Re: [PATCH] ARM/mm: Fix stack recursion caused by KASAN

[Linus Walleij]

On Mon, Oct 7, 2024 at 7:25 AM Melon Liu <melon1335@xxxxxxx> wrote:

> When accessing the KASAN shadow area corresponding to the task stack
> which is in vmalloc space, the stack recursion would occur if the area`s
> page tables are unpopulated.
>
> Calltrace:
>  ...
>  __dabt_svc+0x4c/0x80
>  __asan_load4+0x30/0x88
>  do_translation_fault+0x2c/0x110
>  do_DataAbort+0x4c/0xec
>  __dabt_svc+0x4c/0x80
>  __asan_load4+0x30/0x88
>  do_translation_fault+0x2c/0x110
>  do_DataAbort+0x4c/0xec
>  __dabt_svc+0x4c/0x80
>  sched_setscheduler_nocheck+0x60/0x158
>  kthread+0xec/0x198
>  ret_from_fork+0x14/0x28
>
> Fixes: 565cbaad83d ("ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC")
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Melon Liu <melon1335@xxxxxxx>

Patch looks correct to me:
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Can you put the patch into Russell's patch tracker after some
time for review, if no issues are found, please?

Yours,
Linus Walleij