From: Sasha Levin <sashal@kernel.org>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Fangrui Song <maskray@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
open list <linux-kernel@vger.kernel.org>,
stable@vger.kernel.org,
"open list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)"
<kvmarm@lists.cs.columbia.edu>, Mark Brown <broonie@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Marc Zyngier <maz@kernel.org>,
Kristina Martsenko <kristina.martsenko@arm.com>,
Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH stable v4.9 v2] arm64: entry: Place an SB sequence following an ERET instruction
Date: Fri, 10 Jul 2020 20:28:01 -0400 [thread overview]
Message-ID: <20200711002801.GE2722994@sasha-vm> (raw)
In-Reply-To: <20200709195034.15185-1-f.fainelli@gmail.com>
On Thu, Jul 09, 2020 at 12:50:23PM -0700, Florian Fainelli wrote:
>From: Will Deacon <will.deacon@arm.com>
>
>commit 679db70801da9fda91d26caf13bf5b5ccc74e8e8 upstream
>
>Some CPUs can speculate past an ERET instruction and potentially perform
>speculative accesses to memory before processing the exception return.
>Since the register state is often controlled by a lower privilege level
>at the point of an ERET, this could potentially be used as part of a
>side-channel attack.
>
>This patch emits an SB sequence after each ERET so that speculation is
>held up on exception return.
>
>Signed-off-by: Will Deacon <will.deacon@arm.com>
>[florian: Adjust hyp-entry.S to account for the label
> added change to hyp/entry.S]
>Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
I've queued it up, thanks!
--
Thanks,
Sasha
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next prev parent reply other threads:[~2020-07-11 0:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-09 19:50 [PATCH stable v4.9 v2] arm64: entry: Place an SB sequence following an ERET instruction Florian Fainelli
2020-07-11 0:28 ` Sasha Levin [this message]
2020-07-20 13:04 ` Greg KH
2020-07-20 18:26 ` Florian Fainelli
2020-08-06 20:00 ` Florian Fainelli
2020-08-07 13:14 ` Greg KH
2020-08-07 18:17 ` Florian Fainelli
2020-08-13 20:52 ` Florian Fainelli
2020-08-21 16:03 ` Will Deacon
2020-08-21 17:16 ` Florian Fainelli
2020-08-24 16:32 ` Will Deacon
2020-08-24 16:42 ` Florian Fainelli
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