Blame view
ipc/shm.c
25.7 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
/* * linux/ipc/shm.c * Copyright (C) 1992, 1993 Krishna Balasubramanian * Many improvements/fixes by Bruno Haible. * Replaced `struct shm_desc' by `struct vm_area_struct', July 1994. * Fixed the shm swap deallocation (shm_unuse()), August 1998 Andrea Arcangeli. * * /proc/sysvipc/shm support (c) 1999 Dragos Acostachioaie <dragos@iname.com> * BIGMEM support, Andrea Arcangeli <andrea@suse.de> * SMP thread shm, Jean-Luc Boyard <jean-luc.boyard@siemens.fr> * HIGHMEM support, Ingo Molnar <mingo@redhat.com> * Make shmmax, shmall, shmmni sysctl'able, Christoph Rohland <cr@sap.com> * Shared /dev/zero support, Kanoj Sarcar <kanoj@sgi.com> * Move the mm functionality over to mm/shmem.c, Christoph Rohland <cr@sap.com> * |
073115d6b [PATCH] Rework of... |
16 17 |
* support for audit of ipc object properties and permission changes * Dustin Kirkland <dustin.kirkland@us.ibm.com> |
4e9823111 [PATCH] IPC names... |
18 19 20 21 |
* * namespaces support * OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
1da177e4c Linux-2.6.12-rc2 |
22 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
23 24 25 26 27 28 29 |
#include <linux/slab.h> #include <linux/mm.h> #include <linux/hugetlb.h> #include <linux/shm.h> #include <linux/init.h> #include <linux/file.h> #include <linux/mman.h> |
1da177e4c Linux-2.6.12-rc2 |
30 31 32 33 |
#include <linux/shmem_fs.h> #include <linux/security.h> #include <linux/syscalls.h> #include <linux/audit.h> |
c59ede7b7 [PATCH] move capa... |
34 |
#include <linux/capability.h> |
7d87e14c2 [PATCH] consolida... |
35 |
#include <linux/ptrace.h> |
19b4946ca [PATCH] ipc: conv... |
36 |
#include <linux/seq_file.h> |
5f921ae96 [PATCH] sem2mutex... |
37 |
#include <linux/mutex.h> |
4e9823111 [PATCH] IPC names... |
38 |
#include <linux/nsproxy.h> |
bc56bba8f [PATCH] shm: make... |
39 |
#include <linux/mount.h> |
7d87e14c2 [PATCH] consolida... |
40 |
|
1da177e4c Linux-2.6.12-rc2 |
41 42 43 |
#include <asm/uaccess.h> #include "util.h" |
bc56bba8f [PATCH] shm: make... |
44 45 46 47 48 49 50 51 |
struct shm_file_data { int id; struct ipc_namespace *ns; struct file *file; const struct vm_operations_struct *vm_ops; }; #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data)) |
9a32144e9 [PATCH] mark stru... |
52 |
static const struct file_operations shm_file_operations; |
1da177e4c Linux-2.6.12-rc2 |
53 |
static struct vm_operations_struct shm_vm_ops; |
4e9823111 [PATCH] IPC names... |
54 55 56 |
static struct ipc_ids init_shm_ids; #define shm_ids(ns) (*((ns)->ids[IPC_SHM_IDS])) |
1da177e4c Linux-2.6.12-rc2 |
57 |
|
4e9823111 [PATCH] IPC names... |
58 59 60 61 62 63 64 65 |
#define shm_lock(ns, id) \ ((struct shmid_kernel*)ipc_lock(&shm_ids(ns),id)) #define shm_unlock(shp) \ ipc_unlock(&(shp)->shm_perm) #define shm_get(ns, id) \ ((struct shmid_kernel*)ipc_get(&shm_ids(ns),id)) #define shm_buildid(ns, id, seq) \ ipc_buildid(&shm_ids(ns), id, seq) |
1da177e4c Linux-2.6.12-rc2 |
66 |
|
4e9823111 [PATCH] IPC names... |
67 68 |
static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size); |
bc56bba8f [PATCH] shm: make... |
69 70 |
static void shm_open(struct vm_area_struct *vma); static void shm_close(struct vm_area_struct *vma); |
4e9823111 [PATCH] IPC names... |
71 |
static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp); |
1da177e4c Linux-2.6.12-rc2 |
72 |
#ifdef CONFIG_PROC_FS |
19b4946ca [PATCH] ipc: conv... |
73 |
static int sysvipc_shm_proc_show(struct seq_file *s, void *it); |
1da177e4c Linux-2.6.12-rc2 |
74 |
#endif |
4e9823111 [PATCH] IPC names... |
75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 |
static void __ipc_init __shm_init_ns(struct ipc_namespace *ns, struct ipc_ids *ids) { ns->ids[IPC_SHM_IDS] = ids; ns->shm_ctlmax = SHMMAX; ns->shm_ctlall = SHMALL; ns->shm_ctlmni = SHMMNI; ns->shm_tot = 0; ipc_init_ids(ids, 1); } static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp) { if (shp->shm_nattch){ shp->shm_perm.mode |= SHM_DEST; /* Do not find it any more */ shp->shm_perm.key = IPC_PRIVATE; shm_unlock(shp); } else shm_destroy(ns, shp); } #ifdef CONFIG_IPC_NS int shm_init_ns(struct ipc_namespace *ns) { struct ipc_ids *ids; ids = kmalloc(sizeof(struct ipc_ids), GFP_KERNEL); if (ids == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
104 |
|
4e9823111 [PATCH] IPC names... |
105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 |
__shm_init_ns(ns, ids); return 0; } void shm_exit_ns(struct ipc_namespace *ns) { int i; struct shmid_kernel *shp; mutex_lock(&shm_ids(ns).mutex); for (i = 0; i <= shm_ids(ns).max_id; i++) { shp = shm_lock(ns, i); if (shp == NULL) continue; do_shm_rmid(ns, shp); } mutex_unlock(&shm_ids(ns).mutex); |
c7e12b838 [PATCH] Fix ipc e... |
