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Commit | Line | Data |
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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 LT |
170 | shp->shm_atim = get_seconds(); |
171 | shp->shm_lprid = current->tgid; | |
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); |
1da177e4 LT |
216 | shp->shm_lprid = current->tgid; |
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 | |
236 | int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) | |
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 | ||
246 | struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr) | |
247 | { | |
248 | struct file *file = vma->vm_file; | |
249 | struct shm_file_data *sfd = shm_file_data(file); | |
250 | struct mempolicy *pol = NULL; | |
251 | ||
252 | if (sfd->vm_ops->get_policy) | |
253 | pol = sfd->vm_ops->get_policy(vma, addr); | |
22741925 | 254 | else if (vma->vm_policy) |
bc56bba8 | 255 | pol = vma->vm_policy; |
22741925 AL |
256 | else |
257 | pol = current->mempolicy; | |
bc56bba8 EB |
258 | return pol; |
259 | } | |
260 | #endif | |
261 | ||
1da177e4 LT |
262 | static int shm_mmap(struct file * file, struct vm_area_struct * vma) |
263 | { | |
bc56bba8 | 264 | struct shm_file_data *sfd = shm_file_data(file); |
b0e15190 DH |
265 | int ret; |
266 | ||
bc56bba8 EB |
267 | ret = sfd->file->f_op->mmap(sfd->file, vma); |
268 | if (ret != 0) | |
269 | return ret; | |
270 | sfd->vm_ops = vma->vm_ops; | |
2e92a3ba | 271 | #ifdef CONFIG_MMU |
54cb8821 | 272 | BUG_ON(!sfd->vm_ops->fault); |
2e92a3ba | 273 | #endif |
bc56bba8 EB |
274 | vma->vm_ops = &shm_vm_ops; |
275 | shm_open(vma); | |
b0e15190 DH |
276 | |
277 | return ret; | |
1da177e4 LT |
278 | } |
279 | ||
4e982311 KK |
280 | static int shm_release(struct inode *ino, struct file *file) |
281 | { | |
bc56bba8 | 282 | struct shm_file_data *sfd = shm_file_data(file); |
4e982311 | 283 | |
bc56bba8 EB |
284 | put_ipc_ns(sfd->ns); |
285 | shm_file_data(file) = NULL; | |
286 | kfree(sfd); | |
4e982311 KK |
287 | return 0; |
288 | } | |
289 | ||
516dffdc AL |
290 | static int shm_fsync(struct file *file, struct dentry *dentry, int datasync) |
291 | { | |
292 | int (*fsync) (struct file *, struct dentry *, int datasync); | |
293 | struct shm_file_data *sfd = shm_file_data(file); | |
294 | int ret = -EINVAL; | |
295 | ||
296 | fsync = sfd->file->f_op->fsync; | |
297 | if (fsync) | |
298 | ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync); | |
299 | return ret; | |
300 | } | |
301 | ||
bc56bba8 EB |
302 | static unsigned long shm_get_unmapped_area(struct file *file, |
303 | unsigned long addr, unsigned long len, unsigned long pgoff, | |
304 | unsigned long flags) | |
305 | { | |
306 | struct shm_file_data *sfd = shm_file_data(file); | |
516dffdc AL |
307 | return get_unmapped_area(sfd->file, addr, len, pgoff, flags); |
308 | } | |
309 | ||
310 | int is_file_shm_hugepages(struct file *file) | |
311 | { | |
312 | int ret = 0; | |
313 | ||
314 | if (file->f_op == &shm_file_operations) { | |
315 | struct shm_file_data *sfd; | |
316 | sfd = shm_file_data(file); | |
317 | ret = is_file_hugepages(sfd->file); | |
318 | } | |
319 | return ret; | |
bc56bba8 | 320 | } |
bc56bba8 | 321 | |
9a32144e | 322 | static const struct file_operations shm_file_operations = { |
4e982311 | 323 | .mmap = shm_mmap, |
516dffdc | 324 | .fsync = shm_fsync, |
4e982311 | 325 | .release = shm_release, |
bc56bba8 | 326 | .get_unmapped_area = shm_get_unmapped_area, |
1da177e4 LT |
327 | }; |
328 | ||
329 | static struct vm_operations_struct shm_vm_ops = { | |
330 | .open = shm_open, /* callback for a new vm-area open */ | |
331 | .close = shm_close, /* callback for when the vm-area is released */ | |
