blob: 5bb617f6306e8df814398505393b15e2b0c3c0ee [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Steve Grubb073115d2006-04-02 17:07:33 -040016 * support for audit of ipc object properties and permission changes
17 * Dustin Kirkland <dustin.kirkland@us.ibm.com>
Kirill Korotaev4e982312006-10-02 02:18:22 -070018 *
19 * namespaces support
20 * OpenVZ, SWsoft Inc.
21 * Pavel Emelianov <xemul@openvz.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 */
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/shmem_fs.h>
32#include <linux/security.h>
33#include <linux/syscalls.h>
34#include <linux/audit.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080035#include <linux/capability.h>
Stephen Rothwell7d87e14c2005-05-01 08:59:12 -070036#include <linux/ptrace.h>
Mike Waychison19b49462005-09-06 15:17:10 -070037#include <linux/seq_file.h>
Ingo Molnar5f921ae2006-03-26 01:37:17 -080038#include <linux/mutex.h>
Kirill Korotaev4e982312006-10-02 02:18:22 -070039#include <linux/nsproxy.h>
Stephen Rothwell7d87e14c2005-05-01 08:59:12 -070040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/uaccess.h>
42
43#include "util.h"
44
Arjan van de Ven9a321442007-02-12 00:55:35 -080045static const struct file_operations shm_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static struct vm_operations_struct shm_vm_ops;
47
Kirill Korotaev4e982312006-10-02 02:18:22 -070048static struct ipc_ids init_shm_ids;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Kirill Korotaev4e982312006-10-02 02:18:22 -070050#define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS]))
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Kirill Korotaev4e982312006-10-02 02:18:22 -070052#define shm_lock(ns, id) \
53 ((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id))
54#define shm_unlock(shp) \
55 ipc_unlock(&(shp)->shm_perm)
56#define shm_get(ns, id) \
57 ((struct shmid_kernel*)ipc_get(&shm_ids(ns),id))
58#define shm_buildid(ns, id, seq) \
59 ipc_buildid(&shm_ids(ns), id, seq)
60
61static int newseg (struct ipc_namespace *ns, key_t key,
62 int shmflg, size_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static void shm_open (struct vm_area_struct *shmd);
64static void shm_close (struct vm_area_struct *shmd);
Kirill Korotaev4e982312006-10-02 02:18:22 -070065static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#ifdef CONFIG_PROC_FS
Mike Waychison19b49462005-09-06 15:17:10 -070067static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#endif
69
Kirill Korotaev4e982312006-10-02 02:18:22 -070070static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids)
71{
72 ns->ids[IPC_SHM_IDS] = ids;
73 ns->shm_ctlmax = SHMMAX;
74 ns->shm_ctlall = SHMALL;
75 ns->shm_ctlmni = SHMMNI;
76 ns->shm_tot = 0;
77 ipc_init_ids(ids, 1);
78}
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Kirill Korotaev4e982312006-10-02 02:18:22 -070080static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
81{
82 if (shp->shm_nattch){
83 shp->shm_perm.mode |= SHM_DEST;
84 /* Do not find it any more */
85 shp->shm_perm.key = IPC_PRIVATE;
86 shm_unlock(shp);
87 } else
88 shm_destroy(ns, shp);
89}
90
91#ifdef CONFIG_IPC_NS
92int shm_init_ns(struct ipc_namespace *ns)
93{
94 struct ipc_ids *ids;
95
96 ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL);
97 if (ids == NULL)
98 return -ENOMEM;
99
100 __shm_init_ns(ns, ids);
101 return 0;
102}
103
104void shm_exit_ns(struct ipc_namespace *ns)
105{
106 int i;
107 struct shmid_kernel *shp;
108
109 mutex_lock(&shm_ids(ns).mutex);
110 for (i = 0; i <= shm_ids(ns).max_id; i++) {
111 shp = shm_lock(ns, i);
112 if (shp == NULL)
113 continue;
114
115 do_shm_rmid(ns, shp);
116 }
117 mutex_unlock(&shm_ids(ns).mutex);
118
Pavel Emelianovc7e12b82006-11-02 22:07:03 -0800119 ipc_fini_ids(ns->ids[IPC_SHM_IDS]);
Kirill Korotaev4e982312006-10-02 02:18:22 -0700120 kfree(ns->ids[IPC_SHM_IDS]);
121 ns->ids[IPC_SHM_IDS] = NULL;
122}
123#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125void __init shm_init (void)
126{
Kirill Korotaev4e982312006-10-02 02:18:22 -0700127 __shm_init_ns(&init_ipc_ns, &init_shm_ids);
Mike Waychison19b49462005-09-06 15:17:10 -0700128 ipc_init_proc_interface("sysvipc/shm",
129 " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n",
Kirill Korotaev4e982312006-10-02 02:18:22 -0700130 IPC_SHM_IDS, sysvipc_shm_proc_show);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
132
Kirill Korotaev4e982312006-10-02 02:18:22 -0700133static inline int shm_checkid(struct ipc_namespace *ns,
