Re: [PATCH v3 5/6] Initialize the mapping of KASan shadow memory

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To: Abbott Liu <liuwenliang@xxxxxxxxxx>
Subject: Re: [PATCH v3 5/6] Initialize the mapping of KASan shadow memory
From: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>
Date: Mon, 2 Apr 2018 14:08:13 -0400 (EDT)
Cc: aryabinin@xxxxxxxxxxxxx, dvyukov@xxxxxxxxxx, Jonathan Corbet <corbet@xxxxxxx>, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>, christoffer.dall@xxxxxxxxxx, marc.zyngier@xxxxxxx, kstewart@xxxxxxxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, f.fainelli@xxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, linux@xxxxxxxxxxxxxxxxxx, mawilcox@xxxxxxxxxxxxx, pombredanne@xxxxxxxx, ard.biesheuvel@xxxxxxxxxx, vladimir.murzin@xxxxxxx, alexander.levin@xxxxxxxxxxx, tglx@xxxxxxxxxxxxx, thgarnie@xxxxxxxxxx, dhowells@xxxxxxxxxx, keescook@xxxxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, geert@xxxxxxxxxxxxxx, tixy@xxxxxxxxxx, julien.thierry@xxxxxxx, mark.rutland@xxxxxxx, james.morse@xxxxxxx, zhichao.huang@xxxxxxxxxx, jinb.park7@xxxxxxxxx, labbott@xxxxxxxxxx, philip@cog.systems, grygorii.strashko@xxxxxxxxxx, Catalin Marinas <catalin.marinas@xxxxxxx>, opendmb@xxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, kasan-dev@xxxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <20180402120440.31900-6-liuwenliang@huawei.com>
References: <20180402120440.31900-1-liuwenliang@huawei.com> <20180402120440.31900-6-liuwenliang@huawei.com>
User-agent: Alpine 2.21 (LFD 202 2017-01-01)

On Mon, 2 Apr 2018, Abbott Liu wrote:

> index c79b829..20161e2 100644
> --- a/arch/arm/kernel/head-common.S
> +++ b/arch/arm/kernel/head-common.S
> @@ -115,6 +115,9 @@ __mmap_switched:
>  	str	r8, [r2]			@ Save atags pointer
>  	cmp	r3, #0
>  	strne	r10, [r3]			@ Save control register values
> +#ifdef CONFIG_KASAN
> +	bl	kasan_early_init
> +#endif
>  	mov	lr, #0
>  	b	start_kernel
>  ENDPROC(__mmap_switched)

Would be better if lr was cleared before calling kasan_early_init.


Nicolas

Follow-Ups:
- Re: [PATCH v3 5/6] Initialize the mapping of KASan shadow memory
  - From: Russell King - ARM Linux

References:
- [PATCH v3 0/6] KASan for arm
  - From: Abbott Liu
- [PATCH v3 5/6] Initialize the mapping of KASan shadow memory
  - From: Abbott Liu

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