linux/ipc/shm.c
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   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 <linux/uaccess.h>
  47
  48#include "util.h"
  49
  50struct 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
  59static const struct file_operations shm_file_operations;
  60static 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
  67static int newseg(struct ipc_namespace *, struct ipc_params *);
  68static void shm_open(struct vm_area_struct *vma);
  69static void shm_close(struct vm_area_struct *vma);
  70static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp);
  71#ifdef CONFIG_PROC_FS
  72static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
  73#endif
  74
  75void 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 */
  89static 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
 104void 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
 111static int __init ipc_ns_init(void)
 112{
 113        shm_init_ns(&init_ipc_ns);
 114        return 0;
 115}
 116
 117pure_initcall(ipc_ns_init);
 118
 119void __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
 130static 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
 140static 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 */
 154static 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
 164static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)
 165{
 166        rcu_read_lock();
 167        ipc_lock_object(&ipcp->shm_perm);
 168}
 169
 170static 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
 179static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
 180{
 181        list_del(&s->shm_clist);
 182        ipc_rmid(&shm_ids(ns), &s->shm_perm);
 183}
 184
 185
 186/* This is called by fork, once for every shm attach. */
 187static void shm_open(struct vm_area_struct *vma)
 188{
 189        struct file *file = vma->vm_file;
 190        struct shm_file_data *sfd = shm_file_data(file);
 191        struct shmid_kernel *shp;
 192
 193        shp = shm_lock(sfd->ns, sfd->id);
 194        BUG_ON(IS_ERR(shp));
 195        shp->shm_atim = get_seconds();
 196        shp->shm_lprid = task_tgid_vnr(current);
 197        shp->shm_nattch++;
 198        shm_unlock(shp);
 199}
 200
 201/*
 202 * shm_destroy - free the struct shmid_kernel
 203 *
 204 * @ns: namespace
 205 * @shp: struct to free
 206 *
 207 * It has to be called with shp and shm_ids.rwsem (writer) locked,
 208 * but returns with shp unlocked and freed.
 209 */
 210static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
 211{
 212        struct file *shm_file;
 213
 214        shm_file = shp->shm_file;
 215        shp->shm_file = NULL;
 216        ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;
 217        shm_rmid(ns, shp);
 218        shm_unlock(shp);
 219        if (!is_file_hugepages(shm_file))
 220                shmem_lock(shm_file, 0, shp->mlock_user);
 221        else if (shp->mlock_user)
 222                user_shm_unlock(i_size_read(file_inode(shm_file)),
 223                                shp->mlock_user);
 224        fput(shm_file);
 225        ipc_rcu_putref(shp, shm_rcu_free);
 226}
 227
 228/*
 229 * shm_may_destroy - identifies whether shm segment should be destroyed now
 230 *
 231 * Returns true if and only if there are no active users of the segment and
 232 * one of the following is true:
 233 *
 234 * 1) shmctl(id, IPC_RMID, NULL) was called for this shp
 235 *
 236 * 2) sysctl kernel.shm_rmid_forced is set to 1.
 237 */
 238static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)
 239{
 240        return (shp->shm_nattch == 0) &&
 241               (ns->shm_rmid_forced ||
 242                (shp->shm_perm.mode & SHM_DEST));
 243}
 244
 245/*
 246 * remove the attach descriptor vma.
 247 * free memory for segment if it is marked destroyed.
 248 * The descriptor has already been removed from the current->mm->mmap list
 249 * and will later be kfree()d.
 250 */
 251static void shm_close(struct vm_area_struct *vma)
 252{
 253        struct file *file = vma->vm_file;
 254        struct shm_file_data *sfd = shm_file_data(file);
 255        struct shmid_kernel *shp;
 256        struct ipc_namespace *ns = sfd->ns;
 257
 258        down_write(&shm_ids(ns).rwsem);
 259        /* remove from the list of attaches of the shm segment */
 260        shp = shm_lock(ns, sfd->id);
 261        BUG_ON(IS_ERR(shp));
 262        shp->shm_lprid = task_tgid_vnr(current);
 263        shp->shm_dtim = get_seconds();
 264        shp->shm_nattch--;
 265        if (shm_may_destroy(ns, shp))
 266                shm_destroy(ns, shp);
 267        else
 268                shm_unlock(shp);
 269        up_write(&shm_ids(ns).rwsem);
 270}
 271
 272/* Called with ns->shm_ids(ns).rwsem locked */
 273static int shm_try_destroy_orphaned(int id, void *p, void *data)
 274{
 275        struct ipc_namespace *ns = data;
 276        struct kern_ipc_perm *ipcp = p;
 277        struct shmid_kernel *shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 278
 279        /*
 280         * We want to destroy segments without users and with already
 281         * exit'ed originating process.
 282         *
 283         * As shp->* are changed under rwsem, it's safe to skip shp locking.
