From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andi Kleen <ak@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
Chuck Ebbert <cebbert@redhat.com>,
Roland McGrath <roland@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Jeremy Fitzhardinge <jeremy@goop.org>,
zach@vmware.com
Subject: Re: [PATCH x86/mm 6/6] x86-64 ia32 ptrace get/putreg32 current task
Date: Thu, 29 Nov 2007 12:23:59 -0800 (PST) [thread overview]
Message-ID: <alpine.LFD.0.9999.0711291219230.8458@woody.linux-foundation.org> (raw)
In-Reply-To: <200711292111.26661.ak@suse.de>
On Thu, 29 Nov 2007, Andi Kleen wrote:
>
> How would you catch (common) the case of them having different bases in the
> GDT TLS entries? At some point the selector has to be reloaded, otherwise
> it won't be picked up by the CPU.
You're right. I somehow thought we were using the LDT for TLS entries,
which I guess we did back before kernel support, but yeah, we're using
per-CPU GDT entries, and would need to check that those match too.
So yeah, the only safe ones are the ones we don't ever change, and that is
basically just the kernel entries (that users cannot load anyway).
So scratch that. You're right - the NUL selector is the only special one
for the context switcher.
Linus
next prev parent reply other threads:[~2007-11-29 20:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-29 0:38 [PATCH x86/mm 1/6] x86-64 ia32 ptrace pt_regs cleanup Roland McGrath
2007-11-29 0:40 ` [PATCH x86/mm 2/6] x86-64 ptrace whitespace Roland McGrath
2007-11-29 0:40 ` [PATCH x86/mm 3/6] x86-32 " Roland McGrath
2007-11-29 0:41 ` [PATCH x86/mm 4/6] x86-64 ptrace get/putreg current task Roland McGrath
2007-11-29 17:39 ` Christoph Hellwig
2007-11-29 0:42 ` [PATCH x86/mm 5/6] x86-32 " Roland McGrath
2007-11-29 0:42 ` [PATCH x86/mm 6/6] x86-64 ia32 ptrace get/putreg32 " Roland McGrath
2007-11-29 17:34 ` Chuck Ebbert
2007-11-29 18:09 ` Linus Torvalds
2007-11-29 18:16 ` H. Peter Anvin
2007-11-29 18:31 ` Linus Torvalds
2007-11-29 18:45 ` H. Peter Anvin
2007-11-29 19:08 ` Linus Torvalds
2007-11-29 19:16 ` H. Peter Anvin
2007-11-29 19:27 ` Andi Kleen
2007-11-29 19:44 ` Ingo Molnar
2007-11-29 20:01 ` H. Peter Anvin
2007-12-01 23:44 ` Jeremy Fitzhardinge
2007-11-29 19:49 ` Linus Torvalds
2007-11-29 20:11 ` Andi Kleen
2007-11-29 20:23 ` Linus Torvalds [this message]
2007-11-29 18:17 ` Chuck Ebbert
2007-11-29 18:23 ` H. Peter Anvin
2007-11-29 22:25 ` Roland McGrath
2007-11-29 22:34 ` Linus Torvalds
2007-11-29 22:21 ` Roland McGrath
2007-11-29 23:00 ` Chuck Ebbert
2007-11-29 10:39 ` [PATCH x86/mm 1/6] x86-64 ia32 ptrace pt_regs cleanup Ingo Molnar
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