linux-kernel - Re: [PATCH] powerpc/8xx: Fix clearing of bits 20-23 in ITLB miss

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Message-Id: <48My3d1z1Vz9sST@ozlabs.org>
Date:   Wed, 19 Feb 2020 23:39:55 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/8xx: Fix clearing of bits 20-23 in ITLB miss

On Sun, 2020-02-09 at 18:14:42 UTC, Christophe Leroy wrote:
> In ITLB miss handled the line supposed to clear bits 20-23 on the
> L2 ITLB entry is buggy and does indeed nothing, leading to undefined
> value which could allow execution when it shouldn't.
> 
> Properly do the clearing with the relevant instruction.
> 
> Fixes: 74fabcadfd43 ("powerpc/8xx: don't use r12/SPRN_SPRG_SCRATCH2 in TLB Miss handlers")
> Cc: stable@...r.kernel.org
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/a4031afb9d10d97f4d0285844abbc0ab04245304

cheers