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Date:	Fri, 25 Jul 2014 16:43:20 -0700
From:	"H. Peter Anvin" <>
To:	Andy Lutomirski <>,
	"Eric W. Biederman" <>,
	Julien Tinnes <>,
	David Drysdale <>,
	Al Viro <>,
	Paolo Bonzini <>,
	LSM List <>,
	Greg Kroah-Hartman <>,
	Paul Moore <>,
	James Morris <>,
	Linux API <>,
	Meredydd Luff <>,
	Christoph Hellwig <>,
	"" <>,
	Kees Cook <>,
	"Theodore Ts'o" <>,
	Henrique de Moraes Holschuh <>,
Subject: Re: General flags to turn things off (getrandom, pid lookup, etc)

On 07/25/2014 11:30 AM, Andy Lutomirski wrote:
>     - 32-bit GDT code segments [huge attack surface]
>     - 64-bit GDT code segments [probably pointless]

I presume you mean s/GDT/LDT/.

We already don't allow 64-bit LDT code segments.  Also, it is unclear to
me how 32-bit LDT segments have a huge attack surface, given that there
will realistically always be a 32-bit *GDT* segment present.


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