Static code analysis

Static analysis is a technique for finding bugs just by looking at source code without actually running it. That's great, because it can find bugs that are really hard to trigger.

Tools used to static analysis of OpenVZ components

There are a number of tools which analyze C code and try to detect typical errors. None of these tools is perfect, so using different tools with OpenVZ components will detect more bugs. Be prepared to also get lots of false warnings!

cppcheck

Cppcheck is a static analysis tool for C/C++ code. Unlike C/C++ compilers and many other analysis tools it does not detect syntax errors in the code. Cppcheck primarily detects the types of bugs that the compilers normally do not detect. The goal is to detect only real errors in the code (i.e. have zero false positives).

Some OpenVZ bugs were found using cppcheck: #1309, #1308, #1307, #1306.

Coverity

• vzquota
• vzctl fixes b2f9c254447,138b341a23a,337f712eac4,dfd699a3a52,767289a2eb0,1b01bb34a9e,eebe2c1201a,09f30856fb4,54cbc8ae07a and many others.
• CRIU fixes 08cdae901b56,2b8f61393e0b,4f9e509c1597,8d11952f6bc4,5e82fba10ed4,1e919423a845,1e0e83701f44
• libvzctl
• ploop

Clang

• source code of CRIU was checked clang static analyzer:3ea2fd78ebe21,e2a0be63d4b8e,a6c5953a80d24,f54f9f0efa8cd,f238d56661dae,fcfd705d39b10,6ce8d8ab9309f

PVS-Studio

• Analyzing OpenVZ Components with PVS-Studio

Static analysis tools

• Clang Static Analyzer
• Coccinelle
• smatch
• Saturn
• Flawfinder