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SubjectRe: [PATCH 02/23] x86, kaiser: do not set _PAGE_USER for init_mm page tables
On Wed, Nov 1, 2017 at 2:11 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
> On Tue, 31 Oct 2017, Dave Hansen wrote:
>
>>
>> init_mm is for kernel-exclusive use. If someone is allocating page
>> tables in it, do not set _PAGE_USER on them. This ensures that
>> we do *not* set NX on these page tables in the KAISER code.
>
> This changelog is confusing at best.
>
> Why is this a kaiser issue? Nothing should ever create _PAGE_USER entries
> in init_mm, right?

The vsyscall page is _PAGE_USER and lives in init_mm via the fixmap.

--Andy

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