 284         */
 285        if (shp->shm_creator != NULL)
 286                return 0;
 287
 288        if (shm_may_destroy(ns, shp)) {
 289                shm_lock_by_ptr(shp);
 290                shm_destroy(ns, shp);
 291        }
 292        return 0;
 293}
 294
 295void shm_destroy_orphaned(struct ipc_namespace *ns)
 296{
 297        down_write(&shm_ids(ns).rwsem);
 298        if (shm_ids(ns).in_use)
 299                idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);
 300        up_write(&shm_ids(ns).rwsem);
 301}
 302
 303/* Locking assumes this will only be called with task == current */
 304void exit_shm(struct task_struct *task)
 305{
 306        struct ipc_namespace *ns = task->nsproxy->ipc_ns;
 307        struct shmid_kernel *shp, *n;
 308
 309        if (list_empty(&task->sysvshm.shm_clist))
 310                return;
 311
 312        /*
 313         * If kernel.shm_rmid_forced is not set then only keep track of
 314         * which shmids are orphaned, so that a later set of the sysctl
 315         * can clean them up.
 316         */
 317        if (!ns->shm_rmid_forced) {
 318                down_read(&shm_ids(ns).rwsem);
 319                list_for_each_entry(shp, &task->sysvshm.shm_clist, shm_clist)
 320                        shp->shm_creator = NULL;
 321                /*
 322                 * Only under read lock but we are only called on current
 323                 * so no entry on the list will be shared.
 324                 */
 325                list_del(&task->sysvshm.shm_clist);
 326                up_read(&shm_ids(ns).rwsem);
 327                return;
 328        }
 329
 330        /*
 331         * Destroy all already created segments, that were not yet mapped,
 332         * and mark any mapped as orphan to cover the sysctl toggling.
 333         * Destroy is skipped if shm_may_destroy() returns false.
 334         */
 335        down_write(&shm_ids(ns).rwsem);
 336        list_for_each_entry_safe(shp, n, &task->sysvshm.shm_clist, shm_clist) {
 337                shp->shm_creator = NULL;
 338
 339                if (shm_may_destroy(ns, shp)) {
 340                        shm_lock_by_ptr(shp);
 341                        shm_destroy(ns, shp);
 342                }
 343        }
 344
 345        /* Remove the list head from any segments still attached. */
 346        list_del(&task->sysvshm.shm_clist);
 347        up_write(&shm_ids(ns).rwsem);
 348}
 349
 350static int shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 351{
 352        struct file *file = vma->vm_file;
 353        struct shm_file_data *sfd = shm_file_data(file);
 354
 355        return sfd->vm_ops->fault(vma, vmf);
 356}
 357
 358#ifdef CONFIG_NUMA
 359static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
 360{
 361        struct file *file = vma->vm_file;
 362        struct shm_file_data *sfd = shm_file_data(file);
 363        int err = 0;
 364        if (sfd->vm_ops->set_policy)
 365                err = sfd->vm_ops->set_policy(vma, new);
 366        return err;
 367}
 368
 369static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
 370                                        unsigned long addr)
 371{
 372        struct file *file = vma->vm_file;
 373        struct shm_file_data *sfd = shm_file_data(file);
 374        struct mempolicy *pol = NULL;
 375
 376        if (sfd->vm_ops->get_policy)
 377                pol = sfd->vm_ops->get_policy(vma, addr);
 378        else if (vma->vm_policy)
 379                pol = vma->vm_policy;
 380
 381        return pol;
 382}
 383#endif
 384
 385static int shm_mmap(struct file *file, struct vm_area_struct *vma)
 386{
 387        struct shm_file_data *sfd = shm_file_data(file);
 388        int ret;
 389
 390        ret = sfd->file->f_op->mmap(sfd->file, vma);
 391        if (ret != 0)
 392                return ret;
 393        sfd->vm_ops = vma->vm_ops;
 394#ifdef CONFIG_MMU
 395        BUG_ON(!sfd->vm_ops->fault);
 396#endif
 397        vma->vm_ops = &shm_vm_ops;
 398        shm_open(vma);
 399
 400        return ret;
 401}
 402
 403static int shm_release(struct inode *ino, struct file *file)
 404{
 405        struct shm_file_data *sfd = shm_file_data(file);
 406
 407        put_ipc_ns(sfd->ns);
 408        shm_file_data(file) = NULL;
 409        kfree(sfd);
 410        return 0;
 411}
 412
 413static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 414{
 415        struct shm_file_data *sfd = shm_file_data(file);
 416
 417        if (!sfd->file->f_op->fsync)
 418                return -EINVAL;
 419        return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
 420}
 421
 422static long shm_fallocate(struct file *file, int mode, loff_t offset,
 423                          loff_t len)
 424{
 425        struct shm_file_data *sfd = shm_file_data(file);
 426
 427        if (!sfd->file->f_op->fallocate)
 428                return -EOPNOTSUPP;
 429        return sfd->file->f_op->fallocate(file, mode, offset, len);
 430}
 431
 432static unsigned long shm_get_unmapped_area(struct file *file,
 433        unsigned long addr, unsigned long len, unsigned long pgoff,
 434        unsigned long flags)
 435{
 436        struct shm_file_data *sfd = shm_file_data(file);
 437        return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len,
 438                                                pgoff, flags);
 439}
 440
 441static const struct file_operations shm_file_operations = {
 442        .mmap           = shm_mmap,
 443        .fsync          = shm_fsync,
 444        .release        = shm_release,
 445#ifndef CONFIG_MMU
 446        .get_unmapped_area      = shm_get_unmapped_area,
 447#endif
 448        .llseek         = noop_llseek,
 449        .fallocate      = shm_fallocate,
 450};
 451
 452static const struct file_operations shm_file_operations_huge = {
 453        .mmap           = shm_mmap,
 454        .fsync          = shm_fsync,
 455        .release        = shm_release,
 456        .get_unmapped_area      = shm_get_unmapped_area,
 457        .llseek         = noop_llseek,
 458        .fallocate      = shm_fallocate,
 459};
 460
 461int is_file_shm_hugepages(struct file *file)
 462{
 463        return file->f_op == &shm_file_operations_huge;
 464}
 465
 466static const struct vm_operations_struct shm_vm_ops = {
 467        .open   = shm_open,     /* callback for a new vm-area open */
 468        .close  = shm_close,    /* callback for when the vm-area is released */
 469        .fault  = shm_fault,
 470#if defined(CONFIG_NUMA)
 471        .set_policy = shm_set_policy,
 472        .get_policy = shm_get_policy,
 473#endif
 474};
 475
 476/**
 477 * newseg - Create a new shared memory segment
 478 * @ns: namespace
 479 * @params: ptr to the structure that contains key, size and shmflg
 480 *
 481 * Called with shm_ids.rwsem held as a writer.
