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Date: Mon, 11 Jul 2016 17:19:23 +0200
From: Florian Weimer <>
Subject: Re: CVE-2016-5011: util-linux: Extended partition loop
 in MBR partition table leads to DoS

On 07/11/2016 01:32 PM, Cedric Buissart wrote:

> I looked at other projects to see what is being done to prevent this
> particular loop from happening. Until now, tools I checked are protected
> either by detecting the loop (i.e.: actively searching for a relative
> offset of 0 for the next EBR, as done by this util-linux patch; partprobe
> and fdisk are doing that), or enforcing a limit on the maximum number of
> partitions for a device (Linux kernel, kpartx & other tools I currently
> checked)

How does util-linux protect against loops which are non-empty?  Does it 
reject negative offsets?


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