From: Stefan Berger <stefanb@linux.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Tomas Winkler <tomas.winkler@intel.com>,
Tadeusz Struk <tadeusz.struk@intel.com>,
Stefan Berger <stefanb@linux.vnet.ibm.com>,
Nayna Jain <nayna@linux.ibm.com>,
stable@vger.kernel.org, Peter Huewe <peterhuewe@gmx.de>,
Jason Gunthorpe <jgg@ziepe.ca>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 04/17] tpm: call tpm2_flush_space() on error in tpm_try_transmit()
Date: Thu, 8 Nov 2018 09:55:15 -0500 [thread overview]
Message-ID: <5f9a97a0-c4e1-41ca-d590-dc0eec2dbb82@linux.ibm.com> (raw)
In-Reply-To: <20181108141541.12832-5-jarkko.sakkinen@linux.intel.com>
On 11/8/18 9:15 AM, Jarkko Sakkinen wrote:
> Always call tpm2_flush_space() on failure in tpm_try_transmit() so that
> the volatile memory of the TPM gets cleared. If /dev/tpm0 does not have
> sufficient permissions (usually it has), this could lead to the leakage
> of TPM objects. Through /dev/tpmrm0 this issue does not raise any new
> security concerns.
>
> Cc: stable@vger.kernel.org
> Fixes: 745b361e989a ("tpm:tpm: infrastructure for TPM spaces")
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> ---
> drivers/char/tpm/tpm-interface.c | 33 +++++++++++++++-----------------
> drivers/char/tpm/tpm.h | 1 +
> drivers/char/tpm/tpm2-space.c | 2 +-
> 3 files changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 64510ed81b46..c9efd1b9fd2c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -224,14 +224,14 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
>
> rc = tpm2_prepare_space(chip, space, ordinal, buf);
> if (rc)
> - goto out;
> + goto out_idle;
>
> rc = chip->ops->send(chip, buf, count);
> if (rc < 0) {
> if (rc != -EPIPE)
> dev_err(&chip->dev,
> "%s: tpm_send: error %d\n", __func__, rc);
> - goto out;
> + goto out_space;
> }
>
> if (chip->flags & TPM_CHIP_FLAG_IRQ)
> @@ -247,7 +247,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
> if (chip->ops->req_canceled(chip, status)) {
> dev_err(&chip->dev, "Operation Canceled\n");
> rc = -ECANCELED;
> - goto out;
> + goto out_space;
> }
>
> tpm_msleep(TPM_TIMEOUT_POLL);
> @@ -257,30 +257,27 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
> chip->ops->cancel(chip);
> dev_err(&chip->dev, "Operation Timed out\n");
> rc = -ETIME;
> - goto out;
> + goto out_space;
>
> out_recv:
> len = chip->ops->recv(chip, buf, bufsiz);
> if (len < 0) {
> rc = len;
> - dev_err(&chip->dev,
> - "tpm_transmit: tpm_recv: error %d\n", rc);
> - goto out;
> - } else if (len < TPM_HEADER_SIZE) {
> + dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
> + } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
> rc = -EFAULT;
> - goto out;
> - }
>
> - if (len != be32_to_cpu(header->length)) {
> - rc = -EFAULT;
> - goto out;
> +out_space:
> + if (rc) {
> + tpm2_flush_space(chip);
> + } else {
> + rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
> + if (rc)
> + dev_err(&chip->dev, "tpm2_commit_space: error %d\n",
> + rc);
> }
>
> - rc = tpm2_commit_space(chip, space, ordinal, buf, &len);
> - if (rc)
> - dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc);
> -
> -out:
> +out_idle:
> /* may fail but do not override previous error value in rc */
> tpm_go_idle(chip, flags);
>
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 49bca4d1e786..229ac42b644e 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -579,6 +579,7 @@ int tpm2_probe(struct tpm_chip *chip);
> int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
> int tpm2_init_space(struct tpm_space *space);
> void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
> +void tpm2_flush_space(struct tpm_chip *chip);
> int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc,
> u8 *cmd);
> int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
> diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> index 1131a8e7b79b..d53c882268ff 100644
> --- a/drivers/char/tpm/tpm2-space.c
> +++ b/drivers/char/tpm/tpm2-space.c
> @@ -162,7 +162,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf,
> return 0;
> }
>
> -static void tpm2_flush_space(struct tpm_chip *chip)
> +void tpm2_flush_space(struct tpm_chip *chip)
> {
> struct tpm_space *space = &chip->work_space;
> int i;
next prev parent reply other threads:[~2018-11-08 14:55 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 14:15 [PATCH v5 00/17] Remove nested TPM operations Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 01/17] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 02/17] tpm: fix invalid return value in pubek_show() Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 03/17] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Jarkko Sakkinen
2018-11-08 14:52 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 04/17] tpm: call tpm2_flush_space() on error in tpm_try_transmit() Jarkko Sakkinen
2018-11-08 14:55 ` Stefan Berger [this message]
2018-11-08 14:15 ` [PATCH v5 05/17] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2018-11-08 14:56 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 06/17] tpm: clean up tpm_try_transmit() error handling flow Jarkko Sakkinen
2018-11-08 14:59 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 07/17] tpm: declare struct tpm_header Jarkko Sakkinen
2018-11-08 15:02 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 08/17] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2018-11-08 15:03 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 09/17] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2018-11-08 17:03 ` Winkler, Tomas
2018-11-08 23:07 ` Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 10/17] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 11/17] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2018-11-08 15:16 ` Stefan Berger
2018-11-08 18:58 ` Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 12/17] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2018-11-08 15:18 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 13/17] tpm: use tpm_try_get_ops() in tpm-sysfs.c Jarkko Sakkinen
2018-11-08 15:26 ` Stefan Berger
2018-11-08 14:15 ` [PATCH v5 14/17] tpm: remove TPM_TRANSMIT_UNLOCKED flag Jarkko Sakkinen
2018-11-08 15:43 ` Stefan Berger
2018-11-08 19:02 ` Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 15/17] tpm: introduce tpm_chip_start() and tpm_chip_stop() Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 16/17] tpm: take TPM chip power gating out of tpm_transmit() Jarkko Sakkinen
2018-11-08 18:38 ` Winkler, Tomas
2018-11-08 23:07 ` Jarkko Sakkinen
2018-11-09 21:37 ` Winkler, Tomas
2018-11-13 11:12 ` Jarkko Sakkinen
2018-11-13 11:58 ` Winkler, Tomas
2018-11-13 15:52 ` Jarkko Sakkinen
2018-11-08 14:15 ` [PATCH v5 17/17] tpm: remove @flags from tpm_transmit() Jarkko Sakkinen
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