Messages in this thread | | | Date | Tue, 30 Jul 2002 16:06:31 -0400 | From | Jakub Jelinek <> | Subject | Re: [PATCH] sanitize TLS API |
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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.
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