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         struct file *shm_file;
 212
 213         shm_file = shp->shm_file;
 214         shp->shm_file = NULL;
 215         ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
 216         shm_rmid(ns, shp);
 217         shm_unlock(shp);
 218         if (!is_file_hugepages(shm_file))
 219                 shmem_lock(shm_file, 0, shp->mlock_user);
 220         else if (shp->mlock_user)
 221                 user_shm_unlock(file_inode(shm_file)->i_size, shp->mlock_user);
 222         fput(shm_file);
 223         ipc_rcu_putref(shp, shm_rcu_free);
 224 }
 225
 226 /*
 227  * shm_may_destroy - identifies whether shm segment should be destroyed now
 228  *
 229  * Returns true if and only if there are no active users of the segment and
 230  * one of the following is true:
 231  *
 232  * 1) shmctl(id, IPC_RMID, NULL) was called for this shp
 233  *
 234  * 2) sysctl kernel.shm_rmid_forced is set to 1.
 235  */
 236 static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
 237 {
 238         return (shp->shm_nattch == 0) &&
 239                (ns->shm_rmid_forced ||
 240                 (shp->shm_perm.mode & SHM_DEST));
 241 }
 242
 243 /*
 244  * remove the attach descriptor vma.
 245  * free memory for segment if it is marked destroyed.
 246  * The descriptor has already been removed from the current->mm->mmap list
 247  * and will later be kfree()d.
 248  */
 249 static void shm_close(struct vm_area_struct *vma)
 250 {
 251         struct file * file = vma->vm_file;
 252         struct shm_file_data *sfd = shm_file_data(file);
 253         struct shmid_kernel *shp;
 254         struct ipc_namespace *ns = sfd->ns;
 255
 256         down_write(&shm_ids(ns).rwsem);
 257         /* remove from the list of attaches of the shm segment */
 258         shp = shm_lock(ns, sfd->id);
 259         BUG_ON(IS_ERR(shp));
 260         shp->shm_lprid = task_tgid_vnr(current);
 261         shp->shm_dtim = get_seconds();
 262         shp->shm_nattch--;
 263         if (shm_may_destroy(ns, shp))
 264                 shm_destroy(ns, shp);
 265         else
 266                 shm_unlock(shp);
 267         up_write(&shm_ids(ns).rwsem);
 268 }
 269
 270 /* Called with ns->shm_ids(ns).rwsem locked */
 271 static int shm_try_destroy_current(int id, void *p, void *data)
 272 {
 273         struct ipc_namespace *ns = data;
 274         struct kern_ipc_perm *ipcp = p;
 275         struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 276
 277         if (shp->shm_creator != current)
 278                 return 0;
 279
 280         /*
 281          * Mark it as orphaned to destroy the segment when
 282          * kernel.shm_rmid_forced is changed.
 283          * It is noop if the following shm_may_destroy() returns true.
 284          */
 285         shp->shm_creator = NULL;
 286
 287         /*
 288          * Don't even try to destroy it.  If shm_rmid_forced=0 and IPC_RMID
 289          * is not set, it shouldn't be deleted here.
 290          */
 291         if (!ns->shm_rmid_forced)
 292                 return 0;
 293
 294         if (shm_may_destroy(ns, shp)) {
 295                 shm_lock_by_ptr(shp);
 296                 shm_destroy(ns, shp);
 297         }
 298         return 0;
 299 }
 300
 301 /* Called with ns->shm_ids(ns).rwsem locked */
 302 static int shm_try_destroy_orphaned(int id, void *p, void *data)
 303 {
 304         struct ipc_namespace *ns = data;
 305         struct kern_ipc_perm *ipcp = p;
 306         struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 307
 308         /*
 309          * We want to destroy segments without users and with already
 310          * exit'ed originating process.
 311          *
 312          * As shp->* are changed under rwsem, it's safe to skip shp locking.
