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

[Melon Liu]

On Mon, Oct 07, 2024 at 12:25:38PM +0200, Linus Walleij wrote:
> On Mon, Oct 7, 2024 at 7:25 AM Melon Liu <melon1335 at 163.com> 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 at vger.kernel.org>
> > Signed-off-by: Melon Liu <melon1335 at 163.org>
> 
> Patch looks correct to me:
> Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
> 
> Can you put the patch into Russell's patch tracker after some
> time for review, if no issues are found, please?
Ok.

Thanks!
> 
> Yours,
> Linus Walleij