1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/lock.h>
31 #include <sys/malloc.h>
32 #include <sys/mutex.h>
33 #include <sys/sysctl.h>
34 #include <sys/sbuf.h>
35 #include <sys/vnode.h>
36
37 #ifdef COMPAT_LINUX32
38 #include <machine/../linux32/linux.h>
39 #include <machine/../linux32/linux32_proto.h>
40 #else
41 #include <machine/../linux/linux.h>
42 #include <machine/../linux/linux_proto.h>
43 #endif
44
45 #include <compat/linux/linux_dtrace.h>
46 #include <compat/linux/linux_misc.h>
47 #include <compat/linux/linux_util.h>
48
49 #define LINUX_CTL_KERN 1
50 #define LINUX_CTL_VM 2
51 #define LINUX_CTL_NET 3
52 #define LINUX_CTL_PROC 4
53 #define LINUX_CTL_FS 5
54 #define LINUX_CTL_DEBUG 6
55 #define LINUX_CTL_DEV 7
56 #define LINUX_CTL_BUS 8
57
58 /* CTL_KERN names */
59 #define LINUX_KERN_OSTYPE 1
60 #define LINUX_KERN_OSRELEASE 2
61 #define LINUX_KERN_OSREV 3
62 #define LINUX_KERN_VERSION 4
63
64 /* DTrace init */
65 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
66
67 /**
68 * DTrace probes in this module.
69 */
70 LIN_SDT_PROBE_DEFINE1(sysctl, handle_string, copyout_error, "int");
71 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, copyin_error, "int");
72 LIN_SDT_PROBE_DEFINE2(sysctl, linux_sysctl, wrong_length, "int", "int");
73 LIN_SDT_PROBE_DEFINE1(sysctl, linux_sysctl, unsupported_sysctl, "char *");
74
75 #ifdef LINUX_LEGACY_SYSCALLS
76 static int
handle_string(struct l___sysctl_args * la,const char * value)77 handle_string(struct l___sysctl_args *la, const char *value)
78 {
79 int error;
80
81 if (la->oldval != 0) {
82 l_int len = strlen(value);
83 error = copyout(value, PTRIN(la->oldval), len + 1);
84 if (!error && la->oldlenp != 0)
85 error = copyout(&len, PTRIN(la->oldlenp), sizeof(len));
86 if (error) {
87 LIN_SDT_PROBE1(sysctl, handle_string, copyout_error,
88 error);
89 return (error);
90 }
91 }
92
93 if (la->newval != 0)
94 return (ENOTDIR);
95
96 return (0);
97 }
98
99 int
linux_sysctl(struct thread * td,struct linux_sysctl_args * args)100 linux_sysctl(struct thread *td, struct linux_sysctl_args *args)
101 {
102 struct l___sysctl_args la;
103 struct sbuf *sb;
104 l_int *mib;
105 char *sysctl_string;
106 int error, i;
107
108 error = copyin(args->args, &la, sizeof(la));
109 if (error) {
110 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
111 return (error);
112 }
113
114 if (la.nlen <= 0 || la.nlen > LINUX_CTL_MAXNAME) {
115 LIN_SDT_PROBE2(sysctl, linux_sysctl, wrong_length, la.nlen,
116 LINUX_CTL_MAXNAME);
117 return (ENOTDIR);
118 }
119
120 mib = malloc(la.nlen * sizeof(l_int), M_LINUX, M_WAITOK);
121 error = copyin(PTRIN(la.name), mib, la.nlen * sizeof(l_int));
122 if (error) {
123 LIN_SDT_PROBE1(sysctl, linux_sysctl, copyin_error, error);
124 free(mib, M_LINUX);
125 return (error);
126 }
127
128 switch (mib[0]) {
129 case LINUX_CTL_KERN:
130 if (la.nlen < 2)
131 break;
132
133 switch (mib[1]) {
134 case LINUX_KERN_VERSION:
135 error = handle_string(&la, version);
136 free(mib, M_LINUX);
137 return (error);
138 default:
139 break;
140 }
141 break;
142 default:
143 break;
144 }
145
146 sb = sbuf_new(NULL, NULL, 20 + la.nlen * 5, SBUF_AUTOEXTEND);
147 if (sb == NULL) {
148 linux_msg(td, "sysctl is not implemented");
149 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
150 "unknown sysctl, ENOMEM during lookup");
151 } else {
152 sbuf_printf(sb, "sysctl ");
153 for (i = 0; i < la.nlen; i++)
154 sbuf_printf(sb, "%c%d", (i) ? ',' : '{', mib[i]);
155 sbuf_printf(sb, "} is not implemented");
156 sbuf_finish(sb);
157 sysctl_string = sbuf_data(sb);
158 linux_msg(td, "%s", sysctl_string);
159 LIN_SDT_PROBE1(sysctl, linux_sysctl, unsupported_sysctl,
160 sysctl_string);
161 sbuf_delete(sb);
162 }
163
164 free(mib, M_LINUX);
165
166 return (ENOTDIR);
167 }
168 #endif
169