From: jglauber@cavium.com (Jan Glauber)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH -stable] arm64: mm: don't write garbage into TTBR1_EL1 register
Date: Wed, 28 Feb 2018 11:23:35 +0100 [thread overview]
Message-ID: <20180228102335.GA6619@wintermute> (raw)
In-Reply-To: <20180226113050.GE8736@arm.com>
On Mon, Feb 26, 2018 at 11:30:50AM +0000, Will Deacon wrote:
> Damnit, sorry again. I changed the argument order of phys_to_ttbr along
> the way, so must've confused myself during the backporting exercise. It's
> also one of those things that will lead to potential TLB corruption in rare
> circumstances where the junk in TTBR1 ends up giving a valid translation,
> so it didn't crop up in my testing. How did Nicolas see this? The bug
> report I saw didn't look related.
FWIW, we've been hitting this bug with a distribution backport on
ThunderX2 on every boot. Due to bad luck there was a non-zero value
in TTBR1 that crashed the kernel immediately and dropped us to firmware.
--Jan
prev parent reply other threads:[~2018-02-28 10:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-23 18:29 [PATCH -stable] arm64: mm: don't write garbage into TTBR1_EL1 register Ard Biesheuvel
2018-02-23 20:33 ` Nicolas Dechesne
2018-02-24 8:34 ` Greg KH
2018-02-24 8:49 ` Nicolas Dechesne
2018-02-24 8:50 ` Ard Biesheuvel
2018-02-26 11:30 ` Will Deacon
2018-02-26 11:37 ` Ard Biesheuvel
2018-02-28 10:23 ` Jan Glauber [this message]
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