2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
5 * Copyright (c) 2006 nCircle Network Security, Inc.
8 * This software was developed by Robert N. M. Watson for the TrustedBSD
9 * Project under contract to nCircle Network Security, Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Herb Peyerl.
22 * 4. The name of Herb Peyerl may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 * $NetBSD: sysv_ipc.c,v 1.9 1995/06/02 19:04:22 mycroft Exp $
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include "opt_sysvipc.h"
44 #include <sys/param.h>
45 #include <sys/systm.h>
51 #include <sys/ucred.h>
54 void (*shmfork_hook)(struct proc *, struct proc *) = NULL;
55 void (*shmexit_hook)(struct vmspace *) = NULL;
57 /* called from kern_fork.c */
59 shmfork(struct proc *p1, struct proc *p2)
61 if (shmfork_hook != NULL)
65 /* called from kern_exit.c */
67 shmexit(struct vmspace *vm)
69 if (shmexit_hook != NULL)
75 * Check for IPC permission.
77 * Note: The MAC Framework does not require any modifications to the
78 * ipcperm() function, as access control checks are performed throughout the
79 * implementation of each primitive. Those entry point calls complement the
80 * ipcperm() discertionary checks. Unlike file system discretionary access
81 * control, the original create of an object is given the same rights as the
85 ipcperm(struct thread *td, struct ipc_perm *perm, int acc_mode)
87 struct ucred *cred = td->td_ucred;
88 int error, obj_mode, dac_granted, priv_granted;
91 if (cred->cr_uid == perm->cuid || cred->cr_uid == perm->uid) {
92 obj_mode = perm->mode;
94 } else if (groupmember(perm->gid, cred) ||
95 groupmember(perm->cgid, cred)) {
96 obj_mode = perm->mode;
99 obj_mode = perm->mode;
104 * While the System V IPC permission model allows IPC_M to be
105 * granted, as part of the mode, our implementation requires
106 * privilege to adminster the object if not the owner or creator.
109 if (obj_mode & IPC_M)
110 dac_granted |= IPC_M;
112 if (obj_mode & IPC_R)
113 dac_granted |= IPC_R;
114 if (obj_mode & IPC_W)
115 dac_granted |= IPC_W;
118 * Simple case: all required rights are granted by DAC.
120 if ((dac_granted & acc_mode) == acc_mode)
124 * Privilege is required to satisfy the request.
127 if ((acc_mode & IPC_M) && !(dac_granted & IPC_M)) {
128 error = priv_check(td, PRIV_IPC_ADMIN);
130 priv_granted |= IPC_M;
133 if ((acc_mode & IPC_R) && !(dac_granted & IPC_R)) {
134 error = priv_check(td, PRIV_IPC_READ);
136 priv_granted |= IPC_R;
139 if ((acc_mode & IPC_W) && !(dac_granted & IPC_W)) {
140 error = priv_check(td, PRIV_IPC_WRITE);
142 priv_granted |= IPC_W;
145 if (((dac_granted | priv_granted) & acc_mode) == acc_mode)
151 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
152 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
154 ipcperm_old2new(struct ipc_perm_old *old, struct ipc_perm *new)
157 new->cuid = old->cuid;
158 new->cgid = old->cgid;
161 new->mode = old->mode;
167 ipcperm_new2old(struct ipc_perm *new, struct ipc_perm_old *old)
170 /* XXX: How to handle ID's > USHORT_MAX? */
171 old->cuid = new->cuid;
172 old->cgid = new->cgid;
175 old->mode = new->mode;
181 #ifdef COMPAT_FREEBSD32
182 #include <sys/mount.h>
183 #include <sys/socket.h>
184 #include <compat/freebsd32/freebsd32.h>
185 #include <compat/freebsd32/freebsd32_ipc.h>
186 #include <compat/freebsd32/freebsd32_proto.h>
187 #include <compat/freebsd32/freebsd32_signal.h>
188 #include <compat/freebsd32/freebsd32_syscall.h>
189 #include <compat/freebsd32/freebsd32_util.h>
191 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
192 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
194 freebsd32_ipcperm_old_in(struct ipc_perm32_old *ip32, struct ipc_perm *ip)
197 CP(*ip32, *ip, cuid);
198 CP(*ip32, *ip, cgid);
201 CP(*ip32, *ip, mode);
207 freebsd32_ipcperm_old_out(struct ipc_perm *ip, struct ipc_perm32_old *ip32)
210 CP(*ip, *ip32, cuid);
211 CP(*ip, *ip32, cgid);
214 CP(*ip, *ip32, mode);
221 freebsd32_ipcperm_in(struct ipc_perm32 *ip32, struct ipc_perm *ip)
224 CP(*ip32, *ip, cuid);
225 CP(*ip32, *ip, cgid);
228 CP(*ip32, *ip, mode);
234 freebsd32_ipcperm_out(struct ipc_perm *ip, struct ipc_perm32 *ip32)
237 CP(*ip, *ip32, cuid);
238 CP(*ip, *ip32, cgid);
241 CP(*ip, *ip32, mode);