From: Greg KH <gregkh@linuxfoundation.org>
To: Josh Zimmerman <joshz@google.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
tpmdd-devel@lists.sourceforge.net, stable@vger.kernel.org
Subject: Re: [PATCH v1 4/4] tpm: Issue a TPM2_Shutdown for TPM2 devices.
Date: Tue, 18 Jul 2017 17:49:42 +0200 [thread overview]
Message-ID: <20170718154942.GD30882@kroah.com> (raw)
In-Reply-To: <20170714195803.7035-5-joshz@google.com>
On Fri, Jul 14, 2017 at 12:58:03PM -0700, Josh Zimmerman wrote:
> Backport of d1bd4a792d3961a04e6154118816b00167aad91a upstream.
>
> If a TPM2 loses power without a TPM2_Shutdown command being issued (a
> "disorderly reboot"), it may lose some state that has yet to be
> persisted to NVRam, and will increment the DA counter. After the DA
> counter gets sufficiently large, the TPM will lock the user out.
>
> NOTE: This only changes behavior on TPM2 devices. Since TPM1 uses sysfs,
> and sysfs relies on implicit locking on chip->ops, it is not safe to
> allow this code to run in TPM1, or to add sysfs support to TPM2, until
> that locking is made explicit.
> ---
> drivers/char/tpm/tpm-chip.c | 36 ++++++++++++++++++++++++++++++++++++
> drivers/char/tpm/tpm-sysfs.c | 7 +++++++
> 2 files changed, 43 insertions(+)
>
Again no signed-off-by :(
next prev parent reply other threads:[~2017-07-18 15:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-14 19:57 [PATCH v1 0/2] Run TPM2_Shutdown on system shutdown Josh Zimmerman
2017-07-14 19:58 ` [PATCH v1 1/4] tpm: Get rid of chip->pdev Josh Zimmerman
2017-07-14 19:58 ` [PATCH v1 2/4] tpm: Provide strong locking for device removal Josh Zimmerman
2017-07-14 19:58 ` [PATCH v1 3/4] Add "shutdown" to "struct class".' Josh Zimmerman
2017-07-18 15:48 ` Greg KH
2017-07-14 19:58 ` [PATCH v1 4/4] tpm: Issue a TPM2_Shutdown for TPM2 devices Josh Zimmerman
2017-07-18 15:49 ` Greg KH [this message]
2017-07-18 16:11 ` Josh Zimmerman
2017-07-18 16:29 ` Greg KH
2017-07-18 16:33 ` Josh Zimmerman
2017-07-18 15:50 ` [PATCH v1 0/2] Run TPM2_Shutdown on system shutdown Greg KH
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