The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_ipc.c

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    1 /*      $NetBSD: sysv_ipc.c,v 1.21 2008/04/28 20:24:05 martin Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1998, 2007 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Charles M. Hannum.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: sysv_ipc.c,v 1.21 2008/04/28 20:24:05 martin Exp $");
   34 
   35 #include "opt_sysv.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/kernel.h>
   39 #include <sys/proc.h>
   40 #include <sys/ipc.h>
   41 #ifdef SYSVMSG
   42 #include <sys/msg.h>
   43 #endif
   44 #ifdef SYSVSEM
   45 #include <sys/sem.h>
   46 #endif
   47 #ifdef SYSVSHM
   48 #include <sys/shm.h>
   49 #endif
   50 #include <sys/systm.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mount.h>
   53 #include <sys/vnode.h>
   54 #include <sys/stat.h>
   55 #include <sys/sysctl.h>
   56 #include <sys/kauth.h>
   57 
   58 /*
   59  * Check for ipc permission
   60  */
   61 
   62 int
   63 ipcperm(kauth_cred_t cred, struct ipc_perm *perm, int mode)
   64 {
   65         mode_t mask;
   66         int ismember = 0;
   67 
   68         if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) == 0)
   69                 return (0);
   70 
   71         if (mode == IPC_M) {
   72                 if (kauth_cred_geteuid(cred) == perm->uid ||
   73                     kauth_cred_geteuid(cred) == perm->cuid)
   74                         return (0);
   75                 return (EPERM);
   76         }
   77 
   78         mask = 0;
   79 
   80         if (kauth_cred_geteuid(cred) == perm->uid ||
   81             kauth_cred_geteuid(cred) == perm->cuid) {
   82                 if (mode & IPC_R)
   83                         mask |= S_IRUSR;
   84                 if (mode & IPC_W)
   85                         mask |= S_IWUSR;
   86                 return ((perm->mode & mask) == mask ? 0 : EACCES);
   87         }
   88 
   89         if (kauth_cred_getegid(cred) == perm->gid ||
   90             (kauth_cred_ismember_gid(cred, perm->gid, &ismember) == 0 && ismember) ||
   91             kauth_cred_getegid(cred) == perm->cgid ||
   92             (kauth_cred_ismember_gid(cred, perm->cgid, &ismember) == 0 && ismember)) {
   93                 if (mode & IPC_R)
   94                         mask |= S_IRGRP;
   95                 if (mode & IPC_W)
   96                         mask |= S_IWGRP;
   97                 return ((perm->mode & mask) == mask ? 0 : EACCES);
   98         }
   99 
  100         if (mode & IPC_R)
  101                 mask |= S_IROTH;
  102         if (mode & IPC_W)
  103                 mask |= S_IWOTH;
  104         return ((perm->mode & mask) == mask ? 0 : EACCES);
  105 }
  106 
  107 /*
  108  * sysctl helper routine for kern.ipc.sysvipc_info subtree.
