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Date: Thu, 15 Dec 2016 19:14:22 -0500
From: Daniel Micay <danielmicay@...il.com>
To: kernel-hardening@...ts.openwall.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] Make static usermode helper
binaries constant
> So for statics, I think `static const char *` wins due to allowing
> merging (although it doesn't matter here). For non-statics, you end up
> with extra pointer constants. Those could get removed, but Linux
> doesn't
> have -fvisibility=hidden and I'm not sure how clever linkers are.
> Maybe
> setting up -fvisibility=hidden to work with monolithic non-module-
> enabled builds could actually be realistic. Expect it'd remove a fair
> bit of bloat but not sure how much would need to be marked as non-
> hiddenÂ
> other than the userspace ABI.
-fvisibility=hidden + LTO would be really awesome though, since that
doesn't depend on the cleverness of linkers. So much that could be
ripped out of real world monolithic builds. Kinda getting off-topic now
though. LTO is pretty scary from a security perspective due to how much
worse undefined behavior that was previously harmless can get.
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