linux-kernel - Re: [PATCH v4 3/6] kasan: print timer and workqueue stack

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Message-ID: <CAG_fn=W2dcGKFKHpDXzNvbPUp3USYyWi2DEpEewboqYBodnSsQ@mail.gmail.com>
Date:   Thu, 24 Sep 2020 13:47:27 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Marco Elver <elver@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4 3/6] kasan: print timer and workqueue stack

On Thu, Sep 24, 2020 at 6:05 AM Walter Wu <walter-zh.wu@...iatek.com> wrote:
>
> The aux_stack[2] is reused to record the call_rcu() call stack,
> timer init call stack, and enqueuing work call stacks. So that
> we need to change the auxiliary stack title for common title,
> print them in KASAN report.
>
> Signed-off-by: Walter Wu <walter-zh.wu@...iatek.com>
> Suggested-by: Marco Elver <elver@...gle.com>
> Acked-by: Marco Elver <elver@...gle.com>
> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
> Reviewed-by: Andrey Konovalov <andreyknvl@...gle.com>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> ---
>
> v2:
> - Thanks for Marco suggestion.
> - We modify aux stack title name in KASAN report
>   in order to print call_rcu()/timer/workqueue stack.
>
> ---
>  mm/kasan/report.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 4f49fa6cd1aa..886809d0a8dd 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -183,12 +183,12 @@ static void describe_object(struct kmem_cache *cache, void *object,
>
>  #ifdef CONFIG_KASAN_GENERIC
>                 if (alloc_info->aux_stack[0]) {
> -                       pr_err("Last call_rcu():\n");
> +                       pr_err("Last potentially related work creation:\n");

This doesn't have to be a work creation (expect more callers of
kasan_record_aux_stack() in the future), so maybe change the wording
here to "Last potentially related auxiliary stack"?