/* $OpenBSD: sysv_ipc.c,v 1.5 2005/12/13 10:33:14 jsg Exp $ */ /* $NetBSD: sysv_ipc.c,v 1.10 1995/06/03 05:53:28 mycroft Exp $ */ /* * Copyright (c) 1995 Charles M. Hannum. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Charles M. Hannum. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <sys/param.h> #include <sys/kernel.h> #include <sys/proc.h> #include <sys/ipc.h> #include <sys/systm.h> #include <sys/mount.h> #include <sys/vnode.h> /* * Check for ipc permission */ int ipcperm(struct ucred *cred, struct ipc_perm *perm, int mode) { if (mode == IPC_M) { if (cred->cr_uid == 0 || cred->cr_uid == perm->uid || cred->cr_uid == perm->cuid) return (0); return (EPERM); } if (vaccess(perm->mode, perm->uid, perm->gid, mode, cred) == 0 || vaccess(perm->mode, perm->cuid, perm->cgid, mode, cred) == 0) return (0); return (EACCES); }