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[PATCH] tpm: reorganize sysfs files
Many of the sysfs files were calling the TPM_GetCapability command with array. Since for 1.2 more sysfs files of this type are coming I am generalizing the array so there can be one array and the unique parts can be filled in just before the command is called. Signed-off-by: Kylene Hall <kjhall@us.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Kylene Jo Hall
Linus Torvalds
parent
3c2f606a09
commit
beed53a1aa
1 changed files with 86 additions and 59 deletions
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@ -119,17 +119,57 @@ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
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}
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#define TPM_DIGEST_SIZE 20
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#define CAP_PCR_RESULT_SIZE 18
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static const u8 cap_pcr[] = {
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#define TPM_ERROR_SIZE 10
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#define TPM_RET_CODE_IDX 6
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#define TPM_GET_CAP_RET_SIZE_IDX 10
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#define TPM_GET_CAP_RET_UINT32_1_IDX 14
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#define TPM_GET_CAP_RET_UINT32_2_IDX 18
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#define TPM_GET_CAP_RET_UINT32_3_IDX 22
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#define TPM_GET_CAP_RET_UINT32_4_IDX 26
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#define TPM_CAP_IDX 13
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#define TPM_CAP_SUBCAP_IDX 21
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enum tpm_capabilities {
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TPM_CAP_PROP = 5,
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};
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enum tpm_sub_capabilities {
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TPM_CAP_PROP_PCR = 0x1,
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TPM_CAP_PROP_MANUFACTURER = 0x3,
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};
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/*
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* This is a semi generic GetCapability command for use
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* with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
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* and their associated sub_capabilities.
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*/
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static const u8 tpm_cap[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 22, /* length */
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0, 0, 0, 101, /* TPM_ORD_GetCapability */
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0, 0, 0, 5,
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0, 0, 0, 4,
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0, 0, 1, 1
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0, 0, 0, 0, /* TPM_CAP_<TYPE> */
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0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
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0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
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};
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#define READ_PCR_RESULT_SIZE 30
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static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
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char *desc)
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{
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int err;
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len = tpm_transmit(chip, data, len);
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if (len < 0)
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return len;
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if (len == TPM_ERROR_SIZE) {
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err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
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dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
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return err;
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}
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return 0;
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}
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static const u8 pcrread[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 14, /* length */
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@ -140,8 +180,8 @@ static const u8 pcrread[] = {
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ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u8 data[READ_PCR_RESULT_SIZE];
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ssize_t len;
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u8 data[30];
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ssize_t rc;
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int i, j, num_pcrs;
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__be32 index;
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char *str = buf;
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@ -150,29 +190,24 @@ ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
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if (chip == NULL)
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return -ENODEV;
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memcpy(data, cap_pcr, sizeof(cap_pcr));
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if ((len = tpm_transmit(chip, data, sizeof(data)))
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< CAP_PCR_RESULT_SIZE) {
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dev_dbg(chip->dev, "A TPM error (%d) occurred "
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"attempting to determine the number of PCRS\n",
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be32_to_cpu(*((__be32 *) (data + 6))));
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memcpy(data, tpm_cap, sizeof(tpm_cap));
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data[TPM_CAP_IDX] = TPM_CAP_PROP;
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data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
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rc = transmit_cmd(chip, data, sizeof(data),
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"attempting to determine the number of PCRS");
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if (rc)
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return 0;
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}
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num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
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for (i = 0; i < num_pcrs; i++) {
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memcpy(data, pcrread, sizeof(pcrread));
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index = cpu_to_be32(i);
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memcpy(data + 10, &index, 4);
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if ((len = tpm_transmit(chip, data, sizeof(data)))
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< READ_PCR_RESULT_SIZE){
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dev_dbg(chip->dev, "A TPM error (%d) occurred"
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" attempting to read PCR %d of %d\n",
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be32_to_cpu(*((__be32 *) (data + 6))),
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i, num_pcrs);
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rc = transmit_cmd(chip, data, sizeof(data),
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"attempting to read a PCR");
