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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> |
3e148c79 | 38 | #include <linux/rwsem.h> |
4e982311 | 39 | #include <linux/nsproxy.h> |
bc56bba8 | 40 | #include <linux/mount.h> |
ae5e1b22 | 41 | #include <linux/ipc_namespace.h> |
7d87e14c | 42 | |
1da177e4 LT |
43 | #include <asm/uaccess.h> |
44 | ||
45 | #include "util.h" | |
46 | ||
bc56bba8 EB |
47 | struct shm_file_data { |
48 | int id; | |
49 | struct ipc_namespace *ns; | |
50 | struct file *file; | |
51 | const struct vm_operations_struct *vm_ops; | |
52 | }; | |
53 | ||
54 | #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data)) | |
55 | ||
9a32144e | 56 | static const struct file_operations shm_file_operations; |
1da177e4 LT |
57 | static struct vm_operations_struct shm_vm_ops; |
58 | ||
ed2ddbf8 | 59 | #define shm_ids(ns) ((ns)->ids[IPC_SHM_IDS]) |
1da177e4 | 60 | |
4e982311 KK |
61 | #define shm_unlock(shp) \ |
62 | ipc_unlock(&(shp)->shm_perm) | |
1da177e4 | 63 | |
7748dbfa | 64 | static int newseg(struct ipc_namespace *, struct ipc_params *); |
bc56bba8 EB |
65 | static void shm_open(struct vm_area_struct *vma); |
66 | static void shm_close(struct vm_area_struct *vma); | |
4e982311 | 67 | static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp); |
1da177e4 | 68 | #ifdef CONFIG_PROC_FS |
19b4946c | 69 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it); |
1da177e4 LT |
70 | #endif |
71 | ||
ed2ddbf8 | 72 | void shm_init_ns(struct ipc_namespace *ns) |
4e982311 | 73 | { |
4e982311 KK |
74 | ns->shm_ctlmax = SHMMAX; |
75 | ns->shm_ctlall = SHMALL; | |
76 | ns->shm_ctlmni = SHMMNI; | |
77 | ns->shm_tot = 0; | |
ed2ddbf8 | 78 | ipc_init_ids(&ns->ids[IPC_SHM_IDS]); |
4e982311 KK |
79 | } |
80 | ||
f4566f04 | 81 | /* |
3e148c79 ND |
82 | * Called with shm_ids.rw_mutex (writer) and the shp structure locked. |
83 | * Only shm_ids.rw_mutex remains locked on exit. | |
f4566f04 | 84 | */ |
01b8b07a | 85 | static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) |
4e982311 | 86 | { |
01b8b07a PP |
87 | struct shmid_kernel *shp; |
88 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); | |
89 | ||
4e982311 KK |
90 | if (shp->shm_nattch){ |
91 | shp->shm_perm.mode |= SHM_DEST; | |
92 | /* Do not find it any more */ | |
93 | shp->shm_perm.key = IPC_PRIVATE; | |
94 | shm_unlock(shp); | |
95 | } else | |
96 | shm_destroy(ns, shp); | |
97 | } | |
98 | ||
ae5e1b22 | 99 | #ifdef CONFIG_IPC_NS |
4e982311 KK |
100 | void shm_exit_ns(struct ipc_namespace *ns) |
101 | { | |
01b8b07a | 102 | free_ipcs(ns, &shm_ids(ns), do_shm_rmid); |
4e982311 | 103 | } |
ae5e1b22 | 104 | #endif |
1da177e4 LT |
105 | |
106 | void __init shm_init (void) | |
107 | { | |
ed2ddbf8 | 108 | shm_init_ns(&init_ipc_ns); |
19b4946c MW |
109 | ipc_init_proc_interface("sysvipc/shm", |
110 | " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime\n", | |
4e982311 | 111 | IPC_SHM_IDS, sysvipc_shm_proc_show); |
1da177e4 LT |
112 | } |
113 | ||
3e148c79 ND |
114 | /* |
115 | * shm_lock_(check_)down routines are called in the paths where the rw_mutex | |
116 | * is held to protect access to the idr tree. | |
117 | */ | |
118 | static inline struct shmid_kernel *shm_lock_down(struct ipc_namespace *ns, | |
119 | int id) | |
120 | { | |
121 | struct kern_ipc_perm *ipcp = ipc_lock_down(&shm_ids(ns), id); | |
122 | ||
b1ed88b4 PP |
123 | if (IS_ERR(ipcp)) |
124 | return (struct shmid_kernel *)ipcp; | |
125 | ||
3e148c79 ND |
126 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
127 | } | |
128 | ||
3e148c79 ND |
129 | /* |
130 | * shm_lock_(check_) routines are called in the paths where the rw_mutex | |
131 | * is not held. | |
132 | */ | |
023a5355 | 133 | static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id) |
1da177e4 | 134 | { |
03f02c76 ND |
135 | struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id); |
136 | ||
b1ed88b4 PP |
137 | if (IS_ERR(ipcp)) |
138 | return (struct shmid_kernel *)ipcp; | |
139 | ||
