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path: root/drivers/char/tpm/tpm-sysfs.c
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Diffstat (limited to 'drivers/char/tpm/tpm-sysfs.c')
-rw-r--r--drivers/char/tpm/tpm-sysfs.c87
1 files changed, 48 insertions, 39 deletions
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 86f38d239476..83a77a445538 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -20,44 +20,48 @@
#include <linux/device.h>
#include "tpm.h"
-#define READ_PUBEK_RESULT_SIZE 314
+struct tpm_readpubek_out {
+ u8 algorithm[4];
+ u8 encscheme[2];
+ u8 sigscheme[2];
+ __be32 paramsize;
+ u8 parameters[12];
+ __be32 keysize;
+ u8 modulus[256];
+ u8 checksum[20];
+} __packed;
+
#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
#define TPM_ORD_READPUBEK 124
-static const struct tpm_input_header tpm_readpubek_header = {
- .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
- .length = cpu_to_be32(30),
- .ordinal = cpu_to_be32(TPM_ORD_READPUBEK)
-};
+
static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
- u8 *data;
- struct tpm_cmd_t tpm_cmd;
- ssize_t err;
- int i, rc;
+ struct tpm_buf tpm_buf;
+ struct tpm_readpubek_out *out;
+ ssize_t rc;
+ int i;
char *str = buf;
struct tpm_chip *chip = to_tpm_chip(dev);
+ char anti_replay[20];
- memset(&tpm_cmd, 0, sizeof(tpm_cmd));
-
- tpm_cmd.header.in = tpm_readpubek_header;
- err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
- READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
- "attempting to read the PUBEK");
- if (err)
- goto out;
-
- /*
- ignore header 10 bytes
- algorithm 32 bits (1 == RSA )
- encscheme 16 bits
- sigscheme 16 bits
- parameters (RSA 12->bytes: keybit, #primes, expbit)
- keylenbytes 32 bits
- 256 byte modulus
- ignore checksum 20 bytes
- */
- data = tpm_cmd.params.readpubek_out_buffer;
+ memset(&anti_replay, 0, sizeof(anti_replay));
+
+ rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
+ if (rc)
+ return rc;
+
+ tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
+
+ rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,
+ READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,
+ "attempting to read the PUBEK");
+ if (rc) {
+ tpm_buf_destroy(&tpm_buf);
+ return 0;
+ }
+
+ out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
str +=
sprintf(str,
"Algorithm: %02X %02X %02X %02X\n"
@@ -68,21 +72,26 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
"%02X %02X %02X %02X\n"
"Modulus length: %d\n"
"Modulus:\n",
- data[0], data[1], data[2], data[3],
- data[4], data[5],
- data[6], data[7],
- data[12], data[13], data[14], data[15],
- data[16], data[17], data[18], data[19],
- data[20], data[21], data[22], data[23],
- be32_to_cpu(*((__be32 *) (data + 24))));
+ out->algorithm[0], out->algorithm[1], out->algorithm[2],
+ out->algorithm[3],
+ out->encscheme[0], out->encscheme[1],
+ out->sigscheme[0], out->sigscheme[1],
+ out->parameters[0], out->parameters[1],
+ out->parameters[2], out->parameters[3],
+ out->parameters[4], out->parameters[5],
+ out->parameters[6], out->parameters[7],
+ out->parameters[8], out->parameters[9],
+ out->parameters[10], out->parameters[11],
+ be32_to_cpu(out->keysize));
for (i = 0; i < 256; i++) {
- str += sprintf(str, "%02X ", data[i + 28]);
+ str += sprintf(str, "%02X ", out->modulus[i]);
if ((i + 1) % 16 == 0)
str += sprintf(str, "\n");
}
-out:
+
rc = str - buf;
+ tpm_buf_destroy(&tpm_buf);
return rc;
}
static DEVICE_ATTR_RO(pubek);