 313          */
 314         if (shp->shm_creator != NULL)
 315                 return 0;
 316
 317         if (shm_may_destroy(ns, shp)) {
 318                 shm_lock_by_ptr(shp);
 319                 shm_destroy(ns, shp);
 320         }
 321         return 0;
 322 }
 323
 324 void shm_destroy_orphaned(struct ipc_namespace *ns)
 325 {
 326         down_write(&shm_ids(ns).rwsem);
 327         if (shm_ids(ns).in_use)
 328                 idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);
 329         up_write(&shm_ids(ns).rwsem);
 330 }
 331
 332
 333 void exit_shm(struct task_struct *task)
 334 {
 335         struct ipc_namespace *ns = task->nsproxy->ipc_ns;
 336
 337         if (shm_ids(ns).in_use == 0)
 338                 return;
 339
 340         /* Destroy all already created segments, but not mapped yet */
 341         down_write(&shm_ids(ns).rwsem);
 342         if (shm_ids(ns).in_use)
 343                 idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_current, ns);
 344         up_write(&shm_ids(ns).rwsem);
 345 }
 346
 347 static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 348 {
 349         struct file *file = vma->vm_file;
 350         struct shm_file_data *sfd = shm_file_data(file);
 351
 352         return sfd->vm_ops->fault(vma, vmf);
 353 }
 354
 355 #ifdef CONFIG_NUMA
 356 static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
 357 {
 358         struct file *file = vma->vm_file;
 359         struct shm_file_data *sfd = shm_file_data(file);
 360         int err = 0;
 361         if (sfd->vm_ops->set_policy)
 362                 err = sfd->vm_ops->set_policy(vma, new);
 363         return err;
 364 }
 365
 366 static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
 367                                         unsigned long addr)
 368 {
 369         struct file *file = vma->vm_file;
 370         struct shm_file_data *sfd = shm_file_data(file);
 371         struct mempolicy *pol = NULL;
 372
 373         if (sfd->vm_ops->get_policy)
 374                 pol = sfd->vm_ops->get_policy(vma, addr);
 375         else if (vma->vm_policy)
 376                 pol = vma->vm_policy;
 377
 378         return pol;
 379 }
 380 #endif
 381
 382 static int shm_mmap(struct file * file, struct vm_area_struct * vma)
 383 {
 384         struct shm_file_data *sfd = shm_file_data(file);
 385         int ret;
 386
 387         ret = sfd->file->f_op->mmap(sfd->file, vma);
 388         if (ret != 0)
 389                 return ret;
 390         sfd->vm_ops = vma->vm_ops;
 391 #ifdef CONFIG_MMU
 392         BUG_ON(!sfd->vm_ops->fault);
 393 #endif
 394         vma->vm_ops = &shm_vm_ops;
 395         shm_open(vma);
 396
 397         return ret;
 398 }
 399
 400 static int shm_release(struct inode *ino, struct file *file)
 401 {
 402         struct shm_file_data *sfd = shm_file_data(file);
 403
 404         put_ipc_ns(sfd->ns);
 405         shm_file_data(file) = NULL;
 406         kfree(sfd);
 407         return 0;
 408 }
 409
 410 static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 411 {
 412         struct shm_file_data *sfd = shm_file_data(file);
 413
 414         if (!sfd->file->f_op->fsync)
 415                 return -EINVAL;
 416         return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
 417 }
 418
 419 static long shm_fallocate(struct file *file, int mode, loff_t offset,
 420                           loff_t len)
 421 {
 422         struct shm_file_data *sfd = shm_file_data(file);
 423
 424         if (!sfd->file->f_op->fallocate)
 425                 return -EOPNOTSUPP;
 426         return sfd->file->f_op->fallocate(file, mode, offset, len);
 427 }
 428
 429 static unsigned long shm_get_unmapped_area(struct file *file,
 430         unsigned long addr, unsigned long len, unsigned long pgoff,
 431         unsigned long flags)
 432 {
 433         struct shm_file_data *sfd = shm_file_data(file);
 434         return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
 435                                                 pgoff, flags);
 436 }
 437
 438 static const struct file_operations shm_file_operations = {
 439         .mmap           = shm_mmap,
 440         .fsync          = shm_fsync,
 441         .release        = shm_release,
 442 #ifndef CONFIG_MMU
 443         .get_unmapped_area      = shm_get_unmapped_area,
 444 #endif
 445         .llseek         = noop_llseek,
 446         .fallocate      = shm_fallocate,
 447 };
 448
 449 static const struct file_operations shm_file_operations_huge = {
 450         .mmap           = shm_mmap,
 451         .fsync          = shm_fsync,
 452         .release        = shm_release,
 453         .get_unmapped_area      = shm_get_unmapped_area,
 454         .llseek         = noop_llseek,
 455         .fallocate      = shm_fallocate,
 456 };
 457
 458 int is_file_shm_hugepages(struct file *file)
 459 {
 460         return file->f_op == &shm_file_operations_huge;
 461 }
 462
 463 static const struct vm_operations_struct shm_vm_ops = {
 464         .open   = shm_open,     /* callback for a new vm-area open */
 465         .close  = shm_close,    /* callback for when the vm-area is released */
 466         .fault  = shm_fault,
 467 #if defined(CONFIG_NUMA)
 468         .set_policy = shm_set_policy,
 469         .get_policy = shm_get_policy,
 470 #endif
 471 };
 472
 473 /**
 474  * newseg - Create a new shared memory segment
 475  * @ns: namespace
 476  * @params: ptr to the structure that contains key, size and shmflg
 477  *
 478  * Called with shm_ids.rwsem held as a writer.
