1 /* $NetBSD: sysv_ipc.c,v 1.10 1995/06/03 05:53:28 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Charles M. Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles M. Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/proc.h> 35 #include <sys/ipc.h> 36 #include <sys/systm.h> 37 #include <sys/mount.h> 38 #include <sys/vnode.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 (mode == IPC_M) { 52 if (cred->cr_uid == 0 || 53 cred->cr_uid == perm->uid || 54 cred->cr_uid == perm->cuid) 55 return (0); 56 return (EPERM); 57 } 58 59 if (vaccess(perm->mode, perm->uid, perm->gid, mode, cred) == 0 || 60 vaccess(perm->mode, perm->cuid, perm->cgid, mode, cred) == 0) 61 return (0); 62 return (EACCES); 63 } 64