linux-kernel - Re: [PATCH] lib/vsprintf: make-printk-non-secret printks all addresses as unhashed

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Date:   Wed, 3 Feb 2021 10:53:17 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Timur Tabi <timur@...nel.org>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        roman.fietze@...na.com, John Ogness <john.ogness@...utronix.de>,
        Akinobu Mita <akinobu.mita@...il.com>
Subject: Re: [PATCH] lib/vsprintf: make-printk-non-secret printks all
 addresses as unhashed

On Tue, Feb 02, 2021 at 02:51:00PM -0800, Linus Torvalds wrote:
> On Tue, Feb 2, 2021 at 2:34 PM Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> >   "I also suspect that everybody has already accepted that KASLR isn't
> >    really working locally anyway (due to all the hw leak models with
> >    cache and TLB timing), so anybody who can look at kernel messages
> >    already probably could figure most of those things out."
> 
> Honestly, if you have to pass a kernel command line, and there's a big
> notice in the kernel messages about this, I no longer care.

Okay, cool; it's fine by me too. I prefer this kind of "boot into debug
mode" switch to having lots of %px scattered around in questionable
places. :)

I will update the %p deprecation docs.

-- 
Kees Cook