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Date: Wed, 31 May 2017 12:48:50 +1000 (AEST)
From: James Morris <>
To: Boris Lukashev <>
cc: Alan Cox <>, Matt Brown <>,
        Greg KH <>,
        "Serge E. Hallyn" <>,
        Kees Cook <>,,
        linux-security-module <>,
        linux-kernel <>
Subject: Re: Re: [PATCH v7 2/2] security: tty: make TIOCSTI
 ioctl require CAP_SYS_ADMIN

On Mon, 29 May 2017, Boris Lukashev wrote:

> With all due respect sir, i believe your review falls short of the
> purpose of this effort - to harden the kernel against flaws in
> userspace.

Which effort?  Kernel self protection is about protecting against flaws in 
the kernel.


  "This project starts with the premise that kernel bugs have a very long 
   lifetime, and that the kernel must be designed in ways to protect against 
   these flaws."

We need to avoid conflating:

- hardening the kernel against attack; and 
- modifying the kernel to try and harden userspace.

These patches are the latter, and the case for them is not as 

- James
James Morris

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