linux-kernel - Re: [Patch] Convert max_user

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Message-Id: <20101027210855.11c5a564.akpm@linux-foundation.org>
Date:	Wed, 27 Oct 2010 21:08:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Robin Holt <holt@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [Patch] Convert max_user_watches to long.

On Wed, 27 Oct 2010 19:03:55 -0700 (PDT) Davide Libenzi <davidel@...ilserver.org> wrote:

> > Is the expected use case one-watch-per-user-per-fd?  If so, then
> > perhaps the max number of user_watches should have some realtionship
> > with the max number of fds?
> 
> Yes, the expected case is one watch per fd, but the reason the watch limit 
> went in in the first place, was because of DoS potential of someone not 
> playing nicely.

Sometimes DoS's are accidental.  It only takes 25 people to be running
the same buggy (eg, slowly-leaky) app (or shared lib) at the same time...

There are surely plenty of ways of that sort of thing happening, of
course.  Not that this fact actually improves anything.
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