 482 */
 483static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 484{
 485        key_t key = params->key;
 486        int shmflg = params->flg;
 487        size_t size = params->u.size;
 488        int error;
 489        struct shmid_kernel *shp;
 490        size_t numpages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 491        struct file *file;
 492        char name[13];
 493        int id;
 494        vm_flags_t acctflag = 0;
 495
 496        if (size < SHMMIN || size > ns->shm_ctlmax)
 497                return -EINVAL;
 498
 499        if (numpages << PAGE_SHIFT < size)
 500                return -ENOSPC;
 501
 502        if (ns->shm_tot + numpages < ns->shm_tot ||
 503                        ns->shm_tot + numpages > ns->shm_ctlall)
 504                return -ENOSPC;
 505
 506        shp = ipc_rcu_alloc(sizeof(*shp));
 507        if (!shp)
 508                return -ENOMEM;
 509
 510        shp->shm_perm.key = key;
 511        shp->shm_perm.mode = (shmflg & S_IRWXUGO);
 512        shp->mlock_user = NULL;
 513
 514        shp->shm_perm.security = NULL;
 515        error = security_shm_alloc(shp);
 516        if (error) {
 517                ipc_rcu_putref(shp, ipc_rcu_free);
 518                return error;
 519        }
 520
 521        sprintf(name, "SYSV%08x", key);
 522        if (shmflg & SHM_HUGETLB) {
 523                struct hstate *hs;
 524                size_t hugesize;
 525
 526                hs = hstate_sizelog((shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 527                if (!hs) {
 528                        error = -EINVAL;
 529                        goto no_file;
 530                }
 531                hugesize = ALIGN(size, huge_page_size(hs));
 532
 533                /* hugetlb_file_setup applies strict accounting */
 534                if (shmflg & SHM_NORESERVE)
 535                        acctflag = VM_NORESERVE;
 536                file = hugetlb_file_setup(name, hugesize, acctflag,
 537                                  &shp->mlock_user, HUGETLB_SHMFS_INODE,
 538                                (shmflg >> SHM_HUGE_SHIFT) & SHM_HUGE_MASK);
 539        } else {
 540                /*
 541                 * Do not allow no accounting for OVERCOMMIT_NEVER, even
 542                 * if it's asked for.
 543                 */
 544                if  ((shmflg & SHM_NORESERVE) &&
 545                                sysctl_overcommit_memory != OVERCOMMIT_NEVER)
 546                        acctflag = VM_NORESERVE;
 547                file = shmem_file_setup(name, size, acctflag);
 548        }
 549        error = PTR_ERR(file);
 550        if (IS_ERR(file))
 551                goto no_file;
 552
 553        id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);
 554        if (id < 0) {
 555                error = id;
 556                goto no_id;
 557        }
 558
 559        shp->shm_cprid = task_tgid_vnr(current);
 560        shp->shm_lprid = 0;
 561        shp->shm_atim = shp->shm_dtim = 0;
 562        shp->shm_ctim = get_seconds();
 563        shp->shm_segsz = size;
 564        shp->shm_nattch = 0;
 565        shp->shm_file = file;
 566        shp->shm_creator = current;
 567        list_add(&shp->shm_clist, &current->sysvshm.shm_clist);
 568
 569        /*
 570         * shmid gets reported as "inode#" in /proc/pid/maps.
 571         * proc-ps tools use this. Changing this will break them.
 572         */
 573        file_inode(file)->i_ino = shp->shm_perm.id;
 574
 575        ns->shm_tot += numpages;
 576        error = shp->shm_perm.id;
 577
 578        ipc_unlock_object(&shp->shm_perm);
 579        rcu_read_unlock();
 580        return error;
 581
 582no_id:
 583        if (is_file_hugepages(file) && shp->mlock_user)
 584                user_shm_unlock(size, shp->mlock_user);
 585        fput(file);
 586no_file:
 587        ipc_rcu_putref(shp, shm_rcu_free);
 588        return error;
 589}
 590
 591/*
 592 * Called with shm_ids.rwsem and ipcp locked.
