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.rw_mutex (writer) and the shp structure locked.
  87  * Only shm_ids.rw_mutex 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 rw_mutex
 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 struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns,
 171                                                 int id)
 172 {
 173         struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id);
 174
 175         if (IS_ERR(ipcp))
 176                 return (struct shmid_kernel *)ipcp;
 177
 178         return container_of(ipcp, struct shmid_kernel, shm_perm);
 179 }
 180
 181 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
 182 {
 183         ipc_rmid(&shm_ids(ns), &s->shm_perm);
 184 }
 185
 186
 187 /* This is called by fork, once for every shm attach. */
 188 static void shm_open(struct vm_area_struct *vma)
 189 {
 190         struct file *file = vma->vm_file;
 191         struct shm_file_data *sfd = shm_file_data(file);
 192         struct shmid_kernel *shp;
 193
 194         shp = shm_lock(sfd->ns, sfd->id);
 195         BUG_ON(IS_ERR(shp));
 196         shp->shm_atim = get_seconds();
 197         shp->shm_lprid = task_tgid_vnr(current);
 198         shp->shm_nattch++;
 199         shm_unlock(shp);
 200 }
 201
 202 /*
 203  * shm_destroy - free the struct shmid_kernel
 204  *
 205  * @ns: namespace
 206  * @shp: struct to free
 207  *
 208  * It has to be called with shp and shm_ids.rw_mutex (writer) locked,
 209  * but returns with shp unlocked and freed.
 210  */
 211 static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
 212 {
 213         ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
 214         shm_rmid(ns, shp);
 215         shm_unlock(shp);
 216         if (!is_file_hugepages(shp->shm_file))
 217                 shmem_lock(shp->shm_file, 0, shp->mlock_user);
 218         else if (shp->mlock_user)
 219                 user_shm_unlock(file_inode(shp->shm_file)->i_size,
 220                                                 shp->mlock_user);
 221         fput (shp->shm_file);
 222         security_shm_free(shp);
 223         ipc_rcu_putref(shp);
 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).rw_mutex);
 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).rw_mutex);
 268 }
 269
 270 /* Called with ns->shm_ids(ns).rw_mutex 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).rw_mutex 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 rw_mutex, 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).rw_mutex);
 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).rw_mutex);
 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).rw_mutex);
 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).rw_mutex);
 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.rw_mutex 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);
 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         security_shm_free(shp);
 581         ipc_rcu_putref(shp);
 582         return error;
 583 }
 584
 585 /*
 586  * Called with shm_ids.rw_mutex and ipcp locked.
 587  */
 588 static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
 589 {
 590         struct shmid_kernel *shp;
 591
 592         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 593         return security_shm_associate(shp, shmflg);
 594 }
 595
 596 /*
 597  * Called with shm_ids.rw_mutex and ipcp locked.