123 |
ipc_fini_ids(ns->ids[IPC_SHM_IDS]); |
4e9823111 [PATCH] IPC names... |
124 125 126 127 |
kfree(ns->ids[IPC_SHM_IDS]); ns->ids[IPC_SHM_IDS] = NULL; } #endif |
1da177e4c Linux-2.6.12-rc2 |
128 129 130 |
void __init shm_init (void) { |
4e9823111 [PATCH] IPC names... |
131 |
__shm_init_ns(&init_ipc_ns, &init_shm_ids); |
19b4946ca [PATCH] ipc: conv... |
132 133 134 |
ipc_init_proc_interface("sysvipc/shm", " key shmid perms size cpid lpid nattch uid gid cuid cgid atime dtime ctime ", |
4e9823111 [PATCH] IPC names... |
135 |
IPC_SHM_IDS, sysvipc_shm_proc_show); |
1da177e4c Linux-2.6.12-rc2 |
136 |
} |
4e9823111 [PATCH] IPC names... |
137 138 |
static inline int shm_checkid(struct ipc_namespace *ns, struct shmid_kernel *s, int id) |
1da177e4c Linux-2.6.12-rc2 |
139 |
{ |
4e9823111 [PATCH] IPC names... |
140 |
if (ipc_checkid(&shm_ids(ns), &s->shm_perm, id)) |
1da177e4c Linux-2.6.12-rc2 |
141 142 143 |
return -EIDRM; return 0; } |
4e9823111 [PATCH] IPC names... |
144 |
static inline struct shmid_kernel *shm_rmid(struct ipc_namespace *ns, int id) |
1da177e4c Linux-2.6.12-rc2 |
145 |
{ |
4e9823111 [PATCH] IPC names... |
146 |
return (struct shmid_kernel *)ipc_rmid(&shm_ids(ns), id); |
1da177e4c Linux-2.6.12-rc2 |
147 |
} |
4e9823111 [PATCH] IPC names... |
148 |
static inline int shm_addid(struct ipc_namespace *ns, struct shmid_kernel *shp) |
1da177e4c Linux-2.6.12-rc2 |
149 |
{ |
4e9823111 [PATCH] IPC names... |
150 |
return ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni); |
1da177e4c Linux-2.6.12-rc2 |
151 |
} |
bc56bba8f [PATCH] shm: make... |
152 153 |
/* This is called by fork, once for every shm attach. */ static void shm_open(struct vm_area_struct *vma) |
4e9823111 [PATCH] IPC names... |
154 |
{ |
bc56bba8f [PATCH] shm: make... |
155 156 |
struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); |
1da177e4c Linux-2.6.12-rc2 |
157 |
struct shmid_kernel *shp; |
bc56bba8f [PATCH] shm: make... |
158 |
shp = shm_lock(sfd->ns, sfd->id); |
9ba025f10 BUG_ON() Conversi... |
159 |
BUG_ON(!shp); |
1da177e4c Linux-2.6.12-rc2 |
160 161 162 163 164 |
shp->shm_atim = get_seconds(); shp->shm_lprid = current->tgid; shp->shm_nattch++; shm_unlock(shp); } |
1da177e4c Linux-2.6.12-rc2 |
165 166 167 168 169 |
/* * shm_destroy - free the struct shmid_kernel * * @shp: struct to free * |
5f921ae96 [PATCH] sem2mutex... |
170 |
* It has to be called with shp and shm_ids.mutex locked, |
1da177e4c Linux-2.6.12-rc2 |
171 172 |
* but returns with shp unlocked and freed. */ |
4e9823111 [PATCH] IPC names... |
173 |
static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp) |
1da177e4c Linux-2.6.12-rc2 |
174 |
{ |
4e9823111 [PATCH] IPC names... |
175 176 |
ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT; shm_rmid(ns, shp->id); |
1da177e4c Linux-2.6.12-rc2 |
177 178 179 180 |
shm_unlock(shp); if (!is_file_hugepages(shp->shm_file)) shmem_lock(shp->shm_file, 0, shp->mlock_user); else |
6d63079ad [PATCH] struct pa... |
181 |
user_shm_unlock(shp->shm_file->f_path.dentry->d_inode->i_size, |
1da177e4c Linux-2.6.12-rc2 |
182 183 184 185 186 187 188 |
shp->mlock_user); fput (shp->shm_file); security_shm_free(shp); ipc_rcu_putref(shp); } /* |
bc56bba8f [PATCH] shm: make... |
189 |
* remove the attach descriptor vma. |
1da177e4c Linux-2.6.12-rc2 |
190 191 192 193 |
* free memory for segment if it is marked destroyed. * The descriptor has already been removed from the current->mm->mmap list * and will later be kfree()d. */ |
bc56bba8f [PATCH] shm: make... |
194 |
static void shm_close(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
195 |
{ |
bc56bba8f [PATCH] shm: make... |
196 197 |
struct file * file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); |
1da177e4c Linux-2.6.12-rc2 |
198 |
struct shmid_kernel *shp; |
bc56bba8f [PATCH] shm: make... |
199 |
struct ipc_namespace *ns = sfd->ns; |
4e9823111 [PATCH] IPC names... |
200 201 |
mutex_lock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
202 |
/* remove from the list of attaches of the shm segment */ |
bc56bba8f [PATCH] shm: make... |
203 |
shp = shm_lock(ns, sfd->id); |
9ba025f10 BUG_ON() Conversi... |
204 |
BUG_ON(!shp); |
1da177e4c Linux-2.6.12-rc2 |
205 206 207 208 |
shp->shm_lprid = current->tgid; shp->shm_dtim = get_seconds(); shp->shm_nattch--; if(shp->shm_nattch == 0 && |
b33291c0b [PATCH] ipc: expa... |
209 |
shp->shm_perm.mode & SHM_DEST) |
4e9823111 [PATCH] IPC names... |
210 |
shm_destroy(ns, shp); |
1da177e4c Linux-2.6.12-rc2 |
211 212 |
else shm_unlock(shp); |
4e9823111 [PATCH] IPC names... |
