1 /* $OpenBSD: sysv_ipc.c,v 1.6 2008/06/09 23:38:37 millert 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(VNON, perm->mode, perm->uid, perm->gid, mode, cred) == 0 || 58 vaccess(VNON, perm->mode, perm->cuid, perm->cgid, mode, cred) == 0) 59 return (0); 60 return (EACCES); 61 } 62