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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 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;
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, <v, 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);
if (args->ptr) {
memset(&linfo, 0, sizeof(linfo));
linfo.lsi_signo = info.ksi_signo;
error = copyout(&linfo, args->ptr, sizeof(linfo));
}
/* Repost if we got an error. */
if (error && info.ksi_signo) {
PROC_LOCK(td->td_proc);
tdksignal(td, info.ksi_signo, &info);
PROC_UNLOCK(td->td_proc);
} else
td->td_retval[0] = info.ksi_signo;
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 (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;
}
}
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