134 struct shmid_kernel *s, int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Kirill Korotaev4e982312006-10-02 02:18:22 -0700136 if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return -EIDRM;
138 return 0;
139}
140
Kirill Korotaev4e982312006-10-02 02:18:22 -0700141static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Kirill Korotaev4e982312006-10-02 02:18:22 -0700143 return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
Kirill Korotaev4e982312006-10-02 02:18:22 -0700146static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
Kirill Korotaev4e982312006-10-02 02:18:22 -0700148 return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
150
151
152
Kirill Korotaev4e982312006-10-02 02:18:22 -0700153static inline void shm_inc(struct ipc_namespace *ns, int id)
154{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 struct shmid_kernel *shp;
156
Kirill Korotaev4e982312006-10-02 02:18:22 -0700157 shp = shm_lock(ns, id);
Eric Sesterhenn9ba025f2006-04-02 13:42:42 +0200158 BUG_ON(!shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 shp->shm_atim = get_seconds();
160 shp->shm_lprid = current->tgid;
161 shp->shm_nattch++;
162 shm_unlock(shp);
163}
164
Kirill Korotaev4e982312006-10-02 02:18:22 -0700165#define shm_file_ns(file) (*((struct ipc_namespace **)&(file)->private_data))
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167/* This is called by fork, once for every shm attach. */
Kirill Korotaev4e982312006-10-02 02:18:22 -0700168static void shm_open(struct vm_area_struct *shmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
Kirill Korotaev4e982312006-10-02 02:18:22 -0700170 shm_inc(shm_file_ns(shmd->vm_file),
Josef Sipek6d630792006-12-08 02:37:11 -0800171 shmd->vm_file->f_path.dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
174/*
175 * shm_destroy - free the struct shmid_kernel
176 *
177 * @shp: struct to free
178 *
Ingo Molnar5f921ae2006-03-26 01:37:17 -0800179 * It has to be called with shp and shm_ids.mutex locked,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 * but returns with shp unlocked and freed.
181 */
Kirill Korotaev4e982312006-10-02 02:18:22 -0700182static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Kirill Korotaev4e982312006-10-02 02:18:22 -0700184 ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
185 shm_rmid(ns, shp->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 shm_unlock(shp);
187 if (!is_file_hugepages(shp->shm_file))
188 shmem_lock(shp->shm_file, 0, shp->mlock_user);
189 else
Josef Sipek6d630792006-12-08 02:37:11 -0800190 user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 shp->mlock_user);
192 fput (shp->shm_file);
193 security_shm_free(shp);
194 ipc_rcu_putref(shp);
195}
196
197/*
198 * remove the attach descriptor shmd.
199 * free memory for segment if it is marked destroyed.
200 * The descriptor has already been removed from the current->mm->mmap list
201 * and will later be kfree()d.
202 */
203static void shm_close (struct vm_area_struct *shmd)
204{
205 struct file * file = shmd->vm_file;
Josef Sipek6d630792006-12-08 02:37:11 -0800206 int id = file->f_path.dentry->d_inode->i_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 struct shmid_kernel *shp;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700208 struct ipc_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Kirill Korotaev4e982312006-10-02 02:18:22 -0700210 ns = shm_file_ns(file);
211
212 mutex_lock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 /* remove from the list of attaches of the shm segment */
Kirill Korotaev4e982312006-10-02 02:18:22 -0700214 shp = shm_lock(ns, id);
Eric Sesterhenn9ba025f2006-04-02 13:42:42 +0200215 BUG_ON(!shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 shp->shm_lprid = current->tgid;
217 shp->shm_dtim = get_seconds();
218 shp->shm_nattch--;
219 if(shp->shm_nattch == 0 &&
Andrew Mortonb33291c2006-01-08 01:02:21 -0800220 shp->shm_perm.mode & SHM_DEST)
Kirill Korotaev4e982312006-10-02 02:18:22 -0700221 shm_destroy(ns, shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 else
223 shm_unlock(shp);
Kirill Korotaev4e982312006-10-02 02:18:22 -0700224 mutex_unlock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225}
226
227static int shm_mmap(struct file * file, struct vm_area_struct * vma)
228{
David Howellsb0e15192006-01-06 00:11:42 -0800229 int ret;
230
231 ret = shmem_mmap(file, vma);
232 if (ret == 0) {
233 vma->vm_ops = &shm_vm_ops;