03f02c76 | 140 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
023a5355 ND |
141 | } |
142 | ||
143 | static inline struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns, | |
144 | int id) | |
145 | { | |
03f02c76 ND |
146 | struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id); |
147 | ||
b1ed88b4 PP |
148 | if (IS_ERR(ipcp)) |
149 | return (struct shmid_kernel *)ipcp; | |
150 | ||
03f02c76 | 151 | return container_of(ipcp, struct shmid_kernel, shm_perm); |
1da177e4 LT |
152 | } |
153 | ||
7ca7e564 | 154 | static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s) |
1da177e4 | 155 | { |
7ca7e564 | 156 | ipc_rmid(&shm_ids(ns), &s->shm_perm); |
1da177e4 LT |
157 | } |
158 | ||
1da177e4 | 159 | |
bc56bba8 EB |
160 | /* This is called by fork, once for every shm attach. */ |
161 | static void shm_open(struct vm_area_struct *vma) | |
4e982311 | 162 | { |
bc56bba8 EB |
163 | struct file *file = vma->vm_file; |
164 | struct shm_file_data *sfd = shm_file_data(file); | |
1da177e4 LT |
165 | struct shmid_kernel *shp; |
166 | ||
bc56bba8 | 167 | shp = shm_lock(sfd->ns, sfd->id); |
023a5355 | 168 | BUG_ON(IS_ERR(shp)); |
1da177e4 | 169 | shp->shm_atim = get_seconds(); |
b488893a | 170 | shp->shm_lprid = task_tgid_vnr(current); |
1da177e4 LT |
171 | shp->shm_nattch++; |
172 | shm_unlock(shp); | |
173 | } | |
174 | ||
1da177e4 LT |
175 | /* |
176 | * shm_destroy - free the struct shmid_kernel | |
177 | * | |
f4566f04 | 178 | * @ns: namespace |
1da177e4 LT |
179 | * @shp: struct to free |
180 | * | |
3e148c79 | 181 | * It has to be called with shp and shm_ids.rw_mutex (writer) 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 | 186 | ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
7ca7e564 | 187 | shm_rmid(ns, shp); |
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 | 211 | |
3e148c79 | 212 | down_write(&shm_ids(ns).rw_mutex); |
1da177e4 | 213 | /* remove from the list of attaches of the shm segment */ |
3e148c79 | 214 | shp = shm_lock_down(ns, sfd->id); |
023a5355 | 215 | BUG_ON(IS_ERR(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); | |
3e148c79 | 224 | up_write(&shm_ids(ns).rw_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); | |
52cd3b07 | 255 | else if (vma->vm_policy) |
bc56bba8 | 256 | pol = vma->vm_policy; |
52cd3b07 | 257 | |
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 | ||
f4566f04 ND |
339 | /** |
340 | * newseg - Create a new shared memory segment | |
341 | * @ns: namespace | |
342 | * @params: ptr to the structure that contains key, size and shmflg | |
343 | * | |
3e148c79 | 344 | * Called with shm_ids.rw_mutex held as a writer. |
f4566f04 ND |
345 | */ |
346 | ||
7748dbfa | 347 | static int newseg(struct ipc_namespace *ns, struct ipc_params *params) |
1da177e4 | 348 | { |
7748dbfa ND |
349 | key_t key = params->key; |
350 | int shmflg = params->flg; | |
351 | size_t size = params->u.size; | |
1da177e4 LT |
352 | int error; |
353 | struct shmid_kernel *shp; | |
354 | int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
355 | struct file * file; | |
356 | char name[13]; | |
357 | int id; | |
358 | ||
4e982311 | 359 | if (size < SHMMIN || size > ns->shm_ctlmax) |
1da177e4 LT |
360 | return -EINVAL; |
361 | ||
f66d45e9 | 362 | if (ns->shm_tot + numpages > ns->shm_ctlall) |
1da177e4 LT |
363 | return -ENOSPC; |
364 | ||
365 | shp = ipc_rcu_alloc(sizeof(*shp)); | |
366 | if (!shp) | |
367 | return -ENOMEM; | |
368 | ||
369 | shp->shm_perm.key = key; | |
b33291c0 | 370 | shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
1da177e4 LT |
371 | shp->mlock_user = NULL; |
372 | ||
373 | shp->shm_perm.security = NULL; | |
374 | error = security_shm_alloc(shp); | |
375 | if (error) { | |
376 | ipc_rcu_putref(shp); | |
377 | return error; | |
378 | } | |
379 | ||
9d66586f | 380 | sprintf (name, "SYSV%08x", key); |
1da177e4 | 381 | if (shmflg & SHM_HUGETLB) { |
9d66586f EB |
382 | /* hugetlb_file_setup takes care of mlock user accounting */ |
383 | file = hugetlb_file_setup(name, size); | |
