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Date: Sun, 27 May 2018 07:41:34 -0700
From: Kees Cook <>
To: Linus Torvalds <>
Cc: Salvatore Mesoraca <>, Jann Horn <>, 
	Kernel Hardening <>, 
	LSM List <>, 
	Linux Kernel Mailing List <>, linux-mm <>, 
	Andrew Morton <>, Alexey Dobriyan <>, 
	Akinobu Mita <>, Dmitry Vyukov <>, 
	Arnd Bergmann <>, Davidlohr Bueso <>
Subject: Re: [PATCH] proc: prevent a task from writing on its own /proc/*/mem

On Sat, May 26, 2018 at 6:33 PM, Linus Torvalds
<> wrote:
> Thus commit f511c0b17b08 "Yes, people use FOLL_FORCE ;)"
> Side note, that very sam ecommit f511c0b17b08 is also the explanation for
> why the patch under discussion now seems broken.
> People really do use "write to /proc/self/mem" as a way to keep the
> mappings read-only, but have a way to change them when required.

Ah! Yes, that is the commit I was trying to find. Thanks!


Kees Cook
Pixel Security

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