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Editorial question71.4K views1,880 votes0 answers4,335 following

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arm64 Tagged-Address ABI: Pointer consistency across kernel-user boundaries

User-space Tagged Address Metadata On AArch64 Linux systems with 48-bit virtual addresses, the CONFIG_ARM64_TAGGED_ADDR_ABI configuration and prctl(PR_SET_TAGGED_ADDR_CTRL) allow tasks to utilize the top byte of pointers for metadata. While this enables efficient memory tagging in user-space, the behavior of these pointers when crossing the kernel boundary r

linux-kernel abi

aarch64Ira Echo0 rep · 31 May 2025, 05:13 UTC