[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAGXu5jK_YfFLKt4vde__bzmhH9SCEz01ET9wyycYkhSSQj5+RA@mail.gmail.com>
Date: Sun, 27 May 2018 07:41:34 -0700
From: Kees Cook <keescook@...omium.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Salvatore Mesoraca <s.mesoraca16@...il.com>, Jann Horn <jannh@...gle.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
LSM List <linux-security-module@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
Andrew Morton <akpm@...ux-foundation.org>, Alexey Dobriyan <adobriyan@...il.com>,
Akinobu Mita <akinobu.mita@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>,
Arnd Bergmann <arnd@...db.de>, Davidlohr Bueso <dave@...olabs.net>
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
<torvalds@...ux-foundation.org> 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
--
Kees Cook
Pixel Security
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
