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/* $NetBSD: kern_sig_43.c,v 1.38 2021/11/01 05:07:16 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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: kern_sig_43.c,v 1.38 2021/11/01 05:07:16 thorpej Exp $");
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/buf.h>
#include <sys/acct.h>
#include <sys/file.h>
#include <sys/kernel.h>
#include <sys/wait.h>
#include <sys/ktrace.h>
#include <sys/syslog.h>
#include <sys/stat.h>
#include <sys/core.h>
#include <sys/kauth.h>
#include <sys/syscall.h>
#include <sys/syscallvar.h>
#include <sys/syscallargs.h>
#include <sys/compat_stub.h>
#include <sys/cpu.h>
#include <compat/sys/signal.h>
#include <compat/common/compat_mod.h>
void compat_43_sigmask_to_sigset(const int *, sigset_t *);
void compat_43_sigset_to_sigmask(const sigset_t *, int *);
void compat_43_sigvec_to_sigaction(const struct sigvec *, struct sigaction *);
void compat_43_sigaction_to_sigvec(const struct sigaction *, struct sigvec *);
void compat_43_sigstack_to_sigaltstack(const struct sigstack *, stack_t *);
void compat_43_sigaltstack_to_sigstack(const stack_t *, struct sigstack *);
static struct syscall_package kern_sig_43_syscalls[] = {
{ SYS_compat_43_osigblock, 0, (sy_call_t *)compat_43_sys_sigblock },
{ SYS_compat_43_osigsetmask, 0, (sy_call_t *)compat_43_sys_sigsetmask },
{ SYS_compat_43_osigstack, 0, (sy_call_t *)compat_43_sys_sigstack },
{ SYS_compat_43_osigvec, 0, (sy_call_t *)compat_43_sys_sigvec },
{ SYS_compat_43_okillpg, 0, (sy_call_t *)compat_43_sys_killpg },
{ 0, 0, NULL }
};
void
compat_43_sigmask_to_sigset(const int *sm, sigset_t *ss)
{
memset(ss, 0, sizeof(*ss));
ss->__bits[0] = *sm;
ss->__bits[1] = 0;
ss->__bits[2] = 0;
ss->__bits[3] = 0;
}
void
compat_43_sigset_to_sigmask(const sigset_t *ss, int *sm)
{
*sm = ss->__bits[0];
}
void
compat_43_sigvec_to_sigaction(const struct sigvec *sv, struct sigaction *sa)
{
memset(sa, 0, sizeof(*sa));
sa->sa_handler = sv->sv_handler;
compat_43_sigmask_to_sigset(&sv->sv_mask, &sa->sa_mask);
sa->sa_flags = sv->sv_flags ^ SA_RESTART;
}
void
compat_43_sigaction_to_sigvec(const struct sigaction *sa, struct sigvec *sv)
{
memset(sv, 0, sizeof(*sv));
sv->sv_handler = sa->sa_handler;
compat_43_sigset_to_sigmask(&sa->sa_mask, &sv->sv_mask);
sv->sv_flags = sa->sa_flags ^ SA_RESTART;
}
void
compat_43_sigstack_to_sigaltstack(const struct sigstack *ss, stack_t *sa)
{
memset(sa, 0, sizeof(*sa));
sa->ss_sp = ss->ss_sp;
sa->ss_size = SIGSTKSZ; /* Use the recommended size */
sa->ss_flags = 0;
if (ss->ss_onstack)
sa->ss_flags |= SS_ONSTACK;
}
void
compat_43_sigaltstack_to_sigstack(const stack_t *sa, struct sigstack *ss)
{
memset(ss, 0, sizeof(*ss));
ss->ss_sp = sa->ss_sp;
if (sa->ss_flags & SS_ONSTACK)
ss->ss_onstack = 1;
else
ss->ss_onstack = 0;
}
int
compat_43_sys_sigblock(struct lwp *l, const struct compat_43_sys_sigblock_args *uap, register_t *retval)
{
/* {
syscallarg(int) mask;
} */
struct proc *p = l->l_proc;
int nsm, osm;
