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 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 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