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Date:   Fri, 14 Jun 2019 10:53:39 -0700
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     "Xing, Cedric" <cedric.xing@intel.com>
Cc:     Stephen Smalley <sds@tycho.nsa.gov>,
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Subject: Re: [RFC PATCH v1 2/3] LSM/x86/sgx: Implement SGX specific hooks in
 SELinux
Message-ID: <20190614175339.GA29126@linux.intel.com>
References: <cover.1560131039.git.cedric.xing@intel.com>
 <a382d46f66756e13929ca9244479dd9f689c470e.1560131039.git.cedric.xing@intel.com>
 <b6f099cd-c0eb-d5cf-847d-27a15ac5ceaf@tycho.nsa.gov>
 <20190611220243.GB3416@linux.intel.com>
 <8d99d8fb-a921-286a-8cf0-cd522e09b37c@tycho.nsa.gov>
 <20190614004600.GF18385@linux.intel.com>
 <960B34DE67B9E140824F1DCDEC400C0F65504665@ORSMSX116.amr.corp.intel.com>
 <20190614174556.GJ12191@linux.intel.com>
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On Fri, Jun 14, 2019 at 10:45:56AM -0700, Sean Christopherson wrote:
> The state tracking of #2/#3 doesn't scare me, it's purely the auditing.
> Holding an audit message for an indeterminate amount of time is a
> nightmare.
> 
> Here's a thought.  What if we simply require FILE__EXECUTE or AA_EXEC_MAP
> to load any enclave page from a file?  Alternatively, we could add an SGX
> specific file policity, e.g. FILE__ENCLAVELOAD and AA_MAY_LOAD_ENCLAVE.
> As in my other email, SELinux's W^X restrictions can be tied to the process,
> i.e. they can be checked at mmap()/mprotect() without throwing a wrench in
> auditing.

We would also need to require VM_MAYEXEC on all enclave pages, or forego
enforcing path_noexec() for enclaves.