 479  */
 480
 481 static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 482 {
 483         key_t key = params->key;
 484         int shmflg = params->flg;
 485         size_t size = params->u.size;
 486         int error;
 487         struct shmid_kernel *shp;
 488         size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 489         struct file * file;
 490         char name[13];
 491         int id;
 492         vm_flags_t acctflag = 0;
 493
 494         if (size < SHMMIN || size > ns->shm_ctlmax)
 495                 return -EINVAL;
 496
 497         if (ns->shm_tot + numpages > ns->shm_ctlall)
 498                 return -ENOSPC;
 499
 500         shp = ipc_rcu_alloc(sizeof(*shp));
 501         if (!shp)
 502                 return -ENOMEM;
 503
 504         shp->shm_perm.key = key;
 505         shp->shm_perm.mode = (shmflg & S_IRWXUGO);
 506         shp->mlock_user = NULL;
 507
 508         shp->shm_perm.security = NULL;
 509         error = security_shm_alloc(shp);
 510         if (error) {
 511                 ipc_rcu_putref(shp, ipc_rcu_free);
 512                 return error;
 513         }
 514
 515         sprintf (name, "SYSV%08x", key);
 516         if (shmflg & SHM_HUGETLB) {
 517                 struct hstate *hs;
 518                 size_t hugesize;
 519
 520                 hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 521                 if (!hs) {
 522                         error = -EINVAL;
 523                         goto no_file;
 524                 }
 525                 hugesize = ALIGN(size, huge_page_size(hs));
 526
 527                 /* hugetlb_file_setup applies strict accounting */
 528                 if (shmflg & SHM_NORESERVE)
 529                         acctflag = VM_NORESERVE;
 530                 file = hugetlb_file_setup(name, hugesize, acctflag,
 531                                   &shp->mlock_user, HUGETLB_SHMFS_INODE,
 532                                 (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 533         } else {
 534                 /*
 535                  * Do not allow no accounting for OVERCOMMIT_NEVER, even
 536                  * if it's asked for.
 537                  */
 538                 if  ((shmflg & SHM_NORESERVE) &&
 539                                 sysctl_overcommit_memory != OVERCOMMIT_NEVER)
 540                         acctflag = VM_NORESERVE;
 541                 file = shmem_file_setup(name, size, acctflag);
 542         }
 543         error = PTR_ERR(file);
 544         if (IS_ERR(file))
 545                 goto no_file;
 546
 547         id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
 548         if (id < 0) {
 549                 error = id;
 550                 goto no_id;
 551         }
 552
 553         shp->shm_cprid = task_tgid_vnr(current);
 554         shp->shm_lprid = 0;
 555         shp->shm_atim = shp->shm_dtim = 0;
 556         shp->shm_ctim = get_seconds();
 557         shp->shm_segsz = size;
 558         shp->shm_nattch = 0;
 559         shp->shm_file = file;
 560         shp->shm_creator = current;
 561
 562         /*
 563          * shmid gets reported as "inode#" in /proc/pid/maps.
 564          * proc-ps tools use this. Changing this will break them.
 565          */
 566         file_inode(file)->i_ino = shp->shm_perm.id;
 567
 568         ns->shm_tot += numpages;
 569         error = shp->shm_perm.id;
 570
 571         ipc_unlock_object(&shp->shm_perm);
 572         rcu_read_unlock();
 573         return error;
 574
 575 no_id:
 576         if (is_file_hugepages(file) && shp->mlock_user)
 577                 user_shm_unlock(size, shp->mlock_user);
 578         fput(file);
 579 no_file:
 580         ipc_rcu_putref(shp, shm_rcu_free);
 581         return error;
 582 }
 583
 584 /*
 585  * Called with shm_ids.rwsem and ipcp locked.
 586  */
 587 static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
 588 {
 589         struct shmid_kernel *shp;
 590
 591         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 592         return security_shm_associate(shp, shmflg);
 593 }
 594
 595 /*
 596  * Called with shm_ids.rwsem and ipcp locked.
