update_engine: Add functions for reading/writing TPM values for rollback.
- Adds function to read the minimum allowed kernel key version
ie. crossystem tpm_kernver
- Adds function to set the maximum kernel key version roll forward
value. ie. crossystem max_kernel_rollforward
- Future CL will set max_kernel_rollforward to tpm_kerver as a temporary
measure to preserve the rollback window until server side changes
are made.
BUG=chromium:814090
TEST=FEATURES=test emerge-samus update_engine
Change-Id: I8d0c7db438cbc892745917ad56ea013e87361898
Reviewed-on: https://chromium-review.googlesource.com/927827
Commit-Ready: Zentaro Kavanagh <[email protected]>
Tested-by: Zentaro Kavanagh <[email protected]>
Reviewed-by: Amin Hassani <[email protected]>
Reviewed-by: Sen Jiang <[email protected]>
diff --git a/hardware_android.cc b/hardware_android.cc
index 58c68b6..7bd296b 100644
--- a/hardware_android.cc
+++ b/hardware_android.cc
@@ -165,6 +165,16 @@
return GetProperty(kPropBootBaseband, "");
}
+int HardwareAndroid::GetMinKernelKeyVersion() const {
+ LOG(WARNING) << "STUB: No Kernel key version is available.";
+ return -1;
+}
+
+bool HardwareAndroid::SetMaxKernelKeyRollforward(int max_kernel_rollforward) {
+ LOG(WARNING) << "STUB: Setting max_kernel_rollforward is not supported.";
+ return false;
+}
+
int HardwareAndroid::GetPowerwashCount() const {
LOG(WARNING) << "STUB: Assuming no factory reset was performed.";
return 0;
