if (shmflg & SHM_HUGETLB) {
502 		struct hstate *hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT)
503 						& SHM_HUGE_MASK);
504 		size_t hugesize;
505 
506 		if (!hs) {
507 			error = -EINVAL;
508 			goto no_file;
509 		}
510 		hugesize = ALIGN(size, huge_page_size(hs));
511 
512 		/* hugetlb_file_setup applies strict accounting */
513 		if (shmflg & SHM_NORESERVE)
514 			acctflag = VM_NORESERVE;
515 		file = hugetlb_file_setup(name, hugesize, acctflag,
516 				  &shp->mlock_user, HUGETLB_SHMFS_INODE,
517 				(shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
518 	} else {
519 		/*
520 		 * Do not allow no accounting for OVERCOMMIT_NEVER, even
521 	 	 * if it's asked for.
522 		 */
523 		if  ((shmflg & SHM_NORESERVE) &&
524 				sysctl_overcommit_memory != OVERCOMMIT_NEVER)
525 			acctflag = VM_NORESERVE;
526 		file = shmem_file_setup(name, size, acctflag);
527 	}
528 	error = PTR_ERR(file);
529 	if (IS_ERR(file))
530 		goto no_file;
531 
532 	shp->shm_cprid = task_tgid_vnr(current);
533 	shp->shm_lprid = 0;
534 	shp->shm_atim = shp->shm_dtim = 0;
535 	shp->shm_ctim = get_seconds();
536 	shp->shm_segsz = size;
537 	shp->shm_nattch = 0;
538 	shp->shm_file = file;
539 	shp->shm_creator = current;
540 
541 	id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
542 	if (id < 0) {
543 		error = id;
544 		goto no_id;
545 	}
546 
547 	/*
548 	 * shmid gets reported as "inode#" in /proc/pid/maps.
549 	 * proc-ps tools use this. Changing this will break them.
550 	 */
551 	file_inode(file)->i_ino = shp->shm_perm.id;
552 
553 	ns->shm_tot += numpages;
554 	error = shp->shm_perm.id;
555 	shm_unlock(shp);
556 	return error;
557 
558 no_id:
559 	if (is_file_hugepages(file) && shp->mlock_user)
560 		user_shm_unlock(size, shp->mlock_user);
561 	fput(file);
562 no_file:
563 	ipc_rcu_putref(shp, shm_rcu_free);
564 	return error;
565 }
566 
567 /*
568  * Called with shm_ids.rw_mutex and ipcp locked.
569  */
shm_security(struct kern_ipc_perm * ipcp,int shmflg)570 static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
571 {
572 	struct shmid_kernel *shp;
573 
574 	shp = container_of(ipcp, struct shmid_kernel, shm_perm);
575 	return security_shm_associate(shp, shmflg);
576 }
577 
578 /*
579  * Called with shm_ids.rw_mutex and ipcp locked.
