sys/kern/sysv_shm.c

   1 /*      $NetBSD: sysv_shm.c,v 1.23 1994/07/04 23:25:12 glass Exp $      */
   2 /*-
   3  * Copyright (c) 1994 Adam Glass and Charles Hannum.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Adam Glass and Charles
  16  *      Hannum.
  17  * 4. The names of the authors may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 /*-
  32  * Copyright (c) 2003-2005 McAfee, Inc.
  33  * All rights reserved.
  34  *
  35  * This software was developed for the FreeBSD Project in part by McAfee
  36  * Research, the Security Research Division of McAfee, Inc under DARPA/SPAWAR
  37  * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS research
  38  * program.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  */
  61
  62 #include <sys/cdefs.h>
  63 __FBSDID("$FreeBSD$");
  64
  65 #include "opt_compat.h"
  66 #include "opt_sysvipc.h"
  67
  68 #include <sys/param.h>
  69 #include <sys/systm.h>
  70 #include <sys/kernel.h>
  71 #include <sys/limits.h>
  72 #include <sys/lock.h>
  73 #include <sys/sysctl.h>
  74 #include <sys/shm.h>
  75 #include <sys/proc.h>
  76 #include <sys/malloc.h>
  77 #include <sys/mman.h>
  78 #include <sys/module.h>
  79 #include <sys/mutex.h>
  80 #include <sys/racct.h>
  81 #include <sys/resourcevar.h>
  82 #include <sys/stat.h>
  83 #include <sys/syscall.h>
  84 #include <sys/syscallsubr.h>
  85 #include <sys/sysent.h>
  86 #include <sys/sysproto.h>
  87 #include <sys/jail.h>
  88
  89 #include <security/mac/mac_framework.h>
  90
  91 #include <vm/vm.h>
  92 #include <vm/vm_param.h>
  93 #include <vm/pmap.h>
  94 #include <vm/vm_object.h>
  95 #include <vm/vm_map.h>
  96 #include <vm/vm_page.h>
  97 #include <vm/vm_pager.h>
  98
  99 FEATURE(sysv_shm, "System V shared memory segments support");
 100
 101 static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
 102
 103 static int shmget_allocate_segment(struct thread *td,
 104     struct shmget_args *uap, int mode);
 105 static int shmget_existing(struct thread *td, struct shmget_args *uap,
 106     int mode, int segnum);
 107
 108 #define SHMSEG_FREE             0x0200
 109 #define SHMSEG_REMOVED          0x0400
 110 #define SHMSEG_ALLOCATED        0x0800
 111 #define SHMSEG_WANTED           0x1000
 112
 113 static int shm_last_free, shm_nused, shmalloced;
 114 vm_size_t shm_committed;
 115 static struct shmid_kernel      *shmsegs;
 116
 117 struct shmmap_state {
 118         vm_offset_t va;
 119         int shmid;
 120 };
 121
 122 static void shm_deallocate_segment(struct shmid_kernel *);
 123 static int shm_find_segment_by_key(key_t);
 124 static struct shmid_kernel *shm_find_segment_by_shmid(int);
 125 static struct shmid_kernel *shm_find_segment_by_shmidx(int);
 126 static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
 127 static void shmrealloc(void);
 128 static int shminit(void);
 129 static int sysvshm_modload(struct module *, int, void *);
 130 static int shmunload(void);
 131 static void shmexit_myhook(struct vmspace *vm);
 132 static void shmfork_myhook(struct proc *p1, struct proc *p2);
 133 static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
 134
 135 /*
 136  * Tuneable values.
 137  */
 138 #ifndef SHMMAXPGS
 139 #define SHMMAXPGS       131072  /* Note: sysv shared memory is swap backed. */
 140 #endif
 141 #ifndef SHMMAX
 142 #define SHMMAX  (SHMMAXPGS*PAGE_SIZE)
 143 #endif
 144 #ifndef SHMMIN
 145 #define SHMMIN  1
 146 #endif
 147 #ifndef SHMMNI
 148 #define SHMMNI  192
 149 #endif
 150 #ifndef SHMSEG
 151 #define SHMSEG  128
 152 #endif
 153 #ifndef SHMALL
 154 #define SHMALL  (SHMMAXPGS)
 155 #endif
 156
 157 struct  shminfo shminfo = {
 158         SHMMAX,
 159         SHMMIN,
 160         SHMMNI,
 161         SHMSEG,
 162         SHMALL
 163 };
 164
 165 static int shm_use_phys;
 166 static int shm_allow_removed;
 167
 168 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
 169     "Maximum shared memory segment size");
 170 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
 171     "Minimum shared memory segment size");
 172 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
 173     "Number of shared memory identifiers");
 174 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
 175     "Number of segments per process");
 176 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
 177     "Maximum number of pages available for shared memory");
 178 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
 179     &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
 180 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW,
 181     &shm_allow_removed, 0,
 182     "Enable/Disable attachment to attached segments marked for removal");
 183 SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD,
 184     NULL, 0, sysctl_shmsegs, "",
 185     "Current number of shared memory segments allocated");
 186
 187 static int
 188 shm_find_segment_by_key(key)
 189         key_t key;
 190 {
 191         int i;
 192
 193         for (i = 0; i < shmalloced; i++)
 194                 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
 195                     shmsegs[i].u.shm_perm.key == key)
 196                         return (i);
 197         return (-1);
 198 }
 199
 200 static struct shmid_kernel *
 201 shm_find_segment_by_shmid(int shmid)
 202 {
 203         int segnum;
 204         struct shmid_kernel *shmseg;
 205
 206         segnum = IPCID_TO_IX(shmid);
 207         if (segnum < 0 || segnum >= shmalloced)
 208                 return (NULL);
 209         shmseg = &shmsegs[segnum];
 210         if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
 211             (!shm_allow_removed &&
 212              (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
 213             shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid))
 214                 return (NULL);
 215         return (shmseg);
 216 }
 217
 218 static struct shmid_kernel *
 219 shm_find_segment_by_shmidx(int segnum)
 220 {
 221         struct shmid_kernel *shmseg;
 222
 223         if (segnum < 0 || segnum >= shmalloced)
 224                 return (NULL);
 225         shmseg = &shmsegs[segnum];
 226         if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
