[$] The Arm64 memory tagging extension in Linux

One of the first features merged for the 5.10 kernel development cycle wassupport for theArm v8.5 memory tagging extension [PDF]. By adding a "key" value topointers, this mechanism enables the automated detection of a wide range ofmemory-safety issues. The result should be safer and more secure code -once support for the feature shows up in actual hardware.