Hugh Dickinsb78b6af2006-04-12 14:34:27 -0700234 if (!(vma->vm_flags & VM_WRITE))
235 vma->vm_flags &= ~VM_MAYWRITE;
Josef Sipek6d630792006-12-08 02:37:11 -0800236 shm_inc(shm_file_ns(file), file->f_path.dentry->d_inode->i_ino);
David Howellsb0e15192006-01-06 00:11:42 -0800237 }
238
239 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
Kirill Korotaev4e982312006-10-02 02:18:22 -0700242static int shm_release(struct inode *ino, struct file *file)
243{
244 struct ipc_namespace *ns;
245
246 ns = shm_file_ns(file);
247 put_ipc_ns(ns);
248 shm_file_ns(file) = NULL;
249 return 0;
250}
251
Arjan van de Ven9a321442007-02-12 00:55:35 -0800252static const struct file_operations shm_file_operations = {
Kirill Korotaev4e982312006-10-02 02:18:22 -0700253 .mmap = shm_mmap,
254 .release = shm_release,
David Howellsb0e15192006-01-06 00:11:42 -0800255#ifndef CONFIG_MMU
256 .get_unmapped_area = shmem_get_unmapped_area,
257#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258};
259
260static struct vm_operations_struct shm_vm_ops = {
261 .open = shm_open, /* callback for a new vm-area open */
262 .close = shm_close, /* callback for when the vm-area is released */
263 .nopage = shmem_nopage,
Andrew Morton6ade43f2005-08-01 21:11:45 -0700264#if defined(CONFIG_NUMA) && defined(CONFIG_SHMEM)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 .set_policy = shmem_set_policy,
266 .get_policy = shmem_get_policy,
267#endif
268};
269
Kirill Korotaev4e982312006-10-02 02:18:22 -0700270static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
272 int error;
273 struct shmid_kernel *shp;
274 int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT;
275 struct file * file;
276 char name[13];
277 int id;
278
Kirill Korotaev4e982312006-10-02 02:18:22 -0700279 if (size < SHMMIN || size > ns->shm_ctlmax)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 return -EINVAL;
281
Guy Streeterf66d45e2007-01-23 12:20:04 -0600282 if (ns->shm_tot + numpages > ns->shm_ctlall)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return -ENOSPC;
284
285 shp = ipc_rcu_alloc(sizeof(*shp));
286 if (!shp)
287 return -ENOMEM;
288
289 shp->shm_perm.key = key;
Andrew Mortonb33291c2006-01-08 01:02:21 -0800290 shp->shm_perm.mode = (shmflg & S_IRWXUGO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 shp->mlock_user = NULL;
292
293 shp->shm_perm.security = NULL;
294 error = security_shm_alloc(shp);
295 if (error) {
296 ipc_rcu_putref(shp);
297 return error;
298 }
299
300 if (shmflg & SHM_HUGETLB) {
301 /* hugetlb_zero_setup takes care of mlock user accounting */
302 file = hugetlb_zero_setup(size);
303 shp->mlock_user = current->user;
304 } else {
Badari Pulavartybf8f9722005-11-07 00:59:27 -0800305 int acctflag = VM_ACCOUNT;
306 /*
307 * Do not allow no accounting for OVERCOMMIT_NEVER, even
308 * if it's asked for.
309 */
310 if ((shmflg & SHM_NORESERVE) &&
311 sysctl_overcommit_memory != OVERCOMMIT_NEVER)
312 acctflag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 sprintf (name, "SYSV%08x", key);
Badari Pulavartybf8f9722005-11-07 00:59:27 -0800314 file = shmem_file_setup(name, size, acctflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 }
316 error = PTR_ERR(file);
317 if (IS_ERR(file))
318 goto no_file;
319
320 error = -ENOSPC;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700321 id = shm_addid(ns, shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 if(id == -1)
323 goto no_id;
324
325 shp->shm_cprid = current->tgid;
326 shp->shm_lprid = 0;
327 shp->shm_atim = shp->shm_dtim = 0;
328 shp->shm_ctim = get_seconds();
329 shp->shm_segsz = size;
330 shp->shm_nattch = 0;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700331 shp->id = shm_buildid(ns, id, shp->shm_perm.seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 shp->shm_file = file;
Josef Sipek6d630792006-12-08 02:37:11 -0800333 file->f_path.dentry->d_inode->i_ino = shp->id;
Krishnakumar R551110a2005-10-29 18:16:45 -0700334
Kirill Korotaev4e982312006-10-02 02:18:22 -0700335 shm_file_ns(file) = get_ipc_ns(ns);
336
Krishnakumar R551110a2005-10-29 18:16:45 -0700337 /* Hugetlb ops would have already been assigned. */
338 if (!(shmflg & SHM_HUGETLB))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 file->f_op = &shm_file_operations;
Krishnakumar R551110a2005-10-29 18:16:45 -0700340
Kirill Korotaev4e982312006-10-02 02:18:22 -0700341 ns->shm_tot += numpages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 shm_unlock(shp);
343 return shp->id;
344
345no_id:
346 fput(file);