1da177e4 LT |
384 | shp->mlock_user = current->user; |
385 | } else { | |
bf8f972d BP |
386 | int acctflag = VM_ACCOUNT; |
387 | /* | |
388 | * Do not allow no accounting for OVERCOMMIT_NEVER, even | |
389 | * if it's asked for. | |
390 | */ | |
391 | if ((shmflg & SHM_NORESERVE) && | |
392 | sysctl_overcommit_memory != OVERCOMMIT_NEVER) | |
393 | acctflag = 0; | |
bf8f972d | 394 | file = shmem_file_setup(name, size, acctflag); |
1da177e4 LT |
395 | } |
396 | error = PTR_ERR(file); | |
397 | if (IS_ERR(file)) | |
398 | goto no_file; | |
399 | ||
48dea404 | 400 | id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); |
283bb7fa PP |
401 | if (id < 0) { |
402 | error = id; | |
1da177e4 | 403 | goto no_id; |
283bb7fa | 404 | } |
1da177e4 | 405 | |
b488893a | 406 | shp->shm_cprid = task_tgid_vnr(current); |
1da177e4 LT |
407 | shp->shm_lprid = 0; |
408 | shp->shm_atim = shp->shm_dtim = 0; | |
409 | shp->shm_ctim = get_seconds(); | |
410 | shp->shm_segsz = size; | |
411 | shp->shm_nattch = 0; | |
1da177e4 | 412 | shp->shm_file = file; |
30475cc1 BP |
413 | /* |
414 | * shmid gets reported as "inode#" in /proc/pid/maps. | |
415 | * proc-ps tools use this. Changing this will break them. | |
416 | */ | |
7ca7e564 | 417 | file->f_dentry->d_inode->i_ino = shp->shm_perm.id; |
551110a9 | 418 | |
4e982311 | 419 | ns->shm_tot += numpages; |
7ca7e564 | 420 | error = shp->shm_perm.id; |
1da177e4 | 421 | shm_unlock(shp); |
7ca7e564 | 422 | return error; |
1da177e4 LT |
423 | |
424 | no_id: | |
425 | fput(file); | |
426 | no_file: | |
427 | security_shm_free(shp); | |
428 | ipc_rcu_putref(shp); | |
429 | return error; | |
430 | } | |
431 | ||
f4566f04 | 432 | /* |
3e148c79 | 433 | * Called with shm_ids.rw_mutex and ipcp locked. |
f4566f04 | 434 | */ |
03f02c76 | 435 | static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg) |
7748dbfa | 436 | { |
03f02c76 ND |
437 | struct shmid_kernel *shp; |
438 | ||
439 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); | |
440 | return security_shm_associate(shp, shmflg); | |
7748dbfa ND |
441 | } |
442 | ||
f4566f04 | 443 | /* |
3e148c79 | 444 | * Called with shm_ids.rw_mutex and ipcp locked. |
f4566f04 | 445 | */ |
03f02c76 ND |
446 | static inline int shm_more_checks(struct kern_ipc_perm *ipcp, |
447 | struct ipc_params *params) | |
7748dbfa | 448 | { |
03f02c76 ND |
449 | struct shmid_kernel *shp; |
450 | ||
451 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); | |
452 | if (shp->shm_segsz < params->u.size) | |
7748dbfa ND |
453 | return -EINVAL; |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
1da177e4 LT |
458 | asmlinkage long sys_shmget (key_t key, size_t size, int shmflg) |
459 | { | |
4e982311 | 460 | struct ipc_namespace *ns; |
7748dbfa ND |
461 | struct ipc_ops shm_ops; |
462 | struct ipc_params shm_params; | |
4e982311 KK |
463 | |
464 | ns = current->nsproxy->ipc_ns; | |
1da177e4 | 465 | |
7748dbfa ND |
466 | shm_ops.getnew = newseg; |
467 | shm_ops.associate = shm_security; | |
468 | shm_ops.more_checks = shm_more_checks; | |
7ca7e564 | 469 | |
7748dbfa ND |
470 | shm_params.key = key; |
471 | shm_params.flg = shmflg; | |
472 | shm_params.u.size = size; | |
1da177e4 | 473 | |
7748dbfa | 474 | return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params); |
1da177e4 LT |
475 | } |
476 | ||
477 | static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) | |
478 | { | |
479 | switch(version) { | |
480 | case IPC_64: | |
481 | return copy_to_user(buf, in, sizeof(*in)); | |
482 | case IPC_OLD: | |
483 | { | |
484 | struct shmid_ds out; | |
485 | ||
486 | ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); | |
487 | out.shm_segsz = in->shm_segsz; | |
488 | out.shm_atime = in->shm_atime; | |
489 | out.shm_dtime = in->shm_dtime; | |
490 | out.shm_ctime = in->shm_ctime; | |
491 | out.shm_cpid = in->shm_cpid; | |
492 | out.shm_lpid = in->shm_lpid; | |
493 | out.shm_nattch = in->shm_nattch; | |
494 | ||
495 | return copy_to_user(buf, &out, sizeof(out)); | |
496 | } | |