580  */
shm_more_checks(struct kern_ipc_perm * ipcp,struct ipc_params * params)581 static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
582 				struct ipc_params *params)
583 {
584 	struct shmid_kernel *shp;
585 
586 	shp = container_of(ipcp, struct shmid_kernel, shm_perm);
587 	if (shp->shm_segsz < params->u.size)
588 		return -EINVAL;
589 
590 	return 0;
591 }
592 
SYSCALL_DEFINE3(shmget,key_t,key,size_t,size,int,shmflg)593 SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
594 {
595 	struct ipc_namespace *ns;
596 	struct ipc_ops shm_ops;
597 	struct ipc_params shm_params;
598 
599 	ns = current->nsproxy->ipc_ns;
600 
601 	shm_ops.getnew = newseg;
602 	shm_ops.associate = shm_security;
603 	shm_ops.more_checks = shm_more_checks;
604 
605 	shm_params.key = key;
606 	shm_params.flg = shmflg;
607 	shm_params.u.size = size;
608 
609 	return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
610 }
611 
copy_shmid_to_user(void __user * buf,struct shmid64_ds * in,int version)612 static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
613 {
614 	switch(version) {
615 	case IPC_64:
616 		return copy_to_user(buf, in, sizeof(*in));
617 	case IPC_OLD:
618 	    {
619 		struct shmid_ds out;
620 
621 		memset(&out, 0, sizeof(out));
622 		ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
623 		out.shm_segsz	= in->shm_segsz;
624 		out.shm_atime	= in->shm_atime;
625 		out.shm_dtime	= in->shm_dtime;
626 		out.shm_ctime	= in->shm_ctime;
627 		out.shm_cpid	= in->shm_cpid;
628 		out.shm_lpid	= in->shm_lpid;
629 		out.shm_nattch	= in->shm_nattch;
630 
631 		return copy_to_user(buf, &out, sizeof(out));
632 	    }
633 	default:
634 		return -EINVAL;
635 	}
636 }
637 
638 static inline unsigned long
copy_shmid_from_user(struct shmid64_ds * out,void __user * buf,int version)639 copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
640 {
641 	switch(version) {
642 	case IPC_64:
643 		if (copy_from_user(out, buf, sizeof(*out)))
644 			return -EFAULT;
645 		return 0;
646 	case IPC_OLD:
647 	    {
648 		struct shmid_ds tbuf_old;
649 
650 		if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
651 			return -EFAULT;
652 
653 		out->shm_perm.uid	= tbuf_old.shm_perm.uid;
654 		out->shm_perm.gid	= tbuf_old.shm_perm.gid;
655 		out->shm_perm.mode	= tbuf_old.shm_perm.mode;
656 
657 		return 0;
658 	    }
659 	default:
660 		return -EINVAL;
661 	}
662 }
663 
copy_shminfo_to_user(void __user * buf,struct shminfo64 * in,int version)664 static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
665 {
666 	switch(version) {
667 	case IPC_64:
668 		return copy_to_user(buf, in, sizeof(*in));
669 	case IPC_OLD:
670 	    {
671 		struct shminfo out;
672 
673 		if(in->shmmax > INT_MAX)
674 			out.shmmax = INT_MAX;
675 		else
676 			out.shmmax = (int)in->shmmax;
677 
678 		out.shmmin	= in->shmmin;
679 		out.shmmni	= in->shmmni;
680 		out.shmseg	= in->shmseg;
681 		out.shmall	= in->shmall;
682 
683 		return copy_to_user(buf, &out, sizeof(out));
684 	    }
685 	default:
686 		return -EINVAL;
687 	}
688 }
689 
690 /*
691  * Calculate and add used RSS and swap pages of a shm.
692  * Called with shm_ids.rw_mutex held as a reader
693  */
shm_add_rss_swap(struct shmid_kernel * shp,unsigned long * rss_add,unsigned long * swp_add)694 static void shm_add_rss_swap(struct shmid_kernel *shp,
695 	unsigned long *rss_add, unsigned long *swp_add)
696 {
697 	struct inode *inode;
698 
699 	inode = file_inode(shp->shm_file);
700 
701 	if (is_file_hugepages(shp->shm_file)) {
702 		struct address_space *mapping = inode->i_mapping;
703 		struct hstate *h = hstate_file(shp->shm_file);
704 		*rss_add += pages_per_huge_page(h) * mapping->nrpages;
705 	} else {
706 #ifdef CONFIG_SHMEM
707 		struct shmem_inode_info *info = SHMEM_I(inode);
708 		spin_lock(&info->lock);
709 		*rss_add += inode->i_mapping->nrpages;
710 		*swp_add += info->swapped;
711 		spin_unlock(&info->lock);
712 #else
713 		*rss_add += inode->i_mapping->nrpages;
714 #endif
715 	}
716 }
717 
718 /*
719  * Called with shm_ids.rw_mutex held as a reader
720  */
shm_get_stat(struct ipc_namespace * ns,unsigned long * rss,unsigned long * swp)721 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
722 		unsigned long *swp)
723 {
724 	int next_id;
725 	int total, in_use;
726 
727 	*rss = 0;
728 	*swp = 0;
729 
730 	in_use = shm_ids(ns).in_use;
731 
732 	for (total = 0, next_id = 0; total < in_use; next_id++) {
733 		struct kern_ipc_perm *ipc;
734 		struct shmid_kernel *shp;
735 
736 		ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
737 		if (ipc == NULL)
738 			continue;
739 		shp = container_of(ipc, struct shmid_kernel, shm_perm);
740 
741 		shm_add_rss_swap(shp, rss, swp);
742 
743 		total++;
744 	}
745 }
746 
747 /*
748  * This function handles some shmctl commands which require the rw_mutex
749  * to be held in write mode.
