CONFIG_ARM64_USER_VA_BITS_52: 52-bit (user)

General informations

The Linux kernel configuration item CONFIG_ARM64_USER_VA_BITS_52:

• prompt: 52-bit (user)
• type: bool
• depends on: CONFIG_ARM64_64K_PAGES && ( CONFIG_ARM64_PAN || ! CONFIG_ARM64_SW_TTBR0_PAN )
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.0–5.3

Help text

Enable 52-bit virtual addressing for userspace when explicitly requested via a hint to mmap(). The kernel will continue to use 48-bit virtual addresses for its own mappings.

NOTE: Enabling 52-bit virtual addressing in conjunction with ARMv8.3 Pointer Authentication will result in the PAC being reduced from 7 bits to 3 bits, which may have a significant impact on its susceptibility to brute-force attacks.

If unsure, select 48-bit virtual addressing instead.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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