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

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Message-ID: <20200918144423.GF2384246@elver.google.com>
Date:   Fri, 18 Sep 2020 16:44:23 +0200
From:   Marco Elver <elver@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        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-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 35/37] kasan, slub: reset tags when accessing metadata

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);