54cb8821 | 332 | .fault = shm_fault, |
bc56bba8 EB |
333 | #if defined(CONFIG_NUMA) |
334 | .set_policy = shm_set_policy, | |
335 | .get_policy = shm_get_policy, | |
1da177e4 LT |
336 | #endif |
337 | }; | |
338 | ||
4e982311 | 339 | static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size) |
1da177e4 LT |
340 | { |
341 | int error; | |
342 | struct shmid_kernel *shp; | |
343 | int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
344 | struct file * file; | |
345 | char name[13]; | |
346 | int id; | |
347 | ||
4e982311 | 348 | if (size < SHMMIN || size > ns->shm_ctlmax) |
1da177e4 LT |
349 | return -EINVAL; |
350 | ||
f66d45e9 | 351 | if (ns->shm_tot + numpages > ns->shm_ctlall) |
1da177e4 LT |
352 | return -ENOSPC; |
353 | ||
354 | shp = ipc_rcu_alloc(sizeof(*shp)); | |
355 | if (!shp) | |
356 | return -ENOMEM; | |
357 | ||
358 | shp->shm_perm.key = key; | |
b33291c0 | 359 | shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
1da177e4 LT |
360 | shp->mlock_user = NULL; |
361 | ||
362 | shp->shm_perm.security = NULL; | |
363 | error = security_shm_alloc(shp); | |
364 | if (error) { | |
365 | ipc_rcu_putref(shp); | |
366 | return error; | |
367 | } | |
368 | ||
9d66586f | 369 | sprintf (name, "SYSV%08x", key); |
1da177e4 | 370 | if (shmflg & SHM_HUGETLB) { |
9d66586f EB |
371 | /* hugetlb_file_setup takes care of mlock user accounting */ |
372 | file = hugetlb_file_setup(name, size); | |
1da177e4 LT |
373 | shp->mlock_user = current->user; |
374 | } else { | |
bf8f972d BP |
375 | int acctflag = VM_ACCOUNT; |
376 | /* | |
377 | * Do not allow no accounting for OVERCOMMIT_NEVER, even | |
378 | * if it's asked for. | |
379 | */ | |
380 | if ((shmflg & SHM_NORESERVE) && | |
381 | sysctl_overcommit_memory != OVERCOMMIT_NEVER) | |
382 | acctflag = 0; | |
bf8f972d | 383 | file = shmem_file_setup(name, size, acctflag); |
1da177e4 LT |
384 | } |
385 | error = PTR_ERR(file); | |
386 | if (IS_ERR(file)) | |
387 | goto no_file; | |
388 | ||
389 | error = -ENOSPC; | |
4e982311 | 390 | id = shm_addid(ns, shp); |
1da177e4 LT |
391 | if(id == -1) |
392 | goto no_id; | |
393 | ||
394 | shp->shm_cprid = current->tgid; | |
395 | shp->shm_lprid = 0; | |
396 | shp->shm_atim = shp->shm_dtim = 0; | |
397 | shp->shm_ctim = get_seconds(); | |
398 | shp->shm_segsz = size; | |
399 | shp->shm_nattch = 0; | |
4e982311 | 400 | shp->id = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4 | 401 | shp->shm_file = file; |
30475cc1 BP |
402 | /* |
403 | * shmid gets reported as "inode#" in /proc/pid/maps. | |
404 | * proc-ps tools use this. Changing this will break them. | |
405 | */ | |
406 | file->f_dentry->d_inode->i_ino = shp->id; | |
551110a9 | 407 | |
4e982311 | 408 | ns->shm_tot += numpages; |
1da177e4 LT |
409 | shm_unlock(shp); |
410 | return shp->id; | |
411 | ||
412 | no_id: | |
413 | fput(file); | |
414 | no_file: | |
415 | security_shm_free(shp); | |
416 | ipc_rcu_putref(shp); | |
417 | return error; | |
418 | } | |
419 | ||
420 | asmlinkage long sys_shmget (key_t key, size_t size, int shmflg) | |
421 | { | |
422 | struct shmid_kernel *shp; | |
423 | int err, id = 0; | |
4e982311 KK |
424 | struct ipc_namespace *ns; |
425 | ||
426 | ns = current->nsproxy->ipc_ns; | |
1da177e4 | 427 | |
4e982311 | 428 | mutex_lock(&shm_ids(ns).mutex); |
1da177e4 | 429 | if (key == IPC_PRIVATE) { |
4e982311 KK |
430 | err = newseg(ns, key, shmflg, size); |
431 | } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) { | |
1da177e4 LT |
432 | if (!(shmflg & IPC_CREAT)) |
433 | err = -ENOENT; | |
434 | else | |
4e982311 | 435 | err = newseg(ns, key, shmflg, size); |
1da177e4 LT |
436 | } else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) { |
437 | err = -EEXIST; | |
438 | } else { | |
