1 /* $Id$ */ 2 /* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Herb Peyerl. 19 * 4. The name of Herb Peyerl may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/proc.h> 37 #include <sys/ipc.h> 38 #include <sys/systm.h> 39 40 /* 41 * Check for ipc permission 42 */ 43 44 int 45 ipcperm(cred, perm, mode) 46 struct ucred *cred; 47 struct ipc_perm *perm; 48 int mode; 49 { 50 51 if (cred->cr_uid == 0) 52 return (0); 53 54 /* Check for user match. */ 55 if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) { 56 if (mode & IPC_M) 57 return (EPERM); 58 /* Check for group match. */ 59 mode >>= 3; 60 if (!groupmember(perm->gid, cred) && 61 !groupmember(perm->cgid, cred)) 62 /* Check for `other' match. */ 63 mode >>= 3; 64 } 65 66 if (mode & IPC_M) 67 return (0); 68 return ((mode & perm->mode) == mode ? 0 : EACCES); 69 } 70