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Thursday, September 30 • 2:45pm - 3:30pm
(VIRTUAL) Fuzzing Linux with Xen - Tamas K Lengyel, Intel

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Last year we've successfully upstreamed a new feature to Xen that allows high-speed fuzzing of virtual machines (VMs) using VM-forking. Recently through collaboration with the Xen community external monitoring of VMs via Intel Processor Trace has also been upstreamed. Combined with the native Virtual Machine Introspection (VMI) capability Xen now provides a unique platform for fuzzing and binary analysis. To illustrate the power of the platform we'll present the details of a real-world fuzzing operation that targeted Linux kernel-modules from an attack-vector that has previously been hard to reach: memory exposed to devices via Direct Memory Access (DMA) for fast I/O. If the input the kernel reads from DMA-exposed memory is malformed or malicious - what could happen? So far we discovered: 9 NULL-pointer dereferences; 3 array index out-of-bound accesses; 2 infinite-loops in IRQ context and 2 instances of tricking the kernel into accessing user-memory but thinking it is kernel memory. The bugs have been in Linux for many years and were found in kernel modules used by millions of devices. All bugs are now fixed upstream. In this talk we'll show how we found these bugs.

Speakers
avatar for Tamas K Lengyel

Tamas K Lengyel

Senior Security Researcher, Intel
Tamas works as Senior Security Researcher at Intel. He received his PhD in Computer Science from the University of Connecticut where he built hypervisor-based malware-analysis and collection tools. In his free time he is maintainer of the Xen Project Hypervisor's VMI subsystem, LibVMI... Read More →


Thursday September 30, 2021 2:45pm - 3:30pm PDT
Room 402 - Chiliwack