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Date: Fri, 30 Aug 2019 14:54:24 -0700
From: Jerry Snitselaar <jsnitsel@...hat.com>
To: linux-integrity@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Alexey Klimov <aklimov@...hat.com>,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH 1/3 v3] tpm: Remove duplicate code from caps_show() in
tpm-sysfs.c
On Thu Aug 29 19, Jerry Snitselaar wrote:
>From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>
>Replace existing TPM 1.x version structs with new structs that consolidate
>the common parts into a single struct so that code duplication is no longer
>needed in caps_show().
>
>Cc: Peter Huewe <peterhuewe@....de>
>Cc: Jason Gunthorpe <jgg@...pe.ca>
>Cc: Alexey Klimov <aklimov@...hat.com>
>Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>
>Tested-by: Jerry Snitselaar <jsnitsel@...hat.com>
>---
> drivers/char/tpm/tpm-sysfs.c | 44 ++++++++++++++++++------------------
> drivers/char/tpm/tpm.h | 23 ++++++++-----------
> 2 files changed, 32 insertions(+), 35 deletions(-)
>
>diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
>index d9caedda075b..e0550f0cfd8f 100644
>--- a/drivers/char/tpm/tpm-sysfs.c
>+++ b/drivers/char/tpm/tpm-sysfs.c
>@@ -217,6 +217,7 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> struct tpm_chip *chip = to_tpm_chip(dev);
>+ struct tpm1_version *version;
> ssize_t rc = 0;
> char *str = buf;
> cap_t cap;
>@@ -232,31 +233,30 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
> str += sprintf(str, "Manufacturer: 0x%x\n",
> be32_to_cpu(cap.manufacturer_id));
>
>- /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
>- rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
>+ /* TPM 1.2 */
>+ if (!tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
> "attempting to determine the 1.2 version",
>- sizeof(cap.tpm_version_1_2));
>- if (!rc) {
>- str += sprintf(str,
>- "TCG version: %d.%d\nFirmware version: %d.%d\n",
>- cap.tpm_version_1_2.Major,
>- cap.tpm_version_1_2.Minor,
>- cap.tpm_version_1_2.revMajor,
>- cap.tpm_version_1_2.revMinor);
>- } else {
>- /* Otherwise just use TPM_STRUCT_VER */
>- if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
>- "attempting to determine the 1.1 version",
>- sizeof(cap.tpm_version)))
>- goto out_ops;
>- str += sprintf(str,
>- "TCG version: %d.%d\nFirmware version: %d.%d\n",
>- cap.tpm_version.Major,
>- cap.tpm_version.Minor,
>- cap.tpm_version.revMajor,
>- cap.tpm_version.revMinor);
>+ sizeof(cap.version2))) {
>+ version = &cap.version2.version;
>+ goto out_print;
> }
>+
>+ /* TPM 1.1 */
>+ if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
>+ "attempting to determine the 1.1 version",
>+ sizeof(cap.version1))) {
>+ version = &cap.version1;
>+ goto out_ops;
>+ }
Jarkko, does the following change to the above block look good? I'll
submit a v4. With the current patch it is setting version when the
tpm1_getcap fails for 1.1 instead of when it succeeds. I only have
1.2 and 2.0 devices, so I didn't hit it when testing your patch.
+ /* TPM 1.1 */
+ if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version",
+ sizeof(cap.version1)))
+ goto out_ops;
+
+ version = &cap.version1;
>+
>+out_print:
>+ str += sprintf(str,
>+ "TCG version: %d.%d\nFirmware version: %d.%d\n",
>+ version->major, version->minor,
>+ version->rev_major, version->rev_minor);
>+
> rc = str - buf;
>+
> out_ops:
> tpm_put_ops(chip);
> return rc;
>diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
>index a7fea3e0ca86..a4f74dd02a35 100644
>--- a/drivers/char/tpm/tpm.h
>+++ b/drivers/char/tpm/tpm.h
>@@ -186,19 +186,16 @@ struct stclear_flags_t {
> u8 bGlobalLock;
> } __packed;
>
>-struct tpm_version_t {
>- u8 Major;
>- u8 Minor;
>- u8 revMajor;
>- u8 revMinor;
>+struct tpm1_version {
>+ u8 major;
>+ u8 minor;
>+ u8 rev_major;
>+ u8 rev_minor;
> } __packed;
>
>-struct tpm_version_1_2_t {
>- __be16 tag;
>- u8 Major;
>- u8 Minor;
>- u8 revMajor;
>- u8 revMinor;
>+struct tpm1_version2 {
>+ __be16 tag;
>+ struct tpm1_version version;
> } __packed;
>
> struct timeout_t {
>@@ -243,8 +240,8 @@ typedef union {
> struct stclear_flags_t stclear_flags;
> __u8 owned;
> __be32 num_pcrs;
>- struct tpm_version_t tpm_version;
>- struct tpm_version_1_2_t tpm_version_1_2;
>+ struct tpm1_version version1;
>+ struct tpm1_version2 version2;
> __be32 manufacturer_id;
> struct timeout_t timeout;
> struct duration_t duration;
>--
>2.21.0
>
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