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      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 
     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 = linux32_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 		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