497 | default: | |
498 | return -EINVAL; | |
499 | } | |
500 | } | |
501 | ||
016d7132 PP |
502 | static inline unsigned long |
503 | copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version) | |
1da177e4 LT |
504 | { |
505 | switch(version) { | |
506 | case IPC_64: | |
016d7132 | 507 | if (copy_from_user(out, buf, sizeof(*out))) |
1da177e4 | 508 | return -EFAULT; |
1da177e4 | 509 | return 0; |
1da177e4 LT |
510 | case IPC_OLD: |
511 | { | |
512 | struct shmid_ds tbuf_old; | |
513 | ||
514 | if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) | |
515 | return -EFAULT; | |
516 | ||
016d7132 PP |
517 | out->shm_perm.uid = tbuf_old.shm_perm.uid; |
518 | out->shm_perm.gid = tbuf_old.shm_perm.gid; | |
519 | out->shm_perm.mode = tbuf_old.shm_perm.mode; | |
1da177e4 LT |
520 | |
521 | return 0; | |
522 | } | |
523 | default: | |
524 | return -EINVAL; | |
525 | } | |
526 | } | |
527 | ||
528 | static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) | |
529 | { | |
530 | switch(version) { | |
531 | case IPC_64: | |
532 | return copy_to_user(buf, in, sizeof(*in)); | |
533 | case IPC_OLD: | |
534 | { | |
535 | struct shminfo out; | |
536 | ||
537 | if(in->shmmax > INT_MAX) | |
538 | out.shmmax = INT_MAX; | |
539 | else | |
540 | out.shmmax = (int)in->shmmax; | |
541 | ||
542 | out.shmmin = in->shmmin; | |
543 | out.shmmni = in->shmmni; | |
544 | out.shmseg = in->shmseg; | |
545 | out.shmall = in->shmall; | |
546 | ||
547 | return copy_to_user(buf, &out, sizeof(out)); | |
548 | } | |
549 | default: | |
550 | return -EINVAL; | |
551 | } | |
552 | } | |
553 | ||
f4566f04 | 554 | /* |
3e148c79 | 555 | * Called with shm_ids.rw_mutex held as a reader |
f4566f04 | 556 | */ |
4e982311 KK |
557 | static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, |
558 | unsigned long *swp) | |
1da177e4 | 559 | { |
7ca7e564 ND |
560 | int next_id; |
561 | int total, in_use; | |
1da177e4 LT |
562 | |
563 | *rss = 0; | |
564 | *swp = 0; | |
565 | ||
7ca7e564 ND |
566 | in_use = shm_ids(ns).in_use; |
567 | ||
568 | for (total = 0, next_id = 0; total < in_use; next_id++) { | |
1da177e4 LT |
569 | struct shmid_kernel *shp; |
570 | struct inode *inode; | |
571 | ||
637c3663 | 572 | shp = idr_find(&shm_ids(ns).ipcs_idr, next_id); |
7ca7e564 | 573 | if (shp == NULL) |
1da177e4 LT |
574 | continue; |
575 | ||
6d63079a | 576 | inode = shp->shm_file->f_path.dentry->d_inode; |
1da177e4 LT |
577 | |
578 | if (is_file_hugepages(shp->shm_file)) { | |
579 | struct address_space *mapping = inode->i_mapping; | |
a5516438 AK |
580 | struct hstate *h = hstate_file(shp->shm_file); |
581 | *rss += pages_per_huge_page(h) * mapping->nrpages; | |
1da177e4 LT |
582 | } else { |
583 | struct shmem_inode_info *info = SHMEM_I(inode); | |
584 | spin_lock(&info->lock); | |
585 | *rss += inode->i_mapping->nrpages; | |
586 | *swp += info->swapped; | |
587 | spin_unlock(&info->lock); | |
588 | } | |
7ca7e564 ND |
589 | |
590 | total++; | |
1da177e4 LT |
591 | } |
592 | } | |
593 | ||
8d4cc8b5 PP |
594 | /* |
595 | * This function handles some shmctl commands which require the rw_mutex | |
596 | * to be held in write mode. | |
597 | * NOTE: no locks must be held, the rw_mutex is taken inside this function. | |
598 | */ | |
599 | static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd, | |
600 | struct shmid_ds __user *buf, int version) | |
1da177e4 | 601 | { |
8d4cc8b5 | 602 | struct kern_ipc_perm *ipcp; |
016d7132 | 603 | struct shmid64_ds shmid64; |
8d4cc8b5 PP |
604 | struct shmid_kernel *shp; |
605 | int err; | |
606 | ||
607 | if (cmd == IPC_SET) { | |
016d7132 | 608 | if (copy_shmid_from_user(&shmid64, buf, version)) |
8d4cc8b5 PP |
609 | return -EFAULT; |
610 | } | |
611 | ||
a5f75e7f PP |
612 | ipcp = ipcctl_pre_down(&shm_ids(ns), shmid, cmd, &shmid64.shm_perm, 0); |
613 | if (IS_ERR(ipcp)) | |
614 | return PTR_ERR(ipcp); | |
8d4cc8b5 | 615 | |
a5f75e7f | 616 | shp = container_of(ipcp, struct shmid_kernel, shm_perm); |
8d4cc8b5 PP |
617 | |
