1 files changed, 656 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_signal.c b/sys/compat/linux/linux_signal.c
new file mode 100644
index 0000000..1c778f9
--- /dev/null
+++ b/sys/compat/linux/linux_signal.c
@@ -0,0 +1,656 @@
+/*-
+ * 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 without 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sx.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+#include <sys/syscallsubr.h>
+#include <sys/sysproto.h>
+
+#include <security/audit/audit.h>
+
+#include "opt_compat.h"
+
+#ifdef COMPAT_LINUX32
+#include <machine/../linux32/linux.h>
+#include <machine/../linux32/linux32_proto.h>
+#else
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#endif
+#include <compat/linux/linux_signal.h>
+#include <compat/linux/linux_util.h>
+#include <compat/linux/linux_emul.h>
+
+void
+linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
+{
+	int b, l;
+
+	SIGEMPTYSET(*bss);
+	bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
+	bss->__bits[1] = lss->__bits[1];
+	for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
+		if (LINUX_SIGISMEMBER(*lss, l)) {
+			b = linux_to_bsd_signal[_SIG_IDX(l)];
+			if (b)
+				SIGADDSET(*bss, b);
+		}
+	}
+}
+
+void
+bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
+{
+	int b, l;
+
+	LINUX_SIGEMPTYSET(*lss);
+	lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
+	lss->__bits[1] = bss->__bits[1];
+	for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
+		if (SIGISMEMBER(*bss, b)) {
+			l = bsd_to_linux_signal[_SIG_IDX(b)];
+			if (l)
+				LINUX_SIGADDSET(*lss, l);
+		}
+	}
+}
+
+static void
+linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
+{
+
+	linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
+	bsa->sa_handler = PTRIN(lsa->lsa_handler);
+	bsa->sa_flags = 0;
+	if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
+		bsa->sa_flags |= SA_NOCLDSTOP;
+	if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
+		bsa->sa_flags |= SA_NOCLDWAIT;
+	if (lsa->lsa_flags & LINUX_SA_SIGINFO)
+		bsa->sa_flags |= SA_SIGINFO;
+	if (lsa->lsa_flags & LINUX_SA_ONSTACK)
+		bsa->sa_flags |= SA_ONSTACK;
+	if (lsa->lsa_flags & LINUX_SA_RESTART)
+		bsa->sa_flags |= SA_RESTART;
+	if (lsa->lsa_flags & LINUX_SA_ONESHOT)
+		bsa->sa_flags |= SA_RESETHAND;
+	if (lsa->lsa_flags & LINUX_SA_NOMASK)
+		bsa->sa_flags |= SA_NODEFER;
+}
+
+static void
+bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
+{
+
+	bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
+#ifdef COMPAT_LINUX32
+	lsa->lsa_handler = (uintptr_t)bsa->sa_handler;
+#else
+	lsa->lsa_handler = bsa->sa_handler;
+#endif
+	lsa->lsa_restorer = 0;		/* unsupported */
+	lsa->lsa_flags = 0;
+	if (bsa->sa_flags & SA_NOCLDSTOP)
+		lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
+	if (bsa->sa_flags & SA_NOCLDWAIT)
+		lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
+	if (bsa->sa_flags & SA_SIGINFO)
