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Date:   Fri, 18 Sep 2020 14:44:45 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc:     x86@kernel.org, linux-sgx@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Matthew Wilcox <willy@infradead.org>,
        Jethro Beekman <jethro@fortanix.com>,
        Darren Kenny <darren.kenny@oracle.com>,
        andriy.shevchenko@linux.intel.com, asapek@google.com,
        cedric.xing@intel.com, chenalexchen@google.com,
        conradparker@google.com, cyhanish@google.com,
        dave.hansen@intel.com, haitao.huang@intel.com,
        josh@joshtriplett.org, kai.huang@intel.com, kai.svahn@intel.com,
        kmoy@google.com, ludloff@google.com, luto@kernel.org,
        nhorman@redhat.com, npmccallum@redhat.com, puiterwijk@redhat.com,
        rientjes@google.com, tglx@linutronix.de, yaozhangx@google.com
Subject: Re: [PATCH v38 10/24] mm: Add vm_ops->mprotect()
Message-ID: <20200918124445.GE6585@zn.tnic>
References: <20200915112842.897265-1-jarkko.sakkinen@linux.intel.com>
 <20200915112842.897265-11-jarkko.sakkinen@linux.intel.com>
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In-Reply-To: <20200915112842.897265-11-jarkko.sakkinen@linux.intel.com>
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On Tue, Sep 15, 2020 at 02:28:28PM +0300, Jarkko Sakkinen wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
> 
> 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@kvack.org
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Matthew Wilcox <willy@infradead.org>
> Acked-by: Jethro Beekman <jethro@fortanix.com>
> Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Co-developed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
>  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.

https://people.kernel.org/tglx/notes-about-netiquette