With the help of Claude Opus 4.6, the Linux 7.2 kernel added protections to fend off specially crafted or corrupted perf data for the perf tool that could cause a number of issues for the running system.

The perf.data output and consumed by Linux's perf performance analyzing tool is a binary format containing performance counter data, CPU events, and other useful data. But to now there hasn't been a good job at hardening it to ensure that nothing goes awry if it's corrupted or manipulated for malicious intent

Arnaldo Carvalho de Melo of Red Hat worked on a set of 29 patches with Claude Opus 4.6 to better protect the perf data handling to avoid any accidental or nefarious issues around the perf data handling. The improved validation and handling prevents against out-of-bounds reads/writes, infinite loops, heap overflows, and segmentation faults. There is now defense-in-depth validation for file parsing and a number of other improvements made. Plus a number of bugs were also uncovered and fixed during this big rework. Besides Claude, the Linux kernel's Sashiko also helped on the AI side.

Also as part of the perf tooling work for Linux 7.2 is a set of patches that went through twenty revisions for a new perf inject --aslr feature to better code with Address Space Layout Randomization (ASLR) differences between systems or reboots. This new option will remap virtual memory addresses or drop physical memory event leaks when profile record data is shared between systems.

The perf tools pull also has updates for AMD Zen 6, Intel vendor event updates for a range of processor, IOMMU metrics for both AMD and Intel platforms, and a range of other enhancements.