347no_file:
348 security_shm_free(shp);
349 ipc_rcu_putref(shp);
350 return error;
351}
352
353asmlinkage long sys_shmget (key_t key, size_t size, int shmflg)
354{
355 struct shmid_kernel *shp;
356 int err, id = 0;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700357 struct ipc_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Kirill Korotaev4e982312006-10-02 02:18:22 -0700359 ns = current->nsproxy->ipc_ns;
360
361 mutex_lock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (key == IPC_PRIVATE) {
Kirill Korotaev4e982312006-10-02 02:18:22 -0700363 err = newseg(ns, key, shmflg, size);
364 } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (!(shmflg & IPC_CREAT))
366 err = -ENOENT;
367 else
Kirill Korotaev4e982312006-10-02 02:18:22 -0700368 err = newseg(ns, key, shmflg, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 } else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) {
370 err = -EEXIST;
371 } else {
Kirill Korotaev4e982312006-10-02 02:18:22 -0700372 shp = shm_lock(ns, id);
Eric Sesterhenn9ba025f2006-04-02 13:42:42 +0200373 BUG_ON(shp==NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 if (shp->shm_segsz < size)
375 err = -EINVAL;
376 else if (ipcperms(&shp->shm_perm, shmflg))
377 err = -EACCES;
378 else {
Kirill Korotaev4e982312006-10-02 02:18:22 -0700379 int shmid = shm_buildid(ns, id, shp->shm_perm.seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 err = security_shm_associate(shp, shmflg);
381 if (!err)
382 err = shmid;
383 }
384 shm_unlock(shp);
385 }
Kirill Korotaev4e982312006-10-02 02:18:22 -0700386 mutex_unlock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388 return err;
389}
390
391static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
392{
393 switch(version) {
394 case IPC_64:
395 return copy_to_user(buf, in, sizeof(*in));
396 case IPC_OLD:
397 {
398 struct shmid_ds out;
399
400 ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
401 out.shm_segsz = in->shm_segsz;
402 out.shm_atime = in->shm_atime;
403 out.shm_dtime = in->shm_dtime;
404 out.shm_ctime = in->shm_ctime;
405 out.shm_cpid = in->shm_cpid;
406 out.shm_lpid = in->shm_lpid;
407 out.shm_nattch = in->shm_nattch;
408
409 return copy_to_user(buf, &out, sizeof(out));
410 }
411 default:
412 return -EINVAL;
413 }
414}
415
416struct shm_setbuf {
417 uid_t uid;
418 gid_t gid;
419 mode_t mode;
420};
421
422static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version)
423{
424 switch(version) {
425 case IPC_64:
426 {
427 struct shmid64_ds tbuf;
428
429 if (copy_from_user(&tbuf, buf, sizeof(tbuf)))
430 return -EFAULT;
431
432 out->uid = tbuf.shm_perm.uid;
433 out->gid = tbuf.shm_perm.gid;
Andrew Mortonb33291c2006-01-08 01:02:21 -0800434 out->mode = tbuf.shm_perm.mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 return 0;
437 }
438 case IPC_OLD:
439 {
440 struct shmid_ds tbuf_old;
441
442 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
443 return -EFAULT;
444
445 out->uid = tbuf_old.shm_perm.uid;
446 out->gid = tbuf_old.shm_perm.gid;
Andrew Mortonb33291c2006-01-08 01:02:21 -0800447 out->mode = tbuf_old.shm_perm.mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
449 return 0;
450 }
451 default:
452 return -EINVAL;
453 }
454}
455
456static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
457{
458 switch(version) {
459 case IPC_64:
460 return copy_to_user(buf, in, sizeof(*in));
461 case IPC_OLD:
462 {
463 struct shminfo out;
464
465 if(in->shmmax > INT_MAX)
466 out.shmmax = INT_MAX;
467 else
468 out.shmmax = (int)in->shmmax;
469
470 out.shmmin = in->shmmin;
471 out.shmmni = in->shmmni;
472 out.shmseg = in->shmseg;
473 out.shmall = in->shmall;
474
475 return copy_to_user(buf, &out, sizeof(out));
476 }
477 default:
478 return -EINVAL;
479 }
480}
481
Kirill Korotaev4e982312006-10-02 02:18:22 -0700482static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
483 unsigned long *swp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
485 int i;
486
487 *rss = 0;
488 *swp = 0;
489
Kirill Korotaev4e982312006-10-02 02:18:22 -0700490 for (i = 0; i <= shm_ids(ns).max_id; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 struct shmid_kernel *shp;
492 struct inode *inode;
493
Kirill Korotaev4e982312006-10-02 02:18:22 -0700494 shp = shm_get(ns, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 if(!shp)
496 continue;
497
Josef Sipek6d630792006-12-08 02:37:11 -0800498 inode = shp->shm_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 if (is_file_hugepages(shp->shm_file)) {
