1 /* $NetBSD: linux32_mod.c,v 1.12 2019/01/27 02:08:40 pgoyette 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 1.12 2019/01/27 02:08:40 pgoyette 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 = linux_exec_setup_stack, 80 }, 81 #endif 82 }; 83 84 int linux32_enabled = 1; 85 86 int 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 121 compat_linux32_modcmd(modcmd_t cmd, void *arg) 122 { 123 int error; 124 125 switch (cmd) { 126 case MODULE_CMD_INIT: 127 linux32_sysctl_init(); 128 error = exec_add(linux32_execsw, __arraycount(linux32_execsw)); 129 if (error != 0) 130 linux32_sysctl_fini(); 131 return error; 132 133 case MODULE_CMD_FINI: 134 error = 135 exec_remove(linux32_execsw, __arraycount(linux32_execsw)); 136 if (error) 137 return error; 138 linux32_sysctl_fini(); 139 return 0; 140 141 default: 142 return ENOTTY; 143 } 144 } 145