212 lines
6.7 KiB
C
212 lines
6.7 KiB
C
/* $NetBSD: kern_sig_16.c,v 1.6 2020/05/23 23:42:41 ad Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to 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.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)kern_sig.c 8.14 (Berkeley) 5/14/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: kern_sig_16.c,v 1.6 2020/05/23 23:42:41 ad Exp $");
|
|
|
|
#if defined(_KERNEL_OPT)
|
|
#include "opt_compat_netbsd.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/rwlock.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/pool.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/syscallvar.h>
|
|
#include <sys/syscallargs.h>
|
|
#include <sys/kauth.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/compat_stub.h>
|
|
|
|
#include <uvm/uvm_object.h>
|
|
#include <uvm/uvm_prot.h>
|
|
#include <uvm/uvm_pager.h>
|
|
|
|
#include <compat/common/compat_mod.h>
|
|
|
|
extern krwlock_t exec_lock;
|
|
|
|
#if !defined(__amd64__) || defined(COMPAT_NETBSD32)
|
|
#define COMPAT_SIGCONTEXT
|
|
extern char sigcode[], esigcode[];
|
|
struct uvm_object *emul_netbsd_object;
|
|
#endif
|
|
|
|
static const struct syscall_package kern_sig_16_syscalls[] = {
|
|
#ifdef COMPAT_SIGCONTEXT
|
|
{ SYS_compat_16___sigaction14, 0,
|
|
(sy_call_t *)compat_16_sys___sigaction14 },
|
|
/* compat_16_sigreturn14 is in MD code! */
|
|
{ SYS_compat_16___sigreturn14, 0,
|
|
(sy_call_t *)compat_16_sys___sigreturn14 },
|
|
#endif
|
|
{ 0, 0, NULL }
|
|
};
|
|
|
|
int
|
|
compat_16_sys___sigaction14(struct lwp *l,
|
|
const struct compat_16_sys___sigaction14_args *uap, register_t *retval)
|
|
{
|
|
/* {
|
|
syscallarg(int) signum;
|
|
syscallarg(const struct sigaction *) nsa;
|
|
syscallarg(struct sigaction *) osa;
|
|
} */
|
|
struct sigaction nsa, osa;
|
|
int error;
|
|
|
|
if (SCARG(uap, nsa)) {
|
|
error = copyin(SCARG(uap, nsa), &nsa, sizeof(nsa));
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = sigaction1(l, SCARG(uap, signum),
|
|
SCARG(uap, nsa) ? &nsa : 0, SCARG(uap, osa) ? &osa : 0,
|
|
NULL, 0);
|
|
if (error)
|
|
return (error);
|
|
if (SCARG(uap, osa)) {
|
|
error = copyout(&osa, SCARG(uap, osa), sizeof(osa));
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kern_sig_16_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = syscall_establish(NULL, kern_sig_16_syscalls);
|
|
if (error)
|
|
return error;
|
|
#if defined(COMPAT_SIGCONTEXT)
|
|
KASSERT(emul_netbsd.e_sigobject == NULL);
|
|
rw_enter(&exec_lock, RW_WRITER);
|
|
emul_netbsd.e_sigcode = sigcode;
|
|
emul_netbsd.e_esigcode = esigcode;
|
|
emul_netbsd.e_sigobject = &emul_netbsd_object;
|
|
rw_exit(&exec_lock);
|
|
MODULE_HOOK_SET(sendsig_sigcontext_16_hook, sendsig_sigcontext);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
kern_sig_16_fini(void)
|
|
{
|
|
proc_t *p;
|
|
int error;
|
|
|
|
error = syscall_disestablish(NULL, kern_sig_16_syscalls);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Ensure sendsig_sigcontext() is not being used.
|
|
* module_lock prevents the flag being set on any
|
|
* further processes while we are here. See
|
|
* sigaction1() for the opposing half.
|
|
*/
|
|
mutex_enter(&proc_lock);
|
|
PROCLIST_FOREACH(p, &allproc) {
|
|
if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
|
|
break;
|
|
}
|
|
}
|
|
mutex_exit(&proc_lock);
|
|
if (p != NULL) {
|
|
syscall_establish(NULL, kern_sig_16_syscalls);
|
|
return EBUSY;
|
|
}
|
|
|
|
#if defined(COMPAT_SIGCONTEXT)
|
|
/*
|
|
* The sigobject may persist if still in use, but
|
|
* is reference counted so will die eventually.
|
|
*/
|
|
rw_enter(&exec_lock, RW_WRITER);
|
|
if (emul_netbsd_object != NULL) {
|
|
(*emul_netbsd_object->pgops->pgo_detach)(emul_netbsd_object);
|
|
}
|
|
emul_netbsd_object = NULL;
|
|
emul_netbsd.e_sigcode = NULL;
|
|
emul_netbsd.e_esigcode = NULL;
|
|
emul_netbsd.e_sigobject = NULL;
|
|
rw_exit(&exec_lock);
|
|
|
|
MODULE_HOOK_UNSET(sendsig_sigcontext_16_hook);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|