[SeaBIOS] [PATCH 5/5] Give up physical presence when setting TPM into failure mode

[Stefan Berger]

From: Stefan Berger

After temporarily deactivating the TPM, also give up physical
presence to disable more commands.

Signed-off-by: Stefan Berger 
---
 src/tcgbios.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/tcgbios.c b/src/tcgbios.c
index 7bcbdde..685075f 100644
--- a/src/tcgbios.c
+++ b/src/tcgbios.c
@@ -227,6 +227,16 @@ tpm_set_failure(void)
     tpm_send_cmd(0, TPM_ORD_SetTempDeactivated,
                  NULL, 0, TPM_DURATION_TYPE_SHORT);

+    tpm_send_cmd(0, TPM_ORD_PhysicalPresence,
+                 PhysicalPresence_CMD_ENABLE,
+                 sizeof(PhysicalPresence_CMD_ENABLE),
+                 TPM_DURATION_TYPE_SHORT);
+
+    tpm_send_cmd(0, TPM_ORD_PhysicalPresence,
+                 PhysicalPresence_NOT_PRESENT_LOCK,
+                 sizeof(PhysicalPresence_NOT_PRESENT_LOCK),
+                 TPM_DURATION_TYPE_SHORT);
+
     TPM_working = 0;
 }