Just in Time compilers - breaking a VM
- Type
- Video
- Tags
- Java
- Authors
- Peter Molnar, Roland Lezuo
- Event
- Chaos Communication Congress 24th (24C3) 2007
- Indexed on
- Mar 27, 2013
- URL
- http://dewy.fem.tu-ilmenau.de/CCC/24C3/mpeg4/24c3-2247-en-breaking_a_vm.mp4
- File name
- 24c3-2247-en-breaking_a_vm.mp4
- File size
- 44.3 MB
- MD5
- 65ef6ddd1456d4c33b5122d208679543
- SHA1
- 5cdc7fce3114d062759c9f95ab54fd8304b969ab
We will present state of the art JIT compiler design based on CACAO, a GPL licensed multiplatform Java VM. After explaining the basics of code generation, we will focus on "problematic" instructions, and point to possible ways to exploit stuff. A short introduction into just-in-time compiler techniques is given: Why JIT, about compiler invocation, runtime code modification using signals, codegeneration. Then theoretical attack vectors are elaborated: language bugs, intermediate representation quirks and assembler instruction inadequacies. With these considerations in mind the results of a CACAO code review are presented. For each vulnerability possible exploits are discussed and two realized exploits are demonstrated.
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