1/* $NetBSD: linux32_sysctl.c,v 1.16 2014/05/16 12:22:32 martin Exp $ */
2
3/*-
4 * Copyright (c) 2006 Emmanuel Dreyfus, all rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by Emmanuel Dreyfus
17 * 4. The name of the author may not be used to endorse or promote
18 * products derived from this software without specific prior written
19 * permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: linux32_sysctl.c,v 1.16 2014/05/16 12:22:32 martin Exp $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/errno.h>
39#include <sys/proc.h>
40#include <sys/mount.h>
41#include <sys/sysctl.h>
42#include <sys/syscallargs.h>
43#include <sys/ktrace.h>
44
45#include <compat/netbsd32/netbsd32.h>
46
47#include <compat/linux/common/linux_types.h>
48#include <compat/linux/common/linux_signal.h>
49#include <compat/linux/common/linux_sysctl.h>
50#include <compat/linux/common/linux_ipc.h>
51#include <compat/linux/common/linux_sem.h>
52#include <compat/linux/linux_syscallargs.h>
53
54#include <compat/linux32/common/linux32_types.h>
55#include <compat/linux32/common/linux32_signal.h>
56#include <compat/linux32/common/linux32_sysctl.h>
57#include <compat/linux32/linux32_syscallargs.h>
58
59char linux32_sysname[128] = "Linux";
60char linux32_release[128] = "3.11.6";
61char linux32_version[128] = "#1 SMP PREEMPT Thu Oct 24 16:23:02 UTC 2013";
62
63struct sysctlnode linux32_sysctl_root = {
64 .sysctl_flags = SYSCTL_VERSION|
65 CTLFLAG_ROOT|CTLTYPE_NODE|CTLFLAG_READWRITE,
66 .sysctl_num = 0,
67 .sysctl_name = "(linux32_root)",
68 .sysctl_size = sizeof(struct sysctlnode),
69};
70
71static struct sysctllog *linux32_clog1;
72static struct sysctllog *linux32_clog2;
73
74void
75linux32_sysctl_fini(void)
76{
77
78 sysctl_teardown(&linux32_clog2);
79 sysctl_teardown(&linux32_clog1);
80 sysctl_free(&linux32_sysctl_root);
81}
82
83void
84linux32_sysctl_init(void)
85{
86 const struct sysctlnode *node = &linux32_sysctl_root;
87
88 sysctl_createv(&linux32_clog1, 0, NULL, NULL,
89 CTLFLAG_PERMANENT,
90 CTLTYPE_NODE, "linux32",
91 SYSCTL_DESCR("Linux 32 bit emulation settings"),
92 NULL, 0, NULL, 0,
93 CTL_EMUL, EMUL_LINUX32, CTL_EOL);
94 sysctl_createv(&linux32_clog1, 0, NULL, NULL,
95 CTLFLAG_PERMANENT,
96 CTLTYPE_NODE, "kern",
97 SYSCTL_DESCR("Linux 32 bit kernel emulation settings"),
98 NULL, 0, NULL, 0,
99 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN, CTL_EOL);
100
101 sysctl_createv(&linux32_clog1, 0, NULL, NULL,
102 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
103 CTLTYPE_STRING, "ostype",
104 SYSCTL_DESCR("Linux 32 bit operating system type"),
105 NULL, 0, linux32_sysname, sizeof(linux32_sysname),
106 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN,
107 EMUL_LINUX32_KERN_OSTYPE, CTL_EOL);
108 sysctl_createv(&linux32_clog1, 0, NULL, NULL,
109 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
110 CTLTYPE_STRING, "osrelease",
111 SYSCTL_DESCR("Linux 32 bit operating system release"),
112 NULL, 0, linux32_release, sizeof(linux32_release),
113 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN,
114 EMUL_LINUX32_KERN_OSRELEASE, CTL_EOL);
115 sysctl_createv(&linux32_clog1, 0, NULL, NULL,
116 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
