Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | * | |
073115d6 SG |
16 | * support for audit of ipc object properties and permission changes |
17 | * Dustin Kirkland <dustin.kirkland@us.ibm.com> | |
4e982311 KK |
18 | * |
19 | * namespaces support | |
20 | * OpenVZ, SWsoft Inc. | |
21 | * Pavel Emelianov <xemul@openvz.org> | |
1da177e4 LT |
22 | */ |
23 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
31 | #include <linux/shmem_fs.h> |
32 | #include <linux/security.h> | |
33 | #include <linux/syscalls.h> | |
34 | #include <linux/audit.h> | |
c59ede7b | 35 | #include <linux/capability.h> |
7d87e14c | 36 | #include <linux/ptrace.h> |
19b4946c | 37 | #include <linux/seq_file.h> |
5f921ae9 | 38 | #include <linux/mutex.h> |
4e982311 | 39 | #include <linux/nsproxy.h> |
bc56bba8 | 40 | #include <linux/mount.h> |
7d87e14c | 41 | |
1da177e4 LT |
42 | #include <asm/uaccess.h> |
43 | ||
44 | #include "util.h" | |
45 | ||
bc56bba8 EB |
46 | struct shm_file_data { |
47 | int id; | |
48 | struct ipc_namespace *ns; | |
49 | struct file *file; | |
50 | const struct vm_operations_struct *vm_ops; | |
51 | }; | |
52 | ||
53 | #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data)) | |
54 | ||
9a32144e | 55 | static const struct file_operations shm_file_operations; |
1da177e4 LT |
56 | static struct vm_operations_struct shm_vm_ops; |
57 | ||
4e982311 KK |
58 | static struct ipc_ids init_shm_ids; |
59 | ||
60 | #define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS])) | |
1da177e4 | 61 | |
4e982311 KK |
62 | #define shm_lock(ns, id) \ |
63 | ((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id)) | |
64 | #define shm_unlock(shp) \ | |
65 | ipc_unlock(&(shp)->shm_perm) | |
66 | #define shm_get(ns, id) \ | |
67 | ((struct shmid_kernel*)ipc_get(&shm_ids(ns),id)) | |
68 | #define shm_buildid(ns, id, seq) \ | |
69 | ipc_buildid(&shm_ids(ns), id, seq) | |
1da177e4 | 70 | |
4e982311 KK |
71 | static int newseg (struct ipc_namespace *ns, key_t key, |
72 | int shmflg, size_t size); | |
bc56bba8 EB |
73 | static void shm_open(struct vm_area_struct *vma); |
74 | static void shm_close(struct vm_area_struct *vma); | |
4e982311 | 75 | static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp); |
1da177e4 | 76 | #ifdef CONFIG_PROC_FS |
19b4946c | 77 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it); |
1da177e4 LT |
78 | #endif |
79 | ||
7d69a1f4 | 80 | static void __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids) |
4e982311 KK |
81 | { |
82 | ns->ids[IPC_SHM_IDS] = ids; | |
83 | ns->shm_ctlmax = SHMMAX; | |
84 | ns->shm_ctlall = SHMALL; | |
85 | ns->shm_ctlmni = SHMMNI; | |
86 | ns->shm_tot = 0; | |
87 | ipc_init_ids(ids, 1); | |
88 | } | |
89 | ||
90 | static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp) | |
91 | { | |
92 | if (shp->shm_nattch){ | |
93 | shp->shm_perm.mode |= SHM_DEST; | |
94 | /* Do not find it any more */ | |
95 | shp->shm_perm.key = IPC_PRIVATE; | |
96 | shm_unlock(shp); | |
97 | } else | |
98 | shm_destroy(ns, shp); | |
99 | } | |
100 | ||
4e982311 KK |
101 | int shm_init_ns(struct ipc_namespace *ns) |
102 | { | |
103 | struct ipc_ids *ids; | |
104 | ||
105 | ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL); | |
106 | if (ids == NULL) | |
107 | return -ENOMEM; | |
1da177e4 | 108 | |
4e982311 KK |
109 | __shm_init_ns(ns, ids); |
110 | return 0; | |
111 | } | |
112 | ||
113 | void shm_exit_ns(struct ipc_namespace *ns) | |
114 | { | |
115 | int i; | |
116 | struct shmid_kernel *shp; | |
117 | ||
118 | mutex_lock(&shm_ids(ns).mutex); | |
119 | for (i = 0; i <= shm_ids(ns).max_id; i++) { | |
120 | shp = shm_lock(ns, i); | |
121 | if (shp == NULL) | |
122 | continue; | |
123 | ||
124 | do_shm_rmid(ns, shp); | |
125 | } | |
126 | mutex_unlock(&shm_ids(ns).mutex); | |
127 | ||
c7e12b83 | 128 | ipc_fini_ids(ns->ids[IPC_SHM_IDS]); |
4e982311 KK |
129 | kfree(ns->ids[IPC_SHM_IDS]); |
130 | ns->ids[IPC_SHM_IDS] = NULL; | |
131 | } | |
1da177e4 LT |
132 | |
133 | void __init shm_init (void) | |
134 | { | |
4e982311 | 135 | __shm_init_ns(&init_ipc_ns, &init_shm_ids); |
19b4946c MW |
136 | ipc_init_proc_interface("sysvipc/shm", |
137 | " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n", | |
4e982311 | 138 | IPC_SHM_IDS, sysvipc_shm_proc_show); |
1da177e4 LT |
139 | } |
140 | ||
4e982311 KK |
141 | static inline int shm_checkid(struct ipc_namespace *ns, |
142 | struct shmid_kernel *s, int id) | |
1da177e4 | 143 | { |
4e982311 | 144 | if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id)) |
1da177e4 LT |
145 | return -EIDRM; |
146 | return 0; | |
147 | } | |
148 | ||
4e982311 | 149 | static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id) |
1da177e4 | 150 | { |
