659 lines
16 KiB
C
659 lines
16 KiB
C
/* $NetBSD: linux_signal.c,v 1.62 2008/04/28 20:23:44 martin Exp $ */
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/*-
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* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Frank van der Linden and Eric Haszlakiewicz.
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
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*/
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/*
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* Functions in multiarch:
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* linux_sys_signal : linux_sig_notalpha.c
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* linux_sys_siggetmask : linux_sig_notalpha.c
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* linux_sys_sigsetmask : linux_sig_notalpha.c
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* linux_sys_pause : linux_sig_notalpha.c
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* linux_sys_sigaction : linux_sigaction.c
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*
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*/
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/*
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* Unimplemented:
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* linux_sys_rt_sigtimedwait : sigsuspend w/timeout.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: linux_signal.c,v 1.62 2008/04/28 20:23:44 martin Exp $");
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#define COMPAT_LINUX 1
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/filedesc.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/kernel.h>
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#include <sys/signal.h>
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#include <sys/signalvar.h>
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#include <sys/malloc.h>
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#include <sys/syscallargs.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_exec.h> /* For emul_linux */
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#include <compat/linux/common/linux_machdep.h> /* For LINUX_NPTL */
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#include <compat/linux/common/linux_emuldata.h> /* for linux_emuldata */
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#include <compat/linux/common/linux_siginfo.h>
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#include <compat/linux/common/linux_sigevent.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_ipc.h>
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#include <compat/linux/common/linux_sem.h>
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#include <compat/linux/linux_syscallargs.h>
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/* Locally used defines (in bsd<->linux conversion functions): */
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#define linux_sigemptyset(s) memset((s), 0, sizeof(*(s)))
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#define linux_sigismember(s, n) ((s)->sig[((n) - 1) / LINUX__NSIG_BPW] \
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& (1 << ((n) - 1) % LINUX__NSIG_BPW))
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#define linux_sigaddset(s, n) ((s)->sig[((n) - 1) / LINUX__NSIG_BPW] \
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|= (1 << ((n) - 1) % LINUX__NSIG_BPW))
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#ifdef DEBUG_LINUX
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#define DPRINTF(a) uprintf a
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#else
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#define DPRINTF(a)
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#endif
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extern const int native_to_linux_signo[];
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extern const int linux_to_native_signo[];
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/*
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* Convert between Linux and BSD signal sets.
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*/
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#if LINUX__NSIG_WORDS > 1
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void
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linux_old_extra_to_native_sigset(sigset_t *bss, const linux_old_sigset_t *lss, const unsigned long *extra)
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{
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linux_sigset_t lsnew;
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/* convert old sigset to new sigset */
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linux_sigemptyset(&lsnew);
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lsnew.sig[0] = *lss;
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if (extra)
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memcpy(&lsnew.sig[1], extra,
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sizeof(linux_sigset_t) - sizeof(linux_old_sigset_t));
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linux_to_native_sigset(bss, &lsnew);
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}
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void
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native_to_linux_old_extra_sigset(linux_old_sigset_t *lss, unsigned long *extra, const sigset_t *bss)
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{
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linux_sigset_t lsnew;
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native_to_linux_sigset(&lsnew, bss);
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/* convert new sigset to old sigset */
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*lss = lsnew.sig[0];
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if (extra)
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memcpy(extra, &lsnew.sig[1],
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sizeof(linux_sigset_t) - sizeof(linux_old_sigset_t));
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}
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#endif /* LINUX__NSIG_WORDS > 1 */
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void
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linux_to_native_sigset(sigset_t *bss, const linux_sigset_t *lss)
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{
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int i, newsig;
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sigemptyset(bss);
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for (i = 1; i < LINUX__NSIG; i++) {
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if (linux_sigismember(lss, i)) {
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newsig = linux_to_native_signo[i];
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if (newsig)
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sigaddset(bss, newsig);
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}
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}
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}
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void
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native_to_linux_sigset(linux_sigset_t *lss, const sigset_t *bss)
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{
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int i, newsig;
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linux_sigemptyset(lss);
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for (i = 1; i < NSIG; i++) {
