From: Andy Lutomirski <luto@amacapital.net>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Jethro Beekman <jethro@fortanix.com>,
Jarkko Sakkinen <jarkko.sakkinen@linux.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,
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,
Haitao Huang <haitao.huang@linux.intel.com>
Subject: Re: [PATCH v26 10/22] x86/sgx: Linux Enclave Driver
Date: Fri, 14 Feb 2020 09:40:00 -0800 [thread overview]
Message-ID: <D18DD438-2458-4264-9D56-A05EB84BB545@amacapital.net> (raw)
In-Reply-To: <20200214171146.GD20690@linux.intel.com>
> On Feb 14, 2020, at 9:11 AM, Sean Christopherson <sean.j.christopherson@intel.com> wrote:
>
> On Fri, Feb 14, 2020 at 10:24:10AM +0100, Jethro Beekman wrote:
>>> On 2020-02-13 19:07, Sean Christopherson wrote:
>>> On Thu, Feb 13, 2020 at 02:59:52PM +0100, Jethro Beekman wrote:
>>>> On 2020-02-09 22:25, Jarkko Sakkinen wrote:
>>>>> +/**
>>>>> + * struct sgx_enclave_add_pages - parameter structure for the
>>>>> + * %SGX_IOC_ENCLAVE_ADD_PAGE ioctl
>>>>> + * @src: start address for the page data
>>>>> + * @offset: starting page offset
>>>>> + * @length: length of the data (multiple of the page size)
>>>>> + * @secinfo: address for the SECINFO data
>>>>> + * @flags: page control flags
>>>>> + * @count: number of bytes added (multiple of the page size)
>>>>> + */
>>>>> +struct sgx_enclave_add_pages {
>>>>> + __u64 src;
>>>>> + __u64 offset;
>>>>> + __u64 length;
>>>>> + __u64 secinfo;
>>>>> + __u64 flags;
>>>>> + __u64 count;
>>>>> +};
>>>>
>>>> Compared to the last time I looked at the patch set, this API removes the
>>>> ability to measure individual pages chunks. That is not acceptable.
>>>
>>> Why is it not acceptable? E.g. what specific use case do you have that
>>> _requires_ on measuring partial 4k pages of an enclave?
>>
>> The use case is someone gives me an enclave and I want to load it. If I don't
>> load it exactly as the enclave author specified, the enclave hash will be
>> different, and it won't work.
>
> And if our ABI says "thou shall measure in 4k chunks", then it's an invalid
> enclave if its author generated MRENCLAVE using a different granularity.
ISTM, unless there’s a particularly compelling reason, if an enclave is valid, we should be able to load it.
next prev parent reply other threads:[~2020-02-14 17:40 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200209212609.7928-1-jarkko.sakkinen@linux.intel.com>
2020-02-09 21:25 ` [PATCH v26 10/22] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2020-02-13 13:59 ` Jethro Beekman
2020-02-13 18:07 ` Sean Christopherson
2020-02-14 9:24 ` Jethro Beekman
2020-02-14 17:11 ` Sean Christopherson
2020-02-14 17:40 ` Andy Lutomirski [this message]
2020-02-14 17:52 ` Sean Christopherson
2020-02-15 16:56 ` Andy Lutomirski
2020-02-18 22:12 ` Sean Christopherson
2020-02-15 18:05 ` Dr. Greg
2020-02-15 7:32 ` Jarkko Sakkinen
2020-02-15 7:35 ` Jarkko Sakkinen
2020-02-19 3:26 ` Jordan Hand
2020-02-20 18:13 ` Sean Christopherson
2020-02-20 18:33 ` Jordan Hand
2020-02-20 18:48 ` Sean Christopherson
2020-02-20 22:16 ` Jarkko Sakkinen
2020-02-21 0:11 ` Jordan Hand
2020-02-21 12:53 ` Jarkko Sakkinen
2020-02-21 0:32 ` Andy Lutomirski
2020-02-21 13:01 ` Jarkko Sakkinen
2020-02-20 18:51 ` Andy Lutomirski
2020-02-20 19:15 ` Sean Christopherson
2020-02-20 22:10 ` Jarkko Sakkinen
2020-02-09 21:26 ` [PATCH v26 13/22] x86/sgx: Add provisioning Jarkko Sakkinen
2020-02-13 10:49 ` Jethro Beekman
2020-02-15 7:25 ` Jarkko Sakkinen
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