linux-kernel - Re: [PATCH v12 2/3] selftests: tdx: Test TDX attestation GetReport support

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Date:   Fri, 9 Sep 2022 03:48:08 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "wander@...hat.com" <wander@...hat.com>,
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        "Luck, Tony" <tony.luck@...el.com>,
        "khalid.elmously@...onical.com" <khalid.elmously@...onical.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "Cox, Philip" <philip.cox@...onical.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v12 2/3] selftests: tdx: Test TDX attestation GetReport
 support

On Wed, 2022-09-07 at 17:27 -0700, Kuppuswamy Sathyanarayanan wrote:
> +TEST(verify_report)
> +{
> +	__u8 reportdata[TDX_REPORTDATA_LEN];
> +	struct tdreport tdreport;
> +	struct tdx_report_req req;
> +	int devfd, i;
> +
> +	devfd = open(TDX_GUEST_DEVNAME, O_RDWR | O_SYNC);
> +
> +	ASSERT_LT(0, devfd);
> +
> +	/* Generate sample report data */
> +	for (i = 0; i < TDX_REPORTDATA_LEN; i++)
> +		reportdata[i] = i;
> +
> +	/* Initialize IOCTL request */
> +	req.subtype     = 0;
> +	req.reportdata  = (__u64)reportdata;
> +	req.rpd_len     = TDX_REPORTDATA_LEN;
> +	req.tdreport    = (__u64)&tdreport;
> +	req.tdr_len     = sizeof(tdreport);
> +

'req' is a local variable, which isn't guaranteed to be zero. Looks you need to
explicitly clear 'req' otherwise the req.reserved[7] may not be zero.

-- 
Thanks,
-Kai