618 | err = security_shm_shmctl(shp, cmd); | |
619 | if (err) | |
620 | goto out_unlock; | |
621 | switch (cmd) { | |
622 | case IPC_RMID: | |
623 | do_shm_rmid(ns, ipcp); | |
624 | goto out_up; | |
625 | case IPC_SET: | |
8f4a3809 | 626 | ipc_update_perm(&shmid64.shm_perm, ipcp); |
8d4cc8b5 PP |
627 | shp->shm_ctim = get_seconds(); |
628 | break; | |
629 | default: | |
630 | err = -EINVAL; | |
631 | } | |
632 | out_unlock: | |
633 | shm_unlock(shp); | |
634 | out_up: | |
635 | up_write(&shm_ids(ns).rw_mutex); | |
636 | return err; | |
637 | } | |
638 | ||
639 | asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf) | |
640 | { | |
1da177e4 LT |
641 | struct shmid_kernel *shp; |
642 | int err, version; | |
4e982311 | 643 | struct ipc_namespace *ns; |
1da177e4 LT |
644 | |
645 | if (cmd < 0 || shmid < 0) { | |
646 | err = -EINVAL; | |
647 | goto out; | |
648 | } | |
649 | ||
650 | version = ipc_parse_version(&cmd); | |
4e982311 | 651 | ns = current->nsproxy->ipc_ns; |
1da177e4 LT |
652 | |
653 | switch (cmd) { /* replace with proc interface ? */ | |
654 | case IPC_INFO: | |
655 | { | |
656 | struct shminfo64 shminfo; | |
657 | ||
658 | err = security_shm_shmctl(NULL, cmd); | |
659 | if (err) | |
660 | return err; | |
661 | ||
662 | memset(&shminfo,0,sizeof(shminfo)); | |
4e982311 KK |
663 | shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; |
664 | shminfo.shmmax = ns->shm_ctlmax; | |
665 | shminfo.shmall = ns->shm_ctlall; | |
1da177e4 LT |
666 | |
667 | shminfo.shmmin = SHMMIN; | |
668 | if(copy_shminfo_to_user (buf, &shminfo, version)) | |
669 | return -EFAULT; | |
f4566f04 | 670 | |
3e148c79 | 671 | down_read(&shm_ids(ns).rw_mutex); |
7ca7e564 | 672 | err = ipc_get_maxid(&shm_ids(ns)); |
3e148c79 | 673 | up_read(&shm_ids(ns).rw_mutex); |
f4566f04 | 674 | |
1da177e4 LT |
675 | if(err<0) |
676 | err = 0; | |
677 | goto out; | |
678 | } | |
679 | case SHM_INFO: | |
680 | { | |
681 | struct shm_info shm_info; | |
682 | ||
683 | err = security_shm_shmctl(NULL, cmd); | |
684 | if (err) | |
685 | return err; | |
686 | ||
687 | memset(&shm_info,0,sizeof(shm_info)); | |
3e148c79 | 688 | down_read(&shm_ids(ns).rw_mutex); |
4e982311 KK |
689 | shm_info.used_ids = shm_ids(ns).in_use; |
690 | shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp); | |
691 | shm_info.shm_tot = ns->shm_tot; | |
1da177e4 LT |
692 | shm_info.swap_attempts = 0; |
693 | shm_info.swap_successes = 0; | |
7ca7e564 | 694 | err = ipc_get_maxid(&shm_ids(ns)); |
3e148c79 | 695 | up_read(&shm_ids(ns).rw_mutex); |
1da177e4 LT |
696 | if(copy_to_user (buf, &shm_info, sizeof(shm_info))) { |
697 | err = -EFAULT; | |
698 | goto out; | |
699 | } | |
700 | ||
701 | err = err < 0 ? 0 : err; | |
702 | goto out; | |
703 | } | |
704 | case SHM_STAT: | |
705 | case IPC_STAT: | |
706 | { | |
707 | struct shmid64_ds tbuf; | |
708 | int result; | |
023a5355 ND |
709 | |
710 | if (!buf) { | |
711 | err = -EFAULT; | |
1da177e4 | 712 | goto out; |
023a5355 ND |
713 | } |
714 | ||
715 | if (cmd == SHM_STAT) { | |
716 | shp = shm_lock(ns, shmid); | |
717 | if (IS_ERR(shp)) { | |
718 | err = PTR_ERR(shp); | |
719 | goto out; | |
720 | } | |
7ca7e564 | 721 | result = shp->shm_perm.id; |
1da177e4 | 722 | } else { |
023a5355 ND |
723 | shp = shm_lock_check(ns, shmid); |
724 | if (IS_ERR(shp)) { | |
725 | err = PTR_ERR(shp); | |
726 | goto out; | |
727 | } | |
1da177e4 LT |
728 | result = 0; |
729 | } | |
730 | err=-EACCES; | |
731 | if (ipcperms (&shp->shm_perm, S_IRUGO)) | |
732 | goto out_unlock; | |
733 | err = security_shm_shmctl(shp, cmd); | |
734 | if (err) | |
735 | goto out_unlock; | |
023a5355 | 736 | memset(&tbuf, 0, sizeof(tbuf)); |
1da177e4 LT |
737 | kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm); |
738 | tbuf.shm_segsz = shp->shm_segsz; | |
739 | tbuf.shm_atime = shp->shm_atim; | |
740 | tbuf.shm_dtime = shp->shm_dtim; | |
741 | tbuf.shm_ctime = shp->shm_ctim; | |
742 | tbuf.shm_cpid = shp->shm_cprid; | |
743 | tbuf.shm_lpid = shp->shm_lprid; | |
bc56bba8 | 744 | tbuf.shm_nattch = shp->shm_nattch; |
