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 63MODULE(MODULE_CLASS_EXEC, compat_linux32, REQ1 REQ2 MD1); 64 65static 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 84int linux32_enabled = 1; 85 86int 87linux32_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 120static int 121compat_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