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/10.1/sys/kern/sysv_shm.c 255426 2013-09-09 18:11:59Z jhb $");
   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/rwlock.h>
   83 #include <sys/stat.h>
   84 #include <sys/syscall.h>
   85 #include <sys/syscallsubr.h>
   86 #include <sys/sysent.h>
   87 #include <sys/sysproto.h>
   88 #include <sys/jail.h>
   89 
   90 #include <security/mac/mac_framework.h>
   91 
   92 #include <vm/vm.h>
   93 #include <vm/vm_param.h>
   94 #include <vm/pmap.h>
   95 #include <vm/vm_object.h>
   96 #include <vm/vm_map.h>
   97 #include <vm/vm_page.h>
   98 #include <vm/vm_pager.h>
   99 
  100 FEATURE(sysv_shm, "System V shared memory segments support");
  101 
  102 static MALLOC_DEFINE(M_SHM, "shm", "SVID compatible shared memory segments");
  103 
  104 static int shmget_allocate_segment(struct thread *td,
  105     struct shmget_args *uap, int mode);
  106 static int shmget_existing(struct thread *td, struct shmget_args *uap,
  107     int mode, int segnum);
  108 
  109 #define SHMSEG_FREE             0x0200
  110 #define SHMSEG_REMOVED          0x0400
  111 #define SHMSEG_ALLOCATED        0x0800
  112 #define SHMSEG_WANTED           0x1000
  113 
  114 static int shm_last_free, shm_nused, shmalloced;
  115 vm_size_t shm_committed;
  116 static struct shmid_kernel      *shmsegs;
  117 
  118 struct shmmap_state {
  119         vm_offset_t va;
  120         int shmid;
  121 };
  122 
  123 static void shm_deallocate_segment(struct shmid_kernel *);
  124 static int shm_find_segment_by_key(key_t);
  125 static struct shmid_kernel *shm_find_segment_by_shmid(int);
  126 static struct shmid_kernel *shm_find_segment_by_shmidx(int);
  127 static int shm_delete_mapping(struct vmspace *vm, struct shmmap_state *);
  128 static void shmrealloc(void);
  129 static int shminit(void);
  130 static int sysvshm_modload(struct module *, int, void *);
  131 static int shmunload(void);
  132 static void shmexit_myhook(struct vmspace *vm);
  133 static void shmfork_myhook(struct proc *p1, struct proc *p2);
  134 static int sysctl_shmsegs(SYSCTL_HANDLER_ARGS);
  135 
  136 /*
  137  * Tuneable values.
  138  */
  139 #ifndef SHMMAXPGS
  140 #define SHMMAXPGS       131072  /* Note: sysv shared memory is swap backed. */
  141 #endif
  142 #ifndef SHMMAX
  143 #define SHMMAX  (SHMMAXPGS*PAGE_SIZE)
  144 #endif
  145 #ifndef SHMMIN
  146 #define SHMMIN  1
  147 #endif
  148 #ifndef SHMMNI
  149 #define SHMMNI  192
  150 #endif
  151 #ifndef SHMSEG
  152 #define SHMSEG  128
  153 #endif
  154 #ifndef SHMALL
  155 #define SHMALL  (SHMMAXPGS)
  156 #endif
  157 
  158 struct  shminfo shminfo = {
  159         SHMMAX,
  160         SHMMIN,
  161         SHMMNI,
  162         SHMSEG,
  163         SHMALL
  164 };
  165 
  166 static int shm_use_phys;
  167 static int shm_allow_removed;
  168 
  169 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmax, CTLFLAG_RW, &shminfo.shmmax, 0,
  170     "Maximum shared memory segment size");
  171 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmin, CTLFLAG_RW, &shminfo.shmmin, 0,
  172     "Minimum shared memory segment size");
  173 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmmni, CTLFLAG_RDTUN, &shminfo.shmmni, 0,
  174     "Number of shared memory identifiers");
  175 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmseg, CTLFLAG_RDTUN, &shminfo.shmseg, 0,
  176     "Number of segments per process");
  177 SYSCTL_ULONG(_kern_ipc, OID_AUTO, shmall, CTLFLAG_RW, &shminfo.shmall, 0,
  178     "Maximum number of pages available for shared memory");
  179 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_use_phys, CTLFLAG_RW,
  180     &shm_use_phys, 0, "Enable/Disable locking of shared memory pages in core");
  181 SYSCTL_INT(_kern_ipc, OID_AUTO, shm_allow_removed, CTLFLAG_RW,
  182     &shm_allow_removed, 0,
  183     "Enable/Disable attachment to attached segments marked for removal");
  184 SYSCTL_PROC(_kern_ipc, OID_AUTO, shmsegs, CTLTYPE_OPAQUE | CTLFLAG_RD,
  185     NULL, 0, sysctl_shmsegs, "",
  186     "Current number of shared memory segments allocated");
  187 
  188 static int
  189 shm_find_segment_by_key(key)
  190         key_t key;
  191 {
  192         int i;
  193 
  194         for (i = 0; i < shmalloced; i++)
  195                 if ((shmsegs[i].u.shm_perm.mode & SHMSEG_ALLOCATED) &&
  196                     shmsegs[i].u.shm_perm.key == key)
  197                         return (i);
  198         return (-1);
  199 }
  200 
  201 static struct shmid_kernel *
  202 shm_find_segment_by_shmid(int shmid)
  203 {
  204         int segnum;
  205         struct shmid_kernel *shmseg;
  206 
  207         segnum = IPCID_TO_IX(shmid);
  208         if (segnum < 0 || segnum >= shmalloced)
  209                 return (NULL);
  210         shmseg = &shmsegs[segnum];
  211         if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
  212             (!shm_allow_removed &&
  213              (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0) ||
  214             shmseg->u.shm_perm.seq != IPCID_TO_SEQ(shmid))
  215                 return (NULL);
  216         return (shmseg);
  217 }
  218 
  219 static struct shmid_kernel *
  220 shm_find_segment_by_shmidx(int segnum)
  221 {
  222         struct shmid_kernel *shmseg;
  223 
  224         if (segnum < 0 || segnum >= shmalloced)
  225                 return (NULL);
  226         shmseg = &shmsegs[segnum];
  227         if ((shmseg->u.shm_perm.mode & SHMSEG_ALLOCATED) == 0 ||
  228             (!shm_allow_removed &&
  229              (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) != 0))
  230                 return (NULL);
  231         return (shmseg);
  232 }
  233 
  234 static void
  235 shm_deallocate_segment(shmseg)
  236         struct shmid_kernel *shmseg;
  237 {
  238         vm_size_t size;
  239 
  240         GIANT_REQUIRED;
  241 
