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Date: Tue, 18 Apr 2017 08:49:10 -0700
From: Kees Cook <>
To: Alan Cox <>
Cc: Greg KH <>, Matt Brown <>, 
	James Morris <>, Andrew Morton <>, 
	linux-security-module <>, LKML <>, 
	"" <>
 kernel config

On Tue, Apr 18, 2017 at 6:40 AM, Alan Cox <> wrote:
>> Since tty sessions are usually separated by different users, how would
>> they have the same one and yet need something like this?
>> Also, why not put this in the tty config section?
> The normal attack use case people argue about is a rogue process on the
> users machine sitting there waiting until the user has logged in to a
> remote machine and is idle and then doing stuff.

It's still a threat, though, and adding this with default n to allow
the more paranoid builders a chance to mitigate it seems reasonable to

> Attackers of course don't bother doing that because it's easier to get
> the user to run a different ssh client instead.

Attackers will always take the easiest route, so we have to keep
killing the low hanging fruit.


Kees Cook
Pixel Security

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