Code Integrity Diagnostic System Log Events
The Code Integrity component of Windows Vista and later versions of Windows enforces the requirement that kernel-mode drivers be signed in order to load. Windows Vista and later versions of Windows always generate Code Integrity operational events and optionally will generate additional system audit events and verbose diagnostic events that provide information about the status of driver signing, as follows:
The Code Integrity operational log includes warning events that indicate that a kernel-mode driver failed to load because the driver signature could not be verified. Signature verification can fail for the following reasons:
- An administrator preinstalled an unsigned driver, but Code Integrity subsequently blocked loading the unsigned driver.
- The driver is signed, but the signature is invalid because the driver file has been altered.
- The system disk device might have device errors when reading the file for the driver from bad disk sectors.
If system audit policy is enabled, Code Integrity generates System Audit log events that correspond to the Operational warning events that indicate that signature verification of driver file failed. System audit policy is not enabled by default.
If verbose logging for Code Integrity is enabled, Code Integrity logs analytic and debug events that provide information about successful verification checks that occur prior to loading kernel-mode driver files. Verbose logging for Code Integrity is not enabled by default.
For more information about how to enable the system audit log and verbose logging, see Enabling the System Event Audit Log.