  242         vm_object_deallocate(shmseg->object);
  243         shmseg->object = NULL;
  244         size = round_page(shmseg->u.shm_segsz);
  245         shm_committed -= btoc(size);
  246         shm_nused--;
  247         shmseg->u.shm_perm.mode = SHMSEG_FREE;
  248 #ifdef MAC
  249         mac_sysvshm_cleanup(shmseg);
  250 #endif
  251         racct_sub_cred(shmseg->cred, RACCT_NSHM, 1);
  252         racct_sub_cred(shmseg->cred, RACCT_SHMSIZE, size);
  253         crfree(shmseg->cred);
  254         shmseg->cred = NULL;
  255 }
  256 
  257 static int
  258 shm_delete_mapping(struct vmspace *vm, struct shmmap_state *shmmap_s)
  259 {
  260         struct shmid_kernel *shmseg;
  261         int segnum, result;
  262         vm_size_t size;
  263 
  264         GIANT_REQUIRED;
  265 
  266         segnum = IPCID_TO_IX(shmmap_s->shmid);
  267         shmseg = &shmsegs[segnum];
  268         size = round_page(shmseg->u.shm_segsz);
  269         result = vm_map_remove(&vm->vm_map, shmmap_s->va, shmmap_s->va + size);
  270         if (result != KERN_SUCCESS)
  271                 return (EINVAL);
  272         shmmap_s->shmid = -1;
  273         shmseg->u.shm_dtime = time_second;
  274         if ((--shmseg->u.shm_nattch <= 0) &&
  275             (shmseg->u.shm_perm.mode & SHMSEG_REMOVED)) {
  276                 shm_deallocate_segment(shmseg);
  277                 shm_last_free = segnum;
  278         }
  279         return (0);
  280 }
  281 
  282 #ifndef _SYS_SYSPROTO_H_
  283 struct shmdt_args {
  284         const void *shmaddr;
  285 };
  286 #endif
  287 int
  288 sys_shmdt(td, uap)
  289         struct thread *td;
  290         struct shmdt_args *uap;
  291 {
  292         struct proc *p = td->td_proc;
  293         struct shmmap_state *shmmap_s;
  294 #ifdef MAC
  295         struct shmid_kernel *shmsegptr;
  296 #endif
  297         int i;
  298         int error = 0;
  299 
  300         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
  301                 return (ENOSYS);
  302         mtx_lock(&Giant);
  303         shmmap_s = p->p_vmspace->vm_shm;
  304         if (shmmap_s == NULL) {
  305                 error = EINVAL;
  306                 goto done2;
  307         }
  308         for (i = 0; i < shminfo.shmseg; i++, shmmap_s++) {
  309                 if (shmmap_s->shmid != -1 &&
  310                     shmmap_s->va == (vm_offset_t)uap->shmaddr) {
  311                         break;
  312                 }
  313         }
  314         if (i == shminfo.shmseg) {
  315                 error = EINVAL;
  316                 goto done2;
  317         }
  318 #ifdef MAC
  319         shmsegptr = &shmsegs[IPCID_TO_IX(shmmap_s->shmid)];
  320         error = mac_sysvshm_check_shmdt(td->td_ucred, shmsegptr);
  321         if (error != 0)
  322                 goto done2;
  323 #endif
  324         error = shm_delete_mapping(p->p_vmspace, shmmap_s);
  325 done2:
  326         mtx_unlock(&Giant);
  327         return (error);
  328 }
  329 
  330 #ifndef _SYS_SYSPROTO_H_
  331 struct shmat_args {
  332         int shmid;
  333         const void *shmaddr;
  334         int shmflg;
  335 };
  336 #endif
  337 int
  338 kern_shmat(td, shmid, shmaddr, shmflg)
  339         struct thread *td;
  340         int shmid;
  341         const void *shmaddr;
  342         int shmflg;
  343 {
  344         struct proc *p = td->td_proc;
  345         int i, flags;
  346         struct shmid_kernel *shmseg;
  347         struct shmmap_state *shmmap_s = NULL;
  348         vm_offset_t attach_va;
  349         vm_prot_t prot;
  350         vm_size_t size;
  351         int rv;
  352         int error = 0;
  353 
  354         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
  355                 return (ENOSYS);
  356         mtx_lock(&Giant);
  357         shmmap_s = p->p_vmspace->vm_shm;
  358         if (shmmap_s == NULL) {
  359                 shmmap_s = malloc(shminfo.shmseg * sizeof(struct shmmap_state),
  360                     M_SHM, M_WAITOK);
  361                 for (i = 0; i < shminfo.shmseg; i++)
  362                         shmmap_s[i].shmid = -1;
  363                 p->p_vmspace->vm_shm = shmmap_s;
  364         }
  365         shmseg = shm_find_segment_by_shmid(shmid);
  366         if (shmseg == NULL) {
  367                 error = EINVAL;
  368                 goto done2;
  369         }
  370         error = ipcperm(td, &shmseg->u.shm_perm,
  371             (shmflg & SHM_RDONLY) ? IPC_R : IPC_R|IPC_W);
  372         if (error)
  373                 goto done2;
  374 #ifdef MAC
  375         error = mac_sysvshm_check_shmat(td->td_ucred, shmseg, shmflg);
  376         if (error != 0)
  377                 goto done2;
  378 #endif
  379         for (i = 0; i < shminfo.shmseg; i++) {
  380                 if (shmmap_s->shmid == -1)
  381                         break;
  382                 shmmap_s++;
  383         }
  384         if (i >= shminfo.shmseg) {
  385                 error = EMFILE;
  386                 goto done2;
  387         }
  388         size = round_page(shmseg->u.shm_segsz);
  389         prot = VM_PROT_READ;
  390         if ((shmflg & SHM_RDONLY) == 0)
  391                 prot |= VM_PROT_WRITE;
  392         flags = MAP_ANON | MAP_SHARED;
  393         if (shmaddr) {
  394                 flags |= MAP_FIXED;
  395                 if (shmflg & SHM_RND) {
  396                         attach_va = (vm_offset_t)shmaddr & ~(SHMLBA-1);
  397                 } else if (((vm_offset_t)shmaddr & (SHMLBA-1)) == 0) {
  398                         attach_va = (vm_offset_t)shmaddr;
  399                 } else {
  400                         error = EINVAL;
  401                         goto done2;
  402                 }
  403         } else {
  404                 /*
  405                  * This is just a hint to vm_map_find() about where to
  406                  * put it.
