ipc/shm.c

   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  *
  16  * support for audit of ipc object properties and permission changes
  17  * Dustin Kirkland <dustin.kirkland@us.ibm.com>
  18  *
  19  * namespaces support
  20  * OpenVZ, SWsoft Inc.
  21  * Pavel Emelianov <xemul@openvz.org>
  22  *
  23  * Better ipc lock (kern_ipc_perm.lock) handling
  24  * Davidlohr Bueso <davidlohr.bueso@hp.com>, June 2013.
  25  */
  26
  27 #include <linux/slab.h>
  28 #include <linux/mm.h>
  29 #include <linux/hugetlb.h>
  30 #include <linux/shm.h>
  31 #include <linux/init.h>
  32 #include <linux/file.h>
  33 #include <linux/mman.h>
  34 #include <linux/shmem_fs.h>
  35 #include <linux/security.h>
  36 #include <linux/syscalls.h>
  37 #include <linux/audit.h>
  38 #include <linux/capability.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/rwsem.h>
  42 #include <linux/nsproxy.h>
  43 #include <linux/mount.h>
  44 #include <linux/ipc_namespace.h>
  45
  46 #include <asm/uaccess.h>
  47
  48 #include "util.h"
  49
  50 struct shm_file_data {
  51         int id;
  52         struct ipc_namespace *ns;
  53         struct file *file;
  54         const struct vm_operations_struct *vm_ops;
  55 };
  56
  57 #define shm_file_data(file) (*((struct shm_file_data **)&(file)->private_data))
  58
  59 static const struct file_operations shm_file_operations;
  60 static const struct vm_operations_struct shm_vm_ops;
  61
  62 #define shm_ids(ns)     ((ns)->ids[IPC_SHM_IDS])
  63
  64 #define shm_unlock(shp)                 \
  65         ipc_unlock(&(shp)->shm_perm)
  66
  67 static int newseg(struct ipc_namespace *, struct ipc_params *);
  68 static void shm_open(struct vm_area_struct *vma);
  69 static void shm_close(struct vm_area_struct *vma);
  70 static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
  71 #ifdef CONFIG_PROC_FS
  72 static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
  73 #endif
  74
  75 void shm_init_ns(struct ipc_namespace *ns)
  76 {
  77         ns->shm_ctlmax = SHMMAX;
  78         ns->shm_ctlall = SHMALL;
  79         ns->shm_ctlmni = SHMMNI;
  80         ns->shm_rmid_forced = 0;
  81         ns->shm_tot = 0;
  82         ipc_init_ids(&shm_ids(ns));
  83 }
  84
  85 /*
  86  * Called with shm_ids.rwsem (writer) and the shp structure locked.
  87  * Only shm_ids.rwsem remains locked on exit.
  88  */
  89 static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
  90 {
  91         struct shmid_kernel *shp;
  92         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
  93
  94         if (shp->shm_nattch){
  95                 shp->shm_perm.mode |= SHM_DEST;
  96                 /* Do not find it any more */
  97                 shp->shm_perm.key = IPC_PRIVATE;
  98                 shm_unlock(shp);
  99         } else
 100                 shm_destroy(ns, shp);
 101 }
 102
 103 #ifdef CONFIG_IPC_NS
 104 void shm_exit_ns(struct ipc_namespace *ns)
 105 {
 106         free_ipcs(ns, &shm_ids(ns), do_shm_rmid);
 107         idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr);
 108 }
 109 #endif
 110
 111 static int __init ipc_ns_init(void)
 112 {
 113         shm_init_ns(&init_ipc_ns);
 114         return 0;
 115 }
 116
 117 pure_initcall(ipc_ns_init);
 118
 119 void __init shm_init (void)
 120 {
 121         ipc_init_proc_interface("sysvipc/shm",
 122 #if BITS_PER_LONG <= 32
 123                                 "       key      shmid perms       size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime        rss       swap\n",
 124 #else
 125                                 "       key      shmid perms                  size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime                   rss                  swap\n",
 126 #endif
 127                                 IPC_SHM_IDS, sysvipc_shm_proc_show);
 128 }
 129
 130 static inline struct shmid_kernel *shm_obtain_object(struct ipc_namespace *ns, int id)
 131 {
 132         struct kern_ipc_perm *ipcp = ipc_obtain_object(&shm_ids(ns), id);
 133
 134         if (IS_ERR(ipcp))
 135                 return ERR_CAST(ipcp);
 136
 137         return container_of(ipcp, struct shmid_kernel, shm_perm);
 138 }
 139
 140 static inline struct shmid_kernel *shm_obtain_object_check(struct ipc_namespace *ns, int id)
 141 {
 142         struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&shm_ids(ns), id);
 143
 144         if (IS_ERR(ipcp))
 145                 return ERR_CAST(ipcp);
 146
 147         return container_of(ipcp, struct shmid_kernel, shm_perm);
 148 }
 149
 150 /*
 151  * shm_lock_(check_) routines are called in the paths where the rwsem
 152  * is not necessarily held.
