fixes for stack clash vulnerability

[Dan Mack]

Thanks Jov - I missed it!  Looks like it will MFC around Saturday :-)

Dan

On Wed, 28 Jun 2017, Jov wrote:

> There is a commit fix this: https://svnweb.freebsd.org/changeset/base/320317
>
> Jov
>
> 2017年6月28日 10:27 PM，"Dan Mack" <mack at macktronics.com>写道：
>
>> FreeBSD is mentioned as being vulnerable to this and Qualsys has working
>> exploits which might be released soon:
>>
>>   https://blog.qualys.com/securitylabs/2017/06/19/the-stack-clash
>>
>> I don't remember seeing an advisory or seeing any fixes on the svn commit
>> stream so just curious.
>>
>> Dan
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