  407                  */
  408                 PROC_LOCK(p);
  409                 attach_va = round_page((vm_offset_t)p->p_vmspace->vm_daddr +
  410                     lim_max(p, RLIMIT_DATA));
  411                 PROC_UNLOCK(p);
  412         }
  413 
  414         vm_object_reference(shmseg->object);
  415         rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
  416             0, &attach_va, size, 0, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
  417             VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE);
  418         if (rv != KERN_SUCCESS) {
  419                 vm_object_deallocate(shmseg->object);
  420                 error = ENOMEM;
  421                 goto done2;
  422         }
  423 
  424         shmmap_s->va = attach_va;
  425         shmmap_s->shmid = shmid;
  426         shmseg->u.shm_lpid = p->p_pid;
  427         shmseg->u.shm_atime = time_second;
  428         shmseg->u.shm_nattch++;
  429         td->td_retval[0] = attach_va;
  430 done2:
  431         mtx_unlock(&Giant);
  432         return (error);
  433 }
  434 
  435 int
  436 sys_shmat(td, uap)
  437         struct thread *td;
  438         struct shmat_args *uap;
  439 {
  440         return kern_shmat(td, uap->shmid, uap->shmaddr, uap->shmflg);
  441 }
  442 
  443 int
  444 kern_shmctl(td, shmid, cmd, buf, bufsz)
  445         struct thread *td;
  446         int shmid;
  447         int cmd;
  448         void *buf;
  449         size_t *bufsz;
  450 {
  451         int error = 0;
  452         struct shmid_kernel *shmseg;
  453 
  454         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
  455                 return (ENOSYS);
  456 
  457         mtx_lock(&Giant);
  458         switch (cmd) {
  459         /*
  460          * It is possible that kern_shmctl is being called from the Linux ABI
  461          * layer, in which case, we will need to implement IPC_INFO.  It should
  462          * be noted that other shmctl calls will be funneled through here for
  463          * Linix binaries as well.
  464          *
  465          * NB: The Linux ABI layer will convert this data to structure(s) more
  466          * consistent with the Linux ABI.
  467          */
  468         case IPC_INFO:
  469                 memcpy(buf, &shminfo, sizeof(shminfo));
  470                 if (bufsz)
  471                         *bufsz = sizeof(shminfo);
  472                 td->td_retval[0] = shmalloced;
  473                 goto done2;
  474         case SHM_INFO: {
  475                 struct shm_info shm_info;
  476                 shm_info.used_ids = shm_nused;
  477                 shm_info.shm_rss = 0;   /*XXX where to get from ? */
  478                 shm_info.shm_tot = 0;   /*XXX where to get from ? */
  479                 shm_info.shm_swp = 0;   /*XXX where to get from ? */
  480                 shm_info.swap_attempts = 0;     /*XXX where to get from ? */
  481                 shm_info.swap_successes = 0;    /*XXX where to get from ? */
  482                 memcpy(buf, &shm_info, sizeof(shm_info));
  483                 if (bufsz)
  484                         *bufsz = sizeof(shm_info);
  485                 td->td_retval[0] = shmalloced;
  486                 goto done2;
  487         }
  488         }
  489         if (cmd == SHM_STAT)
  490                 shmseg = shm_find_segment_by_shmidx(shmid);
  491         else
  492                 shmseg = shm_find_segment_by_shmid(shmid);
  493         if (shmseg == NULL) {
  494                 error = EINVAL;
  495                 goto done2;
  496         }
  497 #ifdef MAC
  498         error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, cmd);
  499         if (error != 0)
  500                 goto done2;
  501 #endif
  502         switch (cmd) {
  503         case SHM_STAT:
  504         case IPC_STAT:
  505                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
  506                 if (error)
  507                         goto done2;
  508                 memcpy(buf, &shmseg->u, sizeof(struct shmid_ds));
  509                 if (bufsz)
  510                         *bufsz = sizeof(struct shmid_ds);
  511                 if (cmd == SHM_STAT)
  512                         td->td_retval[0] = IXSEQ_TO_IPCID(shmid, shmseg->u.shm_perm);
  513                 break;
  514         case IPC_SET: {
  515                 struct shmid_ds *shmid;
  516 
  517                 shmid = (struct shmid_ds *)buf;
  518                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
  519                 if (error)
  520                         goto done2;
  521                 shmseg->u.shm_perm.uid = shmid->shm_perm.uid;
  522                 shmseg->u.shm_perm.gid = shmid->shm_perm.gid;
  523                 shmseg->u.shm_perm.mode =
  524                     (shmseg->u.shm_perm.mode & ~ACCESSPERMS) |
  525                     (shmid->shm_perm.mode & ACCESSPERMS);
  526                 shmseg->u.shm_ctime = time_second;
  527                 break;
  528         }
  529         case IPC_RMID:
  530                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_M);
  531                 if (error)
  532                         goto done2;
  533                 shmseg->u.shm_perm.key = IPC_PRIVATE;
  534                 shmseg->u.shm_perm.mode |= SHMSEG_REMOVED;
  535                 if (shmseg->u.shm_nattch <= 0) {
  536                         shm_deallocate_segment(shmseg);
  537                         shm_last_free = IPCID_TO_IX(shmid);
  538                 }
  539                 break;
  540 #if 0
  541         case SHM_LOCK:
  542         case SHM_UNLOCK:
  543 #endif
  544         default:
  545                 error = EINVAL;
  546                 break;
  547         }
  548 done2:
  549         mtx_unlock(&Giant);
  550         return (error);
  551 }
  552 
  553 #ifndef _SYS_SYSPROTO_H_
  554 struct shmctl_args {
  555         int shmid;
  556         int cmd;
  557         struct shmid_ds *buf;
  558 };
  559 #endif
  560 int
  561 sys_shmctl(td, uap)
  562         struct thread *td;
  563         struct shmctl_args *uap;
  564 {
  565         int error = 0;
  566         struct shmid_ds buf;
  567         size_t bufsz;
  568         
  569         /*
  570          * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
  571          * Linux binaries.  If we see the call come through the FreeBSD ABI,
  572          * return an error back to the user since we do not to support this.
  573          */
  574         if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
  575             uap->cmd == SHM_STAT)
  576                 return (EINVAL);
  577 
  578         /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
  579         if (uap->cmd == IPC_SET) {
  580                 if ((error = copyin(uap->buf, &buf, sizeof(struct shmid_ds))))
  581                         goto done;
  582         }
  583         
  584         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
  585         if (error)
  586                 goto done;
  587         
  588         /* Cases in which we need to copyout */
  589         switch (uap->cmd) {
  590         case IPC_STAT:
  591                 error = copyout(&buf, uap->buf, bufsz);
  592                 break;
  593         }
  594 
  595 done:
  596         if (error) {
  597                 /* Invalidate the return value */
  598                 td->td_retval[0] = -1;
  599         }
  600         return (error);
  601 }
  602 
  603 
  604 static int
  605 shmget_existing(td, uap, mode, segnum)
  606         struct thread *td;
  607         struct shmget_args *uap;
  608         int mode;
  609         int segnum;
  610 {
  611         struct shmid_kernel *shmseg;
  612         int error;
  613 
  614         shmseg = &shmsegs[segnum];
  615         if (shmseg->u.shm_perm.mode & SHMSEG_REMOVED) {
  616                 /*
  617                  * This segment is in the process of being allocated.  Wait
  618                  * until it's done, and look the key up again (in case the
  619                  * allocation failed or it was freed).
