linux-kernel - Re: [PATCH] leaking_addresses: add generic 32-bit support

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Message-ID: <20171230103055.GC6042@caerus>
Date:   Sat, 30 Dec 2017 21:30:55 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Kaiwan N Billimoria <kaiwan.billimoria@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH] leaking_addresses: add generic 32-bit support

On Tue, Dec 26, 2017 at 07:48:55AM +0530, Kaiwan N Billimoria wrote:
> The script attempts to detect the architecture it's running upon; as of now,
> we explicitly support x86_64, PPC64 and x86_32.
> If it's one of them, we proceed "normally". If we fail to detect the arch,
> we fallback to 64-bit scanning, unless the user has passed either of these
> option switches: "--opt-32bit" and/or "--page-offset-32bit=<val>".
> 
> If so, we switch to scanning for leaked addresses based on the value of
> PAGE_OFFSET (via an auto-detected or fallback mechanism).
> 
> As of now, we have code (or "rules") to detect special cases for x86_64 and PPC64
> (in the get_address_re sub). Also, we now have also builtin "stubs", for lack of a better term, where additional rules for other 64-bit arch's can be plugged into the code,
> in future, as applicable.
> 
> Signed-off-by: Kaiwan N Billimoria <kaiwan.billimoria@...il.com>
> 
> ---
>  scripts/leaking_addresses.pl | 190 +++++++++++++++++++++++++++++++++++--------
>  1 file changed, 156 insertions(+), 34 deletions(-)
> 
> This patch is based on Tobin's suggestions and my replies to them (see prev email in this thread).

Hi,

Can you resend this with a version number please. Also can you include what testing you have done
please. I'm away on Christmas holidays at the moment but I'll review soon as I'm back.

Thanks,
Tobin.