1da177e4 LT |
745 | shm_unlock(shp); |
746 | if(copy_shmid_to_user (buf, &tbuf, version)) | |
747 | err = -EFAULT; | |
748 | else | |
749 | err = result; | |
750 | goto out; | |
751 | } | |
752 | case SHM_LOCK: | |
753 | case SHM_UNLOCK: | |
754 | { | |
023a5355 ND |
755 | shp = shm_lock_check(ns, shmid); |
756 | if (IS_ERR(shp)) { | |
757 | err = PTR_ERR(shp); | |
1da177e4 LT |
758 | goto out; |
759 | } | |
1da177e4 | 760 | |
073115d6 SG |
761 | err = audit_ipc_obj(&(shp->shm_perm)); |
762 | if (err) | |
763 | goto out_unlock; | |
764 | ||
1da177e4 LT |
765 | if (!capable(CAP_IPC_LOCK)) { |
766 | err = -EPERM; | |
767 | if (current->euid != shp->shm_perm.uid && | |
768 | current->euid != shp->shm_perm.cuid) | |
769 | goto out_unlock; | |
770 | if (cmd == SHM_LOCK && | |
771 | !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur) | |
772 | goto out_unlock; | |
773 | } | |
774 | ||
775 | err = security_shm_shmctl(shp, cmd); | |
776 | if (err) | |
777 | goto out_unlock; | |
778 | ||
779 | if(cmd==SHM_LOCK) { | |
780 | struct user_struct * user = current->user; | |
781 | if (!is_file_hugepages(shp->shm_file)) { | |
782 | err = shmem_lock(shp->shm_file, 1, user); | |
7be77e20 | 783 | if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){ |
b33291c0 | 784 | shp->shm_perm.mode |= SHM_LOCKED; |
1da177e4 LT |
785 | shp->mlock_user = user; |
786 | } | |
787 | } | |
788 | } else if (!is_file_hugepages(shp->shm_file)) { | |
789 | shmem_lock(shp->shm_file, 0, shp->mlock_user); | |
b33291c0 | 790 | shp->shm_perm.mode &= ~SHM_LOCKED; |
1da177e4 LT |
791 | shp->mlock_user = NULL; |
792 | } | |
793 | shm_unlock(shp); | |
794 | goto out; | |
795 | } | |
796 | case IPC_RMID: | |
1da177e4 | 797 | case IPC_SET: |
8d4cc8b5 PP |
798 | err = shmctl_down(ns, shmid, cmd, buf, version); |
799 | return err; | |
1da177e4 | 800 | default: |
8d4cc8b5 | 801 | return -EINVAL; |
1da177e4 LT |
802 | } |
803 | ||
1da177e4 LT |
804 | out_unlock: |
805 | shm_unlock(shp); | |
806 | out: | |
807 | return err; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. | |
812 | * | |
813 | * NOTE! Despite the name, this is NOT a direct system call entrypoint. The | |
814 | * "raddr" thing points to kernel space, and there has to be a wrapper around | |
815 | * this. | |
816 | */ | |
817 | long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr) | |
818 | { | |
819 | struct shmid_kernel *shp; | |
820 | unsigned long addr; | |
821 | unsigned long size; | |
822 | struct file * file; | |
823 | int err; | |
824 | unsigned long flags; | |
825 | unsigned long prot; | |
1da177e4 | 826 | int acc_mode; |
bc56bba8 | 827 | unsigned long user_addr; |
4e982311 | 828 | struct ipc_namespace *ns; |
bc56bba8 EB |
829 | struct shm_file_data *sfd; |
830 | struct path path; | |
831 | mode_t f_mode; | |
1da177e4 | 832 | |
bc56bba8 EB |
833 | err = -EINVAL; |
834 | if (shmid < 0) | |
1da177e4 | 835 | goto out; |
bc56bba8 | 836 | else if ((addr = (ulong)shmaddr)) { |
1da177e4 LT |
837 | if (addr & (SHMLBA-1)) { |
838 | if (shmflg & SHM_RND) | |
839 | addr &= ~(SHMLBA-1); /* round down */ | |
840 | else | |
841 | #ifndef __ARCH_FORCE_SHMLBA | |
842 | if (addr & ~PAGE_MASK) | |
843 | #endif | |
bc56bba8 | 844 | goto out; |
1da177e4 LT |
845 | } |
846 | flags = MAP_SHARED | MAP_FIXED; | |
847 | } else { | |
848 | if ((shmflg & SHM_REMAP)) | |
bc56bba8 | 849 | goto out; |
1da177e4 LT |
850 | |
851 | flags = MAP_SHARED; | |
852 | } | |
853 | ||
854 | if (shmflg & SHM_RDONLY) { | |
855 | prot = PROT_READ; | |
1da177e4 | 856 | acc_mode = S_IRUGO; |
bc56bba8 | 857 | f_mode = FMODE_READ; |
1da177e4 LT |
858 | } else { |
859 | prot = PROT_READ | PROT_WRITE; | |
1da177e4 | 860 | acc_mode = S_IRUGO | S_IWUGO; |
bc56bba8 | 861 | f_mode = FMODE_READ | FMODE_WRITE; |
1da177e4 LT |
862 | } |
863 | if (shmflg & SHM_EXEC) { | |
864 | prot |= PROT_EXEC; | |
865 | acc_mode |= S_IXUGO; | |
866 | } | |
867 | ||
868 | /* | |
869 | * We cannot rely on the fs check since SYSV IPC does have an | |