sigset_t nss, oss;
int error;
nsm = SCARG(uap, mask);
compat_43_sigmask_to_sigset(&nsm, &nss);
mutex_enter(p->p_lock);
error = sigprocmask1(l, SIG_BLOCK, &nss, &oss);
mutex_exit(p->p_lock);
if (error)
return (error);
compat_43_sigset_to_sigmask(&oss, &osm);
*retval = osm;
return (0);
}
int
compat_43_sys_sigsetmask(struct lwp *l, const struct compat_43_sys_sigsetmask_args *uap, register_t *retval)
{
/* {
syscallarg(int) mask;
} */
struct proc *p = l->l_proc;
int nsm, osm;
sigset_t nss, oss;
int error;
nsm = SCARG(uap, mask);
compat_43_sigmask_to_sigset(&nsm, &nss);
mutex_enter(p->p_lock);
error = sigprocmask1(l, SIG_SETMASK, &nss, &oss);
mutex_exit(p->p_lock);
if (error)
return (error);
compat_43_sigset_to_sigmask(&oss, &osm);
*retval = osm;
return (0);
}
/* ARGSUSED */
int
compat_43_sys_sigstack(struct lwp *l, const struct compat_43_sys_sigstack_args *uap, register_t *retval)
{
/* {
syscallarg(struct sigstack *) nss;
syscallarg(struct sigstack *) oss;
} */
struct sigstack nss, oss;
stack_t nsa, osa;
int error;
if (SCARG(uap, nss)) {
error = copyin(SCARG(uap, nss), &nss, sizeof(nss));
if (error)
return (error);
compat_43_sigstack_to_sigaltstack(&nss, &nsa);
}
error = sigaltstack1(l,
SCARG(uap, nss) ? &nsa : 0, SCARG(uap, oss) ? &osa : 0);
if (error)
return (error);
if (SCARG(uap, oss)) {
compat_43_sigaltstack_to_sigstack(&osa, &oss);
error = copyout(&oss, SCARG(uap, oss), sizeof(oss));
if (error)
return (error);
}
return (0);
}
/*
* Generalized interface signal handler, 4.3-compatible.
*/
/* ARGSUSED */
int
compat_43_sys_sigvec(struct lwp *l, const struct compat_43_sys_sigvec_args *uap, register_t *retval)
{
/* {
syscallarg(int) signum;
syscallarg(const struct sigvec *) nsv;
syscallarg(struct sigvec *) osv;
} */
struct sigvec nsv, osv;
struct sigaction nsa, osa;
int error;
if (SCARG(uap, nsv)) {
error = copyin(SCARG(uap, nsv), &nsv, sizeof(nsv));
if (error)
return (error);
compat_43_sigvec_to_sigaction(&nsv, &nsa);
}
error = sigaction1(l, SCARG(uap, signum),
SCARG(uap, nsv) ? &nsa : 0, SCARG(uap, osv) ? &osa : 0,
NULL, 0);
if (error)
return (error);
if (SCARG(uap, osv)) {
compat_43_sigaction_to_sigvec(&osa, &osv);
error = copyout(&osv, SCARG(uap, osv), sizeof(osv));
if (error)
return (error);
}
return (0);
}
/* ARGSUSED */
int
compat_43_sys_killpg(struct lwp *l, const struct compat_43_sys_killpg_args *uap, register_t *retval)
{
/* {
syscallarg(int) pgid;
syscallarg(int) signum;
} */
ksiginfo_t ksi;
int pgid = SCARG(uap, pgid);
pgid &= kern_sig_43_pgid_mask;
if ((u_int)SCARG(uap, signum) >= NSIG)
return (EINVAL);
memset(&ksi, 0, sizeof(ksi));
ksi.ksi_signo = SCARG(uap, signum);
ksi.ksi_code = SI_USER;
ksi.ksi_pid = l->l_proc->p_pid;
ksi.ksi_uid = kauth_cred_geteuid(l->l_cred);
return killpg1(l, &ksi, pgid, 0);
}
int
kern_sig_43_init(void)
{
return syscall_establish(NULL, kern_sig_43_syscalls);
}
int
kern_sig_43_fini(void)
{
return syscall_disestablish(NULL, kern_sig_43_syscalls);
}
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