213 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
214 |
} |
de01bad2f [PATCH] make ipc/... |
215 216 |
static struct page *shm_nopage(struct vm_area_struct *vma, unsigned long address, int *type) |
bc56bba8f [PATCH] shm: make... |
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 |
{ struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); return sfd->vm_ops->nopage(vma, address, type); } #ifdef CONFIG_NUMA int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) { struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); int err = 0; if (sfd->vm_ops->set_policy) err = sfd->vm_ops->set_policy(vma, new); return err; } struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr) { struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); struct mempolicy *pol = NULL; if (sfd->vm_ops->get_policy) pol = sfd->vm_ops->get_policy(vma, addr); else pol = vma->vm_policy; return pol; } #endif |
1da177e4c Linux-2.6.12-rc2 |
248 249 |
static int shm_mmap(struct file * file, struct vm_area_struct * vma) { |
bc56bba8f [PATCH] shm: make... |
250 |
struct shm_file_data *sfd = shm_file_data(file); |
b0e15190e [PATCH] NOMMU: Ma... |
251 |
int ret; |
bc56bba8f [PATCH] shm: make... |
252 253 254 255 256 257 |
ret = sfd->file->f_op->mmap(sfd->file, vma); if (ret != 0) return ret; sfd->vm_ops = vma->vm_ops; vma->vm_ops = &shm_vm_ops; shm_open(vma); |
b0e15190e [PATCH] NOMMU: Ma... |
258 259 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
260 |
} |
4e9823111 [PATCH] IPC names... |
261 262 |
static int shm_release(struct inode *ino, struct file *file) { |
bc56bba8f [PATCH] shm: make... |
263 |
struct shm_file_data *sfd = shm_file_data(file); |
4e9823111 [PATCH] IPC names... |
264 |
|
bc56bba8f [PATCH] shm: make... |
265 266 267 |
put_ipc_ns(sfd->ns); shm_file_data(file) = NULL; kfree(sfd); |
4e9823111 [PATCH] IPC names... |
268 269 |
return 0; } |
516dffdcd [PATCH] Fix get_u... |
270 271 272 273 274 275 276 277 278 279 280 |
static int shm_fsync(struct file *file, struct dentry *dentry, int datasync) { int (*fsync) (struct file *, struct dentry *, int datasync); struct shm_file_data *sfd = shm_file_data(file); int ret = -EINVAL; fsync = sfd->file->f_op->fsync; if (fsync) ret = fsync(sfd->file, sfd->file->f_path.dentry, datasync); return ret; } |
bc56bba8f [PATCH] shm: make... |
281 282 283 284 285 |
static unsigned long shm_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct shm_file_data *sfd = shm_file_data(file); |
516dffdcd [PATCH] Fix get_u... |
286 287 288 289 290 291 292 293 294 295 296 297 298 |
return get_unmapped_area(sfd->file, addr, len, pgoff, flags); } int is_file_shm_hugepages(struct file *file) { int ret = 0; if (file->f_op == &shm_file_operations) { struct shm_file_data *sfd; sfd = shm_file_data(file); ret = is_file_hugepages(sfd->file); } return ret; |
bc56bba8f [PATCH] shm: make... |
299 |
} |
bc56bba8f [PATCH] shm: make... |
300 |
|
9a32144e9 [PATCH] mark stru... |
301 |
static const struct file_operations shm_file_operations = { |
4e9823111 [PATCH] IPC names... |
302 |
.mmap = shm_mmap, |
516dffdcd [PATCH] Fix get_u... |
303 |
.fsync = shm_fsync, |
4e9823111 [PATCH] IPC names... |
304 |
.release = shm_release, |
bc56bba8f [PATCH] shm: make... |
305 |
.get_unmapped_area = shm_get_unmapped_area, |
1da177e4c Linux-2.6.12-rc2 |
306 307 308 309 310 |
}; static struct vm_operations_struct shm_vm_ops = { .open = shm_open, /* callback for a new vm-area open */ .close = shm_close, /* callback for when the vm-area is released */ |
bc56bba8f [PATCH] shm: make... |
311 312 313 314 |
.nopage = shm_nopage, #if defined(CONFIG_NUMA) .set_policy = shm_set_policy, .get_policy = shm_get_policy, |
1da177e4c Linux-2.6.12-rc2 |
315 316 |
#endif }; |
4e9823111 [PATCH] IPC names... |
317 |
static int newseg (struct ipc_namespace *ns, key_t key, int shmflg, size_t size) |
1da177e4c Linux-2.6.12-rc2 |
318 319 320 321 322 323 324 |
{ int error; struct shmid_kernel *shp; int numpages = (size + PAGE_SIZE -1) >> PAGE_SHIFT; struct file * file; char name[13]; int id; |
4e9823111 [PATCH] IPC names... |
325 |
if (size < SHMMIN || size > ns->shm_ctlmax) |
1da177e4c Linux-2.6.12-rc2 |
326 |
return -EINVAL; |
f66d45e99 [PATCH] correct s... |
327 |
if (ns->shm_tot + numpages > ns->shm_ctlall) |
1da177e4c Linux-2.6.12-rc2 |
328 329 330 331 332 333 334 |
return -ENOSPC; shp = ipc_rcu_alloc(sizeof(*shp)); if (!shp) return -ENOMEM; shp->shm_perm.key = key; |
b33291c0b [PATCH] ipc: expa... |
335 |
shp->shm_perm.mode = (shmflg & S_IRWXUGO); |
1da177e4c Linux-2.6.12-rc2 |
336 337 338 339 340 341 342 343 344 345 346 347 348 349 |