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if (sigismember(bss, i)) {
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newsig = native_to_linux_signo[i];
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if (newsig)
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linux_sigaddset(lss, newsig);
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}
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}
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}
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unsigned int
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native_to_linux_sigflags(const int bsf)
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{
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unsigned int lsf = 0;
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if ((bsf & SA_NOCLDSTOP) != 0)
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lsf |= LINUX_SA_NOCLDSTOP;
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if ((bsf & SA_NOCLDWAIT) != 0)
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lsf |= LINUX_SA_NOCLDWAIT;
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if ((bsf & SA_ONSTACK) != 0)
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lsf |= LINUX_SA_ONSTACK;
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if ((bsf & SA_RESTART) != 0)
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lsf |= LINUX_SA_RESTART;
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if ((bsf & SA_NODEFER) != 0)
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lsf |= LINUX_SA_NOMASK;
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if ((bsf & SA_RESETHAND) != 0)
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lsf |= LINUX_SA_ONESHOT;
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if ((bsf & SA_SIGINFO) != 0)
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lsf |= LINUX_SA_SIGINFO;
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return lsf;
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}
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int
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linux_to_native_sigflags(const unsigned long lsf)
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{
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int bsf = 0;
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if ((lsf & LINUX_SA_NOCLDSTOP) != 0)
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bsf |= SA_NOCLDSTOP;
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if ((lsf & LINUX_SA_NOCLDWAIT) != 0)
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bsf |= SA_NOCLDWAIT;
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if ((lsf & LINUX_SA_ONSTACK) != 0)
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bsf |= SA_ONSTACK;
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if ((lsf & LINUX_SA_RESTART) != 0)
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bsf |= SA_RESTART;
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if ((lsf & LINUX_SA_ONESHOT) != 0)
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bsf |= SA_RESETHAND;
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if ((lsf & LINUX_SA_NOMASK) != 0)
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bsf |= SA_NODEFER;
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if ((lsf & LINUX_SA_SIGINFO) != 0)
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bsf |= SA_SIGINFO;
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if ((lsf & ~LINUX_SA_ALLBITS) != 0) {
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DPRINTF(("linux_old_to_native_sigflags: "
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"%lx extra bits ignored\n", lsf));
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}
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return bsf;
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}
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/*
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* Convert between Linux and BSD sigaction structures.
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*/
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void
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linux_old_to_native_sigaction(struct sigaction *bsa, const struct linux_old_sigaction *lsa)
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{
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bsa->sa_handler = lsa->linux_sa_handler;
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linux_old_to_native_sigset(&bsa->sa_mask, &lsa->linux_sa_mask);
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bsa->sa_flags = linux_to_native_sigflags(lsa->linux_sa_flags);
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}
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void
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native_to_linux_old_sigaction(struct linux_old_sigaction *lsa, const struct sigaction *bsa)
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{
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lsa->linux_sa_handler = bsa->sa_handler;
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native_to_linux_old_sigset(&lsa->linux_sa_mask, &bsa->sa_mask);
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lsa->linux_sa_flags = native_to_linux_sigflags(bsa->sa_flags);
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#ifndef __alpha__
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lsa->linux_sa_restorer = NULL;
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#endif
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}
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/* ...and the new sigaction conversion funcs. */
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void
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linux_to_native_sigaction(struct sigaction *bsa, const struct linux_sigaction *lsa)
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{
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bsa->sa_handler = lsa->linux_sa_handler;
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linux_to_native_sigset(&bsa->sa_mask, &lsa->linux_sa_mask);
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bsa->sa_flags = linux_to_native_sigflags(lsa->linux_sa_flags);
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}
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void
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native_to_linux_sigaction(struct linux_sigaction *lsa, const struct sigaction *bsa)
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{
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lsa->linux_sa_handler = bsa->sa_handler;
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native_to_linux_sigset(&lsa->linux_sa_mask, &bsa->sa_mask);
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lsa->linux_sa_flags = native_to_linux_sigflags(bsa->sa_flags);
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#ifndef __alpha__
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lsa->linux_sa_restorer = NULL;
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#endif
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}
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/* ----------------------------------------------------------------------- */
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/*
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* The Linux sigaction() system call. Do the usual conversions,
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* and just call sigaction(). Some flags and values are silently
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* ignored (see above).
