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Annotation of sys/kern/sysv_ipc.c, Revision 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: }