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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-sgx@vger.kernel.org, akpm@linux-foundation.org,
	dave.hansen@intel.com, nhorman@redhat.com, npmccallum@redhat.com,
	serge.ayoun@intel.com, shay.katz-zamir@intel.com,
	haitao.huang@intel.com, andriy.shevchenko@linux.intel.com,
	tglx@linutronix.de, kai.svahn@intel.com, bp@alien8.de,
	josh@joshtriplett.org, luto@kernel.org, kai.huang@intel.com,
	rientjes@google.com, cedric.xing@intel.com,
	puiterwijk@redhat.com, linux-security-module@vger.kernel.org,
	Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: [PATCH v23 12/24] x86/sgx: Linux Enclave Driver
Date: Fri, 8 Nov 2019 10:05:01 +0200
Message-ID: <20191108080501.GA3370@linux.intel.com> (raw)
In-Reply-To: <f3a3d137-a187-9090-f5af-da306ced5371@tycho.nsa.gov>

On Fri, Nov 01, 2019 at 01:16:59PM -0400, Stephen Smalley wrote:
> On 11/1/19 11:32 AM, Sean Christopherson wrote:
> > On Fri, Nov 01, 2019 at 09:28:17AM -0400, Stephen Smalley wrote:
> > > On 11/1/19 9:16 AM, Stephen Smalley wrote:
> > > > So, IIUC, that means that merging the driver will create a regression with
> > > > respect to LSM control over executable mappings that will only be
> > > > rectified at some future point in time if/when someone submits LSM hooks
> > > > or calls to existing hooks to restore such control.  That doesn't seem
> > > > like a good idea.  Why can't you include at least that basic level of
> > > > control now?  It is one thing to defer finer grained control or
> > > > SGX-specific access controls to the future - that I can understand.  But
> > > > introducing a regression in the existing controls is not really ok.
> > > 
> > > Unless you are arguing that the existing checks on mmap/mprotect of
> > > /dev/sgx/enclave are a coarse-grained approximation (effectively requiring
> > > WX to the file or execmem for any user of SGX).
> > 
> > Yes, that's the argument as running any enclave will require RWX access to
> > /dev/sgx/enclave.  EXECMEM won't trigger for SGX users as /dev/sgx/enclave
> > must be MAP_SHARED and it's a non-private file (not backed by anonymous
> > inode, in case I got the file terminology wrong).
> 
> Ok, so for SELinux's purposes, one will need to allow :file { open ioctl map
> read write execute } to whatever type is ultimately assigned to
> /dev/sgx/enclave in order to use SGX.

AFAIK yes.

/Jarkko

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-28 21:03 [PATCH v23 00/24] Intel SGX foundations Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 01/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 02/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 03/24] x86/cpufeatures: x86/msr: Intel SGX Launch Control " Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 04/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 05/24] x86/sgx: Add SGX microarchitectural data structures Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 06/24] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 07/24] x86/cpu/intel: Detect SGX supprt Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 08/24] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 09/24] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 10/24] x86/sgx: Add sgx_einit() for wrapping ENCLS[EINIT] Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 11/24] mm: Introduce vm_ops->may_mprotect() Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 12/24] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2019-10-29  9:29   ` Jarkko Sakkinen
2019-10-30  9:30     ` Sean Christopherson
2019-10-31 21:12       ` Jarkko Sakkinen
2019-11-05 11:11         ` Jarkko Sakkinen
2019-11-08  8:20           ` Jarkko Sakkinen
2019-10-30 13:45   ` Stephen Smalley
2019-10-31 21:17     ` Jarkko Sakkinen
2019-11-01 13:16       ` Stephen Smalley
2019-11-01 13:28         ` Stephen Smalley
2019-11-01 15:32           ` Sean Christopherson
2019-11-01 17:16             ` Stephen Smalley
2019-11-08  8:05               ` Jarkko Sakkinen [this message]
2019-10-28 21:03 ` [PATCH v23 13/24] selftests/x86: Recurse into subdirectories Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 14/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 15/24] x86/sgx: Add provisioning Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 16/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 17/24] x86/sgx: ptrace() support for the SGX driver Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 18/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 19/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 20/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 21/24] x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 22/24] selftests/x86: Add vDSO selftest for SGX Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 23/24] docs: x86/sgx: Document microarchitecture Jarkko Sakkinen
2019-10-28 21:03 ` [PATCH v23 24/24] docs: x86/sgx: Document kernel internals Jarkko Sakkinen

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