linux-ext4 - Re: [PATCH] ext4: verify extent header depth

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Message-ID: <20160715042248.GD26465@thunk.org>
Date:	Fri, 15 Jul 2016 00:22:48 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Vegard Nossum <vegard.nossum@...cle.com>
Cc:	linux-ext4@...r.kernel.org,
	"Darrick J. Wong" <darrick.wong@...cle.com>
Subject: Re: [PATCH] ext4: verify extent header depth

On Wed, Jul 06, 2016 at 08:54:47PM -0400, Theodore Ts'o wrote:
> So we could arbitrarily limit eh_depth to say, 32 levels, or some
> such.  That will prevent the malicious corruption, while also making
> it very difficult for the malicious fallocate/punch hole workload
> scenario to be triggered.

I've decided to apply your patch with the limit raised to 32.  That
should be enough to prevent the malicious corruption cases.

       	  	    	    		  - Ted
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