update_engine: Add GetMinFirmwareKeyVersion to read tpm_fwver value
Add function to read the minimum allowed firmware key version, ie.
crossystem tpm_fwver.
This is the firmware key version equivalent of crrev.com/c/927827.
BUG=chromium:840432
TEST='cros_run_unit_tests --board=caroline --packages update_engine'
Change-Id: Iadd56b3283028722c94e4ebc7cf5b6470cf1fec9
Reviewed-on: https://chromium-review.googlesource.com/1049667
Commit-Ready: Marton Hunyady <hunyadym@chromium.org>
Tested-by: Marton Hunyady <hunyadym@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
diff --git a/hardware_chromeos.cc b/hardware_chromeos.cc
index d9c13a3..3099151 100644
--- a/hardware_chromeos.cc
+++ b/hardware_chromeos.cc
@@ -186,6 +186,10 @@
return VbGetSystemPropertyInt("tpm_kernver");
}
+int HardwareChromeOS::GetMinFirmwareKeyVersion() const {
+ return VbGetSystemPropertyInt("tpm_fwver");
+}
+
bool HardwareChromeOS::SetMaxKernelKeyRollforward(int max_kernel_rollforward) {
return VbSetSystemPropertyInt("max_kernel_rollforward",
max_kernel_rollforward) == 0;