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Compilers should be correct. To improve the quality of C compilers, we created Csmith, a randomized test-case generation tool, and spent three years using it to find compiler bugs. During this period we reported more than 325 previously unknown bugs to compiler developers. Every compiler we tested was found to crash and also to silently generate wrong code(More)
Reliable sensor network software is difficult to create: applications are concurrent and distributed, hardware-based memory protection is unavailable, and severe resource constraints necessitate the use of unsafe, low-level languages. Our work improves this situation by providing efficient memory and type safety for TinyOS 2 applications running on the(More)
Integer overflow bugs in C and C++ programs are difficult to track down and may lead to fatal errors or exploitable vulnerabilities. Although a number of tools for finding these bugs exist, the situation is complicated because not all overflows are bugs. Better tools need to be constructed, but a thorough understanding of the issues behind these errors does(More)
TinyOS applications are built with software components that communicate through narrow interfaces. Since components enable fine-grained code reuse, this approach has been successful in creating applications that make very efficient use of the limited code and data memory on sensor network nodes. However, the other important benefit of components---rapid(More)
Interrupt-driven embedded software is hard to thoroughly test since it usually contains a very large number of executable paths. Developers can test more of these paths using <i>random interrupt testing</i>---firing random interrupt handlers at random times. Unfortunately, na&#239;ve application of random testing to interrupt-driven software does not work:(More)
To report a compiler bug, one must often find a small test case that triggers the bug. The existing approach to automated test-case reduction, delta debugging, works by removing substrings of the original input; the result is a concatenation of substrings that delta cannot remove. We have found this approach less than ideal for reducing C programs because(More)
We have designed and implemented ARMor, a system that uses software fault isolation (SFI) to sandbox application code running on small embedded processors. Sandboxing can be used to protect components such as the RTOS and critical control loops from other, less-trusted components. ARMor guarantees <i>memory safety</i> and <i>control flow integrity</i>; it(More)
Sensor nodes are resource poor and failure-prone. Sensor networks are composed of many such nodes that are often hard to physically reach and that are connected by unreliable wireless links. Together, these factors make sensor network debugging into a challenging activity, and in fact it is not uncommon for a deployed sensornet to encounter sporadic faults(More)