linux-kernel - Re: [PATCH] tpm: fix response size validation in tpm_get

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Message-ID: <20180905111256.GA9696@linux.intel.com>
Date:   Wed, 5 Sep 2018 14:12:56 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-security-module@...r.kernel.org, stable@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: fix response size validation in tpm_get_random()

On Mon, Sep 03, 2018 at 04:10:04AM +0300, Jarkko Sakkinen wrote:
> When checking whether the response is large enough to be able to contain
> the received random bytes in tpm_get_random() and tpm2_get_random(),
> they fail to take account the header size, which should be added to the
> minimum size. This commit fixes this issue.
> 
> Cc: stable@...r.kernel.org
> Fixes: c659af78eb7b ("tpm: Check size of response before accessing data")
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Stefan, you did the original commit. Does this look right to you?

/Jarkko