  620                  */
  621                 shmseg->u.shm_perm.mode |= SHMSEG_WANTED;
  622                 error = tsleep(shmseg, PLOCK | PCATCH, "shmget", 0);
  623                 if (error)
  624                         return (error);
  625                 return (EAGAIN);
  626         }
  627         if ((uap->shmflg & (IPC_CREAT | IPC_EXCL)) == (IPC_CREAT | IPC_EXCL))
  628                 return (EEXIST);
  629 #ifdef MAC
  630         error = mac_sysvshm_check_shmget(td->td_ucred, shmseg, uap->shmflg);
  631         if (error != 0)
  632                 return (error);
  633 #endif
  634         if (uap->size != 0 && uap->size > shmseg->u.shm_segsz)
  635                 return (EINVAL);
  636         td->td_retval[0] = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
  637         return (0);
  638 }
  639 
  640 static int
  641 shmget_allocate_segment(td, uap, mode)
  642         struct thread *td;
  643         struct shmget_args *uap;
  644         int mode;
  645 {
  646         int i, segnum, shmid;
  647         size_t size;
  648         struct ucred *cred = td->td_ucred;
  649         struct shmid_kernel *shmseg;
  650         vm_object_t shm_object;
  651 
  652         GIANT_REQUIRED;
  653 
  654         if (uap->size < shminfo.shmmin || uap->size > shminfo.shmmax)
  655                 return (EINVAL);
  656         if (shm_nused >= shminfo.shmmni) /* Any shmids left? */
  657                 return (ENOSPC);
  658         size = round_page(uap->size);
  659         if (shm_committed + btoc(size) > shminfo.shmall)
  660                 return (ENOMEM);
  661         if (shm_last_free < 0) {
  662                 shmrealloc();   /* Maybe expand the shmsegs[] array. */
  663                 for (i = 0; i < shmalloced; i++)
  664                         if (shmsegs[i].u.shm_perm.mode & SHMSEG_FREE)
  665                                 break;
  666                 if (i == shmalloced)
  667                         return (ENOSPC);
  668                 segnum = i;
  669         } else  {
  670                 segnum = shm_last_free;
  671                 shm_last_free = -1;
  672         }
  673         shmseg = &shmsegs[segnum];
  674 #ifdef RACCT
  675         PROC_LOCK(td->td_proc);
  676         if (racct_add(td->td_proc, RACCT_NSHM, 1)) {
  677                 PROC_UNLOCK(td->td_proc);
  678                 return (ENOSPC);
  679         }
  680         if (racct_add(td->td_proc, RACCT_SHMSIZE, size)) {
  681                 racct_sub(td->td_proc, RACCT_NSHM, 1);
  682                 PROC_UNLOCK(td->td_proc);
  683                 return (ENOMEM);
  684         }
  685         PROC_UNLOCK(td->td_proc);
  686 #endif
  687         /*
  688          * In case we sleep in malloc(), mark the segment present but deleted
  689          * so that noone else tries to create the same key.
  690          */
  691         shmseg->u.shm_perm.mode = SHMSEG_ALLOCATED | SHMSEG_REMOVED;
  692         shmseg->u.shm_perm.key = uap->key;
  693         shmseg->u.shm_perm.seq = (shmseg->u.shm_perm.seq + 1) & 0x7fff;
  694         shmid = IXSEQ_TO_IPCID(segnum, shmseg->u.shm_perm);
  695         
  696         /*
  697          * We make sure that we have allocated a pager before we need
  698          * to.
  699          */
  700         shm_object = vm_pager_allocate(shm_use_phys ? OBJT_PHYS : OBJT_SWAP,
  701             0, size, VM_PROT_DEFAULT, 0, cred);
  702         if (shm_object == NULL) {
  703 #ifdef RACCT
  704                 PROC_LOCK(td->td_proc);
  705                 racct_sub(td->td_proc, RACCT_NSHM, 1);
  706                 racct_sub(td->td_proc, RACCT_SHMSIZE, size);
  707                 PROC_UNLOCK(td->td_proc);
  708 #endif
  709                 return (ENOMEM);
  710         }
  711         VM_OBJECT_WLOCK(shm_object);
  712         vm_object_clear_flag(shm_object, OBJ_ONEMAPPING);
  713         vm_object_set_flag(shm_object, OBJ_NOSPLIT);
  714         VM_OBJECT_WUNLOCK(shm_object);
  715 
  716         shmseg->object = shm_object;
  717         shmseg->u.shm_perm.cuid = shmseg->u.shm_perm.uid = cred->cr_uid;
  718         shmseg->u.shm_perm.cgid = shmseg->u.shm_perm.gid = cred->cr_gid;
  719         shmseg->u.shm_perm.mode = (shmseg->u.shm_perm.mode & SHMSEG_WANTED) |
  720             (mode & ACCESSPERMS) | SHMSEG_ALLOCATED;
  721         shmseg->cred = crhold(cred);
  722         shmseg->u.shm_segsz = uap->size;
  723         shmseg->u.shm_cpid = td->td_proc->p_pid;
  724         shmseg->u.shm_lpid = shmseg->u.shm_nattch = 0;
  725         shmseg->u.shm_atime = shmseg->u.shm_dtime = 0;
  726 #ifdef MAC
  727         mac_sysvshm_create(cred, shmseg);
  728 #endif
  729         shmseg->u.shm_ctime = time_second;
  730         shm_committed += btoc(size);
  731         shm_nused++;
  732         if (shmseg->u.shm_perm.mode & SHMSEG_WANTED) {
  733                 /*
  734                  * Somebody else wanted this key while we were asleep.  Wake
  735                  * them up now.
