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Attack method: write to kernel code!
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Classroom Contents
Control Flow Integrity in the Linux Kernel
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- 1 Intro
- 2 Control Flow Integrity (CFI) in the Linux kernel
- 3 Attack method: write to kernel code!
- 4 What is writable and executable?
- 5 Attack method: call into kernel code!
- 6 direct function calls
- 7 indirect calls: "forward-edge"
- 8 function returns: "backward-edge"
- 9 What contains writable func ptrs?
- 10 What can attacker call? Any executable bytel
- 11 CFI: forward-edge protection
- 12 Forward-edge protection in Clang
- 13 Stock: without Clang CFL
- 14 Protected: with Clang CFI
- 15 Jump tables and type mangling
- 16 Better implementation ideas?
- 17 CFI: backward-edge protection
- 18 Backward-edge protection in Clang
- 19 Gotchas
- 20 Upstreaming status
- 21 Do it yourself!
- 22 What do failures look like?
- 23 Thoughts?
