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[67.207.112.138]) by smtp.gmail.com with ESMTPSA id i89sm335594pfi.22.2016.06.10.18.55.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 10 Jun 2016 18:55:20 -0700 (PDT) From: Ed Swierk To: tpmdd-devel@lists.sourceforge.net Cc: eswierk@skyportsystems.com, stefanb@us.ibm.com, jarkko.sakkinen@linux.intel.com, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, jgunthorpe@obsidianresearch.com Subject: [PATCH v6 4/5] tpm: Allow TPM chip drivers to override reported command durations Date: Fri, 10 Jun 2016 18:55:06 -0700 Message-Id: <1465610107-87762-5-git-send-email-eswierk@skyportsystems.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465610107-87762-1-git-send-email-eswierk@skyportsystems.com> References: <1465426818-89356-1-git-send-email-eswierk@skyportsystems.com> <1465610107-87762-1-git-send-email-eswierk@skyportsystems.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Some TPM chips report bogus command durations in their capabilities, just as others report incorrect timeouts. Rework tpm_get_timeouts() to allow chip drivers to override either via a single callback. Also clean up handling of TPMs that report milliseconds instead of microseconds. Signed-off-by: Ed Swierk --- drivers/char/tpm/tpm-interface.c | 139 +++++++++++++++++++++------------------ drivers/char/tpm/tpm_tis.c | 35 +++------- include/linux/tpm.h | 3 +- 3 files changed, 85 insertions(+), 92 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 4d1f62c..a14adfd 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -550,83 +550,94 @@ static int tpm_get_cap_prop(struct tpm_chip *chip, __be32 type, int size, int tpm_get_timeouts(struct tpm_chip *chip) { - struct tpm_cmd_t tpm_cmd; - unsigned long new_timeout[4]; - unsigned long old_timeout[4]; - struct duration_t *duration_cap; - ssize_t rc; + cap_t cap1, cap2; + int rc; + struct tpm_vendor_specific orig_vendor; - rc = tpm_get_cap_prop(chip, TPM_CAP_PROP_TIS_TIMEOUT, 4, - &tpm_cmd.params.getcap_out.cap, "timeouts"); + rc = tpm_get_cap_prop(chip, TPM_CAP_PROP_TIS_TIMEOUT, 4, &cap1, + "timeouts"); if (rc) return rc; - old_timeout[0] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.a); - old_timeout[1] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.b); - old_timeout[2] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.c); - old_timeout[3] = be32_to_cpu(tpm_cmd.params.getcap_out.cap.timeout.d); - memcpy(new_timeout, old_timeout, sizeof(new_timeout)); + rc = tpm_get_cap_prop(chip, TPM_CAP_PROP_TIS_DURATION, 3, &cap2, + "durations"); + if (rc) + return rc; - /* - * Provide ability for vendor overrides of timeout values in case - * of misreporting. - */ - if (chip->ops->update_timeouts != NULL) - chip->vendor.timeout_adjusted = - chip->ops->update_timeouts(chip, new_timeout); + be32_to_cpus(&cap1.timeout.a); + be32_to_cpus(&cap1.timeout.b); + be32_to_cpus(&cap1.timeout.c); + be32_to_cpus(&cap1.timeout.d); + chip->vendor.timeout_a = usecs_to_jiffies(cap1.timeout.a); + chip->vendor.timeout_b = usecs_to_jiffies(cap1.timeout.b); + chip->vendor.timeout_c = usecs_to_jiffies(cap1.timeout.c); + chip->vendor.timeout_d = usecs_to_jiffies(cap1.timeout.d); - if (!chip->vendor.timeout_adjusted) { - /* Don't overwrite default if value is 0 */ - if (new_timeout[0] != 0 && new_timeout[0] < 1000) { - int i; - - /* timeouts in msec rather usec */ - for (i = 0; i != ARRAY_SIZE(new_timeout); i++) - new_timeout[i] *= 1000; - chip->vendor.timeout_adjusted = true; - } + /* Some TPMs report timeouts in milliseconds rather than + microseconds. Use a value between 1 and 1000 as an + indication that this is the case. */ + if (cap1.timeout.a > 0 && cap1.timeout.a < 1000) { + chip->vendor.timeout_a = msecs_to_jiffies(cap1.timeout.a); + chip->vendor.timeout_b = msecs_to_jiffies(cap1.timeout.b); + chip->vendor.timeout_c = msecs_to_jiffies(cap1.timeout.c); + chip->vendor.timeout_d = msecs_to_jiffies(cap1.timeout.d); + chip->vendor.timeout_adjusted = true; } - /* Report adjusted timeouts */ + be32_to_cpus(&cap2.duration.tpm_short); + be32_to_cpus(&cap2.duration.tpm_medium); + be32_to_cpus(&cap2.duration.tpm_long); + chip->vendor.duration[TPM_SHORT] = + usecs_to_jiffies(cap2.duration.tpm_short); + chip->vendor.duration[TPM_MEDIUM] = + usecs_to_jiffies(cap2.duration.tpm_medium); + chip->vendor.duration[TPM_LONG] = + usecs_to_jiffies(cap2.duration.tpm_long); + + memcpy(&orig_vendor, &chip->vendor, sizeof(orig_vendor)); + + /* Interpret duration values between 1 and 10000 as + milliseconds to deal with TPMs like the Broadcom BCM0102 in + the Dell Latitude D820. */ + if (cap2.duration.tpm_short > 0 && cap2.duration.tpm_short < 10000) { + chip->vendor.duration[TPM_SHORT] = + msecs_to_jiffies(cap2.duration.tpm_short); + chip->vendor.duration[TPM_MEDIUM] = + msecs_to_jiffies(cap2.duration.tpm_medium); + chip->vendor.duration[TPM_LONG] = + msecs_to_jiffies(cap2.duration.tpm_long); + chip->vendor.duration_adjusted = true; + } + + if (chip->ops->update_timeouts != NULL) + chip->ops->update_timeouts(chip); + if (chip->vendor.timeout_adjusted) { dev_info(chip->pdev, - HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n", - old_timeout[0], new_timeout[0], - old_timeout[1], new_timeout[1], - old_timeout[2], new_timeout[2], - old_timeout[3], new_timeout[3]); + HW_ERR "Adjusted timeouts: A %u->%uus B %u->%uus" + " C %u->%uus D %u->%uus\n", + jiffies_to_usecs(orig_vendor.timeout_a), + jiffies_to_usecs(chip->vendor.timeout_a), + jiffies_to_usecs(orig_vendor.timeout_b), + jiffies_to_usecs(chip->vendor.timeout_b), + jiffies_to_usecs(orig_vendor.timeout_c), + jiffies_to_usecs(chip->vendor.timeout_c), + jiffies_to_usecs(orig_vendor.timeout_d), + jiffies_to_usecs(chip->vendor.timeout_d)); } - chip->vendor.timeout_a = usecs_to_jiffies(new_timeout[0]); - chip->vendor.timeout_b = usecs_to_jiffies(new_timeout[1]); - chip->vendor.timeout_c = usecs_to_jiffies(new_timeout[2]); - chip->vendor.timeout_d = usecs_to_jiffies(new_timeout[3]); - - rc = tpm_get_cap_prop(chip, TPM_CAP_PROP_TIS_DURATION, 3, - &tpm_cmd.params.getcap_out.cap, "durations"); - if (rc) - return rc; - - duration_cap = &tpm_cmd.params.getcap_out.cap.duration; - chip->vendor.duration[TPM_SHORT] = - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short)); - chip->vendor.duration[TPM_MEDIUM] = - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium)); - chip->vendor.duration[TPM_LONG] = - usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long)); - - /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above - * value wrong and apparently reports msecs rather than usecs. So we - * fix up the resulting too-small TPM_SHORT value to make things work. - * We also scale the TPM_MEDIUM and -_LONG values by 1000. - */ - if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) { - chip->vendor.duration[TPM_SHORT] = HZ; - chip->vendor.duration[TPM_MEDIUM] *= 1000; - chip->vendor.duration[TPM_LONG] *= 1000; - chip->vendor.duration_adjusted = true; - dev_info(chip->pdev, "Adjusting TPM timeout parameters."); + if (chip->vendor.duration_adjusted) { + dev_info(chip->pdev, + HW_ERR "Adjusted durations: short %u->%uus" + " medium %u->%uus long %u->%uus\n", + jiffies_to_usecs(orig_vendor.duration[TPM_SHORT]), + jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]), + jiffies_to_usecs(orig_vendor.duration[TPM_MEDIUM]), + jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]), + jiffies_to_usecs(orig_vendor.duration[TPM_LONG]), + jiffies_to_usecs(chip->vendor.duration[TPM_LONG])); } + return 0; } EXPORT_SYMBOL_GPL(tpm_get_timeouts); diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index 088fa86..caf7278 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -475,34 +475,17 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len) return rc; } -struct tis_vendor_timeout_override { - u32 did_vid; - unsigned long timeout_us[4]; -}; - -static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = { - /* Atmel 3204 */ - { 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000), - (TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } }, -}; - -static bool tpm_tis_update_timeouts(struct tpm_chip *chip, - unsigned long *timeout_cap) +static void tpm_tis_update_timeouts(struct tpm_chip *chip) { - int i; - u32 did_vid; - - did_vid = ioread32(chip->vendor.iobase + TPM_DID_VID(0)); - - for (i = 0; i != ARRAY_SIZE(vendor_timeout_overrides); i++) { - if (vendor_timeout_overrides[i].did_vid != did_vid) - continue; - memcpy(timeout_cap, vendor_timeout_overrides[i].timeout_us, - sizeof(vendor_timeout_overrides[i].timeout_us)); - return true; + switch (ioread32(chip->vendor.iobase + TPM_DID_VID(0))) { + case 0x32041114: /* Atmel 3204 */ + chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT); + chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT); + chip->vendor.timeout_adjusted = true; + break; } - - return false; } /* diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 706e63e..2380ebf 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -41,8 +41,7 @@ struct tpm_class_ops { int (*send) (struct tpm_chip *chip, u8 *buf, size_t len); void (*cancel) (struct tpm_chip *chip); u8 (*status) (struct tpm_chip *chip); - bool (*update_timeouts)(struct tpm_chip *chip, - unsigned long *timeout_cap); + void (*update_timeouts)(struct tpm_chip *chip); };