70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/* $NetBSD: sysv_ipc.c,v 1.8 1995/06/01 22:44:06 jtc Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
|
|
* 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 Herb Peyerl.
|
|
* 4. The name of Herb Peyerl 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>
|
|
|
|
/*
|
|
* Check for ipc permission
|
|
*/
|
|
|
|
int
|
|
ipcperm(cred, perm, mode)
|
|
struct ucred *cred;
|
|
struct ipc_perm *perm;
|
|
int mode;
|
|
{
|
|
|
|
if (cred->cr_uid == 0)
|
|
return (0);
|
|
|
|
/* Check for user match. */
|
|
if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
|
|
if (mode & IPC_M)
|
|
return (EPERM);
|
|
/* Check for group match. */
|
|
mode >>= 3;
|
|
if (cred->cr_gid != perm->cgid && cred->cr_gid != perm->gid &&
|
|
!groupmember(perm->gid, cred) &&
|
|
!groupmember(perm->cgid, cred))
|
|
/* Check for `other' match. */
|
|
mode >>= 3;
|
|
}
|
|
|
|
if (mode & IPC_M)
|
|
return (0);
|
|
return ((mode & perm->mode) == mode ? 0 : EACCES);
|
|
}
|