  736                  */
  737                 shmseg->u.shm_perm.mode &= ~SHMSEG_WANTED;
  738                 wakeup(shmseg);
  739         }
  740         td->td_retval[0] = shmid;
  741         return (0);
  742 }
  743 
  744 #ifndef _SYS_SYSPROTO_H_
  745 struct shmget_args {
  746         key_t key;
  747         size_t size;
  748         int shmflg;
  749 };
  750 #endif
  751 int
  752 sys_shmget(td, uap)
  753         struct thread *td;
  754         struct shmget_args *uap;
  755 {
  756         int segnum, mode;
  757         int error;
  758 
  759         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
  760                 return (ENOSYS);
  761         mtx_lock(&Giant);
  762         mode = uap->shmflg & ACCESSPERMS;
  763         if (uap->key != IPC_PRIVATE) {
  764         again:
  765                 segnum = shm_find_segment_by_key(uap->key);
  766                 if (segnum >= 0) {
  767                         error = shmget_existing(td, uap, mode, segnum);
  768                         if (error == EAGAIN)
  769                                 goto again;
  770                         goto done2;
  771                 }
  772                 if ((uap->shmflg & IPC_CREAT) == 0) {
  773                         error = ENOENT;
  774                         goto done2;
  775                 }
  776         }
  777         error = shmget_allocate_segment(td, uap, mode);
  778 done2:
  779         mtx_unlock(&Giant);
  780         return (error);
  781 }
  782 
  783 static void
  784 shmfork_myhook(p1, p2)
  785         struct proc *p1, *p2;
  786 {
  787         struct shmmap_state *shmmap_s;
  788         size_t size;
  789         int i;
  790 
  791         mtx_lock(&Giant);
  792         size = shminfo.shmseg * sizeof(struct shmmap_state);
  793         shmmap_s = malloc(size, M_SHM, M_WAITOK);
  794         bcopy(p1->p_vmspace->vm_shm, shmmap_s, size);
  795         p2->p_vmspace->vm_shm = shmmap_s;
  796         for (i = 0; i < shminfo.shmseg; i++, shmmap_s++)
  797                 if (shmmap_s->shmid != -1)
  798                         shmsegs[IPCID_TO_IX(shmmap_s->shmid)].u.shm_nattch++;
  799         mtx_unlock(&Giant);
  800 }
  801 
  802 static void
  803 shmexit_myhook(struct vmspace *vm)
  804 {
  805         struct shmmap_state *base, *shm;
  806         int i;
  807 
  808         if ((base = vm->vm_shm) != NULL) {
  809                 vm->vm_shm = NULL;
  810                 mtx_lock(&Giant);
  811                 for (i = 0, shm = base; i < shminfo.shmseg; i++, shm++) {
  812                         if (shm->shmid != -1)
  813                                 shm_delete_mapping(vm, shm);
  814                 }
  815                 mtx_unlock(&Giant);
  816                 free(base, M_SHM);
  817         }
  818 }
  819 
  820 static void
  821 shmrealloc(void)
  822 {
  823         int i;
  824         struct shmid_kernel *newsegs;
  825 
  826         if (shmalloced >= shminfo.shmmni)
  827                 return;
  828 
  829         newsegs = malloc(shminfo.shmmni * sizeof(*newsegs), M_SHM, M_WAITOK);
  830         if (newsegs == NULL)
  831                 return;
  832         for (i = 0; i < shmalloced; i++)
  833                 bcopy(&shmsegs[i], &newsegs[i], sizeof(newsegs[0]));
  834         for (; i < shminfo.shmmni; i++) {
  835                 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
  836                 shmsegs[i].u.shm_perm.seq = 0;
  837 #ifdef MAC
  838                 mac_sysvshm_init(&shmsegs[i]);
  839 #endif
  840         }
  841         free(shmsegs, M_SHM);
  842         shmsegs = newsegs;
  843         shmalloced = shminfo.shmmni;
  844 }
  845 
  846 static struct syscall_helper_data shm_syscalls[] = {
  847         SYSCALL_INIT_HELPER(shmat),
  848         SYSCALL_INIT_HELPER(shmctl),
  849         SYSCALL_INIT_HELPER(shmdt),
  850         SYSCALL_INIT_HELPER(shmget),
  851 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
  852     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
  853         SYSCALL_INIT_HELPER_COMPAT(freebsd7_shmctl),
  854 #endif
  855 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
  856         SYSCALL_INIT_HELPER(shmsys),
  857 #endif
  858         SYSCALL_INIT_LAST
  859 };
  860 
  861 #ifdef COMPAT_FREEBSD32
  862 #include <compat/freebsd32/freebsd32.h>
  863 #include <compat/freebsd32/freebsd32_ipc.h>
  864 #include <compat/freebsd32/freebsd32_proto.h>
  865 #include <compat/freebsd32/freebsd32_signal.h>
  866 #include <compat/freebsd32/freebsd32_syscall.h>
  867 #include <compat/freebsd32/freebsd32_util.h>
  868 
  869 static struct syscall_helper_data shm32_syscalls[] = {
  870         SYSCALL32_INIT_HELPER_COMPAT(shmat),
  871         SYSCALL32_INIT_HELPER_COMPAT(shmdt),
  872         SYSCALL32_INIT_HELPER_COMPAT(shmget),
  873         SYSCALL32_INIT_HELPER(freebsd32_shmsys),
  874         SYSCALL32_INIT_HELPER(freebsd32_shmctl),
  875 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
  876     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
  877         SYSCALL32_INIT_HELPER(freebsd7_freebsd32_shmctl),
  878 #endif
  879         SYSCALL_INIT_LAST
  880 };
  881 #endif
  882 
  883 static int
  884 shminit()
  885 {
  886         int i, error;
  887 
  888 #ifndef BURN_BRIDGES
  889         if (TUNABLE_ULONG_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall) != 0)
  890                 printf("kern.ipc.shmmaxpgs is now called kern.ipc.shmall!\n");
  891 #endif
  892         TUNABLE_ULONG_FETCH("kern.ipc.shmall", &shminfo.shmall);
  893         if (!TUNABLE_ULONG_FETCH("kern.ipc.shmmax", &shminfo.shmmax)) {
  894                 /* Initialize shmmax dealing with possible overflow. */
  895                 for (i = PAGE_SIZE; i > 0; i--) {
  896                         shminfo.shmmax = shminfo.shmall * i;
  897                         if (shminfo.shmmax >= shminfo.shmall)
  898                                 break;
  899                 }
  900         }
  901         TUNABLE_ULONG_FETCH("kern.ipc.shmmin", &shminfo.shmmin);
  902         TUNABLE_ULONG_FETCH("kern.ipc.shmmni", &shminfo.shmmni);
  903         TUNABLE_ULONG_FETCH("kern.ipc.shmseg", &shminfo.shmseg);
  904         TUNABLE_INT_FETCH("kern.ipc.shm_use_phys", &shm_use_phys);
  905 
  906         shmalloced = shminfo.shmmni;
  907         shmsegs = malloc(shmalloced * sizeof(shmsegs[0]), M_SHM, M_WAITOK);
  908         for (i = 0; i < shmalloced; i++) {
  909                 shmsegs[i].u.shm_perm.mode = SHMSEG_FREE;
  910                 shmsegs[i].u.shm_perm.seq = 0;
  911 #ifdef MAC
  912                 mac_sysvshm_init(&shmsegs[i]);
  913 #endif
  914         }
  915         shm_last_free = 0;
  916         shm_nused = 0;
  917         shm_committed = 0;
  918         shmexit_hook = &shmexit_myhook;
  919         shmfork_hook = &shmfork_myhook;
  920 
  921         error = syscall_helper_register(shm_syscalls);
  922         if (error != 0)
  923                 return (error);
  924 #ifdef COMPAT_FREEBSD32
  925         error = syscall32_helper_register(shm32_syscalls);
  926         if (error != 0)
  927                 return (error);
  928 #endif
  929         return (0);
  930 }
  931 
  932 static int
  933 shmunload()
  934 {
  935         int i;  
  936 
  937         if (shm_nused > 0)
  938                 return (EBUSY);
  939 
  940 #ifdef COMPAT_FREEBSD32
  941         syscall32_helper_unregister(shm32_syscalls);
  942 #endif
  943         syscall_helper_unregister(shm_syscalls);
  944 
  945         for (i = 0; i < shmalloced; i++) {
  946 #ifdef MAC
  947                 mac_sysvshm_destroy(&shmsegs[i]);
  948 #endif
  949                 /*
  950                  * Objects might be still mapped into the processes
  951                  * address spaces.  Actual free would happen on the
  952                  * last mapping destruction.
