Annotation of sys/kern/sysv_ipc.c, Revision 1.1.1.1
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: }
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