 227             (!shm_allow_removed &&
 228              (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0))
 229                 return (NULL);
 230         return (shmseg);
 231 }
 232
 233 static void
 234 shm_deallocate_segment(shmseg)
 235         struct shmid_kernel *shmseg;
 236 {
 237         vm_size_t size;
 238
 239         GIANT_REQUIRED;
 240
 241         vm_object_deallocate(shmseg->object);
 242         shmseg->object = NULL;
 243         size = round_page(shmseg->u.shm_segsz);
 244         shm_committed -= btoc(size);
 245         shm_nused--;
 246         shmseg->u.shm_perm.mode = SHMSEG_FREE;
 247 #ifdef MAC
 248         mac_sysvshm_cleanup(shmseg);
 249 #endif
 250         racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
 251         racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
 252         crfree(shmseg->cred);
 253         shmseg->cred = NULL;
 254 }
 255
 256 static int
 257 shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
 258 {
 259         struct shmid_kernel *shmseg;
 260         int segnum, result;
 261         vm_size_t size;
 262
 263         GIANT_REQUIRED;
 264
 265         segnum = IPCID_TO_IX(shmmap_s->shmid);
 266         shmseg = &shmsegs[segnum];
 267         size = round_page(shmseg->u.shm_segsz);
 268         result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
 269         if (result != KERN_SUCCESS)
 270                 return (EINVAL);
 271         shmmap_s->shmid = -1;
 272         shmseg->u.shm_dtime = time_second;
 273         if ((--shmseg->u.shm_nattch <= 0) &&
 274             (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
 275                 shm_deallocate_segment(shmseg);
 276                 shm_last_free = segnum;
 277         }
 278         return (0);
 279 }
 280
 281 #ifndef _SYS_SYSPROTO_H_
 282 struct shmdt_args {
 283         const void *shmaddr;
 284 };
 285 #endif
 286 int
 287 sys_shmdt(td, uap)
 288         struct thread *td;
 289         struct shmdt_args *uap;
 290 {
 291         struct proc *p = td->td_proc;
 292         struct shmmap_state *shmmap_s;
 293 #ifdef MAC
 294         struct shmid_kernel *shmsegptr;
 295 #endif
 296         int i;
 297         int error = 0;
 298
 299         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
 300                 return (ENOSYS);
 301         mtx_lock(&Giant);
 302         shmmap_s = p->p_vmspace->vm_shm;
 303         if (shmmap_s == NULL) {
 304                 error = EINVAL;
 305                 goto done2;
 306         }
 307         for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
 308                 if (shmmap_s->shmid != -1 &&
 309                     shmmap_s->va == (vm_offset_t)uap->shmaddr) {
 310                         break;
 311                 }
 312         }
 313         if (i == shminfo.shmseg) {
 314                 error = EINVAL;
 315                 goto done2;
 316         }
 317 #ifdef MAC
 318         shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
 319         error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
 320         if (error != 0)
 321                 goto done2;
 322 #endif
 323         error = shm_delete_mapping(p->p_vmspace, shmmap_s);
 324 done2:
 325         mtx_unlock(&Giant);
 326         return (error);
 327 }
 328
 329 #ifndef _SYS_SYSPROTO_H_
 330 struct shmat_args {
 331         int shmid;
 332         const void *shmaddr;
 333         int shmflg;
 334 };
 335 #endif
 336 int
 337 kern_shmat(td, shmid, shmaddr, shmflg)
 338         struct thread *td;
 339         int shmid;
 340         const void *shmaddr;
 341         int shmflg;
 342 {
 343         struct proc *p = td->td_proc;
 344         int i, flags;
 345         struct shmid_kernel *shmseg;
 346         struct shmmap_state *shmmap_s = NULL;
 347         vm_offset_t attach_va;
 348         vm_prot_t prot;
 349         vm_size_t size;
 350         int rv;
 351         int error = 0;
 352
 353         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
 354                 return (ENOSYS);
 355         mtx_lock(&Giant);
 356         shmmap_s = p->p_vmspace->vm_shm;
 357         if (shmmap_s == NULL) {
 358                 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
 359                     M_SHM, M_WAITOK);
 360                 for (i = 0; i < shminfo.shmseg; i++)
 361                         shmmap_s[i].shmid = -1;
 362                 p->p_vmspace->vm_shm = shmmap_s;
 363         }
 364         shmseg = shm_find_segment_by_shmid(shmid);
 365         if (shmseg == NULL) {
 366                 error = EINVAL;
 367                 goto done2;
 368         }
 369         error = ipcperm(td, &shmseg->u.shm_perm,
 370             (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
 371         if (error)
 372                 goto done2;
 373 #ifdef MAC
 374         error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
 375         if (error != 0)
 376                 goto done2;
 377 #endif
 378         for (i = 0; i < shminfo.shmseg; i++) {
 379                 if (shmmap_s->shmid == -1)
 380                         break;
 381                 shmmap_s++;
 382         }
 383         if (i >= shminfo.shmseg) {
 384                 error = EMFILE;
 385                 goto done2;
 386         }
 387         size = round_page(shmseg->u.shm_segsz);
 388         prot = VM_PROT_READ;
 389         if ((shmflg & SHM_RDONLY) == 0)
 390                 prot |= VM_PROT_WRITE;
 391         flags = MAP_ANON | MAP_SHARED;
 392         if (shmaddr) {
 393                 flags |= MAP_FIXED;
 394                 if (shmflg & SHM_RND) {
 395                         attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1);
 396                 } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) {
 397                         attach_va = (vm_offset_t)shmaddr;
 398                 } else {
 399                         error = EINVAL;
 400                         goto done2;
 401                 }
 402         } else {
 403                 /*
 404                  * This is just a hint to vm_map_find() about where to
 405                  * put it.
