TPM: workaround to enforce PCR updates across suspends

Add a workaround for TPM's which fail to flush last written
PCR values in a TPM_SaveState, in preparation for suspend.

Signed-off-by: David Safford <safford@watson.ibm.com>
Acked-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 40 insertions, 7 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index f06bb37defb1..5c447c991bd5 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -1067,6 +1067,27 @@ void tpm_remove_hardware(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
 
+#define TPM_ORD_SAVESTATE cpu_to_be32(152)
+#define SAVESTATE_RESULT_SIZE 10
+
+static struct tpm_input_header savestate_header = {
+	.tag = TPM_TAG_RQU_COMMAND,
+	.length = cpu_to_be32(10),
+	.ordinal = TPM_ORD_SAVESTATE
+};
+
+/* Bug workaround - some TPM's don't flush the most
+ * recently changed pcr on suspend, so force the flush
+ * with an extend to the selected _unused_ non-volatile pcr.
+ */
+static int tpm_suspend_pcr;
+static int __init tpm_suspend_setup(char *str)
+{
+	get_option(&str, &tpm_suspend_pcr);
+	return 1;
+}
+__setup("tpm_suspend_pcr=", tpm_suspend_setup);
+
 /*
  * We are about to suspend. Save the TPM state
  * so that it can be restored.
@@ -1074,17 +1095,29 @@ EXPORT_SYMBOL_GPL(tpm_remove_hardware);
 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
 {
 	struct tpm_chip *chip = dev_get_drvdata(dev);
-	u8 savestate[] = {
-		0, 193,		/* TPM_TAG_RQU_COMMAND */
-		0, 0, 0, 10,	/* blob length (in bytes) */
-		0, 0, 0, 152	/* TPM_ORD_SaveState */
-	};
+	struct tpm_cmd_t cmd;
+	int rc;
+
+	u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
 
 	if (chip == NULL)
 		return -ENODEV;
 
-	tpm_transmit(chip, savestate, sizeof(savestate));
-	return 0;
+	/* for buggy tpm, flush pcrs with extend to selected dummy */
+	if (tpm_suspend_pcr) {
+		cmd.header.in = pcrextend_header;
+		cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
+		memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
+		       TPM_DIGEST_SIZE);
+		rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+				  "extending dummy pcr before suspend");
+	}
+
+	/* now do the actual savestate */
+	cmd.header.in = savestate_header;
+	rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
+			  "sending savestate before suspend");
+	return rc;
 }
 EXPORT_SYMBOL_GPL(tpm_pm_suspend);