 153  */
 154 static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
 155 {
 156         struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);
 157
 158         if (IS_ERR(ipcp))
 159                 return (struct shmid_kernel *)ipcp;
 160
 161         return container_of(ipcp, struct shmid_kernel, shm_perm);
 162 }
 163
 164 static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)
 165 {
 166         rcu_read_lock();
 167         ipc_lock_object(&ipcp->shm_perm);
 168 }
 169
 170 static void shm_rcu_free(struct rcu_head *head)
 171 {
 172         struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu);
 173         struct shmid_kernel *shp = ipc_rcu_to_struct(p);
 174
 175         security_shm_free(shp);
 176         ipc_rcu_free(head);
 177 }
 178
 179 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
 180 {
 181         ipc_rmid(&shm_ids(ns), &s->shm_perm);
 182 }
 183
 184
 185 /* This is called by fork, once for every shm attach. */
 186 static void shm_open(struct vm_area_struct *vma)
 187 {
 188         struct file *file = vma->vm_file;
 189         struct shm_file_data *sfd = shm_file_data(file);
 190         struct shmid_kernel *shp;
 191
 192         shp = shm_lock(sfd->ns, sfd->id);
 193         BUG_ON(IS_ERR(shp));
 194         shp->shm_atim = get_seconds();
 195         shp->shm_lprid = task_tgid_vnr(current);
 196         shp->shm_nattch++;
 197         shm_unlock(shp);
 198 }
 199
 200 /*
 201  * shm_destroy - free the struct shmid_kernel
 202  *
 203  * @ns: namespace
 204  * @shp: struct to free
 205  *
 206  * It has to be called with shp and shm_ids.rwsem (writer) locked,
 207  * but returns with shp unlocked and freed.
 208  */
 209 static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
 210 {
 211         ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
 212         shm_rmid(ns, shp);
 213         shm_unlock(shp);
 214         if (!is_file_hugepages(shp->shm_file))
 215                 shmem_lock(shp->shm_file, 0, shp->mlock_user);
 216         else if (shp->mlock_user)
 217                 user_shm_unlock(file_inode(shp->shm_file)->i_size,
 218                                                 shp->mlock_user);
 219         fput (shp->shm_file);
 220         ipc_rcu_putref(shp, shm_rcu_free);
 221 }
 222
 223 /*
 224  * shm_may_destroy - identifies whether shm segment should be destroyed now
 225  *
 226  * Returns true if and only if there are no active users of the segment and
 227  * one of the following is true:
 228  *
 229  * 1) shmctl(id, IPC_RMID, NULL) was called for this shp
 230  *
 231  * 2) sysctl kernel.shm_rmid_forced is set to 1.
 232  */
 233 static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
 234 {
 235         return (shp->shm_nattch == 0) &&
 236                (ns->shm_rmid_forced ||
 237                 (shp->shm_perm.mode & SHM_DEST));
 238 }
 239
 240 /*
 241  * remove the attach descriptor vma.
 242  * free memory for segment if it is marked destroyed.
 243  * The descriptor has already been removed from the current->mm->mmap list
 244  * and will later be kfree()d.
 245  */
 246 static void shm_close(struct vm_area_struct *vma)
 247 {
 248         struct file * file = vma->vm_file;
 249         struct shm_file_data *sfd = shm_file_data(file);
 250         struct shmid_kernel *shp;
 251         struct ipc_namespace *ns = sfd->ns;
 252
 253         down_write(&shm_ids(ns).rwsem);
 254         /* remove from the list of attaches of the shm segment */
 255         shp = shm_lock(ns, sfd->id);
 256         BUG_ON(IS_ERR(shp));
 257         shp->shm_lprid = task_tgid_vnr(current);
 258         shp->shm_dtim = get_seconds();
 259         shp->shm_nattch--;
 260         if (shm_may_destroy(ns, shp))
 261                 shm_destroy(ns, shp);
 262         else
 263                 shm_unlock(shp);
 264         up_write(&shm_ids(ns).rwsem);
 265 }
 266
 267 /* Called with ns->shm_ids(ns).rwsem locked */
 268 static int shm_try_destroy_current(int id, void *p, void *data)
 269 {
 270         struct ipc_namespace *ns = data;
 271         struct kern_ipc_perm *ipcp = p;
 272         struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 273
 274         if (shp->shm_creator != current)
 275                 return 0;
 276
 277         /*
 278          * Mark it as orphaned to destroy the segment when
 279          * kernel.shm_rmid_forced is changed.
 280          * It is noop if the following shm_may_destroy() returns true.
 281          */
 282         shp->shm_creator = NULL;
 283
 284         /*
 285          * Don't even try to destroy it.  If shm_rmid_forced=0 and IPC_RMID
 286          * is not set, it shouldn't be deleted here.
 287          */
 288         if (!ns->shm_rmid_forced)
 289                 return 0;
 290
 291         if (shm_may_destroy(ns, shp)) {
 292                 shm_lock_by_ptr(shp);
 293                 shm_destroy(ns, shp);
 294         }
 295         return 0;
 296 }
 297
 298 /* Called with ns->shm_ids(ns).rwsem locked */
 299 static int shm_try_destroy_orphaned(int id, void *p, void *data)
 300 {
 301         struct ipc_namespace *ns = data;
 302         struct kern_ipc_perm *ipcp = p;
 303         struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 304
 305         /*
 306          * We want to destroy segments without users and with already
 307          * exit'ed originating process.
 308          *
 309          * As shp->* are changed under rwsem, it's safe to skip shp locking.
