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Re: [kernel-hardening] Re: [PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT kernel config

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On Tue, Apr 18, 2017 at 6:40 AM, Alan Cox <gnomes@lxorguk.ukuu.org.uk> 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
me.

> 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

-- 
Kees Cook
Pixel Security

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[PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT kernel config Matt Brown <matt@nmatt.com> - 2017-04-17 08:10 +0200
  Re: [PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT kernel config Greg KH <gregkh@linuxfoundation.org> - 2017-04-17 09:00 +0200
    Re: [PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT kernel config Matt Brown <matt@nmatt.com> - 2017-04-18 06:40 +0200
    Re: [PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT kernel config Alan Cox <gnomes@lxorguk.ukuu.org.uk> - 2017-04-18 16:30 +0200
      Re: [kernel-hardening] Re: [PATCH 1/4] added SECURITY_TIOCSTI_RESTRICT  kernel config Kees Cook <keescook@chromium.org> - 2017-04-18 17:50 +0200

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