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.