shp->mlock_user = NULL; shp->shm_perm.security = NULL; error = security_shm_alloc(shp); if (error) { ipc_rcu_putref(shp); return error; } if (shmflg & SHM_HUGETLB) { /* hugetlb_zero_setup takes care of mlock user accounting */ file = hugetlb_zero_setup(size); shp->mlock_user = current->user; } else { |
bf8f972d3 [PATCH] SHM_NORES... |
350 351 352 353 354 355 356 357 |
int acctflag = VM_ACCOUNT; /* * Do not allow no accounting for OVERCOMMIT_NEVER, even * if it's asked for. */ if ((shmflg & SHM_NORESERVE) && sysctl_overcommit_memory != OVERCOMMIT_NEVER) acctflag = 0; |
1da177e4c Linux-2.6.12-rc2 |
358 |
sprintf (name, "SYSV%08x", key); |
bf8f972d3 [PATCH] SHM_NORES... |
359 |
file = shmem_file_setup(name, size, acctflag); |
1da177e4c Linux-2.6.12-rc2 |
360 361 362 363 364 365 |
} error = PTR_ERR(file); if (IS_ERR(file)) goto no_file; error = -ENOSPC; |
4e9823111 [PATCH] IPC names... |
366 |
id = shm_addid(ns, shp); |
1da177e4c Linux-2.6.12-rc2 |
367 368 369 370 371 372 373 374 375 |
if(id == -1) goto no_id; shp->shm_cprid = current->tgid; shp->shm_lprid = 0; shp->shm_atim = shp->shm_dtim = 0; shp->shm_ctim = get_seconds(); shp->shm_segsz = size; shp->shm_nattch = 0; |
4e9823111 [PATCH] IPC names... |
376 |
shp->id = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4c Linux-2.6.12-rc2 |
377 |
shp->shm_file = file; |
551110a94 [PATCH] hugetlb: ... |
378 |
|
4e9823111 [PATCH] IPC names... |
379 |
ns->shm_tot += numpages; |
1da177e4c Linux-2.6.12-rc2 |
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 |
shm_unlock(shp); return shp->id; no_id: fput(file); no_file: security_shm_free(shp); ipc_rcu_putref(shp); return error; } asmlinkage long sys_shmget (key_t key, size_t size, int shmflg) { struct shmid_kernel *shp; int err, id = 0; |
4e9823111 [PATCH] IPC names... |
395 396 397 |
struct ipc_namespace *ns; ns = current->nsproxy->ipc_ns; |
1da177e4c Linux-2.6.12-rc2 |
398 |
|
4e9823111 [PATCH] IPC names... |
399 |
mutex_lock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
400 |
if (key == IPC_PRIVATE) { |
4e9823111 [PATCH] IPC names... |
401 402 |
err = newseg(ns, key, shmflg, size); } else if ((id = ipc_findkey(&shm_ids(ns), key)) == -1) { |
1da177e4c Linux-2.6.12-rc2 |
403 404 405 |
if (!(shmflg & IPC_CREAT)) err = -ENOENT; else |
4e9823111 [PATCH] IPC names... |
406 |
err = newseg(ns, key, shmflg, size); |
1da177e4c Linux-2.6.12-rc2 |
407 408 409 |
} else if ((shmflg & IPC_CREAT) && (shmflg & IPC_EXCL)) { err = -EEXIST; } else { |
4e9823111 [PATCH] IPC names... |
410 |
shp = shm_lock(ns, id); |
9ba025f10 BUG_ON() Conversi... |
411 |
BUG_ON(shp==NULL); |
1da177e4c Linux-2.6.12-rc2 |
412 413 414 415 416 |
if (shp->shm_segsz < size) err = -EINVAL; else if (ipcperms(&shp->shm_perm, shmflg)) err = -EACCES; else { |
4e9823111 [PATCH] IPC names... |
417 |
int shmid = shm_buildid(ns, id, shp->shm_perm.seq); |
1da177e4c Linux-2.6.12-rc2 |
418 419 420 421 422 423 |
err = security_shm_associate(shp, shmflg); if (!err) err = shmid; } shm_unlock(shp); } |
4e9823111 [PATCH] IPC names... |
424 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 |
return err; } static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version) { switch(version) { case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shmid_ds out; ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm); out.shm_segsz = in->shm_segsz; out.shm_atime = in->shm_atime; out.shm_dtime = in->shm_dtime; out.shm_ctime = in->shm_ctime; out.shm_cpid = in->shm_cpid; out.shm_lpid = in->shm_lpid; out.shm_nattch = in->shm_nattch; return copy_to_user(buf, &out, sizeof(out)); } default: return -EINVAL; } } struct shm_setbuf { uid_t uid; gid_t gid; mode_t mode; }; static inline unsigned long copy_shmid_from_user(struct shm_setbuf *out, void __user *buf, int version) { switch(version) { case IPC_64: { struct shmid64_ds tbuf; if (copy_from_user(&tbuf, buf, sizeof(tbuf))) return -EFAULT; out->uid = tbuf.shm_perm.uid; out->gid = tbuf.shm_perm.gid; |
b33291c0b [PATCH] ipc: expa... |
472 |
out->mode = tbuf.shm_perm.mode; |
1da177e4c Linux-2.6.12-rc2 |
473 474 475 476 477 478 479 480 481 482 483 484 |
return 0; } case IPC_OLD: { struct shmid_ds tbuf_old; if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) return -EFAULT; out->uid = tbuf_old.shm_perm.uid; out->gid = tbuf_old.shm_perm.gid; |
b33291c0b [PATCH] ipc: expa... |
485 |
out->mode = tbuf_old.shm_perm.mode; |
1da177e4c Linux-2.6.12-rc2 |
486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 |
