Re: sys_gettimeofday racy or not?

Chris Friesen
2004-06-25T04:53:37Z

Wichert Akkerman wrote:
> This just happened to catch my eye and it's probably perfectly
> valid, but if so please educate me on why it is. In kernel/time.c
> sys_gettimeofday() there is this code:
>
> if (unlikely(tz != NULL)) {
> if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
> return -EFAULT;
> }
>
> what prevents sys_tz from being changed while this code runs?

Nothing at all.

I suspect most people don't worry about it, since its use is deprecated. The
man page for gettimeofday() says "The use of the timezone struct is obsolete".

Chris