linux-kernel - Re: [kernel-hardening] [PATCH v4] scripts: add leaking

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Message-ID: <87tvxzvvf8.fsf@concordia.ellerman.id.au>
Date:   Mon, 13 Nov 2017 12:06:51 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Frank Rowand <frowand.list@...il.com>,
        "Tobin C. Harding" <me@...in.cc>,
        kernel-hardening@...ts.openwall.com
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Theodore Ts'o <tytso@....edu>,
        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 <wilal.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        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,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: [kernel-hardening] [PATCH v4] scripts: add leaking_addresses.pl

Frank Rowand <frowand.list@...il.com> writes:
> Hi Michael,
>
> On 11/12/17 03:49, Michael Ellerman wrote:
...
>> 
>> On our bare metal machines the device tree comes from skiboot
>> (firmware), with some of the content provided by hostboot (other
>> firmware), both of which are open source, so in theory most of the
>> information is available in *some* source tree. But there's still
>> information about runtime allocations etc. that is not available in the
>> source anywhere.
>
> Thanks for the additional information. 
>
> Can you explain a little bit what "runtime allocations" are?  Are you
> referring to the memory reservation block, the memory node(s) and the
> chosen node?  Or other information?

Yeah I was thinking of memory reservations. They're under the
reserved-memory node as well as the reservation block, eg:

$ ls -1 /proc/device-tree/reserved-memory/
ibm,firmware-allocs-memory@...0000000
ibm,firmware-allocs-memory@...0000000
ibm,firmware-allocs-memory@...00000
ibm,firmware-allocs-memory@...000000
ibm,firmware-code@...00000
ibm,firmware-data@...00000
ibm,firmware-heap@...00000
ibm,firmware-stacks@...00000
ibm,hbrt-code-image@...d510000
ibm,hbrt-target-image@...d6a0000
ibm,hbrt-vpd-image@...d700000
ibm,slw-image@...da00000
ibm,slw-image@...de00000
ibm,slw-image@...e200000
ibm,slw-image@...e600000


There's also some new systems where a catalog of PMU events is stored in
flash as a DTB and then stitched into the device tree by skiboot before
booting Linux.

Anyway my point was mainly just that the device tree is not simply a
copy of something in the kernel source.

cheers