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/* $NetBSD: linux_mod.c,v 1.14 2020/04/26 18:53:33 thorpej Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation
* by Andrew Doran.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_mod.c,v 1.14 2020/04/26 18:53:33 thorpej Exp $");
#ifdef _KERNEL_OPT
#include "opt_execfmt.h"
#endif
#ifndef ELFSIZE
#define ELFSIZE ARCH_ELFSIZE
#endif
#include <sys/param.h>
#include <sys/module.h>
#include <sys/exec.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <compat/linux/common/linux_sysctl.h>
#include <compat/linux/common/linux_exec.h>
#if defined(EXEC_ELF32) && ELFSIZE == 32
# define MD1 ",exec_elf32"
#else
# define MD1 ""
#endif
#if defined(EXEC_ELF64)
# define MD2 ",exec_elf64"
#else
# define MD2 ""
#endif
#if defined(EXEC_AOUT)
# define MD3 ",exec_aout"
#else
# define MD3 ""
#endif
#define REQ1 "compat_ossaudio,sysv_ipc,compat_util"
#define REQ2 ",compat_50,compat_43"
MODULE(MODULE_CLASS_EXEC, compat_linux, REQ1 REQ2 MD1 MD2 MD3);
static struct execsw linux_execsw[] = {
#if defined(EXEC_ELF32) && ELFSIZE == 32
{
.es_hdrsz = sizeof (Elf32_Ehdr),
.es_makecmds = exec_elf32_makecmds,
.u = {
.elf_probe_func = linux_elf32_probe,
},
.es_emul = &emul_linux,
.es_prio = EXECSW_PRIO_ANY,
.es_arglen = LINUX_ELF_AUX_ARGSIZ,
.es_copyargs = linux_elf32_copyargs,
.es_setregs = NULL,
.es_coredump = coredump_elf32,
.es_setup_stack = linux_exec_setup_stack,
},
#elif defined(EXEC_ELF64)
{
.es_hdrsz = sizeof (Elf64_Ehdr),
.es_makecmds = exec_elf64_makecmds,
.u = {
.elf_probe_func = linux_elf64_probe,
},
.es_emul = &emul_linux,
.es_prio = EXECSW_PRIO_ANY,
.es_arglen = LINUX_ELF_AUX_ARGSIZ,
.es_copyargs = linux_elf64_copyargs,
.es_setregs = NULL,
.es_coredump = coredump_elf64,
.es_setup_stack = linux_exec_setup_stack,
},
#endif
#ifdef EXEC_AOUT
{
.es_hdrsz = LINUX_AOUT_HDR_SIZE,
.es_makecmds = exec_linux_aout_makecmds,
.u = {
.elf_probe_func = NULL,
},
.es_emul = &emul_linux,
.es_prio = EXECSW_PRIO_LAST,
.es_arglen = LINUX_AOUT_AUX_ARGSIZ,
.es_copyargs = linux_aout_copyargs,
.es_setregs = NULL,
.es_coredump = coredump_netbsd,
.es_setup_stack = linux_exec_setup_stack,
},
#endif
};
int linux_enabled = 1;
int
linux_sysctl_enable(SYSCTLFN_ARGS)
{
struct sysctlnode node;
int error, val;
val = *(int *)rnode->sysctl_data;
node = *rnode;
node.sysctl_data = &val;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error != 0 || newp == NULL)
return error;
if (val == *(int *)rnode->sysctl_data)
return 0;
if (val == 1)
error = exec_add(linux_execsw, __arraycount(linux_execsw));
else if (val == 0)
error = exec_remove(linux_execsw, __arraycount(linux_execsw));
else
error = EINVAL;
if (error)
return error;
*(int *)rnode->sysctl_data = val;
return 0;
}
static int
compat_linux_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = exec_add(linux_execsw, __arraycount(linux_execsw));
return error;
case MODULE_CMD_FINI:
error = exec_remove(linux_execsw, __arraycount(linux_execsw));
if (error)
return error;
linux_sysctl_fini();
return 0;
default:
return ENOTTY;
}
}
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