  953                  */
  954                 if (shmsegs[i].u.shm_perm.mode != SHMSEG_FREE)
  955                         vm_object_deallocate(shmsegs[i].object);
  956         }
  957         free(shmsegs, M_SHM);
  958         shmexit_hook = NULL;
  959         shmfork_hook = NULL;
  960         return (0);
  961 }
  962 
  963 static int
  964 sysctl_shmsegs(SYSCTL_HANDLER_ARGS)
  965 {
  966 
  967         return (SYSCTL_OUT(req, shmsegs, shmalloced * sizeof(shmsegs[0])));
  968 }
  969 
  970 #if defined(__i386__) && (defined(COMPAT_FREEBSD4) || defined(COMPAT_43))
  971 struct oshmid_ds {
  972         struct  ipc_perm_old shm_perm;  /* operation perms */
  973         int     shm_segsz;              /* size of segment (bytes) */
  974         u_short shm_cpid;               /* pid, creator */
  975         u_short shm_lpid;               /* pid, last operation */
  976         short   shm_nattch;             /* no. of current attaches */
  977         time_t  shm_atime;              /* last attach time */
  978         time_t  shm_dtime;              /* last detach time */
  979         time_t  shm_ctime;              /* last change time */
  980         void    *shm_handle;            /* internal handle for shm segment */
  981 };
  982 
  983 struct oshmctl_args {
  984         int shmid;
  985         int cmd;
  986         struct oshmid_ds *ubuf;
  987 };
  988 
  989 static int
  990 oshmctl(struct thread *td, struct oshmctl_args *uap)
  991 {
  992 #ifdef COMPAT_43
  993         int error = 0;
  994         struct shmid_kernel *shmseg;
  995         struct oshmid_ds outbuf;
  996 
  997         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
  998                 return (ENOSYS);
  999         mtx_lock(&Giant);
 1000         shmseg = shm_find_segment_by_shmid(uap->shmid);
 1001         if (shmseg == NULL) {
 1002                 error = EINVAL;
 1003                 goto done2;
 1004         }
 1005         switch (uap->cmd) {
 1006         case IPC_STAT:
 1007                 error = ipcperm(td, &shmseg->u.shm_perm, IPC_R);
 1008                 if (error)
 1009                         goto done2;
 1010 #ifdef MAC
 1011                 error = mac_sysvshm_check_shmctl(td->td_ucred, shmseg, uap->cmd);
 1012                 if (error != 0)
 1013                         goto done2;
 1014 #endif
 1015                 ipcperm_new2old(&shmseg->u.shm_perm, &outbuf.shm_perm);
 1016                 outbuf.shm_segsz = shmseg->u.shm_segsz;
 1017                 outbuf.shm_cpid = shmseg->u.shm_cpid;
 1018                 outbuf.shm_lpid = shmseg->u.shm_lpid;
 1019                 outbuf.shm_nattch = shmseg->u.shm_nattch;
 1020                 outbuf.shm_atime = shmseg->u.shm_atime;
 1021                 outbuf.shm_dtime = shmseg->u.shm_dtime;
 1022                 outbuf.shm_ctime = shmseg->u.shm_ctime;
 1023                 outbuf.shm_handle = shmseg->object;
 1024                 error = copyout(&outbuf, uap->ubuf, sizeof(outbuf));
 1025                 if (error)
 1026                         goto done2;
 1027                 break;
 1028         default:
 1029                 error = freebsd7_shmctl(td, (struct freebsd7_shmctl_args *)uap);
 1030                 break;
 1031         }
 1032 done2:
 1033         mtx_unlock(&Giant);
 1034         return (error);
 1035 #else
 1036         return (EINVAL);
 1037 #endif
 1038 }
 1039 
 1040 /* XXX casting to (sy_call_t *) is bogus, as usual. */
 1041 static sy_call_t *shmcalls[] = {
 1042         (sy_call_t *)sys_shmat, (sy_call_t *)oshmctl,
 1043         (sy_call_t *)sys_shmdt, (sy_call_t *)sys_shmget,
 1044         (sy_call_t *)freebsd7_shmctl
 1045 };
 1046 
 1047 int
 1048 sys_shmsys(td, uap)
 1049         struct thread *td;
 1050         /* XXX actually varargs. */
 1051         struct shmsys_args /* {
 1052                 int     which;
 1053                 int     a2;
 1054                 int     a3;
 1055                 int     a4;
 1056         } */ *uap;
 1057 {
 1058         int error;
 1059 
 1060         if (!prison_allow(td->td_ucred, PR_ALLOW_SYSVIPC))
 1061                 return (ENOSYS);
 1062         if (uap->which < 0 ||
 1063             uap->which >= sizeof(shmcalls)/sizeof(shmcalls[0]))
 1064                 return (EINVAL);
 1065         mtx_lock(&Giant);
 1066         error = (*shmcalls[uap->which])(td, &uap->a2);
 1067         mtx_unlock(&Giant);
 1068         return (error);
 1069 }
 1070 
 1071 #endif  /* i386 && (COMPAT_FREEBSD4 || COMPAT_43) */
 1072 
 1073 #ifdef COMPAT_FREEBSD32
 1074 
 1075 int
 1076 freebsd32_shmsys(struct thread *td, struct freebsd32_shmsys_args *uap)
 1077 {
 1078 
 1079 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
 1080     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
 1081         switch (uap->which) {
 1082         case 0: {       /* shmat */
 1083                 struct shmat_args ap;
 1084 
 1085                 ap.shmid = uap->a2;
 1086                 ap.shmaddr = PTRIN(uap->a3);
 1087                 ap.shmflg = uap->a4;
 1088                 return (sysent[SYS_shmat].sy_call(td, &ap));
 1089         }
 1090         case 2: {       /* shmdt */
 1091                 struct shmdt_args ap;
 1092 
 1093                 ap.shmaddr = PTRIN(uap->a2);
 1094                 return (sysent[SYS_shmdt].sy_call(td, &ap));
 1095         }
 1096         case 3: {       /* shmget */
 1097                 struct shmget_args ap;
 1098 
 1099                 ap.key = uap->a2;
 1100                 ap.size = uap->a3;
 1101                 ap.shmflg = uap->a4;
 1102                 return (sysent[SYS_shmget].sy_call(td, &ap));
 1103         }
 1104         case 4: {       /* shmctl */
 1105                 struct freebsd7_freebsd32_shmctl_args ap;
 1106 
 1107                 ap.shmid = uap->a2;
 1108                 ap.cmd = uap->a3;
 1109                 ap.buf = PTRIN(uap->a4);
 1110                 return (freebsd7_freebsd32_shmctl(td, &ap));
 1111         }
 1112         case 1:         /* oshmctl */
 1113         default:
 1114                 return (EINVAL);
 1115         }
