Date: Thu, 10 Nov 2016 21:37:49 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Elena Reshetova <elena.reshetova@...el.com> Cc: kernel-hardening@...ts.openwall.com, keescook@...omium.org, arnd@...db.de, tglx@...utronix.de, mingo@...hat.com, h.peter.anvin@...el.com, will.deacon@....com, linux-kernel@...r.kernel.org Subject: Re: [RFC v4 PATCH 00/13] HARDENED_ATOMIC On Thu, Nov 10, 2016 at 10:24:35PM +0200, Elena Reshetova wrote: > This series brings the PaX/Grsecurity PAX_REFCOUNT > feature support to the upstream kernel. All credit for the > feature goes to the feature authors. > > The name of the upstream feature is HARDENED_ATOMIC > and it is configured using CONFIG_HARDENED_ATOMIC and > HAVE_ARCH_HARDENED_ATOMIC. > > This series only adds x86 support; other architectures are expected > to add similar support gradually. > > More information about the feature can be found in the following > commit messages. No, this should be here. As it stands this is completely without content. In any case, NAK on this approach. Its the wrong way around. _IF_ you want to do a non-wrapping variant, it must not be the default. Since you need to audit every single atomic_t user in the kernel anyway, it doesn't matter. But changing atomic_t to non-wrap by default is not robust, if you forgot one, you can then trivially dos the kernel. That said, I still don't much like this. I would much rather you make kref useful and use that. It still means you get to audit all refcounts in the kernel, but hey, you had to do that anyway.
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