return 0; } default: return -EINVAL; } } static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version) { switch(version) { case IPC_64: return copy_to_user(buf, in, sizeof(*in)); case IPC_OLD: { struct shminfo out; if(in->shmmax > INT_MAX) out.shmmax = INT_MAX; else out.shmmax = (int)in->shmmax; out.shmmin = in->shmmin; out.shmmni = in->shmmni; out.shmseg = in->shmseg; out.shmall = in->shmall; return copy_to_user(buf, &out, sizeof(out)); } default: return -EINVAL; } } |
4e9823111 [PATCH] IPC names... |
519 520 |
static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss, unsigned long *swp) |
1da177e4c Linux-2.6.12-rc2 |
521 522 523 524 525 |
{ int i; *rss = 0; *swp = 0; |
4e9823111 [PATCH] IPC names... |
526 |
for (i = 0; i <= shm_ids(ns).max_id; i++) { |
1da177e4c Linux-2.6.12-rc2 |
527 528 |
struct shmid_kernel *shp; struct inode *inode; |
4e9823111 [PATCH] IPC names... |
529 |
shp = shm_get(ns, i); |
1da177e4c Linux-2.6.12-rc2 |
530 531 |
if(!shp) continue; |
6d63079ad [PATCH] struct pa... |
532 |
inode = shp->shm_file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 |
if (is_file_hugepages(shp->shm_file)) { struct address_space *mapping = inode->i_mapping; *rss += (HPAGE_SIZE/PAGE_SIZE)*mapping->nrpages; } else { struct shmem_inode_info *info = SHMEM_I(inode); spin_lock(&info->lock); *rss += inode->i_mapping->nrpages; *swp += info->swapped; spin_unlock(&info->lock); } } } asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf) { struct shm_setbuf setbuf; struct shmid_kernel *shp; int err, version; |
4e9823111 [PATCH] IPC names... |
552 |
struct ipc_namespace *ns; |
1da177e4c Linux-2.6.12-rc2 |
553 554 555 556 557 558 559 |
if (cmd < 0 || shmid < 0) { err = -EINVAL; goto out; } version = ipc_parse_version(&cmd); |
4e9823111 [PATCH] IPC names... |
560 |
ns = current->nsproxy->ipc_ns; |
1da177e4c Linux-2.6.12-rc2 |
561 562 563 564 565 566 567 568 569 570 571 |
switch (cmd) { /* replace with proc interface ? */ case IPC_INFO: { struct shminfo64 shminfo; err = security_shm_shmctl(NULL, cmd); if (err) return err; memset(&shminfo,0,sizeof(shminfo)); |
4e9823111 [PATCH] IPC names... |
572 573 574 |
shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni; shminfo.shmmax = ns->shm_ctlmax; shminfo.shmall = ns->shm_ctlall; |
1da177e4c Linux-2.6.12-rc2 |
575 576 577 578 579 |
shminfo.shmmin = SHMMIN; if(copy_shminfo_to_user (buf, &shminfo, version)) return -EFAULT; /* reading a integer is always atomic */ |
4e9823111 [PATCH] IPC names... |
580 |
err= shm_ids(ns).max_id; |
1da177e4c Linux-2.6.12-rc2 |
581 582 583 584 585 586 587 588 589 590 591 592 593 |
if(err<0) err = 0; goto out; } case SHM_INFO: { struct shm_info shm_info; err = security_shm_shmctl(NULL, cmd); if (err) return err; memset(&shm_info,0,sizeof(shm_info)); |
4e9823111 [PATCH] IPC names... |
594 595 596 597 |
mutex_lock(&shm_ids(ns).mutex); shm_info.used_ids = shm_ids(ns).in_use; shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp); shm_info.shm_tot = ns->shm_tot; |
1da177e4c Linux-2.6.12-rc2 |
598 599 |
shm_info.swap_attempts = 0; shm_info.swap_successes = 0; |
4e9823111 [PATCH] IPC names... |
600 601 |
err = shm_ids(ns).max_id; mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 605 606 607 608 609 610 611 612 613 614 615 |
if(copy_to_user (buf, &shm_info, sizeof(shm_info))) { err = -EFAULT; goto out; } err = err < 0 ? 0 : err; goto out; } case SHM_STAT: case IPC_STAT: { struct shmid64_ds tbuf; int result; memset(&tbuf, 0, sizeof(tbuf)); |
4e9823111 [PATCH] IPC names... |
616 |
shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 621 |
if(shp==NULL) { err = -EINVAL; goto out; } else if(cmd==SHM_STAT) { err = -EINVAL; |
4e9823111 [PATCH] IPC names... |
622 |
if (shmid > shm_ids(ns).max_id) |
1da177e4c Linux-2.6.12-rc2 |
623 |
goto out_unlock; |
4e9823111 [PATCH] IPC names... |
624 |
result = shm_buildid(ns, shmid, shp->shm_perm.seq); |
1da177e4c Linux-2.6.12-rc2 |
625 |
} else { |
4e9823111 [PATCH] IPC names... |
626 |
err = shm_checkid(ns, shp,shmid); |
1da177e4c Linux-2.6.12-rc2 |
627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 |
if(err) goto out_unlock; result = 0; } err=-EACCES; if (ipcperms (&shp->shm_perm, S_IRUGO)) goto out_unlock; err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock; kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm); tbuf.shm_segsz = shp->shm_segsz; tbuf.shm_atime = shp->shm_atim; tbuf.shm_dtime = shp->shm_dtim; tbuf.shm_ctime = shp->shm_ctim; tbuf.shm_cpid = shp->shm_cprid; tbuf.shm_lpid = shp->shm_lprid; |
bc56bba8f [PATCH] shm: make... |
644 |
tbuf.shm_nattch = shp->shm_nattch; |
1da177e4c Linux-2.6.12-rc2 |
645 646 647 648 649 650 651 652 653 654 |
shm_unlock(shp); if(copy_shmid_to_user (buf, &tbuf, version)) err = -EFAULT; else err = result; goto out; } case SHM_LOCK: case SHM_UNLOCK: { |
4e9823111 [PATCH] IPC names... |
655 |
shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