 406                  */
 407                 PROC_LOCK(p);
 408                 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
 409                     lim_max(p, RLIMIT_DATA));
 410                 PROC_UNLOCK(p);
 411         }
 412
 413         vm_object_reference(shmseg->object);
 414         rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
 415             0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
 416             VMFS_ANY_SPACE, prot, prot, MAP_INHERIT_SHARE);
 417         if (rv != KERN_SUCCESS) {
 418                 vm_object_deallocate(shmseg->object);
 419                 error = ENOMEM;
 420                 goto done2;
 421         }
 422
 423         shmmap_s->va = attach_va;
 424         shmmap_s->shmid = shmid;
 425         shmseg->u.shm_lpid = p->p_pid;
 426         shmseg->u.shm_atime = time_second;
 427         shmseg->u.shm_nattch++;
 428         td->td_retval[0] = attach_va;
 429 done2:
 430         mtx_unlock(&Giant);
 431         return (error);
 432 }
 433
 434 int
 435 sys_shmat(td, uap)
 436         struct thread *td;
 437         struct shmat_args *uap;
 438 {
 439         return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg);
 440 }
 441
 442 int
 443 kern_shmctl(td, shmid, cmd, buf, bufsz)
 444         struct thread *td;
 445         int shmid;
 446         int cmd;
 447         void *buf;
 448         size_t *bufsz;
 449 {
 450         int error = 0;
 451         struct shmid_kernel *shmseg;
 452
 453         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
 454                 return (ENOSYS);
 455
 456         mtx_lock(&Giant);
 457         switch (cmd) {
 458         /*
 459          * It is possible that kern_shmctl is being called from the Linux ABI
 460          * layer, in which case, we will need to implement IPC_INFO.  It should
 461          * be noted that other shmctl calls will be funneled through here for
 462          * Linix binaries as well.
 463          *
 464          * NB: The Linux ABI layer will convert this data to structure(s) more
 465          * consistent with the Linux ABI.
 466          */
 467         case IPC_INFO:
 468                 memcpy(buf, &shminfo, sizeof(shminfo));
 469                 if (bufsz)
 470                         *bufsz = sizeof(shminfo);
 471                 td->td_retval[0] = shmalloced;
 472                 goto done2;
 473         case SHM_INFO: {
 474                 struct shm_info shm_info;
 475                 shm_info.used_ids = shm_nused;
 476                 shm_info.shm_rss = 0;   /*XXX where to get from ? */
 477                 shm_info.shm_tot = 0;   /*XXX where to get from ? */
 478                 shm_info.shm_swp = 0;   /*XXX where to get from ? */
 479                 shm_info.swap_attempts = 0;     /*XXX where to get from ? */
 480                 shm_info.swap_successes = 0;    /*XXX where to get from ? */
 481                 memcpy(buf, &shm_info, sizeof(shm_info));
 482                 if (bufsz)
 483                         *bufsz = sizeof(shm_info);
 484                 td->td_retval[0] = shmalloced;
 485                 goto done2;
 486         }
 487         }
 488         if (cmd == SHM_STAT)
 489                 shmseg = shm_find_segment_by_shmidx(shmid);
 490         else
 491                 shmseg = shm_find_segment_by_shmid(shmid);
 492         if (shmseg == NULL) {
 493                 error = EINVAL;
 494                 goto done2;
 495         }
 496 #ifdef MAC
 497         error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
 498         if (error != 0)
 499                 goto done2;
 500 #endif
 501         switch (cmd) {
 502         case SHM_STAT:
 503         case IPC_STAT:
 504                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
 505                 if (error)
 506                         goto done2;
 507                 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds));
 508                 if (bufsz)
 509                         *bufsz = sizeof(struct shmid_ds);
 510                 if (cmd == SHM_STAT)
 511                         td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm);
 512                 break;
 513         case IPC_SET: {
 514                 struct shmid_ds *shmid;
 515
 516                 shmid = (struct shmid_ds *)buf;
 517                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
 518                 if (error)
 519                         goto done2;
 520                 shmseg->u.shm_perm.uid = shmid->shm_perm.uid;
 521                 shmseg->u.shm_perm.gid = shmid->shm_perm.gid;
 522                 shmseg->u.shm_perm.mode =
 523                     (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
 524                     (shmid->shm_perm.mode & ACCESSPERMS);
 525                 shmseg->u.shm_ctime = time_second;
 526                 break;
 527         }
 528         case IPC_RMID:
 529                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
 530                 if (error)
 531                         goto done2;
 532                 shmseg->u.shm_perm.key = IPC_PRIVATE;
 533                 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
 534                 if (shmseg->u.shm_nattch <= 0) {
 535                         shm_deallocate_segment(shmseg);
 536                         shm_last_free = IPCID_TO_IX(shmid);
 537                 }
 538                 break;
 539 #if 0
 540         case SHM_LOCK:
 541         case SHM_UNLOCK:
 542 #endif
 543         default:
 544                 error = EINVAL;
 545                 break;
 546         }
 547 done2:
 548         mtx_unlock(&Giant);
 549         return (error);
 550 }
 551
 552 #ifndef _SYS_SYSPROTO_H_
 553 struct shmctl_args {
 554         int shmid;
 555         int cmd;
 556         struct shmid_ds *buf;
 557 };
 558 #endif
 559 int
 560 sys_shmctl(td, uap)
 561         struct thread *td;
 562         struct shmctl_args *uap;
 563 {
 564         int error = 0;
 565         struct shmid_ds buf;
 566         size_t bufsz;
 567
 568         /*
 569          * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
 570          * Linux binaries.  If we see the call come through the FreeBSD ABI,
 571          * return an error back to the user since we do not to support this.