4e982311 | 151 | return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id); |
1da177e4 LT |
152 | } |
153 | ||
4e982311 | 154 | static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp) |
1da177e4 | 155 | { |
4e982311 | 156 | return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); |
1da177e4 LT |
157 | } |
158 | ||
159 | ||
160 | ||
bc56bba8 EB |
161 | /* This is called by fork, once for every shm attach. */ |
162 | static void shm_open(struct vm_area_struct *vma) | |
4e982311 | 163 | { |
bc56bba8 EB |
164 | struct file *file = vma->vm_file; |
165 | struct shm_file_data *sfd = shm_file_data(file); | |
1da177e4 LT |
166 | struct shmid_kernel *shp; |
167 | ||
bc56bba8 | 168 | shp = shm_lock(sfd->ns, sfd->id); |
9ba025f1 | 169 | BUG_ON(!shp); |
1da177e4 | 170 | shp->shm_atim = get_seconds(); |
b488893a | 171 | shp->shm_lprid = task_tgid_vnr(current); |
1da177e4 LT |
172 | shp->shm_nattch++; |
173 | shm_unlock(shp); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * shm_destroy - free the struct shmid_kernel | |
178 | * | |
179 | * @shp: struct to free | |
180 | * | |
5f921ae9 | 181 | * It has to be called with shp and shm_ids.mutex locked, |
1da177e4 LT |
182 | * but returns with shp unlocked and freed. |
183 | */ | |
4e982311 | 184 | static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
1da177e4 | 185 | { |
4e982311 KK |
186 | ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
187 | shm_rmid(ns, shp->id); | |
1da177e4 LT |
188 | shm_unlock(shp); |
189 | if (!is_file_hugepages(shp->shm_file)) | |
190 | shmem_lock(shp->shm_file, 0, shp->mlock_user); | |
191 | else | |
6d63079a | 192 | user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size, |
1da177e4 LT |
193 | shp->mlock_user); |
194 | fput (shp->shm_file); | |
195 | security_shm_free(shp); | |
196 | ipc_rcu_putref(shp); | |
197 | } | |
198 | ||
199 | /* | |
bc56bba8 | 200 | * remove the attach descriptor vma. |
1da177e4 LT |
201 | * free memory for segment if it is marked destroyed. |
202 | * The descriptor has already been removed from the current->mm->mmap list | |
203 | * and will later be kfree()d. | |
204 | */ | |
bc56bba8 | 205 | static void shm_close(struct vm_area_struct *vma) |
1da177e4 | 206 | { |
bc56bba8 EB |
207 | struct file * file = vma->vm_file; |
208 | struct shm_file_data *sfd = shm_file_data(file); | |
1da177e4 | 209 | struct shmid_kernel *shp; |
bc56bba8 | 210 | struct ipc_namespace *ns = sfd->ns; |
4e982311 KK |
211 | |
212 | mutex_lock(&shm_ids(ns).mutex); | |
1da177e4 | 213 | /* remove from the list of attaches of the shm segment */ |
bc56bba8 | 214 | shp = shm_lock(ns, sfd->id); |
9ba025f1 | 215 | BUG_ON(!shp); |
b488893a | 216 | shp->shm_lprid = task_tgid_vnr(current); |
1da177e4 LT |
217 | shp->shm_dtim = get_seconds(); |
218 | shp->shm_nattch--; | |
219 | if(shp->shm_nattch == 0 && | |
b33291c0 | 220 | shp->shm_perm.mode & SHM_DEST) |
4e982311 | 221 | shm_destroy(ns, shp); |
1da177e4 LT |
222 | else |
223 | shm_unlock(shp); | |
4e982311 | 224 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 LT |
225 | } |
226 | ||
d0217ac0 | 227 | static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
bc56bba8 EB |
228 | { |
229 | struct file *file = vma->vm_file; | |
230 | struct shm_file_data *sfd = shm_file_data(file); | |
231 | ||
d0217ac0 | 232 | return sfd->vm_ops->fault(vma, vmf); |
bc56bba8 EB |
233 | } |
234 | ||
235 | #ifdef CONFIG_NUMA | |
d823e3e7 | 236 | static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) |
bc56bba8 EB |
237 | { |
238 | struct file *file = vma->vm_file; | |
239 | struct shm_file_data *sfd = shm_file_data(file); | |
240 | int err = 0; | |
241 | if (sfd->vm_ops->set_policy) | |
242 | err = sfd->vm_ops->set_policy(vma, new); | |
243 | return err; | |
244 | } | |
245 | ||
d823e3e7 AB |
246 | static struct mempolicy *shm_get_policy(struct vm_area_struct *vma, |
247 | unsigned long addr) | |
bc56bba8 EB |
248 | { |
249 | struct file *file = vma->vm_file; | |
250 | struct shm_file_data *sfd = shm_file_data(file); | |
251 | struct mempolicy *pol = NULL; | |
252 | ||
253 | if (sfd->vm_ops->get_policy) | |
254 | pol = sfd->vm_ops->get_policy(vma, addr); | |
22741925 | 255 | else if (vma->vm_policy) |
bc56bba8 | 256 | pol = vma->vm_policy; |
22741925 AL |
257 | else |
258 | pol = current->mempolicy; | |
bc56bba8 EB |
259 | return pol; |
260 | } | |
261 | #endif | |
262 | ||
1da177e4 LT |
263 | static int shm_mmap(struct file * file, struct vm_area_struct * vma) |
264 | { | |
bc56bba8 | 265 | struct shm_file_data *sfd = shm_file_data(file); |
b0e15190 DH |
266 | int ret; |
267 | ||
bc56bba8 EB |
268 | ret = sfd->file->f_op->mmap(sfd->file, vma); |
269 | if (ret != 0) | |
270 | return ret; | |
271 | sfd->vm_ops = vma->vm_ops; | |
2e92a3ba | 272 | #ifdef CONFIG_MMU |