750  * NOTE: no locks must be held, the rw_mutex is taken inside this function.
751  */
shmctl_down(struct ipc_namespace * ns,int shmid,int cmd,struct shmid_ds __user * buf,int version)752 static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
753 		       struct shmid_ds __user *buf, int version)
754 {
755 	struct kern_ipc_perm *ipcp;
756 	struct shmid64_ds shmid64;
757 	struct shmid_kernel *shp;
758 	int err;
759 
760 	if (cmd == IPC_SET) {
761 		if (copy_shmid_from_user(&shmid64, buf, version))
762 			return -EFAULT;
763 	}
764 
765 	ipcp = ipcctl_pre_down(ns, &shm_ids(ns), shmid, cmd,
766 			       &shmid64.shm_perm, 0);
767 	if (IS_ERR(ipcp))
768 		return PTR_ERR(ipcp);
769 
770 	shp = container_of(ipcp, struct shmid_kernel, shm_perm);
771 
772 	err = security_shm_shmctl(shp, cmd);
773 	if (err)
774 		goto out_unlock;
775 	switch (cmd) {
776 	case IPC_RMID:
777 		do_shm_rmid(ns, ipcp);
778 		goto out_up;
779 	case IPC_SET:
780 		err = ipc_update_perm(&shmid64.shm_perm, ipcp);
781 		if (err)
782 			goto out_unlock;
783 		shp->shm_ctim = get_seconds();
784 		break;
785 	default:
786 		err = -EINVAL;
787 	}
788 out_unlock:
789 	shm_unlock(shp);
790 out_up:
791 	up_write(&shm_ids(ns).rw_mutex);
792 	return err;
793 }
794 
SYSCALL_DEFINE3(shmctl,int,shmid,int,cmd,struct shmid_ds __user *,buf)795 SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
796 {
797 	struct shmid_kernel *shp;
798 	int err, version;
799 	struct ipc_namespace *ns;
800 
801 	if (cmd < 0 || shmid < 0) {
802 		err = -EINVAL;
803 		goto out;
804 	}
805 
806 	version = ipc_parse_version(&cmd);
807 	ns = current->nsproxy->ipc_ns;
808 
809 	switch (cmd) { /* replace with proc interface ? */
810 	case IPC_INFO:
811 	{
812 		struct shminfo64 shminfo;
813 
814 		err = security_shm_shmctl(NULL, cmd);
815 		if (err)
816 			return err;
817 
818 		memset(&shminfo, 0, sizeof(shminfo));
819 		shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
820 		shminfo.shmmax = ns->shm_ctlmax;
821 		shminfo.shmall = ns->shm_ctlall;
822 
823 		shminfo.shmmin = SHMMIN;
824 		if(copy_shminfo_to_user (buf, &shminfo, version))
825 			return -EFAULT;
826 
827 		down_read(&shm_ids(ns).rw_mutex);
828 		err = ipc_get_maxid(&shm_ids(ns));
829 		up_read(&shm_ids(ns).rw_mutex);
830 
831 		if(err<0)
832 			err = 0;
833 		goto out;
834 	}
835 	case SHM_INFO:
836 	{
837 		struct shm_info shm_info;
838 
839 		err = security_shm_shmctl(NULL, cmd);
840 		if (err)
841 			return err;
842 
843 		memset(&shm_info, 0, sizeof(shm_info));
844 		down_read(&shm_ids(ns).rw_mutex);
845 		shm_info.used_ids = shm_ids(ns).in_use;
846 		shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
847 		shm_info.shm_tot = ns->shm_tot;
848 		shm_info.swap_attempts = 0;
849 		shm_info.swap_successes = 0;
850 		err = ipc_get_maxid(&shm_ids(ns));
851 		up_read(&shm_ids(ns).rw_mutex);
852 		if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
853 			err = -EFAULT;
854 			goto out;
855 		}
856 
857 		err = err < 0 ? 0 : err;
858 		goto out;
859 	}
860 	case SHM_STAT:
861 	case IPC_STAT:
862 	{
863 		struct shmid64_ds tbuf;
864 		int result;
865 
866 		if (cmd == SHM_STAT) {
867 			shp = shm_lock(ns, shmid);
868 			if (IS_ERR(shp)) {
869 				err = PTR_ERR(shp);
870 				goto out;
871 			}
872 			result = shp->shm_perm.id;
873 		} else {
874 			shp = shm_lock_check(ns, shmid);
875 			if (IS_ERR(shp)) {
876 				err = PTR_ERR(shp);
877 				goto out;
878 			}
879 			result = 0;
880 		}
881 		err = -EACCES;
882 		if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
883 			goto out_unlock;
884 		err = security_shm_shmctl(shp, cmd);
885 		if (err)
886 			goto out_unlock;
887 		memset(&tbuf, 0, sizeof(tbuf));
888 		kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
889 		tbuf.shm_segsz	= shp->shm_segsz;
890 		tbuf.shm_atime	= shp->shm_atim;
891 		tbuf.shm_dtime	= shp->shm_dtim;
892 		tbuf.shm_ctime	= shp->shm_ctim;
893 		tbuf.shm_cpid	= shp->shm_cprid;
894 		tbuf.shm_lpid	= shp->shm_lprid;
895 		tbuf.shm_nattch	= shp->shm_nattch;
896 		shm_unlock(shp);
897 		if(copy_shmid_to_user (buf, &tbuf, version))
898 			err = -EFAULT;
899 		else
900 			err = result;
901 		goto out;
902 	}
903 	case SHM_LOCK:
904 	case SHM_UNLOCK:
905 	{
906 		struct file *shm_file;
907 
908 		shp = shm_lock_check(ns, shmid);
909 		if (IS_ERR(shp)) {
910 			err = PTR_ERR(shp);
911 			goto out;
912 		}
913 
914 		audit_ipc_obj(&(shp->shm_perm));
915 
916 		if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
917 			kuid_t euid = current_euid();
918 			err = -EPERM;
919 			if (!uid_eq(euid, shp->shm_perm.uid) &&
920 			    !uid_eq(euid, shp->shm_perm.cuid))
921 				goto out_unlock;
922 			if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
923 				goto out_unlock;
924 		}
925 
926 		err = security_shm_shmctl(shp, cmd);
927 		if (err)
928 			goto out_unlock;
929 
930 		shm_file = shp->shm_file;
931 		if (is_file_hugepages(shm_file))
932 			goto out_unlock;
933 
934 		if (cmd == SHM_LOCK) {
935 			struct user_struct *user = current_user();
936 			err = shmem_lock(shm_file, 1, user);
937 			if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
938 				shp->shm_perm.mode |= SHM_LOCKED;
939 				shp->mlock_user = user;
940 			}
941 			goto out_unlock;
942 		}
943 
944 		/* SHM_UNLOCK */
945 		if (!(shp->shm_perm.mode & SHM_LOCKED))
946 			goto out_unlock;
947 		shmem_lock(shm_file, 0, shp->mlock_user);
948 		shp->shm_perm.mode &= ~SHM_LOCKED;
949 		shp->mlock_user = NULL;
950 		get_file(shm_file);
951 		shm_unlock(shp);
952 		shmem_unlock_mapping(shm_file->f_mapping);
953 		fput(shm_file);
954 		goto out;
955 	}
956 	case IPC_RMID:
957 	case IPC_SET:
958 		err = shmctl_down(ns, shmid, cmd, buf, version);
959 		return err;
960 	default:
961 		return -EINVAL;
962 	}
963 
964 out_unlock:
965 	shm_unlock(shp);
966 out:
967 	return err;
968 }
969 
970 /*
971  * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
972  *
973  * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
974  * "raddr" thing points to kernel space, and there has to be a wrapper around
975  * this.
