Re: [PATCH] irq_work: record irq_work_queue() call stack

[Andrey Konovalov]

On Wed, Mar 31, 2021 at 8:32 AM <qiang.zhang@xxxxxxxxxxxxx> wrote:
>
> From: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
>
> Add the irq_work_queue() call stack into the KASAN auxiliary
> stack in order to improve KASAN reports. this will let us know
> where the irq work be queued.
>
> Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
> ---
>  kernel/irq_work.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/irq_work.c b/kernel/irq_work.c
> index e8da1e71583a..23a7a0ba1388 100644
> --- a/kernel/irq_work.c
> +++ b/kernel/irq_work.c
> @@ -19,7 +19,7 @@
>  #include <linux/notifier.h>
>  #include <linux/smp.h>
>  #include <asm/processor.h>
> -
> +#include <linux/kasan.h>
>
>  static DEFINE_PER_CPU(struct llist_head, raised_list);
>  static DEFINE_PER_CPU(struct llist_head, lazy_list);
> @@ -70,6 +70,9 @@ bool irq_work_queue(struct irq_work *work)
>         if (!irq_work_claim(work))
>                 return false;
>
> +       /*record irq_work call stack in order to print it in KASAN reports*/
> +       kasan_record_aux_stack(work);
> +
>         /* Queue the entry and raise the IPI if needed. */
>         preempt_disable();
>         __irq_work_queue_local(work);
> @@ -98,6 +101,8 @@ bool irq_work_queue_on(struct irq_work *work, int cpu)
>         if (!irq_work_claim(work))
>                 return false;
>
> +       kasan_record_aux_stack(work);
> +
>         preempt_disable();
>         if (cpu != smp_processor_id()) {
>                 /* Arch remote IPI send/receive backend aren't NMI safe */
> --
> 2.17.1

Acked-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>