From: Jon Masters <jcm@redhat.com>
To: Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>
Cc: Kristina Martsenko <kristina.martsenko@arm.com>,
Mark Rutland <Mark.Rutland@arm.com>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
Andrew Jones <drjones@redhat.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Marc Zyngier <Marc.Zyngier@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Adam Wallis <awallis@codeaurora.org>,
Suzuki Poulose <Suzuki.Poulose@arm.com>,
Christoffer Dall <Christoffer.Dall@arm.com>,
Dave P Martin <Dave.Martin@arm.com>,
Amit Kachhap <Amit.Kachhap@arm.com>,
Ramana Radhakrishnan <ramana.radhakrishnan@foss.arm.com>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v5 11/17] arm64: docs: document pointer authentication
Date: Fri, 2 Nov 2018 02:02:03 -0400 [thread overview]
Message-ID: <d73e8824-bb8e-8172-4541-9be136453020@redhat.com> (raw)
Message-ID: <20181102060203.mtDg15tpkKg3m3lLplDb-NN9EFd0PB2t4D3H_oO0ZHo@z> (raw)
In-Reply-To: <20181019174524.GC4429@brain-police>
On 10/19/18 1:45 PM, Will Deacon wrote:
>>> I think an alternative solution is to just disable trapping of pointer
>>> auth instructions in KVM. This will mean that the instructions will
>>> behave the same in the guest as they do in the host. HINT-space
>>> instructions (including XPACLRI) will behave as NOPs (or perform their
>>> function, if enabled by the guest), and will not trap.
>>
>> OK, so this means disabling the trap (during early EL2 setup) but still
>> sanitizing the CPUID not to report the feature to EL1 unless fully
>> supported on all CPUs.
>
> ... which is perfectly sensible, but not actually my main concern here.
> I'm worried about the possibility of distributions shipping *now* with
> userspace that's built with these instructions. That stuff is going to
> break if/when it encounters v8.3 hardware, and I don't think we can do
> much about it other than alert them to the potential issue.
FYI tracking this for RHEL. It's not a problem currently. I'll alert our
tools teams to hold off on any PAC work until this is figured out.
Jon.
--
Computer Architect | Sent with my Fedora powered laptop
next prev parent reply other threads:[~2018-11-02 15:08 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-05 8:47 [PATCH 00/17] ARMv8.3 pointer authentication support Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 01/17] arm64: add pointer authentication register bits Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-11 16:28 ` Will Deacon
2018-10-11 16:28 ` Will Deacon
2018-10-12 8:53 ` Mark Rutland
2018-10-12 8:53 ` Mark Rutland
2018-10-12 8:56 ` Will Deacon
2018-10-12 8:56 ` Will Deacon
2018-10-12 9:50 ` Mark Rutland
2018-10-12 9:50 ` Mark Rutland
2018-10-05 8:47 ` [PATCH v5 02/17] arm64/kvm: consistently handle host HCR_EL2 flags Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 03/17] arm64/kvm: hide ptrauth from guests Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 04/17] arm64: Don't trap host pointer auth use to EL2 Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 05/17] arm64/cpufeature: detect pointer authentication Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 06/17] asm-generic: mm_hooks: allow hooks to be overridden individually Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 07/17] arm64: add basic pointer authentication support Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-11 16:00 ` Suzuki K Poulose
2018-10-11 16:00 ` Suzuki K Poulose
2018-10-19 11:15 ` Catalin Marinas
2018-10-19 11:15 ` Catalin Marinas
2018-10-19 11:24 ` Will Deacon
2018-10-19 11:24 ` Will Deacon
2018-10-19 15:36 ` Kees Cook
2018-10-19 15:36 ` Kees Cook
2018-10-19 15:49 ` Will Deacon