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*/
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int
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linux_sys_rt_sigaction(struct lwp *l, const struct linux_sys_rt_sigaction_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) signum;
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syscallarg(const struct linux_sigaction *) nsa;
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syscallarg(struct linux_sigaction *) osa;
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syscallarg(size_t) sigsetsize;
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} */
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struct linux_sigaction nlsa, olsa;
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struct sigaction nbsa, obsa;
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int error, sig;
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void *tramp = NULL;
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int vers = 0;
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#if defined __amd64__
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struct sigacts *ps = l->l_proc->p_sigacts;
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#endif
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if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
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return (EINVAL);
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if (SCARG(uap, nsa)) {
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error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
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if (error)
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return (error);
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linux_to_native_sigaction(&nbsa, &nlsa);
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}
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sig = SCARG(uap, signum);
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if (sig < 0 || sig >= LINUX__NSIG)
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return (EINVAL);
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if (sig > 0 && !linux_to_native_signo[sig]) {
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/* Pretend that we did something useful for unknown signals. */
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obsa.sa_handler = SIG_IGN;
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sigemptyset(&obsa.sa_mask);
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obsa.sa_flags = 0;
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} else {
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#if defined __amd64__
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if (nlsa.linux_sa_flags & LINUX_SA_RESTORER) {
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if ((tramp = nlsa.linux_sa_restorer) != NULL)
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vers = 2; /* XXX arch dependant */
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}
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#endif
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error = sigaction1(l, linux_to_native_signo[sig],
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SCARG(uap, nsa) ? &nbsa : NULL,
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SCARG(uap, osa) ? &obsa : NULL,
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tramp, vers);
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if (error)
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return (error);
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}
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if (SCARG(uap, osa)) {
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native_to_linux_sigaction(&olsa, &obsa);
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#if defined __amd64__
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if (ps->sa_sigdesc[sig].sd_vers != 0) {
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olsa.linux_sa_restorer = ps->sa_sigdesc[sig].sd_tramp;
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olsa.linux_sa_flags |= LINUX_SA_RESTORER;
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}
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#endif
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error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
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if (error)
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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_sigprocmask1(struct lwp *l, int how, const linux_old_sigset_t *set, linux_old_sigset_t *oset)
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{
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struct proc *p = l->l_proc;
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linux_old_sigset_t nlss, olss;
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sigset_t nbss, obss;
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int error;
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switch (how) {
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case LINUX_SIG_BLOCK:
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how = SIG_BLOCK;
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break;
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case LINUX_SIG_UNBLOCK:
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how = SIG_UNBLOCK;
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break;
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case LINUX_SIG_SETMASK:
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how = SIG_SETMASK;
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break;
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default:
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return (EINVAL);
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}
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if (set) {
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error = copyin(set, &nlss, sizeof(nlss));
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if (error)
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return (error);
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linux_old_to_native_sigset(&nbss, &nlss);
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}
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mutex_enter(p->p_lock);
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error = sigprocmask1(l, how,
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set ? &nbss : NULL, oset ? &obss : NULL);
