linux-kernel - Re: [stable PATCH 1/2] arm64: Fix mismatched cache line size detection

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Message-ID: <20180912193816.GF21563@kroah.com>
Date:   Wed, 12 Sep 2018 21:38:16 +0200
From:   Greg KH <greg@...ah.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     stable@...r.kernel.org, will.deacon@....com, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        catalin.marinas@....com
Subject: Re: [stable PATCH 1/2] arm64: Fix mismatched cache line size
 detection

On Tue, Sep 04, 2018 at 10:10:09AM +0100, Suzuki K Poulose wrote:
> commit 4c4a39dd5fe2d13e2d2fa5fceb8ef95d19fc389a upstream
> 
> If there is a mismatch in the I/D min line size, we must
> always use the system wide safe value both in applications
> and in the kernel, while performing cache operations. However,
> we have been checking more bits than just the min line sizes,
> which triggers false negatives. We may need to trap the user
> accesses in such cases, but not necessarily patch the kernel.
> 
> This patch fixes the check to do the right thing as advertised.
> A new capability will be added to check mismatches in other
> fields and ensure we trap the CTR accesses.
> 
> Fixes: be68a8aaf925 ("arm64: cpufeature: Fix CTR_EL0 field definitions")
> Cc: <stable@...r.kernel.org> # v4.9

Why 4.9?  be68a8aaf925 only showed up in 4.16 and was backported only to
4.14-stable.  Not to 4.9-stable from what I can tell.

thanks,

greg k-h