 572          */
 573         if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
 574             uap->cmd == SHM_STAT)
 575                 return (EINVAL);
 576
 577         /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
 578         if (uap->cmd == IPC_SET) {
 579                 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
 580                         goto done;
 581         }
 582
 583         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
 584         if (error)
 585                 goto done;
 586
 587         /* Cases in which we need to copyout */
 588         switch (uap->cmd) {
 589         case IPC_STAT:
 590                 error = copyout(&buf, uap->buf, bufsz);
 591                 break;
 592         }
 593
 594 done:
 595         if (error) {
 596                 /* Invalidate the return value */
 597                 td->td_retval[0] = -1;
 598         }
 599         return (error);
 600 }
 601
 602
 603 static int
 604 shmget_existing(td, uap, mode, segnum)
 605         struct thread *td;
 606         struct shmget_args *uap;
 607         int mode;
 608         int segnum;
 609 {
 610         struct shmid_kernel *shmseg;
 611         int error;
 612
 613         shmseg = &shmsegs[segnum];
 614         if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
 615                 /*
 616                  * This segment is in the process of being allocated.  Wait
 617                  * until it's done, and look the key up again (in case the
 618                  * allocation failed or it was freed).
 619                  */
 620                 shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
 621                 error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0);
 622                 if (error)
 623                         return (error);
 624                 return (EAGAIN);
 625         }
 626         if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
 627                 return (EEXIST);
 628 #ifdef MAC
 629         error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
 630         if (error != 0)
 631                 return (error);
 632 #endif
 633         if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
 634                 return (EINVAL);
 635         td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
 636         return (0);
 637 }
 638
 639 static int
 640 shmget_allocate_segment(td, uap, mode)
 641         struct thread *td;
 642         struct shmget_args *uap;
 643         int mode;
 644 {
 645         int i, segnum, shmid;
 646         size_t size;
 647         struct ucred *cred = td->td_ucred;
 648         struct shmid_kernel *shmseg;
 649         vm_object_t shm_object;
 650
 651         GIANT_REQUIRED;
 652
 653         if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
 654                 return (EINVAL);
 655         if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
 656                 return (ENOSPC);
 657         size = round_page(uap->size);
 658         if (shm_committed + btoc(size) > shminfo.shmall)
 659                 return (ENOMEM);
 660         if (shm_last_free < 0) {
 661                 shmrealloc();   /* Maybe expand the shmsegs[] array. */
 662                 for (i = 0; i < shmalloced; i++)
 663                         if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
 664                                 break;
 665                 if (i == shmalloced)
 666                         return (ENOSPC);
 667                 segnum = i;
 668         } else  {
 669                 segnum = shm_last_free;
 670                 shm_last_free = -1;
 671         }
 672         shmseg = &shmsegs[segnum];
 673 #ifdef RACCT
 674         PROC_LOCK(td->td_proc);
 675         if (racct_add(td->td_proc, RACCT_NSHM, 1)) {
 676                 PROC_UNLOCK(td->td_proc);
 677                 return (ENOSPC);
 678         }
 679         if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) {
 680                 racct_sub(td->td_proc, RACCT_NSHM, 1);
 681                 PROC_UNLOCK(td->td_proc);
 682                 return (ENOMEM);
 683         }
 684         PROC_UNLOCK(td->td_proc);
 685 #endif
 686         /*
 687          * In case we sleep in malloc(), mark the segment present but deleted
 688          * so that noone else tries to create the same key.
 689          */
 690         shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
 691         shmseg->u.shm_perm.key = uap->key;
 692         shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
 693         shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
 694
 695         /*
 696          * We make sure that we have allocated a pager before we need
 697          * to.
 698          */
 699         shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
 700             0, size, VM_PROT_DEFAULT, 0, cred);
 701         if (shm_object == NULL) {
 702 #ifdef RACCT
 703                 PROC_LOCK(td->td_proc);
 704                 racct_sub(td->td_proc, RACCT_NSHM, 1);
 705                 racct_sub(td->td_proc, RACCT_SHMSIZE, size);
 706                 PROC_UNLOCK(td->td_proc);
 707 #endif
 708                 return (ENOMEM);
 709         }
 710         VM_OBJECT_LOCK(shm_object);
 711         vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
 712         vm_object_set_flag(shm_object, OBJ_NOSPLIT);
 713         VM_OBJECT_UNLOCK(shm_object);
 714
 715         shmseg->object = shm_object;
 716         shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
 717         shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
 718         shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
 719             (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
 720         shmseg->cred = crhold(cred);
 721         shmseg->u.shm_segsz = uap->size;
 722         shmseg->u.shm_cpid = td->td_proc->p_pid;
 723         shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
 724         shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
 725 #ifdef MAC
 726         mac_sysvshm_create(cred, shmseg);
 727 #endif
 728         shmseg->u.shm_ctime = time_second;
 729         shm_committed += btoc(size);
 730         shm_nused++;
 731         if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
 732                 /*
 733                  * Somebody else wanted this key while we were asleep.  Wake
 734                  * them up now.