 593 */
 594static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
 595{
 596        struct shmid_kernel *shp;
 597
 598        shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 599        return security_shm_associate(shp, shmflg);
 600}
 601
 602/*
 603 * Called with shm_ids.rwsem and ipcp locked.
 604 */
 605static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
 606                                struct ipc_params *params)
 607{
 608        struct shmid_kernel *shp;
 609
 610        shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 611        if (shp->shm_segsz < params->u.size)
 612                return -EINVAL;
 613
 614        return 0;
 615}
 616
 617SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg)
 618{
 619        struct ipc_namespace *ns;
 620        static const struct ipc_ops shm_ops = {
 621                .getnew = newseg,
 622                .associate = shm_security,
 623                .more_checks = shm_more_checks,
 624        };
 625        struct ipc_params shm_params;
 626
 627        ns = current->nsproxy->ipc_ns;
 628
 629        shm_params.key = key;
 630        shm_params.flg = shmflg;
 631        shm_params.u.size = size;
 632
 633        return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);
 634}
 635
 636static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_ds *in, int version)
 637{
 638        switch (version) {
 639        case IPC_64:
 640                return copy_to_user(buf, in, sizeof(*in));
 641        case IPC_OLD:
 642            {
 643                struct shmid_ds out;
 644
 645                memset(&out, 0, sizeof(out));
 646                ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
 647                out.shm_segsz   = in->shm_segsz;
 648                out.shm_atime   = in->shm_atime;
 649                out.shm_dtime   = in->shm_dtime;
 650                out.shm_ctime   = in->shm_ctime;
 651                out.shm_cpid    = in->shm_cpid;
 652                out.shm_lpid    = in->shm_lpid;
 653                out.shm_nattch  = in->shm_nattch;
 654
 655                return copy_to_user(buf, &out, sizeof(out));
 656            }
 657        default:
 658                return -EINVAL;
 659        }
 660}
 661
 662static inline unsigned long
 663copy_shmid_from_user(struct shmid64_ds *out, void __user *buf, int version)
 664{
 665        switch (version) {
 666        case IPC_64:
 667                if (copy_from_user(out, buf, sizeof(*out)))
 668                        return -EFAULT;
 669                return 0;
 670        case IPC_OLD:
 671            {
 672                struct shmid_ds tbuf_old;
 673
 674                if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
 675                        return -EFAULT;
 676
 677                out->shm_perm.uid       = tbuf_old.shm_perm.uid;
 678                out->shm_perm.gid       = tbuf_old.shm_perm.gid;
 679                out->shm_perm.mode      = tbuf_old.shm_perm.mode;
 680
 681                return 0;
 682            }
 683        default:
 684                return -EINVAL;
 685        }
 686}
 687
 688static inline unsigned long copy_shminfo_to_user(void __user *buf, struct shminfo64 *in, int version)
 689{
 690        switch (version) {
 691        case IPC_64:
 692                return copy_to_user(buf, in, sizeof(*in));
 693        case IPC_OLD:
 694            {
 695                struct shminfo out;
 696
 697                if (in->shmmax > INT_MAX)
 698                        out.shmmax = INT_MAX;
 699                else
 700                        out.shmmax = (int)in->shmmax;
 701
 702                out.shmmin      = in->shmmin;
 703                out.shmmni      = in->shmmni;
 704                out.shmseg      = in->shmseg;
 705                out.shmall      = in->shmall;
 706
 707                return copy_to_user(buf, &out, sizeof(out));
 708            }
 709        default:
 710                return -EINVAL;
 711        }
 712}
 713
 714/*
 715 * Calculate and add used RSS and swap pages of a shm.
 716 * Called with shm_ids.rwsem held as a reader
 717 */
 718static void shm_add_rss_swap(struct shmid_kernel *shp,
 719        unsigned long *rss_add, unsigned long *swp_add)
 720{
 721        struct inode *inode;
 722
 723        inode = file_inode(shp->shm_file);
 724
 725        if (is_file_hugepages(shp->shm_file)) {
 726                struct address_space *mapping = inode->i_mapping;
 727                struct hstate *h = hstate_file(shp->shm_file);
 728                *rss_add += pages_per_huge_page(h) * mapping->nrpages;
 729        } else {
 730#ifdef CONFIG_SHMEM
 731                struct shmem_inode_info *info = SHMEM_I(inode);
 732                spin_lock(&info->lock);
 733                *rss_add += inode->i_mapping->nrpages;
 734                *swp_add += info->swapped;
 735                spin_unlock(&info->lock);
 736#else
 737                *rss_add += inode->i_mapping->nrpages;
 738#endif
 739        }
 740}
 741
 742/*
 743 * Called with shm_ids.rwsem held as a reader
 744 */
 745static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,
 746                unsigned long *swp)
 747{
 748        int next_id;
 749        int total, in_use;
 750
 751        *rss = 0;
 752        *swp = 0;
 753
 754        in_use = shm_ids(ns).in_use;
 755
 756        for (total = 0, next_id = 0; total < in_use; next_id++) {
 757                struct kern_ipc_perm *ipc;
 758                struct shmid_kernel *shp;
 759
 760                ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);
 761                if (ipc == NULL)
 762                        continue;
 763                shp = container_of(ipc, struct shmid_kernel, shm_perm);
 764
 765                shm_add_rss_swap(shp, rss, swp);
 766
 767                total++;
 768        }
 769}
 770
 771/*
 772 * This function handles some shmctl commands which require the rwsem
 773 * to be held in write mode.
