CONFIG_KASAN_GENERIC: Generic KASAN

General informations

The Linux kernel configuration item CONFIG_KASAN_GENERIC has multiple definitions:

Generic KASAN found in lib/Kconfig.kasan

The configuration item CONFIG_KASAN_GENERIC:

• prompt: Generic KASAN
• type: bool
• depends on: ( CONFIG_HAVE_ARCH_KASAN && CONFIG_CC_HAS_KASAN_GENERIC ) && ( CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS )
• defined in lib/Kconfig.kasan
• found in Linux kernels: 5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

Enables Generic KASAN.

Requires GCC 8.3.0+ or Clang.

Consumes about 1/8th of available memory at kernel start and adds an overhead of ~50% for dynamic allocations. The performance slowdown is ~x3.

Generic mode found in lib/Kconfig.kasan

The configuration item CONFIG_KASAN_GENERIC:

• prompt: Generic mode
• type: bool
• depends on: ( CONFIG_HAVE_ARCH_KASAN && CONFIG_CC_HAS_KASAN_GENERIC ) && ( CONFIG_CC_HAS_WORKING_NOSANITIZE_ADDRESS )
• defined in lib/Kconfig.kasan
• found in Linux kernels: 5.0–5.18, 5.18+HEAD

Help text

Enables generic KASAN mode.

This mode is supported in both GCC and Clang. With GCC it requires version 8.3.0 or later. Any supported Clang version is compatible, but detection of out-of-bounds accesses for global variables is supported only since Clang 11.

This mode consumes about 1/8th of available memory at kernel start and introduces an overhead of ~x1.5 for the rest of the allocations. The performance slowdown is ~x3.

Currently KASAN_GENERIC 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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