976  */
do_shmat(int shmid,char __user * shmaddr,int shmflg,ulong * raddr,unsigned long shmlba)977 long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
978 	      unsigned long shmlba)
979 {
980 	struct shmid_kernel *shp;
981 	unsigned long addr;
982 	unsigned long size;
983 	struct file * file;
984 	int    err;
985 	unsigned long flags;
986 	unsigned long prot;
987 	int acc_mode;
988 	struct ipc_namespace *ns;
989 	struct shm_file_data *sfd;
990 	struct path path;
991 	fmode_t f_mode;
992 	unsigned long populate = 0;
993 
994 	err = -EINVAL;
995 	if (shmid < 0)
996 		goto out;
997 	else if ((addr = (ulong)shmaddr)) {
998 		if (addr & (shmlba - 1)) {
999 			if (shmflg & SHM_RND)
1000 				addr &= ~(shmlba - 1);	   /* round down */
1001 			else
1002 #ifndef __ARCH_FORCE_SHMLBA
1003 				if (addr & ~PAGE_MASK)
1004 #endif
1005 					goto out;
1006 		}
1007 		flags = MAP_SHARED | MAP_FIXED;
1008 	} else {
1009 		if ((shmflg & SHM_REMAP))
1010 			goto out;
1011 
1012 		flags = MAP_SHARED;
1013 	}
1014 
1015 	if (shmflg & SHM_RDONLY) {
1016 		prot = PROT_READ;
1017 		acc_mode = S_IRUGO;
1018 		f_mode = FMODE_READ;
1019 	} else {
1020 		prot = PROT_READ | PROT_WRITE;
1021 		acc_mode = S_IRUGO | S_IWUGO;
1022 		f_mode = FMODE_READ | FMODE_WRITE;
1023 	}
1024 	if (shmflg & SHM_EXEC) {
1025 		prot |= PROT_EXEC;
1026 		acc_mode |= S_IXUGO;
1027 	}
1028 
1029 	/*
1030 	 * We cannot rely on the fs check since SYSV IPC does have an
1031 	 * additional creator id...
1032 	 */
1033 	ns = current->nsproxy->ipc_ns;
1034 	shp = shm_lock_check(ns, shmid);
1035 	if (IS_ERR(shp)) {
1036 		err = PTR_ERR(shp);
1037 		goto out;
1038 	}
1039 
1040 	err = -EACCES;
1041 	if (ipcperms(ns, &shp->shm_perm, acc_mode))
1042 		goto out_unlock;
1043 
1044 	err = security_shm_shmat(shp, shmaddr, shmflg);
1045 	if (err)
1046 		goto out_unlock;
1047 
1048 	path = shp->shm_file->f_path;
1049 	path_get(&path);
1050 	shp->shm_nattch++;
1051 	size = i_size_read(path.dentry->d_inode);
1052 	shm_unlock(shp);
1053 
1054 	err = -ENOMEM;
1055 	sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
1056 	if (!sfd)
1057 		goto out_put_dentry;
1058 
1059 	file = alloc_file(&path, f_mode,
1060 			  is_file_hugepages(shp->shm_file) ?
