From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Tobin C. Harding" <me@tobin.cc>
Subject: Re: [PATCH 0/3] add %pX specifier
Date: Wed, 11 Oct 2017 10:31:16 +1100
Message-ID: <20171010233116.GA2049@eros>
References: <1507676974-1298-1-git-send-email-me@tobin.cc>
 <CA+55aFyH5X2nx0kf_hPeOjMQYF-UX6r3ov61=VqTOLLZLE3-vQ@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: "kernel-hardening@lists.openwall.com"
        <kernel-hardening@lists.openwall.com>,
        KVM list <kvm@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Tycho Andersen <tycho@docker.com>,
        "Roberts, William C" <william.c.roberts@intel.com>,
        Tejun Heo <tj@kernel.org>,
        Jordan Glover <Golden_Miller83@protonmail.ch>,
        Greg KH <gregkh@linuxfoundation.org>,
        Petr Mladek <pmladek@suse.com>, Joe Perches <joe@perches.com>,
        Ian Campbell <ijc@hellion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Chris Fries <cfries@google.com>,
        Dave Weinstein
To: Linus Torvalds <torvalds@linux-foundation.org>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <CA+55aFyH5X2nx0kf_hPeOjMQYF-UX6r3ov61=VqTOLLZLE3-vQ@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On Tue, Oct 10, 2017 at 04:16:55PM -0700, Linus Torvalds wrote:
> On Tue, Oct 10, 2017 at 4:09 PM, Tobin C. Harding <me@tobin.cc> wrote:
> >
> > This patch is a softer version of Linus' suggestion because it does not change the behaviour of the
> > %p specifier. I don't see the benefit in making such a breaking change without addressing the issue
> > of %x (and I don't the balls to right now).
> 
> The thing is, this continues to have the exact same issue that %pK has
> - because it is opt-in, effectively nobody will actually use it.
> 
> That's why I would suggest that if we do this way, we really change %p
> and %pa to use the hashed value, to convert *everybody*. And then
> people who have a good reason to actually expose the pointer have to
> do the extra work and opt out.
> 
>                   Linus

Righto, I'll wait 24 hours and submit v2 with the change as suggested. I guess now is as good a time
as any annoy everybody and cause them to do work (for the greater good :)

Then I can direct effort at finding any users of %x for kernel addresses.

thanks,
Tobin.