2018-10-19 15:49 ` Will Deacon
2018-10-19 16:05 ` Kees Cook
2018-10-19 16:05 ` Kees Cook
2018-10-19 16:16 ` Will Deacon
2018-10-19 16:16 ` Will Deacon
2018-10-19 15:54 ` Mark Rutland
2018-10-19 15:54 ` Mark Rutland
2018-10-19 16:49 ` Cyrill Gorcunov
2018-10-19 16:49 ` Cyrill Gorcunov
2018-11-14 18:11 ` Will Deacon
2018-11-14 18:11 ` Will Deacon
2018-11-15 10:25 ` Dave Martin
2018-11-15 10:25 ` Dave Martin
2018-10-23 8:36 ` Ramana Radhakrishnan
2018-10-23 8:36 ` Ramana Radhakrishnan
2018-10-23 10:20 ` Will Deacon
2018-10-23 10:20 ` Will Deacon
2018-10-05 8:47 ` [PATCH v5 08/17] arm64: expose user PAC bit positions via ptrace Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 09/17] arm64: perf: strip PAC when unwinding userspace Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 10/17] arm64: enable pointer authentication Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 11/17] arm64: docs: document " Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 9:04 ` Ramana Radhakrishnan
2018-10-05 9:04 ` Ramana Radhakrishnan
2018-10-16 16:14 ` Kristina Martsenko
2018-10-16 16:14 ` Kristina Martsenko
2018-10-19 11:35 ` Catalin Marinas
2018-10-19 11:35 ` Catalin Marinas
2018-10-19 11:47 ` Marc Zyngier
2018-10-19 11:47 ` Marc Zyngier
2018-10-19 12:22 ` Will Deacon
2018-10-19 12:22 ` Will Deacon
2018-10-19 14:42 ` Kristina Martsenko
2018-10-19 14:42 ` Kristina Martsenko
2018-10-19 15:10 ` Catalin Marinas
2018-10-19 15:10 ` Catalin Marinas
2018-10-19 17:45 ` Will Deacon
2018-10-19 17:45 ` Will Deacon
2018-11-02 6:02 ` Jon Masters [this message]
2018-11-02 6:02 ` Jon Masters
2018-10-24 10:56 ` Ramana Radhakrishnan
2018-10-24 10:56 ` Ramana Radhakrishnan
2018-10-15 22:35 ` Kees Cook
2018-10-15 22:35 ` Kees Cook
2018-11-02 9:46 ` Ramana Radhakrishnan
2018-11-02 9:46 ` Ramana Radhakrishnan
2018-10-05 8:47 ` [RFC 12/17] arm64: move ptrauth keys to thread_info Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-19 11:38 ` Catalin Marinas
2018-10-19 11:38 ` Catalin Marinas
2018-10-05 8:47 ` [RFC 13/17] arm64: install user ptrauth keys at kernel exit time Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [RFC 14/17] arm64: unwind: strip PAC from kernel addresses Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 8:47 ` [RFC 15/17] arm64: enable ptrauth earlier Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-06 12:51 ` Amit Kachhap
2018-10-06 12:51 ` Amit Kachhap
2018-10-05 8:47 ` [RFC 16/17] arm64: initialize and switch ptrauth kernel keys Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-06 12:56 ` Amit Kachhap
2018-10-06 12:56 ` Amit Kachhap
2018-10-05 8:47 ` [RFC 17/17] arm64: compile the kernel with ptrauth -msign-return-address Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko
2018-10-05 9:01 ` Ramana Radhakrishnan
2018-10-05 9:01 ` Ramana Radhakrishnan
2018-10-11 14:00 ` Kristina Martsenko
2018-10-11 14:00 ` Kristina Martsenko
2018-10-11 14:23 ` Vladimir Murzin
2018-10-11 14:23 ` Vladimir Murzin
2018-10-15 22:38 ` Kees Cook
2018-10-15 22:38 ` Kees Cook
2018-10-15 22:42 ` [PATCH 00/17] ARMv8.3 pointer authentication support Kees Cook
2018-10-15 22:42 ` Kees Cook
2018-11-13 16:17 ` Kristina Martsenko
2018-11-13 16:17 ` Kristina Martsenko
2018-11-13 23:09 ` Kees Cook
2018-11-13 23:09 ` Kees Cook
2018-11-14 15:54 ` Kristina Martsenko
2018-11-14 15:54 ` Kristina Martsenko
2018-11-14 21:47 ` Mark Rutland
2018-11-14 21:47 ` Mark Rutland
2018-11-14 22:48 ` Kees Cook
2018-11-14 22:48 ` Kees Cook
2018-10-19 12:36 ` Will Deacon
2018-10-19 12:36 ` Will Deacon
2018-10-23 8:39 ` Ramana Radhakrishnan
2018-10-23 8:39 ` Ramana Radhakrishnan
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