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Date: Wed, 28 Feb 2018 09:25:50 +0100
From: Florian Weimer <fweimer@...hat.com>
To: Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>
Cc: P J P <ppandit@...hat.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
P J P <pjp@...oraproject.org>
Subject: Re: [PATCH 0/1] Zero initialise kernel stack variables
On 02/28/2018 12:38 AM, Kees Cook wrote:
> That's a surprisingly small text change! I'd love to see benchmarks
> too.
When we benchmarked this a while back, we saw a measurable performance
hit for processing small packet processing (both UDP and TCP). I
assumed this was due to the initialization of the socket address
structure. Unfortunately, this was a place where past leaks happened.
My feeling at the time was that the return path for the socket address
would have to be overhauled, such that returning a partially initialized
result would be prevent by the API, without having to clear the entire
return buffer.
Apart from that, we didn't see any changes in performance.
> Are you able to verify this is initializing the
> passed-by-reference variables too?
Shouldn't the initialization happen in the caller?
Thanks,
Florian
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