 774 * NOTE: no locks must be held, the rwsem is taken inside this function.
 775 */
 776static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,
 777                       struct shmid_ds __user *buf, int version)
 778{
 779        struct kern_ipc_perm *ipcp;
 780        struct shmid64_ds shmid64;
 781        struct shmid_kernel *shp;
 782        int err;
 783
 784        if (cmd == IPC_SET) {
 785                if (copy_shmid_from_user(&shmid64, buf, version))
 786                        return -EFAULT;
 787        }
 788
 789        down_write(&shm_ids(ns).rwsem);
 790        rcu_read_lock();
 791
 792        ipcp = ipcctl_pre_down_nolock(ns, &shm_ids(ns), shmid, cmd,
 793                                      &shmid64.shm_perm, 0);
 794        if (IS_ERR(ipcp)) {
 795                err = PTR_ERR(ipcp);
 796                goto out_unlock1;
 797        }
 798
 799        shp = container_of(ipcp, struct shmid_kernel, shm_perm);
 800
 801        err = security_shm_shmctl(shp, cmd);
 802        if (err)
 803                goto out_unlock1;
 804
 805        switch (cmd) {
 806        case IPC_RMID:
 807                ipc_lock_object(&shp->shm_perm);
 808                /* do_shm_rmid unlocks the ipc object and rcu */
 809                do_shm_rmid(ns, ipcp);
 810                goto out_up;
 811        case IPC_SET:
 812                ipc_lock_object(&shp->shm_perm);
 813                err = ipc_update_perm(&shmid64.shm_perm, ipcp);
 814                if (err)
 815                        goto out_unlock0;
 816                shp->shm_ctim = get_seconds();
 817                break;
 818        default:
 819                err = -EINVAL;
 820                goto out_unlock1;
 821        }
 822
 823out_unlock0:
 824        ipc_unlock_object(&shp->shm_perm);
 825out_unlock1:
 826        rcu_read_unlock();
 827out_up:
 828        up_write(&shm_ids(ns).rwsem);
 829        return err;
 830}
 831
 832static int shmctl_nolock(struct ipc_namespace *ns, int shmid,
 833                         int cmd, int version, void __user *buf)
 834{
 835        int err;
 836        struct shmid_kernel *shp;
 837
 838        /* preliminary security checks for *_INFO */
 839        if (cmd == IPC_INFO || cmd == SHM_INFO) {
 840                err = security_shm_shmctl(NULL, cmd);
 841                if (err)
 842                        return err;
 843        }
 844
 845        switch (cmd) {
 846        case IPC_INFO:
 847        {
 848                struct shminfo64 shminfo;
 849
 850                memset(&shminfo, 0, sizeof(shminfo));
 851                shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
 852                shminfo.shmmax = ns->shm_ctlmax;
 853                shminfo.shmall = ns->shm_ctlall;
 854
 855                shminfo.shmmin = SHMMIN;
 856                if (copy_shminfo_to_user(buf, &shminfo, version))
 857                        return -EFAULT;
 858
 859                down_read(&shm_ids(ns).rwsem);
 860                err = ipc_get_maxid(&shm_ids(ns));
 861                up_read(&shm_ids(ns).rwsem);
 862
 863                if (err < 0)
 864                        err = 0;
 865                goto out;
 866        }
 867        case SHM_INFO:
 868        {
 869                struct shm_info shm_info;
 870
 871                memset(&shm_info, 0, sizeof(shm_info));
 872                down_read(&shm_ids(ns).rwsem);
 873                shm_info.used_ids = shm_ids(ns).in_use;
 874                shm_get_stat(ns, &shm_info.shm_rss, &shm_info.shm_swp);
 875                shm_info.shm_tot = ns->shm_tot;
 876                shm_info.swap_attempts = 0;
 877                shm_info.swap_successes = 0;
 878                err = ipc_get_maxid(&shm_ids(ns));
 879                up_read(&shm_ids(ns).rwsem);
 880                if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
 881                        err = -EFAULT;
 882                        goto out;
 883                }
 884
 885                err = err < 0 ? 0 : err;
 886                goto out;
 887        }
 888        case SHM_STAT:
 889        case IPC_STAT:
 890        {
 891                struct shmid64_ds tbuf;
 892                int result;
 893
 894                rcu_read_lock();
 895                if (cmd == SHM_STAT) {
 896                        shp = shm_obtain_object(ns, shmid);
 897                        if (IS_ERR(shp)) {
 898                                err = PTR_ERR(shp);
 899                                goto out_unlock;
 900                        }
 901                        result = shp->shm_perm.id;
 902                } else {
 903                        shp = shm_obtain_object_check(ns, shmid);
 904                        if (IS_ERR(shp)) {
 905                                err = PTR_ERR(shp);
 906                                goto out_unlock;
 907                        }
 908                        result = 0;
 909                }
 910
 911                err = -EACCES;
 912                if (ipcperms(ns, &shp->shm_perm, S_IRUGO))