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if (rc)
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goto out;
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}
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str += sprintf(str, "PCR-%02d: ", i);
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for (j = 0; j < TPM_DIGEST_SIZE; j++)
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str += sprintf(str, "%02X ", *(data + 10 + j));
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@ -194,7 +229,7 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u8 *data;
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ssize_t len;
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ssize_t err;
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int i, rc;
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char *str = buf;
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@ -208,14 +243,10 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
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memcpy(data, readpubek, sizeof(readpubek));
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if ((len = tpm_transmit(chip, data, READ_PUBEK_RESULT_SIZE)) <
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READ_PUBEK_RESULT_SIZE) {
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dev_dbg(chip->dev, "A TPM error (%d) occurred "
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"attempting to read the PUBEK\n",
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be32_to_cpu(*((__be32 *) (data + 6))));
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rc = 0;
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err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
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"attempting to read the PUBEK");
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if (err)
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goto out;
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}
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/*
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ignore header 10 bytes
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@ -245,63 +276,59 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
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if ((i + 1) % 16 == 0)
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str += sprintf(str, "\n");
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}
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rc = str - buf;
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out:
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rc = str - buf;
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kfree(data);
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return rc;
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}
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EXPORT_SYMBOL_GPL(tpm_show_pubek);
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#define CAP_VER_RESULT_SIZE 18
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#define CAP_VERSION_1_1 6
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#define CAP_VERSION_IDX 13
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static const u8 cap_version[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 18, /* length */
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0, 0, 0, 101, /* TPM_ORD_GetCapability */
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0, 0, 0, 6,
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0, 0, 0, 0,
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0, 0, 0, 0
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};
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#define CAP_MANUFACTURER_RESULT_SIZE 18
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static const u8 cap_manufacturer[] = {
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0, 193, /* TPM_TAG_RQU_COMMAND */
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0, 0, 0, 22, /* length */
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0, 0, 0, 101, /* TPM_ORD_GetCapability */
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0, 0, 0, 5,
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0, 0, 0, 4,
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0, 0, 1, 3
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};
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ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u8 data[sizeof(cap_manufacturer)];
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ssize_t len;
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u8 data[30];
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ssize_t rc;
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char *str = buf;
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struct tpm_chip *chip = dev_get_drvdata(dev);
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if (chip == NULL)
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return -ENODEV;
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memcpy(data, cap_manufacturer, sizeof(cap_manufacturer));
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memcpy(data, tpm_cap, sizeof(tpm_cap));
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data[TPM_CAP_IDX] = TPM_CAP_PROP;
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data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
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if ((len = tpm_transmit(chip, data, sizeof(data))) <
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CAP_MANUFACTURER_RESULT_SIZE)
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return len;
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rc = transmit_cmd(chip, data, sizeof(data),
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"attempting to determine the manufacturer");
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if (rc)
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return 0;
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str += sprintf(str, "Manufacturer: 0x%x\n",
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be32_to_cpu(*((__be32 *) (data + 14))));
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be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
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memcpy(data, cap_version, sizeof(cap_version));
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data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
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rc = transmit_cmd(chip, data, sizeof(data),
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"attempting to determine the 1.1 version");
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if (rc)
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goto out;
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if ((len = tpm_transmit(chip, data, sizeof(data))) <
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CAP_VER_RESULT_SIZE)
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return len;
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str +=
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sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n",
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(int) data[14], (int) data[15], (int) data[16],
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(int) data[17]);
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str += sprintf(str,
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"TCG version: %d.%d\nFirmware version: %d.%d\n",
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(int) data[14], (int) data[15], (int) data[16],
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(int) data[17]);
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out:
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return str - buf;
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}
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EXPORT_SYMBOL_GPL(tpm_show_caps);
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