 597  */
 598 static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
 599                                 struct ipc_params *params)
 600 {
 601         struct shmid_kernel *shp;
 602
 603         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 604         if (shp->shm_segsz < params->u.size)
 605                 return -EINVAL;
 606
 607         return 0;
 608 }
 609
 610 SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
 611 {
 612         struct ipc_namespace *ns;
 613         struct ipc_ops shm_ops;
 614         struct ipc_params shm_params;
 615
 616         ns = current->nsproxy->ipc_ns;
 617
 618         shm_ops.getnew = newseg;
 619         shm_ops.associate = shm_security;
 620         shm_ops.more_checks = shm_more_checks;
 621
 622         shm_params.key = key;
 623         shm_params.flg = shmflg;
 624         shm_params.u.size = size;
 625
 626         return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
 627 }
 628
 629 static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
 630 {
 631         switch(version) {
 632         case IPC_64:
 633                 return copy_to_user(buf, in, sizeof(*in));
 634         case IPC_OLD:
 635             {
 636                 struct shmid_ds out;
 637
 638                 memset(&out, 0, sizeof(out));
 639                 ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
 640                 out.shm_segsz   = in->shm_segsz;
 641                 out.shm_atime   = in->shm_atime;
 642                 out.shm_dtime   = in->shm_dtime;
 643                 out.shm_ctime   = in->shm_ctime;
 644                 out.shm_cpid    = in->shm_cpid;
 645                 out.shm_lpid    = in->shm_lpid;
 646                 out.shm_nattch  = in->shm_nattch;
 647
 648                 return copy_to_user(buf, &out, sizeof(out));
 649             }
 650         default:
 651                 return -EINVAL;
 652         }
 653 }
 654
 655 static inline unsigned long
 656 copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
 657 {
 658         switch(version) {
 659         case IPC_64:
 660                 if (copy_from_user(out, buf, sizeof(*out)))
 661                         return -EFAULT;
 662                 return 0;
 663         case IPC_OLD:
 664             {
 665                 struct shmid_ds tbuf_old;
 666
 667                 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
 668                         return -EFAULT;
 669
 670                 out->shm_perm.uid       = tbuf_old.shm_perm.uid;
 671                 out->shm_perm.gid       = tbuf_old.shm_perm.gid;
 672                 out->shm_perm.mode      = tbuf_old.shm_perm.mode;
 673
 674                 return 0;
 675             }
 676         default:
 677                 return -EINVAL;
 678         }
 679 }
 680
 681 static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
 682 {
 683         switch(version) {
 684         case IPC_64:
 685                 return copy_to_user(buf, in, sizeof(*in));
 686         case IPC_OLD:
 687             {
 688                 struct shminfo out;
 689
 690                 if(in->shmmax > INT_MAX)
 691                         out.shmmax = INT_MAX;
 692                 else
 693                         out.shmmax = (int)in->shmmax;
 694
 695                 out.shmmin      = in->shmmin;
 696                 out.shmmni      = in->shmmni;
 697                 out.shmseg      = in->shmseg;
 698                 out.shmall      = in->shmall;
 699
 700                 return copy_to_user(buf, &out, sizeof(out));
 701             }
 702         default:
 703                 return -EINVAL;
 704         }
 705 }
 706
 707 /*
 708  * Calculate and add used RSS and swap pages of a shm.
 709  * Called with shm_ids.rwsem held as a reader
 710  */
 711 static void shm_add_rss_swap(struct shmid_kernel *shp,
 712         unsigned long *rss_add, unsigned long *swp_add)
 713 {
 714         struct inode *inode;
 715
 716         inode = file_inode(shp->shm_file);
 717
 718         if (is_file_hugepages(shp->shm_file)) {
 719                 struct address_space *mapping = inode->i_mapping;
 720                 struct hstate *h = hstate_file(shp->shm_file);
 721                 *rss_add += pages_per_huge_page(h) * mapping->nrpages;
 722         } else {
 723 #ifdef CONFIG_SHMEM
 724                 struct shmem_inode_info *info = SHMEM_I(inode);
 725                 spin_lock(&info->lock);
 726                 *rss_add += inode->i_mapping->nrpages;
 727                 *swp_add += info->swapped;
 728                 spin_unlock(&info->lock);
 729 #else
 730                 *rss_add += inode->i_mapping->nrpages;
 731 #endif
 732         }
 733 }
 734
 735 /*
 736  * Called with shm_ids.rwsem held as a reader
 737  */
 738 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
 739                 unsigned long *swp)
 740 {
 741         int next_id;
 742         int total, in_use;
 743
 744         *rss = 0;
 745         *swp = 0;
 746
 747         in_use = shm_ids(ns).in_use;
 748
 749         for (total = 0, next_id = 0; total < in_use; next_id++) {
 750                 struct kern_ipc_perm *ipc;
 751                 struct shmid_kernel *shp;
 752
 753                 ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
 754                 if (ipc == NULL)
 755                         continue;
 756                 shp = container_of(ipc, struct shmid_kernel, shm_perm);
 757
 758                 shm_add_rss_swap(shp, rss, swp);
 759
 760                 total++;
 761         }
 762 }
 763
 764 /*
 765  * This function handles some shmctl commands which require the rwsem
 766  * to be held in write mode.
 767  * NOTE: no locks must be held, the rwsem is taken inside this function.
