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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 Google OSS-Fuzz?

OSS-Fuzz offers continuous fuzz testing for open-source software, a technique well-regarded for uncovering coding errors. These errors, such as buffer overflow vulnerabilities, can lead to serious security threats. By utilizing guided in-process fuzzing on Chrome components, Google has identified thousands of security flaws and stability concerns, with plans to broaden the reach of this valuable service to the open-source community. The main goal of OSS-Fuzz is to improve the security and stability of widely utilized open-source software by merging sophisticated fuzzing techniques with an adaptable and distributed framework. For those projects that do not qualify for OSS-Fuzz, alternatives like personal instances of ClusterFuzz or ClusterFuzzLite are available. Currently, OSS-Fuzz supports programming languages such as C/C++, Rust, Go, Python, and Java/JVM, and it may extend its support to additional languages that work with LLVM. Additionally, OSS-Fuzz enables fuzzing for both x86_64 and i386 architecture builds, allowing a diverse array of applications to take advantage of this cutting-edge testing methodology. This initiative aims not only to enhance software quality but also to contribute to the creation of a more secure software ecosystem for every user involved. Such improvements can lead to greater trust in open-source solutions.

Media

Media

Integrations Supported

Atheris
C
C++
ClusterFuzz
Fuzzbuzz
GitHub
Go
Google Cloud Storage
Google ClusterFuzz
Java
Jazzer
Python
Rust

Integrations Supported

Atheris
C
C++
ClusterFuzz
Fuzzbuzz
GitHub
Go
Google Cloud Storage
Google ClusterFuzz
Java
Jazzer
Python
Rust

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

Google

Company Location

United States

Company Website

github.com/google/oss-fuzz

Categories and Features

Categories and Features

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