[PATCH v21 2/2] arm64: expose FAR_EL1 tag bits in siginfo

[Catalin Marinas]

On Fri, Nov 20, 2020 at 12:33:46PM -0800, Peter Collingbourne wrote:
> The kernel currently clears the tag bits (i.e. bits 56-63) in the fault
> address exposed via siginfo.si_addr and sigcontext.fault_address. However,
> the tag bits may be needed by tools in order to accurately diagnose
> memory errors, such as HWASan [1] or future tools based on the Memory
> Tagging Extension (MTE).
> 
> Expose these bits via the arch_untagged_si_addr mechanism, so that
> they are only exposed to signal handlers with the SA_EXPOSE_TAGBITS
> flag set.
> 
> [1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
> 
> Signed-off-by: Peter Collingbourne <pcc at google.com>
> Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>
> Link: https://linux-review.googlesource.com/id/Ia8876bad8c798e0a32df7c2ce1256c4771c81446

Applied to arm64 (for-next/signal-tag-bits), thanks!

[2/2] arm64: expose FAR_EL1 tag bits in siginfo
      https://git.kernel.org/arm64/c/dceec3ff7807

-- 
Catalin