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What is LibFuzzer?

LibFuzzer is an in-process engine that employs coverage-guided techniques for evolutionary fuzzing. By integrating directly with the library being tested, it injects generated fuzzed inputs into a specific entry point or target function, allowing it to track executed code paths while modifying the input data to improve code coverage. The coverage information is gathered through LLVM’s SanitizerCoverage instrumentation, which provides users with comprehensive insights into the testing process. Importantly, LibFuzzer is continuously maintained, with critical bugs being resolved as they are identified. To use LibFuzzer with a particular library, the first step is to develop a fuzz target; this function takes a byte array and interacts meaningfully with the API under scrutiny. Notably, this fuzz target functions independently of LibFuzzer, making it compatible with other fuzzing tools like AFL or Radamsa, which adds flexibility to testing approaches. Moreover, combining various fuzzing engines can yield more thorough testing results and deeper understanding of the library's security flaws, ultimately enhancing the overall quality of the code. The ongoing evolution of fuzzing techniques ensures that developers are better equipped to identify and address potential vulnerabilities effectively.

What is Fuzzing Project?

Fuzzing is a powerful technique for uncovering software defects. It fundamentally involves creating a multitude of random inputs for the software to handle, allowing developers to analyze the results. A crash in a program typically signals an underlying issue that needs addressing. While this method is well-known, it can often reveal bugs—including those with serious security implications—in widely utilized software surprisingly easily. The most common problems found during fuzzing are memory access errors, which are particularly frequent in applications written in C or C++. Generally, the core issue is that the software attempts to access invalid memory addresses. Although modern Linux or BSD operating systems offer a range of essential tools for file viewing and analysis, most are not designed to process untrusted inputs effectively. On the other hand, the latest advancements in tools enable developers to identify and explore these vulnerabilities with greater precision. These developments not only bolster security measures but also enhance the overall robustness of software applications, ultimately leading to more reliable systems. As technology continues to evolve, the importance of employing such methods in software development only grows.

Media

Media

Integrations Supported

C
C++
Atheris
ClusterFuzz
Fuzzbuzz
Google ClusterFuzz
Jazzer

Integrations Supported

C
C++
Atheris
ClusterFuzz
Fuzzbuzz
Google ClusterFuzz
Jazzer

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

LLVM Project

Date Founded

2003

Company Website

llvm.org/docs/LibFuzzer.html

Company Facts

Organization Name

Fuzzing Project

Company Website

fuzzing-project.org

Categories and Features

Categories and Features

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