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Attacking Client-Side JIT Compilers

Black Hat via YouTube

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This talk examines JavaScript JIT compiler internals and their security implications, covering runtime values, type speculation, compiler pipelines, optimizations, bug categories, and exploitation of a WebKit vulnerability.

Syllabus

Intro
JavaScript Values
JIT Compilers
JavaScript
Type Information
Example
Speculation Guards
Speculation All
JIT Compiler Pipeline
Summary
Bug Categories
Lowpass handlers
Takeaway
Optimization
Optimizations
bounds checking
check bounced
range analysis
speed analysis
bounce check
what could go wrong
NVH
Exploit
More examples
What is redundancy
How would you do this
The function
Shape guards
Arrays
Objects
Pseudocode
Abstract Interpreter
CreateThis
Graph Building
Check Hoisting
Demo
Calculator
KXTed
Conclusion

Taught by

Black Hat

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