MJ0011 - Windows 10 Control Flow Guard Internals

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Initialize Load Config and Bitmap • LdrpCfgProcessLoadConfig • Check PE Headers->OptionalHeader.DllCharacteristics • IMAGE_DLLCHARACTERISTICS_GUARD_CF flag • Set LoadConfig-><strong>Guard</strong>CFCheckFunctionPointer • LdrpValidateUserCallTarget • Initialize LdrSystemDllInitBlock • +0x60 : Bitmap Address • +0x68 : Bitmap Size • Initialized by PspPrepareSystemDllInitBlock • NtCreateUserProcess->PspAllocateProcess->PspSetupUserProcessAddressSpace
Call Target Validation Logics • LdrpValidateUserCallTarget • It will only execute <strong>10</strong> instructions in most cases
Page 1 and 2: Windows 10 Control Flow Guard Inter
Page 3 and 4: Intro to Control Flow Guard • New
Page 5 and 6: Control Flow Guard • CFG will pre
Page 7: New Load Config Structure • New l
Page 11 and 12: Call Target Validation Logics • L
Page 13 and 14: Call Target Validation Logics • L
Page 15 and 16: Unmapped Bitmap Processing • RtlD
Page 17 and 18: How CFG Works: Kernel Mode Part •
Page 19 and 20: Process Creation Process • PspApp
Page 21 and 22: Shared Bitmap VS. Private Bitmap
Page 23 and 24: Stack Address • If we know thread
Page 25 and 26: Unaligned Guard Functions • Did e
Page 27 and 28: Fixed Kernel Address • Starting f
Page 29 and 30: Acknowledgement • Yuki Chen • V

MJ0011 - Windows 10 Control Flow Guard Internals

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