4e982311 | 439 | shp = shm_lock(ns, id); |
9ba025f1 | 440 | BUG_ON(shp==NULL); |
1da177e4 LT |
441 | if (shp->shm_segsz < size) |
442 | err = -EINVAL; | |
443 | else if (ipcperms(&shp->shm_perm, shmflg)) | |
444 | err = -EACCES; | |
445 | else { | |
4e982311 | 446 | int shmid = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4 LT |
447 | err = security_shm_associate(shp, shmflg); |
448 | if (!err) | |
449 | err = shmid; | |
450 | } | |
451 | shm_unlock(shp); | |
452 | } | |
4e982311 | 453 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 LT |
454 | |
455 | return err; | |
456 | } | |
457 | ||
458 | static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) | |
459 | { | |
460 | switch(version) { | |
461 | case IPC_64: | |
462 | return copy_to_user(buf, in, sizeof(*in)); | |
463 | case IPC_OLD: | |
464 | { | |
465 | struct shmid_ds out; | |
466 | ||
467 | ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); | |
468 | out.shm_segsz = in->shm_segsz; | |
469 | out.shm_atime = in->shm_atime; | |
470 | out.shm_dtime = in->shm_dtime; | |
471 | out.shm_ctime = in->shm_ctime; | |
472 | out.shm_cpid = in->shm_cpid; | |
473 | out.shm_lpid = in->shm_lpid; | |
474 | out.shm_nattch = in->shm_nattch; | |
475 | ||
476 | return copy_to_user(buf, &out, sizeof(out)); | |
477 | } | |
478 | default: | |
479 | return -EINVAL; | |
480 | } | |
481 | } | |
482 | ||
483 | struct shm_setbuf { | |
484 | uid_t uid; | |
485 | gid_t gid; | |
486 | mode_t mode; | |
487 | }; | |
488 | ||
489 | static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version) | |
490 | { | |
491 | switch(version) { | |
492 | case IPC_64: | |
493 | { | |
494 | struct shmid64_ds tbuf; | |
495 | ||
496 | if (copy_from_user(&tbuf, buf, sizeof(tbuf))) | |
497 | return -EFAULT; | |
498 | ||
499 | out->uid = tbuf.shm_perm.uid; | |
500 | out->gid = tbuf.shm_perm.gid; | |
b33291c0 | 501 | out->mode = tbuf.shm_perm.mode; |
1da177e4 LT |
502 | |
503 | return 0; | |
504 | } | |
505 | case IPC_OLD: | |
506 | { | |
507 | struct shmid_ds tbuf_old; | |
508 | ||
509 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) | |
510 | return -EFAULT; | |
511 | ||
512 | out->uid = tbuf_old.shm_perm.uid; | |
513 | out->gid = tbuf_old.shm_perm.gid; | |
b33291c0 | 514 | out->mode = tbuf_old.shm_perm.mode; |
1da177e4 LT |
515 | |
516 | return 0; | |
517 | } | |
518 | default: | |
519 | return -EINVAL; | |
520 | } | |
521 | } | |
522 | ||
523 | static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) | |
524 | { | |
525 | switch(version) { | |
526 | case IPC_64: | |
527 | return copy_to_user(buf, in, sizeof(*in)); | |
528 | case IPC_OLD: | |
529 | { | |
530 | struct shminfo out; | |
531 | ||
532 | if(in->shmmax > INT_MAX) | |
533 | out.shmmax = INT_MAX; | |
534 | else | |
535 | out.shmmax = (int)in->shmmax; | |
536 | ||
537 | out.shmmin = in->shmmin; | |
538 | out.shmmni = in->shmmni; | |
539 | out.shmseg = in->shmseg; | |
540 | out.shmall = in->shmall; | |
541 | ||
542 | return copy_to_user(buf, &out, sizeof(out)); | |
543 | } | |
544 | default: | |
545 | return -EINVAL; | |
546 | } | |
547 | } | |
548 | ||
4e982311 KK |
549 | static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, |
550 | unsigned long *swp) | |
1da177e4 LT |
551 | { |
552 | int i; | |
553 | ||
554 | *rss = 0; | |
555 | *swp = 0; | |
556 | ||
4e982311 | 557 | for (i = 0; i <= shm_ids(ns).max_id; i++) { |
1da177e4 LT |
558 | struct shmid_kernel *shp; |
559 | struct inode *inode; | |
560 | ||
4e982311 | 561 | shp = shm_get(ns, i); |
1da177e4 LT |
562 | if(!shp) |
563 | continue; | |
564 | ||
6d63079a | 565 | inode = shp->shm_file->f_path.dentry->d_inode; |
1da177e4 LT |
566 | |
567 | if (is_file_hugepages(shp->shm_file)) { | |
