1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/* $OpenBSD: sysv_ipc.c,v 1.3 1998/06/11 18:32:13 deraadt Exp $ */
/* $NetBSD: sysv_ipc.c,v 1.10 1995/06/03 05:53:28 mycroft Exp $ */
/*
* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles M. Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/ipc.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/vnode.h>
/*
* Check for ipc permission
*/
int
ipcperm(cred, perm, mode)
struct ucred *cred;
struct ipc_perm *perm;
int mode;
{
if (mode == IPC_M) {
if (cred->cr_uid == 0 ||
cred->cr_uid == perm->uid ||
cred->cr_uid == perm->cuid)
return (0);
return (EPERM);
}
if (vaccess(perm->mode, perm->uid, perm->gid, mode, cred) == 0 ||
vaccess(perm->mode, perm->cuid, perm->cgid, mode, cred) == 0)
return (0);
return (EACCES);
}
void
ipc_n2o(n, o)
struct ipc_perm *n;
struct oipc_perm *o;
{
o->cuid = n->cuid; /* XXX */
o->cgid = n->cgid; /* XXX */
o->uid = n->uid; /* XXX */
o->gid = n->gid; /* XXX */
o->mode = n->mode; /* XXX */
o->seq = n->seq;
o->key = n->key;
}
void
ipc_o2n(o, n)
struct oipc_perm *o;
struct ipc_perm *n;
{
n->cuid = o->cuid; /* XXX */
n->cgid = o->cgid; /* XXX */
n->uid = o->uid; /* XXX */
n->gid = o->gid; /* XXX */
n->mode = o->mode; /* XXX */
n->seq = o->seq;
n->key = o->key;
}
|
