1 /* $NetBSD: linux32_mod.c,v 1.11 2017/12/10 00:43:05 kre 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 1.11 2017/12/10 00:43:05 kre 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 MODULE(MODULE_CLASS_EXEC, compat_linux32, "compat_linux" MD1); 61 62 static struct execsw linux32_execsw[] = { 63 #if defined(EXEC_ELF32) 64 { 65 .es_hdrsz = sizeof (Elf32_Ehdr), 66 .es_makecmds = exec_elf32_makecmds, 67 .u = { 68 .elf_probe_func = linux32_elf32_probe, 69 }, 70 .es_emul = &emul_linux32, 71 .es_prio = EXECSW_PRIO_ANY, 72 .es_arglen = LINUX32_ELF_AUX_ARGSIZ, 73 .es_copyargs = linux32_elf32_copyargs, 74 .es_setregs = NULL, 75 .es_coredump = coredump_elf32, 76 .es_setup_stack = linux_exec_setup_stack, 77 }, 78 #endif 79 }; 80 81 int linux32_enabled = 1; 82 83 int 84 linux32_sysctl_enable(SYSCTLFN_ARGS) 85 { 86 struct sysctlnode node; 87 int error, val; 88 89 val = *(int *)rnode->sysctl_data; 90 91 node = *rnode; 92 node.sysctl_data = &val; 93 94 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 95 if (error != 0 || newp == NULL) 96 return error; 97 98 if (val == *(int *)rnode->sysctl_data) 99 return 0; 100 101 if (val == 1) 102 error = exec_add(linux32_execsw, __arraycount(linux32_execsw)); 103 else if (val == 0) 104 error = 105 exec_remove(linux32_execsw, __arraycount(linux32_execsw)); 106 else 107 error = EINVAL; 108 109 if (error) 110 return error; 111 112 *(int *)rnode->sysctl_data = val; 113 114 return 0; 115 } 116 117 static int 118 compat_linux32_modcmd(modcmd_t cmd, void *arg) 119 { 120 int error; 121 122 switch (cmd) { 123 case MODULE_CMD_INIT: 124 linux32_sysctl_init(); 125 error = exec_add(linux32_execsw, __arraycount(linux32_execsw)); 126 if (error != 0) 127 linux32_sysctl_fini(); 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