From: Andy Lutomirski <luto@amacapital.net>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Topi Miettinen <toiwoton@gmail.com>,
Jethro Beekman <jethro@fortanix.com>,
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>,
ben@decadent.org.uk
Subject: Re: [PATCH 2/4] x86/sgx: Put enclaves into anonymous files
Date: Mon, 6 Apr 2020 12:53:41 -0700 [thread overview]
Message-ID: <F4B63BCD-F554-4BE2-B3AE-4ADB6C2F4285@amacapital.net> (raw)
In-Reply-To: <20200406185530.GE20105@linux.intel.com>
> On Apr 6, 2020, at 11:55 AM, Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> wrote:
>
> On Mon, Apr 06, 2020 at 09:44:19AM -0700, Andy Lutomirski wrote:
>>
>>>> On Apr 6, 2020, at 4:01 AM, Topi Miettinen <toiwoton@gmail.com> wrote:
>>>
>>> On 6.4.2020 9.42, Jethro Beekman wrote:
>>>> On 2020-04-04 09:27, Topi Miettinen wrote> Then initramfs should make a similar exception as with v86d and grant exec to /dev.
>>>> I'm not sure this is a reasonable approach. Expect most devices with an Intel processor will have the SGX device going forward. Then, no one is using noexec, so why have this logic at all?
>>>
>>> Intel does not control the whole market yet, does AMD also offer SGX or similar? Will SGX be also available for consumer devices? Are distros going to enable SGX, will it benefit their users somehow?
>>>
>>> Perhaps the sgxfs approach or something else (system call?) would be better after all in order to not force exec just because of one device. /dev is usually writable, so allowing exec means breaking the W^X principle for filesystems.
>>>
>>>
>>
>> It’s *possible* to create a tmpfs, create the sgx nodes on it,
>> bind-mount to /dev/sgx/..., and lazy-unmount the tmpfs.
>>
>> I don’t know whether udev would be willing to support such a thing.
>
> sgxfs is somewhat trivial to implement and has one stakeholder less to
> worry about. It is not really a huge stretch.
>
> Overally, I think it is something that we could live with. At least it
> is something that does not step on others toes.
>
> Haitao: If we go with sgxfs route, then you can for the moment do what
> Andy suggested: bind mount it to /dev/sgx.
That also needs userspace support.
I’ll start a thread on the udev list.
>
> /Jarkko
next prev parent reply other threads:[~2020-04-06 19:53 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 [this message]
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
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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