linux-kernel - Re: [PATCH v2 3/3] selftests/tdx: Test GetQuote TDX attestation feature

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Date:   Thu, 27 Apr 2023 12:53:52 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Dionna Amalie Glaze <dionnaglaze@...gle.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        "H . Peter Anvin" <hpa@...or.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Chong Cai <chongc@...gle.com>, Qinkun Bao <qinkun@...che.org>,
        Guorui Yu <GuoRui.Yu@...ux.alibaba.com>,
        Du Fan <fan.du@...el.com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 3/3] selftests/tdx: Test GetQuote TDX attestation
 feature

On 4/26/23 08:47, Dionna Amalie Glaze wrote:
>> +/* Helper function to get TDREPORT */
>> +long get_tdreport0(int devfd, struct tdx_report_req *req)
>> +{
>> +       int i;
>> +
>> +       /* Generate sample report data */
>> +       for (i = 0; i < TDX_REPORTDATA_LEN; i++)
>> +               req->reportdata[i] = i;
>> +
> Shouldn't req be zeroed before populating reportdata? We wouldn't want
> uninitialized memory to leave the guest. I know this is just a test,
> but it's best to model good practices for anyone that might
> copy/paste.

It's leaving the guest and going to the TDX module.  What's the problem
there?