Re: [PATCH v38 10/24] mm: Add vm_ops->mprotect()

[Borislav Petkov]

On Tue, Sep 15, 2020 at 02:28:28PM +0300, Jarkko Sakkinen wrote:
> From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> 
> Add vm_ops()->mprotect() for additional constraints for a VMA.
> 
> Intel Software Guard eXtensions (SGX) will use this callback to add two
> constraints:
> 
> 1. Verify that the address range does not have holes: each page address
>    must be filled with an enclave page.
> 2. Verify that VMA permissions won't surpass the permissions of any enclave
>    page within the address range. Enclave cryptographically sealed
>    permissions for each page address that set the upper limit for possible
>    VMA permissions. Not respecting this can cause #GP's to be emitted.
> 
> Cc: linux-mm@xxxxxxxxx
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Acked-by: Jethro Beekman <jethro@xxxxxxxxxxxx>
> Reviewed-by: Darren Kenny <darren.kenny@xxxxxxxxxx>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> Co-developed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
> ---
>  include/linux/mm.h | 3 +++
>  mm/mprotect.c      | 5 ++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)

Needs an ACK from an mm person.

-- 
Regards/Gruss,
    Boris.

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