From: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Jarkko Sakkinen <jarkko@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <seanjc@google.com>,
Shuah Khan <shuah@kernel.org>, X86 ML <x86@kernel.org>,
linux-sgx@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Jia Zhang <zhang.jia@linux.alibaba.com>
Subject: Re: [PATCH] selftests/sgx: fix EINIT failure dueto SGX_INVALID_SIGNATURE
Date: Wed, 3 Mar 2021 20:03:10 +0800 [thread overview]
Message-ID: <870e9a2e-65dd-131d-78c2-24de1ffffd31@linux.alibaba.com> (raw)
In-Reply-To: <CALCETrVn_inXAULfsPrCXeHUTBet+KnL1XsxuiaR+jgG1uTJNg@mail.gmail.com>
On 3/2/21 1:54 PM, Andy Lutomirski wrote:
> On Mon, Mar 1, 2021 at 9:06 PM Tianjia Zhang
> <tianjia.zhang@linux.alibaba.com> wrote:
>>
>>
>>
>> On 3/1/21 5:54 PM, Jarkko Sakkinen wrote:
>>> On Mon, Mar 01, 2021 at 01:18:36PM +0800, Tianjia Zhang wrote:
>>>> q2 is not always 384-byte length. Sometimes it only has 383-byte.
>>>
>>> What does determine this?
>>>
>>>> In this case, the valid portion of q2 is reordered reversely for
>>>> little endian order, and the remaining portion is filled with zero.
>>>
>>> I'm presuming that you want to say "In this case, q2 needs to be reversed because...".
>>>
>>> I'm lacking these details:
>>>
>>> 1. Why the length of Q2 can vary?
>>> 2. Why reversing the bytes is the correct measure to counter-measure
>>> this variation?
>>>
>>> /Jarkko
>>>
>>
>> When use openssl to generate a key instead of using the built-in
>> sign_key.pem, there is a probability that will encounter this problem.
>>
>> Here is a problematic key I encountered. The calculated q1 and q2 of
>> this key are both 383 bytes, If the length is not processed, the
>> hardware signature will fail.
>
> Presumably the issue is that some keys have parameters that have
> enough leading 0 bits to be effectively shorter. The openssl API
> (and, sadly, a bunch of the ASN.1 stuff) treats these parameters as
> variable-size integers.
>
I agree with your opinion.
Thanks,
Tianjia
next prev parent reply other threads:[~2021-03-03 16:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-01 5:18 [PATCH] selftests/sgx: fix EINIT failure dueto SGX_INVALID_SIGNATURE Tianjia Zhang
2021-03-01 9:54 ` Jarkko Sakkinen
2021-03-02 5:06 ` Tianjia Zhang
2021-03-02 5:54 ` Andy Lutomirski
2021-03-02 13:47 ` Jarkko Sakkinen
2021-03-10 12:44 ` Jia Zhang
2021-03-10 21:39 ` Jarkko Sakkinen
2021-03-11 2:47 ` Jia Zhang
2021-03-11 3:42 ` Jarkko Sakkinen
2021-03-11 4:53 ` Tianjia Zhang
2021-03-12 16:53 ` Jarkko Sakkinen
2021-03-11 5:55 ` Jia Zhang
2021-03-03 12:03 ` Tianjia Zhang [this message]
2021-03-02 12:51 ` Jarkko Sakkinen
2021-03-03 12:12 ` Tianjia Zhang
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