 735                  */
 736                 shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
 737                 wakeup(shmseg);
 738         }
 739         td->td_retval[0] = shmid;
 740         return (0);
 741 }
 742
 743 #ifndef _SYS_SYSPROTO_H_
 744 struct shmget_args {
 745         key_t key;
 746         size_t size;
 747         int shmflg;
 748 };
 749 #endif
 750 int
 751 sys_shmget(td, uap)
 752         struct thread *td;
 753         struct shmget_args *uap;
 754 {
 755         int segnum, mode;
 756         int error;
 757
 758         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
 759                 return (ENOSYS);
 760         mtx_lock(&Giant);
 761         mode = uap->shmflg & ACCESSPERMS;
 762         if (uap->key != IPC_PRIVATE) {
 763         again:
 764                 segnum = shm_find_segment_by_key(uap->key);
 765                 if (segnum >= 0) {
 766                         error = shmget_existing(td, uap, mode, segnum);
 767                         if (error == EAGAIN)
 768                                 goto again;
 769                         goto done2;
 770                 }
 771                 if ((uap->shmflg & IPC_CREAT) == 0) {
 772                         error = ENOENT;
 773                         goto done2;
 774                 }
 775         }
 776         error = shmget_allocate_segment(td, uap, mode);
 777 done2:
 778         mtx_unlock(&Giant);
 779         return (error);
 780 }
 781
 782 static void
 783 shmfork_myhook(p1, p2)
 784         struct proc *p1, *p2;
 785 {
 786         struct shmmap_state *shmmap_s;
 787         size_t size;
 788         int i;
 789
 790         mtx_lock(&Giant);
 791         size = shminfo.shmseg * sizeof(struct shmmap_state);
 792         shmmap_s = malloc(size, M_SHM, M_WAITOK);
 793         bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
 794         p2->p_vmspace->vm_shm = shmmap_s;
 795         for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
 796                 if (shmmap_s->shmid != -1)
 797                         shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
 798         mtx_unlock(&Giant);
 799 }
 800
 801 static void
 802 shmexit_myhook(struct vmspace *vm)
 803 {
 804         struct shmmap_state *base, *shm;
 805         int i;
 806
 807         if ((base = vm->vm_shm) != NULL) {
 808                 vm->vm_shm = NULL;
 809                 mtx_lock(&Giant);
 810                 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
 811                         if (shm->shmid != -1)
 812                                 shm_delete_mapping(vm, shm);
 813                 }
 814                 mtx_unlock(&Giant);
 815                 free(base, M_SHM);
 816         }
 817 }
 818
 819 static void
 820 shmrealloc(void)
 821 {
 822         int i;
 823         struct shmid_kernel *newsegs;
 824
 825         if (shmalloced >= shminfo.shmmni)
 826                 return;
 827
 828         newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
 829         if (newsegs == NULL)
 830                 return;
 831         for (i = 0; i < shmalloced; i++)
 832                 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
 833         for (; i < shminfo.shmmni; i++) {
 834                 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
 835                 shmsegs[i].u.shm_perm.seq = 0;
 836 #ifdef MAC
 837                 mac_sysvshm_init(&shmsegs[i]);
 838 #endif
 839         }
 840         free(shmsegs, M_SHM);
 841         shmsegs = newsegs;
 842         shmalloced = shminfo.shmmni;
 843 }
 844
 845 static struct syscall_helper_data shm_syscalls[] = {
 846         SYSCALL_INIT_HELPER(shmat),
 847         SYSCALL_INIT_HELPER(shmctl),
 848         SYSCALL_INIT_HELPER(shmdt),
 849         SYSCALL_INIT_HELPER(shmget),
 850 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
 851     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
 852         SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl),
 853 #endif
 854 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
 855         SYSCALL_INIT_HELPER(shmsys),
 856 #endif
 857         SYSCALL_INIT_LAST
 858 };
 859
 860 #ifdef COMPAT_FREEBSD32
 861 #include <compat/freebsd32/freebsd32.h>
 862 #include <compat/freebsd32/freebsd32_ipc.h>
 863 #include <compat/freebsd32/freebsd32_proto.h>
 864 #include <compat/freebsd32/freebsd32_signal.h>
 865 #include <compat/freebsd32/freebsd32_syscall.h>
 866 #include <compat/freebsd32/freebsd32_util.h>
 867
 868 static struct syscall_helper_data shm32_syscalls[] = {
 869         SYSCALL32_INIT_HELPER_COMPAT(shmat),
 870         SYSCALL32_INIT_HELPER_COMPAT(shmdt),
 871         SYSCALL32_INIT_HELPER_COMPAT(shmget),
 872         SYSCALL32_INIT_HELPER(freebsd32_shmsys),
 873         SYSCALL32_INIT_HELPER(freebsd32_shmctl),
 874 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
 875     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
 876         SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl),
 877 #endif
 878         SYSCALL_INIT_LAST
 879 };
 880 #endif
 881
 882 static int
 883 shminit()
 884 {
 885         int i, error;
 886
 887 #ifndef BURN_BRIDGES
 888         if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
 889                 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
 890 #endif
 891         TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall);
 892
 893         /* Initialize shmmax dealing with possible overflow. */
 894         for (i = PAGE_SIZE; i > 0; i--) {
 895                 shminfo.shmmax = shminfo.shmall * i;
 896                 if (shminfo.shmmax >= shminfo.shmall)
 897                         break;
 898         }
 899
 900         TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
 901         TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
 902         TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
 903         TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys);
 904
 905         shmalloced = shminfo.shmmni;
 906         shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
 907         for (i = 0; i < shmalloced; i++) {
 908                 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
 909                 shmsegs[i].u.shm_perm.seq = 0;
 910 #ifdef MAC
 911                 mac_sysvshm_init(&shmsegs[i]);
 912 #endif
