Software-tag-based KASAN

The kernel address sanitizer (KASAN) is a kernel debugging tool meant to catch incorrect use of kernel pointers. It is an effective tool, if the number of KASAN-based bug reports showing up on the mailing lists is any indication. The downside of KASAN is a significant increase in the amount of memory used by a running system. The software-tag-based mode proposed by Andrey Konovalov has the potential to address that problem, but it brings some limitations of its own.

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