linux-kernel - Re: [PATCH] sysctl: some input constraints checks were added for /proc/sys/vm directory

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Message-Id: <20110308165141.3dc7e377.akpm@linux-foundation.org>
Date:	Tue, 8 Mar 2011 16:51:41 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Petr Holasek <pholasek@...hat.com>
Cc:	linux-kernel@...r.kernel.org, anton@...hat.com,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Dave Young <hidave.darkstar@...il.com>,
	David Miller <davem@...emloft.net>,
	Don Zickus <dzickus@...hat.com>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] sysctl: some input constraints checks were added for
 /proc/sys/vm directory

On Wed,  2 Mar 2011 17:16:14 +0100
Petr Holasek <pholasek@...hat.com> wrote:

> There were added boundaries of allowed input ranges for: dirty_expire_centisecs,
> drop_caches, overcommit_memory, page-cluster and panic_on_oom.
> 
> ...
>

Well..  It's a non-back-compatible userspace interface change.

Yes, it's unlikely that any userspace was doing, for example, "echo 7 >
/proc/sys/vm/drop_caches".  But if it was, we just broke it.
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