From: Andi Kleen <andi@firstfloor.org>
To: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Fix x86_64 TIF_SYSCALL_TRACE race in entry.S
Date: Sat, 27 Oct 2007 21:04:57 +0200 [thread overview]
Message-ID: <p73sl3wnzty.fsf@bingen.suse.de> (raw)
In-Reply-To: <20071027180837.GA18134@Krystal> (Mathieu Desnoyers's message of "Sat\, 27 Oct 2007 14\:08\:37 -0400")
Mathieu Desnoyers <compudj@krystal.dyndns.org> writes:
> We make sure that the thread flag read is coherent between our new test and the ALLWORK_MASK test by first saving it in a register used for both comparisons.
>
That doesn't make sense. If someone is setting those asynchronously you
can always race.
You should really just stop the process like ptrace does before changing
such things.
-Andi
next prev parent reply other threads:[~2007-10-27 19:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-26 19:37 Adding TIF_TRACE_KERNEL to x86_64 Mathieu Desnoyers
2007-10-27 18:08 ` [PATCH] Fix x86_64 TIF_SYSCALL_TRACE race in entry.S Mathieu Desnoyers
2007-10-27 19:04 ` Andi Kleen [this message]
2007-10-28 21:15 ` Mathieu Desnoyers
2007-10-28 21:21 ` Andi Kleen
2007-10-28 22:31 ` Mathieu Desnoyers
2007-10-27 19:00 ` Adding TIF_TRACE_KERNEL to x86_64 Andi Kleen
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