 768  */
 769 static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
 770                        struct shmid_ds __user *buf, int version)
 771 {
 772         struct kern_ipc_perm *ipcp;
 773         struct shmid64_ds shmid64;
 774         struct shmid_kernel *shp;
 775         int err;
 776
 777         if (cmd == IPC_SET) {
 778                 if (copy_shmid_from_user(&shmid64, buf, version))
 779                         return -EFAULT;
 780         }
 781
 782         down_write(&shm_ids(ns).rwsem);
 783         rcu_read_lock();
 784
 785         ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd,
 786                                       &shmid64.shm_perm, 0);
 787         if (IS_ERR(ipcp)) {
 788                 err = PTR_ERR(ipcp);
 789                 goto out_unlock1;
 790         }
 791
 792         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 793
 794         err = security_shm_shmctl(shp, cmd);
 795         if (err)
 796                 goto out_unlock1;
 797
 798         switch (cmd) {
 799         case IPC_RMID:
 800                 ipc_lock_object(&shp->shm_perm);
 801                 /* do_shm_rmid unlocks the ipc object and rcu */
 802                 do_shm_rmid(ns, ipcp);
 803                 goto out_up;
 804         case IPC_SET:
 805                 ipc_lock_object(&shp->shm_perm);
 806                 err = ipc_update_perm(&shmid64.shm_perm, ipcp);
 807                 if (err)
 808                         goto out_unlock0;
 809                 shp->shm_ctim = get_seconds();
 810                 break;
 811         default:
 812                 err = -EINVAL;
 813                 goto out_unlock1;
 814         }
 815
 816 out_unlock0:
 817         ipc_unlock_object(&shp->shm_perm);
 818 out_unlock1:
 819         rcu_read_unlock();
 820 out_up:
 821         up_write(&shm_ids(ns).rwsem);
 822         return err;
 823 }
 824
 825 static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
 826                          int cmd, int version, void __user *buf)
 827 {
 828         int err;
 829         struct shmid_kernel *shp;
 830
 831         /* preliminary security checks for *_INFO */
 832         if (cmd == IPC_INFO || cmd == SHM_INFO) {
 833                 err = security_shm_shmctl(NULL, cmd);
 834                 if (err)
 835                         return err;
 836         }
 837
 838         switch (cmd) {
 839         case IPC_INFO:
 840         {
 841                 struct shminfo64 shminfo;
 842
 843                 memset(&shminfo, 0, sizeof(shminfo));
 844                 shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
 845                 shminfo.shmmax = ns->shm_ctlmax;
 846                 shminfo.shmall = ns->shm_ctlall;
 847
 848                 shminfo.shmmin = SHMMIN;
 849                 if(copy_shminfo_to_user (buf, &shminfo, version))
 850                         return -EFAULT;
 851
 852                 down_read(&shm_ids(ns).rwsem);
 853                 err = ipc_get_maxid(&shm_ids(ns));
 854                 up_read(&shm_ids(ns).rwsem);
 855
 856                 if(err<0)
 857                         err = 0;
 858                 goto out;
 859         }
 860         case SHM_INFO:
 861         {
 862                 struct shm_info shm_info;
 863
 864                 memset(&shm_info, 0, sizeof(shm_info));
 865                 down_read(&shm_ids(ns).rwsem);
 866                 shm_info.used_ids = shm_ids(ns).in_use;
 867                 shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
 868                 shm_info.shm_tot = ns->shm_tot;
 869                 shm_info.swap_attempts = 0;
 870                 shm_info.swap_successes = 0;
 871                 err = ipc_get_maxid(&shm_ids(ns));
 872                 up_read(&shm_ids(ns).rwsem);
 873                 if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
 874                         err = -EFAULT;
 875                         goto out;
 876                 }
 877
 878                 err = err < 0 ? 0 : err;
 879                 goto out;
 880         }
 881         case SHM_STAT:
 882         case IPC_STAT:
 883         {
 884                 struct shmid64_ds tbuf;
 885                 int result;
 886
 887                 rcu_read_lock();
 888                 if (cmd == SHM_STAT) {
 889                         shp = shm_obtain_object(ns, shmid);
 890                         if (IS_ERR(shp)) {
 891                                 err = PTR_ERR(shp);
 892                                 goto out_unlock;
 893                         }
 894                         result = shp->shm_perm.id;
 895                 } else {
 896                         shp = shm_obtain_object_check(ns, shmid);
 897                         if (IS_ERR(shp)) {
 898                                 err = PTR_ERR(shp);
 899                                 goto out_unlock;
 900                         }
 901                         result = 0;
 902                 }
 903
 904                 err = -EACCES;
 905                 if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