 310          */
 311         if (shp->shm_creator != NULL)
 312                 return 0;
 313
 314         if (shm_may_destroy(ns, shp)) {
 315                 shm_lock_by_ptr(shp);
 316                 shm_destroy(ns, shp);
 317         }
 318         return 0;
 319 }
 320
 321 void shm_destroy_orphaned(struct ipc_namespace *ns)
 322 {
 323         down_write(&shm_ids(ns).rwsem);
 324         if (shm_ids(ns).in_use)
 325                 idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);
 326         up_write(&shm_ids(ns).rwsem);
 327 }
 328
 329
 330 void exit_shm(struct task_struct *task)
 331 {
 332         struct ipc_namespace *ns = task->nsproxy->ipc_ns;
 333
 334         if (shm_ids(ns).in_use == 0)
 335                 return;
 336
 337         /* Destroy all already created segments, but not mapped yet */
 338         down_write(&shm_ids(ns).rwsem);
 339         if (shm_ids(ns).in_use)
 340                 idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_current, ns);
 341         up_write(&shm_ids(ns).rwsem);
 342 }
 343
 344 static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 345 {
 346         struct file *file = vma->vm_file;
 347         struct shm_file_data *sfd = shm_file_data(file);
 348
 349         return sfd->vm_ops->fault(vma, vmf);
 350 }
 351
 352 #ifdef CONFIG_NUMA
 353 static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
 354 {
 355         struct file *file = vma->vm_file;
 356         struct shm_file_data *sfd = shm_file_data(file);
 357         int err = 0;
 358         if (sfd->vm_ops->set_policy)
 359                 err = sfd->vm_ops->set_policy(vma, new);
 360         return err;
 361 }
 362
 363 static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
 364                                         unsigned long addr)
 365 {
 366         struct file *file = vma->vm_file;
 367         struct shm_file_data *sfd = shm_file_data(file);
 368         struct mempolicy *pol = NULL;
 369
 370         if (sfd->vm_ops->get_policy)
 371                 pol = sfd->vm_ops->get_policy(vma, addr);
 372         else if (vma->vm_policy)
 373                 pol = vma->vm_policy;
 374
 375         return pol;
 376 }
 377 #endif
 378
 379 static int shm_mmap(struct file * file, struct vm_area_struct * vma)
 380 {
 381         struct shm_file_data *sfd = shm_file_data(file);
 382         int ret;
 383
 384         ret = sfd->file->f_op->mmap(sfd->file, vma);
 385         if (ret != 0)
 386                 return ret;
 387         sfd->vm_ops = vma->vm_ops;
 388 #ifdef CONFIG_MMU
 389         BUG_ON(!sfd->vm_ops->fault);
 390 #endif
 391         vma->vm_ops = &shm_vm_ops;
 392         shm_open(vma);
 393
 394         return ret;
 395 }
 396
 397 static int shm_release(struct inode *ino, struct file *file)
 398 {
 399         struct shm_file_data *sfd = shm_file_data(file);
 400
 401         put_ipc_ns(sfd->ns);
 402         shm_file_data(file) = NULL;
 403         kfree(sfd);
 404         return 0;
 405 }
 406
 407 static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 408 {
 409         struct shm_file_data *sfd = shm_file_data(file);
 410
 411         if (!sfd->file->f_op->fsync)
 412                 return -EINVAL;
 413         return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
 414 }
 415
 416 static long shm_fallocate(struct file *file, int mode, loff_t offset,
 417                           loff_t len)
 418 {
 419         struct shm_file_data *sfd = shm_file_data(file);
 420
 421         if (!sfd->file->f_op->fallocate)
 422                 return -EOPNOTSUPP;
 423         return sfd->file->f_op->fallocate(file, mode, offset, len);
 424 }
 425
 426 static unsigned long shm_get_unmapped_area(struct file *file,
 427         unsigned long addr, unsigned long len, unsigned long pgoff,
 428         unsigned long flags)
 429 {
 430         struct shm_file_data *sfd = shm_file_data(file);
 431         return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
 432                                                 pgoff, flags);
 433 }
 434
 435 static const struct file_operations shm_file_operations = {
 436         .mmap           = shm_mmap,
 437         .fsync          = shm_fsync,
 438         .release        = shm_release,
 439 #ifndef CONFIG_MMU
 440         .get_unmapped_area      = shm_get_unmapped_area,
 441 #endif
 442         .llseek         = noop_llseek,
 443         .fallocate      = shm_fallocate,
 444 };
 445
 446 static const struct file_operations shm_file_operations_huge = {
 447         .mmap           = shm_mmap,
 448         .fsync          = shm_fsync,
 449         .release        = shm_release,
 450         .get_unmapped_area      = shm_get_unmapped_area,
 451         .llseek         = noop_llseek,
 452         .fallocate      = shm_fallocate,
 453 };
 454
 455 int is_file_shm_hugepages(struct file *file)
 456 {
 457         return file->f_op == &shm_file_operations_huge;
 458 }
 459
 460 static const struct vm_operations_struct shm_vm_ops = {
 461         .open   = shm_open,     /* callback for a new vm-area open */
 462         .close  = shm_close,    /* callback for when the vm-area is released */
 463         .fault  = shm_fault,
 464 #if defined(CONFIG_NUMA)
 465         .set_policy = shm_set_policy,
 466         .get_policy = shm_get_policy,
 467 #endif
 468 };
 469
 470 /**
 471  * newseg - Create a new shared memory segment
 472  * @ns: namespace
 473  * @params: ptr to the structure that contains key, size and shmflg
 474  *
 475  * Called with shm_ids.rwsem held as a writer.
