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Date:   Fri, 17 May 2019 10:50:36 -0700
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Stephen Smalley <sds@tycho.nsa.gov>
Cc:     "Xing, Cedric" <cedric.xing@intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        James Morris <jmorris@namei.org>,
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        LSM List <linux-security-module@vger.kernel.org>,
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        Eric Paris <eparis@parisplace.org>,
        "selinux@vger.kernel.org" <selinux@vger.kernel.org>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Jethro Beekman <jethro@fortanix.com>,
        "Hansen, Dave" <dave.hansen@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "Dr. Greg" <greg@enjellic.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
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        "Ayoun, Serge" <serge.ayoun@intel.com>,
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        "Huang, Haitao" <haitao.huang@intel.com>,
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        Josh Triplett <josh@joshtriplett.org>,
        "Huang, Kai" <kai.huang@intel.com>,
        David Rientjes <rientjes@google.com>
Subject: Re: SGX vs LSM (Re: [PATCH v20 00/28] Intel SGX1 support)
Message-ID: <20190517175036.GD15006@linux.intel.com>
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On Fri, May 17, 2019 at 01:42:50PM -0400, Stephen Smalley wrote:
> On 5/17/19 1:29 PM, Sean Christopherson wrote:
> >AIUI, having FILE__WRITE and FILE__EXECUTE on /dev/sgx/enclave would allow
> >*any* enclave/process to map EPC as RWX.  Moving to anon inodes and thus
> >PROCESS__EXECMEM achieves per-process granularity.
> >
> 
> No, FILE__WRITE and FILE__EXECUTE are a check between a process and a file,
> so you can ensure that only whitelisted processes are allowed both to
> /dev/sgx/enclave.

Ah, so each process has its own FILE__* permissions for a specific set of
files?

Does that allow differentiating between a process making an EPC page RWX
and a process making two separate EPC pages RW and RX?