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HardenedBSD/sys/compat/linux/linux_signal.c

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/*-
* Copyright (c) 1994-1995 Søren Schmidt
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: linux_signal.c,v 1.4 1996/03/02 19:37:58 peter Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <i386/linux/linux.h>
#include <i386/linux/linux_proto.h>
#include <i386/linux/linux_util.h>
static sigset_t
linux_to_bsd_sigset(linux_sigset_t mask) {
int b, l;
sigset_t new = 0;
for (l = 1; l <= LINUX_NSIG; l++) {
if (mask & (1 << (l - 1))) {
if ((b = linux_to_bsd_signal[l]))
new |= (1 << (b - 1));
}
}
return new;
}
static linux_sigset_t
bsd_to_linux_sigset(sigset_t mask) {
int b, l;
sigset_t new = 0;
for (b = 1; b <= NSIG; b++) {
if (mask & (1 << (b - 1))) {
if ((l = bsd_to_linux_signal[b]))
new |= (1 << (l - 1));
}
}
return new;
}
static void
linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
{
bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask);
bsa->sa_handler = lsa->sa_handler;
bsa->sa_flags = 0;
if (lsa->sa_flags & LINUX_SA_NOCLDSTOP)
bsa->sa_flags |= SA_NOCLDSTOP;
if (lsa->sa_flags & LINUX_SA_ONSTACK)
bsa->sa_flags |= SA_ONSTACK;
if (lsa->sa_flags & LINUX_SA_RESTART)
bsa->sa_flags |= SA_RESTART;
if (lsa->sa_flags & LINUX_SA_ONESHOT)
bsa->sa_flags |= SA_RESETHAND;
if (lsa->sa_flags & LINUX_SA_NOMASK)
bsa->sa_flags |= SA_NODEFER;
}
static void
bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
{
lsa->sa_handler = bsa->sa_handler;
lsa->sa_restorer = NULL; /* unsupported */
lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask);
lsa->sa_flags = 0;
if (bsa->sa_flags & SA_NOCLDSTOP)
lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
if (bsa->sa_flags & SA_ONSTACK)
lsa->sa_flags |= LINUX_SA_ONSTACK;
if (bsa->sa_flags & SA_RESTART)
lsa->sa_flags |= LINUX_SA_RESTART;
if (bsa->sa_flags & SA_RESETHAND)
lsa->sa_flags |= LINUX_SA_ONESHOT;
if (bsa->sa_flags & SA_NODEFER)
lsa->sa_flags |= LINUX_SA_NOMASK;
}
int
linux_sigaction(struct proc *p, struct linux_sigaction_args *args, int *retval)
{
linux_sigaction_t linux_sa;
struct sigaction *nsa = NULL, *osa = NULL, bsd_sa;
struct sigaction_args sa;
int error;
caddr_t sg = stackgap_init();
#ifdef DEBUG
printf("Linux-emul(%d): sigaction(%d, %08x, %08x)\n", p->p_pid, args->sig,
args->nsa, args->osa);
#endif
if (args->osa)
osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
if (args->nsa) {
nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
return error;
linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
return error;
}
sa.signum = linux_to_bsd_signal[args->sig];
sa.nsa = nsa;
sa.osa = osa;
if ((error = sigaction(p, &sa, retval)))
return error;
if (args->osa) {
if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
return error;
bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
return error;
}
return 0;
}
int
linux_signal(struct proc *p, struct linux_signal_args *args, int *retval)
{
caddr_t sg;
struct sigaction_args sa_args;
struct sigaction *osa, *nsa, tmpsa;
int error;
#ifdef DEBUG
printf("Linux-emul(%d): signal(%d, %08x)\n", p->p_pid,
args->sig, args->handler);
#endif
sg = stackgap_init();
nsa = stackgap_alloc(&sg, sizeof *nsa);
osa = stackgap_alloc(&sg, sizeof *osa);
tmpsa.sa_handler = args->handler;
tmpsa.sa_mask = (sigset_t) 0;
tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
return error;
sa_args.signum = linux_to_bsd_signal[args->sig];
sa_args.osa = osa;
sa_args.nsa = nsa;
if ((error = sigaction(p, &sa_args, retval)))
return error;
if ((error = copyin(osa, &tmpsa, sizeof *osa)))
return error;
*retval = (int)tmpsa.sa_handler;
return 0;
}
int
linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args,
int *retval)
{
int error, s;
sigset_t mask;
sigset_t omask;
#ifdef DEBUG
printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
#endif
*retval = 0;
if (args->omask != NULL) {
omask = bsd_to_linux_sigset(p->p_sigmask);
if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
return error;
}
if (!(args->mask))
return 0;
if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
return error;
mask = linux_to_bsd_sigset(mask);
s = splhigh();
switch (args->how) {
case LINUX_SIG_BLOCK:
p->p_sigmask |= (mask & ~sigcantmask);
break;
case LINUX_SIG_UNBLOCK:
p->p_sigmask &= ~mask;
break;
case LINUX_SIG_SETMASK:
p->p_sigmask = (mask & ~sigcantmask);
break;
default:
error = EINVAL;
break;
}
splx(s);
return error;
}
int
linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args, int *retval)
{
#ifdef DEBUG
printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
#endif
*retval = bsd_to_linux_sigset(p->p_sigmask);
return 0;
}
int
linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args,int *retval)
{
int s;
sigset_t mask;
#ifdef DEBUG
printf("Linux-emul(%d): sigsetmask(%08x)\n", p->p_pid, args->mask);
#endif
*retval = bsd_to_linux_sigset(p->p_sigmask);
mask = linux_to_bsd_sigset(args->mask);
s = splhigh();
p->p_sigmask = mask & ~sigcantmask;
splx(s);
return 0;
}
int
linux_sigpending(struct proc *p, struct linux_sigpending_args *args,int *retval)
{
linux_sigset_t linux_sig;
#ifdef DEBUG
printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
#endif
linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
return copyout(&linux_sig, args->mask, sizeof(linux_sig));
}
int
linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args,int *retval)
{
struct sigsuspend_args tmp;
int error;
#ifdef DEBUG
printf("Linux-emul(%d): sigsuspend(%08x)\n", p->p_pid, args->mask);
#endif
tmp.mask = linux_to_bsd_sigset(args->mask);
return sigsuspend(p, &tmp , retval);
}
int
linux_pause(struct proc *p, struct linux_pause_args *args,int *retval)
{
struct sigsuspend_args tmp;
int error;
#ifdef DEBUG
printf("Linux-emul(%d): pause()\n", p->p_pid);
#endif
tmp.mask = p->p_sigmask;
return sigsuspend(p, &tmp , retval);
}
int
linux_kill(struct proc *p, struct linux_kill_args *args, int *retval)
{
struct kill_args /* {
int pid;
int signum;
} */ tmp;
#ifdef DEBUG
printf("Linux-emul(%d): kill(%d, %d)\n",
p->p_pid, args->pid, args->signum);
#endif
tmp.pid = args->pid;
tmp.signum = linux_to_bsd_signal[args->signum];
return kill(p, &tmp, retval);
}
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