linux-kernel - Re: [PATCH v3 1/5] mm: kasan: introduce generic kasan_populate_zero

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Date:	Wed, 22 Jul 2015 17:34:25 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org,
	Linus Walleij <linus.walleij@...aro.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	David Keitel <dkeitel@...eaurora.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Potapenko <glider@...gle.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v3 1/5] mm: kasan: introduce generic
 kasan_populate_zero_shadow()

On 07/22/2015 05:17 PM, Catalin Marinas wrote:
> On Wed, Jul 22, 2015 at 01:30:33PM +0300, Andrey Ryabinin wrote:
>> diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
>> index e1840f3..2390dba 100644
>> --- a/arch/x86/mm/kasan_init_64.c
>> +++ b/arch/x86/mm/kasan_init_64.c
>> @@ -12,9 +12,9 @@
>>  extern pgd_t early_level4_pgt[PTRS_PER_PGD];
>>  extern struct range pfn_mapped[E820_X_MAX];
>>  
>> -static pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss;
>> -static pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss;
>> -static pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss;
>> +pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss;
>> +pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss;
>> +pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss;
>>  
>>  /*
>>   * This page used as early shadow. We don't use empty_zero_page
>> @@ -24,7 +24,7 @@ static pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss;
>>   * that allowed to access, but not instrumented by kasan
>>   * (vmalloc/vmemmap ...).
>>   */
>> -static unsigned char kasan_zero_page[PAGE_SIZE] __page_aligned_bss;
>> +unsigned char kasan_zero_page[PAGE_SIZE] __page_aligned_bss;
> 
> Did you lose part of the patch when rebasing? I can see you copied
> kasan_populate_zero_shadow() to the mm code but it's still present in
> the x86 one and the above changes to remove static seem meaningless.
> 
> Or you plan to submit the rest of the x86 code separately?
> 

Yes, I was going to send x86 patch later.
Static has to be removed because this conflicts with kasan_zero_p* declarations in include/linux/kasan.h.

> BTW, you could even move kasan_zero_p[tme]d arrays to mm/.
> 

Makes sense.

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