 906                         goto out_unlock;
 907
 908                 err = security_shm_shmctl(shp, cmd);
 909                 if (err)
 910                         goto out_unlock;
 911
 912                 memset(&tbuf, 0, sizeof(tbuf));
 913                 kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
 914                 tbuf.shm_segsz  = shp->shm_segsz;
 915                 tbuf.shm_atime  = shp->shm_atim;
 916                 tbuf.shm_dtime  = shp->shm_dtim;
 917                 tbuf.shm_ctime  = shp->shm_ctim;
 918                 tbuf.shm_cpid   = shp->shm_cprid;
 919                 tbuf.shm_lpid   = shp->shm_lprid;
 920                 tbuf.shm_nattch = shp->shm_nattch;
 921                 rcu_read_unlock();
 922
 923                 if (copy_shmid_to_user(buf, &tbuf, version))
 924                         err = -EFAULT;
 925                 else
 926                         err = result;
 927                 goto out;
 928         }
 929         default:
 930                 return -EINVAL;
 931         }
 932
 933 out_unlock:
 934         rcu_read_unlock();
 935 out:
 936         return err;
 937 }
 938
 939 SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
 940 {
 941         struct shmid_kernel *shp;
 942         int err, version;
 943         struct ipc_namespace *ns;
 944
 945         if (cmd < 0 || shmid < 0)
 946                 return -EINVAL;
 947
 948         version = ipc_parse_version(&cmd);
 949         ns = current->nsproxy->ipc_ns;
 950
 951         switch (cmd) {
 952         case IPC_INFO:
 953         case SHM_INFO:
 954         case SHM_STAT:
 955         case IPC_STAT:
 956                 return shmctl_nolock(ns, shmid, cmd, version, buf);
 957         case IPC_RMID:
 958         case IPC_SET:
 959                 return shmctl_down(ns, shmid, cmd, buf, version);
 960         case SHM_LOCK:
 961         case SHM_UNLOCK:
 962         {
 963                 struct file *shm_file;
 964
 965                 rcu_read_lock();
 966                 shp = shm_obtain_object_check(ns, shmid);
 967                 if (IS_ERR(shp)) {
 968                         err = PTR_ERR(shp);
 969                         goto out_unlock1;
 970                 }
 971
 972                 audit_ipc_obj(&(shp->shm_perm));
 973                 err = security_shm_shmctl(shp, cmd);
 974                 if (err)
 975                         goto out_unlock1;
 976
 977                 ipc_lock_object(&shp->shm_perm);
 978                 if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
 979                         kuid_t euid = current_euid();
 980                         if (!uid_eq(euid, shp->shm_perm.uid) &&
 981                             !uid_eq(euid, shp->shm_perm.cuid)) {
 982                                 err = -EPERM;
 983                                 goto out_unlock0;
 984                         }
 985                         if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) {
 986                                 err = -EPERM;
 987                                 goto out_unlock0;
 988                         }
 989                 }
 990
 991                 shm_file = shp->shm_file;
 992
 993                 /* check if shm_destroy() is tearing down shp */
 994                 if (shm_file == NULL) {
 995                         err = -EIDRM;
 996                         goto out_unlock0;
 997                 }
 998
 999                 if (is_file_hugepages(shm_file))
1000                         goto out_unlock0;
1001
1002                 if (cmd == SHM_LOCK) {
1003                         struct user_struct *user = current_user();
1004                         err = shmem_lock(shm_file, 1, user);
1005                         if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
1006                                 shp->shm_perm.mode |= SHM_LOCKED;
1007                                 shp->mlock_user = user;
1008                         }
1009                         goto out_unlock0;
1010                 }
1011
1012                 /* SHM_UNLOCK */
1013                 if (!(shp->shm_perm.mode & SHM_LOCKED))
1014                         goto out_unlock0;
1015                 shmem_lock(shm_file, 0, shp->mlock_user);
1016                 shp->shm_perm.mode &= ~SHM_LOCKED;
1017                 shp->mlock_user = NULL;
1018                 get_file(shm_file);
1019                 ipc_unlock_object(&shp->shm_perm);
1020                 rcu_read_unlock();
1021                 shmem_unlock_mapping(shm_file->f_mapping);
1022
1023                 fput(shm_file);
1024                 return err;
1025         }
1026         default:
1027                 return -EINVAL;
1028         }
1029
1030 out_unlock0:
1031         ipc_unlock_object(&shp->shm_perm);
1032 out_unlock1:
1033         rcu_read_unlock();
1034         return err;
1035 }
1036
1037 /*
1038  * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
1039  *
1040  * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
1041  * "raddr" thing points to kernel space, and there has to be a wrapper around
1042  * this.
