103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department. Originally from University of Wisconsin.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: uipc_shm.c 1.9 89/08/14$
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*
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* from: @(#)sysv_shm.c 7.15 (Berkeley) 5/13/91
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* $Id: sysv_ipc.c,v 1.3 1994/05/12 00:54:58 cgd Exp $
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*/
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/*
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* IPC routines shared by some or all of the SYSV IPC system calls.
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*/
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#ifndef SYSVIPC
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#ifdef SYSVSHM
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#define SYSVIPC
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#endif
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#ifdef SYSVSEM
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#define SYSVIPC
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#endif
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#ifdef SYSVMSG
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#define SYSVIPC
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#endif
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#endif
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#ifdef SYSVIPC
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/ipc.h>
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/*
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* Perform access checking.
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*/
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ipcaccess(ipc, mode, cred)
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register struct ipc_perm *ipc;
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int mode;
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register struct ucred *cred;
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{
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register int m;
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if (cred->cr_uid == 0)
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return(0);
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/*
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* Access check is based on only one of owner, group, public.
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* If not owner, then check group.
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* If not a member of the group, then check public access.
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*/
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mode &= 0700;
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m = ipc->mode;
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if (cred->cr_uid != ipc->uid && cred->cr_uid != ipc->cuid) {
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m <<= 3;
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if (!groupmember(ipc->gid, cred) &&
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!groupmember(ipc->cgid, cred))
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m <<= 3;
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}
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if ((mode&m) == mode)
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return (0);
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return (EACCES);
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}
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#endif /* SYSVSHM */
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