• Use GWP-ASan to detect exploits in production environments Memory safety bugs like use-after-free and buffer overflows remain among the most exploited vulnerability classes in production software. • While AddressSanitizer (ASan) excels at catching these bugs during development, its performance overhead (2 to 4 times) and security concerns make it unsuitable for production. • What if you could detect many of the same critical bugs in live systems with virtually no performance impact? • GWP-ASan (GWP-ASan Will Provide Allocation SANity) addresses this gap by using a sampling-based approach. • By instrumenting only a fraction of memory allocations, it can detect double-free, use-after-free, and heap-buffer-overflow errors in production at scale while maintaining near-native performance. • In this post, we’ll explain how allocation sanitizers like GWP-ASan work and show how to use one in your projects, using an example based on GWP-ASan from LLVM’s scudo allocator in C++.
Article Summaries:
- Use GWP‑ASan to detect exploits in production environments
Memory‑safety bugs such as use‑after‑free and buffer overflows remain common in production software. While AddressSanitizer (ASan) catches these bugs during development, its high overhead and security concerns limit its use in live systems. GWP‑ASan (GWP‑ASan Will Provide Allocation SANity) offers a sampling‑based solution: it instruments only a fraction of heap allocations, placing them in isolated regions surrounded by guard pages. This approach detects double‑free, use‑after‑free, and heap‑buffer‑overflow errors with near‑native performance, making it suitable for hardening security‑critical production applications.
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