From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] sysctl: some input constraints checks were added for
 /proc/sys/vm directory
Date: Tue, 8 Mar 2011 16:51:41 -0800
Message-ID: <20110308165141.3dc7e377.akpm@linux-foundation.org>
References: <1299082575-3084-1-git-send-email-pholasek@redhat.com>
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Cc: linux-kernel@vger.kernel.org, anton@redhat.com,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Ingo Molnar <mingo@elte.hu>,
	Dave Young <hidave.darkstar@gmail.com>,
	David Miller <davem@davemloft.net>,
	Don Zickus <dzickus@redhat.com>, linux-fsdevel@vger.kernel.org
To: Petr Holasek <pholasek@redhat.com>
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On Wed,  2 Mar 2011 17:16:14 +0100
Petr Holasek <pholasek@redhat.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.