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Message-Id: <20170525211105.843-1-jarkko.sakkinen@linux.intel.com>
Date: Thu, 25 May 2017 14:11:04 -0700
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: tpmdd-devel@...ts.sourceforge.net
Cc: linux-security-module@...r.kernel.org,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Peter Huewe <peterhuewe@....de>,
Marcel Selhorst <tpmdd@...horst.net>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH RFC] tpm: migrate pubek_show to struct tpm_buf
Migrated pubek_show to struct tpm_buf.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
RFC because I cannot test this ATM.
drivers/char/tpm/tpm-sysfs.c | 49 ++++++++++++++++++++------------------------
drivers/char/tpm/tpm.h | 13 ------------
2 files changed, 22 insertions(+), 40 deletions(-)
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 4bd0997cfa2d..bb5b2053137d 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -20,43 +20,37 @@
#include <linux/device.h>
#include "tpm.h"
-#define READ_PUBEK_RESULT_SIZE 314
#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)
{
+ struct tpm_buf tpm_buf;
u8 *data;
- struct tpm_cmd_t tpm_cmd;
- ssize_t err;
- int i, rc;
+ ssize_t rc;
+ int i;
char *str = buf;
-
struct tpm_chip *chip = to_tpm_chip(dev);
+ char anti_replay[20];
- tpm_cmd.header.in = tpm_readpubek_header;
- err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
+ rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);
+ if (rc)
+ return rc;
+
+ /* The checksum is ignored so it doesn't matter what the contents are.
+ */
+ 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 (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;
+ if (rc) {
+ tpm_buf_destroy(&tpm_buf);
+ return 0;
+ }
+
+ data = &tpm_buf.data[10];
str +=
sprintf(str,
"Algorithm: %02X %02X %02X %02X\n"
@@ -80,8 +74,9 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
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);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index af05c1403c6e..5b79b7e06937 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -339,17 +339,6 @@ enum tpm_sub_capabilities {
TPM_CAP_PROP_TIS_DURATION = 0x120,
};
-struct tpm_readpubek_params_out {
- u8 algorithm[4];
- u8 encscheme[2];
- u8 sigscheme[2];
- __be32 paramsize;
- u8 parameters[12]; /*assuming RSA*/
- __be32 keysize;
- u8 modulus[256];
- u8 checksum[20];
-} __packed;
-
typedef union {
struct tpm_input_header in;
struct tpm_output_header out;
@@ -383,8 +372,6 @@ struct tpm_startup_in {
} __packed;
typedef union {
- struct tpm_readpubek_params_out readpubek_out;
- u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
struct tpm_pcrread_in pcrread_in;
struct tpm_pcrread_out pcrread_out;
struct tpm_getrandom_in getrandom_in;
--
2.11.0
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