  109  */
  110 
  111 #define FILL_PERM(src, dst) do { \
  112         (dst)._key = (src)._key; \
  113         (dst).uid = (src).uid; \
  114         (dst).gid = (src).gid; \
  115         (dst).cuid = (src).cuid; \
  116         (dst).cgid = (src).cgid; \
  117         (dst).mode = (src).mode; \
  118         (dst)._seq = (src)._seq; \
  119 } while (/*CONSTCOND*/ 0);
  120 
  121 #define FILL_MSG(src, dst) do { \
  122         FILL_PERM((src).msg_perm, (dst).msg_perm); \
  123         (dst).msg_qnum = (src).msg_qnum; \
  124         (dst).msg_qbytes = (src).msg_qbytes; \
  125         (dst)._msg_cbytes = (src)._msg_cbytes; \
  126         (dst).msg_lspid = (src).msg_lspid; \
  127         (dst).msg_lrpid = (src).msg_lrpid; \
  128         (dst).msg_stime = (src).msg_stime; \
  129         (dst).msg_rtime = (src).msg_rtime; \
  130         (dst).msg_ctime = (src).msg_ctime; \
  131 } while (/*CONSTCOND*/ 0)
  132 
  133 #define FILL_SEM(src, dst) do { \
  134         FILL_PERM((src).sem_perm, (dst).sem_perm); \
  135         (dst).sem_nsems = (src).sem_nsems; \
  136         (dst).sem_otime = (src).sem_otime; \
  137         (dst).sem_ctime = (src).sem_ctime; \
  138 } while (/*CONSTCOND*/ 0)
  139 
  140 #define FILL_SHM(src, dst) do { \
  141         FILL_PERM((src).shm_perm, (dst).shm_perm); \
  142         (dst).shm_segsz = (src).shm_segsz; \
  143         (dst).shm_lpid = (src).shm_lpid; \
  144         (dst).shm_cpid = (src).shm_cpid; \
  145         (dst).shm_atime = (src).shm_atime; \
  146         (dst).shm_dtime = (src).shm_dtime; \
  147         (dst).shm_ctime = (src).shm_ctime; \
  148         (dst).shm_nattch = (src).shm_nattch; \
  149 } while (/*CONSTCOND*/ 0)
  150 
  151 static int
  152 sysctl_kern_sysvipc(SYSCTLFN_ARGS)
  153 {
  154         void *where = oldp;
  155         size_t *sizep = oldlenp;
  156 #ifdef SYSVMSG
  157         struct msg_sysctl_info *msgsi = NULL;
  158 #endif
  159 #ifdef SYSVSEM
  160         struct sem_sysctl_info *semsi = NULL;
  161 #endif
  162 #ifdef SYSVSHM
  163         struct shm_sysctl_info *shmsi = NULL;
  164 #endif
  165         size_t infosize, dssize, tsize, buflen;
  166         void *bf = NULL;
  167         char *start;
  168         int32_t nds;
  169         int i, error, ret;
  170 
  171         if (namelen != 1)
  172                 return EINVAL;
  173 
  174         start = where;
  175         buflen = *sizep;
  176 
  177         switch (*name) {
  178         case KERN_SYSVIPC_MSG_INFO:
  179 #ifdef SYSVMSG
  180                 infosize = sizeof(msgsi->msginfo);
  181                 nds = msginfo.msgmni;
  182                 dssize = sizeof(msgsi->msgids[0]);
  183                 break;
  184 #else
  185                 return EINVAL;
  186 #endif
  187         case KERN_SYSVIPC_SEM_INFO:
  188 #ifdef SYSVSEM
  189                 infosize = sizeof(semsi->seminfo);
  190                 nds = seminfo.semmni;
  191                 dssize = sizeof(semsi->semids[0]);
  192                 break;
  193 #else
  194                 return EINVAL;
  195 #endif
  196         case KERN_SYSVIPC_SHM_INFO:
  197 #ifdef SYSVSHM
  198                 infosize = sizeof(shmsi->shminfo);
  199                 nds = shminfo.shmmni;
  200                 dssize = sizeof(shmsi->shmids[0]);
  201                 break;
  202 #else
  203                 return EINVAL;
  204 #endif
  205         default:
  206                 return EINVAL;
  207         }
  208         /*
  209          * Round infosize to 64 bit boundary if requesting more than just
  210          * the info structure or getting the total data size.
