linux-kernel - Re: [PATCH 04/10] proc: fix PAGE_SIZE limit of /proc/$PID/cmdline

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Message-Id: <20140717155346.afadf6243dc6c0ebfda95853@linux-foundation.org>
Date:	Thu, 17 Jul 2014 15:53:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/10] proc: fix PAGE_SIZE limit of /proc/$PID/cmdline

On Thu, 17 Jul 2014 00:32:47 +0300 Alexey Dobriyan <adobriyan@...il.com> wrote:

> Convert /proc/$PID/cmdline to seq_file interface.
> 
> XXX

Unsure what XXX signifies.

> This one must be buggy.
> 
> seq_file buffer is adjustable, so userspace can execute itself
> with huge command line (which can be arbitrarily long now), then read 1 byte.
> 
> Voila, whole command line now is in kmalloced/vmalloced memory.
> 
> Imposing limit is trivial but equally lame to current PAGE_SIZE limit.

Confused. Why send the patch if you don't like it?

Why not go ahead and impose the PAGE_SIZE limit?
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