54cb8821 | 273 | BUG_ON(!sfd->vm_ops->fault); |
2e92a3ba | 274 | #endif |
bc56bba8 EB |
275 | vma->vm_ops = &shm_vm_ops; |
276 | shm_open(vma); | |
b0e15190 DH |
277 | |
278 | return ret; | |
1da177e4 LT |
279 | } |
280 | ||
4e982311 KK |
281 | static int shm_release(struct inode *ino, struct file *file) |
282 | { | |
bc56bba8 | 283 | struct shm_file_data *sfd = shm_file_data(file); |
4e982311 | 284 | |
bc56bba8 EB |
285 | put_ipc_ns(sfd->ns); |
286 | shm_file_data(file) = NULL; | |
287 | kfree(sfd); | |
4e982311 KK |
288 | return 0; |
289 | } | |
290 | ||
516dffdc AL |
291 | static int shm_fsync(struct file *file, struct dentry *dentry, int datasync) |
292 | { | |
293 | int (*fsync) (struct file *, struct dentry *, int datasync); | |
294 | struct shm_file_data *sfd = shm_file_data(file); | |
295 | int ret = -EINVAL; | |
296 | ||
297 | fsync = sfd->file->f_op->fsync; | |
298 | if (fsync) | |
299 | ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync); | |
300 | return ret; | |
301 | } | |
302 | ||
bc56bba8 EB |
303 | static unsigned long shm_get_unmapped_area(struct file *file, |
304 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
305 | unsigned long flags) | |
306 | { | |
307 | struct shm_file_data *sfd = shm_file_data(file); | |
516dffdc AL |
308 | return get_unmapped_area(sfd->file, addr, len, pgoff, flags); |
309 | } | |
310 | ||
311 | int is_file_shm_hugepages(struct file *file) | |
312 | { | |
313 | int ret = 0; | |
314 | ||
315 | if (file->f_op == &shm_file_operations) { | |
316 | struct shm_file_data *sfd; | |
317 | sfd = shm_file_data(file); | |
318 | ret = is_file_hugepages(sfd->file); | |
319 | } | |
320 | return ret; | |
bc56bba8 | 321 | } |
bc56bba8 | 322 | |
9a32144e | 323 | static const struct file_operations shm_file_operations = { |
4e982311 | 324 | .mmap = shm_mmap, |
516dffdc | 325 | .fsync = shm_fsync, |
4e982311 | 326 | .release = shm_release, |
bc56bba8 | 327 | .get_unmapped_area = shm_get_unmapped_area, |
1da177e4 LT |
328 | }; |
329 | ||
330 | static struct vm_operations_struct shm_vm_ops = { | |
331 | .open = shm_open, /* callback for a new vm-area open */ | |
332 | .close = shm_close, /* callback for when the vm-area is released */ | |
54cb8821 | 333 | .fault = shm_fault, |
bc56bba8 EB |
334 | #if defined(CONFIG_NUMA) |
335 | .set_policy = shm_set_policy, | |
336 | .get_policy = shm_get_policy, | |
1da177e4 LT |
337 | #endif |
338 | }; | |
339 | ||
4e982311 | 340 | static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size) |
1da177e4 LT |
341 | { |
342 | int error; | |
343 | struct shmid_kernel *shp; | |
344 | int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
345 | struct file * file; | |
346 | char name[13]; | |
347 | int id; | |
348 | ||
4e982311 | 349 | if (size < SHMMIN || size > ns->shm_ctlmax) |
1da177e4 LT |
350 | return -EINVAL; |
351 | ||
f66d45e9 | 352 | if (ns->shm_tot + numpages > ns->shm_ctlall) |
1da177e4 LT |
353 | return -ENOSPC; |
354 | ||
355 | shp = ipc_rcu_alloc(sizeof(*shp)); | |
356 | if (!shp) | |
357 | return -ENOMEM; | |
358 | ||
359 | shp->shm_perm.key = key; | |
b33291c0 | 360 | shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
1da177e4 LT |
361 | shp->mlock_user = NULL; |
362 | ||
363 | shp->shm_perm.security = NULL; | |
364 | error = security_shm_alloc(shp); | |
365 | if (error) { | |
366 | ipc_rcu_putref(shp); | |
367 | return error; | |
368 | } | |
369 | ||
9d66586f | 370 | sprintf (name, "SYSV%08x", key); |
1da177e4 | 371 | if (shmflg & SHM_HUGETLB) { |
9d66586f EB |
372 | /* hugetlb_file_setup takes care of mlock user accounting */ |
373 | file = hugetlb_file_setup(name, size); | |
1da177e4 LT |
374 | shp->mlock_user = current->user; |
375 | } else { | |
bf8f972d BP |
376 | int acctflag = VM_ACCOUNT; |
377 | /* | |
378 | * Do not allow no accounting for OVERCOMMIT_NEVER, even | |
379 | * if it's asked for. | |
380 | */ | |
381 | if ((shmflg & SHM_NORESERVE) && | |
382 | sysctl_overcommit_memory != OVERCOMMIT_NEVER) | |
383 | acctflag = 0; | |
bf8f972d | 384 | file = shmem_file_setup(name, size, acctflag); |
1da177e4 LT |
385 | } |
386 | error = PTR_ERR(file); | |
387 | if (IS_ERR(file)) | |
388 | goto no_file; | |
389 | ||
390 | error = -ENOSPC; | |
4e982311 | 391 | id = shm_addid(ns, shp); |
1da177e4 LT |
392 | if(id == -1) |
393 | goto no_id; | |
394 | ||
b488893a | 395 | shp->shm_cprid = task_tgid_vnr(current); |
1da177e4 LT |
396 | shp->shm_lprid = 0; |
397 | shp->shm_atim = shp->shm_dtim = 0; | |
398 | shp->shm_ctim = get_seconds(); | |
399 | shp->shm_segsz = size; | |
400 | shp->shm_nattch = 0; | |
4e982311 | 401 | shp->id = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4 | 402 | shp->shm_file = file; |
30475cc1 BP |
403 | /* |
