linux-kernel - Re: [PATCH 2/2] arm64: add KASan support

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Date:	Wed, 15 Apr 2015 21:04:37 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	David Keitel <dkeitel@...eaurora.org>
Cc:	Catalin Marinas <catalin.marinas@....com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] arm64: add KASan support

On 04/15/2015 05:37 AM, David Keitel wrote:
>>>> +	pgd = __pgd(__pa(kasan_zero_pmd) | PAGE_KERNEL);
>>>> +#else
>>>> +	pgd = __pgd(__pa(kasan_zero_pte) | PAGE_KERNEL);
>>>> +#endif
>>>> +
>>>> +	for (i = pgd_index(start); start < end; i++) {
>>>> +		set_pgd(&pgdp[i], pgd);
>>>> +		start += PGDIR_SIZE;
>>>> +	}
>>>> +}
>>>
>>> Same problem as above with PAGE_KERNEL. You should just use
>>> pgd_populate().
> 
> Any suggestion what the correct flag setting would be here for a 4K mapping?
> 
> I tried fixing this by changing this to pud and setting the PMD_TYPE_TABLE flag for kasan_zero_pmd. However the MMU doesn't like it and I get a first level address translation fault.
> 
> If you have any updated patches to share I'd be glad to try them out.
> 

Sorry, I didn't have much time on work on this yet.

I've pushed the most fresh thing that I have in git:
	git://github.com/aryabinin/linux.git kasan/arm64v1

It's the same patches with two simple but important fixes on top of it.
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