root/kern/sysv_ipc.c

DEFINITIONS

1. ipcperm

    1 /*      $OpenBSD: sysv_ipc.c,v 1.5 2005/12/13 10:33:14 jsg Exp $        */
    2 /*      $NetBSD: sysv_ipc.c,v 1.10 1995/06/03 05:53:28 mycroft Exp $    */
    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  */
   33 #include <sys/param.h>
   34 #include <sys/kernel.h>
   35 #include <sys/proc.h>
   36 #include <sys/ipc.h>
   37 #include <sys/systm.h>
   38 #include <sys/mount.h>
   39 #include <sys/vnode.h>
   41 /*
   42  * Check for ipc permission
   43  */
   45 int
ipcperm(struct ucred *cred, struct ipc_perm *perm, int mode)
   47 {
   49         if (mode == IPC_M) {
   50                 if (cred->cr_uid == 0 ||
cred->cr_uid == perm->uid ||
cred->cr_uid == perm->cuid)
   53                         return (0);
   54                 return (EPERM);
   55         }
   57         if (vaccess(perm->mode, perm->uid, perm->gid, mode, cred) == 0 ||
vaccess(perm->mode, perm->cuid, perm->cgid, mode, cred) == 0)
   59                 return (0);
   60         return (EACCES);
   61 }