linux-kernel - Re: SGX vs LSM (Re: [PATCH v20 00/28] Intel SGX1 support)

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Date:   Tue, 21 May 2019 18:19:37 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>, selinux@...r.kernel.org,
        Jethro Beekman <jethro@...tanix.com>,
        "Xing, Cedric" <cedric.xing@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Dr. Greg" <greg@...ellic.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "Ayoun, Serge" <serge.ayoun@...el.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Svahn, Kai" <kai.svahn@...el.com>, Borislav Petkov <bp@...en8.de>,
        Josh Triplett <josh@...htriplett.org>,
        "Huang, Kai" <kai.huang@...el.com>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: SGX vs LSM (Re: [PATCH v20 00/28] Intel SGX1 support)

On Mon, May 20, 2019 at 02:41:05PM +0300, Jarkko Sakkinen wrote:
> On Thu, May 16, 2019 at 05:26:15PM -0700, Andy Lutomirski wrote:
> > Is userspace actually requred to mmap() the enclave prior to EADDing things?
> 
> Nope, not since v20. Here is what I wrote about API to the kernel
> documentation:
> 
> "The enclave life-cycle starts by opening `/dev/sgx/enclave`. After this
> there is already a data structure inside kernel tracking the enclave
> that is initially uncreated. After this a set of ioctl's can be used to
> create, populate and initialize the enclave.
> 
> You can close (if you want) the fd after you've mmap()'d. As long as the
> file is open the enclave stays alive so you might want to do that after
> you don't need it anymore. Even munmap() won't destruct the enclave if
> the file is open.  Neither will closing the fd as long as you have
> mmap() done over the fd (even if it does not across the range defined in
> SECS)."
> 
> Enclave can be created and initialized without doing a single mmap()
> call.

We could even disallow mmap() before EINIT done. The way enclave
management internally works right now is quite robust and completely
detached from requiring process address space for anything.

/Jarkko