 476  */
 477
 478 static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 479 {
 480         key_t key = params->key;
 481         int shmflg = params->flg;
 482         size_t size = params->u.size;
 483         int error;
 484         struct shmid_kernel *shp;
 485         size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 486         struct file * file;
 487         char name[13];
 488         int id;
 489         vm_flags_t acctflag = 0;
 490
 491         if (size < SHMMIN || size > ns->shm_ctlmax)
 492                 return -EINVAL;
 493
 494         if (ns->shm_tot + numpages > ns->shm_ctlall)
 495                 return -ENOSPC;
 496
 497         shp = ipc_rcu_alloc(sizeof(*shp));
 498         if (!shp)
 499                 return -ENOMEM;
 500
 501         shp->shm_perm.key = key;
 502         shp->shm_perm.mode = (shmflg & S_IRWXUGO);
 503         shp->mlock_user = NULL;
 504
 505         shp->shm_perm.security = NULL;
 506         error = security_shm_alloc(shp);
 507         if (error) {
 508                 ipc_rcu_putref(shp, ipc_rcu_free);
 509                 return error;
 510         }
 511
 512         sprintf (name, "SYSV%08x", key);
 513         if (shmflg & SHM_HUGETLB) {
 514                 struct hstate *hs;
 515                 size_t hugesize;
 516
 517                 hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 518                 if (!hs) {
 519                         error = -EINVAL;
 520                         goto no_file;
 521                 }
 522                 hugesize = ALIGN(size, huge_page_size(hs));
 523
 524                 /* hugetlb_file_setup applies strict accounting */
 525                 if (shmflg & SHM_NORESERVE)
 526                         acctflag = VM_NORESERVE;
 527                 file = hugetlb_file_setup(name, hugesize, acctflag,
 528                                   &shp->mlock_user, HUGETLB_SHMFS_INODE,
 529                                 (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 530         } else {
 531                 /*
 532                  * Do not allow no accounting for OVERCOMMIT_NEVER, even
 533                  * if it's asked for.
 534                  */
 535                 if  ((shmflg & SHM_NORESERVE) &&
 536                                 sysctl_overcommit_memory != OVERCOMMIT_NEVER)
 537                         acctflag = VM_NORESERVE;
 538                 file = shmem_file_setup(name, size, acctflag);
 539         }
 540         error = PTR_ERR(file);
 541         if (IS_ERR(file))
 542                 goto no_file;
 543
 544         id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
 545         if (id < 0) {
 546                 error = id;
 547                 goto no_id;
 548         }
 549
 550         shp->shm_cprid = task_tgid_vnr(current);
 551         shp->shm_lprid = 0;
 552         shp->shm_atim = shp->shm_dtim = 0;
 553         shp->shm_ctim = get_seconds();
 554         shp->shm_segsz = size;
 555         shp->shm_nattch = 0;
 556         shp->shm_file = file;
 557         shp->shm_creator = current;
 558
 559         /*
 560          * shmid gets reported as "inode#" in /proc/pid/maps.
 561          * proc-ps tools use this. Changing this will break them.
 562          */
 563         file_inode(file)->i_ino = shp->shm_perm.id;
 564
 565         ns->shm_tot += numpages;
 566         error = shp->shm_perm.id;
 567
 568         ipc_unlock_object(&shp->shm_perm);
 569         rcu_read_unlock();
 570         return error;
 571
 572 no_id:
 573         if (is_file_hugepages(file) && shp->mlock_user)
 574                 user_shm_unlock(size, shp->mlock_user);
 575         fput(file);
 576 no_file:
 577         ipc_rcu_putref(shp, shm_rcu_free);
 578         return error;
 579 }
 580
 581 /*
 582  * Called with shm_ids.rwsem and ipcp locked.
 583  */
 584 static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
 585 {
 586         struct shmid_kernel *shp;
 587
 588         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 589         return security_shm_associate(shp, shmflg);
 590 }
 591
 592 /*
 593  * Called with shm_ids.rwsem and ipcp locked.
 594  */
 595 static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
 596                                 struct ipc_params *params)
 597 {
 598         struct shmid_kernel *shp;
 599
 600         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 601         if (shp->shm_segsz < params->u.size)
 602                 return -EINVAL;
 603
 604         return 0;
 605 }
 606
 607 SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
 608 {
 609         struct ipc_namespace *ns;
 610         struct ipc_ops shm_ops;
 611         struct ipc_params shm_params;
 612
 613         ns = current->nsproxy->ipc_ns;
 614
 615         shm_ops.getnew = newseg;
 616         shm_ops.associate = shm_security;
 617         shm_ops.more_checks = shm_more_checks;
 618
 619         shm_params.key = key;
 620         shm_params.flg = shmflg;
 621         shm_params.u.size = size;
 622
 623         return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
 624 }
 625
 626 static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
 627 {
 628         switch(version) {
 629         case IPC_64:
 630                 return copy_to_user(buf, in, sizeof(*in));
 631         case IPC_OLD:
 632             {
 633                 struct shmid_ds out;
 634
 635                 memset(&out, 0, sizeof(out));
 636                 ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
 637                 out.shm_segsz   = in->shm_segsz;
 638                 out.shm_atime   = in->shm_atime;
 639                 out.shm_dtime   = in->shm_dtime;
 640                 out.shm_ctime   = in->shm_ctime;
 641                 out.shm_cpid    = in->shm_cpid;
 642                 out.shm_lpid    = in->shm_lpid;
 643                 out.shm_nattch  = in->shm_nattch;
 644
 645                 return copy_to_user(buf, &out, sizeof(out));
 646             }
 647         default:
 648                 return -EINVAL;
 649         }
 650 }
 651
 652 static inline unsigned long
 653 copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
 654 {
 655         switch(version) {
 656         case IPC_64:
 657                 if (copy_from_user(out, buf, sizeof(*out)))
 658                         return -EFAULT;
 659                 return 0;
 660         case IPC_OLD:
 661             {
 662                 struct shmid_ds tbuf_old;
 663
 664                 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
 665                         return -EFAULT;
 666
 667                 out->shm_perm.uid       = tbuf_old.shm_perm.uid;
 668                 out->shm_perm.gid       = tbuf_old.shm_perm.gid;
 669                 out->shm_perm.mode      = tbuf_old.shm_perm.mode;
 670
 671                 return 0;
 672             }
 673         default:
 674                 return -EINVAL;
 675         }
 676 }
 677
 678 static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
 679 {
 680         switch(version) {
 681         case IPC_64:
 682                 return copy_to_user(buf, in, sizeof(*in));
 683         case IPC_OLD:
 684             {
 685                 struct shminfo out;
 686
 687                 if(in->shmmax > INT_MAX)
 688                         out.shmmax = INT_MAX;
 689                 else
 690                         out.shmmax = (int)in->shmmax;
 691
 692                 out.shmmin      = in->shmmin;
 693                 out.shmmni      = in->shmmni;
 694                 out.shmseg      = in->shmseg;
 695                 out.shmall      = in->shmall;
 696
 697                 return copy_to_user(buf, &out, sizeof(out));
 698             }
 699         default:
 700                 return -EINVAL;
 701         }
 702 }
 703
 704 /*
 705  * Calculate and add used RSS and swap pages of a shm.
