KFENCE: low-overhead sampling-based memory safety error detector

configname: CONFIG_KFENCE

Linux Kernel Configuration
└─>Kernel hacking
└─>Memory Debugging
└─>KFENCE: low-overhead sampling-based memory safety error detector
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
KFENCE is a low-overhead sampling-based detector of heap out-of-bounds
access, use-after-free, and invalid-free errors. KFENCE is designed
to have negligible cost to permit enabling it in production

See Documentation/dev-tools/kfence.rst for more details.

Note that, KFENCE is not a substitute for explicit testing with tools
such as KASAN. KFENCE can detect a subset of bugs that KASAN can
detect, albeit at very different performance profiles. If you can
afford to use KASAN, continue using KASAN, for example in test
environments. If your kernel targets production use, and cannot
enable KASAN due to its cost, consider using KFENCE.