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SubjectRe: [PATCH] powerpc/32: disable KASAN with pages bigger than 16k
Date
Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> Le 28/05/2020 à 12:17, Christophe Leroy a écrit :
>> Mapping of early shadow area is implemented by using a single static
>> page table having all entries pointing to the same early shadow page.
>> The shadow area must therefore occupy full PGD entries.
>>
>> The shadow area has a size of 128Mbytes starting at 0xf8000000.
>> With 4k pages, a PGD entry is 4Mbytes
>> With 16k pages, a PGD entry is 64Mbytes
>> With 64k pages, a PGD entry is 256Mbytes which is too big.
>
> That's for 32k pages that a PGD is 256Mbytes.
>
> With 64k pages, a PGD entry is 1Gbytes which is too big.
>
> Michael, can you fix the commit log ?

Yes.

powerpc/32: Disable KASAN with pages bigger than 16k

Mapping of early shadow area is implemented by using a single static
page table having all entries pointing to the same early shadow page.
The shadow area must therefore occupy full PGD entries.

The shadow area has a size of 128MB starting at 0xf8000000.
With 4k pages, a PGD entry is 4MB
With 16k pages, a PGD entry is 64MB
With 64k pages, a PGD entry is 1GB which is too big.

Until we rework the early shadow mapping, disable KASAN when the page
size is too big.

Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support")
Cc: stable@vger.kernel.org # v5.2+
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7195fcde7314ccbf7a081b356084a69d421b10d4.1590660977.git.christophe.leroy@csgroup.eu


cheers

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