linux-kernel - Re: [PATCH v7 3/5] tpm: Clean up reading of timeout and duration capabilities

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Message-ID: <CAO_EM_kFH+qO9P0b6dPOvYEGyPTq=3iGR8jVoDChtr6bB51Hzg@mail.gmail.com>
Date:	Tue, 21 Jun 2016 17:21:27 -0700
From:	Ed Swierk <eswierk@...portsystems.com>
To:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Cc:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Stefan Berger <stefanb@...ibm.com>,
	Ed Swierk <eswierk@...portsystems.com>
Subject: Re: [PATCH v7 3/5] tpm: Clean up reading of timeout and duration capabilities

On Mon, Jun 20, 2016 at 6:54 PM, Ed Swierk <eswierk@...portsystems.com> wrote:
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -461,9 +461,19 @@ ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
>                 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
>                 tpm_cmd.params.getcap_in.subcap = subcap_id;
>         }
> +
>         rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
> +
> +       if (!rc &&
> +           ((subcap_id == TPM_CAP_PROP_TIS_TIMEOUT &&
> +             be32_to_cpu(tpm_cmd.header.out.length) != TPM_HEADER_SIZE + 5) ||
> +            (subcap_id == TPM_CAP_PROP_TIS_DURATION &&
> +             be32_to_cpu(tpm_cmd.header.out.length) != TPM_HEADER_SIZE + 4)))
> +               rc = -EINVAL;
> +

Woops, a totally innocuous last-minute (post-testing) cleanup broke
this code; should be TPM_HEADER_SIZE + 20 and + 16. I'll push out v8
as soon as I redo my tests.

--Ed