 706  * Called with shm_ids.rwsem held as a reader
 707  */
 708 static void shm_add_rss_swap(struct shmid_kernel *shp,
 709         unsigned long *rss_add, unsigned long *swp_add)
 710 {
 711         struct inode *inode;
 712
 713         inode = file_inode(shp->shm_file);
 714
 715         if (is_file_hugepages(shp->shm_file)) {
 716                 struct address_space *mapping = inode->i_mapping;
 717                 struct hstate *h = hstate_file(shp->shm_file);
 718                 *rss_add += pages_per_huge_page(h) * mapping->nrpages;
 719         } else {
 720 #ifdef CONFIG_SHMEM
 721                 struct shmem_inode_info *info = SHMEM_I(inode);
 722                 spin_lock(&info->lock);
 723                 *rss_add += inode->i_mapping->nrpages;
 724                 *swp_add += info->swapped;
 725                 spin_unlock(&info->lock);
 726 #else
 727                 *rss_add += inode->i_mapping->nrpages;
 728 #endif
 729         }
 730 }
 731
 732 /*
 733  * Called with shm_ids.rwsem held as a reader
 734  */
 735 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
 736                 unsigned long *swp)
 737 {
 738         int next_id;
 739         int total, in_use;
 740
 741         *rss = 0;
 742         *swp = 0;
 743
 744         in_use = shm_ids(ns).in_use;
 745
 746         for (total = 0, next_id = 0; total < in_use; next_id++) {
 747                 struct kern_ipc_perm *ipc;
 748                 struct shmid_kernel *shp;
 749
 750                 ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
 751                 if (ipc == NULL)
 752                         continue;
 753                 shp = container_of(ipc, struct shmid_kernel, shm_perm);
 754
 755                 shm_add_rss_swap(shp, rss, swp);
 756
 757                 total++;
 758         }
 759 }
 760
 761 /*
 762  * This function handles some shmctl commands which require the rwsem
 763  * to be held in write mode.
 764  * NOTE: no locks must be held, the rwsem is taken inside this function.
 765  */
 766 static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
 767                        struct shmid_ds __user *buf, int version)
 768 {
 769         struct kern_ipc_perm *ipcp;
 770         struct shmid64_ds shmid64;
 771         struct shmid_kernel *shp;
 772         int err;
 773
 774         if (cmd == IPC_SET) {
 775                 if (copy_shmid_from_user(&shmid64, buf, version))
 776                         return -EFAULT;
 777         }
 778
 779         down_write(&shm_ids(ns).rwsem);
 780         rcu_read_lock();
 781
 782         ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd,
 783                                       &shmid64.shm_perm, 0);
 784         if (IS_ERR(ipcp)) {
 785                 err = PTR_ERR(ipcp);
 786                 goto out_unlock1;
 787         }
 788
 789         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 790
 791         err = security_shm_shmctl(shp, cmd);
 792         if (err)
 793                 goto out_unlock1;
 794
 795         switch (cmd) {
 796         case IPC_RMID:
 797                 ipc_lock_object(&shp->shm_perm);
 798                 /* do_shm_rmid unlocks the ipc object and rcu */
 799                 do_shm_rmid(ns, ipcp);
 800                 goto out_up;
 801         case IPC_SET:
 802                 ipc_lock_object(&shp->shm_perm);
 803                 err = ipc_update_perm(&shmid64.shm_perm, ipcp);
 804                 if (err)
 805                         goto out_unlock0;
 806                 shp->shm_ctim = get_seconds();
 807                 break;
 808         default:
 809                 err = -EINVAL;
 810                 goto out_unlock1;
 811         }
 812
 813 out_unlock0:
 814         ipc_unlock_object(&shp->shm_perm);
 815 out_unlock1:
 816         rcu_read_unlock();
 817 out_up:
 818         up_write(&shm_ids(ns).rwsem);
 819         return err;
 820 }
 821
 822 static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
 823                          int cmd, int version, void __user *buf)
 824 {
 825         int err;
 826         struct shmid_kernel *shp;
 827
 828         /* preliminary security checks for *_INFO */
 829         if (cmd == IPC_INFO || cmd == SHM_INFO) {
 830                 err = security_shm_shmctl(NULL, cmd);
 831                 if (err)
 832                         return err;
 833         }
 834
 835         switch (cmd) {
 836         case IPC_INFO:
 837         {
 838                 struct shminfo64 shminfo;
 839
 840                 memset(&shminfo, 0, sizeof(shminfo));
 841                 shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
 842                 shminfo.shmmax = ns->shm_ctlmax;
 843                 shminfo.shmall = ns->shm_ctlall;
 844
 845                 shminfo.shmmin = SHMMIN;
 846                 if(copy_shminfo_to_user (buf, &shminfo, version))
 847                         return -EFAULT;
 848
 849                 down_read(&shm_ids(ns).rwsem);
 850                 err = ipc_get_maxid(&shm_ids(ns));
 851                 up_read(&shm_ids(ns).rwsem);
 852
 853                 if(err<0)
 854                         err = 0;
 855                 goto out;
 856         }
 857         case SHM_INFO:
 858         {
 859                 struct shm_info shm_info;
 860
 861                 memset(&shm_info, 0, sizeof(shm_info));
 862                 down_read(&shm_ids(ns).rwsem);
 863                 shm_info.used_ids = shm_ids(ns).in_use;
 864                 shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
 865                 shm_info.shm_tot = ns->shm_tot;
 866                 shm_info.swap_attempts = 0;
 867                 shm_info.swap_successes = 0;
 868                 err = ipc_get_maxid(&shm_ids(ns));
 869                 up_read(&shm_ids(ns).rwsem);
 870                 if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
 871                         err = -EFAULT;
