linux-kernel - Re: [PATCH 24/26] perf tools: Add buildid-list --store option

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Message-ID: <20200914204255.GX1714160@krava>
Date:   Mon, 14 Sep 2020 22:42:55 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 24/26] perf tools: Add buildid-list --store option

On Mon, Sep 14, 2020 at 03:42:55PM +0900, Namhyung Kim wrote:
> On Mon, Sep 14, 2020 at 6:05 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding buildid-list --store option to populate
> > .debug data with build id files.
> 
> Hmm.. isn't it better to add it to the buildid-cache command?
> > +        *   - store binary to build id database
> > +        */
> > +       is_kallsyms = !strcmp(machine->mmap_name, dso->short_name);
> > +       build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
> > +
> > +       if (is_kallsyms) {
> > +               /*
> > +                * Find out if we are on the same kernel as perf.data
> > +                * and keel kallsyms in that case.
> > +                */
> > +               path = strdup(dso->long_name);
> > +               if (!path)
> > +                       goto out_err;
> > +
> > +               err = sysfs__read_build_id("/sys/kernel/notes", &bid, sizeof(bid));
> > +               if (err < 0)
> > +                       goto out_err;
> > +       } else {
> > +               struct stat st;
> > +
> > +               /*
> > +                * Does the file exists in the first place, if it does,
> > +                * resolve path and read the build id.
> > +                */
> > +               if (stat(dso->long_name, &st)) {
> > +                       zfree(&path);
> > +                       goto try_download;
> > +               }
> > +
> > +               path = nsinfo__realpath(dso->long_name, dso->nsinfo);
> > +               if (!path)
> > +                       goto out_err;
> > +
> > +               err = filename__read_build_id(path, &bid, sizeof(bid));
> 
> Is it ok to read the file out of the namespace?

right, I need to enclose the whole part into nsinfo__mountns_* 

thanks,
jirka