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Message-ID: <20120812182330.GB3799@openwall.com>
Date: Sun, 12 Aug 2012 22:23:30 +0400
From: Solar Designer <solar@...nwall.com>
To: owl-dev@...ts.openwall.com
Subject: Re: kernel's -fstack-protector
On Sun, Aug 12, 2012 at 10:12:02PM +0400, Vasily Kulikov wrote:
> RHEL6.3'ish kernel is able to use SSP of gcc, but currently doesn't do it:
[...]
> Owl's gcc doesn't use %gs, but uses a global symbol. That's because our glibc
> doesn't support any sort of SSP and gcc fallbacks to using global symbol.
> That is a gcc compilation stage choice, so we cannot explicitly enable it for
> the kernel until glibc upgrade.
>
> So, for now we don't use SSP for the kernel.
Thanks for researching it. I think there's no need to do anything about
it yet - we'll upgrade glibc soon.
Alexander
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