1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2001 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: releng/11.2/sys/compat/linux/linux_sysctl.c 330997 2018-03-15 12:56:22Z emaste $");
31
32 #include "opt_compat.h"
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/proc.h>
40 #include <sys/sdt.h>
41 #include <sys/sysctl.h>
42 #include <sys/systm.h>
43 #include <sys/sbuf.h>
44
45 #ifdef COMPAT_LINUX32
46 #include <machine/../linux32/linux.h>
47 #include <machine/../linux32/linux32_proto.h>
48 #else
49 #include <machine/../linux/linux.h>
50 #include <machine/../linux/linux_proto.h>
51 #endif
52
53 #include <compat/linux/linux_dtrace.h>
54 #include <compat/linux/linux_misc.h>
55 #include <compat/linux/linux_util.h>
56
57 #define LINUX_CTL_KERN 1
58 #define LINUX_CTL_VM 2
59 #define LINUX_CTL_NET 3
60 #define LINUX_CTL_PROC 4
61 #define LINUX_CTL_FS 5
62 #define LINUX_CTL_DEBUG 6
63 #define LINUX_CTL_DEV 7
64 #define LINUX_CTL_BUS 8
65
66 /* CTL_KERN names */
67 #define LINUX_KERN_OSTYPE 1
68 #define LINUX_KERN_OSRELEASE 2
69 #define LINUX_KERN_OSREV 3
70 #define LINUX_KERN_VERSION 4
71
72 /* DTrace init */
73 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
74
75 /**
76 * DTrace probes in this module.
77 */
78 LIN_SDT_PROBE_DEFINE2(sysctl, handle_string, entry, "struct l___sysctl_args *",
79 "char *");
80 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int");
81 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, return, "int");
82 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, entry, "struct l___sysctl_args *",
83 "struct thread *");
84 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int");
85 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int");
86 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *");
87 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, return, "int");
88
89 static int
90 handle_string(struct l___sysctl_args *la, char *value)
91 {
92 int error;
93
94 LIN_SDT_PROBE2(sysctl, handle_string, entry, la, value);
95
96 if (la->oldval != 0) {
97 l_int len = strlen(value);
98 error = copyout(value, PTRIN(la->oldval), len + 1);
99 if (!error && la->oldlenp != 0)
100 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len));
101 if (error) {
102 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error,
103 error);
104 LIN_SDT_PROBE1(sysctl, handle_string, return, error);
105 return (error);
106 }
107 }
108
109 if (la->newval != 0) {
110 LIN_SDT_PROBE1(sysctl, handle_string, return, ENOTDIR);
111 return (ENOTDIR);
112 }
113
114 LIN_SDT_PROBE1(sysctl, handle_string, return, 0);
115 return (0);
116 }
117
118 int
119 linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
120 {
121 struct l___sysctl_args la;
122 struct sbuf *sb;
123 l_int *mib;
124 char *sysctl_string;
125 int error, i;
126
127 LIN_SDT_PROBE2(sysctl, linux_sysctl, entry, td, args->args);
128
129 error = copyin(args->args, &la, sizeof(la));
130 if (error) {
131 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
132 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
133 return (error);
134 }
135
136 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) {
137 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen,
138 LINUX_CTL_MAXNAME);
139 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR);
140 return (ENOTDIR);
141 }
142
143 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK);
144 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int));
145 if (error) {
146 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
147 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
148 free(mib, M_LINUX);
149 return (error);
150 }
151
152 switch (mib[0]) {
153 case LINUX_CTL_KERN:
154 if (la.nlen < 2)
155 break;
156
157 switch (mib[1]) {
158 case LINUX_KERN_VERSION:
159 error = handle_string(&la, version);
160 free(mib, M_LINUX);
161 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, error);
162 return (error);
163 default:
164 break;
165 }
166 break;
167 default:
168 break;
169 }
170
171 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
172 if (sb == NULL) {
173 linux_msg(td, "sysctl is not implemented");
174 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
175 "unknown sysctl, ENOMEM during lookup");
176 } else {
177 sbuf_printf(sb, "sysctl ");
178 for (i = 0; i < la.nlen; i++)
179 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
180 sbuf_printf(sb, "} is not implemented");
181 sbuf_finish(sb);
182 sysctl_string = sbuf_data(sb);
183 linux_msg(td, "%s", sbuf_data(sb));
184 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
185 sysctl_string);
186 sbuf_delete(sb);
187 }
188
189 free(mib, M_LINUX);
190
191 LIN_SDT_PROBE1(sysctl, linux_sysctl, return, ENOTDIR);
192 return (ENOTDIR);
193 }
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