1061 				&shm_file_operations_huge :
1062 				&shm_file_operations);
1063 	err = PTR_ERR(file);
1064 	if (IS_ERR(file))
1065 		goto out_free;
1066 
1067 	file->private_data = sfd;
1068 	file->f_mapping = shp->shm_file->f_mapping;
1069 	sfd->id = shp->shm_perm.id;
1070 	sfd->ns = get_ipc_ns(ns);
1071 	sfd->file = shp->shm_file;
1072 	sfd->vm_ops = NULL;
1073 
1074 	err = security_mmap_file(file, prot, flags);
1075 	if (err)
1076 		goto out_fput;
1077 
1078 	down_write(&current->mm->mmap_sem);
1079 	if (addr && !(shmflg & SHM_REMAP)) {
1080 		err = -EINVAL;
1081 		if (find_vma_intersection(current->mm, addr, addr + size))
1082 			goto invalid;
1083 		/*
1084 		 * If shm segment goes below stack, make sure there is some
1085 		 * space left for the stack to grow (at least 4 pages).
1086 		 */
1087 		if (addr < current->mm->start_stack &&
1088 		    addr > current->mm->start_stack - size - PAGE_SIZE * 5)
1089 			goto invalid;
1090 	}
1091 
1092 	addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate);
1093 	*raddr = addr;
1094 	err = 0;
1095 	if (IS_ERR_VALUE(addr))
1096 		err = (long)addr;
1097 invalid:
1098 	up_write(&current->mm->mmap_sem);
1099 	if (populate)
1100 		mm_populate(addr, populate);
1101 
1102 out_fput:
1103 	fput(file);
1104 
1105 out_nattch:
1106 	down_write(&shm_ids(ns).rw_mutex);
1107 	shp = shm_lock(ns, shmid);
1108 	BUG_ON(IS_ERR(shp));
1109 	shp->shm_nattch--;
1110 	if (shm_may_destroy(ns, shp))
1111 		shm_destroy(ns, shp);
1112 	else
1113 		shm_unlock(shp);
1114 	up_write(&shm_ids(ns).rw_mutex);
1115 
1116 out:
1117 	return err;
1118 
1119 out_unlock:
1120 	shm_unlock(shp);
1121 	goto out;
1122 
1123 out_free:
1124 	kfree(sfd);
1125 out_put_dentry:
1126 	path_put(&path);
1127 	goto out_nattch;
1128 }
1129 
SYSCALL_DEFINE3(shmat,int,shmid,char __user *,shmaddr,int,shmflg)1130 SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
1131 {
1132 	unsigned long ret;
1133 	long err;
1134 
1135 	err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
1136 	if (err)
1137 		return err;
1138 	force_successful_syscall_return();
1139 	return (long)ret;
1140 }
1141 
1142 /*
1143  * detach and kill segment if marked destroyed.
1144  * The work is done in shm_close.
1145  */
SYSCALL_DEFINE1(shmdt,char __user *,shmaddr)1146 SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
1147 {
1148 	struct mm_struct *mm = current->mm;
1149 	struct vm_area_struct *vma;
1150 	unsigned long addr = (unsigned long)shmaddr;
1151 	int retval = -EINVAL;
1152 #ifdef CONFIG_MMU
1153 	loff_t size = 0;
1154 	struct vm_area_struct *next;
1155 #endif
1156 
1157 	if (addr & ~PAGE_MASK)
1158 		return retval;
1159 
1160 	down_write(&mm->mmap_sem);
1161 
1162 	/*
1163 	 * This function tries to be smart and unmap shm segments that
1164 	 * were modified by partial mlock or munmap calls:
1165 	 * - It first determines the size of the shm segment that should be
1166 	 *   unmapped: It searches for a vma that is backed by shm and that
1167 	 *   started at address shmaddr. It records it's size and then unmaps
1168 	 *   it.
1169 	 * - Then it unmaps all shm vmas that started at shmaddr and that
1170 	 *   are within the initially determined size.
1171 	 * Errors from do_munmap are ignored: the function only fails if
1172 	 * it's called with invalid parameters or if it's called to unmap
1173 	 * a part of a vma. Both calls in this function are for full vmas,
1174 	 * the parameters are directly copied from the vma itself and always
1175 	 * valid - therefore do_munmap cannot fail. (famous last words?)
