CONFIG_KASAN: KASAN: dynamic memory safety error detector

General informations

The Linux kernel configuration item CONFIG_KASAN has multiple definitions:

KASAN: dynamic memory safety error detector found in lib/Kconfig.kasan

The configuration item CONFIG_KASAN:

• prompt: KASAN: dynamic memory safety error detector
• type: bool
• depends on: (((( CONFIG_HAVE_ARCH_KASAN && CONFIG_CC_HAS_KASAN_GENERIC ) || \) && ( CONFIG_SYSFS && ! CONFIG_SLUB_TINY )
• defined in lib/Kconfig.kasan
• found in Linux kernels: 5.19, 6.0–6.12

Help text

Enables KASAN (Kernel Address Sanitizer) - a dynamic memory safety error detector designed to find out-of-bounds and use-after-free bugs.

See Documentation/dev-tools/kasan.rst for details.

For better error reports, also enable STACKTRACE.

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

The configuration item CONFIG_KASAN:

• prompt: KASAN: runtime memory debugger
• type: bool
• depends on: (((( CONFIG_HAVE_ARCH_KASAN && CONFIG_CC_HAS_KASAN_GENERIC ) || \) && (( CONFIG_SLUB && CONFIG_SYSFS ) || ( CONFIG_SLAB && ! CONFIG_DEBUG_SLAB ))
• defined in lib/Kconfig.kasan
• found in Linux kernels: 5.0–5.18, 5.18+HEAD

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:

• prompt: KASan: runtime memory debugger
• type: bool
• depends on: ( CONFIG_SLUB && CONFIG_SYSFS ) || ( CONFIG_SLAB && ! CONFIG_DEBUG_SLAB )
• defined in lib/Kconfig.kasan
• found in Linux kernels: 4.0–4.20

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).

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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