The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_shm.c

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    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: releng/9.2/sys/kern/sysv_shm.c 232117 2012-02-24 17:50:23Z alc $");
   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);

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