568 | struct address_space *mapping = inode->i_mapping; | |
569 | *rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages; | |
570 | } else { | |
571 | struct shmem_inode_info *info = SHMEM_I(inode); | |
572 | spin_lock(&info->lock); | |
573 | *rss += inode->i_mapping->nrpages; | |
574 | *swp += info->swapped; | |
575 | spin_unlock(&info->lock); | |
576 | } | |
577 | } | |
578 | } | |
579 | ||
580 | asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf) | |
581 | { | |
582 | struct shm_setbuf setbuf; | |
583 | struct shmid_kernel *shp; | |
584 | int err, version; | |
4e982311 | 585 | struct ipc_namespace *ns; |
1da177e4 LT |
586 | |
587 | if (cmd < 0 || shmid < 0) { | |
588 | err = -EINVAL; | |
589 | goto out; | |
590 | } | |
591 | ||
592 | version = ipc_parse_version(&cmd); | |
4e982311 | 593 | ns = current->nsproxy->ipc_ns; |
1da177e4 LT |
594 | |
595 | switch (cmd) { /* replace with proc interface ? */ | |
596 | case IPC_INFO: | |
597 | { | |
598 | struct shminfo64 shminfo; | |
599 | ||
600 | err = security_shm_shmctl(NULL, cmd); | |
601 | if (err) | |
602 | return err; | |
603 | ||
604 | memset(&shminfo,0,sizeof(shminfo)); | |
4e982311 KK |
605 | shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; |
606 | shminfo.shmmax = ns->shm_ctlmax; | |
607 | shminfo.shmall = ns->shm_ctlall; | |
1da177e4 LT |
608 | |
609 | shminfo.shmmin = SHMMIN; | |
610 | if(copy_shminfo_to_user (buf, &shminfo, version)) | |
611 | return -EFAULT; | |
612 | /* reading a integer is always atomic */ | |
4e982311 | 613 | err= shm_ids(ns).max_id; |
1da177e4 LT |
614 | if(err<0) |
615 | err = 0; | |
616 | goto out; | |
617 | } | |
618 | case SHM_INFO: | |
619 | { | |
620 | struct shm_info shm_info; | |
621 | ||
622 | err = security_shm_shmctl(NULL, cmd); | |
623 | if (err) | |
624 | return err; | |
625 | ||
626 | memset(&shm_info,0,sizeof(shm_info)); | |
4e982311 KK |
627 | mutex_lock(&shm_ids(ns).mutex); |
628 | shm_info.used_ids = shm_ids(ns).in_use; | |
629 | shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp); | |
630 | shm_info.shm_tot = ns->shm_tot; | |
1da177e4 LT |
631 | shm_info.swap_attempts = 0; |
632 | shm_info.swap_successes = 0; | |
4e982311 KK |
633 | err = shm_ids(ns).max_id; |
634 | mutex_unlock(&shm_ids(ns).mutex); | |
1da177e4 LT |
635 | if(copy_to_user (buf, &shm_info, sizeof(shm_info))) { |
636 | err = -EFAULT; | |
637 | goto out; | |
638 | } | |
639 | ||
640 | err = err < 0 ? 0 : err; | |
641 | goto out; | |
642 | } | |
643 | case SHM_STAT: | |
644 | case IPC_STAT: | |
645 | { | |
646 | struct shmid64_ds tbuf; | |
647 | int result; | |
648 | memset(&tbuf, 0, sizeof(tbuf)); | |
4e982311 | 649 | shp = shm_lock(ns, shmid); |
1da177e4 LT |
650 | if(shp==NULL) { |
651 | err = -EINVAL; | |
652 | goto out; | |
653 | } else if(cmd==SHM_STAT) { | |
654 | err = -EINVAL; | |
4e982311 | 655 | if (shmid > shm_ids(ns).max_id) |
1da177e4 | 656 | goto out_unlock; |
4e982311 | 657 | result = shm_buildid(ns, shmid, shp->shm_perm.seq); |
1da177e4 | 658 | } else { |
4e982311 | 659 | err = shm_checkid(ns, shp,shmid); |
1da177e4 LT |
660 | if(err) |
661 | goto out_unlock; | |
662 | result = 0; | |
663 | } | |
664 | err=-EACCES; | |
665 | if (ipcperms (&shp->shm_perm, S_IRUGO)) | |
666 | goto out_unlock; | |
667 | err = security_shm_shmctl(shp, cmd); | |
668 | if (err) | |
669 | goto out_unlock; | |
670 | kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm); | |
671 | tbuf.shm_segsz = shp->shm_segsz; | |
672 | tbuf.shm_atime = shp->shm_atim; | |
673 | tbuf.shm_dtime = shp->shm_dtim; | |
674 | tbuf.shm_ctime = shp->shm_ctim; | |
675 | tbuf.shm_cpid = shp->shm_cprid; | |
676 | tbuf.shm_lpid = shp->shm_lprid; | |
bc56bba8 | 677 | tbuf.shm_nattch = shp->shm_nattch; |
1da177e4 LT |
