linux-kernel - Re: [tpmdd-devel] [PATCH v8 7/8] tpm: TPM 2.0 CRB Interface

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Date:	Tue, 02 Dec 2014 18:07:16 -0500
From:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>,
	Ashley Lai <ashley@...leylai.com>,
	Marcel Selhorst <tpmdd@...horst.net>
CC:	christophe.ricard@...il.com, josh.triplett@...el.com,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	tpmdd-devel@...ts.sourceforge.net,
	jason.gunthorpe@...idianresearch.com,
	trousers-tech@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH v8 7/8] tpm: TPM 2.0 CRB Interface

On 12/02/2014 05:31 PM, Jarkko Sakkinen wrote:


> +struct acpi_tpm2 {
> +	struct acpi_table_header hdr;
> +	u16 platform_class;
> +	u16 reserved;
> +	u64 control_area_pa;
> +	u32 start_method;
> +} __packed;
[...]
> +	}
> +
> +	if (buf->hdr.length != sizeof(struct acpi_tpm2)) {

This should be

if (buf->hdr.length < sizeof(struct acpi_tpm2)) {

since the ACPI TPM2 table may have a variable number of 'Platform 
Specific Parameters' beyond the 'Start Method Field'. What we don't want 
to have is less, but more is fine.

    Stefan

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