1 /* $NetBSD: sysv_ipc_50.c,v 1.6 2019/01/27 02:08:39 pgoyette Exp $ */
2
3 /*-
4 * Copyright (c) 1998, 2007 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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: sysv_ipc_50.c,v 1.6 2019/01/27 02:08:39 pgoyette Exp $");
34
35 #ifdef _KERNEL_OPT
36 #include "opt_sysv.h"
37 #include "opt_compat_netbsd.h"
38 #endif
39
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/proc.h>
43 #include <sys/ipc.h>
44 #ifdef SYSVMSG
45 #include <sys/msg.h>
46 #endif
47 #ifdef SYSVSEM
48 #include <sys/sem.h>
49 #endif
50 #ifdef SYSVSHM
51 #include <sys/shm.h>
52 #endif
53 #include <sys/systm.h>
54 #include <sys/malloc.h>
55 #include <sys/mount.h>
56 #include <sys/vnode.h>
57 #include <sys/stat.h>
58 #include <sys/sysctl.h>
59 #include <sys/kauth.h>
60
61 #include <compat/sys/ipc.h>
62 #ifdef SYSVMSG
63 #include <compat/sys/msg.h>
64 #endif
65 #ifdef SYSVSEM
66 #include <compat/sys/sem.h>
67 #endif
68 #ifdef SYSVSHM
69 #include <compat/sys/shm.h>
70 #endif
71
72 /*
73 * Check for ipc permission
74 */
75
76 int
sysctl_kern_sysvipc50(SYSCTLFN_ARGS)77 sysctl_kern_sysvipc50(SYSCTLFN_ARGS)
78 {
79 void *where = oldp;
80 size_t *sizep = oldlenp;
81 #ifdef SYSVMSG
82 struct msg_sysctl_info50 *msgsi = NULL;
83 #endif
84 #ifdef SYSVSEM
85 struct sem_sysctl_info50 *semsi = NULL;
86 #endif
87 #ifdef SYSVSHM
88 struct shm_sysctl_info50 *shmsi = NULL;
89 #endif
90 size_t infosize, dssize, tsize, buflen;
91 void *bf = NULL;
92 char *start;
93 int32_t nds;
94 int i, error, ret;
95
96 if (namelen != 1)
97 return EINVAL;
98
99 start = where;
100 buflen = *sizep;
101
102 switch (*name) {
103 case KERN_SYSVIPC_OMSG_INFO:
104 #ifdef SYSVMSG
105 infosize = sizeof(msgsi->msginfo);
106 nds = msginfo.msgmni;
107 dssize = sizeof(msgsi->msgids[0]);
108 break;
109 #else
110 return EINVAL;
111 #endif
112 case KERN_SYSVIPC_OSEM_INFO:
113 #ifdef SYSVSEM
114 infosize = sizeof(semsi->seminfo);
115 nds = seminfo.semmni;
116 dssize = sizeof(semsi->semids[0]);
117 break;
118 #else
119 return EINVAL;
120 #endif
121 case KERN_SYSVIPC_OSHM_INFO:
122 #ifdef SYSVSHM
123 infosize = sizeof(shmsi->shminfo);
124 nds = shminfo.shmmni;
125 dssize = sizeof(shmsi->shmids[0]);
126 break;
127 #else
128 return EINVAL;
129 #endif
130 default:
131 return EPASSTHROUGH;
132 }
133 /*
134 * Round infosize to 64 bit boundary if requesting more than just
135 * the info structure or getting the total data size.
136 */
137 if (where == NULL || *sizep > infosize)
138 infosize = roundup(infosize, sizeof(quad_t));
139 tsize = infosize + nds * dssize;
140
141 /* Return just the total size required. */
142 if (where == NULL) {
143 *sizep = tsize;
144 return 0;
145 }
146
147 /* Not enough room for even the info struct. */
148 if (buflen < infosize) {
149 *sizep = 0;
150 return ENOMEM;
151 }
152 bf = malloc(uimin(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO);
153
154 switch (*name) {
155 #ifdef SYSVMSG
156 case KERN_SYSVIPC_OMSG_INFO:
157 msgsi = (struct msg_sysctl_info50 *)bf;
158 msgsi->msginfo = msginfo;
159 break;
160 #endif
161 #ifdef SYSVSEM
162 case KERN_SYSVIPC_OSEM_INFO:
163 semsi = (struct sem_sysctl_info50 *)bf;
164 semsi->seminfo = seminfo;
165 break;
166 #endif
167 #ifdef SYSVSHM
168 case KERN_SYSVIPC_OSHM_INFO:
169 shmsi = (struct shm_sysctl_info50 *)bf;
170 shmsi->shminfo = shminfo;
171 break;
172 #endif
173 }
174 buflen -= infosize;
175
176 ret = 0;
177 if (buflen > 0) {
178 /* Fill in the IPC data structures. */
179 for (i = 0; i < nds; i++) {
180 if (buflen < dssize) {
181 ret = ENOMEM;
182 break;
183 }
184 switch (*name) {
185 #ifdef SYSVMSG
186 case KERN_SYSVIPC_OMSG_INFO:
187 mutex_enter(&msgmutex);
188 SYSCTL_FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]);
189 mutex_exit(&msgmutex);
190 break;
191 #endif
192 #ifdef SYSVSEM
193 case KERN_SYSVIPC_OSEM_INFO:
194 SYSCTL_FILL_SEM(sema[i], semsi->semids[i]);
195 break;
196 #endif
197 #ifdef SYSVSHM
198 case KERN_SYSVIPC_OSHM_INFO:
199 SYSCTL_FILL_SHM(shmsegs[i], shmsi->shmids[i]);
200 break;
201 #endif
202 }
203 buflen -= dssize;
204 }
205 }
206 *sizep -= buflen;
207 error = copyout(bf, start, *sizep);
208 /* If copyout succeeded, use return code set earlier. */
209 if (error == 0)
210 error = ret;
211 if (bf)
212 free(bf, M_TEMP);
213 return error;
214 }
215