Commit-ID: 2482097c6c0f01ad74c9b2cff120a519ac59846e
Gitweb: http://git.kernel.org/tip/2482097c6c0f01ad74c9b2cff120a519ac59846e
Author: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 7 Jun 2017 09:42:39 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 14 Jun 2017 00:00:45 +0200
posix-timers: Move compat_timer_create() to native, get rid of set_fs()
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170607084241.28657-14-viro@xxxxxxxxxxxxxxxxxx
---
kernel/compat.c | 18 --------------
kernel/time/posix-stubs.c | 1 +
kernel/time/posix-timers.c | 59 ++++++++++++++++++++++++++++++++--------------
3 files changed, 42 insertions(+), 36 deletions(-)
diff --git a/kernel/compat.c b/kernel/compat.c
index 582c38b..4544eb6 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -580,24 +580,6 @@ int put_compat_itimerspec(struct compat_itimerspec __user *dst,
return 0;
}
-COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
- struct compat_sigevent __user *, timer_event_spec,
- timer_t __user *, created_timer_id)
-{
- struct sigevent __user *event = NULL;
-
- if (timer_event_spec) {
- struct sigevent kevent;
-
- event = compat_alloc_user_space(sizeof(*event));
- if (get_compat_sigevent(&kevent, timer_event_spec) ||
- copy_to_user(event, &kevent, sizeof(*event)))
- return -EFAULT;
- }
-
- return sys_timer_create(which_clock, event, created_timer_id);
-}
-
/*
* We currently only need the following fields from the sigevent
* structure: sigev_value, sigev_signo, sig_notify and (sometimes
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index a375c31..38f3b20 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -41,6 +41,7 @@ SYS_NI(setitimer);
#ifdef __ARCH_WANT_SYS_ALARM
SYS_NI(alarm);
#endif
+COMPAT_SYS_NI(timer_create);
COMPAT_SYS_NI(clock_adjtime);
COMPAT_SYS_NI(timer_settime);
COMPAT_SYS_NI(timer_gettime);
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 61a5fb9..c9f45a8 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -490,15 +490,12 @@ static int common_timer_create(struct k_itimer *new_timer)
}
/* Create a POSIX.1b interval timer. */
-
-SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
- struct sigevent __user *, timer_event_spec,
- timer_t __user *, created_timer_id)
+static int do_timer_create(clockid_t which_clock, struct sigevent *event,
+ timer_t __user *created_timer_id)
{
const struct k_clock *kc = clockid_to_kclock(which_clock);
struct k_itimer *new_timer;
int error, new_timer_id;
- sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
if (!kc)
@@ -523,29 +520,25 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
new_timer->kclock = kc;
new_timer->it_overrun = -1;
- if (timer_event_spec) {
- if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
- error = -EFAULT;
- goto out;
- }
+ if (event) {
rcu_read_lock();
- new_timer->it_pid = get_pid(good_sigevent(&event));
+ new_timer->it_pid = get_pid(good_sigevent(event));
rcu_read_unlock();
if (!new_timer->it_pid) {
error = -EINVAL;
goto out;
}
+ new_timer->it_sigev_notify = event->sigev_notify;
+ new_timer->sigq->info.si_signo = event->sigev_signo;
+ new_timer->sigq->info.si_value = event->sigev_value;
} else {
- memset(&event.sigev_value, 0, sizeof(event.sigev_value));
- event.sigev_notify = SIGEV_SIGNAL;
- event.sigev_signo = SIGALRM;
- event.sigev_value.sival_int = new_timer->it_id;
+ new_timer->it_sigev_notify = SIGEV_SIGNAL;
+ new_timer->sigq->info.si_signo = SIGALRM;
+ memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t));
+ new_timer->sigq->info.si_value.sival_int = new_timer->it_id;
new_timer->it_pid = get_pid(task_tgid(current));
}
- new_timer->it_sigev_notify = event.sigev_notify;
- new_timer->sigq->info.si_signo = event.sigev_signo;
- new_timer->sigq->info.si_value = event.sigev_value;
new_timer->sigq->info.si_tid = new_timer->it_id;
new_timer->sigq->info.si_code = SI_TIMER;
@@ -576,6 +569,36 @@ out:
return error;
}
+SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
+ struct sigevent __user *, timer_event_spec,
+ timer_t __user *, created_timer_id)
+{
+ if (timer_event_spec) {
+ sigevent_t event;
+
+ if (copy_from_user(&event, timer_event_spec, sizeof (event)))
+ return -EFAULT;
+ return do_timer_create(which_clock, &event, created_timer_id);
+ }
+ return do_timer_create(which_clock, NULL, created_timer_id);
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
+ struct compat_sigevent __user *, timer_event_spec,
+ timer_t __user *, created_timer_id)
+{
+ if (timer_event_spec) {
+ sigevent_t event;
+
+ if (get_compat_sigevent(&event, timer_event_spec))
+ return -EFAULT;
+ return do_timer_create(which_clock, &event, created_timer_id);
+ }
+ return do_timer_create(which_clock, NULL, created_timer_id);
+}
+#endif
+
/*
* Locking issues: We need to protect the result of the id look up until
* we get the timer locked down so it is not deleted under us. The
--
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