656 657 658 659 |
if(shp==NULL) { err = -EINVAL; goto out; } |
4e9823111 [PATCH] IPC names... |
660 |
err = shm_checkid(ns, shp,shmid); |
1da177e4c Linux-2.6.12-rc2 |
661 662 |
if(err) goto out_unlock; |
073115d6b [PATCH] Rework of... |
663 664 665 |
err = audit_ipc_obj(&(shp->shm_perm)); if (err) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 |
if (!capable(CAP_IPC_LOCK)) { err = -EPERM; if (current->euid != shp->shm_perm.uid && current->euid != shp->shm_perm.cuid) goto out_unlock; if (cmd == SHM_LOCK && !current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur) goto out_unlock; } err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock; if(cmd==SHM_LOCK) { struct user_struct * user = current->user; if (!is_file_hugepages(shp->shm_file)) { err = shmem_lock(shp->shm_file, 1, user); if (!err) { |
b33291c0b [PATCH] ipc: expa... |
685 |
shp->shm_perm.mode |= SHM_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
686 687 688 689 690 |
shp->mlock_user = user; } } } else if (!is_file_hugepages(shp->shm_file)) { shmem_lock(shp->shm_file, 0, shp->mlock_user); |
b33291c0b [PATCH] ipc: expa... |
691 |
shp->shm_perm.mode &= ~SHM_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 |
shp->mlock_user = NULL; } shm_unlock(shp); goto out; } case IPC_RMID: { /* * We cannot simply remove the file. The SVID states * that the block remains until the last person * detaches from it, then is deleted. A shmat() on * an RMID segment is legal in older Linux and if * we change it apps break... * * Instead we set a destroyed flag, and then blow * the name away when the usage hits zero. */ |
4e9823111 [PATCH] IPC names... |
709 710 |
mutex_lock(&shm_ids(ns).mutex); shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 |
err = -EINVAL; if (shp == NULL) goto out_up; |
4e9823111 [PATCH] IPC names... |
714 |
err = shm_checkid(ns, shp, shmid); |
1da177e4c Linux-2.6.12-rc2 |
715 716 |
if(err) goto out_unlock_up; |
073115d6b [PATCH] Rework of... |
717 718 719 |
err = audit_ipc_obj(&(shp->shm_perm)); if (err) goto out_unlock_up; |
1da177e4c Linux-2.6.12-rc2 |
720 721 722 723 724 725 726 727 728 729 |
if (current->euid != shp->shm_perm.uid && current->euid != shp->shm_perm.cuid && !capable(CAP_SYS_ADMIN)) { err=-EPERM; goto out_unlock_up; } err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock_up; |
4e9823111 [PATCH] IPC names... |
730 731 |
do_shm_rmid(ns, shp); mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 735 736 737 738 739 740 |
goto out; } case IPC_SET: { if (copy_shmid_from_user (&setbuf, buf, version)) { err = -EFAULT; goto out; } |
4e9823111 [PATCH] IPC names... |
741 742 |
mutex_lock(&shm_ids(ns).mutex); shp = shm_lock(ns, shmid); |
1da177e4c Linux-2.6.12-rc2 |
743 744 745 |
err=-EINVAL; if(shp==NULL) goto out_up; |
4e9823111 [PATCH] IPC names... |
746 |
err = shm_checkid(ns, shp,shmid); |
1da177e4c Linux-2.6.12-rc2 |
747 748 |
if(err) goto out_unlock_up; |
073115d6b [PATCH] Rework of... |
749 750 751 |
err = audit_ipc_obj(&(shp->shm_perm)); if (err) goto out_unlock_up; |
ac03221a4 [PATCH] update of... |
752 |
err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode); |
073115d6b [PATCH] Rework of... |
753 754 |
if (err) goto out_unlock_up; |
1da177e4c Linux-2.6.12-rc2 |
755 756 757 758 759 760 761 762 763 764 765 766 767 |
err=-EPERM; if (current->euid != shp->shm_perm.uid && current->euid != shp->shm_perm.cuid && !capable(CAP_SYS_ADMIN)) { goto out_unlock_up; } err = security_shm_shmctl(shp, cmd); if (err) goto out_unlock_up; shp->shm_perm.uid = setbuf.uid; shp->shm_perm.gid = setbuf.gid; |
b33291c0b [PATCH] ipc: expa... |
768 |
shp->shm_perm.mode = (shp->shm_perm.mode & ~S_IRWXUGO) |
1da177e4c Linux-2.6.12-rc2 |
769 770 771 772 773 774 775 776 777 778 779 780 781 782 |
| (setbuf.mode & S_IRWXUGO); shp->shm_ctim = get_seconds(); break; } default: err = -EINVAL; goto out; } err = 0; out_unlock_up: shm_unlock(shp); out_up: |
4e9823111 [PATCH] IPC names... |
783 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 |
goto out; out_unlock: shm_unlock(shp); out: return err; } /* * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists. * * NOTE! Despite the name, this is NOT a direct system call entrypoint. The * "raddr" thing points to kernel space, and there has to be a wrapper around * this. */ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr) { struct shmid_kernel *shp; unsigned long addr; unsigned long size; struct file * file; int err; unsigned long flags; unsigned long prot; |
1da177e4c Linux-2.6.12-rc2 |
807 |
int acc_mode; |
bc56bba8f [PATCH] shm: make... |
808 |
unsigned long user_addr; |
4e9823111 [PATCH] IPC names... |
