CONFIG_ARM64_MTE: Memory Tagging Extension support

General informations

The Linux kernel configuration item CONFIG_ARM64_MTE:

• prompt: Memory Tagging Extension support
• type: bool
• depends on: ( CONFIG_ARM64_AS_HAS_MTE && CONFIG_ARM64_TAGGED_ADDR_ABI ) && ( CONFIG_AS_HAS_ARMV8_5 ) && ( CONFIG_AS_HAS_LSE_ATOMICS ) && ( CONFIG_ARM64_PAN )
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.10–5.19, 6.0–6.12

Help text

Memory Tagging (part of the ARMv8.5 Extensions) provides architectural support for run-time, always-on detection of various classes of memory error to aid with software debugging to eliminate vulnerabilities arising from memory-unsafe languages.

This option enables the support for the Memory Tagging Extension at EL0 (i.e. for userspace).

Selecting this option allows the feature to be detected at runtime. Any secondary CPU not implementing this feature will not be allowed a late bring-up.

Userspace binaries that want to use this feature must explicitly opt in. The mechanism for the userspace is described in:

Documentation/arch/arm64/memory-tagging-extension.rst.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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