linux-kernel - Re: [Stable-5.4][PATCH 0/3] arm64: Allow the compat vdso to be disabled at runtime

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Date:   Fri, 17 Jul 2020 11:33:57 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     stable@...r.kernel.org, arnd@...db.de, sashal@...nel.org,
        naresh.kamboju@...aro.org, Mark Rutland <mark.rutland@....com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [Stable-5.4][PATCH 0/3] arm64: Allow the compat vdso to be
 disabled at runtime

On Fri, Jul 17, 2020 at 09:02:06AM +0100, Marc Zyngier wrote:
> Hi Greg,
> 
> On 2020-07-16 12:58, Greg KH wrote:
> > On Wed, Jul 15, 2020 at 01:56:11PM +0100, Marc Zyngier wrote:
> > > This is a backport of the series that recently went into 5.8. Note
> > > that the first patch is more a complete rewriting than a backport, as
> > > the vdso implementation in 5.4 doesn't have much in common with
> > > mainline. This affects the 32bit arch code in a benign way.
> > > 
> > > It has seen very little testing, as I don't have the HW that triggers
> > > this issue. I have run it in VMs by faking the CPU MIDR, and nothing
> > > caught fire. Famous last words.
> > 
> > These are also needed in 5.7.y, right?  If so, I need that series before
> > I can take this one as we don't want people moving to a newer kernel and
> > suffer regressions :(
> 
> The original mainline changes:
> 
> 4b661d6133c5 arm64: arch_timer: Disable the compat vdso for cores affected
> by ARM64_WORKAROUND_1418040
> c1fbec4ac0d7 arm64: arch_timer: Allow an workaround descriptor to disable
> compat vdso
> 97884ca8c292 arm64: Introduce a way to disable the 32bit vdso
> 
> do apply cleanly to stable-5.7. Do you want me to resend them separately,
> or will you pick the patches directly from mainline?

Hm, cherry-pick seems to work due to file renames, let me try this
again...