404 | * shmid gets reported as "inode#" in /proc/pid/maps. | |
405 | * proc-ps tools use this. Changing this will break them. | |
406 | */ | |
407 | file->f_dentry->d_inode->i_ino = shp->id; | |
551110a9 | 408 | |
4e982311 | 409 | ns->shm_tot += numpages; |
1da177e4 LT |
410 | shm_unlock(shp); |
411 | return shp->id; | |
412 | ||
413 | no_id: | |
414 | fput(file); | |
415 | no_file: | |
416 | security_shm_free(shp); | |
417 | ipc_rcu_putref(shp); | |
418 | return error; | |
419 | } | |
420 | ||
421 | asmlinkage long sys_shmget (key_t key, size_t size, int shmflg) | |
422 | { | |
423 | struct shmid_kernel *shp; | |
424 | int err, id = 0; | |
4e982311 KK |
425 | struct ipc_namespace *ns; |
426 | ||
427 | ns = current->nsproxy->ipc_ns; | |
1da177e4 | 428 | |
4e982311 | 429 | mutex_lock(&shm_ids(ns).mutex); |
1da177e4 | 430 | if (key == IPC_PRIVATE) { |
4e982311 KK |
431 | err = newseg(ns, key, shmflg, size); |
432 | } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) { | |
1da177e4 LT |
433 | if (!(shmflg & IPC_CREAT)) |
434 | err = -ENOENT; | |
435 | else | |
4e982311 | 436 | err = newseg(ns, key, shmflg, size); |
1da177e4 LT |
437 | } else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) { |
438 | err = -EEXIST; | |
439 | } else { | |
4e982311 | 440 | shp = shm_lock(ns, id); |
9ba025f1 | 441 | BUG_ON(shp==NULL); |
1da177e4 LT |
442 | if (shp->shm_segsz < size) |
443 | err = -EINVAL; | |
444 | else if (ipcperms(&shp->shm_perm, shmflg)) | |
445 | err = -EACCES; | |
446 | else { | |
4e982311 | 447 | int shmid = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4 LT |
448 | err = security_shm_associate(shp, shmflg); |
449 | if (!err) | |
450 | err = shmid; | |
451 | } | |
452 | shm_unlock(shp); | |
453 | } | |
4e982311 | 454 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 LT |
455 | |
456 | return err; | |
457 | } | |
458 | ||
459 | static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) | |
460 | { | |
461 | switch(version) { | |
462 | case IPC_64: | |
463 | return copy_to_user(buf, in, sizeof(*in)); | |
464 | case IPC_OLD: | |
465 | { | |
466 | struct shmid_ds out; | |
467 | ||
468 | ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); | |
469 | out.shm_segsz = in->shm_segsz; | |
470 | out.shm_atime = in->shm_atime; | |
471 | out.shm_dtime = in->shm_dtime; | |
472 | out.shm_ctime = in->shm_ctime; | |
473 | out.shm_cpid = in->shm_cpid; | |
474 | out.shm_lpid = in->shm_lpid; | |
475 | out.shm_nattch = in->shm_nattch; | |
476 | ||
477 | return copy_to_user(buf, &out, sizeof(out)); | |
478 | } | |
479 | default: | |
480 | return -EINVAL; | |
481 | } | |
482 | } | |
483 | ||
484 | struct shm_setbuf { | |
485 | uid_t uid; | |
486 | gid_t gid; | |
487 | mode_t mode; | |
488 | }; | |
489 | ||
490 | static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version) | |
491 | { | |
492 | switch(version) { | |
493 | case IPC_64: | |
494 | { | |
495 | struct shmid64_ds tbuf; | |
496 | ||
497 | if (copy_from_user(&tbuf, buf, sizeof(tbuf))) | |
498 | return -EFAULT; | |
499 | ||
500 | out->uid = tbuf.shm_perm.uid; | |
501 | out->gid = tbuf.shm_perm.gid; | |
b33291c0 | 502 | out->mode = tbuf.shm_perm.mode; |
1da177e4 LT |
503 | |
504 | return 0; | |
505 | } | |
506 | case IPC_OLD: | |
507 | { | |
508 | struct shmid_ds tbuf_old; | |
509 | ||
510 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) | |
511 | return -EFAULT; | |
512 | ||
513 | out->uid = tbuf_old.shm_perm.uid; | |
514 | out->gid = tbuf_old.shm_perm.gid; | |
b33291c0 | 515 | out->mode = tbuf_old.shm_perm.mode; |
1da177e4 LT |
516 | |
517 | return 0; | |
518 | } | |
519 | default: | |
520 | return -EINVAL; | |
521 | } | |
522 | } | |
523 | ||
524 | static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) | |
525 | { | |
526 | switch(version) { | |
527 | case IPC_64: | |
528 | return copy_to_user(buf, in, sizeof(*in)); | |
529 | case IPC_OLD: | |
530 | { | |
531 | struct shminfo out; | |
532 | ||
533 | if(in->shmmax > INT_MAX) | |
534 | out.shmmax = INT_MAX; | |
535 | else | |
536 | out.shmmax = (int)in->shmmax; | |
537 | ||
538 | out.shmmin = in->shmmin; | |
539 | out.shmmni = in->shmmni; | |
540 | out.shmseg = in->shmseg; | |
541 | out.shmall = in->shmall; | |
542 | ||
543 | return copy_to_user(buf, &out, sizeof(out)); | |
544 | } | |
545 | default: | |
546 | return -EINVAL; | |
547 | } | |
548 | } | |
549 | ||
4e982311 KK |
550 | static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, |
551 | unsigned long *swp) | |
1da177e4 LT |
552 | { |
553 | int i; | |
554 | ||
555 | *rss = 0; | |
556 | *swp = 0; | |
557 | ||
4e982311 | 558 | for (i = 0; i <= shm_ids(ns).max_id; i++) { |
1da177e4 LT |
559 | struct shmid_kernel *shp; |
560 | struct inode *inode; | |
561 | ||
