1 /* $NetBSD: linux_mod.c,v 1.14 2020/04/26 18:53:33 thorpej 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 1.14 2020/04/26 18:53:33 thorpej 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_sysctl.h>
50 #include <compat/linux/common/linux_exec.h>
51
52 #if defined(EXEC_ELF32) && ELFSIZE == 32
53 # define MD1 ",exec_elf32"
54 #else
55 # define MD1 ""
56 #endif
57 #if defined(EXEC_ELF64)
58 # define MD2 ",exec_elf64"
59 #else
60 # define MD2 ""
61 #endif
62 #if defined(EXEC_AOUT)
63 # define MD3 ",exec_aout"
64 #else
65 # define MD3 ""
66 #endif
67
68 #define REQ1 "compat_ossaudio,sysv_ipc,compat_util"
69 #define REQ2 ",compat_50,compat_43"
70
71 MODULE(MODULE_CLASS_EXEC, compat_linux, REQ1 REQ2 MD1 MD2 MD3);
72
73 static struct execsw linux_execsw[] = {
74 #if defined(EXEC_ELF32) && ELFSIZE == 32
75 {
76 .es_hdrsz = sizeof (Elf32_Ehdr),
77 .es_makecmds = exec_elf32_makecmds,
78 .u = {
79 .elf_probe_func = linux_elf32_probe,
80 },
81 .es_emul = &emul_linux,
82 .es_prio = EXECSW_PRIO_ANY,
83 .es_arglen = LINUX_ELF_AUX_ARGSIZ,
84 .es_copyargs = linux_elf32_copyargs,
85 .es_setregs = NULL,
86 .es_coredump = coredump_elf32,
87 .es_setup_stack = linux_exec_setup_stack,
88 },
89 #elif defined(EXEC_ELF64)
90 {
91 .es_hdrsz = sizeof (Elf64_Ehdr),
92 .es_makecmds = exec_elf64_makecmds,
93 .u = {
94 .elf_probe_func = linux_elf64_probe,
95 },
96 .es_emul = &emul_linux,
97 .es_prio = EXECSW_PRIO_ANY,
98 .es_arglen = LINUX_ELF_AUX_ARGSIZ,
99 .es_copyargs = linux_elf64_copyargs,
100 .es_setregs = NULL,
101 .es_coredump = coredump_elf64,
102 .es_setup_stack = linux_exec_setup_stack,
103 },
104 #endif
105 #ifdef EXEC_AOUT
106 {
107 .es_hdrsz = LINUX_AOUT_HDR_SIZE,
108 .es_makecmds = exec_linux_aout_makecmds,
109 .u = {
110 .elf_probe_func = NULL,
111 },
112 .es_emul = &emul_linux,
113 .es_prio = EXECSW_PRIO_LAST,
114 .es_arglen = LINUX_AOUT_AUX_ARGSIZ,
115 .es_copyargs = linux_aout_copyargs,
116 .es_setregs = NULL,
117 .es_coredump = coredump_netbsd,
118 .es_setup_stack = linux_exec_setup_stack,
119 },
120 #endif
121 };
122
123 int linux_enabled = 1;
124
125 int
linux_sysctl_enable(SYSCTLFN_ARGS)126 linux_sysctl_enable(SYSCTLFN_ARGS)
127 {
128 struct sysctlnode node;
129 int error, val;
130
131 val = *(int *)rnode->sysctl_data;
132
133 node = *rnode;
134 node.sysctl_data = &val;
135
136 error = sysctl_lookup(SYSCTLFN_CALL(&node));
137 if (error != 0 || newp == NULL)
138 return error;
139
140 if (val == *(int *)rnode->sysctl_data)
141 return 0;
142
143 if (val == 1)
144 error = exec_add(linux_execsw, __arraycount(linux_execsw));
145 else if (val == 0)
146 error = exec_remove(linux_execsw, __arraycount(linux_execsw));
147 else
148 error = EINVAL;
149
150 if (error)
151 return error;
152
153 *(int *)rnode->sysctl_data = val;
154
155 return 0;
156 }
157
158 static int
compat_linux_modcmd(modcmd_t cmd,void * arg)159 compat_linux_modcmd(modcmd_t cmd, void *arg)
160 {
161 int error;
162
163 switch (cmd) {
164 case MODULE_CMD_INIT:
165 error = exec_add(linux_execsw, __arraycount(linux_execsw));
166 return error;
167
168 case MODULE_CMD_FINI:
169 error = exec_remove(linux_execsw, __arraycount(linux_execsw));
170 if (error)
171 return error;
172 linux_sysctl_fini();
173 return 0;
174
175 default:
176 return ENOTTY;
177 }
178 }
179