Re: [PATCH] Fix x86_64 TIF_SYSCALL_TRACE race in entry.S
From: Andi Kleen
Date: Sat Oct 27 2007 - 15:05:19 EST
Mathieu Desnoyers <compudj@xxxxxxxxxxxxxxxxxx> 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
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