501 struct address_space *mapping = inode->i_mapping;
502 *rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages;
503 } else {
504 struct shmem_inode_info *info = SHMEM_I(inode);
505 spin_lock(&info->lock);
506 *rss += inode->i_mapping->nrpages;
507 *swp += info->swapped;
508 spin_unlock(&info->lock);
509 }
510 }
511}
512
513asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
514{
515 struct shm_setbuf setbuf;
516 struct shmid_kernel *shp;
517 int err, version;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700518 struct ipc_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 if (cmd < 0 || shmid < 0) {
521 err = -EINVAL;
522 goto out;
523 }
524
525 version = ipc_parse_version(&cmd);
Kirill Korotaev4e982312006-10-02 02:18:22 -0700526 ns = current->nsproxy->ipc_ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 switch (cmd) { /* replace with proc interface ? */
529 case IPC_INFO:
530 {
531 struct shminfo64 shminfo;
532
533 err = security_shm_shmctl(NULL, cmd);
534 if (err)
535 return err;
536
537 memset(&shminfo,0,sizeof(shminfo));
Kirill Korotaev4e982312006-10-02 02:18:22 -0700538 shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
539 shminfo.shmmax = ns->shm_ctlmax;
540 shminfo.shmall = ns->shm_ctlall;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 shminfo.shmmin = SHMMIN;
543 if(copy_shminfo_to_user (buf, &shminfo, version))
544 return -EFAULT;
545 /* reading a integer is always atomic */
Kirill Korotaev4e982312006-10-02 02:18:22 -0700546 err= shm_ids(ns).max_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if(err<0)
548 err = 0;
549 goto out;
550 }
551 case SHM_INFO:
552 {
553 struct shm_info shm_info;
554
555 err = security_shm_shmctl(NULL, cmd);
556 if (err)
557 return err;
558
559 memset(&shm_info,0,sizeof(shm_info));
Kirill Korotaev4e982312006-10-02 02:18:22 -0700560 mutex_lock(&shm_ids(ns).mutex);
561 shm_info.used_ids = shm_ids(ns).in_use;
562 shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
563 shm_info.shm_tot = ns->shm_tot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 shm_info.swap_attempts = 0;
565 shm_info.swap_successes = 0;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700566 err = shm_ids(ns).max_id;
567 mutex_unlock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 if(copy_to_user (buf, &shm_info, sizeof(shm_info))) {
569 err = -EFAULT;
570 goto out;
571 }
572
573 err = err < 0 ? 0 : err;
574 goto out;
575 }
576 case SHM_STAT:
577 case IPC_STAT:
578 {
579 struct shmid64_ds tbuf;
580 int result;
581 memset(&tbuf, 0, sizeof(tbuf));
Kirill Korotaev4e982312006-10-02 02:18:22 -0700582 shp = shm_lock(ns, shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 if(shp==NULL) {
584 err = -EINVAL;
585 goto out;
586 } else if(cmd==SHM_STAT) {
587 err = -EINVAL;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700588 if (shmid > shm_ids(ns).max_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 goto out_unlock;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700590 result = shm_buildid(ns, shmid, shp->shm_perm.seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 } else {
Kirill Korotaev4e982312006-10-02 02:18:22 -0700592 err = shm_checkid(ns, shp,shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 if(err)
594 goto out_unlock;
595 result = 0;
596 }
597 err=-EACCES;
598 if (ipcperms (&shp->shm_perm, S_IRUGO))
599 goto out_unlock;
600 err = security_shm_shmctl(shp, cmd);
601 if (err)
602 goto out_unlock;
603 kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
604 tbuf.shm_segsz = shp->shm_segsz;
605 tbuf.shm_atime = shp->shm_atim;
606 tbuf.shm_dtime = shp->shm_dtim;
607 tbuf.shm_ctime = shp->shm_ctim;
608 tbuf.shm_cpid = shp->shm_cprid;
609 tbuf.shm_lpid = shp->shm_lprid;
610 if (!is_file_hugepages(shp->shm_file))
611 tbuf.shm_nattch = shp->shm_nattch;
612 else
613 tbuf.shm_nattch = file_count(shp->shm_file) - 1;
614 shm_unlock(shp);
615 if(copy_shmid_to_user (buf, &tbuf, version))
616 err = -EFAULT;
617 else
618 err = result;
619 goto out;
620 }
621 case SHM_LOCK:
622 case SHM_UNLOCK:
623 {
Kirill Korotaev4e982312006-10-02 02:18:22 -0700624 shp = shm_lock(ns, shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 if(shp==NULL) {
626 err = -EINVAL;
627 goto out;
628 }
Kirill Korotaev4e982312006-10-02 02:18:22 -0700629 err = shm_checkid(ns, shp,shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if(err)
631 goto out_unlock;
632
Steve Grubb073115d2006-04-02 17:07:33 -0400633 err = audit_ipc_obj(&(shp->shm_perm));
