linux-kernel - Re: BKL use in ptrace

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Date:	Mon, 21 Dec 2009 18:02:37 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	Roland McGrath <roland@...hat.com>
Subject: Re: BKL use in ptrace

(add Roland)

On 12/20, Andi Kleen wrote:
>
> ptrace has this comment/BKL use:
>
>         /*
>          * This lock_kernel fixes a subtle race with suid exec
>          */
>         lock_kernel();
>
> But unless I'm blind I don't see execve actually getting the BKL
> anywhere. So is this comment outdated or misleading (is the race with exit?)
> or is there a bug?

I never understood this lock_kernel().

In any case it looks outdated. We were going to kill it "soon",
along with other ptrace changes.

Oleg.

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