From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Casey Schaufler <casey@schaufler-ca.com>,
Andy Lutomirski <luto@kernel.org>,
casey.schaufler@intel.com,
Sean Christopherson <sean.j.christopherson@intel.com>,
linux-sgx@vger.kernel.org, "Svahn, Kai" <kai.svahn@intel.com>,
"Schlobohm, Bruce" <bruce.schlobohm@intel.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Haitao Huang <haitao.huang@linux.intel.com>
Subject: Re: [PATCH 2/4] x86/sgx: Put enclaves into anonymous files
Date: Sat, 4 Apr 2020 12:22:46 +0300 [thread overview]
Message-ID: <20200404092246.GB306326@linux.intel.com> (raw)
In-Reply-To: <F117745A-E01B-499E-B9E4-201C1C08258D@amacapital.net>
On Fri, Apr 03, 2020 at 08:54:40PM -0700, Andy Lutomirski wrote:
>
>
> > On Apr 3, 2020, at 3:08 PM, Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> wrote:
> >
> > On Fri, Apr 03, 2020 at 08:50:08AM -0700, Casey Schaufler wrote:
> >>> How does smackfs interact with namespaces?
> >>
> >> Smack attributes are global. Aside from privilege issues, namespaces
> >> ignore and are ignored by Smack.
> >
> > Okay.
> >
> > For SGX, I foresee things as:
> >
> > 1. Existing files are global.
> > 2. If a policy of any kind is ever added it needs to be *per container*.
> > I'm not sure whether PID or user namespace is the right choice here,
> > but does not matter right now as the feature is not in the queue.
> >
> > To summarize:
> >
> > 1. We have a heterogeneous set of files (i.e. 'enclave' and 'provision'
> > are not "different sames").
> > 2. The files probably will have heterogeneous visibility requirements.
> >
> > I think based on these premises own file system would be a more decent
> > choice than populating /dev. Beside, SGX hasn't been a driver for a
> > while.
> >
> > Andy, what do you think of this?
>
> Probably okay. There are two semantic questions you’ll have to address, though:
>
> - What happens if you mount sgxfs twice? Do you get two copies that can diverge from each other, or do you get two views of the same thing?
>
> - Can it be instantiated from outside the root initns?
>
> It’s certainly conceptually simpler to stick with device nodes. Why exactly is Ubuntu noexecing /dev?
I'm retreating this given that we have reasonable means to drive
exception to the /dev configuration.
Thanks Jethro for helping with this one!
/Jarkko
next prev parent reply other threads:[~2020-04-04 9:22 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-31 11:44 [PATCH 0/4] Migrate enclave mapping to an anonymous inode Jarkko Sakkinen
2020-03-31 11:44 ` [PATCH 1/4] x86/sgx: Remove PROT_NONE branch from sgx_encl_may_map() Jarkko Sakkinen
2020-03-31 11:44 ` [PATCH 2/4] x86/sgx: Put enclaves into anonymous files Jarkko Sakkinen
2020-03-31 17:39 ` Andy Lutomirski
2020-04-01 0:24 ` Sean Christopherson
2020-04-02 21:41 ` Andy Lutomirski
2020-04-03 6:56 ` Jarkko Sakkinen
2020-04-03 6:59 ` Jarkko Sakkinen
2020-04-03 14:35 ` Casey Schaufler
2020-04-03 15:30 ` Jarkko Sakkinen
2020-04-03 15:50 ` Casey Schaufler
2020-04-03 22:08 ` Jarkko Sakkinen
2020-04-04 3:54 ` Andy Lutomirski
2020-04-04 5:46 ` Jethro Beekman
2020-04-04 7:27 ` Topi Miettinen
2020-04-04 9:20 ` Jarkko Sakkinen
2020-04-06 6:42 ` Jethro Beekman
2020-04-06 11:01 ` Topi Miettinen
2020-04-06 16:44 ` Andy Lutomirski
2020-04-06 17:17 ` Jethro Beekman
2020-04-06 18:55 ` Jarkko Sakkinen
2020-04-06 19:01 ` Jarkko Sakkinen
2020-04-06 19:53 ` Andy Lutomirski
2020-04-06 21:24 ` Jarkko Sakkinen
2020-04-06 23:18 ` Andy Lutomirski
2020-04-06 23:48 ` Jarkko Sakkinen
2020-04-07 7:15 ` Jethro Beekman
2020-04-07 8:48 ` Topi Miettinen
2020-04-07 16:52 ` Jarkko Sakkinen
2020-04-07 9:04 ` Topi Miettinen
2020-04-07 16:57 ` Jarkko Sakkinen
2020-04-07 16:59 ` Jarkko Sakkinen
2020-04-07 18:04 ` Jarkko Sakkinen
2020-04-07 19:54 ` Topi Miettinen
2020-04-08 13:40 ` Jarkko Sakkinen
2020-04-08 14:56 ` Sean Christopherson
2020-04-09 18:39 ` Jarkko Sakkinen
2020-04-08 21:15 ` Topi Miettinen
2020-04-08 21:29 ` Sean Christopherson
2020-11-19 7:23 ` Jethro Beekman
2020-11-19 16:09 ` Andy Lutomirski
2020-04-06 18:47 ` Jarkko Sakkinen
2020-04-04 9:22 ` Jarkko Sakkinen [this message]
2020-04-01 8:45 ` Jarkko Sakkinen
2020-03-31 11:44 ` [PATCH 3/4] x86/sgx: Move mmap() to the anonymous enclave file Jarkko Sakkinen
2020-03-31 11:44 ` [PATCH 4/4] x86/sgx: Hand over the enclave file to the user space Jarkko Sakkinen
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