 598  */
 599 static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
 600                                 struct ipc_params *params)
 601 {
 602         struct shmid_kernel *shp;
 603
 604         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 605         if (shp->shm_segsz < params->u.size)
 606                 return -EINVAL;
 607
 608         return 0;
 609 }
 610
 611 SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
 612 {
 613         struct ipc_namespace *ns;
 614         struct ipc_ops shm_ops;
 615         struct ipc_params shm_params;
 616
 617         ns = current->nsproxy->ipc_ns;
 618
 619         shm_ops.getnew = newseg;
 620         shm_ops.associate = shm_security;
 621         shm_ops.more_checks = shm_more_checks;
 622
 623         shm_params.key = key;
 624         shm_params.flg = shmflg;
 625         shm_params.u.size = size;
 626
 627         return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
 628 }
 629
 630 static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
 631 {
 632         switch(version) {
 633         case IPC_64:
 634                 return copy_to_user(buf, in, sizeof(*in));
 635         case IPC_OLD:
 636             {
 637                 struct shmid_ds out;
 638
 639                 memset(&out, 0, sizeof(out));
 640                 ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
 641                 out.shm_segsz   = in->shm_segsz;
 642                 out.shm_atime   = in->shm_atime;
 643                 out.shm_dtime   = in->shm_dtime;
 644                 out.shm_ctime   = in->shm_ctime;
 645                 out.shm_cpid    = in->shm_cpid;
 646                 out.shm_lpid    = in->shm_lpid;
 647                 out.shm_nattch  = in->shm_nattch;
 648
 649                 return copy_to_user(buf, &out, sizeof(out));
 650             }
 651         default:
 652                 return -EINVAL;
 653         }
 654 }
 655
 656 static inline unsigned long
 657 copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
 658 {
 659         switch(version) {
 660         case IPC_64:
 661                 if (copy_from_user(out, buf, sizeof(*out)))
 662                         return -EFAULT;
 663                 return 0;
 664         case IPC_OLD:
 665             {
 666                 struct shmid_ds tbuf_old;
 667
 668                 if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
 669                         return -EFAULT;
 670
 671                 out->shm_perm.uid       = tbuf_old.shm_perm.uid;
 672                 out->shm_perm.gid       = tbuf_old.shm_perm.gid;
 673                 out->shm_perm.mode      = tbuf_old.shm_perm.mode;
 674
 675                 return 0;
 676             }
 677         default:
 678                 return -EINVAL;
 679         }
 680 }
 681
 682 static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
 683 {
 684         switch(version) {
 685         case IPC_64:
 686                 return copy_to_user(buf, in, sizeof(*in));
 687         case IPC_OLD:
 688             {
 689                 struct shminfo out;
 690
 691                 if(in->shmmax > INT_MAX)
 692                         out.shmmax = INT_MAX;
 693                 else
 694                         out.shmmax = (int)in->shmmax;
 695
 696                 out.shmmin      = in->shmmin;
 697                 out.shmmni      = in->shmmni;
 698                 out.shmseg      = in->shmseg;
 699                 out.shmall      = in->shmall;
 700
 701                 return copy_to_user(buf, &out, sizeof(out));
 702             }
 703         default:
 704                 return -EINVAL;
 705         }
 706 }
 707
 708 /*
 709  * Calculate and add used RSS and swap pages of a shm.
 710  * Called with shm_ids.rw_mutex held as a reader
 711  */
 712 static void shm_add_rss_swap(struct shmid_kernel *shp,
 713         unsigned long *rss_add, unsigned long *swp_add)
 714 {
 715         struct inode *inode;
 716
 717         inode = file_inode(shp->shm_file);
 718
 719         if (is_file_hugepages(shp->shm_file)) {
 720                 struct address_space *mapping = inode->i_mapping;
 721                 struct hstate *h = hstate_file(shp->shm_file);
 722                 *rss_add += pages_per_huge_page(h) * mapping->nrpages;
 723         } else {
 724 #ifdef CONFIG_SHMEM
 725                 struct shmem_inode_info *info = SHMEM_I(inode);
 726                 spin_lock(&info->lock);
 727                 *rss_add += inode->i_mapping->nrpages;
 728                 *swp_add += info->swapped;
 729                 spin_unlock(&info->lock);
 730 #else
 731                 *rss_add += inode->i_mapping->nrpages;
 732 #endif
 733         }
 734 }
 735
 736 /*
 737  * Called with shm_ids.rw_mutex held as a reader
 738  */
 739 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
 740                 unsigned long *swp)
 741 {
 742         int next_id;
 743         int total, in_use;
 744
 745         *rss = 0;
 746         *swp = 0;
 747
 748         in_use = shm_ids(ns).in_use;
 749
 750         for (total = 0, next_id = 0; total < in_use; next_id++) {
 751                 struct kern_ipc_perm *ipc;
 752                 struct shmid_kernel *shp;
 753
 754                 ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
 755                 if (ipc == NULL)
 756                         continue;
 757                 shp = container_of(ipc, struct shmid_kernel, shm_perm);
 758
 759                 shm_add_rss_swap(shp, rss, swp);
 760
 761                 total++;
 762         }
 763 }
 764
 765 /*
 766  * This function handles some shmctl commands which require the rw_mutex
 767  * to be held in write mode.