 872                         goto out;
 873                 }
 874
 875                 err = err < 0 ? 0 : err;
 876                 goto out;
 877         }
 878         case SHM_STAT:
 879         case IPC_STAT:
 880         {
 881                 struct shmid64_ds tbuf;
 882                 int result;
 883
 884                 rcu_read_lock();
 885                 if (cmd == SHM_STAT) {
 886                         shp = shm_obtain_object(ns, shmid);
 887                         if (IS_ERR(shp)) {
 888                                 err = PTR_ERR(shp);
 889                                 goto out_unlock;
 890                         }
 891                         result = shp->shm_perm.id;
 892                 } else {
 893                         shp = shm_obtain_object_check(ns, shmid);
 894                         if (IS_ERR(shp)) {
 895                                 err = PTR_ERR(shp);
 896                                 goto out_unlock;
 897                         }
 898                         result = 0;
 899                 }
 900
 901                 err = -EACCES;
 902                 if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
 903                         goto out_unlock;
 904
 905                 err = security_shm_shmctl(shp, cmd);
 906                 if (err)
 907                         goto out_unlock;
 908
 909                 memset(&tbuf, 0, sizeof(tbuf));
 910                 kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
 911                 tbuf.shm_segsz  = shp->shm_segsz;
 912                 tbuf.shm_atime  = shp->shm_atim;
 913                 tbuf.shm_dtime  = shp->shm_dtim;
 914                 tbuf.shm_ctime  = shp->shm_ctim;
 915                 tbuf.shm_cpid   = shp->shm_cprid;
 916                 tbuf.shm_lpid   = shp->shm_lprid;
 917                 tbuf.shm_nattch = shp->shm_nattch;
 918                 rcu_read_unlock();
 919
 920                 if (copy_shmid_to_user(buf, &tbuf, version))
 921                         err = -EFAULT;
 922                 else
 923                         err = result;
 924                 goto out;
 925         }
 926         default:
 927                 return -EINVAL;
 928         }
 929
 930 out_unlock:
 931         rcu_read_unlock();
 932 out:
 933         return err;
 934 }
 935
 936 SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
 937 {
 938         struct shmid_kernel *shp;
 939         int err, version;
 940         struct ipc_namespace *ns;
 941
 942         if (cmd < 0 || shmid < 0)
 943                 return -EINVAL;
 944
 945         version = ipc_parse_version(&cmd);
 946         ns = current->nsproxy->ipc_ns;
 947
 948         switch (cmd) {
 949         case IPC_INFO:
 950         case SHM_INFO:
 951         case SHM_STAT:
 952         case IPC_STAT:
 953                 return shmctl_nolock(ns, shmid, cmd, version, buf);
 954         case IPC_RMID:
 955         case IPC_SET:
 956                 return shmctl_down(ns, shmid, cmd, buf, version);
 957         case SHM_LOCK:
 958         case SHM_UNLOCK:
 959         {
 960                 struct file *shm_file;
 961
 962                 rcu_read_lock();
 963                 shp = shm_obtain_object_check(ns, shmid);
 964                 if (IS_ERR(shp)) {
 965                         err = PTR_ERR(shp);
 966                         goto out_unlock1;
 967                 }
 968
 969                 audit_ipc_obj(&(shp->shm_perm));
 970                 err = security_shm_shmctl(shp, cmd);
 971                 if (err)
 972                         goto out_unlock1;
 973
 974                 ipc_lock_object(&shp->shm_perm);
 975                 if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
 976                         kuid_t euid = current_euid();
 977                         err = -EPERM;
 978                         if (!uid_eq(euid, shp->shm_perm.uid) &&
 979                             !uid_eq(euid, shp->shm_perm.cuid))
 980                                 goto out_unlock0;
 981                         if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
 982                                 goto out_unlock0;
 983                 }
 984
 985                 shm_file = shp->shm_file;
 986                 if (is_file_hugepages(shm_file))
 987                         goto out_unlock0;
 988
 989                 if (cmd == SHM_LOCK) {
 990                         struct user_struct *user = current_user();
 991                         err = shmem_lock(shm_file, 1, user);
 992                         if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
 993                                 shp->shm_perm.mode |= SHM_LOCKED;
 994                                 shp->mlock_user = user;
 995                         }
 996                         goto out_unlock0;
 997                 }
 998
 999                 /* SHM_UNLOCK */
1000                 if (!(shp->shm_perm.mode & SHM_LOCKED))
1001                         goto out_unlock0;
1002                 shmem_lock(shm_file, 0, shp->mlock_user);
1003                 shp->shm_perm.mode &= ~SHM_LOCKED;
1004                 shp->mlock_user = NULL;
1005                 get_file(shm_file);
1006                 ipc_unlock_object(&shp->shm_perm);
1007                 rcu_read_unlock();
1008                 shmem_unlock_mapping(shm_file->f_mapping);
1009
1010                 fput(shm_file);
1011                 return err;
1012         }
1013         default:
1014                 return -EINVAL;
1015         }
1016
1017 out_unlock0:
1018         ipc_unlock_object(&shp->shm_perm);
1019 out_unlock1:
1020         rcu_read_unlock();
1021         return err;
1022 }
1023
1024 /*
1025  * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
1026  *
1027  * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
1028  * "raddr" thing points to kernel space, and there has to be a wrapper around
1029  * this.
