From: Jakub Jelinek <jakub@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Christoph Hellwig <hch@lst.de>,
Linus Torvalds <torvalds@transmeta.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sanitize TLS API
Date: Tue, 30 Jul 2002 16:06:31 -0400 [thread overview]
Message-ID: <20020730160631.R1596@devserv.devel.redhat.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0207302059060.22902-100000@localhost.localdomain>; from mingo@elte.hu on Tue, Jul 30, 2002 at 09:00:09PM +0200
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
next prev parent reply other threads:[~2002-07-30 20:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-30 15:43 [PATCH] sanitize TLS API Christoph Hellwig
2002-07-30 19:00 ` Ingo Molnar
2002-07-30 20:06 ` Jakub Jelinek [this message]
2002-07-30 20:16 ` Ingo Molnar
2002-07-31 8:52 ` Andi Kleen
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