1 /* $NetBSD: linux_mod.c,v 1.7 2017/09/29 17:08:00 maxv 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 1.7 2017/09/29 17:08:00 maxv 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_futex.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 MODULE(MODULE_CLASS_EXEC, compat_linux, "compat,compat_ossaudio,sysv_ipc" 70 MD1 MD2 MD3); 71 72 static struct execsw linux_execsw[] = { 73 #if defined(EXEC_ELF32) && ELFSIZE == 32 74 { 75 .es_hdrsz = sizeof (Elf32_Ehdr), 76 .es_makecmds = exec_elf32_makecmds, 77 .u = { 78 .elf_probe_func = linux_elf32_probe, 79 }, 80 .es_emul = &emul_linux, 81 .es_prio = EXECSW_PRIO_ANY, 82 .es_arglen = LINUX_ELF_AUX_ARGSIZ, 83 .es_copyargs = linux_elf32_copyargs, 84 .es_setregs = NULL, 85 .es_coredump = coredump_elf32, 86 .es_setup_stack = linux_exec_setup_stack, 87 }, 88 #elif defined(EXEC_ELF64) 89 { 90 .es_hdrsz = sizeof (Elf64_Ehdr), 91 .es_makecmds = exec_elf64_makecmds, 92 .u = { 93 .elf_probe_func = linux_elf64_probe, 94 }, 95 .es_emul = &emul_linux, 96 .es_prio = EXECSW_PRIO_ANY, 97 .es_arglen = LINUX_ELF_AUX_ARGSIZ, 98 .es_copyargs = linux_elf64_copyargs, 99 .es_setregs = NULL, 100 .es_coredump = coredump_elf64, 101 .es_setup_stack = linux_exec_setup_stack, 102 }, 103 #endif 104 #ifdef EXEC_AOUT 105 { 106 .es_hdrsz = LINUX_AOUT_HDR_SIZE, 107 .es_makecmds = exec_linux_aout_makecmds, 108 .u = { 109 .elf_probe_func = NULL, 110 }, 111 .es_emul = &emul_linux, 112 .es_prio = EXECSW_PRIO_LAST, 113 .es_arglen = LINUX_AOUT_AUX_ARGSIZ, 114 .es_copyargs = linux_aout_copyargs, 115 .es_setregs = NULL, 116 .es_coredump = coredump_netbsd, 117 .es_setup_stack = linux_exec_setup_stack, 118 }, 119 #endif 120 }; 121 122 int linux_enabled = 0; 123 124 int 125 linux_sysctl_enable(SYSCTLFN_ARGS) 126 { 127 struct sysctlnode node; 128 int error, val; 129 130 val = *(int *)rnode->sysctl_data; 131 132 node = *rnode; 133 node.sysctl_data = &val; 134 135 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 136 if (error != 0 || newp == NULL) 137 return error; 138 139 if (val == 1) { 140 error = exec_add(linux_execsw, __arraycount(linux_execsw)); 141 } else if (val == 0) { 142 error = exec_remove(linux_execsw, __arraycount(linux_execsw)); 143 } else { 144 error = EINVAL; 145 } 146 if (error) 147 return error; 148 149 *(int *)rnode->sysctl_data = val; 150 151 return 0; 152 } 153 154 static int 155 compat_linux_modcmd(modcmd_t cmd, void *arg) 156 { 157 int error; 158 159 switch (cmd) { 160 case MODULE_CMD_INIT: 161 linux_enabled = 0; 162 linux_futex_init(); 163 linux_sysctl_init(); 164 return 0; 165 166 case MODULE_CMD_FINI: 167 error = exec_remove(linux_execsw, __arraycount(linux_execsw)); 168 if (error) 169 return error; 170 linux_sysctl_fini(); 171 linux_futex_fini(); 172 return 0; 173 174 default: 175 return ENOTTY; 176 } 177 } 178