4e982311 | 562 | shp = shm_get(ns, i); |
1da177e4 LT |
563 | if(!shp) |
564 | continue; | |
565 | ||
6d63079a | 566 | inode = shp->shm_file->f_path.dentry->d_inode; |
1da177e4 LT |
567 | |
568 | if (is_file_hugepages(shp->shm_file)) { | |
569 | struct address_space *mapping = inode->i_mapping; | |
570 | *rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages; | |
571 | } else { | |
572 | struct shmem_inode_info *info = SHMEM_I(inode); | |
573 | spin_lock(&info->lock); | |
574 | *rss += inode->i_mapping->nrpages; | |
575 | *swp += info->swapped; | |
576 | spin_unlock(&info->lock); | |
577 | } | |
578 | } | |
579 | } | |
580 | ||
581 | asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf) | |
582 | { | |
583 | struct shm_setbuf setbuf; | |
584 | struct shmid_kernel *shp; | |
585 | int err, version; | |
4e982311 | 586 | struct ipc_namespace *ns; |
1da177e4 LT |
587 | |
588 | if (cmd < 0 || shmid < 0) { | |
589 | err = -EINVAL; | |
590 | goto out; | |
591 | } | |
592 | ||
593 | version = ipc_parse_version(&cmd); | |
4e982311 | 594 | ns = current->nsproxy->ipc_ns; |
1da177e4 LT |
595 | |
596 | switch (cmd) { /* replace with proc interface ? */ | |
597 | case IPC_INFO: | |
598 | { | |
599 | struct shminfo64 shminfo; | |
600 | ||
601 | err = security_shm_shmctl(NULL, cmd); | |
602 | if (err) | |
603 | return err; | |
604 | ||
605 | memset(&shminfo,0,sizeof(shminfo)); | |
4e982311 KK |
606 | shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; |
607 | shminfo.shmmax = ns->shm_ctlmax; | |
608 | shminfo.shmall = ns->shm_ctlall; | |
1da177e4 LT |
609 | |
610 | shminfo.shmmin = SHMMIN; | |
611 | if(copy_shminfo_to_user (buf, &shminfo, version)) | |
612 | return -EFAULT; | |
613 | /* reading a integer is always atomic */ | |
4e982311 | 614 | err= shm_ids(ns).max_id; |
1da177e4 LT |
615 | if(err<0) |
616 | err = 0; | |
617 | goto out; | |
618 | } | |
619 | case SHM_INFO: | |
620 | { | |
621 | struct shm_info shm_info; | |
622 | ||
623 | err = security_shm_shmctl(NULL, cmd); | |
624 | if (err) | |
625 | return err; | |
626 | ||
627 | memset(&shm_info,0,sizeof(shm_info)); | |
4e982311 KK |
628 | mutex_lock(&shm_ids(ns).mutex); |
629 | shm_info.used_ids = shm_ids(ns).in_use; | |
630 | shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp); | |
631 | shm_info.shm_tot = ns->shm_tot; | |
1da177e4 LT |
632 | shm_info.swap_attempts = 0; |
633 | shm_info.swap_successes = 0; | |
4e982311 KK |
634 | err = shm_ids(ns).max_id; |
635 | mutex_unlock(&shm_ids(ns).mutex); | |
1da177e4 LT |
636 | if(copy_to_user (buf, &shm_info, sizeof(shm_info))) { |
637 | err = -EFAULT; | |
638 | goto out; | |
639 | } | |
640 | ||
641 | err = err < 0 ? 0 : err; | |
642 | goto out; | |
643 | } | |
644 | case SHM_STAT: | |
645 | case IPC_STAT: | |
646 | { | |
647 | struct shmid64_ds tbuf; | |
648 | int result; | |
649 | memset(&tbuf, 0, sizeof(tbuf)); | |
4e982311 | 650 | shp = shm_lock(ns, shmid); |
1da177e4 LT |
651 | if(shp==NULL) { |
652 | err = -EINVAL; | |
653 | goto out; | |
654 | } else if(cmd==SHM_STAT) { | |
655 | err = -EINVAL; | |
4e982311 | 656 | if (shmid > shm_ids(ns).max_id) |
1da177e4 | 657 | goto out_unlock; |
4e982311 | 658 | result = shm_buildid(ns, shmid, shp->shm_perm.seq); |
1da177e4 | 659 | } else { |
4e982311 | 660 | err = shm_checkid(ns, shp,shmid); |
1da177e4 LT |
661 | if(err) |
662 | goto out_unlock; | |
663 | result = 0; | |
664 | } | |
665 | err=-EACCES; | |
666 | if (ipcperms (&shp->shm_perm, S_IRUGO)) | |
667 | goto out_unlock; | |
668 | err = security_shm_shmctl(shp, cmd); | |
669 | if (err) | |
670 | goto out_unlock; | |
671 | kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm); | |
672 | tbuf.shm_segsz = shp->shm_segsz; | |
673 | tbuf.shm_atime = shp->shm_atim; | |
674 | tbuf.shm_dtime = shp->shm_dtim; | |
675 | tbuf.shm_ctime = shp->shm_ctim; | |
676 | tbuf.shm_cpid = shp->shm_cprid; | |
677 | tbuf.shm_lpid = shp->shm_lprid; | |
bc56bba8 | 678 | tbuf.shm_nattch = shp->shm_nattch; |
1da177e4 LT |
679 | shm_unlock(shp); |
680 | if(copy_shmid_to_user (buf, &tbuf, version)) | |
681 | err = -EFAULT; | |
682 | else | |
683 | err = result; | |
684 | goto out; | |
685 | } | |
686 | case SHM_LOCK: | |
687 | case SHM_UNLOCK: | |
688 | { | |
4e982311 | 689 | shp = shm_lock(ns, shmid); |
1da177e4 LT |
690 | if(shp==NULL) { |
691 | err = -EINVAL; | |
692 | goto out; | |
693 | } | |
4e982311 | 694 | err = shm_checkid(ns, shp,shmid); |
1da177e4 LT |
695 | if(err) |
696 | goto out_unlock; | |
697 | ||
073115d6 SG |
698 | err = audit_ipc_obj(&(shp->shm_perm)); |
699 | if (err) | |
700 | goto out_unlock; | |
701 | ||
1da177e4 LT |
702 | if (!capable(CAP_IPC_LOCK)) { |
703 | err = -EPERM; | |
704 | if (current->euid != shp->shm_perm.uid && | |