 913         }
 914         shm_last_free = 0;
 915         shm_nused = 0;
 916         shm_committed = 0;
 917         shmexit_hook = &shmexit_myhook;
 918         shmfork_hook = &shmfork_myhook;
 919
 920         error = syscall_helper_register(shm_syscalls);
 921         if (error != 0)
 922                 return (error);
 923 #ifdef COMPAT_FREEBSD32
 924         error = syscall32_helper_register(shm32_syscalls);
 925         if (error != 0)
 926                 return (error);
 927 #endif
 928         return (0);
 929 }
 930
 931 static int
 932 shmunload()
 933 {
 934         int i;
 935
 936         if (shm_nused > 0)
 937                 return (EBUSY);
 938
 939 #ifdef COMPAT_FREEBSD32
 940         syscall32_helper_unregister(shm32_syscalls);
 941 #endif
 942         syscall_helper_unregister(shm_syscalls);
 943
 944         for (i = 0; i < shmalloced; i++) {
 945 #ifdef MAC
 946                 mac_sysvshm_destroy(&shmsegs[i]);
 947 #endif
 948                 /*
 949                  * Objects might be still mapped into the processes
 950                  * address spaces.  Actual free would happen on the
 951                  * last mapping destruction.
 952                  */
 953                 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE)
 954                         vm_object_deallocate(shmsegs[i].object);
 955         }
 956         free(shmsegs, M_SHM);
 957         shmexit_hook = NULL;
 958         shmfork_hook = NULL;
 959         return (0);
 960 }
 961
 962 static int
 963 sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
 964 {
 965
 966         return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])));
 967 }
 968
 969 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
 970 struct oshmid_ds {
 971         struct  ipc_perm_old shm_perm;  /* operation perms */
 972         int     shm_segsz;              /* size of segment (bytes) */
 973         u_short shm_cpid;               /* pid, creator */
 974         u_short shm_lpid;               /* pid, last operation */
 975         short   shm_nattch;             /* no. of current attaches */
 976         time_t  shm_atime;              /* last attach time */
 977         time_t  shm_dtime;              /* last detach time */
 978         time_t  shm_ctime;              /* last change time */
 979         void    *shm_handle;            /* internal handle for shm segment */
 980 };
 981
 982 struct oshmctl_args {
 983         int shmid;
 984         int cmd;
 985         struct oshmid_ds *ubuf;
 986 };
 987
 988 static int
 989 oshmctl(struct thread *td, struct oshmctl_args *uap)
 990 {
 991 #ifdef COMPAT_43
 992         int error = 0;
 993         struct shmid_kernel *shmseg;
 994         struct oshmid_ds outbuf;
 995
 996         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
 997                 return (ENOSYS);
 998         mtx_lock(&Giant);
 999         shmseg = shm_find_segment_by_shmid(uap->shmid);
1000         if (shmseg == NULL) {
1001                 error = EINVAL;
1002                 goto done2;
1003         }
1004         switch (uap->cmd) {
1005         case IPC_STAT:
1006                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
1007                 if (error)
1008                         goto done2;
1009 #ifdef MAC
1010                 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
1011                 if (error != 0)
1012                         goto done2;
1013 #endif
1014                 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
1015                 outbuf.shm_segsz = shmseg->u.shm_segsz;
1016                 outbuf.shm_cpid = shmseg->u.shm_cpid;
1017                 outbuf.shm_lpid = shmseg->u.shm_lpid;
1018                 outbuf.shm_nattch = shmseg->u.shm_nattch;
1019                 outbuf.shm_atime = shmseg->u.shm_atime;
1020                 outbuf.shm_dtime = shmseg->u.shm_dtime;
1021                 outbuf.shm_ctime = shmseg->u.shm_ctime;
1022                 outbuf.shm_handle = shmseg->object;
1023                 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf));
1024                 if (error)
1025                         goto done2;
1026                 break;
1027         default:
1028                 error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap);
1029                 break;
1030         }
1031 done2:
1032         mtx_unlock(&Giant);
1033         return (error);
1034 #else
1035         return (EINVAL);
1036 #endif
1037 }
1038
1039 /* XXX casting to (sy_call_t *) is bogus, as usual. */
1040 static sy_call_t *shmcalls[] = {
1041         (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl,
1042         (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget,
1043         (sy_call_t *)freebsd7_shmctl
1044 };
1045
1046 int
1047 sys_shmsys(td, uap)
1048         struct thread *td;
1049         /* XXX actually varargs. */
1050         struct shmsys_args /* {
1051                 int     which;
1052                 int     a2;
1053                 int     a3;
1054                 int     a4;
1055         } */ *uap;
1056 {
1057         int error;
1058
1059         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
1060                 return (ENOSYS);
1061         if (uap->which < 0 ||
1062             uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0]))
1063                 return (EINVAL);
1064         mtx_lock(&Giant);
1065         error = (*shmcalls[uap->which])(td, &uap->a2);
1066         mtx_unlock(&Giant);
1067         return (error);
1068 }
1069
1070 #endif  /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
1071
1072 #ifdef COMPAT_FREEBSD32
1073
1074 int
1075 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap)
1076 {
1077
1078 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1079     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1080         switch (uap->which) {
1081         case 0: {       /* shmat */
1082                 struct shmat_args ap;
1083
1084                 ap.shmid = uap->a2;
1085                 ap.shmaddr = PTRIN(uap->a3);
1086                 ap.shmflg = uap->a4;
1087                 return (sysent[SYS_shmat].sy_call(td, &ap));
1088         }
1089         case 2: {       /* shmdt */
1090                 struct shmdt_args ap;
1091
1092                 ap.shmaddr = PTRIN(uap->a2);
