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Date:   Thu, 8 Sep 2022 07:31:40 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
        Shuah Khan <shuah@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Tony Luck <tony.luck@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Kai Huang <kai.huang@intel.com>,
        Wander Lairson Costa <wander@redhat.com>,
        Isaku Yamahata <isaku.yamahata@gmail.com>,
        marcelo.cerri@canonical.com, tim.gardner@canonical.com,
        khalid.elmously@canonical.com, philip.cox@canonical.com,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        linux-doc@vger.kernel.org
Subject: Re: [PATCH v12 1/3] x86/tdx: Add TDX Guest attestation interface
 driver
Message-ID: <Yxl+PE4A+WUfQ7bl@kroah.com>
References: <20220908002723.923241-1-sathyanarayanan.kuppuswamy@linux.intel.com>
 <20220908002723.923241-2-sathyanarayanan.kuppuswamy@linux.intel.com>
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On Wed, Sep 07, 2022 at 05:27:20PM -0700, Kuppuswamy Sathyanarayanan wrote:
> +	/*
> +	 * Per TDX Module 1.0 specification, section titled
> +	 * "TDG.MR.REPORT", REPORTDATA length is fixed as
> +	 * TDX_REPORTDATA_LEN, TDREPORT length is fixed as
> +	 * TDX_REPORT_LEN, and TDREPORT subtype is fixed as
> +	 * 0. Also check for valid user pointers.
> +	 */
> +	if (!req.reportdata || !req.tdreport || req.subtype ||
> +		req.rpd_len != TDX_REPORTDATA_LEN ||
> +		req.tdr_len != TDX_REPORT_LEN)
> +		return -EINVAL;

You never verify that your reserved[7] fields are actually set to 0,
which means you can never use them in the future :(

Please fix that up, thanks.

greg k-h