+		lsa->lsa_flags |= LINUX_SA_SIGINFO;
+	if (bsa->sa_flags & SA_ONSTACK)
+		lsa->lsa_flags |= LINUX_SA_ONSTACK;
+	if (bsa->sa_flags & SA_RESTART)
+		lsa->lsa_flags |= LINUX_SA_RESTART;
+	if (bsa->sa_flags & SA_RESETHAND)
+		lsa->lsa_flags |= LINUX_SA_ONESHOT;
+	if (bsa->sa_flags & SA_NODEFER)
+		lsa->lsa_flags |= LINUX_SA_NOMASK;
+}
+
+int
+linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
+		   l_sigaction_t *linux_osa)
+{
+	struct sigaction act, oact, *nsa, *osa;
+	int error, sig;
+
+	if (!LINUX_SIG_VALID(linux_sig))
+		return (EINVAL);
+
+	osa = (linux_osa != NULL) ? &oact : NULL;
+	if (linux_nsa != NULL) {
+		nsa = &act;
+		linux_to_bsd_sigaction(linux_nsa, nsa);
+	} else
+		nsa = NULL;
+
+	if (linux_sig <= LINUX_SIGTBLSZ)
+		sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
+	else
+		sig = linux_sig;
+
+	error = kern_sigaction(td, sig, nsa, osa, 0);
+	if (error)
+		return (error);
+
+	if (linux_osa != NULL)
+		bsd_to_linux_sigaction(osa, linux_osa);
+
+	return (0);
+}
+
+
+int
+linux_signal(struct thread *td, struct linux_signal_args *args)
+{
+	l_sigaction_t nsa, osa;
+	int error;
+
+#ifdef DEBUG
+	if (ldebug(signal))
+		printf(ARGS(signal, "%d, %p"),
+		    args->sig, (void *)(uintptr_t)args->handler);
+#endif
+
+	nsa.lsa_handler = args->handler;
+	nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
+	LINUX_SIGEMPTYSET(nsa.lsa_mask);
+
+	error = linux_do_sigaction(td, args->sig, &nsa, &osa);
+	td->td_retval[0] = (int)(intptr_t)osa.lsa_handler;
+
+	return (error);
+}
+
+int
+linux_rt_sigaction(struct thread *td, struct linux_rt_sigaction_args *args)
+{
+	l_sigaction_t nsa, osa;
+	int error;
+
+#ifdef DEBUG
+	if (ldebug(rt_sigaction))
+		printf(ARGS(rt_sigaction, "%ld, %p, %p, %ld"),
+		    (long)args->sig, (void *)args->act,
+		    (void *)args->oact, (long)args->sigsetsize);
+#endif
+
+	if (args->sigsetsize != sizeof(l_sigset_t))
+		return (EINVAL);
+
+	if (args->act != NULL) {
+		error = copyin(args->act, &nsa, sizeof(l_sigaction_t));
+		if (error)
+			return (error);
+	}
+
+	error = linux_do_sigaction(td, args->sig,
+				   args->act ? &nsa : NULL,
+				   args->oact ? &osa : NULL);
+
+	if (args->oact != NULL && !error) {
+		error = copyout(&osa, args->oact, sizeof(l_sigaction_t));
+	}
+
+	return (error);
+}
+
+static int
+linux_do_sigprocmask(struct thread *td, int how, l_sigset_t *new,
+		     l_sigset_t *old)
+{
+	sigset_t omask, nmask;
+	sigset_t *nmaskp;
+	int error;
+
+	td->td_retval[0] = 0;
+
+	switch (how) {
+	case LINUX_SIG_BLOCK:
+		how = SIG_BLOCK;
+		break;
+	case LINUX_SIG_UNBLOCK:
+		how = SIG_UNBLOCK;
+		break;
+	case LINUX_SIG_SETMASK:
+		how = SIG_SETMASK;
+		break;
+	default:
+		return (EINVAL);
+	}
+	if (new != NULL) {
+		linux_to_bsd_sigset(new, &nmask);
+		nmaskp = &nmask;
+	} else
+		nmaskp = NULL;
+	error = kern_sigprocmask(td, how, nmaskp, &omask, 0);
+	if (error == 0 && old != NULL)
