Line data    Source code

       1             : /*      $OpenBSD: sysv_ipc.c,v 1.8 2015/03/14 03:38:50 jsg Exp $        */
       2             : /*      $NetBSD: sysv_ipc.c,v 1.10 1995/06/03 05:53:28 mycroft Exp $    */
       3             : 
       4             : /*
       5             :  * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
       6             :  *
       7             :  * Redistribution and use in source and binary forms, with or without
       8             :  * modification, are permitted provided that the following conditions
       9             :  * are met:
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  * 2. Redistributions in binary form must reproduce the above copyright
      13             :  *    notice, this list of conditions and the following disclaimer in the
      14             :  *    documentation and/or other materials provided with the distribution.
      15             :  * 3. All advertising materials mentioning features or use of this software
      16             :  *    must display the following acknowledgement:
      17             :  *      This product includes software developed by Charles M. Hannum.
      18             :  * 4. The name of the author may not be used to endorse or promote products
      19             :  *    derived from this software without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      22             :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      23             :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      24             :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      25             :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      26             :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      27             :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      28             :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      29             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      30             :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      31             :  */
      32             : 
      33             : #include <sys/param.h>
      34             : #include <sys/ipc.h>
      35             : #include <sys/systm.h>
      36             : #include <sys/mount.h>
      37             : #include <sys/vnode.h>
      38             : 
      39             : /*
      40             :  * Check for ipc permission
      41             :  */
      42             : 
      43             : int
      44           0 : ipcperm(struct ucred *cred, struct ipc_perm *perm, int mode)
      45             : {
      46             : 
      47           0 :         if (mode == IPC_M) {
      48           0 :                 if (cred->cr_uid == 0 ||
      49           0 :                     cred->cr_uid == perm->uid ||
      50           0 :                     cred->cr_uid == perm->cuid)
      51           0 :                         return (0);
      52           0 :                 return (EPERM);
      53             :         }
      54             : 
      55           0 :         if (vaccess(VNON, perm->mode, perm->uid, perm->gid, mode, cred) == 0 ||
      56           0 :             vaccess(VNON, perm->mode, perm->cuid, perm->cgid, mode, cred) == 0)
      57           0 :                 return (0);
      58           0 :         return (EACCES);
      59           0 : }