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

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Message-ID: <CACRpkdZwmjerZSL+Qxc1_M3ywGPRJAYJCFX7_dfEknDiKtuP8w@mail.gmail.com>
Date: Mon, 7 Oct 2024 12:25:38 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Melon Liu <melon1335@....com>
Cc: linux@...linux.org.uk, lecopzer.chen@...iatek.com, 
	linux-arm-kernel@...ts.infradead.org, kasan-dev@...glegroups.com, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] ARM/mm: Fix stack recursion caused by KASAN

On Mon, Oct 7, 2024 at 7:25 AM Melon Liu <melon1335@....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@...r.kernel.org>
> Signed-off-by: Melon Liu <melon1335@....org>

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

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

Yours,
Linus Walleij