linux-kernel - Re: [BUG]memblock: fix overflow of array index

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Message-ID: <CAE9FiQUyF+yw4vNL1YziGtm9wXgGSy55nesB+BxM-gG8Zu=YtQ@mail.gmail.com>
Date:	Wed, 25 Apr 2012 17:54:57 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Peter Teoh <htmldeveloper@...il.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-mm@...ck.org
Subject: Re: [BUG]memblock: fix overflow of array index

On Wed, Apr 25, 2012 at 5:50 PM, Peter Teoh <htmldeveloper@...il.com> wrote:
> Thanks for the reply.   Just an educational question:  is it possible
> to set one-byte per memblock?    And what is the minimum memblock
> size?

yes. 1 byte.

>
> Even if 2G memblock is a huge number, it still seemed like a bug to me
> that there is no check on the maximum number (which is 2G) of this
> variable (assuming signed int).   Software can always purposely push
> that number up and the system can panic?

before slab is ready? how?

Thanks

Yinghai
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