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

From: [email-masked] (Laura Abbott)
Date: Mon, 16 Nov 2015 14:50:48 -0800

On 11/14/2015 11:38 PM, Ard Biesheuvel wrote:
> On 12 November 2015 at 21:21, Laura Abbott <[email-masked]> 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 <[email-masked]>
>
> Acked-by: Ard Biesheuvel <[email-masked]>
>

Thanks,
Laura