870 | * additional creator id... | |
871 | */ | |
4e982311 | 872 | ns = current->nsproxy->ipc_ns; |
023a5355 ND |
873 | shp = shm_lock_check(ns, shmid); |
874 | if (IS_ERR(shp)) { | |
875 | err = PTR_ERR(shp); | |
1da177e4 | 876 | goto out; |
023a5355 | 877 | } |
bc56bba8 EB |
878 | |
879 | err = -EACCES; | |
880 | if (ipcperms(&shp->shm_perm, acc_mode)) | |
881 | goto out_unlock; | |
1da177e4 LT |
882 | |
883 | err = security_shm_shmat(shp, shmaddr, shmflg); | |
bc56bba8 EB |
884 | if (err) |
885 | goto out_unlock; | |
886 | ||
887 | path.dentry = dget(shp->shm_file->f_path.dentry); | |
ce8d2cdf | 888 | path.mnt = shp->shm_file->f_path.mnt; |
1da177e4 | 889 | shp->shm_nattch++; |
bc56bba8 | 890 | size = i_size_read(path.dentry->d_inode); |
1da177e4 LT |
891 | shm_unlock(shp); |
892 | ||
bc56bba8 EB |
893 | err = -ENOMEM; |
894 | sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); | |
895 | if (!sfd) | |
ce8d2cdf | 896 | goto out_put_dentry; |
bc56bba8 | 897 | |
ce8d2cdf | 898 | file = alloc_file(path.mnt, path.dentry, f_mode, &shm_file_operations); |
bc56bba8 EB |
899 | if (!file) |
900 | goto out_free; | |
901 | ||
bc56bba8 | 902 | file->private_data = sfd; |
bc56bba8 | 903 | file->f_mapping = shp->shm_file->f_mapping; |
7ca7e564 | 904 | sfd->id = shp->shm_perm.id; |
bc56bba8 EB |
905 | sfd->ns = get_ipc_ns(ns); |
906 | sfd->file = shp->shm_file; | |
907 | sfd->vm_ops = NULL; | |
908 | ||
1da177e4 LT |
909 | down_write(¤t->mm->mmap_sem); |
910 | if (addr && !(shmflg & SHM_REMAP)) { | |
bc56bba8 | 911 | err = -EINVAL; |
1da177e4 LT |
912 | if (find_vma_intersection(current->mm, addr, addr + size)) |
913 | goto invalid; | |
914 | /* | |
915 | * If shm segment goes below stack, make sure there is some | |
916 | * space left for the stack to grow (at least 4 pages). | |
917 | */ | |
918 | if (addr < current->mm->start_stack && | |
919 | addr > current->mm->start_stack - size - PAGE_SIZE * 5) | |
920 | goto invalid; | |
921 | } | |
922 | ||
bc56bba8 EB |
923 | user_addr = do_mmap (file, addr, size, prot, flags, 0); |
924 | *raddr = user_addr; | |
925 | err = 0; | |
926 | if (IS_ERR_VALUE(user_addr)) | |
927 | err = (long)user_addr; | |
1da177e4 LT |
928 | invalid: |
929 | up_write(¤t->mm->mmap_sem); | |
930 | ||
bc56bba8 EB |
931 | fput(file); |
932 | ||
933 | out_nattch: | |
3e148c79 ND |
934 | down_write(&shm_ids(ns).rw_mutex); |
935 | shp = shm_lock_down(ns, shmid); | |
023a5355 | 936 | BUG_ON(IS_ERR(shp)); |
1da177e4 LT |
937 | shp->shm_nattch--; |
938 | if(shp->shm_nattch == 0 && | |
b33291c0 | 939 | shp->shm_perm.mode & SHM_DEST) |
4e982311 | 940 | shm_destroy(ns, shp); |
1da177e4 LT |
941 | else |
942 | shm_unlock(shp); | |
3e148c79 | 943 | up_write(&shm_ids(ns).rw_mutex); |
1da177e4 | 944 | |
1da177e4 LT |
945 | out: |
946 | return err; | |
bc56bba8 EB |
947 | |
948 | out_unlock: | |
949 | shm_unlock(shp); | |
950 | goto out; | |
951 | ||
952 | out_free: | |
953 | kfree(sfd); | |
ce8d2cdf | 954 | out_put_dentry: |
bc56bba8 | 955 | dput(path.dentry); |
bc56bba8 | 956 | goto out_nattch; |
1da177e4 LT |
957 | } |
958 | ||
7d87e14c SR |
959 | asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) |
960 | { | |
961 | unsigned long ret; | |
962 | long err; | |
963 | ||
964 | err = do_shmat(shmid, shmaddr, shmflg, &ret); | |
965 | if (err) | |
966 | return err; | |
967 | force_successful_syscall_return(); | |
968 | return (long)ret; | |
969 | } | |
970 | ||
1da177e4 LT |
971 | /* |
972 | * detach and kill segment if marked destroyed. | |
973 | * The work is done in shm_close. | |
974 | */ | |
975 | asmlinkage long sys_shmdt(char __user *shmaddr) | |
976 | { | |
977 | struct mm_struct *mm = current->mm; | |
978 | struct vm_area_struct *vma, *next; | |
979 | unsigned long addr = (unsigned long)shmaddr; | |
980 | loff_t size = 0; | |
981 | int retval = -EINVAL; | |
982 | ||
df1e2fb5 HD |
983 | if (addr & ~PAGE_MASK) |
984 | return retval; | |
985 | ||
1da177e4 LT |
986 | down_write(&mm->mmap_sem); |
987 | ||
988 | /* | |
