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The Linux kernel configuration item CONFIG_KASAN_HW_TAGS
has multiple definitions:
lib/Kconfig.kasan
The configuration item CONFIG_KASAN_HW_TAGS:
CONFIG_HAVE_ARCH_KASAN_HW_TAGS
Enables Hardware Tag-Based KASAN.
Requires GCC 10+ or Clang 12+.
Supported only on arm64 CPUs starting from ARMv8.5 and relies on Memory Tagging Extension and Top Byte Ignore.
Consumes about 1/32nd of available memory.
May potentially introduce problems related to pointer casting and comparison, as it embeds a tag into the top byte of each pointer.
lib/Kconfig.kasan
The configuration item CONFIG_KASAN_HW_TAGS:
( CONFIG_HAVE_ARCH_KASAN_HW_TAGS ) && ( CONFIG_SLUB )
Enables hardware tag-based KASAN mode.
This mode requires hardware memory tagging support, and can be used by any architecture that provides it.
Currently this mode is only implemented for arm64 CPUs starting from ARMv8.5 and relies on Memory Tagging Extension and Top Byte Ignore.
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