linux-kernel - [PATCH v2 1/3] tpm: move endianness conversion of TPM_TAG_RQU_COMMAND to tpm_input

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Message-ID: <20170503161911.17606-2-roberto.sassu@huawei.com>
Date:   Wed, 3 May 2017 18:19:09 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <tpmdd-devel@...ts.sourceforge.net>
CC:     <linux-ima-devel@...ts.sourceforge.net>,
        <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH v2 1/3] tpm: move endianness conversion of TPM_TAG_RQU_COMMAND to tpm_input_header

In the long term, TPM 1.2 functions in the driver interface will be
modified to use tpm_buf_init().

However, tag and ordinals cannot be passed directly to tpm_buf_init(),
because this function performs CPU native to big-endian conversion of these
arguments. Since TPM_TAG_RQU_COMMAND and TPM_ORD_ are already converted,
passing them to the function will undo the previous conversion.

This patch moves the conversion of TPM_TAG_RQU_COMMAND from the tpm.h
header file in the driver directory to the tpm_input_header declarations
in the driver interface and tpm-sysfs.c.

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
v2
- restored TPM_TAG_RQU_COMMAND definition in drivers/char/tpm/tpm.h
- removed endianness conversion in TPM_TAG_RQU_COMMAND definition
- removed '#include <linux/tpm_command.h>' in tpm-interface.c
  and tpm-sysfs.c

 drivers/char/tpm/tpm-interface.c | 14 +++++++-------
 drivers/char/tpm/tpm-sysfs.c     |  2 +-
 drivers/char/tpm/tpm.h           |  2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index bd2128e..a6bc0ba 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -472,7 +472,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *buf,
 #define TPM_ORD_GET_RANDOM cpu_to_be32(70)
 
 static const struct tpm_input_header tpm_getcap_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(22),
 	.ordinal = TPM_ORD_GET_CAP
 };
@@ -514,7 +514,7 @@ EXPORT_SYMBOL_GPL(tpm_getcap);
 #define TPM_ST_STATE cpu_to_be16(2)
 #define TPM_ST_DEACTIVATED cpu_to_be16(3)
 static const struct tpm_input_header tpm_startup_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(12),
 	.ordinal = TPM_ORD_STARTUP
 };
@@ -664,7 +664,7 @@ EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 #define CONTINUE_SELFTEST_RESULT_SIZE 10
 
 static const struct tpm_input_header continue_selftest_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(10),
 	.ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
 };
@@ -691,7 +691,7 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
 #define READ_PCR_RESULT_SIZE 30
 #define READ_PCR_RESULT_BODY_SIZE 20
 static const struct tpm_input_header pcrread_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(14),
 	.ordinal = TPM_ORDINAL_PCRREAD
 };
@@ -769,7 +769,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read);
 #define EXTEND_PCR_RESULT_SIZE 34
 #define EXTEND_PCR_RESULT_BODY_SIZE 20
 static const struct tpm_input_header pcrextend_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(34),
 	.ordinal = TPM_ORD_PCR_EXTEND
 };
@@ -991,7 +991,7 @@ EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
 #define SAVESTATE_RESULT_SIZE 10
 
 static const struct tpm_input_header savestate_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(10),
 	.ordinal = TPM_ORD_SAVESTATE
 };
@@ -1076,7 +1076,7 @@ EXPORT_SYMBOL_GPL(tpm_pm_resume);
 
 #define TPM_GETRANDOM_RESULT_SIZE	18
 static const struct tpm_input_header tpm_getrandom_header = {
-	.tag = TPM_TAG_RQU_COMMAND,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(14),
 	.ordinal = TPM_ORD_GET_RANDOM
 };
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 2f596d7..a078b4d 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -24,7 +24,7 @@
 #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,
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
 	.length = cpu_to_be32(30),
 	.ordinal = TPM_ORD_READPUBEK
 };
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4937b56..7d6a606 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -215,7 +215,7 @@ struct tpm_output_header {
 	__be32	return_code;
 } __packed;
 
-#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
+#define TPM_TAG_RQU_COMMAND 193
 
 struct	stclear_flags_t {
 	__be16	tag;
-- 
2.9.3