 1116 #else
 1117         return (nosys(td, NULL));
 1118 #endif
 1119 }
 1120 
 1121 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
 1122     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
 1123 int
 1124 freebsd7_freebsd32_shmctl(struct thread *td,
 1125     struct freebsd7_freebsd32_shmctl_args *uap)
 1126 {
 1127         int error = 0;
 1128         union {
 1129                 struct shmid_ds shmid_ds;
 1130                 struct shm_info shm_info;
 1131                 struct shminfo shminfo;
 1132         } u;
 1133         union {
 1134                 struct shmid_ds32_old shmid_ds32;
 1135                 struct shm_info32 shm_info32;
 1136                 struct shminfo32 shminfo32;
 1137         } u32;
 1138         size_t sz;
 1139 
 1140         if (uap->cmd == IPC_SET) {
 1141                 if ((error = copyin(uap->buf, &u32.shmid_ds32,
 1142                     sizeof(u32.shmid_ds32))))
 1143                         goto done;
 1144                 freebsd32_ipcperm_old_in(&u32.shmid_ds32.shm_perm,
 1145                     &u.shmid_ds.shm_perm);
 1146                 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
 1147                 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
 1148                 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
 1149                 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
 1150                 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
 1151                 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
 1152                 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
 1153         }
 1154         
 1155         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
 1156         if (error)
 1157                 goto done;
 1158         
 1159         /* Cases in which we need to copyout */
 1160         switch (uap->cmd) {
 1161         case IPC_INFO:
 1162                 CP(u.shminfo, u32.shminfo32, shmmax);
 1163                 CP(u.shminfo, u32.shminfo32, shmmin);
 1164                 CP(u.shminfo, u32.shminfo32, shmmni);
 1165                 CP(u.shminfo, u32.shminfo32, shmseg);
 1166                 CP(u.shminfo, u32.shminfo32, shmall);
 1167                 error = copyout(&u32.shminfo32, uap->buf,
 1168                     sizeof(u32.shminfo32));
 1169                 break;
 1170         case SHM_INFO:
 1171                 CP(u.shm_info, u32.shm_info32, used_ids);
 1172                 CP(u.shm_info, u32.shm_info32, shm_rss);
 1173                 CP(u.shm_info, u32.shm_info32, shm_tot);
 1174                 CP(u.shm_info, u32.shm_info32, shm_swp);
 1175                 CP(u.shm_info, u32.shm_info32, swap_attempts);
 1176                 CP(u.shm_info, u32.shm_info32, swap_successes);
 1177                 error = copyout(&u32.shm_info32, uap->buf,
 1178                     sizeof(u32.shm_info32));
 1179                 break;
 1180         case SHM_STAT:
 1181         case IPC_STAT:
 1182                 freebsd32_ipcperm_old_out(&u.shmid_ds.shm_perm,
 1183                     &u32.shmid_ds32.shm_perm);
 1184                 if (u.shmid_ds.shm_segsz > INT32_MAX)
 1185                         u32.shmid_ds32.shm_segsz = INT32_MAX;
 1186                 else
 1187                         CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
 1188                 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
 1189                 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
 1190                 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
 1191                 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
 1192                 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
 1193                 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
 1194                 u32.shmid_ds32.shm_internal = 0;
 1195                 error = copyout(&u32.shmid_ds32, uap->buf,
 1196                     sizeof(u32.shmid_ds32));
 1197                 break;
 1198         }
 1199 
 1200 done:
 1201         if (error) {
 1202                 /* Invalidate the return value */
 1203                 td->td_retval[0] = -1;
 1204         }
 1205         return (error);
 1206 }
 1207 #endif
 1208 
 1209 int
 1210 freebsd32_shmctl(struct thread *td, struct freebsd32_shmctl_args *uap)
 1211 {
 1212         int error = 0;
 1213         union {
 1214                 struct shmid_ds shmid_ds;
 1215                 struct shm_info shm_info;
 1216                 struct shminfo shminfo;
 1217         } u;
 1218         union {
 1219                 struct shmid_ds32 shmid_ds32;
 1220                 struct shm_info32 shm_info32;
 1221                 struct shminfo32 shminfo32;
 1222         } u32;
 1223         size_t sz;
 1224         
 1225         if (uap->cmd == IPC_SET) {
 1226                 if ((error = copyin(uap->buf, &u32.shmid_ds32,
 1227                     sizeof(u32.shmid_ds32))))
 1228                         goto done;
 1229                 freebsd32_ipcperm_in(&u32.shmid_ds32.shm_perm,
 1230                     &u.shmid_ds.shm_perm);
 1231                 CP(u32.shmid_ds32, u.shmid_ds, shm_segsz);
 1232                 CP(u32.shmid_ds32, u.shmid_ds, shm_lpid);
 1233                 CP(u32.shmid_ds32, u.shmid_ds, shm_cpid);
 1234                 CP(u32.shmid_ds32, u.shmid_ds, shm_nattch);
 1235                 CP(u32.shmid_ds32, u.shmid_ds, shm_atime);
 1236                 CP(u32.shmid_ds32, u.shmid_ds, shm_dtime);
 1237                 CP(u32.shmid_ds32, u.shmid_ds, shm_ctime);
 1238         }
 1239         
 1240         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&u, &sz);
 1241         if (error)
 1242                 goto done;
 1243         
 1244         /* Cases in which we need to copyout */
 1245         switch (uap->cmd) {
 1246         case IPC_INFO:
 1247                 CP(u.shminfo, u32.shminfo32, shmmax);
 1248                 CP(u.shminfo, u32.shminfo32, shmmin);
 1249                 CP(u.shminfo, u32.shminfo32, shmmni);
 1250                 CP(u.shminfo, u32.shminfo32, shmseg);