1030  */
1031 long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
1032               unsigned long shmlba)
1033 {
1034         struct shmid_kernel *shp;
1035         unsigned long addr;
1036         unsigned long size;
1037         struct file * file;
1038         int    err;
1039         unsigned long flags;
1040         unsigned long prot;
1041         int acc_mode;
1042         struct ipc_namespace *ns;
1043         struct shm_file_data *sfd;
1044         struct path path;
1045         fmode_t f_mode;
1046         unsigned long populate = 0;
1047
1048         err = -EINVAL;
1049         if (shmid < 0)
1050                 goto out;
1051         else if ((addr = (ulong)shmaddr)) {
1052                 if (addr & (shmlba - 1)) {
1053                         if (shmflg & SHM_RND)
1054                                 addr &= ~(shmlba - 1);     /* round down */
1055                         else
1056 #ifndef __ARCH_FORCE_SHMLBA
1057                                 if (addr & ~PAGE_MASK)
1058 #endif
1059                                         goto out;
1060                 }
1061                 flags = MAP_SHARED | MAP_FIXED;
1062         } else {
1063                 if ((shmflg & SHM_REMAP))
1064                         goto out;
1065
1066                 flags = MAP_SHARED;
1067         }
1068
1069         if (shmflg & SHM_RDONLY) {
1070                 prot = PROT_READ;
1071                 acc_mode = S_IRUGO;
1072                 f_mode = FMODE_READ;
1073         } else {
1074                 prot = PROT_READ | PROT_WRITE;
1075                 acc_mode = S_IRUGO | S_IWUGO;
1076                 f_mode = FMODE_READ | FMODE_WRITE;
1077         }
1078         if (shmflg & SHM_EXEC) {
1079                 prot |= PROT_EXEC;
1080                 acc_mode |= S_IXUGO;
1081         }
1082
1083         /*
1084          * We cannot rely on the fs check since SYSV IPC does have an
1085          * additional creator id...
1086          */
1087         ns = current->nsproxy->ipc_ns;
1088         rcu_read_lock();
1089         shp = shm_obtain_object_check(ns, shmid);
1090         if (IS_ERR(shp)) {
1091                 err = PTR_ERR(shp);
1092                 goto out_unlock;
1093         }
1094
1095         err = -EACCES;
1096         if (ipcperms(ns, &shp->shm_perm, acc_mode))
1097                 goto out_unlock;
1098
1099         err = security_shm_shmat(shp, shmaddr, shmflg);
1100         if (err)
1101                 goto out_unlock;
1102
1103         ipc_lock_object(&shp->shm_perm);
1104         path = shp->shm_file->f_path;
1105         path_get(&path);
1106         shp->shm_nattch++;
1107         size = i_size_read(path.dentry->d_inode);
1108         ipc_unlock_object(&shp->shm_perm);
1109         rcu_read_unlock();
1110
1111         err = -ENOMEM;
1112         sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
1113         if (!sfd) {
1114                 path_put(&path);
1115                 goto out_nattch;
1116         }
1117
1118         file = alloc_file(&path, f_mode,
1119                           is_file_hugepages(shp->shm_file) ?
1120                                 &shm_file_operations_huge :
1121                                 &shm_file_operations);
1122         err = PTR_ERR(file);
1123         if (IS_ERR(file)) {
1124                 kfree(sfd);
1125                 path_put(&path);
1126                 goto out_nattch;
1127         }
1128
1129         file->private_data = sfd;
1130         file->f_mapping = shp->shm_file->f_mapping;
1131         sfd->id = shp->shm_perm.id;
1132         sfd->ns = get_ipc_ns(ns);
1133         sfd->file = shp->shm_file;
1134         sfd->vm_ops = NULL;
1135
1136         err = security_mmap_file(file, prot, flags);
1137         if (err)
1138                 goto out_fput;
1139
1140         down_write(&current->mm->mmap_sem);
1141         if (addr && !(shmflg & SHM_REMAP)) {
1142                 err = -EINVAL;
1143                 if (find_vma_intersection(current->mm, addr, addr + size))
1144                         goto invalid;
1145                 /*
1146                  * If shm segment goes below stack, make sure there is some
1147                  * space left for the stack to grow (at least 4 pages).
