1 /* $NetBSD: linux_mod.c,v 1.17 2024/10/01 16:41:29 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software developed for The NetBSD Foundation
8 * by Andrew Doran.
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: linux_mod.c,v 1.17 2024/10/01 16:41:29 riastradh Exp $");
34
35 #ifdef _KERNEL_OPT
36 #include "opt_execfmt.h"
37 #endif
38
39 #ifndef ELFSIZE
40 #define ELFSIZE ARCH_ELFSIZE
41 #endif
42
43 #include <sys/param.h>
44 #include <sys/module.h>
45 #include <sys/exec.h>
46 #include <sys/signalvar.h>
47 #include <sys/sysctl.h>
48
49 #include <compat/linux/common/linux_inotify.h>
50 #include <compat/linux/common/linux_sysctl.h>
51 #include <compat/linux/common/linux_exec.h>
52
53 #if defined(EXEC_ELF32) && ELFSIZE == 32
54 # define MD1 ",exec_elf32"
55 #else
56 # define MD1 ""
57 #endif
58 #if defined(EXEC_ELF64)
59 # define MD2 ",exec_elf64"
60 #else
61 # define MD2 ""
62 #endif
63 #if defined(EXEC_AOUT)
64 # define MD3 ",exec_aout"
65 #else
66 # define MD3 ""
67 #endif
68
69 #define REQ1 "compat_ossaudio,sysv_ipc,mqueue,compat_util"
70 #define REQ2 ",compat_50,compat_43"
71
72 MODULE(MODULE_CLASS_EXEC, compat_linux, REQ1 REQ2 MD1 MD2 MD3);
73
74 static struct execsw linux_execsw[] = {
75 #if defined(EXEC_ELF32) && ELFSIZE == 32
76 {
77 .es_hdrsz = sizeof (Elf32_Ehdr),
78 .es_makecmds = exec_elf32_makecmds,
79 .u = {
80 .elf_probe_func = linux_elf32_probe,
81 },
82 .es_emul = &emul_linux,
83 .es_prio = EXECSW_PRIO_ANY,
84 .es_arglen = LINUX_ELF_AUX_ARGSIZ,
85 .es_copyargs = linux_elf32_copyargs,
86 .es_setregs = NULL,
87 .es_coredump = coredump_elf32,
88 .es_setup_stack = linux_exec_setup_stack,
89 },
90 #elif defined(EXEC_ELF64)
91 {
92 .es_hdrsz = sizeof (Elf64_Ehdr),
93 .es_makecmds = exec_elf64_makecmds,
94 .u = {
95 .elf_probe_func = linux_elf64_probe,
96 },
97 .es_emul = &emul_linux,
98 .es_prio = EXECSW_PRIO_ANY,
99 .es_arglen = LINUX_ELF_AUX_ARGSIZ,
100 .es_copyargs = linux_elf64_copyargs,
101 .es_setregs = NULL,
102 .es_coredump = coredump_elf64,
103 .es_setup_stack = linux_exec_setup_stack,
104 },
105 #endif
106 #ifdef EXEC_AOUT
107 {
108 .es_hdrsz = LINUX_AOUT_HDR_SIZE,
109 .es_makecmds = exec_linux_aout_makecmds,
110 .u = {
111 .elf_probe_func = NULL,
112 },
113 .es_emul = &emul_linux,
114 .es_prio = EXECSW_PRIO_LAST,
115 .es_arglen = LINUX_AOUT_AUX_ARGSIZ,
116 .es_copyargs = linux_aout_copyargs,
117 .es_setregs = NULL,
118 .es_coredump = coredump_netbsd,
119 .es_setup_stack = linux_exec_setup_stack,
120 },
121 #endif
122 };
123
124 int linux_enabled = 1;
125
126 int
linux_sysctl_enable(SYSCTLFN_ARGS)127 linux_sysctl_enable(SYSCTLFN_ARGS)
128 {
129 struct sysctlnode node;
130 int error, val;
131
132 val = *(int *)rnode->sysctl_data;
133
134 node = *rnode;
135 node.sysctl_data = &val;
136
137 error = sysctl_lookup(SYSCTLFN_CALL(&node));
138 if (error != 0 || newp == NULL)
139 return error;
140
141 if (val == *(int *)rnode->sysctl_data)
142 return 0;
143
144 if (val == 1)
145 error = exec_add(linux_execsw, __arraycount(linux_execsw));
146 else if (val == 0)
147 error = exec_remove(linux_execsw, __arraycount(linux_execsw));
148 else
149 error = EINVAL;
150
151 if (error)
152 return error;
153
154 *(int *)rnode->sysctl_data = val;
155
156 return 0;
157 }
158
159 static int
compat_linux_modcmd(modcmd_t cmd,void * arg)160 compat_linux_modcmd(modcmd_t cmd, void *arg)
161 {
162 int error;
163
164 switch (cmd) {
165 case MODULE_CMD_INIT:
166 error = linux_inotify_init();
167 if (error != 0)
168 return error;
169 error = exec_add(linux_execsw, __arraycount(linux_execsw));
170 if (error)
171 linux_inotify_fini();
172 return error;
173
174 case MODULE_CMD_FINI:
175 error = exec_remove(linux_execsw, __arraycount(linux_execsw));
176 if (error)
177 return error;
178 linux_sysctl_fini();
179 linux_inotify_fini();
180 return 0;
181
182 default:
183 return ENOTTY;
184 }
185 }
186