809 |
struct ipc_namespace *ns; |
bc56bba8f [PATCH] shm: make... |
810 811 812 |
struct shm_file_data *sfd; struct path path; mode_t f_mode; |
1da177e4c Linux-2.6.12-rc2 |
813 |
|
bc56bba8f [PATCH] shm: make... |
814 815 |
err = -EINVAL; if (shmid < 0) |
1da177e4c Linux-2.6.12-rc2 |
816 |
goto out; |
bc56bba8f [PATCH] shm: make... |
817 |
else if ((addr = (ulong)shmaddr)) { |
1da177e4c Linux-2.6.12-rc2 |
818 819 820 821 822 823 824 |
if (addr & (SHMLBA-1)) { if (shmflg & SHM_RND) addr &= ~(SHMLBA-1); /* round down */ else #ifndef __ARCH_FORCE_SHMLBA if (addr & ~PAGE_MASK) #endif |
bc56bba8f [PATCH] shm: make... |
825 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
826 827 828 829 |
} flags = MAP_SHARED | MAP_FIXED; } else { if ((shmflg & SHM_REMAP)) |
bc56bba8f [PATCH] shm: make... |
830 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
831 832 833 834 835 836 |
flags = MAP_SHARED; } if (shmflg & SHM_RDONLY) { prot = PROT_READ; |
1da177e4c Linux-2.6.12-rc2 |
837 |
acc_mode = S_IRUGO; |
bc56bba8f [PATCH] shm: make... |
838 |
f_mode = FMODE_READ; |
1da177e4c Linux-2.6.12-rc2 |
839 840 |
} else { prot = PROT_READ | PROT_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
841 |
acc_mode = S_IRUGO | S_IWUGO; |
bc56bba8f [PATCH] shm: make... |
842 |
f_mode = FMODE_READ | FMODE_WRITE; |
1da177e4c Linux-2.6.12-rc2 |
843 844 845 846 847 848 849 850 851 852 |
} if (shmflg & SHM_EXEC) { prot |= PROT_EXEC; acc_mode |= S_IXUGO; } /* * We cannot rely on the fs check since SYSV IPC does have an * additional creator id... */ |
4e9823111 [PATCH] IPC names... |
853 854 |
ns = current->nsproxy->ipc_ns; shp = shm_lock(ns, shmid); |
bc56bba8f [PATCH] shm: make... |
855 |
if(shp == NULL) |
1da177e4c Linux-2.6.12-rc2 |
856 |
goto out; |
bc56bba8f [PATCH] shm: make... |
857 |
|
4e9823111 [PATCH] IPC names... |
858 |
err = shm_checkid(ns, shp,shmid); |
bc56bba8f [PATCH] shm: make... |
859 860 861 862 863 864 |
if (err) goto out_unlock; err = -EACCES; if (ipcperms(&shp->shm_perm, acc_mode)) goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
865 866 |
err = security_shm_shmat(shp, shmaddr, shmflg); |
bc56bba8f [PATCH] shm: make... |
867 868 869 870 871 |
if (err) goto out_unlock; path.dentry = dget(shp->shm_file->f_path.dentry); path.mnt = mntget(shp->shm_file->f_path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
872 |
shp->shm_nattch++; |
bc56bba8f [PATCH] shm: make... |
873 |
size = i_size_read(path.dentry->d_inode); |
1da177e4c Linux-2.6.12-rc2 |
874 |
shm_unlock(shp); |
bc56bba8f [PATCH] shm: make... |
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 |
err = -ENOMEM; sfd = kzalloc(sizeof(*sfd), GFP_KERNEL); if (!sfd) goto out_put_path; err = -ENOMEM; file = get_empty_filp(); if (!file) goto out_free; file->f_op = &shm_file_operations; file->private_data = sfd; file->f_path = path; file->f_mapping = shp->shm_file->f_mapping; file->f_mode = f_mode; sfd->id = shp->id; sfd->ns = get_ipc_ns(ns); sfd->file = shp->shm_file; sfd->vm_ops = NULL; |
1da177e4c Linux-2.6.12-rc2 |
894 895 |
down_write(¤t->mm->mmap_sem); if (addr && !(shmflg & SHM_REMAP)) { |
bc56bba8f [PATCH] shm: make... |
896 |
err = -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
897 898 899 900 901 902 903 904 905 906 907 |
if (find_vma_intersection(current->mm, addr, addr + size)) goto invalid; /* * If shm segment goes below stack, make sure there is some * space left for the stack to grow (at least 4 pages). */ if (addr < current->mm->start_stack && addr > current->mm->start_stack - size - PAGE_SIZE * 5) goto invalid; } |
bc56bba8f [PATCH] shm: make... |
908 909 910 911 912 |
user_addr = do_mmap (file, addr, size, prot, flags, 0); *raddr = user_addr; err = 0; if (IS_ERR_VALUE(user_addr)) err = (long)user_addr; |
1da177e4c Linux-2.6.12-rc2 |
913 914 |
invalid: up_write(¤t->mm->mmap_sem); |
bc56bba8f [PATCH] shm: make... |
915 916 917 |
fput(file); out_nattch: |
4e9823111 [PATCH] IPC names... |
918 919 |
mutex_lock(&shm_ids(ns).mutex); shp = shm_lock(ns, shmid); |
9ba025f10 BUG_ON() Conversi... |
920 |
BUG_ON(!shp); |
1da177e4c Linux-2.6.12-rc2 |
921 922 |
shp->shm_nattch--; if(shp->shm_nattch == 0 && |
b33291c0b [PATCH] ipc: expa... |
923 |
shp->shm_perm.mode & SHM_DEST) |
4e9823111 [PATCH] IPC names... |
924 |
shm_destroy(ns, shp); |
1da177e4c Linux-2.6.12-rc2 |
925 926 |
else shm_unlock(shp); |
4e9823111 [PATCH] IPC names... |
927 |
mutex_unlock(&shm_ids(ns).mutex); |
1da177e4c Linux-2.6.12-rc2 |
928 |
|
1da177e4c Linux-2.6.12-rc2 |
929 930 |
out: return err; |
bc56bba8f [PATCH] shm: make... |
931 932 933 934 935 936 937 938 939 940 941 |