705 | current->euid != shp->shm_perm.cuid) | |
706 | goto out_unlock; | |
707 | if (cmd == SHM_LOCK && | |
708 | !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur) | |
709 | goto out_unlock; | |
710 | } | |
711 | ||
712 | err = security_shm_shmctl(shp, cmd); | |
713 | if (err) | |
714 | goto out_unlock; | |
715 | ||
716 | if(cmd==SHM_LOCK) { | |
717 | struct user_struct * user = current->user; | |
718 | if (!is_file_hugepages(shp->shm_file)) { | |
719 | err = shmem_lock(shp->shm_file, 1, user); | |
7be77e20 | 720 | if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){ |
b33291c0 | 721 | shp->shm_perm.mode |= SHM_LOCKED; |
1da177e4 LT |
722 | shp->mlock_user = user; |
723 | } | |
724 | } | |
725 | } else if (!is_file_hugepages(shp->shm_file)) { | |
726 | shmem_lock(shp->shm_file, 0, shp->mlock_user); | |
b33291c0 | 727 | shp->shm_perm.mode &= ~SHM_LOCKED; |
1da177e4 LT |
728 | shp->mlock_user = NULL; |
729 | } | |
730 | shm_unlock(shp); | |
731 | goto out; | |
732 | } | |
733 | case IPC_RMID: | |
734 | { | |
735 | /* | |
736 | * We cannot simply remove the file. The SVID states | |
737 | * that the block remains until the last person | |
738 | * detaches from it, then is deleted. A shmat() on | |
739 | * an RMID segment is legal in older Linux and if | |
740 | * we change it apps break... | |
741 | * | |
742 | * Instead we set a destroyed flag, and then blow | |
743 | * the name away when the usage hits zero. | |
744 | */ | |
4e982311 KK |
745 | mutex_lock(&shm_ids(ns).mutex); |
746 | shp = shm_lock(ns, shmid); | |
1da177e4 LT |
747 | err = -EINVAL; |
748 | if (shp == NULL) | |
749 | goto out_up; | |
4e982311 | 750 | err = shm_checkid(ns, shp, shmid); |
1da177e4 LT |
751 | if(err) |
752 | goto out_unlock_up; | |
753 | ||
073115d6 SG |
754 | err = audit_ipc_obj(&(shp->shm_perm)); |
755 | if (err) | |
756 | goto out_unlock_up; | |
757 | ||
1da177e4 LT |
758 | if (current->euid != shp->shm_perm.uid && |
759 | current->euid != shp->shm_perm.cuid && | |
760 | !capable(CAP_SYS_ADMIN)) { | |
761 | err=-EPERM; | |
762 | goto out_unlock_up; | |
763 | } | |
764 | ||
765 | err = security_shm_shmctl(shp, cmd); | |
766 | if (err) | |
767 | goto out_unlock_up; | |
768 | ||
4e982311 KK |
769 | do_shm_rmid(ns, shp); |
770 | mutex_unlock(&shm_ids(ns).mutex); | |
1da177e4 LT |
771 | goto out; |
772 | } | |
773 | ||
774 | case IPC_SET: | |
775 | { | |
776 | if (copy_shmid_from_user (&setbuf, buf, version)) { | |
777 | err = -EFAULT; | |
778 | goto out; | |
779 | } | |
4e982311 KK |
780 | mutex_lock(&shm_ids(ns).mutex); |
781 | shp = shm_lock(ns, shmid); | |
1da177e4 LT |
782 | err=-EINVAL; |
783 | if(shp==NULL) | |
784 | goto out_up; | |
4e982311 | 785 | err = shm_checkid(ns, shp,shmid); |
1da177e4 LT |
786 | if(err) |
787 | goto out_unlock_up; | |
073115d6 SG |
788 | err = audit_ipc_obj(&(shp->shm_perm)); |
789 | if (err) | |
790 | goto out_unlock_up; | |
ac03221a | 791 | err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode); |
073115d6 SG |
792 | if (err) |
793 | goto out_unlock_up; | |
1da177e4 LT |
794 | err=-EPERM; |
795 | if (current->euid != shp->shm_perm.uid && | |
796 | current->euid != shp->shm_perm.cuid && | |
797 | !capable(CAP_SYS_ADMIN)) { | |
798 | goto out_unlock_up; | |
799 | } | |
800 | ||
801 | err = security_shm_shmctl(shp, cmd); | |
802 | if (err) | |
803 | goto out_unlock_up; | |
804 | ||
805 | shp->shm_perm.uid = setbuf.uid; | |
806 | shp->shm_perm.gid = setbuf.gid; | |
b33291c0 | 807 | shp->shm_perm.mode = (shp->shm_perm.mode & ~S_IRWXUGO) |
1da177e4 LT |
808 | | (setbuf.mode & S_IRWXUGO); |
809 | shp->shm_ctim = get_seconds(); | |
810 | break; | |
811 | } | |
812 | ||
813 | default: | |
814 | err = -EINVAL; | |
815 | goto out; | |
816 | } | |
817 | ||
818 | err = 0; | |
819 | out_unlock_up: | |
820 | shm_unlock(shp); | |
821 | out_up: | |
4e982311 | 822 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 LT |
823 | goto out; |
824 | out_unlock: | |
825 | shm_unlock(shp); | |
826 | out: | |
827 | return err; | |
828 | } | |
829 | ||
830 | /* | |
831 | * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. | |
832 | * | |
833 | * NOTE! Despite the name, this is NOT a direct system call entrypoint. The | |
834 | * "raddr" thing points to kernel space, and there has to be a wrapper around | |
835 | * this. | |
836 | */ | |
837 | long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr) | |
838 | { | |
839 | struct shmid_kernel *shp; | |
840 | unsigned long addr; | |
841 | unsigned long size; | |
842 | struct file * file; | |
843 | int err; | |
844 | unsigned long flags; | |
845 | unsigned long prot; | |
1da177e4 | 846 | int acc_mode; |
bc56bba8 | 847 | unsigned long user_addr; |
4e982311 | 848 | struct ipc_namespace *ns; |
bc56bba8 EB |
