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Redesigning the kernel to avoid switches
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Classroom Contents
Efficiently Mitigating Transient Execution Attacks Using the Unmapped Speculation Contract
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- 1 Intro
- 2 Transient execution attacks risk leaking information Linux maintains security using software mitigations
- 3 Software mitigations are expensive
- 4 Goal: faster mitigations
- 5 Transient execution attack example
- 6 Typical mitigation approach
- 7 Ward has a different approach
- 8 Our observation: Unmapped Speculation Contract (USC)
- 9 USC is a good hardware-software contract
- 10 Split kernel to leverage USC
- 11 Syscalls start executing in the Q-domain
- 12 World switches use two stacks
- 13 Redesigning the kernel to avoid switches
- 14 Allocating memory without world switches
- 15 Implementation
- 16 Ward does better on LEBench
- 17 Related Work: Spectrum of defenses
- 18 Open question: what is the best way to mitigate attacks?
- 19 Conclusion