1043  */
1044 long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
1045               unsigned long shmlba)
1046 {
1047         struct shmid_kernel *shp;
1048         unsigned long addr;
1049         unsigned long size;
1050         struct file * file;
1051         int    err;
1052         unsigned long flags;
1053         unsigned long prot;
1054         int acc_mode;
1055         struct ipc_namespace *ns;
1056         struct shm_file_data *sfd;
1057         struct path path;
1058         fmode_t f_mode;
1059         unsigned long populate = 0;
1060
1061         err = -EINVAL;
1062         if (shmid < 0)
1063                 goto out;
1064         else if ((addr = (ulong)shmaddr)) {
1065                 if (addr & (shmlba - 1)) {
1066                         if (shmflg & SHM_RND)
1067                                 addr &= ~(shmlba - 1);     /* round down */
1068                         else
1069 #ifndef __ARCH_FORCE_SHMLBA
1070                                 if (addr & ~PAGE_MASK)
1071 #endif
1072                                         goto out;
1073                 }
1074                 flags = MAP_SHARED | MAP_FIXED;
1075         } else {
1076                 if ((shmflg & SHM_REMAP))
1077                         goto out;
1078
1079                 flags = MAP_SHARED;
1080         }
1081
1082         if (shmflg & SHM_RDONLY) {
1083                 prot = PROT_READ;
1084                 acc_mode = S_IRUGO;
1085                 f_mode = FMODE_READ;
1086         } else {
1087                 prot = PROT_READ | PROT_WRITE;
1088                 acc_mode = S_IRUGO | S_IWUGO;
1089                 f_mode = FMODE_READ | FMODE_WRITE;
1090         }
1091         if (shmflg & SHM_EXEC) {
1092                 prot |= PROT_EXEC;
1093                 acc_mode |= S_IXUGO;
1094         }
1095
1096         /*
1097          * We cannot rely on the fs check since SYSV IPC does have an
1098          * additional creator id...
1099          */
1100         ns = current->nsproxy->ipc_ns;
1101         rcu_read_lock();
1102         shp = shm_obtain_object_check(ns, shmid);
1103         if (IS_ERR(shp)) {
1104                 err = PTR_ERR(shp);
1105                 goto out_unlock;
1106         }
1107
1108         err = -EACCES;
1109         if (ipcperms(ns, &shp->shm_perm, acc_mode))
1110                 goto out_unlock;
1111
1112         err = security_shm_shmat(shp, shmaddr, shmflg);
1113         if (err)
1114                 goto out_unlock;
1115
1116         ipc_lock_object(&shp->shm_perm);
1117
1118         /* check if shm_destroy() is tearing down shp */
1119         if (shp->shm_file == NULL) {
1120                 ipc_unlock_object(&shp->shm_perm);
1121                 err = -EIDRM;
1122                 goto out_unlock;
1123         }
1124
1125         path = shp->shm_file->f_path;
1126         path_get(&path);
1127         shp->shm_nattch++;
1128         size = i_size_read(path.dentry->d_inode);
1129         ipc_unlock_object(&shp->shm_perm);
1130         rcu_read_unlock();
1131
1132         err = -ENOMEM;
1133         sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
1134         if (!sfd) {
1135                 path_put(&path);
1136                 goto out_nattch;
1137         }
1138
1139         file = alloc_file(&path, f_mode,
1140                           is_file_hugepages(shp->shm_file) ?
1141                                 &shm_file_operations_huge :
1142                                 &shm_file_operations);
1143         err = PTR_ERR(file);
1144         if (IS_ERR(file)) {
1145                 kfree(sfd);
1146                 path_put(&path);
1147                 goto out_nattch;
1148         }
1149
1150         file->private_data = sfd;
1151         file->f_mapping = shp->shm_file->f_mapping;
1152         sfd->id = shp->shm_perm.id;
1153         sfd->ns = get_ipc_ns(ns);
1154         sfd->file = shp->shm_file;
1155         sfd->vm_ops = NULL;
1156
1157         err = security_mmap_file(file, prot, flags);
1158         if (err)
1159                 goto out_fput;
1160
1161         down_write(&current->mm->mmap_sem);
1162         if (addr && !(shmflg & SHM_REMAP)) {
1163                 err = -EINVAL;
1164                 if (find_vma_intersection(current->mm, addr, addr + size))
1165                         goto invalid;
1166                 /*
1167                  * If shm segment goes below stack, make sure there is some
1168                  * space left for the stack to grow (at least 4 pages).
1169                  */
1170                 if (addr < current->mm->start_stack &&
1171                     addr > current->mm->start_stack - size - PAGE_SIZE * 5)
1172                         goto invalid;
1173         }
1174
1175         addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate);
1176         *raddr = addr;
1177         err = 0;
1178         if (IS_ERR_VALUE(addr))
1179                 err = (long)addr;
1180 invalid:
1181         up_write(&current->mm->mmap_sem);
1182         if (populate)
1183                 mm_populate(addr, populate);
1184
1185 out_fput:
1186         fput(file);
1187
1188 out_nattch:
1189         down_write(&shm_ids(ns).rwsem);
1190         shp = shm_lock(ns, shmid);
1191         BUG_ON(IS_ERR(shp));
1192         shp->shm_nattch--;
1193         if (shm_may_destroy(ns, shp))
1194                 shm_destroy(ns, shp);
1195         else
1196                 shm_unlock(shp);
1197         up_write(&shm_ids(ns).rwsem);
1198         return err;
1199
1200 out_unlock:
1201         rcu_read_unlock();
1202 out:
1203         return err;
1204 }
1205
1206 SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
1207 {
1208         unsigned long ret;
1209         long err;
1210
1211         err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
1212         if (err)
1213                 return err;
1214         force_successful_syscall_return();
1215         return (long)ret;
1216 }
1217
1218 /*
1219  * detach and kill segment if marked destroyed.
