FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_ipc.c
1 /* $FreeBSD: releng/5.0/sys/kern/sysv_ipc.c 93593 2002-04-01 21:31:13Z jhb $ */
2 /* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */
3
4 /*
5 * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by Herb Peyerl.
19 * 4. The name of Herb Peyerl may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include "opt_sysvipc.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/sem.h>
39 #include <sys/shm.h>
40 #include <sys/ipc.h>
41 #include <sys/proc.h>
42 #include <sys/ucred.h>
43
44 void (*shmfork_hook)(struct proc *, struct proc *) = NULL;
45 void (*shmexit_hook)(struct proc *) = NULL;
46
47 /* called from kern_fork.c */
48 void
49 shmfork(p1, p2)
50 struct proc *p1, *p2;
51 {
52
53 if (shmfork_hook != NULL)
54 shmfork_hook(p1, p2);
55 return;
56 }
57
58 /* called from kern_exit.c */
59 void
60 shmexit(p)
61 struct proc *p;
62 {
63
64 if (shmexit_hook != NULL)
65 shmexit_hook(p);
66 return;
67 }
68
69 /*
70 * Check for ipc permission
71 */
72
73 int
74 ipcperm(td, perm, mode)
75 struct thread *td;
76 struct ipc_perm *perm;
77 int mode;
78 {
79 struct ucred *cred = td->td_ucred;
80
81 /* Check for user match. */
82 if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
83 if (mode & IPC_M)
84 return (suser(td) == 0 ? 0 : EPERM);
85 /* Check for group match. */
86 mode >>= 3;
87 if (!groupmember(perm->gid, cred) &&
88 !groupmember(perm->cgid, cred))
89 /* Check for `other' match. */
90 mode >>= 3;
91 }
92
93 if (mode & IPC_M)
94 return (0);
95 return ((mode & perm->mode) == mode ||
96 suser(td) == 0 ? 0 : EACCES);
97 }
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