[PATCHv2] arm64: Fix R/O permissions in mark_rodata_ro

Laura Abbott labbott at redhat.com
Mon Nov 16 14:50:48 PST 2015

On 11/14/2015 11:38 PM, Ard Biesheuvel wrote:
> On 12 November 2015 at 21:21, Laura Abbott <labbott at fedoraproject.org> wrote:
>> The permissions in mark_rodata_ro trigger a build error
>> with STRICT_MM_TYPECHECKS. Fix this by introducing
>> PAGE_KERNEL_ROX for the same reasons as PAGE_KERNEL_RO.
> Forgive the bikeshedding but perhaps PAGE_KERNEL_EXEC_RO is more consistent?

powerpc was using PAGE_KERNEL_ROX so I went with that. Blame powerpc ;)
>>  From Ard:
>> "PAGE_KERNEL_EXEC has PTE_WRITE set as well, making the range
>> writeable under the ARMv8.1 DBM feature, that manages the
>> dirty bit in hardware (writing to a page with the PTE_RDONLY
>> and PTE_WRITE bits both set will clear the PTE_RDONLY bit in that case)"
>> Signed-off-by: Laura Abbott <labbott at fedoraproject.org>
> Acked-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>


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