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linux_mod.c revision 1.10.2.4 
      1 /*	$NetBSD: linux_mod.c,v 1.10.2.4 2019/01/24 02:05:16 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: linux_mod.c,v 1.10.2.4 2019/01/24 02:05:16 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_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 #define REQ1    "compat_ossaudio,sysv_ipc,compat_util"
     70 #define REQ2    ",compat_50,compat_43"
     71 
     72 MODULE(MODULE_CLASS_EXEC, compat_linux, REQ1 REQ2 MD1 MD2 MD3);
     73 
     74 static struct execsw linux_execsw[] = {
     75 #if defined(EXEC_ELF32) && ELFSIZE == 32
     76 	{
     77 		.es_hdrsz = sizeof (Elf32_Ehdr),
     78 		.es_makecmds = exec_elf32_makecmds,
     79 		.u = {
     80 			.elf_probe_func = linux_elf32_probe,
     81 		},
     82 		.es_emul = &emul_linux,
     83 		.es_prio = EXECSW_PRIO_ANY,
     84 		.es_arglen = LINUX_ELF_AUX_ARGSIZ,
     85 		.es_copyargs = linux_elf32_copyargs,
     86 		.es_setregs = NULL,
     87 		.es_coredump = coredump_elf32,
     88 		.es_setup_stack = linux_exec_setup_stack,
     89 	},
     90 #elif defined(EXEC_ELF64)
     91 	{
     92 		.es_hdrsz = sizeof (Elf64_Ehdr),
     93 		.es_makecmds = exec_elf64_makecmds,
     94 		.u = {
     95 			.elf_probe_func = linux_elf64_probe,
     96 		},
     97 		.es_emul = &emul_linux,
     98 		.es_prio = EXECSW_PRIO_ANY,
     99 		.es_arglen = LINUX_ELF_AUX_ARGSIZ,
    100 		.es_copyargs = linux_elf64_copyargs,
    101 		.es_setregs = NULL,
    102  		.es_coredump = coredump_elf64,
    103 		.es_setup_stack = linux_exec_setup_stack,
    104 	},
    105 #endif
    106 #ifdef EXEC_AOUT
    107 	{
    108 		.es_hdrsz = LINUX_AOUT_HDR_SIZE,
    109 		.es_makecmds = exec_linux_aout_makecmds,
    110 		.u = {
    111 			.elf_probe_func = NULL,
    112 		},
    113 		.es_emul = &emul_linux,
    114 		.es_prio = EXECSW_PRIO_LAST,
    115 		.es_arglen = LINUX_AOUT_AUX_ARGSIZ,
    116 		.es_copyargs = linux_aout_copyargs,
    117 		.es_setregs = NULL,
    118 		.es_coredump = coredump_netbsd,
    119 		.es_setup_stack = linux_exec_setup_stack,
    120 	},
    121 #endif
    122 };
    123 
    124 int linux_enabled = 1;
    125 
    126 int
    127 linux_sysctl_enable(SYSCTLFN_ARGS)
    128 {
    129 	struct sysctlnode node;
    130 	int error, val;
    131 
    132 	val = *(int *)rnode->sysctl_data;
    133 
    134 	node = *rnode;
    135 	node.sysctl_data = &val;
    136 
    137 	error = sysctl_lookup(SYSCTLFN_CALL(&node));
    138 	if (error != 0 || newp == NULL)
    139 		return error;
    140 
    141 	if (val == *(int *)rnode->sysctl_data)
    142 		return 0;
    143 
    144 	if (val == 1)
    145 		error = exec_add(linux_execsw, __arraycount(linux_execsw));
    146 	else if (val == 0)
    147 		error = exec_remove(linux_execsw, __arraycount(linux_execsw));
    148 	else
    149 		error = EINVAL;
    150 
    151 	if (error)
    152 		return error;
    153 
    154 	*(int *)rnode->sysctl_data = val;
    155 
    156 	return 0;
    157 }
    158 
    159 static int
    160 compat_linux_modcmd(modcmd_t cmd, void *arg)
    161 {
    162 	int error;
    163 
    164 	switch (cmd) {
    165 	case MODULE_CMD_INIT:
    166 		linux_futex_init();
    167 		linux_sysctl_init();
    168 		error = exec_add(linux_execsw, __arraycount(linux_execsw));
    169 		if (error != 0)
    170 			linux_sysctl_fini();
    171 		return error;
    172 
    173 	case MODULE_CMD_FINI:
    174 		error = exec_remove(linux_execsw, __arraycount(linux_execsw));
    175 		if (error)
    176 			return error;
    177 		linux_sysctl_fini();
    178 		linux_futex_fini();
    179 		return 0;
    180 
    181 	default:
    182 		return ENOTTY;
    183 	}
    184 }
    185