Re: [PATCH] time: fix a assignment error in ntp module

[Miroslav Lichvar]

On Mon, Jun 17, 2019 at 02:14:57PM +0200, Thomas Gleixner wrote:
> On Mon, 17 Jun 2019, çåç wrote:
> > Yes,the  >UINT_MAX value can be passed by
> > syscall adjtimex->do_adjtimex->__do_adjtimex->process_adjtimex_modes by the
> > proper arugments.
> 
> So there is clearly some sanity check missing, but surely not that
> type cast.

As the offset is saved in an int (and returned via adjtimex() in the
tai field), should be the maximum INT_MAX?

We probably also want to avoid overflow in the offset on a leap second
and the CLOCK_TAI clock itself, so maybe it would make sense to
specify a much smaller maximum like 1000000?

Even 1000 should be good enough for near future. Negative values are
not allowed anyway. If the Earth's rotation changed significantly
(e.g. hitting a very large asteroid), there probably wouldn't be
anyone left to care about TAI. 

-- 
Miroslav Lichvar