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

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Message-ID: <552DCED9.40207@codeaurora.org>
Date:	Tue, 14 Apr 2015 19:37:13 -0700
From:	David Keitel <dkeitel@...eaurora.org>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Catalin Marinas <catalin.marinas@....com>
CC:	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

>>> +	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.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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