634 if (err)
635 goto out_unlock;
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (!capable(CAP_IPC_LOCK)) {
638 err = -EPERM;
639 if (current->euid != shp->shm_perm.uid &&
640 current->euid != shp->shm_perm.cuid)
641 goto out_unlock;
642 if (cmd == SHM_LOCK &&
643 !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)
644 goto out_unlock;
645 }
646
647 err = security_shm_shmctl(shp, cmd);
648 if (err)
649 goto out_unlock;
650
651 if(cmd==SHM_LOCK) {
652 struct user_struct * user = current->user;
653 if (!is_file_hugepages(shp->shm_file)) {
654 err = shmem_lock(shp->shm_file, 1, user);
655 if (!err) {
Andrew Mortonb33291c2006-01-08 01:02:21 -0800656 shp->shm_perm.mode |= SHM_LOCKED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 shp->mlock_user = user;
658 }
659 }
660 } else if (!is_file_hugepages(shp->shm_file)) {
661 shmem_lock(shp->shm_file, 0, shp->mlock_user);
Andrew Mortonb33291c2006-01-08 01:02:21 -0800662 shp->shm_perm.mode &= ~SHM_LOCKED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 shp->mlock_user = NULL;
664 }
665 shm_unlock(shp);
666 goto out;
667 }
668 case IPC_RMID:
669 {
670 /*
671 * We cannot simply remove the file. The SVID states
672 * that the block remains until the last person
673 * detaches from it, then is deleted. A shmat() on
674 * an RMID segment is legal in older Linux and if
675 * we change it apps break...
676 *
677 * Instead we set a destroyed flag, and then blow
678 * the name away when the usage hits zero.
679 */
Kirill Korotaev4e982312006-10-02 02:18:22 -0700680 mutex_lock(&shm_ids(ns).mutex);
681 shp = shm_lock(ns, shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 err = -EINVAL;
683 if (shp == NULL)
684 goto out_up;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700685 err = shm_checkid(ns, shp, shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if(err)
687 goto out_unlock_up;
688
Steve Grubb073115d2006-04-02 17:07:33 -0400689 err = audit_ipc_obj(&(shp->shm_perm));
690 if (err)
691 goto out_unlock_up;
692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 if (current->euid != shp->shm_perm.uid &&
694 current->euid != shp->shm_perm.cuid &&
695 !capable(CAP_SYS_ADMIN)) {
696 err=-EPERM;
697 goto out_unlock_up;
698 }
699
700 err = security_shm_shmctl(shp, cmd);
701 if (err)
702 goto out_unlock_up;
703
Kirill Korotaev4e982312006-10-02 02:18:22 -0700704 do_shm_rmid(ns, shp);
705 mutex_unlock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 goto out;
707 }
708
709 case IPC_SET:
710 {
711 if (copy_shmid_from_user (&setbuf, buf, version)) {
712 err = -EFAULT;
713 goto out;
714 }
Kirill Korotaev4e982312006-10-02 02:18:22 -0700715 mutex_lock(&shm_ids(ns).mutex);
716 shp = shm_lock(ns, shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 err=-EINVAL;
718 if(shp==NULL)
719 goto out_up;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700720 err = shm_checkid(ns, shp,shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 if(err)
722 goto out_unlock_up;
Steve Grubb073115d2006-04-02 17:07:33 -0400723 err = audit_ipc_obj(&(shp->shm_perm));
724 if (err)
725 goto out_unlock_up;
Linda Knippersac032212006-05-16 22:03:48 -0400726 err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode);
Steve Grubb073115d2006-04-02 17:07:33 -0400727 if (err)
728 goto out_unlock_up;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 err=-EPERM;
730 if (current->euid != shp->shm_perm.uid &&
731 current->euid != shp->shm_perm.cuid &&
732 !capable(CAP_SYS_ADMIN)) {
733 goto out_unlock_up;
734 }
735
736 err = security_shm_shmctl(shp, cmd);
737 if (err)
738 goto out_unlock_up;
739
740 shp->shm_perm.uid = setbuf.uid;
741 shp->shm_perm.gid = setbuf.gid;
Andrew Mortonb33291c2006-01-08 01:02:21 -0800742 shp->shm_perm.mode = (shp->shm_perm.mode & ~S_IRWXUGO)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 | (setbuf.mode & S_IRWXUGO);
744 shp->shm_ctim = get_seconds();
745 break;
746 }
747
748 default:
749 err = -EINVAL;
750 goto out;
751 }
752
753 err = 0;
754out_unlock_up:
755 shm_unlock(shp);
756out_up:
Kirill Korotaev4e982312006-10-02 02:18:22 -0700757 mutex_unlock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 goto out;
759out_unlock:
760 shm_unlock(shp);
761out:
762 return err;
763}
764
765/*
766 * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
767 *
768 * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
769 * "raddr" thing points to kernel space, and there has to be a wrapper around
770 * this.
