2116e6ab2f
Linux and FreeBSD signal numbers. Also, check signal numbers passed in from application programs for validity. Without these checks, it is trivial to panic the system from a Linux program.
319 lines
8.5 KiB
C
319 lines
8.5 KiB
C
/*-
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* Copyright (c) 1994-1995 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: linux_signal.c,v 1.12 1998/08/15 22:29:43 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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#include <i386/linux/linux_util.h>
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static sigset_t
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linux_to_bsd_sigset(linux_sigset_t mask) {
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int b, l;
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sigset_t new = 0;
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for (l = 1; l < LINUX_NSIG; l++) {
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if (mask & (1 << (l - 1))) {
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if ((b = linux_to_bsd_signal[l]))
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new |= (1 << (b - 1));
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}
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}
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return new;
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}
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static linux_sigset_t
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bsd_to_linux_sigset(sigset_t mask) {
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int b, l;
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sigset_t new = 0;
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for (b = 1; b < NSIG; b++) {
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if (mask & (1 << (b - 1))) {
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if ((l = bsd_to_linux_signal[b]))
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new |= (1 << (l - 1));
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}
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}
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return new;
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}
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static void
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linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
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{
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bsa->sa_mask = linux_to_bsd_sigset(lsa->sa_mask);
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bsa->sa_handler = lsa->sa_handler;
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bsa->sa_flags = 0;
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if (lsa->sa_flags & LINUX_SA_NOCLDSTOP)
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bsa->sa_flags |= SA_NOCLDSTOP;
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if (lsa->sa_flags & LINUX_SA_ONSTACK)
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bsa->sa_flags |= SA_ONSTACK;
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if (lsa->sa_flags & LINUX_SA_RESTART)
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bsa->sa_flags |= SA_RESTART;
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if (lsa->sa_flags & LINUX_SA_ONESHOT)
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bsa->sa_flags |= SA_RESETHAND;
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if (lsa->sa_flags & LINUX_SA_NOMASK)
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bsa->sa_flags |= SA_NODEFER;
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}
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static void
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bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
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{
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lsa->sa_handler = bsa->sa_handler;
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lsa->sa_restorer = NULL; /* unsupported */
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lsa->sa_mask = bsd_to_linux_sigset(bsa->sa_mask);
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lsa->sa_flags = 0;
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if (bsa->sa_flags & SA_NOCLDSTOP)
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lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
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if (bsa->sa_flags & SA_ONSTACK)
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lsa->sa_flags |= LINUX_SA_ONSTACK;
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if (bsa->sa_flags & SA_RESTART)
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lsa->sa_flags |= LINUX_SA_RESTART;
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if (bsa->sa_flags & SA_RESETHAND)
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lsa->sa_flags |= LINUX_SA_ONESHOT;
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if (bsa->sa_flags & SA_NODEFER)
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lsa->sa_flags |= LINUX_SA_NOMASK;
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}
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int
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linux_sigaction(struct proc *p, struct linux_sigaction_args *args)
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{
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linux_sigaction_t linux_sa;
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struct sigaction *nsa = NULL, *osa = NULL, bsd_sa;
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struct sigaction_args sa;
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int error;
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caddr_t sg = stackgap_init();
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#ifdef DEBUG
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printf("Linux-emul(%ld): sigaction(%d, %p, %p)\n",
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(long)p->p_pid, args->sig, (void *)args->nsa, (void *)args->osa);
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#endif
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if (args->sig <= 0 || args->sig >= LINUX_NSIG)
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return EINVAL;
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if (args->osa)
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osa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
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if (args->nsa) {
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nsa = (struct sigaction *)stackgap_alloc(&sg, sizeof(struct sigaction));
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if (error = copyin(args->nsa, &linux_sa, sizeof(linux_sigaction_t)))
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return error;
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linux_to_bsd_sigaction(&linux_sa, &bsd_sa);
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if (error = copyout(&bsd_sa, nsa, sizeof(struct sigaction)))
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return error;
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}
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sa.signum = linux_to_bsd_signal[args->sig];
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sa.nsa = nsa;
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sa.osa = osa;
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if ((error = sigaction(p, &sa)))
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return error;
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if (args->osa) {
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if (error = copyin(osa, &bsd_sa, sizeof(struct sigaction)))
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return error;
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bsd_to_linux_sigaction(&bsd_sa, &linux_sa);
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if (error = copyout(&linux_sa, args->osa, sizeof(linux_sigaction_t)))
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return error;
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}
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return 0;
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}
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int
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linux_signal(struct proc *p, struct linux_signal_args *args)
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{
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caddr_t sg;
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struct sigaction_args sa_args;
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struct sigaction *osa, *nsa, tmpsa;
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int error;
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#ifdef DEBUG
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printf("Linux-emul(%ld): signal(%d, %p)\n",
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(long)p->p_pid, args->sig, (void *)args->handler);
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#endif
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if (args->sig <= 0 || args->sig >= LINUX_NSIG)
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return EINVAL;
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sg = stackgap_init();
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nsa = stackgap_alloc(&sg, sizeof *nsa);
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osa = stackgap_alloc(&sg, sizeof *osa);
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tmpsa.sa_handler = args->handler;
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tmpsa.sa_mask = (sigset_t) 0;
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tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