 768  * NOTE: no locks must be held, the rw_mutex is taken inside this function.
 769  */
 770 static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
 771                        struct shmid_ds __user *buf, int version)
 772 {
 773         struct kern_ipc_perm *ipcp;
 774         struct shmid64_ds shmid64;
 775         struct shmid_kernel *shp;
 776         int err;
 777
 778         if (cmd == IPC_SET) {
 779                 if (copy_shmid_from_user(&shmid64, buf, version))
 780                         return -EFAULT;
 781         }
 782
 783         down_write(&shm_ids(ns).rw_mutex);
 784         rcu_read_lock();
 785
 786         ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd,
 787                                       &shmid64.shm_perm, 0);
 788         if (IS_ERR(ipcp)) {
 789                 err = PTR_ERR(ipcp);
 790                 goto out_unlock1;
 791         }
 792
 793         shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 794
 795         err = security_shm_shmctl(shp, cmd);
 796         if (err)
 797                 goto out_unlock1;
 798
 799         switch (cmd) {
 800         case IPC_RMID:
 801                 ipc_lock_object(&shp->shm_perm);
 802                 /* do_shm_rmid unlocks the ipc object and rcu */
 803                 do_shm_rmid(ns, ipcp);
 804                 goto out_up;
 805         case IPC_SET:
 806                 ipc_lock_object(&shp->shm_perm);
 807                 err = ipc_update_perm(&shmid64.shm_perm, ipcp);
 808                 if (err)
 809                         goto out_unlock0;
 810                 shp->shm_ctim = get_seconds();
 811                 break;
 812         default:
 813                 err = -EINVAL;
 814                 goto out_unlock1;
 815         }
 816
 817 out_unlock0:
 818         ipc_unlock_object(&shp->shm_perm);
 819 out_unlock1:
 820         rcu_read_unlock();
 821 out_up:
 822         up_write(&shm_ids(ns).rw_mutex);
 823         return err;
 824 }
 825
 826 static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
 827                          int cmd, int version, void __user *buf)
 828 {
 829         int err;
 830         struct shmid_kernel *shp;
 831
 832         /* preliminary security checks for *_INFO */
 833         if (cmd == IPC_INFO || cmd == SHM_INFO) {
 834                 err = security_shm_shmctl(NULL, cmd);
 835                 if (err)
 836                         return err;
 837         }
 838
 839         switch (cmd) {
 840         case IPC_INFO:
 841         {
 842                 struct shminfo64 shminfo;
 843
 844                 memset(&shminfo, 0, sizeof(shminfo));
 845                 shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
 846                 shminfo.shmmax = ns->shm_ctlmax;
 847                 shminfo.shmall = ns->shm_ctlall;
 848
 849                 shminfo.shmmin = SHMMIN;
 850                 if(copy_shminfo_to_user (buf, &shminfo, version))
 851                         return -EFAULT;
 852
 853                 down_read(&shm_ids(ns).rw_mutex);
 854                 err = ipc_get_maxid(&shm_ids(ns));
 855                 up_read(&shm_ids(ns).rw_mutex);
 856
 857                 if(err<0)
 858                         err = 0;
 859                 goto out;
 860         }
 861         case SHM_INFO:
 862         {
 863                 struct shm_info shm_info;
 864
 865                 memset(&shm_info, 0, sizeof(shm_info));
 866                 down_read(&shm_ids(ns).rw_mutex);
 867                 shm_info.used_ids = shm_ids(ns).in_use;
 868                 shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
 869                 shm_info.shm_tot = ns->shm_tot;
 870                 shm_info.swap_attempts = 0;
 871                 shm_info.swap_successes = 0;
 872                 err = ipc_get_maxid(&shm_ids(ns));
 873                 up_read(&shm_ids(ns).rw_mutex);
 874                 if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
 875                         err = -EFAULT;
 876                         goto out;
 877                 }
 878
 879                 err = err < 0 ? 0 : err;
 880                 goto out;
 881         }
 882         case SHM_STAT:
 883         case IPC_STAT:
 884         {
 885                 struct shmid64_ds tbuf;
 886                 int result;
 887
 888                 rcu_read_lock();
