sysv_ipc.c

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    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 ipcperm(struct ucred *cred, struct ipc_perm *perm, int mode)
   45 {
   46 
   47         if (mode == IPC_M) {
   48                 if (cred->cr_uid == 0 ||
   49                     cred->cr_uid == perm->uid ||
   50                     cred->cr_uid == perm->cuid)
   51                         return (0);
   52                 return (EPERM);
   53         }
   54 
   55         if (vaccess(VNON, perm->mode, perm->uid, perm->gid, mode, cred) == 0 ||
   56             vaccess(VNON, perm->mode, perm->cuid, perm->cgid, mode, cred) == 0)
   57                 return (0);
   58         return (EACCES);
   59 }

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

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