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mutex_exit(p->p_lock);
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if (error)
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return (error);
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if (oset) {
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native_to_linux_old_sigset(&olss, &obss);
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error = copyout(&olss, oset, sizeof(olss));
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if (error)
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return (error);
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}
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return (error);
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}
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int
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linux_sys_rt_sigprocmask(struct lwp *l, const struct linux_sys_rt_sigprocmask_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) how;
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syscallarg(const linux_sigset_t *) set;
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syscallarg(linux_sigset_t *) oset;
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syscallarg(size_t) sigsetsize;
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} */
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linux_sigset_t nlss, olss, *oset;
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const linux_sigset_t *set;
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struct proc *p = l->l_proc;
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sigset_t nbss, obss;
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int error, how;
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if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
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return (EINVAL);
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switch (SCARG(uap, how)) {
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case LINUX_SIG_BLOCK:
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how = SIG_BLOCK;
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break;
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case LINUX_SIG_UNBLOCK:
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how = SIG_UNBLOCK;
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break;
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case LINUX_SIG_SETMASK:
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how = SIG_SETMASK;
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break;
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default:
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return (EINVAL);
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}
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set = SCARG(uap, set);
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oset = SCARG(uap, oset);
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if (set) {
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error = copyin(set, &nlss, sizeof(nlss));
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if (error)
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return (error);
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linux_to_native_sigset(&nbss, &nlss);
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}
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mutex_enter(p->p_lock);
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error = sigprocmask1(l, how,
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set ? &nbss : NULL, oset ? &obss : NULL);
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mutex_exit(p->p_lock);
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if (!error && oset) {
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native_to_linux_sigset(&olss, &obss);
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error = copyout(&olss, oset, sizeof(olss));
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}
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return (error);
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}
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int
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linux_sys_rt_sigpending(struct lwp *l, const struct linux_sys_rt_sigpending_args *uap, register_t *retval)
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{
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/* {
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syscallarg(linux_sigset_t *) set;
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syscallarg(size_t) sigsetsize;
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} */
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sigset_t bss;
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linux_sigset_t lss;
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if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
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return (EINVAL);
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sigpending1(l, &bss);
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native_to_linux_sigset(&lss, &bss);
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return copyout(&lss, SCARG(uap, set), sizeof(lss));
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}
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#ifndef __amd64__
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int
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linux_sys_sigpending(struct lwp *l, const struct linux_sys_sigpending_args *uap, register_t *retval)
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{
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/* {
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syscallarg(linux_old_sigset_t *) mask;
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} */
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sigset_t bss;
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linux_old_sigset_t lss;
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sigpending1(l, &bss);
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native_to_linux_old_sigset(&lss, &bss);
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return copyout(&lss, SCARG(uap, set), sizeof(lss));
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}
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int
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linux_sys_sigsuspend(struct lwp *l, const struct linux_sys_sigsuspend_args *uap, register_t *retval)
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{