771 */
772long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
773{
774 struct shmid_kernel *shp;
775 unsigned long addr;
776 unsigned long size;
777 struct file * file;
778 int err;
779 unsigned long flags;
780 unsigned long prot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 int acc_mode;
782 void *user_addr;
Kirill Korotaev4e982312006-10-02 02:18:22 -0700783 struct ipc_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 if (shmid < 0) {
786 err = -EINVAL;
787 goto out;
788 } else if ((addr = (ulong)shmaddr)) {
789 if (addr & (SHMLBA-1)) {
790 if (shmflg & SHM_RND)
791 addr &= ~(SHMLBA-1); /* round down */
792 else
793#ifndef __ARCH_FORCE_SHMLBA
794 if (addr & ~PAGE_MASK)
795#endif
796 return -EINVAL;
797 }
798 flags = MAP_SHARED | MAP_FIXED;
799 } else {
800 if ((shmflg & SHM_REMAP))
801 return -EINVAL;
802
803 flags = MAP_SHARED;
804 }
805
806 if (shmflg & SHM_RDONLY) {
807 prot = PROT_READ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 acc_mode = S_IRUGO;
809 } else {
810 prot = PROT_READ | PROT_WRITE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 acc_mode = S_IRUGO | S_IWUGO;
812 }
813 if (shmflg & SHM_EXEC) {
814 prot |= PROT_EXEC;
815 acc_mode |= S_IXUGO;
816 }
817
818 /*
819 * We cannot rely on the fs check since SYSV IPC does have an
820 * additional creator id...
821 */
Kirill Korotaev4e982312006-10-02 02:18:22 -0700822 ns = current->nsproxy->ipc_ns;
823 shp = shm_lock(ns, shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 if(shp == NULL) {
825 err = -EINVAL;
826 goto out;
827 }
Kirill Korotaev4e982312006-10-02 02:18:22 -0700828 err = shm_checkid(ns, shp,shmid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 if (err) {
830 shm_unlock(shp);
831 goto out;
832 }
833 if (ipcperms(&shp->shm_perm, acc_mode)) {
834 shm_unlock(shp);
835 err = -EACCES;
836 goto out;
837 }
838
839 err = security_shm_shmat(shp, shmaddr, shmflg);
840 if (err) {
841 shm_unlock(shp);
842 return err;
843 }
844
845 file = shp->shm_file;
Josef Sipek6d630792006-12-08 02:37:11 -0800846 size = i_size_read(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 shp->shm_nattch++;
848 shm_unlock(shp);
849
850 down_write(&current->mm->mmap_sem);
851 if (addr && !(shmflg & SHM_REMAP)) {
852 user_addr = ERR_PTR(-EINVAL);
853 if (find_vma_intersection(current->mm, addr, addr + size))
854 goto invalid;
855 /*
856 * If shm segment goes below stack, make sure there is some
857 * space left for the stack to grow (at least 4 pages).
858 */
859 if (addr < current->mm->start_stack &&
860 addr > current->mm->start_stack - size - PAGE_SIZE * 5)
861 goto invalid;
862 }
863
864 user_addr = (void*) do_mmap (file, addr, size, prot, flags, 0);
865
866invalid:
867 up_write(&current->mm->mmap_sem);
868
Kirill Korotaev4e982312006-10-02 02:18:22 -0700869 mutex_lock(&shm_ids(ns).mutex);
870 shp = shm_lock(ns, shmid);
Eric Sesterhenn9ba025f2006-04-02 13:42:42 +0200871 BUG_ON(!shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 shp->shm_nattch--;
873 if(shp->shm_nattch == 0 &&
Andrew Mortonb33291c2006-01-08 01:02:21 -0800874 shp->shm_perm.mode & SHM_DEST)
Kirill Korotaev4e982312006-10-02 02:18:22 -0700875 shm_destroy(ns, shp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 else
877 shm_unlock(shp);
Kirill Korotaev4e982312006-10-02 02:18:22 -0700878 mutex_unlock(&shm_ids(ns).mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880 *raddr = (unsigned long) user_addr;
881 err = 0;
882 if (IS_ERR(user_addr))
883 err = PTR_ERR(user_addr);
884out:
885 return err;
886}
887
Stephen Rothwell7d87e14c2005-05-01 08:59:12 -0700888asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg)
889{
890 unsigned long ret;
891 long err;
892
893 err = do_shmat(shmid, shmaddr, shmflg, &ret);
894 if (err)
895 return err;
896 force_successful_syscall_return();
897 return (long)ret;
898}
899
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900/*
901 * detach and kill segment if marked destroyed.
