linux advocates have long insisted that open-source development results in better and more secure software. Now they have statistics to back up their claims.
According to a four-year analysis of the 5.7 million lines of Linux source code conducted by five Stanford University computer science researchers, the Linux kernel programming code is better and more secure than the programming code of most proprietary software.
The report, set to be released on Tuesday, states that the 2.6 Linux production kernel, shipped with software from Red Hat, Novell and other major Linux software vendors, contains 985 bugs in 5.7 million lines of code, well below the industry average for commercial enterprise software. Windows XP, by comparison, contains about 40 million lines of code, with new bugs found on a frequent basis.
Commercial software typically has 20 to 30 bugs for every 1,000 lines of code, according to Carnegie Mellon University's CyLab Sustainable Computing Consortium. This would be equivalent to 114,000 to 171,000 bugs in 5.7 million lines of code.
The study identified 0.17 bugs per 1,000 lines of code in the Linux kernel. Of the 985 bugs identified, 627 were in critical parts of the kernel. Another 569 could cause a system crash, 100 were security holes, and 33 of the bugs could result in less-than-optimal system performance.
Seth Hallem, CEO of Coverity, a provider of source-code analysis, noted that the majority of the bugs documented in the study have already been fixed by members of the open-source development community.
"Our findings show that Linux contains an extremely low defect rate and is evidence of the strong security of Linux," said Hallem. "Many security holes in software are the result of software bugs that can be eliminated with good programming processes."
The Linux source-code analysis project started in 2000 at the Stanford University Computer Science Research Center as part of a large research initiative to improve core software engineering processes in the software industry.
The initiative now continues at Coverity, a software engineering startup that now employs the five researchers who conducted the study. Coverity said it intends to start providing Linux bug analysis reports on a regular basis and will make a summary of the results freely available to the Linux development community.
"This is a benefit to the Linux development community, and we appreciate Coverity's efforts to help us improve the security and stability of Linux," said Andrew Morton, lead Linux kernel maintainer. Morton said developers have already addressed the top-priority bugs uncovered in the study.