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Languages & runtimes · #aarch64
A diagnostic guide for resolving ARMv8.5 Memory Tagging Extension (MTE) tag-check faults on AArch64, covering ESR analysis, pointer tag loss, and silicon errata.
Learn how to implement ARM64 Memory Tagging Extension (MTE) to detect buffer overflows and use-after-free errors using hardware-level tag validation.
Learn how ARMv8.3‑A Pointer Authentication (PAC) signs pointers to stop return‑oriented programming attacks, how to enable it with compiler flags, and how to verify support on your hardware.
A diagnostic guide for resolving ARM64 Memory Tagging Extension (MTE) faults, covering hardware verification, kernel configuration, and compiler alignment requirements.
Determine the practical limit on distinct tags usable for MTE Determine the practical limit on distinct tags usable for MTE when deploying memory safety checks on aarch64 Linux, considering the 4‑bit tag field and any reserved values. The architecture defines 4 bits, giving 16 possible values; tag 0 is conventionally used to indicate untagged memory, leaving
MMU ↔ PAN Integration In AArch64, the MMU enforces address‑space separation via page tables, while the Privileged Access Never (PAN) bit in the PSTATE_EL1 register aims to block kernel accidental reads of user‑space memory. PAN is only present on ARMv8.1‑A and newer cores, and its effectiveness depends on correct configuration of the PXN bits in each page ta
The UDF (Undefined Instruction) error in ARM64 occurs when the processor encounters an unrecognized or unsupported instruction. This error is deliberately triggered by the UDF opcode ( 0xD65F03C0 ) or invalid instruction encodings, causing a synchronous exception. During development, the UDF instruction is often used to mark unreachable code or debug specifi
Developers need a reliable way to determine at runtime whether their atomic operations are executed using the ARMv8.2‑A Large System Extensions (LSE) instructions or have fallen back to the legacy LDREX/STREX loop, especially on systems that mix CPUs with and without LSE support. While the Linux kernel can optionally disable LSE via a boot parameter or sysct
Goal Determine whether enabling Large Physical Address Extension (LPAE) in aarch64 kernels can reduce page‑fault overhead for memory‑intensive accessibility services such as screen readers or OCR engines. Constraints & Uncertainty LPAE requires hardware support and is disabled by default in many mainstream distributions to preserve compatibility with leg