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linux32_mod.c revision 1.11.2.4 
      1 /*	$NetBSD: linux32_mod.c,v 1.11.2.4 2019/01/24 06:23:26 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 1.11.2.4 2019/01/24 06:23:26 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 #define	REQ1	"exec_elf32,compat_netbsd32,compat_linux"
     55 #define	REQ2	",sysv_ipc,compat_netbsd32_sysvipc,compat_sysv_50"
     56 #define	REQ3	",compat_netbsd32_50,compat_netbsd32_43"
     57 
     58 MODULE(MODULE_CLASS_EXEC, compat_linux32, REQ1 REQ2 REQ3);
     59 
     60 static struct execsw linux32_execsw[] = {
     61 #if defined(EXEC_ELF32)
     62 	{
     63 		.es_hdrsz = sizeof (Elf32_Ehdr),
     64 		.es_makecmds = exec_elf32_makecmds,
     65 		.u = {
     66 			.elf_probe_func = linux32_elf32_probe,
     67 		},
     68 		.es_emul = &emul_linux32,
     69 		.es_prio = EXECSW_PRIO_ANY,
     70 		.es_arglen = LINUX32_ELF_AUX_ARGSIZ,
     71 		.es_copyargs = linux32_elf32_copyargs,
     72 		.es_setregs = NULL,
     73 		.es_coredump = coredump_elf32,
     74 		.es_setup_stack = linux_exec_setup_stack,
     75 	},
     76 #endif
     77 };
     78 
     79 int linux32_enabled = 1;
     80 
     81 int
     82 linux32_sysctl_enable(SYSCTLFN_ARGS)
     83 {
     84 	struct sysctlnode node;
     85 	int error, val;
     86 
     87 	val = *(int *)rnode->sysctl_data;
     88 
     89 	node = *rnode;
     90 	node.sysctl_data = &val;
     91 
     92 	error = sysctl_lookup(SYSCTLFN_CALL(&node));
     93 	if (error != 0 || newp == NULL)
     94 		return error;
     95 
     96 	if (val == *(int *)rnode->sysctl_data)
     97 		return 0;
     98 
     99 	if (val == 1)
    100 		error = exec_add(linux32_execsw, __arraycount(linux32_execsw));
    101 	else if (val == 0)
    102 		error =
    103 		    exec_remove(linux32_execsw, __arraycount(linux32_execsw));
    104 	else
    105 		error = EINVAL;
    106 
    107 	if (error)
    108 		return error;
    109 
    110 	*(int *)rnode->sysctl_data = val;
    111 
    112 	return 0;
    113 }
    114 
    115 static int
    116 compat_linux32_modcmd(modcmd_t cmd, void *arg)
    117 {
    118 	int error;
    119 
    120 	switch (cmd) {
    121 	case MODULE_CMD_INIT:
    122 		linux32_sysctl_init();
    123 		error = exec_add(linux32_execsw, __arraycount(linux32_execsw));
    124 		if (error != 0)
    125 			linux32_sysctl_fini();
    126 		return error;
    127 
    128 	case MODULE_CMD_FINI:
    129 		error =
    130 		    exec_remove(linux32_execsw, __arraycount(linux32_execsw));
    131 		if (error)
    132 			return error;
    133 		linux32_sysctl_fini();
    134 		return 0;
    135 
    136 	default:
    137 		return ENOTTY;
    138 	}
    139 }
    140