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/* {
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syscallarg(void *) restart;
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syscallarg(int) oldmask;
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syscallarg(int) mask;
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} */
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linux_old_sigset_t lss;
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sigset_t bss;
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lss = SCARG(uap, mask);
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linux_old_to_native_sigset(&bss, &lss);
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return (sigsuspend1(l, &bss));
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}
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#endif /* __amd64__ */
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int
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linux_sys_rt_sigsuspend(struct lwp *l, const struct linux_sys_rt_sigsuspend_args *uap, register_t *retval)
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{
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/* {
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syscallarg(linux_sigset_t *) unewset;
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syscallarg(size_t) sigsetsize;
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} */
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linux_sigset_t lss;
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sigset_t bss;
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int error;
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if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
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return (EINVAL);
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error = copyin(SCARG(uap, unewset), &lss, sizeof(linux_sigset_t));
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if (error)
|
|
return (error);
|
|
|
|
linux_to_native_sigset(&bss, &lss);
|
|
|
|
return (sigsuspend1(l, &bss));
|
|
}
|
|
|
|
/*
|
|
* Once more: only a signal conversion is needed.
|
|
* Note: also used as sys_rt_queueinfo. The info field is ignored.
|
|
*/
|
|
int
|
|
linux_sys_rt_queueinfo(struct lwp *l, const struct linux_sys_rt_queueinfo_args *uap, register_t *retval)
|
|
{
|
|
/* XXX XAX This isn't this really int, int, siginfo_t *, is it? */
|
|
#if 0
|
|
struct linux_sys_rt_queueinfo_args /* {
|
|
syscallarg(int) pid;
|
|
syscallarg(int) signum;
|
|
syscallarg(siginfo_t *) uinfo;
|
|
} */ *uap = v;
|
|
#endif
|
|
|
|
/* XXX To really implement this we need to */
|
|
/* XXX keep a list of queued signals somewhere. */
|
|
return (linux_sys_kill(l, (const void *)uap, retval));
|
|
}
|
|
|
|
int
|
|
linux_sys_kill(struct lwp *l, const struct linux_sys_kill_args *uap, register_t *retval)
|
|
{
|
|
/* {
|
|
syscallarg(int) pid;
|
|
syscallarg(int) signum;
|
|
} */
|
|
|
|
struct sys_kill_args ka;
|
|
int sig;
|
|
|
|
SCARG(&ka, pid) = SCARG(uap, pid);
|
|
sig = SCARG(uap, signum);
|
|
if (sig < 0 || sig >= LINUX__NSIG)
|
|
return (EINVAL);
|
|
SCARG(&ka, signum) = linux_to_native_signo[sig];
|
|
return sys_kill(l, &ka, retval);
|
|
}
|
|
|
|
#ifdef LINUX_SS_ONSTACK
|
|
static void linux_to_native_sigaltstack(struct sigaltstack *,
|
|
const struct linux_sigaltstack *);
|
|
|
|
static void
|
|
linux_to_native_sigaltstack(struct sigaltstack *bss, const struct linux_sigaltstack *lss)
|
|
{
|
|
bss->ss_sp = lss->ss_sp;
|
|
bss->ss_size = lss->ss_size;
|
|
if (lss->ss_flags & LINUX_SS_ONSTACK)
|
|
bss->ss_flags = SS_ONSTACK;
|
|
else if (lss->ss_flags & LINUX_SS_DISABLE)
|
|
bss->ss_flags = SS_DISABLE;
|
|
else
|
|
bss->ss_flags = 0;
|
|
}
|
|
|
|
void
|
|
native_to_linux_sigaltstack(struct linux_sigaltstack *lss, const struct sigaltstack *bss)
|
|
{
|
|
lss->ss_sp = bss->ss_sp;
|
|
lss->ss_size = bss->ss_size;
|
|
if (bss->ss_flags & SS_ONSTACK)
|
|
lss->ss_flags = LINUX_SS_ONSTACK;
|
|
else if (bss->ss_flags & SS_DISABLE)
|
|
lss->ss_flags = LINUX_SS_DISABLE;
|
|
else
|
|
lss->ss_flags = 0;
|
|
}
|
|
|
|
int
|
|
linux_sys_sigaltstack(struct lwp *l, const struct linux_sys_sigaltstack_args *uap, register_t *retval)
|
|
{
|
|
/* {
|
|
syscallarg(const struct linux_sigaltstack *) ss;
|
|
syscallarg(struct linux_sigaltstack *) oss;
|
|
} */
|
|
struct linux_sigaltstack ss;
|
|
struct sigaltstack nss;
|
|
struct proc *p = l->l_proc;
|
|
int error = 0;
|
|
|
|
if (SCARG(uap, oss)) {
|
|
native_to_linux_sigaltstack(&ss, &l->l_sigstk);
|
|
if ((error = copyout(&ss, SCARG(uap, oss), sizeof(ss))) != 0)
|
|
return error;
|
|
}
|
|
|
|
if (SCARG(uap, ss) != NULL) {
|
|
if ((error = copyin(SCARG(uap, ss), &ss, sizeof(ss))) != 0)
|
|
return error;
|
|
linux_to_native_sigaltstack(&nss, &ss);
|
|
|
|
mutex_enter(p->p_lock);
|
|
|
|
if (nss.ss_flags & ~SS_ALLBITS)
|
|
error = EINVAL;
|
|
else if (nss.ss_flags & SS_DISABLE) {
|
|
if (l->l_sigstk.ss_flags & SS_ONSTACK)
|
|
error = EINVAL;
|
|
} else if (nss.ss_size < LINUX_MINSIGSTKSZ)
|
|
error = ENOMEM;
|
|
|
|
if (error == 0)
|
|
l->l_sigstk = nss;
|
|
|
|
mutex_exit(p->p_lock);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
#endif /* LINUX_SS_ONSTACK */
|
|
|
|
#ifdef LINUX_NPTL
|
|
int
|
|
linux_sys_tkill(struct lwp *l, const struct linux_sys_tkill_args *uap, register_t *retval)
|
|
{
|
|
/* {
|
|
syscallarg(int) tid;
|
|
syscallarg(int) sig;
|
|
} */
|
|
struct linux_sys_kill_args cup;
|
|
|
|
/* We use the PID as the TID ... */
|
|
SCARG(&cup, pid) = SCARG(uap, tid);
|
|
SCARG(&cup, signum) = SCARG(uap, sig);
|
|
|
|
return linux_sys_kill(l, &cup, retval);
|
|
}
|
|
|
|
int
|
|
linux_sys_tgkill(struct lwp *l, const struct linux_sys_tgkill_args *uap, register_t *retval)
|
|
{
|
|
/* {
|
|
syscallarg(int) tgid;
|
|
syscallarg(int) tid;
|
|
syscallarg(int) sig;
|
|
} */
|
|
struct linux_sys_kill_args cup;
|
|
struct linux_emuldata *led;
|
|
struct proc *p;
|
|
|
|
SCARG(&cup, pid) = SCARG(uap, tid);
|
|
SCARG(&cup, signum) = SCARG(uap, sig);
|
|
|
|
if (SCARG(uap, tgid) == -1)
|
|
return linux_sys_kill(l, &cup, retval);
|
|
|
|
/* We use the PID as the TID, but make sure the group ID is right */
|
|
/* XXX racy */
|
|
mutex_enter(proc_lock);
|
|
if ((p = p_find(SCARG(uap, tid), PFIND_LOCKED)) == NULL ||
|
|
p->p_emul != &emul_linux) {
|
|
mutex_exit(proc_lock);
|
|
return ESRCH;
|
|
}
|
|
led = p->p_emuldata;
|
|
if (led->s->group_pid != SCARG(uap, tgid)) {
|
|
mutex_exit(proc_lock);
|
|
return ESRCH;
|
|
}
|
|
mutex_exit(proc_lock);
|
|
|
|
return linux_sys_kill(l, &cup, retval);
|
|
}
|
|
#endif /* LINUX_NPTL */
|