out_unlock: shm_unlock(shp); goto out; out_free: kfree(sfd); out_put_path: dput(path.dentry); mntput(path.mnt); goto out_nattch; |
1da177e4c Linux-2.6.12-rc2 |
942 |
} |
7d87e14c2 [PATCH] consolida... |
943 944 945 946 947 948 949 950 951 952 953 |
asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) { unsigned long ret; long err; err = do_shmat(shmid, shmaddr, shmflg, &ret); if (err) return err; force_successful_syscall_return(); return (long)ret; } |
1da177e4c Linux-2.6.12-rc2 |
954 955 956 957 958 959 960 961 962 963 964 |
/* * detach and kill segment if marked destroyed. * The work is done in shm_close. */ asmlinkage long sys_shmdt(char __user *shmaddr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *next; unsigned long addr = (unsigned long)shmaddr; loff_t size = 0; int retval = -EINVAL; |
df1e2fb54 [PATCH] shmdt: ch... |
965 966 |
if (addr & ~PAGE_MASK) return retval; |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 |
down_write(&mm->mmap_sem); /* * This function tries to be smart and unmap shm segments that * were modified by partial mlock or munmap calls: * - It first determines the size of the shm segment that should be * unmapped: It searches for a vma that is backed by shm and that * started at address shmaddr. It records it's size and then unmaps * it. * - Then it unmaps all shm vmas that started at shmaddr and that * are within the initially determined size. * Errors from do_munmap are ignored: the function only fails if * it's called with invalid parameters or if it's called to unmap * a part of a vma. Both calls in this function are for full vmas, * the parameters are directly copied from the vma itself and always * valid - therefore do_munmap cannot fail. (famous last words?) */ /* * If it had been mremap()'d, the starting address would not * match the usual checks anyway. So assume all vma's are * above the starting address given. */ vma = find_vma(mm, addr); while (vma) { next = vma->vm_next; /* * Check if the starting address would match, i.e. it's * a fragment created by mprotect() and/or munmap(), or it * otherwise it starts at this address with no hassles. */ |
bc56bba8f [PATCH] shm: make... |
999 |
if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4c Linux-2.6.12-rc2 |
1000 |
(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) { |
6d63079ad [PATCH] struct pa... |
1001 |
size = vma->vm_file->f_path.dentry->d_inode->i_size; |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 |
do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); /* * We discovered the size of the shm segment, so * break out of here and fall through to the next * loop that uses the size information to stop * searching for matching vma's. */ retval = 0; vma = next; break; } vma = next; } /* * We need look no further than the maximum address a fragment * could possibly have landed at. Also cast things to loff_t to * prevent overflows and make comparisions vs. equal-width types. */ |
8e36709d8 [PATCH] shmdt can... |
1021 |
size = PAGE_ALIGN(size); |
1da177e4c Linux-2.6.12-rc2 |
1022 1023 1024 1025 |
while (vma && (loff_t)(vma->vm_end - addr) <= size) { next = vma->vm_next; /* finding a matching vma now does not alter retval */ |
bc56bba8f [PATCH] shm: make... |
1026 |
if ((vma->vm_ops == &shm_vm_ops) && |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
(vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); vma = next; } up_write(&mm->mmap_sem); return retval; } #ifdef CONFIG_PROC_FS |
19b4946ca [PATCH] ipc: conv... |
1038 |
static int sysvipc_shm_proc_show(struct seq_file *s, void *it) |
1da177e4c Linux-2.6.12-rc2 |
1039 |
{ |
19b4946ca [PATCH] ipc: conv... |
1040 1041 |
struct shmid_kernel *shp = it; char *format; |
1da177e4c Linux-2.6.12-rc2 |
1042 |
|
1da177e4c Linux-2.6.12-rc2 |
1043 1044 1045 1046 |
#define SMALL_STRING "%10d %10d %4o %10u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu " #define BIG_STRING "%10d %10d %4o %21u %5u %5u %5d %5u %5u %5u %5u %10lu %10lu %10lu " |
1da177e4c Linux-2.6.12-rc2 |
1047 |
|
19b4946ca [PATCH] ipc: conv... |
1048 1049 1050 1051 1052 1053 1054 |
if (sizeof(size_t) <= sizeof(int)) format = SMALL_STRING; else format = BIG_STRING; return seq_printf(s, format, shp->shm_perm.key, shp->id, |
b33291c0b [PATCH] ipc: expa... |
1055 |
shp->shm_perm.mode, |
19b4946ca [PATCH] ipc: conv... |
1056 1057 1058 |
shp->shm_segsz, shp->shm_cprid, shp->shm_lprid, |
bc56bba8f [PATCH] shm: make... |
1059 |
shp->shm_nattch, |
19b4946ca [PATCH] ipc: conv... |
1060 1061 1062 1063 1064 1065 1066 |
shp->shm_perm.uid, shp->shm_perm.gid, shp->shm_perm.cuid, shp->shm_perm.cgid, shp->shm_atim, shp->shm_dtim, shp->shm_ctim); |
1da177e4c Linux-2.6.12-rc2 |
1067 1068 |
} #endif |