 889                 if (cmd == SHM_STAT) {
 890                         shp = shm_obtain_object(ns, shmid);
 891                         if (IS_ERR(shp)) {
 892                                 err = PTR_ERR(shp);
 893                                 goto out_unlock;
 894                         }
 895                         result = shp->shm_perm.id;
 896                 } else {
 897                         shp = shm_obtain_object_check(ns, shmid);
 898                         if (IS_ERR(shp)) {
 899                                 err = PTR_ERR(shp);
 900                                 goto out_unlock;
 901                         }
 902                         result = 0;
 903                 }
 904
 905                 err = -EACCES;
 906                 if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
 907                         goto out_unlock;
 908
 909                 err = security_shm_shmctl(shp, cmd);
 910                 if (err)
 911                         goto out_unlock;
 912
 913                 memset(&tbuf, 0, sizeof(tbuf));
 914                 kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
 915                 tbuf.shm_segsz  = shp->shm_segsz;
 916                 tbuf.shm_atime  = shp->shm_atim;
 917                 tbuf.shm_dtime  = shp->shm_dtim;
 918                 tbuf.shm_ctime  = shp->shm_ctim;
 919                 tbuf.shm_cpid   = shp->shm_cprid;
 920                 tbuf.shm_lpid   = shp->shm_lprid;
 921                 tbuf.shm_nattch = shp->shm_nattch;
 922                 rcu_read_unlock();
 923
 924                 if (copy_shmid_to_user(buf, &tbuf, version))
 925                         err = -EFAULT;
 926                 else
 927                         err = result;
 928                 goto out;
 929         }
 930         default:
 931                 return -EINVAL;
 932         }
 933
 934 out_unlock:
 935         rcu_read_unlock();
 936 out:
 937         return err;
 938 }
 939
 940 SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
 941 {
 942         struct shmid_kernel *shp;
 943         int err, version;
 944         struct ipc_namespace *ns;
 945
 946         if (cmd < 0 || shmid < 0)
 947                 return -EINVAL;
 948
 949         version = ipc_parse_version(&cmd);
 950         ns = current->nsproxy->ipc_ns;
 951
 952         switch (cmd) {
 953         case IPC_INFO:
 954         case SHM_INFO:
 955         case SHM_STAT:
 956         case IPC_STAT:
 957                 return shmctl_nolock(ns, shmid, cmd, version, buf);
 958         case IPC_RMID:
 959         case IPC_SET:
 960                 return shmctl_down(ns, shmid, cmd, buf, version);
 961         case SHM_LOCK:
 962         case SHM_UNLOCK:
 963         {
 964                 struct file *shm_file;
 965
 966                 rcu_read_lock();
 967                 shp = shm_obtain_object_check(ns, shmid);
 968                 if (IS_ERR(shp)) {
 969                         err = PTR_ERR(shp);
 970                         goto out_unlock1;
 971                 }
 972
 973                 audit_ipc_obj(&(shp->shm_perm));
 974                 err = security_shm_shmctl(shp, cmd);
 975                 if (err)
 976                         goto out_unlock1;
 977
 978                 ipc_lock_object(&shp->shm_perm);
 979                 if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
 980                         kuid_t euid = current_euid();
 981                         err = -EPERM;
 982                         if (!uid_eq(euid, shp->shm_perm.uid) &&
 983                             !uid_eq(euid, shp->shm_perm.cuid))
 984                                 goto out_unlock0;
 985                         if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK))
 986                                 goto out_unlock0;
 987                 }
 988
 989                 shm_file = shp->shm_file;
 990                 if (is_file_hugepages(shm_file))
 991                         goto out_unlock0;
 992
 993                 if (cmd == SHM_LOCK) {
 994                         struct user_struct *user = current_user();
 995                         err = shmem_lock(shm_file, 1, user);
 996                         if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
 997                                 shp->shm_perm.mode |= SHM_LOCKED;
