FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_ipc.c
1 /* $NetBSD: sysv_ipc.c,v 1.15 2001/11/12 15:25:25 lukem Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: sysv_ipc.c,v 1.15 2001/11/12 15:25:25 lukem Exp $");
41
42 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/proc.h>
45 #include <sys/ipc.h>
46 #include <sys/systm.h>
47 #include <sys/mount.h>
48 #include <sys/vnode.h>
49 #include <sys/stat.h>
50
51 /*
52 * Check for ipc permission
53 */
54
55 int
56 ipcperm(cred, perm, mode)
57 struct ucred *cred;
58 struct ipc_perm *perm;
59 int mode;
60 {
61 mode_t mask;
62
63 if (cred->cr_uid == 0)
64 return (0);
65
66 if (mode == IPC_M) {
67 if (cred->cr_uid == perm->uid ||
68 cred->cr_uid == perm->cuid)
69 return (0);
70 return (EPERM);
71 }
72
73 mask = 0;
74
75 if (cred->cr_uid == perm->uid ||
76 cred->cr_uid == perm->cuid) {
77 if (mode & IPC_R)
78 mask |= S_IRUSR;
79 if (mode & IPC_W)
80 mask |= S_IWUSR;
81 return ((perm->mode & mask) == mask ? 0 : EACCES);
82 }
83
84 if (cred->cr_gid == perm->gid || groupmember(perm->gid, cred) ||
85 cred->cr_gid == perm->cgid || groupmember(perm->cgid, cred)) {
86 if (mode & IPC_R)
87 mask |= S_IRGRP;
88 if (mode & IPC_W)
89 mask |= S_IWGRP;
90 return ((perm->mode & mask) == mask ? 0 : EACCES);
91 }
92
93 if (mode & IPC_R)
94 mask |= S_IROTH;
95 if (mode & IPC_W)
96 mask |= S_IWOTH;
97 return ((perm->mode & mask) == mask ? 0 : EACCES);
98 }
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