From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: grawity@gmail.com, James.Bottomley@HansenPartnership.com,
linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH v4] tpm: fix an invalid condition in tpm_common_poll
Date: Thu, 28 Mar 2019 14:34:28 +0200 [thread overview]
Message-ID: <20190328123428.GF7094@linux.intel.com> (raw)
In-Reply-To: <155371155820.17863.10580533125620125669.stgit@tstruk-mobl1.jf.intel.com>
On Wed, Mar 27, 2019 at 11:32:38AM -0700, Tadeusz Struk wrote:
> The poll condition should only check response_length,
> because reads should only be issued if there is data to read.
> The response_read flag only prevents double writes.
> The problem was that the write set the response_read to false,
> enqued a tpm job, and returned. Then application called poll
> which checked the response_read flag and returned EPOLLIN.
> Then the application called read, but got nothing.
> After all that the async_work kicked in.
> Added also mutex_lock around the poll check to prevent
> other possible race conditions.
>
> Cc: stable@vger.kernel.org
> Fixes: 9488585b21bef0df12 ("tpm: add support for partial reads")
> Reported-by: Mantas Mikulėnas <grawity@gmail.com>
> Tested-by: Mantas Mikulėnas <grawity@gmail.com>
> Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Thank you, it is applied.
/Jarkko
next prev parent reply other threads:[~2019-03-28 12:34 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-27 18:32 [PATCH v4] tpm: fix an invalid condition in tpm_common_poll Tadeusz Struk
2019-03-28 12:34 ` Jarkko Sakkinen [this message]
2019-03-28 16:34 ` Tadeusz Struk
2019-04-08 12:01 ` Thibaut Sautereau
2019-04-09 13:44 ` Jarkko Sakkinen
2019-04-23 20:54 ` Jonas Witschel
2019-04-24 0:43 ` Sasha Levin
2019-04-24 7:06 ` Jonas Witschel
2019-05-02 7:22 ` Jarkko Sakkinen
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