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CONFIG_KASAN: KASAN: runtime memory debugger

General informations

The Linux kernel configuration item CONFIG_KASAN has multiple definitions:

KASAN: runtime memory debugger found in lib/Kconfig.kasan

The configuration item CONFIG_KASAN:

Help text

Enables KASAN (KernelAddressSANitizer) - runtime memory debugger, designed to find out-of-bounds accesses and use-after-free bugs. See Documentation/dev-tools/kasan.rst for details.

KASan: runtime memory debugger found in lib/Kconfig.kasan

The configuration item CONFIG_KASAN:

Help text

Enables kernel address sanitizer - runtime memory debugger, designed to find out-of-bounds accesses and use-after-free bugs. This is strictly a debugging feature and it requires a gcc version of 4.9.2 or later. Detection of out of bounds accesses to stack or global variables requires gcc 5.0 or later. This feature consumes about 1/8 of available memory and brings about ~x3 performance slowdown. For better error detection enable STACKTRACE. Currently KASAN doesn't work with DEBUG_SLAB (the resulting kernel does not boot).

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