849 | struct shm_file_data *sfd; |
850 | struct path path; | |
851 | mode_t f_mode; | |
1da177e4 | 852 | |
bc56bba8 EB |
853 | err = -EINVAL; |
854 | if (shmid < 0) | |
1da177e4 | 855 | goto out; |
bc56bba8 | 856 | else if ((addr = (ulong)shmaddr)) { |
1da177e4 LT |
857 | if (addr & (SHMLBA-1)) { |
858 | if (shmflg & SHM_RND) | |
859 | addr &= ~(SHMLBA-1); /* round down */ | |
860 | else | |
861 | #ifndef __ARCH_FORCE_SHMLBA | |
862 | if (addr & ~PAGE_MASK) | |
863 | #endif | |
bc56bba8 | 864 | goto out; |
1da177e4 LT |
865 | } |
866 | flags = MAP_SHARED | MAP_FIXED; | |
867 | } else { | |
868 | if ((shmflg & SHM_REMAP)) | |
bc56bba8 | 869 | goto out; |
1da177e4 LT |
870 | |
871 | flags = MAP_SHARED; | |
872 | } | |
873 | ||
874 | if (shmflg & SHM_RDONLY) { | |
875 | prot = PROT_READ; | |
1da177e4 | 876 | acc_mode = S_IRUGO; |
bc56bba8 | 877 | f_mode = FMODE_READ; |
1da177e4 LT |
878 | } else { |
879 | prot = PROT_READ | PROT_WRITE; | |
1da177e4 | 880 | acc_mode = S_IRUGO | S_IWUGO; |
bc56bba8 | 881 | f_mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
882 | } |
883 | if (shmflg & SHM_EXEC) { | |
884 | prot |= PROT_EXEC; | |
885 | acc_mode |= S_IXUGO; | |
886 | } | |
887 | ||
888 | /* | |
889 | * We cannot rely on the fs check since SYSV IPC does have an | |
890 | * additional creator id... | |
891 | */ | |
4e982311 KK |
892 | ns = current->nsproxy->ipc_ns; |
893 | shp = shm_lock(ns, shmid); | |
bc56bba8 | 894 | if(shp == NULL) |
1da177e4 | 895 | goto out; |
bc56bba8 | 896 | |
4e982311 | 897 | err = shm_checkid(ns, shp,shmid); |
bc56bba8 EB |
898 | if (err) |
899 | goto out_unlock; | |
900 | ||
901 | err = -EACCES; | |
902 | if (ipcperms(&shp->shm_perm, acc_mode)) | |
903 | goto out_unlock; | |
1da177e4 LT |
904 | |
905 | err = security_shm_shmat(shp, shmaddr, shmflg); | |
bc56bba8 EB |
906 | if (err) |
907 | goto out_unlock; | |
908 | ||
909 | path.dentry = dget(shp->shm_file->f_path.dentry); | |
ce8d2cdf | 910 | path.mnt = shp->shm_file->f_path.mnt; |
1da177e4 | 911 | shp->shm_nattch++; |
bc56bba8 | 912 | size = i_size_read(path.dentry->d_inode); |
1da177e4 LT |
913 | shm_unlock(shp); |
914 | ||
bc56bba8 EB |
915 | err = -ENOMEM; |
916 | sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); | |
917 | if (!sfd) | |
ce8d2cdf | 918 | goto out_put_dentry; |
bc56bba8 EB |
919 | |
920 | err = -ENOMEM; | |
ce8d2cdf DH |
921 | |
922 | file = alloc_file(path.mnt, path.dentry, f_mode, &shm_file_operations); | |
bc56bba8 EB |
923 | if (!file) |
924 | goto out_free; | |
925 | ||
bc56bba8 | 926 | file->private_data = sfd; |
bc56bba8 | 927 | file->f_mapping = shp->shm_file->f_mapping; |
bc56bba8 EB |
928 | sfd->id = shp->id; |
929 | sfd->ns = get_ipc_ns(ns); | |
930 | sfd->file = shp->shm_file; | |
931 | sfd->vm_ops = NULL; | |
932 | ||
1da177e4 LT |
933 | down_write(¤t->mm->mmap_sem); |
934 | if (addr && !(shmflg & SHM_REMAP)) { | |
bc56bba8 | 935 | err = -EINVAL; |
1da177e4 LT |
936 | if (find_vma_intersection(current->mm, addr, addr + size)) |
937 | goto invalid; | |
938 | /* | |
939 | * If shm segment goes below stack, make sure there is some | |
940 | * space left for the stack to grow (at least 4 pages). | |
941 | */ | |
942 | if (addr < current->mm->start_stack && | |
943 | addr > current->mm->start_stack - size - PAGE_SIZE * 5) | |
944 | goto invalid; | |
945 | } | |
946 | ||
bc56bba8 EB |
947 | user_addr = do_mmap (file, addr, size, prot, flags, 0); |
948 | *raddr = user_addr; | |
949 | err = 0; | |
950 | if (IS_ERR_VALUE(user_addr)) | |
951 | err = (long)user_addr; | |
1da177e4 LT |
952 | invalid: |
953 | up_write(¤t->mm->mmap_sem); | |
954 | ||
bc56bba8 EB |
955 | fput(file); |
956 | ||
957 | out_nattch: | |
4e982311 KK |
958 | mutex_lock(&shm_ids(ns).mutex); |
959 | shp = shm_lock(ns, shmid); | |
9ba025f1 | 960 | BUG_ON(!shp); |
1da177e4 LT |
961 | shp->shm_nattch--; |
962 | if(shp->shm_nattch == 0 && | |
b33291c0 | 963 | shp->shm_perm.mode & SHM_DEST) |
4e982311 | 964 | shm_destroy(ns, shp); |
1da177e4 LT |
965 | else |
966 | shm_unlock(shp); | |
4e982311 | 967 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 | 968 | |
1da177e4 LT |
969 | out: |
970 | return err; | |
bc56bba8 EB |
971 | |
972 | out_unlock: | |
973 | shm_unlock(shp); | |
974 | goto out; | |
975 | ||
976 | out_free: | |
977 | kfree(sfd); | |
ce8d2cdf | 978 | out_put_dentry: |
bc56bba8 | 979 | dput(path.dentry); |
bc56bba8 | 980 | goto out_nattch; |
1da177e4 LT |
981 | } |
982 | ||
7d87e14c SR |
983 | asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) |
984 | { | |
985 | unsigned long ret; | |
986 | long err; | |
987 | ||
988 | err = do_shmat(shmid, shmaddr, shmflg, &ret); | |
989 | if (err) | |
990 | return err; | |
991 | force_successful_syscall_return(); | |
