linux-kernel - Re: [PATCH v1] perf intel-pt: pkt-decoder: Fix alignment issues

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Date:   Tue, 10 Oct 2023 23:50:25 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
        Liam Howlett <liam.howlett@...cle.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1] perf intel-pt: pkt-decoder: Fix alignment issues

On Tue, Oct 10, 2023 at 10:56 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> On Mon, Oct 9, 2023 at 8:31 AM Ian Rogers <irogers@...gle.com> wrote:
> >
> > On Sun, Oct 8, 2023 at 10:29 PM Namhyung Kim <namhyung@...nel.org> wrote:
> > >
> > > On Thu, Oct 5, 2023 at 2:24 PM Ian Rogers <irogers@...gle.com> wrote:
> > > >
> > > > On Thu, Oct 5, 2023 at 12:06 PM Adrian Hunter <adrian.hunter@...el.com> wrote:
> > > > >
> > > > > On 5/10/23 18:48, Ian Rogers wrote:
> > > > > > On Mon, Oct 2, 2023 at 3:19 PM Ian Rogers <irogers@...gle.com> wrote:
> > > > > >>
> > > > > >> The byte aligned buffer is cast to large types and dereferenced
> > > > > >> causing misaligned pointer warnings from undefined behavior sanitizer.
> > > > > >> Fix the alignment issues with memcpy which may require the
> > > > > >> introduction of temporaries.
> > > > > >>
> > > > > >> Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > > > >> ---
> > > > > >
> > > > > > This is a relatively small change that fixes building with
> > > > > > -fsanitize=alignment -fsanitize-undefined-trap-on-error. Adrian, as
> > > > > > this is Intel-PT could you take a look?
> > > > >
> > > > > Thanks! This has been down my list of things to do for ages,
> > > > > but using get_unaligned_le16() etc seems nicer.  I sent a patch
> > > > > set for that.
> > > >
> > > > Thanks Adrian! Your patch set looks good and I think after Arnaldo's
> > > > comment is addressed we should go with it.
> > >
> > > I think it can be done as a later step as long as the interface is the
> > > same.  Can I add your Ack's to the Adrian's patchset?
> >
> > I think addressing Arnaldo's comment:
> > https://lore.kernel.org/lkml/ZR8QnasisGEsaaDR@kernel.org/
> > will need some changes to the patch series, and so I was waiting to
> > see the outcome of that.
>
> It seems it's done without further changes.  Can I get your Ack's now?

With the unaligned.h patch on its own, I think patch 1 of 5 needs
dropping. For the rest I'm happy to acked-by.

Thanks,
Ian

> Thanks,
> Namhyung