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Date:   Mon, 23 Nov 2020 18:56:20 +0000
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Peter Collingbourne <pcc@google.com>
Cc:     Evgenii Stepanov <eugenis@google.com>,
        Kostya Serebryany <kcc@google.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Dave Martin <Dave.Martin@arm.com>,
        Will Deacon <will@kernel.org>, Oleg Nesterov <oleg@redhat.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        "James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Kevin Brodsky <kevin.brodsky@arm.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        linux-api@vger.kernel.org, Helge Deller <deller@gmx.de>,
        David Spickett <david.spickett@linaro.org>
Subject: Re: [PATCH v21 2/2] arm64: expose FAR_EL1 tag bits in siginfo
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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@google.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@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