linux-kernel - Re: [PATCH v4 17/18] nitro_enclaves: Add overview documentation

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Message-ID: <20200623085915.GF32718@stefanha-x1.localdomain>
Date:   Tue, 23 Jun 2020 09:59:15 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Andra Paraschiv <andraprs@...zon.com>
Cc:     linux-kernel@...r.kernel.org,
        Anthony Liguori <aliguori@...zon.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        Bjoern Doebel <doebel@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Frank van der Linden <fllinden@...zon.com>,
        Alexander Graf <graf@...zon.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Martin Pohlack <mpohlack@...zon.de>,
        Matt Wilson <msw@...zon.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Balbir Singh <sblbir@...zon.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Stewart Smith <trawets@...zon.com>,
        Uwe Dannowski <uwed@...zon.de>, kvm@...r.kernel.org,
        ne-devel-upstream@...zon.com
Subject: Re: [PATCH v4 17/18] nitro_enclaves: Add overview documentation

On Mon, Jun 22, 2020 at 11:03:28PM +0300, Andra Paraschiv wrote:
> +The kernel bzImage, the kernel command line, the ramdisk(s) are part of the
> +Enclave Image Format (EIF); plus an EIF header including metadata such as magic
> +number, eif version, image size and CRC.
> +
> +Hash values are computed for the entire enclave image (EIF), the kernel and
> +ramdisk(s). That's used, for example, to check that the enclave image that is
> +loaded in the enclave VM is the one that was intended to be run.
> +
> +These crypto measurements are included in a signed attestation document
> +generated by the Nitro Hypervisor and further used to prove the identity of the
> +enclave; KMS is an example of service that NE is integrated with and that checks
> +the attestation doc.
> +
> +The enclave image (EIF) is loaded in the enclave memory at offset 8 MiB. The
> +init process in the enclave connects to the vsock CID of the primary VM and a
> +predefined port - 9000 - to send a heartbeat value - 0xb7. This mechanism is
> +used to check in the primary VM that the enclave has booted.
> +
> +If the enclave VM crashes or gracefully exits, an interrupt event is received by
> +the NE driver. This event is sent further to the user space enclave process
> +running in the primary VM via a poll notification mechanism. Then the user space
> +enclave process can exit.
> +
> +[1] https://aws.amazon.com/ec2/nitro/nitro-enclaves/
> +[2] https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt
> +[3] https://lwn.net/Articles/807108/
> +[4] https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
> +[5] https://man7.org/linux/man-pages/man7/vsock.7.html

Is the EIF specification and the attestation protocol available?

Stefan

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