linux-kernel - Re: [PATCH v2 35/37] kasan, slub: reset tags when accessing metadata

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Message-ID: <CAAeHK+yJ=86KfVN5bSvXpawjNtLuG4zvsPVtcYCBQR_PPfV4Bw@mail.gmail.com>
Date:   Fri, 18 Sep 2020 16:55:45 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 35/37] kasan, slub: reset tags when accessing metadata

On Fri, Sep 18, 2020 at 4:44 PM Marco Elver <elver@...gle.com> wrote:
>
> On Tue, Sep 15, 2020 at 11:16PM +0200, Andrey Konovalov wrote:
> [...]
> >  static void set_track(struct kmem_cache *s, void *object,
> > @@ -583,7 +585,8 @@ static void set_track(struct kmem_cache *s, void *object,
> >               unsigned int nr_entries;
> >
> >               metadata_access_enable();
> > -             nr_entries = stack_trace_save(p->addrs, TRACK_ADDRS_COUNT, 3);
> > +             nr_entries = stack_trace_save(kasan_reset_tag(p->addrs),
> > +                                             TRACK_ADDRS_COUNT, 3);
>
> Suggested edit (below 100 cols):
>
> -               nr_entries = stack_trace_save(kasan_reset_tag(p->addrs),
> -                                               TRACK_ADDRS_COUNT, 3);
> +               nr_entries = stack_trace_save(kasan_reset_tag(p->addrs), TRACK_ADDRS_COUNT, 3);
>

Ah, yes, it's a 100 lines now :) Will do in v3, thanks!