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authorAl Viro2017-06-07 09:42:36 +0100
committerThomas Gleixner2017-06-14 00:00:43 +0200
commitb0dc12426ec404de99d7e75a12a22d9201d90914 (patch)
tree60927afef817fa4364bcc4e6206f6a4c1624e53c /kernel/time
parent1acbe7708b0313b33287bb4ffcbf26462ea3c588 (diff)
posix-timers: Take compat timer_gettime(2) to native one
... and get rid of set_fs() in there Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <john.stultz@linaro.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20170607084241.28657-11-viro@ZenIV.linux.org.uk
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/posix-stubs.c1
-rw-r--r--kernel/time/posix-timers.c43
2 files changed, 35 insertions, 9 deletions
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index ad263df132d6..f4a1962d1729 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -43,6 +43,7 @@ SYS_NI(alarm);
#endif
COMPAT_SYS_NI(clock_adjtime);
COMPAT_SYS_NI(timer_settime);
+COMPAT_SYS_NI(timer_gettime);
/*
* We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index a73feac191f9..e82bb1fd614e 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -690,11 +690,8 @@ void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting)
}
/* Get the time remaining on a POSIX.1b interval timer. */
-SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
- struct itimerspec __user *, setting)
+static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting)
{
- struct itimerspec64 cur_setting64;
- struct itimerspec cur_setting;
struct k_itimer *timr;
const struct k_clock *kc;
unsigned long flags;
@@ -704,21 +701,49 @@ SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
if (!timr)
return -EINVAL;
- memset(&cur_setting64, 0, sizeof(cur_setting64));
+ memset(setting, 0, sizeof(*setting));
kc = timr->kclock;
if (WARN_ON_ONCE(!kc || !kc->timer_get))
ret = -EINVAL;
else
- kc->timer_get(timr, &cur_setting64);
+ kc->timer_get(timr, setting);
unlock_timer(timr, flags);
+ return ret;
+}
- cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
- if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
- return -EFAULT;
+/* Get the time remaining on a POSIX.1b interval timer. */
+SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
+ struct itimerspec __user *, setting)
+{
+ struct itimerspec64 cur_setting64;
+ int ret = do_timer_gettime(timer_id, &cur_setting64);
+ if (!ret) {
+ struct itimerspec cur_setting;
+ cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
+ if (copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
+ ret = -EFAULT;
+ }
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
+ struct compat_itimerspec __user *, setting)
+{
+ struct itimerspec64 cur_setting64;
+
+ int ret = do_timer_gettime(timer_id, &cur_setting64);
+ if (!ret) {
+ struct itimerspec cur_setting;
+ cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
+ if (put_compat_itimerspec(setting, &cur_setting))
+ ret = -EFAULT;
+ }
return ret;
}
+#endif
/*
* Get the number of overruns of a POSIX.1b interval timer. This is to