  211          */
  212         if (where == NULL || *sizep > infosize)
  213                 infosize = roundup(infosize, sizeof(quad_t));
  214         tsize = infosize + nds * dssize;
  215 
  216         /* Return just the total size required. */
  217         if (where == NULL) {
  218                 *sizep = tsize;
  219                 return 0;
  220         }
  221 
  222         /* Not enough room for even the info struct. */
  223         if (buflen < infosize) {
  224                 *sizep = 0;
  225                 return ENOMEM;
  226         }
  227         bf = malloc(min(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO);
  228 
  229         switch (*name) {
  230 #ifdef SYSVMSG
  231         case KERN_SYSVIPC_MSG_INFO:
  232                 msgsi = (struct msg_sysctl_info *)bf;
  233                 msgsi->msginfo = msginfo;
  234                 break;
  235 #endif
  236 #ifdef SYSVSEM
  237         case KERN_SYSVIPC_SEM_INFO:
  238                 semsi = (struct sem_sysctl_info *)bf;
  239                 semsi->seminfo = seminfo;
  240                 break;
  241 #endif
  242 #ifdef SYSVSHM
  243         case KERN_SYSVIPC_SHM_INFO:
  244                 shmsi = (struct shm_sysctl_info *)bf;
  245                 shmsi->shminfo = shminfo;
  246                 break;
  247 #endif
  248         }
  249         buflen -= infosize;
  250 
  251         ret = 0;
  252         if (buflen > 0) {
  253                 /* Fill in the IPC data structures.  */
  254                 for (i = 0; i < nds; i++) {
  255                         if (buflen < dssize) {
  256                                 ret = ENOMEM;
  257                                 break;
  258                         }
  259                         switch (*name) {
  260 #ifdef SYSVMSG
  261                         case KERN_SYSVIPC_MSG_INFO:
  262                                 mutex_enter(&msgmutex);
  263                                 FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]);
  264                                 mutex_exit(&msgmutex);
  265                                 break;
  266 #endif
  267 #ifdef SYSVSEM
  268                         case KERN_SYSVIPC_SEM_INFO:
  269                                 FILL_SEM(sema[i], semsi->semids[i]);
  270                                 break;
  271 #endif
  272 #ifdef SYSVSHM
  273                         case KERN_SYSVIPC_SHM_INFO:
  274                                 FILL_SHM(shmsegs[i], shmsi->shmids[i]);
  275                                 break;
  276 #endif
  277                         }
  278                         buflen -= dssize;
  279                 }
  280         }
  281         *sizep -= buflen;
  282         error = copyout(bf, start, *sizep);
  283         /* If copyout succeeded, use return code set earlier. */
  284         if (error == 0)
  285                 error = ret;
  286         if (bf)
  287                 free(bf, M_TEMP);
  288         return error;
  289 }
  290 
  291 #undef FILL_PERM
  292 #undef FILL_MSG
  293 #undef FILL_SEM
  294 #undef FILL_SHM
  295 
  296 SYSCTL_SETUP(sysctl_ipc_setup, "sysctl kern.ipc subtree setup")
  297 {
  298         sysctl_createv(clog, 0, NULL, NULL,
  299                 CTLFLAG_PERMANENT,
  300                 CTLTYPE_NODE, "kern", NULL,
  301                 NULL, 0, NULL, 0,
  302                 CTL_KERN, CTL_EOL);
  303 
  304         sysctl_createv(clog, 0, NULL, NULL,
  305                 CTLFLAG_PERMANENT,
  306                 CTLTYPE_NODE, "ipc",
  307                 SYSCTL_DESCR("SysV IPC options"),
  308                 NULL, 0, NULL, 0,
  309                 CTL_KERN, KERN_SYSVIPC, CTL_EOL);
  310 
  311         sysctl_createv(clog, 0, NULL, NULL,
  312                 CTLFLAG_PERMANENT,
  313                 CTLTYPE_STRUCT, "sysvipc_info",
  314                 SYSCTL_DESCR("System V style IPC information"),
  315                 sysctl_kern_sysvipc, 0, NULL, 0,
  316                 CTL_KERN, KERN_SYSVIPC, KERN_SYSVIPC_INFO, CTL_EOL);
  317 }

Cache object: dec6519c418c9c5e8df8eda6120b6369


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