1093                 return (sysent[SYS_shmdt].sy_call(td, &ap));
1094         }
1095         case 3: {       /* shmget */
1096                 struct shmget_args ap;
1097
1098                 ap.key = uap->a2;
1099                 ap.size = uap->a3;
1100                 ap.shmflg = uap->a4;
1101                 return (sysent[SYS_shmget].sy_call(td, &ap));
1102         }
1103         case 4: {       /* shmctl */
1104                 struct freebsd7_freebsd32_shmctl_args ap;
1105
1106                 ap.shmid = uap->a2;
1107                 ap.cmd = uap->a3;
1108                 ap.buf = PTRIN(uap->a4);
1109                 return (freebsd7_freebsd32_shmctl(td, &ap));
1110         }
1111         case 1:         /* oshmctl */
1112         default:
1113                 return (EINVAL);
1114         }
1115 #else
1116         return (nosys(td, NULL));
1117 #endif
1118 }
1119
1120 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1121     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1122 int
1123 freebsd7_freebsd32_shmctl(struct thread *td,
1124     struct freebsd7_freebsd32_shmctl_args *uap)
1125 {
1126         int error = 0;
1127         union {
1128                 struct shmid_ds shmid_ds;
1129                 struct shm_info shm_info;
1130                 struct shminfo shminfo;
1131         } u;
1132         union {
1133                 struct shmid_ds32_old shmid_ds32;
1134                 struct shm_info32 shm_info32;
1135                 struct shminfo32 shminfo32;
1136         } u32;
1137         size_t sz;
1138
1139         if (uap->cmd == IPC_SET) {
1140                 if ((error = copyin(uap->buf, &u32.shmid_ds32,
1141                     sizeof(u32.shmid_ds32))))
1142                         goto done;
1143                 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm,
1144                     &u.shmid_ds.shm_perm);
1145                 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
1146                 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
1147                 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
1148                 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
1149                 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
1150                 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
1151                 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
1152         }
1153
1154         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
1155         if (error)
1156                 goto done;
1157
1158         /* Cases in which we need to copyout */
1159         switch (uap->cmd) {
1160         case IPC_INFO:
1161                 CP(u.shminfo, u32.shminfo32, shmmax);
1162                 CP(u.shminfo, u32.shminfo32, shmmin);
1163                 CP(u.shminfo, u32.shminfo32, shmmni);
1164                 CP(u.shminfo, u32.shminfo32, shmseg);
1165                 CP(u.shminfo, u32.shminfo32, shmall);
1166                 error = copyout(&u32.shminfo32, uap->buf,
1167                     sizeof(u32.shminfo32));
1168                 break;
1169         case SHM_INFO:
1170                 CP(u.shm_info, u32.shm_info32, used_ids);
1171                 CP(u.shm_info, u32.shm_info32, shm_rss);
1172                 CP(u.shm_info, u32.shm_info32, shm_tot);
1173                 CP(u.shm_info, u32.shm_info32, shm_swp);
1174                 CP(u.shm_info, u32.shm_info32, swap_attempts);
1175                 CP(u.shm_info, u32.shm_info32, swap_successes);
1176                 error = copyout(&u32.shm_info32, uap->buf,
1177                     sizeof(u32.shm_info32));
1178                 break;
1179         case SHM_STAT:
1180         case IPC_STAT:
1181                 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm,
1182                     &u32.shmid_ds32.shm_perm);
1183                 if (u.shmid_ds.shm_segsz > INT32_MAX)
1184                         u32.shmid_ds32.shm_segsz = INT32_MAX;
1185                 else
1186                         CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
1187                 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
1188                 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
1189                 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
1190                 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
1191                 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
1192                 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
1193                 u32.shmid_ds32.shm_internal = 0;
1194                 error = copyout(&u32.shmid_ds32, uap->buf,
1195                     sizeof(u32.shmid_ds32));
1196                 break;
1197         }
1198
1199 done:
1200         if (error) {
1201                 /* Invalidate the return value */
1202                 td->td_retval[0] = -1;
1203         }
1204         return (error);
1205 }
1206 #endif
1207
1208 int
1209 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap)
1210 {
1211         int error = 0;
1212         union {
1213                 struct shmid_ds shmid_ds;
1214                 struct shm_info shm_info;
1215                 struct shminfo shminfo;
1216         } u;
1217         union {
1218                 struct shmid_ds32 shmid_ds32;
1219                 struct shm_info32 shm_info32;
1220                 struct shminfo32 shminfo32;
1221         } u32;
1222         size_t sz;
1223
1224         if (uap->cmd == IPC_SET) {
1225                 if ((error = copyin(uap->buf, &u32.shmid_ds32,
1226                     sizeof(u32.shmid_ds32))))
1227                         goto done;
1228                 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm,
1229                     &u.shmid_ds.shm_perm);
1230                 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
1231                 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
1232                 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
1233                 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
1234                 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
1235                 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
1236                 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
1237         }
1238
1239         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
