Re: [PATCH] sanitize TLS API

[Jakub Jelinek]

On Tue, Jul 30, 2002 at 09:00:09PM +0200, Ingo Molnar wrote:
> 
> On Tue, 30 Jul 2002, Christoph Hellwig wrote:
> 
> > Currently sys_set_thread_area has a magic flags argument that might
> > change it's behaivour completly.
> > 
> > Split out the TLS_FLAG_CLEAR case that has nothing in common with the
> > rest into it's own syscall, sys_clear_thread_area and change the second
> > argument to int writable.
> 
> i did not feel like wasting two syscall slots for this, but the cleanups
> look fine to me otherwise.

Actually, is the clear operation really necessary?
IMHO the best clear is movw $0x03, %gs, then all accesses through %gs will
trap. Calling set_thread_area (0, 1); will result in 0xb segment
acting exactly like %ds or %es.

	Jakub