989 | * This function tries to be smart and unmap shm segments that | |
990 | * were modified by partial mlock or munmap calls: | |
991 | * - It first determines the size of the shm segment that should be | |
992 | * unmapped: It searches for a vma that is backed by shm and that | |
993 | * started at address shmaddr. It records it's size and then unmaps | |
994 | * it. | |
995 | * - Then it unmaps all shm vmas that started at shmaddr and that | |
996 | * are within the initially determined size. | |
997 | * Errors from do_munmap are ignored: the function only fails if | |
998 | * it's called with invalid parameters or if it's called to unmap | |
999 | * a part of a vma. Both calls in this function are for full vmas, | |
1000 | * the parameters are directly copied from the vma itself and always | |
1001 | * valid - therefore do_munmap cannot fail. (famous last words?) | |
1002 | */ | |
1003 | /* | |
1004 | * If it had been mremap()'d, the starting address would not | |
1005 | * match the usual checks anyway. So assume all vma's are | |
1006 | * above the starting address given. | |
1007 | */ | |
1008 | vma = find_vma(mm, addr); | |
1009 | ||
1010 | while (vma) { | |
1011 | next = vma->vm_next; | |
1012 | ||
1013 | /* | |
1014 | * Check if the starting address would match, i.e. it's | |
1015 | * a fragment created by mprotect() and/or munmap(), or it | |
1016 | * otherwise it starts at this address with no hassles. | |
1017 | */ | |
bc56bba8 | 1018 | if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4 LT |
1019 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
1020 | ||
1021 | ||
6d63079a | 1022 | size = vma->vm_file->f_path.dentry->d_inode->i_size; |
1da177e4 LT |
1023 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); |
1024 | /* | |
1025 | * We discovered the size of the shm segment, so | |
1026 | * break out of here and fall through to the next | |
1027 | * loop that uses the size information to stop | |
1028 | * searching for matching vma's. | |
1029 | */ | |
1030 | retval = 0; | |
1031 | vma = next; | |
1032 | break; | |
1033 | } | |
1034 | vma = next; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * We need look no further than the maximum address a fragment | |
1039 | * could possibly have landed at. Also cast things to loff_t to | |
1040 | * prevent overflows and make comparisions vs. equal-width types. | |
1041 | */ | |
8e36709d | 1042 | size = PAGE_ALIGN(size); |
1da177e4 LT |
1043 | while (vma && (loff_t)(vma->vm_end - addr) <= size) { |
1044 | next = vma->vm_next; | |
1045 | ||
1046 | /* finding a matching vma now does not alter retval */ | |
bc56bba8 | 1047 | if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4 LT |
1048 | (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) |
1049 | ||
1050 | do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); | |
1051 | vma = next; | |
1052 | } | |
1053 | ||
1054 | up_write(&mm->mmap_sem); | |
1055 | return retval; | |
1056 | } | |
1057 | ||
1058 | #ifdef CONFIG_PROC_FS | |
19b4946c | 1059 | static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1da177e4 | 1060 | { |
19b4946c | 1061 | struct shmid_kernel *shp = it; |
1da177e4 | 1062 | |
6c826818 PM |
1063 | #if BITS_PER_LONG <= 32 |
1064 | #define SIZE_SPEC "%10lu" | |
1065 | #else | |
1066 | #define SIZE_SPEC "%21lu" | |
1067 | #endif | |
1da177e4 | 1068 | |
6c826818 PM |
1069 | return seq_printf(s, |
1070 | "%10d %10d %4o " SIZE_SPEC " %5u %5u " | |
1071 | "%5lu %5u %5u %5u %5u %10lu %10lu %10lu\n", | |
19b4946c | 1072 | shp->shm_perm.key, |
7ca7e564 | 1073 | shp->shm_perm.id, |
b33291c0 | 1074 | shp->shm_perm.mode, |
19b4946c MW |
1075 | shp->shm_segsz, |
1076 | shp->shm_cprid, | |
1077 | shp->shm_lprid, | |
bc56bba8 | 1078 | shp->shm_nattch, |
19b4946c MW |
1079 | shp->shm_perm.uid, |
1080 | shp->shm_perm.gid, | |
1081 | shp->shm_perm.cuid, | |
1082 | shp->shm_perm.cgid, | |
1083 | shp->shm_atim, | |
1084 | shp->shm_dtim, | |
1085 | shp->shm_ctim); | |
1da177e4 LT |
1086 | } |
1087 | #endif |