linux-kernel - Re: [PATCH v2] task_work: kasan: record task_work

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Date:   Tue, 16 Mar 2021 18:54:56 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        wsd_upstream <wsd_upstream@...iatek.com>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2] task_work: kasan: record task_work_add() call stack

On 03/16, Walter Wu wrote:
>
> --- a/kernel/task_work.c
> +++ b/kernel/task_work.c
> @@ -34,6 +34,9 @@ int task_work_add(struct task_struct *task, struct callback_head *work,
>  {
>  	struct callback_head *head;
>
> +	/* record the work call stack in order to print it in KASAN reports */
> +	kasan_record_aux_stack(work);
> +
>  	do {
>  		head = READ_ONCE(task->task_works);
>  		if (unlikely(head == &work_exited))

Acked-by: Oleg Nesterov <oleg@...hat.com>