+		bsd_to_linux_sigset(&omask, old);
+
+	return (error);
+}
+
+int
+linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
+{
+	l_osigset_t mask;
+	l_sigset_t set, oset;
+	int error;
+
+#ifdef DEBUG
+	if (ldebug(sigprocmask))
+		printf(ARGS(sigprocmask, "%d, *, *"), args->how);
+#endif
+
+	if (args->mask != NULL) {
+		error = copyin(args->mask, &mask, sizeof(l_osigset_t));
+		if (error)
+			return (error);
+		LINUX_SIGEMPTYSET(set);
+		set.__bits[0] = mask;
+	}
+
+	error = linux_do_sigprocmask(td, args->how,
+				     args->mask ? &set : NULL,
+				     args->omask ? &oset : NULL);
+
+	if (args->omask != NULL && !error) {
+		mask = oset.__bits[0];
+		error = copyout(&mask, args->omask, sizeof(l_osigset_t));
+	}
+
+	return (error);
+}
+
+int
+linux_rt_sigprocmask(struct thread *td, struct linux_rt_sigprocmask_args *args)
+{
+	l_sigset_t set, oset;
+	int error;
+
+#ifdef DEBUG
+	if (ldebug(rt_sigprocmask))
+		printf(ARGS(rt_sigprocmask, "%d, %p, %p, %ld"),
+		    args->how, (void *)args->mask,
+		    (void *)args->omask, (long)args->sigsetsize);
+#endif
+
+	if (args->sigsetsize != sizeof(l_sigset_t))
+		return EINVAL;
+
+	if (args->mask != NULL) {
+		error = copyin(args->mask, &set, sizeof(l_sigset_t));
+		if (error)
+			return (error);
+	}
+
+	error = linux_do_sigprocmask(td, args->how,
+				     args->mask ? &set : NULL,
+				     args->omask ? &oset : NULL);
+
+	if (args->omask != NULL && !error) {
+		error = copyout(&oset, args->omask, sizeof(l_sigset_t));
+	}
+
+	return (error);
+}
+
+int
+linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
+{
+	struct proc *p = td->td_proc;
+	l_sigset_t mask;
+
+#ifdef DEBUG
+	if (ldebug(sgetmask))
+		printf(ARGS(sgetmask, ""));
+#endif
+
+	PROC_LOCK(p);
+	bsd_to_linux_sigset(&td->td_sigmask, &mask);
+	PROC_UNLOCK(p);
+	td->td_retval[0] = mask.__bits[0];
+	return (0);
+}
+
+int
+linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
+{
+	struct proc *p = td->td_proc;
+	l_sigset_t lset;
+	sigset_t bset;
+
+#ifdef DEBUG
+	if (ldebug(ssetmask))
+		printf(ARGS(ssetmask, "%08lx"), (unsigned long)args->mask);
+#endif
+
+	PROC_LOCK(p);
+	bsd_to_linux_sigset(&td->td_sigmask, &lset);
+	td->td_retval[0] = lset.__bits[0];
+	LINUX_SIGEMPTYSET(lset);
+	lset.__bits[0] = args->mask;
+	linux_to_bsd_sigset(&lset, &bset);
+	td->td_sigmask = bset;
+	SIG_CANTMASK(td->td_sigmask);
+	signotify(td);
+	PROC_UNLOCK(p);
+	return (0);
+}
+
+/*
+ * MPSAFE
+ */
+int
+linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
+{
+	struct proc *p = td->td_proc;
+	sigset_t bset;
+	l_sigset_t lset;
+	l_osigset_t mask;
+
+#ifdef DEBUG
+	if (ldebug(sigpending))
+		printf(ARGS(sigpending, "*"));
+#endif
+
+	PROC_LOCK(p);
+	bset = p->p_siglist;
+	SIGSETOR(bset, td->td_siglist);
+	SIGSETAND(bset, td->td_sigmask);
+	PROC_UNLOCK(p);
+	bsd_to_linux_sigset(&bset, &lset);
+	mask = lset.__bits[0];
