linux-kernel - Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size

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Message-ID: <Pine.LNX.4.64.0710180201060.13576@schroedinger.engr.sgi.com>
Date:	Thu, 18 Oct 2007 02:03:39 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Jan Kara <jack@...e.cz>, cmm@...ibm.com,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	sho@...s.nec.co.jp
Subject: Re: [PATCH 2/2] ext2: Avoid rec_len overflow with 64KB block size

On Wed, 17 Oct 2007, Andrew Morton wrote:

> b) what happens when an old ext2 driver tries to read and/or write this
>    directory entry?  Do we need a compat flag for it?

Old ext2 only supports up to 4k

include/linux/ext2_fs.h:

#define EXT2_MIN_BLOCK_SIZE             1024
#define EXT2_MAX_BLOCK_SIZE             4096
#define EXT2_MIN_BLOCK_LOG_SIZE           10

Should fail to mount the volume since the block size is too large.

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