Mysterious ExUuidCreate function
I was inspired to write this post after being confused by behaviour of ExUuidCreate function in Windows Vista.
This function is used to generate GUIDs at kernel mode. According to documentation: "ExUuidCreate returns STATUS_SUCCESS if successful; otherwise, if the system is not ready to generate a new UUID, it returns STATUS_RETRY." Practically, if you call this function say in driver which is loading by boot loader (if the driver has "Start" registry value equal to 0 due to SERVICE_BOOT_START flag set when creating service using CreateService) you can observe strange behaviour, especially in Vista.
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Please, read the rest of this post at http://www.shcherbyna.com/?p=114