On 17/10/17 15:46, Christoffer Dall wrote:
> On Tue, Oct 17, 2017 at 12:22:08PM +0100, Marc Zyngier wrote:
>> On 16/10/17 21:08, Christoffer Dall wrote:
>>> On Mon, Oct 09, 2017 at 04:20:29PM +0100, Marc Zyngier wrote:
So far, we loose the Exec property whenever we take permission
faults,
On Tue, Oct 17, 2017 at 12:22:08PM +0100, Marc Zyngier wrote:
> On 16/10/17 21:08, Christoffer Dall wrote:
> > On Mon, Oct 09, 2017 at 04:20:29PM +0100, Marc Zyngier wrote:
> >> So far, we loose the Exec property whenever we take permission
> >> faults, as we always reconstruct the PTE/PMD from scr
On 16/10/17 21:08, Christoffer Dall wrote:
> On Mon, Oct 09, 2017 at 04:20:29PM +0100, Marc Zyngier wrote:
>> So far, we loose the Exec property whenever we take permission
>> faults, as we always reconstruct the PTE/PMD from scratch. This
>> can be counter productive as we can end-up with the foll
On Mon, Oct 09, 2017 at 04:20:29PM +0100, Marc Zyngier wrote:
> So far, we loose the Exec property whenever we take permission
> faults, as we always reconstruct the PTE/PMD from scratch. This
> can be counter productive as we can end-up with the following
> fault sequence:
>
> X -> RO -> RO
So far, we loose the Exec property whenever we take permission
faults, as we always reconstruct the PTE/PMD from scratch. This
can be counter productive as we can end-up with the following
fault sequence:
X -> RO -> ROX -> RW -> RWX
Instead, we can lookup the existing PTE/PMD and clear th