 913                        goto out_unlock;
 914
 915                err = security_shm_shmctl(shp, cmd);
 916                if (err)
 917                        goto out_unlock;
 918
 919                memset(&tbuf, 0, sizeof(tbuf));
 920                kernel_to_ipc64_perm(&shp->shm_perm, &tbuf.shm_perm);
 921                tbuf.shm_segsz  = shp->shm_segsz;
 922                tbuf.shm_atime  = shp->shm_atim;
 923                tbuf.shm_dtime  = shp->shm_dtim;
 924                tbuf.shm_ctime  = shp->shm_ctim;
 925                tbuf.shm_cpid   = shp->shm_cprid;
 926                tbuf.shm_lpid   = shp->shm_lprid;
 927                tbuf.shm_nattch = shp->shm_nattch;
 928                rcu_read_unlock();
 929
 930                if (copy_shmid_to_user(buf, &tbuf, version))
 931                        err = -EFAULT;
 932                else
 933                        err = result;
 934                goto out;
 935        }
 936        default:
 937                return -EINVAL;
 938        }
 939
 940out_unlock:
 941        rcu_read_unlock();
 942out:
 943        return err;
 944}
 945
 946SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
 947{
 948        struct shmid_kernel *shp;
 949        int err, version;
 950        struct ipc_namespace *ns;
 951
 952        if (cmd < 0 || shmid < 0)
 953                return -EINVAL;
 954
 955        version = ipc_parse_version(&cmd);
 956        ns = current->nsproxy->ipc_ns;
 957
 958        switch (cmd) {
 959        case IPC_INFO:
 960        case SHM_INFO:
 961        case SHM_STAT:
 962        case IPC_STAT:
 963                return shmctl_nolock(ns, shmid, cmd, version, buf);
 964        case IPC_RMID:
 965        case IPC_SET:
 966                return shmctl_down(ns, shmid, cmd, buf, version);
 967        case SHM_LOCK:
 968        case SHM_UNLOCK:
 969        {
 970                struct file *shm_file;
 971
 972                rcu_read_lock();
 973                shp = shm_obtain_object_check(ns, shmid);
 974                if (IS_ERR(shp)) {
 975                        err = PTR_ERR(shp);
 976                        goto out_unlock1;
 977                }
 978
 979                audit_ipc_obj(&(shp->shm_perm));
 980                err = security_shm_shmctl(shp, cmd);
 981                if (err)
 982                        goto out_unlock1;
 983
 984                ipc_lock_object(&shp->shm_perm);
 985
 986                /* check if shm_destroy() is tearing down shp */
 987                if (!ipc_valid_object(&shp->shm_perm)) {
 988                        err = -EIDRM;
 989                        goto out_unlock0;
 990                }
 991
 992                if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {
 993                        kuid_t euid = current_euid();
 994                        if (!uid_eq(euid, shp->shm_perm.uid) &&
 995                            !uid_eq(euid, shp->shm_perm.cuid)) {
 996                                err = -EPERM;
 997                                goto out_unlock0;
 998                        }
 999                        if (cmd == SHM_LOCK && !rlimit(RLIMIT_MEMLOCK)) {
1000                                err = -EPERM;
1001                                goto out_unlock0;
1002                        }
1003                }
1004
1005                shm_file = shp->shm_file;
1006                if (is_file_hugepages(shm_file))
1007                        goto out_unlock0;
1008
1009                if (cmd == SHM_LOCK) {
1010                        struct user_struct *user = current_user();
1011                        err = shmem_lock(shm_file, 1, user);
1012                        if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) {
1013                                shp->shm_perm.mode |= SHM_LOCKED;
1014                                shp->mlock_user = user;
1015                        }
1016                        goto out_unlock0;
1017                }
1018
1019                /* SHM_UNLOCK */
1020                if (!(shp->shm_perm.mode & SHM_LOCKED))
1021                        goto out_unlock0;
1022                shmem_lock(shm_file, 0, shp->mlock_user);
1023                shp->shm_perm.mode &= ~SHM_LOCKED;
1024                shp->mlock_user = NULL;
1025                get_file(shm_file);
1026                ipc_unlock_object(&shp->shm_perm);
1027                rcu_read_unlock();
1028                shmem_unlock_mapping(shm_file->f_mapping);
1029
1030                fput(shm_file);
1031                return err;
1032        }
1033        default:
1034                return -EINVAL;
1035        }
1036
1037out_unlock0:
1038        ipc_unlock_object(&shp->shm_perm);
1039out_unlock1:
1040        rcu_read_unlock();
1041        return err;
1042}
1043
1044/*
1045 * Fix shmaddr, allocate descriptor, map shm, add attach descriptor to lists.
1046 *
1047 * NOTE! Despite the name, this is NOT a direct system call entrypoint. The
1048 * "raddr" thing points to kernel space, and there has to be a wrapper around
1049 * this.
