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1,000,000 Watchpoints, 20 Applications, 1 Driver, 0 Kernel Modifications
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Next: 1 The Samba tour of scripting languages
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Marks
Author(s):
Todd Austin
Location
Caro
Date
jan Wed 18
Days Raw Files
Start
14:20
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Duration
0:50:00
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None
End
15:10
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None min.
http://lca2012.linux.org.au/schedule/105/view_talk
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1000000_Watchpoints_20_Applications_1_Driver_0_Kernel_Modifications.json
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State-of-the-art tools in dynamic program security vulnerability analysis, such as Valgrind, Sage or Testudo, require the ability to efficiently monitor program variable accesses. The traditional approach of using binary instrumentation or mprotect can slow analyzed programs by orders of magnitude. In this talk, I'll present a open-source kernel-level solution that implements unlimited byte-level watchpoints with significantly less slowdown. Our approach utilizes a run-time loadable kernel module that works with unmodified recent versions of the Linux kernel. We've shown that our watchpoint facility serves security vulnerability analysis well, as well as program debugging, software-based transactional memory, and other applications. At the heart of our watchpoint technology is efficient kernel-level shadow paging and judicious use of instruction interpretation to avoid painfully slow single-step invocations. We're looking for new applications and new users!
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