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>
53 void (*shmfork_hook)(struct proc *, struct proc *) = NULL;
54 void (*shmexit_hook)(struct vmspace *) = NULL;
56 /* called from kern_fork.c */
62 if (shmfork_hook != NULL)
67 /* called from kern_exit.c */
69 shmexit(struct vmspace *vm)
72 if (shmexit_hook != NULL)
78 * Check for IPC permission.
80 * Note: The MAC Framework does not require any modifications to the
81 * ipcperm() function, as access control checks are performed throughout the
82 * implementation of each primitive. Those entry point calls complement the
83 * ipcperm() discertionary checks. Unlike file system discretionary access
84 * control, the original create of an object is given the same rights as the
88 ipcperm(struct thread *td, struct ipc_perm *perm, int acc_mode)
90 struct ucred *cred = td->td_ucred;
91 int error, obj_mode, dac_granted, priv_granted;
94 if (cred->cr_uid == perm->cuid || cred->cr_uid == perm->uid) {
95 obj_mode = perm->mode;
97 } else if (groupmember(perm->gid, cred) ||
98 groupmember(perm->cgid, cred)) {
99 obj_mode = perm->mode;
102 obj_mode = perm->mode;
107 * While the System V IPC permission model allows IPC_M to be
108 * granted, as part of the mode, our implementation requires
109 * privilege to adminster the object if not the owner or creator.
112 if (obj_mode & IPC_M)
113 dac_granted |= IPC_M;
115 if (obj_mode & IPC_R)
116 dac_granted |= IPC_R;
117 if (obj_mode & IPC_W)
118 dac_granted |= IPC_W;
121 * Simple case: all required rights are granted by DAC.
123 if ((dac_granted & acc_mode) == acc_mode)
127 * Privilege is required to satisfy the request.
130 if ((acc_mode & IPC_M) && !(dac_granted & IPC_M)) {
131 error = priv_check(td, PRIV_IPC_ADMIN);
133 priv_granted |= IPC_M;
136 if ((acc_mode & IPC_R) && !(dac_granted & IPC_R)) {
137 error = priv_check(td, PRIV_IPC_READ);
139 priv_granted |= IPC_R;
142 if ((acc_mode & IPC_W) && !(dac_granted & IPC_W)) {
143 error = priv_check(td, PRIV_IPC_WRITE);
145 priv_granted |= IPC_W;
148 if (((dac_granted | priv_granted) & acc_mode) == acc_mode)
154 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
155 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
157 ipcperm_old2new(struct ipc_perm_old *old, struct ipc_perm *new)
160 new->cuid = old->cuid;
161 new->cgid = old->cgid;
164 new->mode = old->mode;
170 ipcperm_new2old(struct ipc_perm *new, struct ipc_perm_old *old)
173 /* XXX: How to handle ID's > USHORT_MAX? */
174 old->cuid = new->cuid;
175 old->cgid = new->cgid;
178 old->mode = new->mode;
184 #ifdef COMPAT_FREEBSD32
185 #include <sys/mount.h>
186 #include <sys/socket.h>
187 #include <compat/freebsd32/freebsd32.h>
188 #include <compat/freebsd32/freebsd32_ipc.h>
189 #include <compat/freebsd32/freebsd32_proto.h>
190 #include <compat/freebsd32/freebsd32_signal.h>
191 #include <compat/freebsd32/freebsd32_syscall.h>
192 #include <compat/freebsd32/freebsd32_util.h>
194 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
195 defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
197 freebsd32_ipcperm_old_in(struct ipc_perm32_old *ip32, struct ipc_perm *ip)
200 CP(*ip32, *ip, cuid);
201 CP(*ip32, *ip, cgid);
204 CP(*ip32, *ip, mode);
210 freebsd32_ipcperm_old_out(struct ipc_perm *ip, struct ipc_perm32_old *ip32)
213 CP(*ip, *ip32, cuid);
214 CP(*ip, *ip32, cgid);
217 CP(*ip, *ip32, mode);
224 freebsd32_ipcperm_in(struct ipc_perm32 *ip32, struct ipc_perm *ip)
227 CP(*ip32, *ip, cuid);
228 CP(*ip32, *ip, cgid);
231 CP(*ip32, *ip, mode);
237 freebsd32_ipcperm_out(struct ipc_perm *ip, struct ipc_perm32 *ip32)
240 CP(*ip, *ip32, cuid);
241 CP(*ip, *ip32, cgid);
244 CP(*ip, *ip32, mode);