 998                                 shp->mlock_user = user;
 999                         }
1000                         goto out_unlock0;
1001                 }
1002
1003                 /* SHM_UNLOCK */
1004                 if (!(shp->shm_perm.mode & SHM_LOCKED))
1005                         goto out_unlock0;
1006                 shmem_lock(shm_file, 0, shp->mlock_user);
1007                 shp->shm_perm.mode &= ~SHM_LOCKED;
1008                 shp->mlock_user = NULL;
1009                 get_file(shm_file);
1010                 ipc_unlock_object(&shp->shm_perm);
1011                 rcu_read_unlock();
1012                 shmem_unlock_mapping(shm_file->f_mapping);
1013
1014                 fput(shm_file);
1015                 return err;
1016         }
1017         default:
1018                 return -EINVAL;
1019         }
1020
1021 out_unlock0:
1022         ipc_unlock_object(&shp->shm_perm);
1023 out_unlock1:
1024         rcu_read_unlock();
1025         return err;
1026 }
1027
1028 /*
1029  * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
1030  *
1031  * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
1032  * "raddr" thing points to kernel space, and there has to be a wrapper around
1033  * this.
1034  */
1035 long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
1036               unsigned long shmlba)
1037 {
1038         struct shmid_kernel *shp;
1039         unsigned long addr;
1040         unsigned long size;
1041         struct file * file;
1042         int    err;
1043         unsigned long flags;
1044         unsigned long prot;
1045         int acc_mode;
1046         struct ipc_namespace *ns;
1047         struct shm_file_data *sfd;
1048         struct path path;
1049         fmode_t f_mode;
1050         unsigned long populate = 0;
1051
1052         err = -EINVAL;
1053         if (shmid < 0)
1054                 goto out;
1055         else if ((addr = (ulong)shmaddr)) {
1056                 if (addr & (shmlba - 1)) {
1057                         if (shmflg & SHM_RND)
1058                                 addr &= ~(shmlba - 1);     /* round down */
1059                         else
1060 #ifndef __ARCH_FORCE_SHMLBA
1061                                 if (addr & ~PAGE_MASK)
1062 #endif
1063                                         goto out;
1064                 }
1065                 flags = MAP_SHARED | MAP_FIXED;
1066         } else {
1067                 if ((shmflg & SHM_REMAP))
1068                         goto out;
1069
1070                 flags = MAP_SHARED;
1071         }
1072
1073         if (shmflg & SHM_RDONLY) {
1074                 prot = PROT_READ;
1075                 acc_mode = S_IRUGO;
1076                 f_mode = FMODE_READ;
1077         } else {
1078                 prot = PROT_READ | PROT_WRITE;
1079                 acc_mode = S_IRUGO | S_IWUGO;
1080                 f_mode = FMODE_READ | FMODE_WRITE;
1081         }
1082         if (shmflg & SHM_EXEC) {
1083                 prot |= PROT_EXEC;
1084                 acc_mode |= S_IXUGO;
1085         }
1086
1087         /*
1088          * We cannot rely on the fs check since SYSV IPC does have an
1089          * additional creator id...
1090          */
1091         ns = current->nsproxy->ipc_ns;
1092         rcu_read_lock();
1093         shp = shm_obtain_object_check(ns, shmid);
1094         if (IS_ERR(shp)) {
1095                 err = PTR_ERR(shp);
1096                 goto out_unlock;
1097         }
1098
1099         err = -EACCES;
1100         if (ipcperms(ns, &shp->shm_perm, acc_mode))
1101                 goto out_unlock;
1102
1103         err = security_shm_shmat(shp, shmaddr, shmflg);
1104         if (err)
1105                 goto out_unlock;
1106
1107         ipc_lock_object(&shp->shm_perm);
1108         path = shp->shm_file->f_path;
1109         path_get(&path);
1110         shp->shm_nattch++;
1111         size = i_size_read(path.dentry->d_inode);
1112         ipc_unlock_object(&shp->shm_perm);
1113         rcu_read_unlock();
1114
1115         err = -ENOMEM;
1116         sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
1117         if (!sfd) {
1118                 path_put(&path);
1119                 goto out_nattch;
1120         }
1121
1122         file = alloc_file(&path, f_mode,
1123                           is_file_hugepages(shp->shm_file) ?