678 | shm_unlock(shp); |
679 | if(copy_shmid_to_user (buf, &tbuf, version)) | |
680 | err = -EFAULT; | |
681 | else | |
682 | err = result; | |
683 | goto out; | |
684 | } | |
685 | case SHM_LOCK: | |
686 | case SHM_UNLOCK: | |
687 | { | |
4e982311 | 688 | shp = shm_lock(ns, shmid); |
1da177e4 LT |
689 | if(shp==NULL) { |
690 | err = -EINVAL; | |
691 | goto out; | |
692 | } | |
4e982311 | 693 | err = shm_checkid(ns, shp,shmid); |
1da177e4 LT |
694 | if(err) |
695 | goto out_unlock; | |
696 | ||
073115d6 SG |
697 | err = audit_ipc_obj(&(shp->shm_perm)); |
698 | if (err) | |
699 | goto out_unlock; | |
700 | ||
1da177e4 LT |
701 | if (!capable(CAP_IPC_LOCK)) { |
702 | err = -EPERM; | |
703 | if (current->euid != shp->shm_perm.uid && | |
704 | current->euid != shp->shm_perm.cuid) | |
705 | goto out_unlock; | |
706 | if (cmd == SHM_LOCK && | |
707 | !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur) | |
708 | goto out_unlock; | |
709 | } | |
710 | ||
711 | err = security_shm_shmctl(shp, cmd); | |
712 | if (err) | |
713 | goto out_unlock; | |
714 | ||
715 | if(cmd==SHM_LOCK) { | |
716 | struct user_struct * user = current->user; | |
717 | if (!is_file_hugepages(shp->shm_file)) { | |
718 | err = shmem_lock(shp->shm_file, 1, user); | |
7be77e20 | 719 | if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){ |
b33291c0 | 720 | shp->shm_perm.mode |= SHM_LOCKED; |
1da177e4 LT |
721 | shp->mlock_user = user; |
722 | } | |
723 | } | |
724 | } else if (!is_file_hugepages(shp->shm_file)) { | |
725 | shmem_lock(shp->shm_file, 0, shp->mlock_user); | |
b33291c0 | 726 | shp->shm_perm.mode &= ~SHM_LOCKED; |
1da177e4 LT |
727 | shp->mlock_user = NULL; |
728 | } | |
729 | shm_unlock(shp); | |
730 | goto out; | |
731 | } | |
732 | case IPC_RMID: | |
733 | { | |
734 | /* | |
735 | * We cannot simply remove the file. The SVID states | |
736 | * that the block remains until the last person | |
737 | * detaches from it, then is deleted. A shmat() on | |
738 | * an RMID segment is legal in older Linux and if | |
739 | * we change it apps break... | |
740 | * | |
741 | * Instead we set a destroyed flag, and then blow | |
742 | * the name away when the usage hits zero. | |
743 | */ | |
4e982311 KK |
744 | mutex_lock(&shm_ids(ns).mutex); |
745 | shp = shm_lock(ns, shmid); | |
1da177e4 LT |
746 | err = -EINVAL; |
747 | if (shp == NULL) | |
748 | goto out_up; | |
4e982311 | 749 | err = shm_checkid(ns, shp, shmid); |
1da177e4 LT |
750 | if(err) |
751 | goto out_unlock_up; | |
752 | ||
073115d6 SG |
753 | err = audit_ipc_obj(&(shp->shm_perm)); |
754 | if (err) | |
755 | goto out_unlock_up; | |
756 | ||
1da177e4 LT |
757 | if (current->euid != shp->shm_perm.uid && |
758 | current->euid != shp->shm_perm.cuid && | |
759 | !capable(CAP_SYS_ADMIN)) { | |
760 | err=-EPERM; | |
761 | goto out_unlock_up; | |
762 | } | |
763 | ||
764 | err = security_shm_shmctl(shp, cmd); | |
765 | if (err) | |
766 | goto out_unlock_up; | |
767 | ||
4e982311 KK |
768 | do_shm_rmid(ns, shp); |
769 | mutex_unlock(&shm_ids(ns).mutex); | |
1da177e4 LT |
770 | goto out; |
771 | } | |
772 | ||
773 | case IPC_SET: | |
774 | { | |
775 | if (copy_shmid_from_user (&setbuf, buf, version)) { | |
776 | err = -EFAULT; | |
777 | goto out; | |
778 | } | |
4e982311 KK |
779 | mutex_lock(&shm_ids(ns).mutex); |
780 | shp = shm_lock(ns, shmid); | |
1da177e4 LT |
781 | err=-EINVAL; |
782 | if(shp==NULL) | |
783 | goto out_up; | |
4e982311 | 784 | err = shm_checkid(ns, shp,shmid); |
1da177e4 LT |
785 | if(err) |
786 | goto out_unlock_up; | |
073115d6 SG |
787 | err = audit_ipc_obj(&(shp->shm_perm)); |
788 | if (err) | |
789 | goto out_unlock_up; | |
ac03221a | 790 | err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode); |
073115d6 SG |