+	return (copyout(&mask, args->mask, sizeof(mask)));
+}
+
+/*
+ * MPSAFE
+ */
+int
+linux_rt_sigpending(struct thread *td, struct linux_rt_sigpending_args *args)
+{
+	struct proc *p = td->td_proc;
+	sigset_t bset;
+	l_sigset_t lset;
+
+	if (args->sigsetsize > sizeof(lset))
+		return EINVAL;
+		/* NOT REACHED */
+
+#ifdef DEBUG
+	if (ldebug(rt_sigpending))
+		printf(ARGS(rt_sigpending, "*"));
+#endif
+
+	PROC_LOCK(p);
+	bset = p->p_siglist;
+	SIGSETOR(bset, td->td_siglist);
+	SIGSETAND(bset, td->td_sigmask);
+	PROC_UNLOCK(p);
+	bsd_to_linux_sigset(&bset, &lset);
+	return (copyout(&lset, args->set, args->sigsetsize));
+}
+
+/*
+ * MPSAFE
+ */
+int
+linux_rt_sigtimedwait(struct thread *td,
+	struct linux_rt_sigtimedwait_args *args)
+{
+	int error, sig;
+	l_timeval ltv;
+	struct timeval tv;
+	struct timespec ts, *tsa;
+	l_sigset_t lset;
+	sigset_t bset;
+	l_siginfo_t linfo;
+	ksiginfo_t info;
+
+#ifdef DEBUG
+	if (ldebug(rt_sigtimedwait))
+		printf(ARGS(rt_sigtimedwait, "*"));
+#endif
+	if (args->sigsetsize != sizeof(l_sigset_t))
+		return (EINVAL);
+
+	if ((error = copyin(args->mask, &lset, sizeof(lset))))
+		return (error);
+	linux_to_bsd_sigset(&lset, &bset);
+
+	tsa = NULL;
+	if (args->timeout) {
+		if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
+			return (error);
+#ifdef DEBUG
+		if (ldebug(rt_sigtimedwait))
+			printf(LMSG("linux_rt_sigtimedwait: "
+			    "incoming timeout (%d/%d)\n"),
+			    ltv.tv_sec, ltv.tv_usec);
+#endif
+		tv.tv_sec = (long)ltv.tv_sec;
+		tv.tv_usec = (suseconds_t)ltv.tv_usec;
+		if (itimerfix(&tv)) {
+			/* 
+			 * The timeout was invalid. Convert it to something
+			 * valid that will act as it does under Linux.
+			 */
+			tv.tv_sec += tv.tv_usec / 1000000;
+			tv.tv_usec %= 1000000;
+			if (tv.tv_usec < 0) {
+				tv.tv_sec -= 1;
+				tv.tv_usec += 1000000;
+			}
+			if (tv.tv_sec < 0)
+				timevalclear(&tv);
+#ifdef DEBUG
+			if (ldebug(rt_sigtimedwait))
+				printf(LMSG("linux_rt_sigtimedwait: "
+				    "converted timeout (%jd/%ld)\n"),
+				    (intmax_t)tv.tv_sec, tv.tv_usec);
+#endif
+		}
+		TIMEVAL_TO_TIMESPEC(&tv, &ts);
+		tsa = &ts;
+	}
+	error = kern_sigtimedwait(td, bset, &info, tsa);
+#ifdef DEBUG
+	if (ldebug(rt_sigtimedwait))
+		printf(LMSG("linux_rt_sigtimedwait: "
+		    "sigtimedwait returning (%d)\n"), error);
+#endif
+	if (error)
+		return (error);
+
+	sig = BSD_TO_LINUX_SIGNAL(info.ksi_signo);
+
+	if (args->ptr) {
+		memset(&linfo, 0, sizeof(linfo));
+		ksiginfo_to_lsiginfo(&info, &linfo, sig);
+		error = copyout(&linfo, args->ptr, sizeof(linfo));
+	}
+	if (error == 0)
+		td->td_retval[0] = sig; 
+
+	return (error);
+}
+
+int
+linux_kill(struct thread *td, struct linux_kill_args *args)
+{
+	struct kill_args /* {
+	    int pid;
+	    int signum;
+	} */ tmp;
+
+#ifdef DEBUG
+	if (ldebug(kill))
+		printf(ARGS(kill, "%d, %d"), args->pid, args->signum);
+#endif
+
+	/*
+	 * Allow signal 0 as a means to check for privileges
