linux-kernel - [PATCH v1.2 2/4] key: add tpm

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Message-Id: <1289230246-3856-3-git-send-email-zohar@linux.vnet.ibm.com>
Date:	Mon,  8 Nov 2010 10:30:44 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org, keyrings@...ux-nfs.org,
	linux-crypto@...r.kernel.org, David Howells <dhowells@...hat.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Subject: [PATCH v1.2 2/4] key: add tpm_send command

Add internal kernel tpm_send() command used to seal/unseal keys.

Signed-off-by: David Safford <safford@...son.ibm.com>
Reviewd-by: Mimi Zohar <zohar@...son.ibm.com>
Acked-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Acked-by: Serge E. Hallyn <serge@...lyn.com>
---
 drivers/char/tpm/tpm.c |   17 +++++++++++++++++
 include/linux/tpm.h    |    3 +++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 7c41335..5987d9c 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -780,6 +780,23 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 }
 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
 
+int tpm_send(u32 chip_num, char *cmd, int buflen)
+{
+	struct tpm_chip *chip;
+	int rc;
+
+	chip = tpm_chip_find_get(chip_num);
+	if (chip == NULL)
+		return -ENODEV;
+
+	rc = transmit_cmd(chip, (struct tpm_cmd_t *)cmd, buflen,
+			  "attempting tpm_cmd");
+
+	module_put(chip->dev->driver->owner);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(tpm_send);
+
 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
 		      char *buf)
 {
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index ac5d1c1..a0ecaa9 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -31,6 +31,7 @@
 
 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
+extern int tpm_send(u32 chip_num, char *cmd, int buflen);
 #else
 static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
 	return -ENODEV;
@@ -38,5 +39,7 @@ static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
 static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
 	return -ENODEV;
 }
+static inline int tpm_send(u32 chip_num, char *cmd, int buflen) {
+	return -ENODEV;
 #endif
 #endif
-- 
1.7.2.2

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