791 | if (err) |
792 | goto out_unlock_up; | |
1da177e4 LT |
793 | err=-EPERM; |
794 | if (current->euid != shp->shm_perm.uid && | |
795 | current->euid != shp->shm_perm.cuid && | |
796 | !capable(CAP_SYS_ADMIN)) { | |
797 | goto out_unlock_up; | |
798 | } | |
799 | ||
800 | err = security_shm_shmctl(shp, cmd); | |
801 | if (err) | |
802 | goto out_unlock_up; | |
803 | ||
804 | shp->shm_perm.uid = setbuf.uid; | |
805 | shp->shm_perm.gid = setbuf.gid; | |
b33291c0 | 806 | shp->shm_perm.mode = (shp->shm_perm.mode & ~S_IRWXUGO) |
1da177e4 LT |
807 | | (setbuf.mode & S_IRWXUGO); |
808 | shp->shm_ctim = get_seconds(); | |
809 | break; | |
810 | } | |
811 | ||
812 | default: | |
813 | err = -EINVAL; | |
814 | goto out; | |
815 | } | |
816 | ||
817 | err = 0; | |
818 | out_unlock_up: | |
819 | shm_unlock(shp); | |
820 | out_up: | |
4e982311 | 821 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 LT |
822 | goto out; |
823 | out_unlock: | |
824 | shm_unlock(shp); | |
825 | out: | |
826 | return err; | |
827 | } | |
828 | ||
829 | /* | |
830 | * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. | |
831 | * | |
832 | * NOTE! Despite the name, this is NOT a direct system call entrypoint. The | |
833 | * "raddr" thing points to kernel space, and there has to be a wrapper around | |
834 | * this. | |
835 | */ | |
836 | long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr) | |
837 | { | |
838 | struct shmid_kernel *shp; | |
839 | unsigned long addr; | |
840 | unsigned long size; | |
841 | struct file * file; | |
842 | int err; | |
843 | unsigned long flags; | |
844 | unsigned long prot; | |
1da177e4 | 845 | int acc_mode; |
bc56bba8 | 846 | unsigned long user_addr; |
4e982311 | 847 | struct ipc_namespace *ns; |
bc56bba8 EB |
848 | struct shm_file_data *sfd; |
849 | struct path path; | |
850 | mode_t f_mode; | |
1da177e4 | 851 | |
bc56bba8 EB |
852 | err = -EINVAL; |
853 | if (shmid < 0) | |
1da177e4 | 854 | goto out; |
bc56bba8 | 855 | else if ((addr = (ulong)shmaddr)) { |
1da177e4 LT |
856 | if (addr & (SHMLBA-1)) { |
857 | if (shmflg & SHM_RND) | |
858 | addr &= ~(SHMLBA-1); /* round down */ | |
859 | else | |
860 | #ifndef __ARCH_FORCE_SHMLBA | |
861 | if (addr & ~PAGE_MASK) | |
862 | #endif | |
bc56bba8 | 863 | goto out; |
1da177e4 LT |
864 | } |
865 | flags = MAP_SHARED | MAP_FIXED; | |
866 | } else { | |
867 | if ((shmflg & SHM_REMAP)) | |
bc56bba8 | 868 | goto out; |
1da177e4 LT |
869 | |
870 | flags = MAP_SHARED; | |
871 | } | |
872 | ||
873 | if (shmflg & SHM_RDONLY) { | |
874 | prot = PROT_READ; | |
1da177e4 | 875 | acc_mode = S_IRUGO; |
bc56bba8 | 876 | f_mode = FMODE_READ; |
1da177e4 LT |
877 | } else { |
878 | prot = PROT_READ | PROT_WRITE; | |
1da177e4 | 879 | acc_mode = S_IRUGO | S_IWUGO; |
bc56bba8 | 880 | f_mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
881 | } |
882 | if (shmflg & SHM_EXEC) { | |
883 | prot |= PROT_EXEC; | |
884 | acc_mode |= S_IXUGO; | |
885 | } | |
886 | ||
887 | /* | |
888 | * We cannot rely on the fs check since SYSV IPC does have an | |
889 | * additional creator id... | |
890 | */ | |
4e982311 KK |
891 | ns = current->nsproxy->ipc_ns; |
892 | shp = shm_lock(ns, shmid); | |
bc56bba8 | 893 | if(shp == NULL) |
1da177e4 | 894 | goto out; |
bc56bba8 | 895 | |
4e982311 | 896 | err = shm_checkid(ns, shp,shmid); |
bc56bba8 EB |
897 | if (err) |
898 | goto out_unlock; | |
899 | ||
900 | err = -EACCES; | |
901 | if (ipcperms(&shp->shm_perm, acc_mode)) | |
902 | goto out_unlock; | |
1da177e4 LT |
903 | |
904 | err = security_shm_shmat(shp, shmaddr, shmflg); | |
bc56bba8 EB |
905 | if (err) |
906 | goto out_unlock; | |
907 | ||
908 | path.dentry = dget(shp->shm_file->f_path.dentry); | |
909 | path.mnt = mntget(shp->shm_file->f_path.mnt); | |