1124                                 &shm_file_operations_huge :
1125                                 &shm_file_operations);
1126         err = PTR_ERR(file);
1127         if (IS_ERR(file)) {
1128                 kfree(sfd);
1129                 path_put(&path);
1130                 goto out_nattch;
1131         }
1132
1133         file->private_data = sfd;
1134         file->f_mapping = shp->shm_file->f_mapping;
1135         sfd->id = shp->shm_perm.id;
1136         sfd->ns = get_ipc_ns(ns);
1137         sfd->file = shp->shm_file;
1138         sfd->vm_ops = NULL;
1139
1140         err = security_mmap_file(file, prot, flags);
1141         if (err)
1142                 goto out_fput;
1143
1144         down_write(&current->mm->mmap_sem);
1145         if (addr && !(shmflg & SHM_REMAP)) {
1146                 err = -EINVAL;
1147                 if (find_vma_intersection(current->mm, addr, addr + size))
1148                         goto invalid;
1149                 /*
1150                  * If shm segment goes below stack, make sure there is some
1151                  * space left for the stack to grow (at least 4 pages).
1152                  */
1153                 if (addr < current->mm->start_stack &&
1154                     addr > current->mm->start_stack - size - PAGE_SIZE * 5)
1155                         goto invalid;
1156         }
1157
1158         addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate);
1159         *raddr = addr;
1160         err = 0;
1161         if (IS_ERR_VALUE(addr))
1162                 err = (long)addr;
1163 invalid:
1164         up_write(&current->mm->mmap_sem);
1165         if (populate)
1166                 mm_populate(addr, populate);
1167
1168 out_fput:
1169         fput(file);
1170
1171 out_nattch:
1172         down_write(&shm_ids(ns).rw_mutex);
1173         shp = shm_lock(ns, shmid);
1174         BUG_ON(IS_ERR(shp));
1175         shp->shm_nattch--;
1176         if (shm_may_destroy(ns, shp))
1177                 shm_destroy(ns, shp);
1178         else
1179                 shm_unlock(shp);
1180         up_write(&shm_ids(ns).rw_mutex);
1181         return err;
1182
1183 out_unlock:
1184         rcu_read_unlock();
1185 out:
1186         return err;
1187 }
1188
1189 SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
1190 {
1191         unsigned long ret;
1192         long err;
1193
1194         err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
1195         if (err)
1196                 return err;
1197         force_successful_syscall_return();
1198         return (long)ret;
1199 }
1200
1201 /*
1202  * detach and kill segment if marked destroyed.
1203  * The work is done in shm_close.
1204  */
1205 SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
1206 {
1207         struct mm_struct *mm = current->mm;
1208         struct vm_area_struct *vma;
1209         unsigned long addr = (unsigned long)shmaddr;
1210         int retval = -EINVAL;
1211 #ifdef CONFIG_MMU
1212         loff_t size = 0;
1213         struct vm_area_struct *next;
1214 #endif
1215
1216         if (addr & ~PAGE_MASK)
1217                 return retval;
1218
1219         down_write(&mm->mmap_sem);
1220
1221         /*
1222          * This function tries to be smart and unmap shm segments that
1223          * were modified by partial mlock or munmap calls:
1224          * - It first determines the size of the shm segment that should be
1225          *   unmapped: It searches for a vma that is backed by shm and that
1226          *   started at address shmaddr. It records it's size and then unmaps
1227          *   it.