1050 */
1051long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
1052              unsigned long shmlba)
1053{
1054        struct shmid_kernel *shp;
1055        unsigned long addr;
1056        unsigned long size;
1057        struct file *file;
1058        int    err;
1059        unsigned long flags;
1060        unsigned long prot;
1061        int acc_mode;
1062        struct ipc_namespace *ns;
1063        struct shm_file_data *sfd;
1064        struct path path;
1065        fmode_t f_mode;
1066        unsigned long populate = 0;
1067
1068        err = -EINVAL;
1069        if (shmid < 0)
1070                goto out;
1071        else if ((addr = (ulong)shmaddr)) {
1072                if (addr & (shmlba - 1)) {
1073                        if (shmflg & SHM_RND)
1074                                addr &= ~(shmlba - 1);     /* round down */
1075                        else
1076#ifndef __ARCH_FORCE_SHMLBA
1077                                if (addr & ~PAGE_MASK)
1078#endif
1079                                        goto out;
1080                }
1081                flags = MAP_SHARED | MAP_FIXED;
1082        } else {
1083                if ((shmflg & SHM_REMAP))
1084                        goto out;
1085
1086                flags = MAP_SHARED;
1087        }
1088
1089        if (shmflg & SHM_RDONLY) {
1090                prot = PROT_READ;
1091                acc_mode = S_IRUGO;
1092                f_mode = FMODE_READ;
1093        } else {
1094                prot = PROT_READ | PROT_WRITE;
1095                acc_mode = S_IRUGO | S_IWUGO;
1096                f_mode = FMODE_READ | FMODE_WRITE;
1097        }
1098        if (shmflg & SHM_EXEC) {
1099                prot |= PROT_EXEC;
1100                acc_mode |= S_IXUGO;
1101        }
1102
1103        /*
1104         * We cannot rely on the fs check since SYSV IPC does have an
1105         * additional creator id...
1106         */
1107        ns = current->nsproxy->ipc_ns;
1108        rcu_read_lock();
1109        shp = shm_obtain_object_check(ns, shmid);
1110        if (IS_ERR(shp)) {
1111                err = PTR_ERR(shp);
1112                goto out_unlock;
1113        }
1114
1115        err = -EACCES;
1116        if (ipcperms(ns, &shp->shm_perm, acc_mode))
1117                goto out_unlock;
1118
1119        err = security_shm_shmat(shp, shmaddr, shmflg);
1120        if (err)
1121                goto out_unlock;
1122
1123        ipc_lock_object(&shp->shm_perm);
1124
1125        /* check if shm_destroy() is tearing down shp */
1126        if (!ipc_valid_object(&shp->shm_perm)) {
1127                ipc_unlock_object(&shp->shm_perm);
1128                err = -EIDRM;
1129                goto out_unlock;
1130        }
1131
1132        path = shp->shm_file->f_path;
1133        path_get(&path);
1134        shp->shm_nattch++;
1135        size = i_size_read(path.dentry->d_inode);
1136        ipc_unlock_object(&shp->shm_perm);
1137        rcu_read_unlock();
1138
1139        err = -ENOMEM;
1140        sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
1141        if (!sfd) {
1142                path_put(&path);
1143                goto out_nattch;
1144        }
1145
1146        file = alloc_file(&path, f_mode,
1147                          is_file_hugepages(shp->shm_file) ?
1148                                &shm_file_operations_huge :
1149                                &shm_file_operations);
1150        err = PTR_ERR(file);
1151        if (IS_ERR(file)) {
1152                kfree(sfd);
1153                path_put(&path);
1154                goto out_nattch;
1155        }
1156
1157        file->private_data = sfd;
1158        file->f_mapping = shp->shm_file->f_mapping;
1159        sfd->id = shp->shm_perm.id;
1160        sfd->ns = get_ipc_ns(ns);
1161        sfd->file = shp->shm_file;
1162        sfd->vm_ops = NULL;
1163
1164        err = security_mmap_file(file, prot, flags);
1165        if (err)
1166                goto out_fput;
1167
1168        down_write(&current->mm->mmap_sem);
1169        if (addr && !(shmflg & SHM_REMAP)) {
1170                err = -EINVAL;
1171                if (addr + size < addr)
1172                        goto invalid;
1173
1174                if (find_vma_intersection(current->mm, addr, addr + size))
1175                        goto invalid;
1176        }
1177
1178        addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate);
1179        *raddr = addr;
1180        err = 0;
1181        if (IS_ERR_VALUE(addr))
1182                err = (long)addr;
1183invalid:
1184        up_write(&current->mm->mmap_sem);
1185        if (populate)
1186                mm_populate(addr, populate);
1187
1188out_fput:
1189        fput(file);
1190
1191out_nattch:
1192        down_write(&shm_ids(ns).rwsem);
1193        shp = shm_lock(ns, shmid);
1194        BUG_ON(IS_ERR(shp));
1195        shp->shm_nattch--;
1196        if (shm_may_destroy(ns, shp))
1197                shm_destroy(ns, shp);
1198        else
1199                shm_unlock(shp);
1200        up_write(&shm_ids(ns).rwsem);
1201        return err;
1202
1203out_unlock:
1204        rcu_read_unlock();
1205out:
1206        return err;
1207}
1208
1209SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
1210{
1211        unsigned long ret;
1212        long err;
1213
1214        err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
1215        if (err)
1216                return err;
1217        force_successful_syscall_return();
1218        return (long)ret;
1219}
1220
1221/*
1222 * detach and kill segment if marked destroyed.
1223 * The work is done in shm_close.