1da177e4 | 910 | shp->shm_nattch++; |
bc56bba8 | 911 | size = i_size_read(path.dentry->d_inode); |
1da177e4 LT |
912 | shm_unlock(shp); |
913 | ||
bc56bba8 EB |
914 | err = -ENOMEM; |
915 | sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); | |
916 | if (!sfd) | |
917 | goto out_put_path; | |
918 | ||
919 | err = -ENOMEM; | |
920 | file = get_empty_filp(); | |
921 | if (!file) | |
922 | goto out_free; | |
923 | ||
924 | file->f_op = &shm_file_operations; | |
925 | file->private_data = sfd; | |
926 | file->f_path = path; | |
927 | file->f_mapping = shp->shm_file->f_mapping; | |
928 | file->f_mode = f_mode; | |
929 | sfd->id = shp->id; | |
930 | sfd->ns = get_ipc_ns(ns); | |
931 | sfd->file = shp->shm_file; | |
932 | sfd->vm_ops = NULL; | |
933 | ||
1da177e4 LT |
934 | down_write(¤t->mm->mmap_sem); |
935 | if (addr && !(shmflg & SHM_REMAP)) { | |
bc56bba8 | 936 | err = -EINVAL; |
1da177e4 LT |
937 | if (find_vma_intersection(current->mm, addr, addr + size)) |
938 | goto invalid; | |
939 | /* | |
940 | * If shm segment goes below stack, make sure there is some | |
941 | * space left for the stack to grow (at least 4 pages). | |
942 | */ | |
943 | if (addr < current->mm->start_stack && | |
944 | addr > current->mm->start_stack - size - PAGE_SIZE * 5) | |
945 | goto invalid; | |
946 | } | |
947 | ||
bc56bba8 EB |
948 | user_addr = do_mmap (file, addr, size, prot, flags, 0); |
949 | *raddr = user_addr; | |
950 | err = 0; | |
951 | if (IS_ERR_VALUE(user_addr)) | |
952 | err = (long)user_addr; | |
1da177e4 LT |
953 | invalid: |
954 | up_write(¤t->mm->mmap_sem); | |
955 | ||
bc56bba8 EB |
956 | fput(file); |
957 | ||
958 | out_nattch: | |
4e982311 KK |
959 | mutex_lock(&shm_ids(ns).mutex); |
960 | shp = shm_lock(ns, shmid); | |
9ba025f1 | 961 | BUG_ON(!shp); |
1da177e4 LT |
962 | shp->shm_nattch--; |
963 | if(shp->shm_nattch == 0 && | |
b33291c0 | 964 | shp->shm_perm.mode & SHM_DEST) |
4e982311 | 965 | shm_destroy(ns, shp); |
1da177e4 LT |
966 | else |
967 | shm_unlock(shp); | |
4e982311 | 968 | mutex_unlock(&shm_ids(ns).mutex); |
1da177e4 | 969 | |
1da177e4 LT |
970 | out: |
971 | return err; | |
bc56bba8 EB |
972 | |
973 | out_unlock: | |
974 | shm_unlock(shp); | |
975 | goto out; | |
976 | ||
977 | out_free: | |
978 | kfree(sfd); | |
979 | out_put_path: | |
980 | dput(path.dentry); | |
981 | mntput(path.mnt); | |
982 | goto out_nattch; | |
1da177e4 LT |
983 | } |
984 | ||
7d87e14c SR |
985 | asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) |
986 | { | |
987 | unsigned long ret; | |
988 | long err; | |
989 | ||
990 | err = do_shmat(shmid, shmaddr, shmflg, &ret); | |
991 | if (err) | |
992 | return err; | |
993 | force_successful_syscall_return(); | |
994 | return (long)ret; | |
995 | } | |
996 | ||
1da177e4 LT |
997 | /* |
998 | * detach and kill segment if marked destroyed. | |
999 | * The work is done in shm_close. | |
1000 | */ | |
1001 | asmlinkage long sys_shmdt(char __user *shmaddr) | |
1002 | { | |
1003 | struct mm_struct *mm = current->mm; | |
1004 | struct vm_area_struct *vma, *next; | |
1005 | unsigned long addr = (unsigned long)shmaddr; | |
1006 | loff_t size = 0; | |
1007 | int retval = -EINVAL; | |
1008 | ||
df1e2fb5 HD |
1009 | if (addr & ~PAGE_MASK) |
1010 | return retval; | |
1011 | ||
1da177e4 LT |
1012 | down_write(&mm->mmap_sem); |
1013 | ||
1014 | /* | |
1015 | * This function tries to be smart and unmap shm segments that | |
1016 | * were modified by partial mlock or munmap calls: | |
1017 | * - It first determines the size of the shm segment that should be | |
1018 | * unmapped: It searches for a vma that is backed by shm and that | |
1019 | * started at address shmaddr. It records it's size and then unmaps | |