 1251                 CP(u.shminfo, u32.shminfo32, shmall);
 1252                 error = copyout(&u32.shminfo32, uap->buf,
 1253                     sizeof(u32.shminfo32));
 1254                 break;
 1255         case SHM_INFO:
 1256                 CP(u.shm_info, u32.shm_info32, used_ids);
 1257                 CP(u.shm_info, u32.shm_info32, shm_rss);
 1258                 CP(u.shm_info, u32.shm_info32, shm_tot);
 1259                 CP(u.shm_info, u32.shm_info32, shm_swp);
 1260                 CP(u.shm_info, u32.shm_info32, swap_attempts);
 1261                 CP(u.shm_info, u32.shm_info32, swap_successes);
 1262                 error = copyout(&u32.shm_info32, uap->buf,
 1263                     sizeof(u32.shm_info32));
 1264                 break;
 1265         case SHM_STAT:
 1266         case IPC_STAT:
 1267                 freebsd32_ipcperm_out(&u.shmid_ds.shm_perm,
 1268                     &u32.shmid_ds32.shm_perm);
 1269                 if (u.shmid_ds.shm_segsz > INT32_MAX)
 1270                         u32.shmid_ds32.shm_segsz = INT32_MAX;
 1271                 else
 1272                         CP(u.shmid_ds, u32.shmid_ds32, shm_segsz);
 1273                 CP(u.shmid_ds, u32.shmid_ds32, shm_lpid);
 1274                 CP(u.shmid_ds, u32.shmid_ds32, shm_cpid);
 1275                 CP(u.shmid_ds, u32.shmid_ds32, shm_nattch);
 1276                 CP(u.shmid_ds, u32.shmid_ds32, shm_atime);
 1277                 CP(u.shmid_ds, u32.shmid_ds32, shm_dtime);
 1278                 CP(u.shmid_ds, u32.shmid_ds32, shm_ctime);
 1279                 error = copyout(&u32.shmid_ds32, uap->buf,
 1280                     sizeof(u32.shmid_ds32));
 1281                 break;
 1282         }
 1283 
 1284 done:
 1285         if (error) {
 1286                 /* Invalidate the return value */
 1287                 td->td_retval[0] = -1;
 1288         }
 1289         return (error);
 1290 }
 1291 #endif
 1292 
 1293 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
 1294     defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
 1295 
 1296 #ifndef CP
 1297 #define CP(src, dst, fld)       do { (dst).fld = (src).fld; } while (0)
 1298 #endif
 1299 
 1300 #ifndef _SYS_SYSPROTO_H_
 1301 struct freebsd7_shmctl_args {
 1302         int shmid;
 1303         int cmd;
 1304         struct shmid_ds_old *buf;
 1305 };
 1306 #endif
 1307 int
 1308 freebsd7_shmctl(td, uap)
 1309         struct thread *td;
 1310         struct freebsd7_shmctl_args *uap;
 1311 {
 1312         int error = 0;
 1313         struct shmid_ds_old old;
 1314         struct shmid_ds buf;
 1315         size_t bufsz;
 1316         
 1317         /*
 1318          * The only reason IPC_INFO, SHM_INFO, SHM_STAT exists is to support
 1319          * Linux binaries.  If we see the call come through the FreeBSD ABI,
 1320          * return an error back to the user since we do not to support this.
 1321          */
 1322         if (uap->cmd == IPC_INFO || uap->cmd == SHM_INFO ||
 1323             uap->cmd == SHM_STAT)
 1324                 return (EINVAL);
 1325 
 1326         /* IPC_SET needs to copyin the buffer before calling kern_shmctl */
 1327         if (uap->cmd == IPC_SET) {
 1328                 if ((error = copyin(uap->buf, &old, sizeof(old))))
 1329                         goto done;
 1330                 ipcperm_old2new(&old.shm_perm, &buf.shm_perm);
 1331                 CP(old, buf, shm_segsz);
 1332                 CP(old, buf, shm_lpid);
 1333                 CP(old, buf, shm_cpid);
 1334                 CP(old, buf, shm_nattch);
 1335                 CP(old, buf, shm_atime);
 1336                 CP(old, buf, shm_dtime);
 1337                 CP(old, buf, shm_ctime);
 1338         }
 1339         
 1340         error = kern_shmctl(td, uap->shmid, uap->cmd, (void *)&buf, &bufsz);
 1341         if (error)
 1342                 goto done;
 1343 
 1344         /* Cases in which we need to copyout */
 1345         switch (uap->cmd) {
 1346         case IPC_STAT:
 1347                 ipcperm_new2old(&buf.shm_perm, &old.shm_perm);
 1348                 if (buf.shm_segsz > INT_MAX)
 1349                         old.shm_segsz = INT_MAX;
 1350                 else
 1351                         CP(buf, old, shm_segsz);
 1352                 CP(buf, old, shm_lpid);
 1353                 CP(buf, old, shm_cpid);
 1354                 if (buf.shm_nattch > SHRT_MAX)
 1355                         old.shm_nattch = SHRT_MAX;
 1356                 else
 1357                         CP(buf, old, shm_nattch);
 1358                 CP(buf, old, shm_atime);
 1359                 CP(buf, old, shm_dtime);
 1360                 CP(buf, old, shm_ctime);
 1361                 old.shm_internal = NULL;
 1362                 error = copyout(&old, uap->buf, sizeof(old));
 1363                 break;
 1364         }
 1365 
 1366 done:
 1367         if (error) {
 1368                 /* Invalidate the return value */
 1369                 td->td_retval[0] = -1;
 1370         }
 1371         return (error);
 1372 }
 1373 
 1374 #endif  /* COMPAT_FREEBSD4 || COMPAT_FREEBSD5 || COMPAT_FREEBSD6 ||
 1375            COMPAT_FREEBSD7 */
 1376 
 1377 static int
 1378 sysvshm_modload(struct module *module, int cmd, void *arg)
 1379 {
 1380         int error = 0;
 1381 
 1382         switch (cmd) {
 1383         case MOD_LOAD:
 1384                 error = shminit();
 1385                 if (error != 0)
 1386                         shmunload();
 1387                 break;
 1388         case MOD_UNLOAD:
 1389                 error = shmunload();
 1390                 break;
 1391         case MOD_SHUTDOWN:
 1392                 break;
 1393         default:
 1394                 error = EINVAL;
 1395                 break;
 1396         }
 1397         return (error);
 1398 }
 1399 
 1400 static moduledata_t sysvshm_mod = {
 1401         "sysvshm",
 1402         &sysvshm_modload,
 1403         NULL
 1404 };
 1405 
 1406 DECLARE_MODULE(sysvshm, sysvshm_mod, SI_SUB_SYSV_SHM, SI_ORDER_FIRST);
 1407 MODULE_VERSION(sysvshm, 1);

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