linux-kernel - [RFC PATCH 12/12] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200325194317.526492-13-ross.philipson@oracle.com>
Date:   Wed, 25 Mar 2020 15:43:17 -0400
From:   Ross Philipson <ross.philipson@...cle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-doc@...r.kernel.org
Cc:     ross.philipson@...cle.com, dpsmith@...rtussolutions.com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        trenchboot-devel@...glegroups.com
Subject: [RFC PATCH 12/12] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

The Secure Launch MLE environment uses PCRs that are only accessible from
the DRTM locality 2. By default the TPM drivers always initialize the
locality to 0. When a Secure Launch is in progress, initialize the
locality to 2.

Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
---
 drivers/char/tpm/tpm-chip.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 3d6d394a8661..e74860537252 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -23,6 +23,7 @@
 #include <linux/major.h>
 #include <linux/tpm_eventlog.h>
 #include <linux/hw_random.h>
+#include <linux/slaunch.h>
 #include "tpm.h"
 
 DEFINE_IDR(dev_nums_idr);
@@ -34,12 +35,20 @@ dev_t tpm_devt;
 
 static int tpm_request_locality(struct tpm_chip *chip)
 {
-	int rc;
+	int rc, locality;
 
 	if (!chip->ops->request_locality)
 		return 0;
 
-	rc = chip->ops->request_locality(chip, 0);
+	if (slaunch_get_flags() & (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) {
+		dev_dbg(&chip->dev, "setting TPM locality to 2 for MLE\n");
+		locality = 2;
+	} else {
+		dev_dbg(&chip->dev, "setting TPM locality to 0\n");
+		locality = 0;
+	}
+
+	rc = chip->ops->request_locality(chip, locality);
 	if (rc < 0)
 		return rc;
 
-- 
2.25.1