1020 | * it. | |
1021 | * - Then it unmaps all shm vmas that started at shmaddr and that | |
1022 | * are within the initially determined size. | |
1023 | * Errors from do_munmap are ignored: the function only fails if | |
1024 | * it's called with invalid parameters or if it's called to unmap | |
1025 | * a part of a vma. Both calls in this function are for full vmas, | |
1026 | * the parameters are directly copied from the vma itself and always | |
1027 | * valid - therefore do_munmap cannot fail. (famous last words?) | |
1028 | */ | |
1029 | /* | |
1030 | * If it had been mremap()'d, the starting address would not | |
1031 | * match the usual checks anyway. So assume all vma's are | |
1032 | * above the starting address given. | |
1033 | */ | |
1034 | vma = find_vma(mm, addr); | |
1035 | ||
1036 | while (vma) { | |
1037 | next = vma->vm_next; | |
1038 | ||
1039 | /* | |
1040 | * Check if the starting address would match, i.e. it's | |
1041 | * a fragment created by mprotect() and/or munmap(), or it | |
1042 | * otherwise it starts at this address with no hassles. | |
1043 | */ | |
bc56bba8 | 1044 | if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4 LT |
1045 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
1046 | ||
1047 | ||
6d63079a | 1048 | size = vma->vm_file->f_path.dentry->d_inode->i_size; |
1da177e4 LT |
1049 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); |
1050 | /* | |
1051 | * We discovered the size of the shm segment, so | |
1052 | * break out of here and fall through to the next | |
1053 | * loop that uses the size information to stop | |
1054 | * searching for matching vma's. | |
1055 | */ | |
1056 | retval = 0; | |
1057 | vma = next; | |
1058 | break; | |
1059 | } | |
1060 | vma = next; | |
1061 | } | |
1062 | ||
1063 | /* | |
1064 | * We need look no further than the maximum address a fragment | |
1065 | * could possibly have landed at. Also cast things to loff_t to | |
1066 | * prevent overflows and make comparisions vs. equal-width types. | |
1067 | */ | |
8e36709d | 1068 | size = PAGE_ALIGN(size); |
1da177e4 LT |
1069 | while (vma && (loff_t)(vma->vm_end - addr) <= size) { |
1070 | next = vma->vm_next; | |
1071 | ||
1072 | /* finding a matching vma now does not alter retval */ | |
bc56bba8 | 1073 | if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4 LT |
1074 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) |
1075 | ||
1076 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); | |
1077 | vma = next; | |
1078 | } | |
1079 | ||
1080 | up_write(&mm->mmap_sem); | |
1081 | return retval; | |
1082 | } | |
1083 | ||
1084 | #ifdef CONFIG_PROC_FS | |
19b4946c | 1085 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1da177e4 | 1086 | { |
19b4946c MW |
1087 | struct shmid_kernel *shp = it; |
1088 | char *format; | |
1da177e4 | 1089 | |
1da177e4 LT |
1090 | #define SMALL_STRING "%10d %10d %4o %10u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n" |
1091 | #define BIG_STRING "%10d %10d %4o %21u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu\n" | |
1da177e4 | 1092 | |
19b4946c MW |
1093 | if (sizeof(size_t) <= sizeof(int)) |
1094 | format = SMALL_STRING; | |
1095 | else | |
1096 | format = BIG_STRING; | |
1097 | return seq_printf(s, format, | |
1098 | shp->shm_perm.key, | |
1099 | shp->id, | |
b33291c0 | 1100 | shp->shm_perm.mode, |
19b4946c MW |
1101 | shp->shm_segsz, |
1102 | shp->shm_cprid, | |
1103 | shp->shm_lprid, | |
bc56bba8 | 1104 | shp->shm_nattch, |
19b4946c MW |
1105 | shp->shm_perm.uid, |
1106 | shp->shm_perm.gid, | |
1107 | shp->shm_perm.cuid, | |
1108 | shp->shm_perm.cgid, | |
1109 | shp->shm_atim, | |
1110 | shp->shm_dtim, | |
1111 | shp->shm_ctim); | |
1da177e4 LT |
1112 | } |
1113 | #endif |