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From b662e6fd7169f31ef664ecd0b0b45547462e1e31 Mon Sep 17 00:00:00 2001
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From: Stefan Berger <stefanb@linux.ibm.com>
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Date: Tue, 4 Jan 2022 14:45:31 -0500
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Subject: [PATCH] tpm2: When writing state initialize s_ContextSlotMask if not
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set
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If s_ContextSlotMask was not set since the TPM 2 was not initialized
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by a call to TPM_Manufacture() or the state was not resumed, then
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initialize the s_ContextSlotMask to 0xffff.
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This situation can occur if a VM with an attached swtpm was started
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and the VM's firmware either doesn't support TPM or didn't get to
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initialize the vTPM.
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The following commands recreated the issue with a SeaBIOS-only VM that
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had no attached hard disk but an attached TPM 2:
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virsh start BIOS-only-VM ; virsh save BIOS-only-VM save.bin ; \
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virsh restore save.bin
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Error: Failed to restore domain from save.bin
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error: internal error: qemu unexpectedly closed the monitor: \
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2022-01-04T19:26:18.835851Z qemu-system-x86_64: tpm-emulator: Setting the stateblob (type 2) failed with a TPM error 0x3 a parameter is bad
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2022-01-04T19:26:18.835899Z qemu-system-x86_64: error while loading state for instance 0x0 of device 'tpm-emulator'
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2022-01-04T19:26:18.835929Z qemu-system-x86_64: load of migration failed: Input/output error
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2035731
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Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
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---
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src/tpm2/NVMarshal.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/src/tpm2/NVMarshal.c b/src/tpm2/NVMarshal.c
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index 996c73c..c7cd1e0 100644
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--- a/src/tpm2/NVMarshal.c
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+++ b/src/tpm2/NVMarshal.c
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@@ -1422,6 +1422,11 @@ STATE_RESET_DATA_Marshal(STATE_RESET_DATA *data, BYTE **buffer, INT32 *size)
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written += UINT16_Marshal(&array_size, buffer, size);
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for (i = 0; i < array_size; i++)
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written += UINT16_Marshal(&data->contextArray[i], buffer, size);
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+
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+ if (s_ContextSlotMask != 0x00ff && s_ContextSlotMask != 0xffff) {
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+ /* TPM wasn't initialized, so s_ContextSlotMask wasn't set */
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+ s_ContextSlotMask = 0xffff;
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+ }
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written += UINT16_Marshal(&s_ContextSlotMask, buffer, size);
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written += UINT64_Marshal(&data->contextCounter, buffer, size);
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--
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2.36.1
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