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if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
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return error;
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sa_args.signum = linux_to_bsd_signal[args->sig];
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sa_args.osa = osa;
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sa_args.nsa = nsa;
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if ((error = sigaction(p, &sa_args)))
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return error;
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if ((error = copyin(osa, &tmpsa, sizeof *osa)))
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return error;
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p->p_retval[0] = (int)tmpsa.sa_handler;
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return 0;
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}
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int
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linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
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{
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int error, s;
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sigset_t mask;
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sigset_t omask;
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#ifdef DEBUG
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printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
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#endif
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p->p_retval[0] = 0;
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if (args->omask != NULL) {
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omask = bsd_to_linux_sigset(p->p_sigmask);
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if (error = copyout(&omask, args->omask, sizeof(sigset_t)))
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return error;
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}
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if (!(args->mask))
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return 0;
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if (error = copyin(args->mask, &mask, sizeof(linux_sigset_t)))
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return error;
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mask = linux_to_bsd_sigset(mask);
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s = splhigh();
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switch (args->how) {
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case LINUX_SIG_BLOCK:
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p->p_sigmask |= (mask & ~sigcantmask);
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break;
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case LINUX_SIG_UNBLOCK:
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p->p_sigmask &= ~mask;
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break;
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case LINUX_SIG_SETMASK:
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p->p_sigmask = (mask & ~sigcantmask);
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break;
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default:
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error = EINVAL;
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break;
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}
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splx(s);
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return error;
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}
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int
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linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
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{
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#ifdef DEBUG
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printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
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#endif
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p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
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return 0;
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}
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int
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linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
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{
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int s;
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sigset_t mask;
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#ifdef DEBUG
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printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
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(long)p->p_pid, (unsigned long)args->mask);
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#endif
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p->p_retval[0] = bsd_to_linux_sigset(p->p_sigmask);
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mask = linux_to_bsd_sigset(args->mask);
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s = splhigh();
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p->p_sigmask = mask & ~sigcantmask;
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splx(s);
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return 0;
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}
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int
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linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
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{
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linux_sigset_t linux_sig;
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#ifdef DEBUG
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printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
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#endif
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linux_sig = bsd_to_linux_sigset(p->p_siglist & p->p_sigmask);
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return copyout(&linux_sig, args->mask, sizeof(linux_sig));
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}
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/*
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* Linux has two extra args, restart and oldmask. We dont use these,
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* but it seems that "restart" is actually a context pointer that
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* enables the signal to happen with a different register set.
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*/
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int
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linux_sigsuspend(struct proc *p, struct linux_sigsuspend_args *args)
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{
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struct sigsuspend_args tmp;
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#ifdef DEBUG
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printf("Linux-emul(%ld): sigsuspend(%08lx)\n",
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(long)p->p_pid, (unsigned long)args->mask);
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#endif
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tmp.mask = linux_to_bsd_sigset(args->mask);
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return sigsuspend(p, &tmp);
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}
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int
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linux_pause(struct proc *p, struct linux_pause_args *args)
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{
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struct sigsuspend_args tmp;
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#ifdef DEBUG
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printf("Linux-emul(%d): pause()\n", p->p_pid);
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#endif
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tmp.mask = p->p_sigmask;
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return sigsuspend(p, &tmp);
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}
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int
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linux_kill(struct proc *p, struct linux_kill_args *args)
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{
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struct kill_args /* {
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int pid;
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int signum;
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} */ tmp;
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#ifdef DEBUG
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printf("Linux-emul(%d): kill(%d, %d)\n",
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p->p_pid, args->pid, args->signum);
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#endif
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if (args->signum <= 0 || args->signum >= LINUX_NSIG)
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return EINVAL;
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tmp.pid = args->pid;
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tmp.signum = linux_to_bsd_signal[args->signum];
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return kill(p, &tmp);
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}
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