Messages in this thread Patch in this message | | | Date | Tue, 15 Feb 2011 17:45:37 -0800 | From | Greg KH <> | Subject | [071/115] tpm_tis: Use timeouts returned from TPM |
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2.6.32-longterm review patch. If anyone has any objections, please let us know.
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From: Stefan Berger <stefanb@linux.vnet.ibm.com>
commit 9b29050f8f75916f974a2d231ae5d3cd59792296 upstream.
The current TPM TIS driver in git discards the timeout values returned from the TPM. The check of the response packet needs to consider that the return_code field is 0 on success and the size of the expected packet is equivalent to the header size + u32 length indicator for the TPM_GetCapability() result + 3 timeout indicators of type u32.
I am also adding a sysfs entry 'timeouts' showing the timeouts that are being used.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com> Tested-by: Guillaume Chazarain <guichaz@gmail.com> Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/char/tpm/tpm.c | 18 ++++++++++++++++-- drivers/char/tpm/tpm.h | 2 ++ drivers/char/tpm/tpm_tis.c | 4 +++- 3 files changed, 21 insertions(+), 3 deletions(-)
--- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -566,9 +566,11 @@ duration: if (rc) return; - if (be32_to_cpu(tpm_cmd.header.out.return_code) - != 3 * sizeof(u32)) + if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 || + be32_to_cpu(tpm_cmd.header.out.length) + != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32)) return; + duration_cap = &tpm_cmd.params.getcap_out.cap.duration; chip->vendor.duration[TPM_SHORT] = usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short)); @@ -912,6 +914,18 @@ ssize_t tpm_show_caps_1_2(struct device } EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); +ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tpm_chip *chip = dev_get_drvdata(dev); + + return sprintf(buf, "%d %d %d\n", + jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]), + jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]), + jiffies_to_usecs(chip->vendor.duration[TPM_LONG])); +} +EXPORT_SYMBOL_GPL(tpm_show_timeouts); + ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -56,6 +56,8 @@ extern ssize_t tpm_show_owned(struct dev char *); extern ssize_t tpm_show_temp_deactivated(struct device *, struct device_attribute *attr, char *); +extern ssize_t tpm_show_timeouts(struct device *, + struct device_attribute *attr, char *); struct tpm_chip; --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -354,6 +354,7 @@ static DEVICE_ATTR(temp_deactivated, S_I NULL); static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); +static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); static struct attribute *tis_attrs[] = { &dev_attr_pubek.attr, @@ -363,7 +364,8 @@ static struct attribute *tis_attrs[] = { &dev_attr_owned.attr, &dev_attr_temp_deactivated.attr, &dev_attr_caps.attr, - &dev_attr_cancel.attr, NULL, + &dev_attr_cancel.attr, + &dev_attr_timeouts.attr, NULL, }; static struct attribute_group tis_attr_grp = {
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