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Message-ID: <20171017093119.6dd98919@gandalf.local.home>
Date: Tue, 17 Oct 2017 09:31:19 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Tobin C. Harding" <me@...in.cc>
Cc: kernel-hardening@...ts.openwall.com, Linus Torvalds
<torvalds@...ux-foundation.org>, Kees Cook <keescook@...omium.org>, Paolo
Bonzini <pbonzini@...hat.com>, Tycho Andersen <tycho@...ker.com>, "Roberts,
William C" <william.c.roberts@...el.com>, Tejun Heo <tj@...nel.org>, Jordan
Glover <Golden_Miller83@...tonmail.ch>, Greg KH
<gregkh@...uxfoundation.org>, Petr Mladek <pmladek@...e.com>, Joe Perches
<joe@...ches.com>, Ian Campbell <ijc@...lion.org.uk>, Sergey Senozhatsky
<sergey.senozhatsky@...il.com>, Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>, Chris Fries <cfries@...gle.com>, Dave
Weinstein <olorin@...gle.com>, Daniel Micay <danielmicay@...il.com>, Djalal
Harouni <tixxdz@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] printk: hash addresses printed with %p
On Tue, 17 Oct 2017 15:52:51 +1100
"Tobin C. Harding" <me@...in.cc> wrote:
> Currently there are many places in the kernel where addresses are being
> printed using an unadorned %p. Kernel pointers should be printed using
> %pK allowing some control via the kptr_restrict sysctl. Exposing addresses
> gives attackers sensitive information about the kernel layout in memory.
>
> We can reduce the attack surface by hashing all addresses printed with
> %p. This will of course break some users, forcing code printing needed
> addresses to be updated.
>
> For what it's worth, usage of unadorned %p can be broken down as follows
>
> git grep '%p[^KFfSsBRrbMmIiEUVKNhdDgCGO]' | wc -l
Does %p[FfSs] leak addresses? Well, I guess it does if they are not
found in kallsyms, but otherwise you have:
function+0x<offset>
-- Steve
>
> arch: 2512
> block: 20
> crypto: 12
> fs: 1221
> include: 147
> kernel: 109
> lib: 77
> mm: 120
> net: 1516
> security: 11
> sound: 168
> virt: 2
> drivers: 8420
>
> Add helper function siphash_1ulong(). Add function ptr_to_id() to map an
> address to a 32 bit unique identifier.
>
> Signed-off-by: Tobin C. Harding <me@...in.cc>
> ---
>
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