linux-kernel - Re: [PATCH v11 12/13] intel

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Message-ID: <6200618e-bcc8-23ba-afe8-4c6be8b364f0@fortanix.com>
Date:   Fri, 8 Jun 2018 11:32:17 -0700
From:   Jethro Beekman <jethro@...tanix.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, x86@...nel.org,
        platform-driver-x86@...r.kernel.org
Cc:     dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 12/13] intel_sgx: driver documentation

On 2018-06-08 10:09, Jarkko Sakkinen wrote:
> +Launching enclaves
> +------------------
> +
> +For privileged enclaves the launch is performed simply by submitting the
> +SIGSTRUCT for that enclave to ENCLS(EINIT). For unprivileged enclaves the
> +driver hosts a process in ring-3 that hosts a launch enclave signed with a key
> +supplied for kbuild.
> +
> +The current implementation of the launch enclave generates a token for any
> +enclave. In the future it could be potentially extended to have ways to
> +configure policy what can be lauched.
> +
> +The driver will fail to initialize if it cannot start its own launch enclave.
> +A user space application can submit a SIGSTRUCT instance through the ioctl API.
> +The kernel will take care of the rest.
> +
> +This design assures that the Linux kernel has always full control, which
> +enclaves get to launch and which do not, even if the public key MSRs are

As discussed previously at length, since the kernel needs to execute 
ENCLS[EINIT], it has full control to deny the launching of enclaves 
regardless of any launch enclave implementation. Please change this 
misleading statement.

> +read-only. Having launch intrinsics inside the kernel also enables easy
> +development of enclaves without necessarily needing any heavy weight SDK.
> +Having a low-barrier to implement enclaves could make sense for example for
> +system daemons where amount of dependecies ought to be minimized.

--
Jethro Beekman | Fortanix


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