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posix-timers: Take compat timer_gettime(2) to native one

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... 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
This commit is contained in:
Al Viro 2017-06-07 09:42:36 +01:00 committed by Thomas Gleixner
parent 1acbe7708b
commit b0dc12426e
3 changed files with 37 additions and 28 deletions
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17
kernel/compat.c
View File

@ -635,23 +635,6 @@ COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
return sys_timer_create(which_clock, event, created_timer_id);
}
COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
struct compat_itimerspec __user *, setting)
{
long err;
mm_segment_t oldfs;
struct itimerspec ts;
oldfs = get_fs();
set_fs(KERNEL_DS);
err = sys_timer_gettime(timer_id,
(struct itimerspec __user *) &ts);
set_fs(oldfs);
if (!err && put_compat_itimerspec(setting, &ts))
return -EFAULT;
return err;
}
COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
struct compat_timespec __user *, tp)
{

1
kernel/time/posix-stubs.c
View File

@ -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

47
kernel/time/posix-timers.c
View File

@ -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;
@ -704,22 +701,50 @@ 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);
cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
return -EFAULT;
return ret;
}
/* 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
* be the overrun of the timer last delivered. At the same time we are