+	 */
+	if (!LINUX_SIG_VALID(args->signum) && args->signum != 0)
+		return (EINVAL);
+
+	if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
+		tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
+	else
+		tmp.signum = args->signum;
+
+	tmp.pid = args->pid;
+	return (sys_kill(td, &tmp));
+}
+
+static int
+linux_do_tkill(struct thread *td, l_int tgid, l_int pid, l_int signum)
+{
+	struct proc *proc = td->td_proc;
+	struct linux_emuldata *em;
+	struct proc *p;
+	ksiginfo_t ksi;
+	int error;
+
+	AUDIT_ARG_SIGNUM(signum);
+	AUDIT_ARG_PID(pid);
+
+	/*
+	 * Allow signal 0 as a means to check for privileges
+	 */
+	if (!LINUX_SIG_VALID(signum) && signum != 0)
+		return (EINVAL);
+
+	if (signum > 0 && signum <= LINUX_SIGTBLSZ)
+		signum = linux_to_bsd_signal[_SIG_IDX(signum)];
+
+	if ((p = pfind(pid)) == NULL) {
+		if ((p = zpfind(pid)) == NULL)
+			return (ESRCH);
+	}
+
+	AUDIT_ARG_PROCESS(p);
+	error = p_cansignal(td, p, signum);
+	if (error != 0 || signum == 0)
+		goto out;
+
+	error = ESRCH;
+	em = em_find(p, EMUL_DONTLOCK);
+
+	if (em == NULL) {
+#ifdef DEBUG
+		printf("emuldata not found in do_tkill.\n");
+#endif
+		goto out;
+	}
+	if (tgid > 0 && em->shared->group_pid != tgid)
+		goto out;
+
+	ksiginfo_init(&ksi);
+	ksi.ksi_signo = signum;
+	ksi.ksi_code = LINUX_SI_TKILL;
+	ksi.ksi_errno = 0;
+	ksi.ksi_pid = proc->p_pid;
+	ksi.ksi_uid = proc->p_ucred->cr_ruid;
+
+	error = pksignal(p, ksi.ksi_signo, &ksi);
+
+out:
+	PROC_UNLOCK(p);
+	return (error);
+}
+
+int
+linux_tgkill(struct thread *td, struct linux_tgkill_args *args)
+{
+
+#ifdef DEBUG
+	if (ldebug(tgkill))
+		printf(ARGS(tgkill, "%d, %d, %d"), args->tgid, args->pid, args->sig);
+#endif
+	if (args->pid <= 0 || args->tgid <=0)
+		return (EINVAL);
+
+	return (linux_do_tkill(td, args->tgid, args->pid, args->sig));
+}
+
+int
+linux_tkill(struct thread *td, struct linux_tkill_args *args)
+{
+#ifdef DEBUG
+	if (ldebug(tkill))
+		printf(ARGS(tkill, "%i, %i"), args->tid, args->sig);
+#endif
+	if (args->tid <= 0)
+		return (EINVAL);
+
+	return (linux_do_tkill(td, 0, args->tid, args->sig));
+}
+
+void
+ksiginfo_to_lsiginfo(ksiginfo_t *ksi, l_siginfo_t *lsi, l_int sig)
+{
+
+	lsi->lsi_signo = sig;
+	lsi->lsi_code = ksi->ksi_code;
+
+	switch (sig) {
+	case LINUX_SIGPOLL:
+		/* XXX si_fd? */
+		lsi->lsi_band = ksi->ksi_band;
+		break;
+	case LINUX_SIGCHLD:
+		lsi->lsi_pid = ksi->ksi_pid;
+		lsi->lsi_uid = ksi->ksi_uid;
+		lsi->lsi_status = ksi->ksi_status;
+		break;
+	case LINUX_SIGBUS:
+	case LINUX_SIGILL:
+	case LINUX_SIGFPE:
+	case LINUX_SIGSEGV:
+		lsi->lsi_addr = PTROUT(ksi->ksi_addr);
+		break;
+	default:
+		/* XXX SI_TIMER etc... */
+		lsi->lsi_pid = ksi->ksi_pid;
+		lsi->lsi_uid = ksi->ksi_uid;
+		break;
+	}
+	if (sig >= LINUX_SIGRTMIN) {
+		lsi->lsi_int = ksi->ksi_info.si_value.sival_int;
+		lsi->lsi_ptr = PTROUT(ksi->ksi_info.si_value.sival_ptr);
+	}
+}