1176 	 */
1177 	/*
1178 	 * If it had been mremap()'d, the starting address would not
1179 	 * match the usual checks anyway. So assume all vma's are
1180 	 * above the starting address given.
1181 	 */
1182 	vma = find_vma(mm, addr);
1183 
1184 #ifdef CONFIG_MMU
1185 	while (vma) {
1186 		next = vma->vm_next;
1187 
1188 		/*
1189 		 * Check if the starting address would match, i.e. it's
1190 		 * a fragment created by mprotect() and/or munmap(), or it
1191 		 * otherwise it starts at this address with no hassles.
1192 		 */
1193 		if ((vma->vm_ops == &shm_vm_ops) &&
1194 			(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
1195 
1196 
1197 			size = file_inode(vma->vm_file)->i_size;
1198 			do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1199 			/*
1200 			 * We discovered the size of the shm segment, so
1201 			 * break out of here and fall through to the next
1202 			 * loop that uses the size information to stop
1203 			 * searching for matching vma's.
1204 			 */
1205 			retval = 0;
1206 			vma = next;
1207 			break;
1208 		}
1209 		vma = next;
1210 	}
1211 
1212 	/*
1213 	 * We need look no further than the maximum address a fragment
1214 	 * could possibly have landed at. Also cast things to loff_t to
1215 	 * prevent overflows and make comparisons vs. equal-width types.
1216 	 */
1217 	size = PAGE_ALIGN(size);
1218 	while (vma && (loff_t)(vma->vm_end - addr) <= size) {
1219 		next = vma->vm_next;
1220 
1221 		/* finding a matching vma now does not alter retval */
1222 		if ((vma->vm_ops == &shm_vm_ops) &&
1223 			(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff)
1224 
1225 			do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1226 		vma = next;
1227 	}
1228 
1229 #else /* CONFIG_MMU */
1230 	/* under NOMMU conditions, the exact address to be destroyed must be
1231 	 * given */
1232 	retval = -EINVAL;
1233 	if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
1234 		do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1235 		retval = 0;
1236 	}
1237 
1238 #endif
1239 
1240 	up_write(&mm->mmap_sem);
1241 	return retval;
1242 }
1243 
1244 #ifdef CONFIG_PROC_FS
sysvipc_shm_proc_show(struct seq_file * s,void * it)1245 static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
1246 {
1247 	struct user_namespace *user_ns = seq_user_ns(s);
1248 	struct shmid_kernel *shp = it;
1249 	unsigned long rss = 0, swp = 0;
1250 
1251 	shm_add_rss_swap(shp, &rss, &swp);
1252 
1253 #if BITS_PER_LONG <= 32
1254 #define SIZE_SPEC "%10lu"
1255 #else
1256 #define SIZE_SPEC "%21lu"
1257 #endif
1258 
1259 	return seq_printf(s,
1260 			  "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
1261 			  "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
1262 			  SIZE_SPEC " " SIZE_SPEC "\n",
1263 			  shp->shm_perm.key,
1264 			  shp->shm_perm.id,
1265 			  shp->shm_perm.mode,
1266 			  shp->shm_segsz,
1267 			  shp->shm_cprid,
1268 			  shp->shm_lprid,
1269 			  shp->shm_nattch,
1270 			  from_kuid_munged(user_ns, shp->shm_perm.uid),
1271 			  from_kgid_munged(user_ns, shp->shm_perm.gid),
1272 			  from_kuid_munged(user_ns, shp->shm_perm.cuid),
1273 			  from_kgid_munged(user_ns, shp->shm_perm.cgid),
1274 			  shp->shm_atim,
1275 			  shp->shm_dtim,
1276 			  shp->shm_ctim,
1277 			  rss * PAGE_SIZE,
1278 			  swp * PAGE_SIZE);
1279 }
1280 #endif
1281