linux-kernel - Re: [PATCH] tpm: fix race condition in tpm_common

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Message-ID: <20180530110112.GB14905@linux.intel.com>
Date:   Wed, 30 May 2018 14:01:12 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Tadeusz Struk <tadeusz.struk@...el.com>
Cc:     jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] tpm: fix race condition in tpm_common_write()

On Wed, May 23, 2018 at 10:57:07AM -0700, Tadeusz Struk wrote:
> On 05/23/2018 06:23 AM, Jarkko Sakkinen wrote:
> > Ouch o_O Do you have a fixes tag for this one?
> > 
> 
> This one is quite tricky.
> The original bug was introduced by abce9ac292e13 (tpm: Propagate error from tpm_transmit to fix a timeout hang)
> and the code back then was in drivers/char/tpm/tpm-interface.c file
> 
> Then there were two other commits that moved the code around:
> afdba32e2a9ea (tpm: Pull everything related to /dev/tpmX into tpm-dev.c)
> which moved it from drivers/char/tpm/tpm-interface.c into drivers/char/tpm/tpm-dev.c
> 
> and last one, ecb38e2f521b0 (tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c)
> which moved it from drivers/char/tpm/tpm-dev.c into tpm-common-dev.c
> 
> I have no idea how to tag it. Maybe we can use:
> Fixes: ecb38e2f521b0 ("tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c")
> 
> And then it probably needs to be back ported manually all the way back to abce9ac292e13.
> 
> Thanks,
> -- 
> Tadeusz

Thank you. I'll cc this to stable.

/Jarkko