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Message-ID: <20200930063254.GB1474755@kroah.com>
Date: Wed, 30 Sep 2020 08:32:54 +0200
From: Greg KH <greg@...ah.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2020-25641 kernel: soft lockup when
 submitting zero length bvecs.

On Wed, Sep 30, 2020 at 10:35:56AM +1000, Wade Mealing wrote:
> Gday,
> 
> A flaw was found in the Linux kernels implementation of biovec usage.  A
> zero-length biovec request issued to the block subsystem could cause the
> kernel to enter an infinite loop causing a denial of service. An attacker
> with a local account can issue requests to a block device can cause a
> denial of service.
> 
> This has been assigned CVE-2020-25641,
> 
> According to the fix commits "Introduced in":
> # git tag --contains 1bdc76aea115 | head -n 1
> v4.10

That's odd, and not the best way to do this, the commit really showed up
in 4.8-rc1:
	$ git describe --contains 1bdc76aea115
	v4.8-rc1~162^2~21

You forgot to sort by "version", which is what you need to do if you
want to try to look at tags, but then it's still a bit off:
	$ git tag --contains 1bdc76aea115 | sort -V | head -n 10
	v4.8
	v4.8-rc1
	v4.8-rc2
	v4.8-rc3
	v4.8-rc4
	v4.8-rc5
	v4.8-rc6
	v4.8-rc7
	v4.8-rc8
	v4.9

hope this helps,

greg k-h

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