Banishing memory safety bugs cuts critical vulnerabilities
But after four years in which Android has been collecting bits of Rust, that figure has declined. "From 2019 to 2022 the annual number of memory safety vulnerabilities dropped from 223 down to 85," said Android security engineer Jeffrey Vander Stoep in aVander Stoep says the decline coincides with efforts to move away from memory unsafe programming languages, by which he means C/C++ – a language that does not guarantee memory safety but can support it.
Starting with Android 12 last year, Rust became an Android platform language. And now in Android 13, says Vander Stoep, the majority of new code added to the release was written in a memory safe language – Rust, Java, or Kotlin. With less memory-unsafe code entering Android, memory safety flaws have gone from 76 percent of Android vulnerabilities in 2019 to 35 percent in 2022 – the first year for which memory safety bugs do not represent the majority of vulnerabilities. Other vulnerabilities have remained steady over time, appearing at a rate of about 20 per month over the past four years. Because memory safety flaws accounted for most of the critical issues, the vulnerabilities that have surfaced have proven to be less severe. Google is not the only large tech company to recognize the benefits of memory safe code. Meta has voiced
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