Re: [kernel-hardening] Re: [PATCH 4/4] refcount: Report failures through CHECK_DATA_CORRUPTION

[Peter Zijlstra]

On Tue, Feb 07, 2017 at 01:50:20PM +0000, Mark Rutland wrote:
> > Right something along those lines. (a) will need GCC help, and (b) would
> > be kernel-arch specific. So this isn't something we can quickly do.
> 
> I agree this isn't something that can be hacked together quickly, and
> certainly shouldn't block these patches.
> 
> However, I don't think we need anything new from GCC, and I think we
> already have a generic API for (b).
> 
> For (a) we don't need new GCC help if we do something like we did in
> commit 72c5839515260dce to do the mangling. Prepend a prefix to the
> register, e.g. changing 'x0' to '__pt_regs_offset_x0', which we arrange
> to hold the correct value.

I'm not sure I can decipher that commit and therefore have no idea if
something similar can be done for other architectures.