117 CTLTYPE_STRING, "osversion",
118 SYSCTL_DESCR("Linux 32 bit operating system revision"),
119 NULL, 0, linux32_version, sizeof(linux32_version),
120 CTL_EMUL, EMUL_LINUX32, EMUL_LINUX32_KERN,
121 EMUL_LINUX32_KERN_VERSION, CTL_EOL);
122
123 sysctl_createv(&linux32_clog2, 0, &node, &node,
124 CTLFLAG_PERMANENT,
125 CTLTYPE_NODE, "kern", NULL,
126 NULL, 0, NULL, 0,
127 LINUX_CTL_KERN, CTL_EOL);
128
129 sysctl_createv(&linux32_clog2, 0, &node, NULL,
130 CTLFLAG_PERMANENT,
131 CTLTYPE_STRING, "ostype", NULL,
132 NULL, 0, linux32_sysname, sizeof(linux32_sysname),
133 LINUX_KERN_OSTYPE, CTL_EOL);
134 sysctl_createv(&linux32_clog2, 0, &node, NULL,
135 CTLFLAG_PERMANENT,
136 CTLTYPE_STRING, "osrelease", NULL,
137 NULL, 0, linux32_release, sizeof(linux32_release),
138 LINUX_KERN_OSRELEASE, CTL_EOL);
139 sysctl_createv(&linux32_clog2, 0, &node, NULL,
140 CTLFLAG_PERMANENT,
141 CTLTYPE_STRING, "version", NULL,
142 NULL, 0, linux32_version, sizeof(linux32_version),
143 LINUX_KERN_VERSION, CTL_EOL);
144
145 linux32_sysctl_root.sysctl_flags &= ~CTLFLAG_READWRITE;
146}
147
148int
149linux32_sys___sysctl(struct lwp *l, const struct linux32_sys___sysctl_args *uap, register_t *retval)
150{
151 /* {
152 syscallarg(linux32___sysctlp_t) lsp;
153 } */
154 struct linux32_sysctl ls32;
155 int name[CTL_MAXNAME];
156 size_t savelen;
157 netbsd32_size_t oldlen32;
158 size_t oldlen;
159 int error;
160
161 /*
162 * Read sysctl arguments
163 */
164 if ((error = copyin(SCARG_P32(uap, lsp), &ls32, sizeof(ls32))) != 0)
165 return error;
166
167 /*
168 * Read oldlen
169 */
170 if (NETBSD32PTR64(ls32.oldlenp) != NULL) {
171 if ((error = copyin(NETBSD32PTR64(ls32.oldlenp),
172 &oldlen32, sizeof(oldlen32))) != 0)
173 return error;
174 } else {
175 oldlen32 = 0;
176 }
177
178 savelen = (size_t)oldlen32;
179
180 /*
181 * Sanity check nlen
182 */
183 if ((ls32.nlen > CTL_MAXNAME) || (ls32.nlen < 1))
184 return ENOTDIR;
185
186 /*
187 * Read the sysctl name
188 */
189 if ((error = copyin(NETBSD32PTR64(ls32.name), &name,
190 ls32.nlen * sizeof(int))) != 0)
191 return error;
192
193 ktrmib(name, ls32.nlen);
194 /*
195 * First try linux32 tree, then linux tree
196 */
197 oldlen = (size_t)oldlen32;
198 sysctl_lock(NETBSD32PTR64(ls32.newval) != NULL);
199 error = sysctl_dispatch(name, ls32.nlen,
200 NETBSD32PTR64(ls32.oldval), &oldlen,
201 NETBSD32PTR64(ls32.newval), ls32.newlen,
202 name, l, &linux32_sysctl_root);
203 oldlen32 = (netbsd32_size_t)oldlen;
204 sysctl_unlock();
205
206 /*
207 * Check for oldlen overflow (not likely, but who knows...)
208 */
209 if (oldlen != oldlen32) {
210#ifdef DEBUG_LINUX
211 printf("%s: oldlen32 = %d, oldlen = %ld\n",
212 __func__, oldlen32, oldlen);
213#endif
214 return EINVAL;
215 }
216
217 /*
218 * set caller's oldlen, even if we got an error
219 */
220 if (NETBSD32PTR64(ls32.oldlenp)) {
221 int nerror;
222
223 nerror = copyout(&oldlen32,
224 NETBSD32PTR64(ls32.oldlenp), sizeof(oldlen32));
225
226 if (error == 0)
227 error = nerror;
228 }
229
230 /*
231 * oldlen was too short
232 */
233 if ((error == 0) &&
234 (NETBSD32PTR64(ls32.oldval) != NULL) &&
235 (savelen < oldlen32))
236 error = ENOMEM;
237
238 return error;
239}
240