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