linux-kernel - Re: [PATCH] Remove BKL from sysctl(2)

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Date:	23 Jan 2008 12:09:05 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Alexey Dobriyan <adobriyan@...il.com>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Remove BKL from sysctl(2)

Alan Cox <alan@...rguk.ukuu.org.uk> writes:
> 
> There are cases that updating the corepath name and dumping a core at the
> same moment can result in the wrong thing being exec()'d or a file being
> opened which is a mix of the old and new name and could go anywhere.
> 
> I see two variants on your patch that work
> 
> #1	Replace the lock_kernel with a sysctl_update mutex and fix both
> paths
> #2	Add locking specifically to the corename path

Doesn't that apply to pretty much all proc_dostring users, not just
corename? 

Some of them might be already broken if their readers don't take BKL.
Also possibly some of the proc_dointvec for multiple numbers.

-Andi
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