1228          * - Then it unmaps all shm vmas that started at shmaddr and that
1229          *   are within the initially determined size.
1230          * Errors from do_munmap are ignored: the function only fails if
1231          * it's called with invalid parameters or if it's called to unmap
1232          * a part of a vma. Both calls in this function are for full vmas,
1233          * the parameters are directly copied from the vma itself and always
1234          * valid - therefore do_munmap cannot fail. (famous last words?)
1235          */
1236         /*
1237          * If it had been mremap()'d, the starting address would not
1238          * match the usual checks anyway. So assume all vma's are
1239          * above the starting address given.
1240          */
1241         vma = find_vma(mm, addr);
1242
1243 #ifdef CONFIG_MMU
1244         while (vma) {
1245                 next = vma->vm_next;
1246
1247                 /*
1248                  * Check if the starting address would match, i.e. it's
1249                  * a fragment created by mprotect() and/or munmap(), or it
1250                  * otherwise it starts at this address with no hassles.
1251                  */
1252                 if ((vma->vm_ops == &shm_vm_ops) &&
1253                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
1254
1255
1256                         size = file_inode(vma->vm_file)->i_size;
1257                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1258                         /*
1259                          * We discovered the size of the shm segment, so
1260                          * break out of here and fall through to the next
1261                          * loop that uses the size information to stop
1262                          * searching for matching vma's.
1263                          */
1264                         retval = 0;
1265                         vma = next;
1266                         break;
1267                 }
1268                 vma = next;
1269         }
1270
1271         /*
1272          * We need look no further than the maximum address a fragment
1273          * could possibly have landed at. Also cast things to loff_t to
1274          * prevent overflows and make comparisons vs. equal-width types.
1275          */
1276         size = PAGE_ALIGN(size);
1277         while (vma && (loff_t)(vma->vm_end - addr) <= size) {
1278                 next = vma->vm_next;
1279
1280                 /* finding a matching vma now does not alter retval */
1281                 if ((vma->vm_ops == &shm_vm_ops) &&
1282                         (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff)
1283
1284                         do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1285                 vma = next;
1286         }
1287
1288 #else /* CONFIG_MMU */
1289         /* under NOMMU conditions, the exact address to be destroyed must be
1290          * given */
1291         retval = -EINVAL;
1292         if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
1293                 do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1294                 retval = 0;
1295         }
1296
1297 #endif
1298
1299         up_write(&mm->mmap_sem);
1300         return retval;
1301 }
1302
1303 #ifdef CONFIG_PROC_FS
1304 static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
1305 {
1306         struct user_namespace *user_ns = seq_user_ns(s);
1307         struct shmid_kernel *shp = it;
1308         unsigned long rss = 0, swp = 0;
1309
1310         shm_add_rss_swap(shp, &rss, &swp);
1311
1312 #if BITS_PER_LONG <= 32
1313 #define SIZE_SPEC "%10lu"
1314 #else
1315 #define SIZE_SPEC "%21lu"
1316 #endif
1317
1318         return seq_printf(s,
1319                           "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
1320                           "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
1321                           SIZE_SPEC " " SIZE_SPEC "\n",
1322                           shp->shm_perm.key,
1323                           shp->shm_perm.id,
1324                           shp->shm_perm.mode,
1325                           shp->shm_segsz,
1326                           shp->shm_cprid,
1327                           shp->shm_lprid,
1328                           shp->shm_nattch,
1329                           from_kuid_munged(user_ns, shp->shm_perm.uid),
1330                           from_kgid_munged(user_ns, shp->shm_perm.gid),
1331                           from_kuid_munged(user_ns, shp->shm_perm.cuid),
1332                           from_kgid_munged(user_ns, shp->shm_perm.cgid),
1333                           shp->shm_atim,
1334                           shp->shm_dtim,
1335                           shp->shm_ctim,
1336                           rss * PAGE_SIZE,
1337                           swp * PAGE_SIZE);
1338 }
1339 #endif