1 /* $NetBSD: linux32_mod.c,v 1.15 2021/11/25 02:38:56 ryo 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: linux32_mod.c,v 1.15 2021/11/25 02:38:56 ryo 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_exec.h>
50
51 #include <compat/linux32/common/linux32_sysctl.h>
52 #include <compat/linux32/common/linux32_exec.h>
53
54 #if defined(EXEC_ELF32)
55 # define MD1 ",exec_elf32,compat_netbsd32,compat_netbsd32_sysvipc"
56 #else
57 # define MD1 ""
58 #endif
59
60 #define REQ1 "compat_linux,sysv_ipc,compat_sysv_50"
61 #define REQ2 ",compat_netbsd32_50,compat_netbsd32_43"
62
63 MODULE(MODULE_CLASS_EXEC, compat_linux32, REQ1 REQ2 MD1);
64
65 static struct execsw linux32_execsw[] = {
66 #if defined(EXEC_ELF32)
67 {
68 .es_hdrsz = sizeof (Elf32_Ehdr),
69 .es_makecmds = exec_elf32_makecmds,
70 .u = {
71 .elf_probe_func = linux32_elf32_probe,
72 },
73 .es_emul = &emul_linux32,
74 .es_prio = EXECSW_PRIO_ANY,
75 .es_arglen = LINUX32_ELF_AUX_ARGSIZ,
76 .es_copyargs = linux32_elf32_copyargs,
77 .es_setregs = NULL,
78 .es_coredump = coredump_elf32,
79 .es_setup_stack = linux32_exec_setup_stack,
80 },
81 #endif
82 };
83
84 int linux32_enabled = 1;
85
86 int
linux32_sysctl_enable(SYSCTLFN_ARGS)87 linux32_sysctl_enable(SYSCTLFN_ARGS)
88 {
89 struct sysctlnode node;
90 int error, val;
91
92 val = *(int *)rnode->sysctl_data;
93
94 node = *rnode;
95 node.sysctl_data = &val;
96
97 error = sysctl_lookup(SYSCTLFN_CALL(&node));
98 if (error != 0 || newp == NULL)
99 return error;
100
101 if (val == *(int *)rnode->sysctl_data)
102 return 0;
103
104 if (val == 1)
105 error = exec_add(linux32_execsw, __arraycount(linux32_execsw));
106 else if (val == 0)
107 error =
108 exec_remove(linux32_execsw, __arraycount(linux32_execsw));
109 else
110 error = EINVAL;
111
112 if (error)
113 return error;
114
115 *(int *)rnode->sysctl_data = val;
116
117 return 0;
118 }
119
120 static int
compat_linux32_modcmd(modcmd_t cmd,void * arg)121 compat_linux32_modcmd(modcmd_t cmd, void *arg)
122 {
123 int error;
124
125 switch (cmd) {
126 case MODULE_CMD_INIT:
127 error = exec_add(linux32_execsw, __arraycount(linux32_execsw));
128 return error;
129
130 case MODULE_CMD_FINI:
131 error =
132 exec_remove(linux32_execsw, __arraycount(linux32_execsw));
133 if (error)
134 return error;
135 linux32_sysctl_fini();
136 return 0;
137
138 default:
139 return ENOTTY;
140 }
141 }
142