From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Laight <David.Laight@ACULAB.COM>
Subject: RE: [PATCH v4] scripts: add leaking_addresses.pl
Date: Tue, 7 Nov 2017 13:56:05 +0000
Message-ID: <063D6719AE5E284EB5DD2968C1650D6DD00B3BD1@AcuExch.aculab.com>
References: <1510050731-32446-1-git-send-email-me@tobin.cc>
Mime-Version: 1.0
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: 8BIT
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Theodore Ts'o <tytso@mit.edu>,
        Linus Torvalds <torvalds@linux-foundation.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 <wilal.deacon@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Chris Fries <cfries@google.com>,
        Dave Weinstein <olorin@google.com>,
        Daniel Micay <danielmic
To: "'Tobin C. Harding'" <me@tobin.cc>,
        "kernel-hardening@lists.openwall.com"
        <kernel-hardening@lists.openwall.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <1510050731-32446-1-git-send-email-me@tobin.cc>
Content-Language: en-US
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

From: Tobin C. Harding
> Sent: 07 November 2017 10:32
>
> Currently we are leaking addresses from the kernel to user space. This
> script is an attempt to find some of those leakages. Script parses
> `dmesg` output and /proc and /sys files for hex strings that look like
> kernel addresses.
...

Maybe the %p that end up in dmesg (via the kernel message buffer) should
be converted to text in a form that allows the code that reads them to
substitute alternate text for non-root users?

Then the actual addresses will be available to root (who can probably
get most by other means) but not to the casual observer.

	David