1220  * The work is done in shm_close.
1221  */
1222 SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
1223 {
1224         struct mm_struct *mm = current->mm;
1225         struct vm_area_struct *vma;
1226         unsigned long addr = (unsigned long)shmaddr;
1227         int retval = -EINVAL;
1228 #ifdef CONFIG_MMU
1229         loff_t size = 0;
1230         struct vm_area_struct *next;
1231 #endif
1232
1233         if (addr & ~PAGE_MASK)
1234                 return retval;
1235
1236         down_write(&mm->mmap_sem);
1237
1238         /*
1239          * This function tries to be smart and unmap shm segments that
1240          * were modified by partial mlock or munmap calls:
1241          * - It first determines the size of the shm segment that should be
1242          *   unmapped: It searches for a vma that is backed by shm and that
1243          *   started at address shmaddr. It records it's size and then unmaps
1244          *   it.
1245          * - Then it unmaps all shm vmas that started at shmaddr and that
1246          *   are within the initially determined size.
1247          * Errors from do_munmap are ignored: the function only fails if
1248          * it's called with invalid parameters or if it's called to unmap
1249          * a part of a vma. Both calls in this function are for full vmas,
1250          * the parameters are directly copied from the vma itself and always
1251          * valid - therefore do_munmap cannot fail. (famous last words?)
1252          */
1253         /*
1254          * If it had been mremap()'d, the starting address would not
1255          * match the usual checks anyway. So assume all vma's are
1256          * above the starting address given.
1257          */
1258         vma = find_vma(mm, addr);
1259
1260 #ifdef CONFIG_MMU
1261         while (vma) {
1262                 next = vma->vm_next;
1263
1264                 /*
1265                  * Check if the starting address would match, i.e. it's
1266                  * a fragment created by mprotect() and/or munmap(), or it
1267                  * otherwise it starts at this address with no hassles.
1268                  */
1269                 if ((vma->vm_ops == &shm_vm_ops) &&
1270                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
1271
1272
1273                         size = file_inode(vma->vm_file)->i_size;
1274                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1275                         /*
1276                          * We discovered the size of the shm segment, so
1277                          * break out of here and fall through to the next
1278                          * loop that uses the size information to stop
1279                          * searching for matching vma's.
1280                          */
1281                         retval = 0;
1282                         vma = next;
1283                         break;
1284                 }
1285                 vma = next;
1286         }
1287
1288         /*
1289          * We need look no further than the maximum address a fragment
1290          * could possibly have landed at. Also cast things to loff_t to
1291          * prevent overflows and make comparisons vs. equal-width types.
1292          */
1293         size = PAGE_ALIGN(size);
1294         while (vma && (loff_t)(vma->vm_end - addr) <= size) {
1295                 next = vma->vm_next;
1296
1297                 /* finding a matching vma now does not alter retval */
1298                 if ((vma->vm_ops == &shm_vm_ops) &&
1299                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff)
1300
1301                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1302                 vma = next;
1303         }
1304
1305 #else /* CONFIG_MMU */
1306         /* under NOMMU conditions, the exact address to be destroyed must be
1307          * given */
1308         if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
1309                 do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1310                 retval = 0;
1311         }
1312
1313 #endif
1314
1315         up_write(&mm->mmap_sem);
1316         return retval;
1317 }
1318
1319 #ifdef CONFIG_PROC_FS
1320 static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
1321 {
1322         struct user_namespace *user_ns = seq_user_ns(s);
1323         struct shmid_kernel *shp = it;
1324         unsigned long rss = 0, swp = 0;
1325
1326         shm_add_rss_swap(shp, &rss, &swp);
1327
1328 #if BITS_PER_LONG <= 32
1329 #define SIZE_SPEC "%10lu"
1330 #else
1331 #define SIZE_SPEC "%21lu"
1332 #endif
1333
1334         return seq_printf(s,
1335                           "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
1336                           "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
1337                           SIZE_SPEC " " SIZE_SPEC "\n",
1338                           shp->shm_perm.key,
1339                           shp->shm_perm.id,
1340                           shp->shm_perm.mode,
1341                           shp->shm_segsz,
1342                           shp->shm_cprid,
1343                           shp->shm_lprid,
1344                           shp->shm_nattch,
1345                           from_kuid_munged(user_ns, shp->shm_perm.uid),
1346                           from_kgid_munged(user_ns, shp->shm_perm.gid),
1347                           from_kuid_munged(user_ns, shp->shm_perm.cuid),
1348                           from_kgid_munged(user_ns, shp->shm_perm.cgid),
1349                           shp->shm_atim,
1350                           shp->shm_dtim,
1351                           shp->shm_ctim,
1352                           rss * PAGE_SIZE,
1353                           swp * PAGE_SIZE);
1354 }
1355 #endif