1224 */
1225SYSCALL_DEFINE1(shmdt, char __user *, shmaddr)
1226{
1227        struct mm_struct *mm = current->mm;
1228        struct vm_area_struct *vma;
1229        unsigned long addr = (unsigned long)shmaddr;
1230        int retval = -EINVAL;
1231#ifdef CONFIG_MMU
1232        loff_t size = 0;
1233        struct file *file;
1234        struct vm_area_struct *next;
1235#endif
1236
1237        if (addr & ~PAGE_MASK)
1238                return retval;
1239
1240        down_write(&mm->mmap_sem);
1241
1242        /*
1243         * This function tries to be smart and unmap shm segments that
1244         * were modified by partial mlock or munmap calls:
1245         * - It first determines the size of the shm segment that should be
1246         *   unmapped: It searches for a vma that is backed by shm and that
1247         *   started at address shmaddr. It records it's size and then unmaps
1248         *   it.
1249         * - Then it unmaps all shm vmas that started at shmaddr and that
1250         *   are within the initially determined size and that are from the
1251         *   same shm segment from which we determined the size.
1252         * Errors from do_munmap are ignored: the function only fails if
1253         * it's called with invalid parameters or if it's called to unmap
1254         * a part of a vma. Both calls in this function are for full vmas,
1255         * the parameters are directly copied from the vma itself and always
1256         * valid - therefore do_munmap cannot fail. (famous last words?)
1257         */
1258        /*
1259         * If it had been mremap()'d, the starting address would not
1260         * match the usual checks anyway. So assume all vma's are
1261         * above the starting address given.
1262         */
1263        vma = find_vma(mm, addr);
1264
1265#ifdef CONFIG_MMU
1266        while (vma) {
1267                next = vma->vm_next;
1268
1269                /*
1270                 * Check if the starting address would match, i.e. it's
1271                 * a fragment created by mprotect() and/or munmap(), or it
1272                 * otherwise it starts at this address with no hassles.
1273                 */
1274                if ((vma->vm_ops == &shm_vm_ops) &&
1275                        (vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) {
1276
1277                        /*
1278                         * Record the file of the shm segment being
1279                         * unmapped.  With mremap(), someone could place
1280                         * page from another segment but with equal offsets
1281                         * in the range we are unmapping.
1282                         */
1283                        file = vma->vm_file;
1284                        size = i_size_read(file_inode(vma->vm_file));
1285                        do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1286                        /*
1287                         * We discovered the size of the shm segment, so
1288                         * break out of here and fall through to the next
1289                         * loop that uses the size information to stop
1290                         * searching for matching vma's.
1291                         */
1292                        retval = 0;
1293                        vma = next;
1294                        break;
1295                }
1296                vma = next;
1297        }
1298
1299        /*
1300         * We need look no further than the maximum address a fragment
1301         * could possibly have landed at. Also cast things to loff_t to
1302         * prevent overflows and make comparisons vs. equal-width types.
1303         */
1304        size = PAGE_ALIGN(size);
1305        while (vma && (loff_t)(vma->vm_end - addr) <= size) {
1306                next = vma->vm_next;
1307
1308                /* finding a matching vma now does not alter retval */
1309                if ((vma->vm_ops == &shm_vm_ops) &&
1310                    ((vma->vm_start - addr)/PAGE_SIZE == vma->vm_pgoff) &&
1311                    (vma->vm_file == file))
1312                        do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1313                vma = next;
1314        }
1315
1316#else /* CONFIG_MMU */
1317        /* under NOMMU conditions, the exact address to be destroyed must be
1318         * given */
1319        if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
1320                do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
1321                retval = 0;
1322        }
1323
1324#endif
1325
1326        up_write(&mm->mmap_sem);
1327        return retval;
1328}
1329
1330#ifdef CONFIG_PROC_FS
1331static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
1332{
1333        struct user_namespace *user_ns = seq_user_ns(s);
1334        struct shmid_kernel *shp = it;
1335        unsigned long rss = 0, swp = 0;
1336
1337        shm_add_rss_swap(shp, &rss, &swp);
1338
1339#if BITS_PER_LONG <= 32
1340#define SIZE_SPEC "%10lu"
1341#else
1342#define SIZE_SPEC "%21lu"
1343#endif
1344
1345        return seq_printf(s,
1346                          "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
1347                          "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
1348                          SIZE_SPEC " " SIZE_SPEC "\n",
1349                          shp->shm_perm.key,
1350                          shp->shm_perm.id,
1351                          shp->shm_perm.mode,
1352                          shp->shm_segsz,
1353                          shp->shm_cprid,
1354                          shp->shm_lprid,
1355                          shp->shm_nattch,
1356                          from_kuid_munged(user_ns, shp->shm_perm.uid),
1357                          from_kgid_munged(user_ns, shp->shm_perm.gid),
1358                          from_kuid_munged(user_ns, shp->shm_perm.cuid),
1359                          from_kgid_munged(user_ns, shp->shm_perm.cgid),
1360                          shp->shm_atim,
1361                          shp->shm_dtim,
1362                          shp->shm_ctim,
1363                          rss * PAGE_SIZE,
1364                          swp * PAGE_SIZE);
1365}
1366#endif
1367
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