1240         if (error)
1241                 goto done;
1242
1243         /* Cases in which we need to copyout */
1244         switch (uap->cmd) {
1245         case IPC_INFO:
1246                 CP(u.shminfo, u32.shminfo32, shmmax);
1247                 CP(u.shminfo, u32.shminfo32, shmmin);
1248                 CP(u.shminfo, u32.shminfo32, shmmni);
1249                 CP(u.shminfo, u32.shminfo32, shmseg);
1250                 CP(u.shminfo, u32.shminfo32, shmall);
1251                 error = copyout(&u32.shminfo32, uap->buf,
1252                     sizeof(u32.shminfo32));
1253                 break;
1254         case SHM_INFO:
1255                 CP(u.shm_info, u32.shm_info32, used_ids);
1256                 CP(u.shm_info, u32.shm_info32, shm_rss);
1257                 CP(u.shm_info, u32.shm_info32, shm_tot);
1258                 CP(u.shm_info, u32.shm_info32, shm_swp);
1259                 CP(u.shm_info, u32.shm_info32, swap_attempts);
1260                 CP(u.shm_info, u32.shm_info32, swap_successes);
1261                 error = copyout(&u32.shm_info32, uap->buf,
1262                     sizeof(u32.shm_info32));
1263                 break;
1264         case SHM_STAT:
1265         case IPC_STAT:
1266                 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm,
1267                     &u32.shmid_ds32.shm_perm);
1268                 if (u.shmid_ds.shm_segsz > INT32_MAX)
1269                         u32.shmid_ds32.shm_segsz = INT32_MAX;
1270                 else
1271                         CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
1272                 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
1273                 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
1274                 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
1275                 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
1276                 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
1277                 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
1278                 error = copyout(&u32.shmid_ds32, uap->buf,
1279                     sizeof(u32.shmid_ds32));
1280                 break;
1281         }
1282
1283 done:
1284         if (error) {
1285                 /* Invalidate the return value */
1286                 td->td_retval[0] = -1;
1287         }
1288         return (error);
1289 }
1290 #endif
1291
1292 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
1293     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
1294
1295 #ifndef CP
1296 #define CP(src, dst, fld)       do { (dst).fld = (src).fld; } while (0)
1297 #endif
1298
1299 #ifndef _SYS_SYSPROTO_H_
1300 struct freebsd7_shmctl_args {
1301         int shmid;
1302         int cmd;
1303         struct shmid_ds_old *buf;
1304 };
1305 #endif
1306 int
1307 freebsd7_shmctl(td, uap)
1308         struct thread *td;
1309         struct freebsd7_shmctl_args *uap;
1310 {
1311         int error = 0;
1312         struct shmid_ds_old old;
1313         struct shmid_ds buf;
1314         size_t bufsz;
1315
1316         /*
1317          * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
1318          * Linux binaries.  If we see the call come through the FreeBSD ABI,
1319          * return an error back to the user since we do not to support this.
1320          */
1321         if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
1322             uap->cmd == SHM_STAT)
1323                 return (EINVAL);
1324
1325         /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
1326         if (uap->cmd == IPC_SET) {
1327                 if ((error = copyin(uap->buf, &old, sizeof(old))))
1328                         goto done;
1329                 ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
1330                 CP(old, buf, shm_segsz);
1331                 CP(old, buf, shm_lpid);
1332                 CP(old, buf, shm_cpid);
1333                 CP(old, buf, shm_nattch);
1334                 CP(old, buf, shm_atime);
1335                 CP(old, buf, shm_dtime);
1336                 CP(old, buf, shm_ctime);
1337         }
1338
1339         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
1340         if (error)
1341                 goto done;
1342
1343         /* Cases in which we need to copyout */
1344         switch (uap->cmd) {
1345         case IPC_STAT:
1346                 ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
1347                 if (buf.shm_segsz > INT_MAX)
1348                         old.shm_segsz = INT_MAX;
1349                 else
1350                         CP(buf, old, shm_segsz);
1351                 CP(buf, old, shm_lpid);
1352                 CP(buf, old, shm_cpid);
1353                 if (buf.shm_nattch > SHRT_MAX)
1354                         old.shm_nattch = SHRT_MAX;
1355                 else
1356                         CP(buf, old, shm_nattch);
1357                 CP(buf, old, shm_atime);
1358                 CP(buf, old, shm_dtime);
1359                 CP(buf, old, shm_ctime);
1360                 old.shm_internal = NULL;
1361                 error = copyout(&old, uap->buf, sizeof(old));
1362                 break;
1363         }
1364
1365 done:
1366         if (error) {
1367                 /* Invalidate the return value */
1368                 td->td_retval[0] = -1;
1369         }
1370         return (error);
1371 }
1372
1373 #endif  /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
1374            COMPAT_FREEBSD7 */
1375
1376 static int
1377 sysvshm_modload(struct module *module, int cmd, void *arg)
1378 {
1379         int error = 0;
1380
1381         switch (cmd) {
1382         case MOD_LOAD:
1383                 error = shminit();
1384                 if (error != 0)
1385                         shmunload();
1386                 break;
1387         case MOD_UNLOAD:
1388                 error = shmunload();
1389                 break;
1390         case MOD_SHUTDOWN:
1391                 break;
1392         default:
1393                 error = EINVAL;
1394                 break;
1395         }
1396         return (error);
1397 }
1398
1399 static moduledata_t sysvshm_mod = {
1400         "sysvshm",
1401         &sysvshm_modload,
1402         NULL
1403 };
1404
1405 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
1406 MODULE_VERSION(sysvshm, 1);