902 * The work is done in shm_close.
903 */
904asmlinkage long sys_shmdt(char __user *shmaddr)
905{
906 struct mm_struct *mm = current->mm;
907 struct vm_area_struct *vma, *next;
908 unsigned long addr = (unsigned long)shmaddr;
909 loff_t size = 0;
910 int retval = -EINVAL;
911
Hugh Dickinsdf1e2fb2006-03-24 03:18:06 -0800912 if (addr & ~PAGE_MASK)
913 return retval;
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 down_write(&mm->mmap_sem);
916
917 /*
918 * This function tries to be smart and unmap shm segments that
919 * were modified by partial mlock or munmap calls:
920 * - It first determines the size of the shm segment that should be
921 * unmapped: It searches for a vma that is backed by shm and that
922 * started at address shmaddr. It records it's size and then unmaps
923 * it.
924 * - Then it unmaps all shm vmas that started at shmaddr and that
925 * are within the initially determined size.
926 * Errors from do_munmap are ignored: the function only fails if
927 * it's called with invalid parameters or if it's called to unmap
928 * a part of a vma. Both calls in this function are for full vmas,
929 * the parameters are directly copied from the vma itself and always
930 * valid - therefore do_munmap cannot fail. (famous last words?)
931 */
932 /*
933 * If it had been mremap()'d, the starting address would not
934 * match the usual checks anyway. So assume all vma's are
935 * above the starting address given.
936 */
937 vma = find_vma(mm, addr);
938
939 while (vma) {
940 next = vma->vm_next;
941
942 /*
943 * Check if the starting address would match, i.e. it's
944 * a fragment created by mprotect() and/or munmap(), or it
945 * otherwise it starts at this address with no hassles.
946 */
947 if ((vma->vm_ops == &shm_vm_ops || is_vm_hugetlb_page(vma)) &&
948 (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
949
950
Josef Sipek6d630792006-12-08 02:37:11 -0800951 size = vma->vm_file->f_path.dentry->d_inode->i_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
953 /*
954 * We discovered the size of the shm segment, so
955 * break out of here and fall through to the next
956 * loop that uses the size information to stop
957 * searching for matching vma's.
958 */
959 retval = 0;
960 vma = next;
961 break;
962 }
963 vma = next;
964 }
965
966 /*
967 * We need look no further than the maximum address a fragment
968 * could possibly have landed at. Also cast things to loff_t to
969 * prevent overflows and make comparisions vs. equal-width types.
970 */
KAMEZAWA Hiroyuki8e367092006-02-10 01:51:12 -0800971 size = PAGE_ALIGN(size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 while (vma && (loff_t)(vma->vm_end - addr) <= size) {
973 next = vma->vm_next;
974
975 /* finding a matching vma now does not alter retval */
976 if ((vma->vm_ops == &shm_vm_ops || is_vm_hugetlb_page(vma)) &&
977 (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff)
978
979 do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
980 vma = next;
981 }
982
983 up_write(&mm->mmap_sem);
984 return retval;
985}
986
987#ifdef CONFIG_PROC_FS
Mike Waychison19b49462005-09-06 15:17:10 -0700988static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989{
Mike Waychison19b49462005-09-06 15:17:10 -0700990 struct shmid_kernel *shp = it;
991 char *format;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993#define SMALL_STRING "%10d %10d %4o %10u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n"
994#define BIG_STRING "%10d %10d %4o %21u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
Mike Waychison19b49462005-09-06 15:17:10 -0700996 if (sizeof(size_t) <= sizeof(int))
997 format = SMALL_STRING;
998 else
999 format = BIG_STRING;
1000 return seq_printf(s, format,
1001 shp->shm_perm.key,
1002 shp->id,
Andrew Mortonb33291c2006-01-08 01:02:21 -08001003 shp->shm_perm.mode,
Mike Waychison19b49462005-09-06 15:17:10 -07001004 shp->shm_segsz,
1005 shp->shm_cprid,
1006 shp->shm_lprid,
1007 is_file_hugepages(shp->shm_file) ? (file_count(shp->shm_file) - 1) : shp->shm_nattch,
1008 shp->shm_perm.uid,
1009 shp->shm_perm.gid,
1010 shp->shm_perm.cuid,
1011 shp->shm_perm.cgid,
1012 shp->shm_atim,
1013 shp->shm_dtim,
1014 shp->shm_ctim);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015}
1016#endif