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linux_mod.c revision 1.2.12.2 
      1 /*	$NetBSD: linux_mod.c,v 1.2.12.2 2017/12/03 11:36:55 jdolecek 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 1.2.12.2 2017/12/03 11:36:55 jdolecek 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 = 1;
    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