linux-kernel - Re: [PATCH] tpm: fix buffer overflow in /dev/tpm0

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Message-ID: <20160911185737.GA13353@intel.com>
Date:   Sun, 11 Sep 2016 21:57:37 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Peter Huewe <peterhuewe@....de>
Cc:     Marcel Selhorst <tpmdd@...horst.net>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        "moderated list:TPM DEVICE DRIVER" 
        <tpmdd-devel@...ts.sourceforge.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: fix buffer overflow in /dev/tpm0

On Sun, Sep 11, 2016 at 03:51:42PM +0300, Jarkko Sakkinen wrote:
> On Sun, Sep 11, 2016 at 03:19:00PM +0300, Jarkko Sakkinen wrote:
> > tpm_write() does not check whether the buffer has at least enough space
> > for the header before passing it to tpm_transmit() so an overflow can
> > happen.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> 
> This is usable neither as read nor write primitive for an exploit. Still
> it makes sense to validate the input here.

Cannot add fixes line for this one as it's from pre-GIT times...

/Jarkko