linux-kernel - Re: [RFC PATCH 1/1] arm64: implement live patching

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Message-ID: <YL4aZCMmouLCQlJr@redhat.com>
Date:   Mon, 7 Jun 2021 09:08:52 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Suraj Jitindar Singh <surajjs@...zon.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org, catalin.marinas@....com,
        will@...nel.org, broonie@...nel.org, madvenka@...ux.microsoft.com,
        duwe@....de, sjitindarsingh@...il.com, benh@...nel.crashing.org
Subject: Re: [RFC PATCH 1/1] arm64: implement live patching

On Mon, Jun 07, 2021 at 11:20:58AM +0100, Mark Rutland wrote:
> On Fri, Jun 04, 2021 at 04:59:30PM -0700, Suraj Jitindar Singh wrote:
> > It's my understanding that the two pieces of work required to enable live
> > patching on arm are in flight upstream;
> > - Reliable stack traces as implemented by Madhavan T. Venkataraman [1]
> > - Objtool as implemented by Julien Thierry [2]
> 
> We also need to rework the arm64 patching code to not rely on any code
> which may itself be patched. Currently there's a reasonable amount of
> patching code that can either be patched directly, or can be
> instrumented by code that can be patched.
> 
> I have some WIP patches for that at:
> 
>   https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=arm64/patching/rework
> 
> ... but there's still a lot to do, and it's not clear to me if there's
> other stuff we need to rework to make patch-safe.
> 
> Do we have any infrastructure for testing LIVEPATCH?
> 

Hi Mark,

If you're looking for a high level sanity check, there are livepatching
integration selftests in tools/testing/selftests/livepatch.  Let me know
if you have any questions about those.

Regards,

-- Joe