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| author | Stefan Berger <stefanb@linux.vnet.ibm.com> | 2017-01-19 13:19:12 +0100 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2017-01-23 17:28:18 +0100 |
| commit | c659af78eb7b7d7be40f23d9d97bde58eb1368ac (patch) | |
| tree | 88dfa2afb97240abe521a65639795bd969eb749e /drivers/char/tpm/tpm-sysfs.c | |
| parent | tpm_tis: use default timeout value if chip reports it as zero (diff) | |
| download | linux-c659af78eb7b7d7be40f23d9d97bde58eb1368ac.tar.xz linux-c659af78eb7b7d7be40f23d9d97bde58eb1368ac.zip | |
tpm: Check size of response before accessing data
Make sure that we have not received less bytes than what is indicated
in the header of the TPM response. Also, check the number of bytes in
the response before accessing its data.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkine@linux.intel.com>
Diffstat (limited to 'drivers/char/tpm/tpm-sysfs.c')
| -rw-r--r-- | drivers/char/tpm/tpm-sysfs.c | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 848ad6580b46..2f596d74f80c 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -21,6 +21,7 @@ #include "tpm.h" #define READ_PUBEK_RESULT_SIZE 314 +#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256) #define TPM_ORD_READPUBEK cpu_to_be32(124) static const struct tpm_input_header tpm_readpubek_header = { .tag = TPM_TAG_RQU_COMMAND, @@ -39,7 +40,8 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, struct tpm_chip *chip = to_tpm_chip(dev); tpm_cmd.header.in = tpm_readpubek_header; - err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0, + err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, + READ_PUBEK_RESULT_MIN_BODY_SIZE, 0, "attempting to read the PUBEK"); if (err) goto out; @@ -95,7 +97,8 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr, struct tpm_chip *chip = to_tpm_chip(dev); rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap, - "attempting to determine the number of PCRS"); + "attempting to determine the number of PCRS", + sizeof(cap.num_pcrs)); if (rc) return 0; @@ -120,7 +123,8 @@ static ssize_t enabled_show(struct device *dev, struct device_attribute *attr, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, - "attempting to determine the permanent enabled state"); + "attempting to determine the permanent enabled state", + sizeof(cap.perm_flags)); if (rc) return 0; @@ -136,7 +140,8 @@ static ssize_t active_show(struct device *dev, struct device_attribute *attr, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, - "attempting to determine the permanent active state"); + "attempting to determine the permanent active state", + sizeof(cap.perm_flags)); if (rc) return 0; @@ -152,7 +157,8 @@ static ssize_t owned_show(struct device *dev, struct device_attribute *attr, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap, - "attempting to determine the owner state"); + "attempting to determine the owner state", + sizeof(cap.owned)); if (rc) return 0; @@ -168,7 +174,8 @@ static ssize_t temp_deactivated_show(struct device *dev, ssize_t rc; rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap, - "attempting to determine the temporary state"); + "attempting to determine the temporary state", + sizeof(cap.stclear_flags)); if (rc) return 0; @@ -186,7 +193,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, char *str = buf; rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap, - "attempting to determine the manufacturer"); + "attempting to determine the manufacturer", + sizeof(cap.manufacturer_id)); if (rc) return 0; str += sprintf(str, "Manufacturer: 0x%x\n", @@ -194,7 +202,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */ rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap, - "attempting to determine the 1.2 version"); + "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", @@ -205,7 +214,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, } else { /* Otherwise just use TPM_STRUCT_VER */ rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap, - "attempting to determine the 1.1 version"); + "attempting to determine the 1.1 version", + sizeof(cap.tpm_version)); if (rc) return 0; str += sprintf(str, |