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Message-Id: <3c344e37-e256-0dee-4751-e58c598dd76c@linux.ibm.com>
Date: Fri, 16 Nov 2018 12:06:13 -0500
From: Stefan Berger <stefanb@...ux.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
linux-integrity@...r.kernel.org
Cc: linux-security-module@...r.kernel.org,
James Bottomley <James.Bottomley@...senPartnership.com>,
Tomas Winkler <tomas.winkler@...el.com>,
Tadeusz Struk <tadeusz.struk@...el.com>,
Stefan Berger <stefanb@...ux.vnet.ibm.com>,
Nayna Jain <nayna@...ux.ibm.com>,
Peter Huewe <peterhuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 11/17] tpm: move TPM space code out of tpm_transmit()
On 11/16/18 7:38 AM, Jarkko Sakkinen wrote:
> Prepare and commit TPM space before and after calling tpm_transmit()
> instead of doing that inside tpm_transmit(). After this change we can
> remove TPM_TRANSMIT_NESTED flag from tpm2_prepare_space() and
> tpm2_commit_space() and replace it with TPM_TRANSMIT_UNLOCKED.
>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
> drivers/char/tpm/tpm-dev-common.c | 30 ++++++++++++++++++++++++++----
> drivers/char/tpm/tpm-interface.c | 29 +++--------------------------
> drivers/char/tpm/tpm2-space.c | 12 ++++++------
> 3 files changed, 35 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c
> index cbb0ee30b511..40c1cb09ebd2 100644
> --- a/drivers/char/tpm/tpm-dev-common.c
> +++ b/drivers/char/tpm/tpm-dev-common.c
> @@ -30,13 +30,35 @@ static DEFINE_MUTEX(tpm_dev_wq_lock);
> static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space,
> u8 *buf, size_t bufsiz)
> {
> - ssize_t ret;
> + struct tpm_header *header = (void *)buf;
> + ssize_t ret, len;
>
> mutex_lock(&chip->tpm_mutex);
> - ret = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
> - mutex_unlock(&chip->tpm_mutex);
> + ret = tpm2_prepare_space(chip, space, buf, bufsiz);
> + /* If the command is not implemented by the TPM, synthesize a
> + * response with a TPM2_RC_COMMAND_CODE return for user-space.
> + */
> + if (ret == -EOPNOTSUPP) {
> + header->length = cpu_to_be32(sizeof(*header));
> + header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
> + header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
> + TSS2_RESMGR_TPM_RC_LAYER);
> + ret = sizeof(*header);
> + }
> + if (ret)
> + goto out_lock;
>
> - return ret;
> + len = tpm_transmit(chip, space, buf, bufsiz, TPM_TRANSMIT_UNLOCKED);
> + if (len < 0)
> + ret = len;
> +
> + if (ret)
> + tpm2_flush_space(chip);
> + else
> + ret = tpm2_commit_space(chip, space, buf, &len);
> +out_lock:
> + mutex_unlock(&chip->tpm_mutex);
> + return ret ? ret : len;
> }
>
> static void tpm_dev_async_work(struct work_struct *work)
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index a6ffd0960ae5..7bec03e46043 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -147,27 +147,12 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
> return -E2BIG;
> }
>
> - rc = tpm2_prepare_space(chip, space, buf, bufsiz);
> - /*
> - * If the command is not implemented by the TPM, synthesize a
> - * response with a TPM2_RC_COMMAND_CODE return for user-space.
> - */
> - if (rc == -EOPNOTSUPP) {
> - header->length = cpu_to_be32(sizeof(*header));
> - header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
> - header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
> - TSS2_RESMGR_TPM_RC_LAYER);
> - return sizeof(*header);
> - }
> - if (rc)
> - return rc;
> -
> 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_space;
> + return rc;
> }
>
> if (chip->flags & TPM_CHIP_FLAG_IRQ)
> @@ -182,8 +167,7 @@ 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_space;
> + return -ECANCELED;
> }
>
> tpm_msleep(TPM_TIMEOUT_POLL);
> @@ -192,8 +176,7 @@ 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_space;
> + return -ETIME;
>
> out_recv:
> len = chip->ops->recv(chip, buf, bufsiz);
> @@ -203,12 +186,6 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
> } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
> rc = -EFAULT;
>
> -out_space:
> - if (rc)
> - tpm2_flush_space(chip);
> - else
> - rc = tpm2_commit_space(chip, space, buf, &len);
> -
> return rc ? rc : len;
> }
>
> diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c
> index 172c9f9d4c29..995c8b963d65 100644
> --- a/drivers/char/tpm/tpm2-space.c
> +++ b/drivers/char/tpm/tpm2-space.c
> @@ -39,7 +39,7 @@ static void tpm2_flush_sessions(struct tpm_chip *chip, struct tpm_space *space)
> for (i = 0; i < ARRAY_SIZE(space->session_tbl); i++) {
> if (space->session_tbl[i])
> tpm2_flush_context_cmd(chip, space->session_tbl[i],
> - TPM_TRANSMIT_NESTED);
> + TPM_TRANSMIT_UNLOCKED);
> }
> }
>
> @@ -84,7 +84,7 @@ static int tpm2_load_context(struct tpm_chip *chip, u8 *buf,
> tpm_buf_append(&tbuf, &buf[*offset], body_size);
>
> rc = tpm_transmit_cmd(chip, NULL, &tbuf, 4,
> - TPM_TRANSMIT_NESTED, NULL);
> + TPM_TRANSMIT_UNLOCKED, NULL);
> if (rc < 0) {
> dev_warn(&chip->dev, "%s: failed with a system error %d\n",
> __func__, rc);
> @@ -133,7 +133,7 @@ static int tpm2_save_context(struct tpm_chip *chip, u32 handle, u8 *buf,
> tpm_buf_append_u32(&tbuf, handle);
>
> rc = tpm_transmit_cmd(chip, NULL, &tbuf, 0,
> - TPM_TRANSMIT_NESTED, NULL);
> + TPM_TRANSMIT_UNLOCKED, NULL);
> if (rc < 0) {
> dev_warn(&chip->dev, "%s: failed with a system error %d\n",
> __func__, rc);
> @@ -170,7 +170,7 @@ void tpm2_flush_space(struct tpm_chip *chip)
> for (i = 0; i < ARRAY_SIZE(space->context_tbl); i++)
> if (space->context_tbl[i] && ~space->context_tbl[i])
> tpm2_flush_context_cmd(chip, space->context_tbl[i],
> - TPM_TRANSMIT_NESTED);
> + TPM_TRANSMIT_UNLOCKED);
>
> tpm2_flush_sessions(chip, space);
> }
> @@ -419,7 +419,7 @@ static int tpm2_map_response_header(struct tpm_chip *chip, u32 cc, u8 *rsp,
>
> return 0;
> out_no_slots:
> - tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_NESTED);
> + tpm2_flush_context_cmd(chip, phandle, TPM_TRANSMIT_UNLOCKED);
> dev_warn(&chip->dev, "%s: out of slots for 0x%08X\n", __func__,
> phandle);
> return -ENOMEM;
> @@ -507,7 +507,7 @@ static int tpm2_save_space(struct tpm_chip *chip)
> return rc;
>
> tpm2_flush_context_cmd(chip, space->context_tbl[i],
> - TPM_TRANSMIT_NESTED);
> + TPM_TRANSMIT_UNLOCKED);
> space->context_tbl[i] = ~0;
> }
>
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