992 | return (long)ret; | |
993 | } | |
994 | ||
1da177e4 LT |
995 | /* |
996 | * detach and kill segment if marked destroyed. | |
997 | * The work is done in shm_close. | |
998 | */ | |
999 | asmlinkage long sys_shmdt(char __user *shmaddr) | |
1000 | { | |
1001 | struct mm_struct *mm = current->mm; | |
1002 | struct vm_area_struct *vma, *next; | |
1003 | unsigned long addr = (unsigned long)shmaddr; | |
1004 | loff_t size = 0; | |
1005 | int retval = -EINVAL; | |
1006 | ||
df1e2fb5 HD |
1007 | if (addr & ~PAGE_MASK) |
1008 | return retval; | |
1009 | ||
1da177e4 LT |
1010 | down_write(&mm->mmap_sem); |
1011 | ||
1012 | /* | |
1013 | * This function tries to be smart and unmap shm segments that | |
1014 | * were modified by partial mlock or munmap calls: | |
1015 | * - It first determines the size of the shm segment that should be | |
1016 | * unmapped: It searches for a vma that is backed by shm and that | |
1017 | * started at address shmaddr. It records it's size and then unmaps | |
1018 | * it. | |
1019 | * - Then it unmaps all shm vmas that started at shmaddr and that | |
1020 | * are within the initially determined size. | |
1021 | * Errors from do_munmap are ignored: the function only fails if | |
1022 | * it's called with invalid parameters or if it's called to unmap | |
1023 | * a part of a vma. Both calls in this function are for full vmas, | |
1024 | * the parameters are directly copied from the vma itself and always | |
1025 | * valid - therefore do_munmap cannot fail. (famous last words?) | |
1026 | */ | |
1027 | /* | |
1028 | * If it had been mremap()'d, the starting address would not | |
1029 | * match the usual checks anyway. So assume all vma's are | |
1030 | * above the starting address given. | |
1031 | */ | |
1032 | vma = find_vma(mm, addr); | |
1033 | ||
1034 | while (vma) { | |
1035 | next = vma->vm_next; | |
1036 | ||
1037 | /* | |
1038 | * Check if the starting address would match, i.e. it's | |
1039 | * a fragment created by mprotect() and/or munmap(), or it | |
1040 | * otherwise it starts at this address with no hassles. | |
1041 | */ | |
bc56bba8 | 1042 | if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4 LT |
1043 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
1044 | ||
1045 | ||
6d63079a | 1046 | size = vma->vm_file->f_path.dentry->d_inode->i_size; |
1da177e4 LT |
1047 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); |
1048 | /* | |
1049 | * We discovered the size of the shm segment, so | |
1050 | * break out of here and fall through to the next | |
1051 | * loop that uses the size information to stop | |
1052 | * searching for matching vma's. | |
1053 | */ | |
1054 | retval = 0; | |
1055 | vma = next; | |
1056 | break; | |
1057 | } | |
1058 | vma = next; | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * We need look no further than the maximum address a fragment | |
1063 | * could possibly have landed at. Also cast things to loff_t to | |
1064 | * prevent overflows and make comparisions vs. equal-width types. | |
1065 | */ | |
8e36709d | 1066 | size = PAGE_ALIGN(size); |
1da177e4 LT |
1067 | while (vma && (loff_t)(vma->vm_end - addr) <= size) { |
1068 | next = vma->vm_next; | |
1069 | ||
1070 | /* finding a matching vma now does not alter retval */ | |
bc56bba8 | 1071 | if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4 LT |
1072 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) |
1073 | ||
1074 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); | |
1075 | vma = next; | |
1076 | } | |
1077 | ||
1078 | up_write(&mm->mmap_sem); | |
1079 | return retval; | |
1080 | } | |
1081 | ||
1082 | #ifdef CONFIG_PROC_FS | |
19b4946c | 1083 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1da177e4 | 1084 | { |
19b4946c MW |
1085 | struct shmid_kernel *shp = it; |
1086 | char *format; | |
1da177e4 | 1087 | |
1da177e4 LT |
1088 | #define SMALL_STRING "%10d %10d %4o %10u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n" |
1089 | #define BIG_STRING "%10d %10d %4o %21u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n" | |
1da177e4 | 1090 | |
19b4946c MW |
1091 | if (sizeof(size_t) <= sizeof(int)) |
1092 | format = SMALL_STRING; | |
1093 | else | |
1094 | format = BIG_STRING; | |
1095 | return seq_printf(s, format, | |
1096 | shp->shm_perm.key, | |
1097 | shp->id, | |
b33291c0 | 1098 | shp->shm_perm.mode, |
19b4946c MW |
1099 | shp->shm_segsz, |
1100 | shp->shm_cprid, | |
1101 | shp->shm_lprid, | |
bc56bba8 | 1102 | shp->shm_nattch, |
19b4946c MW |
1103 | shp->shm_perm.uid, |
1104 | shp->shm_perm.gid, | |
1105 | shp->shm_perm.cuid, | |
1106 | shp->shm_perm.cgid, | |
1107 | shp->shm_atim, | |
1108 | shp->shm_dtim, | |
1109 | shp->shm_ctim); | |
1da177e4 LT |
1110 | } |
1111 | #endif |