1 | /* $NetBSD: sysv_ipc_50.c,v 1.4 2015/12/03 00:28:55 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 1.4 2015/12/03 00:28:55 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 | #ifdef COMPAT_50 |
62 | #include <compat/sys/ipc.h> |
63 | #ifdef SYSVMSG |
64 | #include <compat/sys/msg.h> |
65 | #endif |
66 | #ifdef SYSVSEM |
67 | #include <compat/sys/sem.h> |
68 | #endif |
69 | #ifdef SYSVSHM |
70 | #include <compat/sys/shm.h> |
71 | #endif |
72 | |
73 | /* |
74 | * Check for ipc permission |
75 | */ |
76 | |
77 | int sysctl_kern_sysvipc50(SYSCTLFN_PROTO); |
78 | |
79 | int |
80 | sysctl_kern_sysvipc50(SYSCTLFN_ARGS) |
81 | { |
82 | void *where = oldp; |
83 | size_t *sizep = oldlenp; |
84 | #ifdef SYSVMSG |
85 | struct msg_sysctl_info50 *msgsi = NULL; |
86 | #endif |
87 | #ifdef SYSVSEM |
88 | struct sem_sysctl_info50 *semsi = NULL; |
89 | #endif |
90 | #ifdef SYSVSHM |
91 | struct shm_sysctl_info50 *shmsi = NULL; |
92 | #endif |
93 | size_t infosize, dssize, tsize, buflen; |
94 | void *bf = NULL; |
95 | char *start; |
96 | int32_t nds; |
97 | int i, error, ret; |
98 | |
99 | if (namelen != 1) |
100 | return EINVAL; |
101 | |
102 | start = where; |
103 | buflen = *sizep; |
104 | |
105 | switch (*name) { |
106 | case KERN_SYSVIPC_OMSG_INFO: |
107 | #ifdef SYSVMSG |
108 | infosize = sizeof(msgsi->msginfo); |
109 | nds = msginfo.msgmni; |
110 | dssize = sizeof(msgsi->msgids[0]); |
111 | break; |
112 | #else |
113 | return EINVAL; |
114 | #endif |
115 | case KERN_SYSVIPC_OSEM_INFO: |
116 | #ifdef SYSVSEM |
117 | infosize = sizeof(semsi->seminfo); |
118 | nds = seminfo.semmni; |
119 | dssize = sizeof(semsi->semids[0]); |
120 | break; |
121 | #else |
122 | return EINVAL; |
123 | #endif |
124 | case KERN_SYSVIPC_OSHM_INFO: |
125 | #ifdef SYSVSHM |
126 | infosize = sizeof(shmsi->shminfo); |
127 | nds = shminfo.shmmni; |
128 | dssize = sizeof(shmsi->shmids[0]); |
129 | break; |
130 | #else |
131 | return EINVAL; |
132 | #endif |
133 | default: |
134 | return EPASSTHROUGH; |
135 | } |
136 | /* |
137 | * Round infosize to 64 bit boundary if requesting more than just |
138 | * the info structure or getting the total data size. |
139 | */ |
140 | if (where == NULL || *sizep > infosize) |
141 | infosize = roundup(infosize, sizeof(quad_t)); |
142 | tsize = infosize + nds * dssize; |
143 | |
144 | /* Return just the total size required. */ |
145 | if (where == NULL) { |
146 | *sizep = tsize; |
147 | return 0; |
148 | } |
149 | |
150 | /* Not enough room for even the info struct. */ |
151 | if (buflen < infosize) { |
152 | *sizep = 0; |
153 | return ENOMEM; |
154 | } |
155 | bf = malloc(min(tsize, buflen), M_TEMP, M_WAITOK | M_ZERO); |
156 | |
157 | switch (*name) { |
158 | #ifdef SYSVMSG |
159 | case KERN_SYSVIPC_OMSG_INFO: |
160 | msgsi = (struct msg_sysctl_info50 *)bf; |
161 | msgsi->msginfo = msginfo; |
162 | break; |
163 | #endif |
164 | #ifdef SYSVSEM |
165 | case KERN_SYSVIPC_OSEM_INFO: |
166 | semsi = (struct sem_sysctl_info50 *)bf; |
167 | semsi->seminfo = seminfo; |
168 | break; |
169 | #endif |
170 | #ifdef SYSVSHM |
171 | case KERN_SYSVIPC_OSHM_INFO: |
172 | shmsi = (struct shm_sysctl_info50 *)bf; |
173 | shmsi->shminfo = shminfo; |
174 | break; |
175 | #endif |
176 | } |
177 | buflen -= infosize; |
178 | |
179 | ret = 0; |
180 | if (buflen > 0) { |
181 | /* Fill in the IPC data structures. */ |
182 | for (i = 0; i < nds; i++) { |
183 | if (buflen < dssize) { |
184 | ret = ENOMEM; |
185 | break; |
186 | } |
187 | switch (*name) { |
188 | #ifdef SYSVMSG |
189 | case KERN_SYSVIPC_OMSG_INFO: |
190 | mutex_enter(&msgmutex); |
191 | SYSCTL_FILL_MSG(msqs[i].msq_u, msgsi->msgids[i]); |
192 | mutex_exit(&msgmutex); |
193 | break; |
194 | #endif |
195 | #ifdef SYSVSEM |
196 | case KERN_SYSVIPC_OSEM_INFO: |
197 | SYSCTL_FILL_SEM(sema[i], semsi->semids[i]); |
198 | break; |
199 | #endif |
200 | #ifdef SYSVSHM |
201 | case KERN_SYSVIPC_OSHM_INFO: |
202 | SYSCTL_FILL_SHM(shmsegs[i], shmsi->shmids[i]); |
203 | break; |
204 | #endif |
205 | } |
206 | buflen -= dssize; |
207 | } |
208 | } |
209 | *sizep -= buflen; |
210 | error = copyout(bf, start, *sizep); |
211 | /* If copyout succeeded, use return code set earlier. */ |
212 | if (error == 0) |
213 | error = ret; |
214 | if (bf) |
215 | free(bf, M_TEMP); |
216 | return error; |
217 | } |
218 | #endif /* COMPAT_50 */ |
219 | |