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Annotation of sys/kern/sysv_ipc.c, Revision 1.1.1.1

1.1       nbrk        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 $    */
                      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/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>
                     40:
                     41: /*
                     42:  * Check for ipc permission
                     43:  */
                     44:
                     45: int
                     46: ipcperm(struct ucred *cred, struct ipc_perm *perm, int mode)
                     47: {
                     48:
                     49:        if (mode == IPC_M) {
                     50:                if (cred->cr_uid == 0 ||
                     51:                    cred->cr_uid == perm->uid ||
                     52:                    cred->cr_uid == perm->cuid)
                     53:                        return (0);
                     54:                return (EPERM);
                     55:        }
                     56:
                     57:        if (vaccess(perm->mode, perm->uid, perm->gid, mode, cred) == 0 ||
                     58:            vaccess(perm->mode, perm->cuid, perm->cgid, mode, cred) == 0)
                     59:                return (0);
                     60:        return (EACCES);
                     61: }