1148                  */
1149                 if (addr < current->mm->start_stack &&
1150                     addr > current->mm->start_stack - size - PAGE_SIZE * 5)
1151                         goto invalid;
1152         }
1153
1154         addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate);
1155         *raddr = addr;
1156         err = 0;
1157         if (IS_ERR_VALUE(addr))
1158                 err = (long)addr;
1159 invalid:
1160         up_write(&current->mm->mmap_sem);
1161         if (populate)
1162                 mm_populate(addr, populate);
1163
1164 out_fput:
1165         fput(file);
1166
1167 out_nattch:
1168         down_write(&shm_ids(ns).rwsem);
1169         shp = shm_lock(ns, shmid);
1170         BUG_ON(IS_ERR(shp));
1171         shp->shm_nattch--;
1172         if (shm_may_destroy(ns, shp))
1173                 shm_destroy(ns, shp);
1174         else
1175                 shm_unlock(shp);
1176         up_write(&shm_ids(ns).rwsem);
1177         return err;
1178
1179 out_unlock:
1180         rcu_read_unlock();
1181 out:
1182         return err;
1183 }
1184
1185 SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
1186 {
1187         unsigned long ret;
1188         long err;
1189
1190         err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
1191         if (err)
1192                 return err;
1193         force_successful_syscall_return();
1194         return (long)ret;
1195 }
1196
1197 /*
1198  * detach and kill segment if marked destroyed.
1199  * The work is done in shm_close.
1200  */
1201 SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
1202 {
1203         struct mm_struct *mm = current->mm;
1204         struct vm_area_struct *vma;
1205         unsigned long addr = (unsigned long)shmaddr;
1206         int retval = -EINVAL;
1207 #ifdef CONFIG_MMU
1208         loff_t size = 0;
1209         struct vm_area_struct *next;
1210 #endif
1211
1212         if (addr & ~PAGE_MASK)
1213                 return retval;
1214
1215         down_write(&mm->mmap_sem);
1216
1217         /*
1218          * This function tries to be smart and unmap shm segments that
1219          * were modified by partial mlock or munmap calls:
1220          * - It first determines the size of the shm segment that should be
1221          *   unmapped: It searches for a vma that is backed by shm and that
1222          *   started at address shmaddr. It records it's size and then unmaps
1223          *   it.
1224          * - Then it unmaps all shm vmas that started at shmaddr and that
1225          *   are within the initially determined size.
1226          * Errors from do_munmap are ignored: the function only fails if
1227          * it's called with invalid parameters or if it's called to unmap
1228          * a part of a vma. Both calls in this function are for full vmas,
1229          * the parameters are directly copied from the vma itself and always
1230          * valid - therefore do_munmap cannot fail. (famous last words?)
1231          */
1232         /*
1233          * If it had been mremap()'d, the starting address would not
1234          * match the usual checks anyway. So assume all vma's are
1235          * above the starting address given.
1236          */
1237         vma = find_vma(mm, addr);
1238
1239 #ifdef CONFIG_MMU
1240         while (vma) {
1241                 next = vma->vm_next;
1242
1243                 /*
1244                  * Check if the starting address would match, i.e. it's
1245                  * a fragment created by mprotect() and/or munmap(), or it
1246                  * otherwise it starts at this address with no hassles.
1247                  */
1248                 if ((vma->vm_ops == &shm_vm_ops) &&
1249                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
1250
1251
1252                         size = file_inode(vma->vm_file)->i_size;
1253                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1254                         /*
1255                          * We discovered the size of the shm segment, so
1256                          * break out of here and fall through to the next
1257                          * loop that uses the size information to stop
1258                          * searching for matching vma's.
1259                          */
1260                         retval = 0;
1261                         vma = next;
1262                         break;
1263                 }
1264                 vma = next;
1265         }
1266
1267         /*
1268          * We need look no further than the maximum address a fragment
1269          * could possibly have landed at. Also cast things to loff_t to
1270          * prevent overflows and make comparisons vs. equal-width types.
1271          */
1272         size = PAGE_ALIGN(size);
1273         while (vma && (loff_t)(vma->vm_end - addr) <= size) {
1274                 next = vma->vm_next;
1275
1276                 /* finding a matching vma now does not alter retval */
1277                 if ((vma->vm_ops == &shm_vm_ops) &&
1278                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff)
1279
1280                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1281                 vma = next;
1282         }
1283
1284 #else /* CONFIG_MMU */
1285         /* under NOMMU conditions, the exact address to be destroyed must be
1286          * given */
1287         if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
1288                 do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1289                 retval = 0;
1290         }
1291
1292 #endif
1293
1294         up_write(&mm->mmap_sem);
1295         return retval;
1296 }
1297
1298 #ifdef CONFIG_PROC_FS
1299 static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
1300 {
1301         struct user_namespace *user_ns = seq_user_ns(s);
1302         struct shmid_kernel *shp = it;
1303         unsigned long rss = 0, swp = 0;
1304
1305         shm_add_rss_swap(shp, &rss, &swp);
1306
1307 #if BITS_PER_LONG <= 32
1308 #define SIZE_SPEC "%10lu"
1309 #else
1310 #define SIZE_SPEC "%21lu"
1311 #endif
1312
1313         return seq_printf(s,
1314                           "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
1315                           "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
1316                           SIZE_SPEC " " SIZE_SPEC "\n",
1317                           shp->shm_perm.key,
1318                           shp->shm_perm.id,
1319                           shp->shm_perm.mode,
1320                           shp->shm_segsz,
1321                           shp->shm_cprid,
1322                           shp->shm_lprid,
1323                           shp->shm_nattch,
1324                           from_kuid_munged(user_ns, shp->shm_perm.uid),
1325                           from_kgid_munged(user_ns, shp->shm_perm.gid),
1326                           from_kuid_munged(user_ns, shp->shm_perm.cuid),
1327                           from_kgid_munged(user_ns, shp->shm_perm.cgid),
1328                           shp->shm_atim,
1329                           shp->shm_dtim,
1330                           shp->shm_ctim,
1331                           rss * PAGE_SIZE,
1332                           swp * PAGE_SIZE);
1333 }
1334 #endif