The 64-bit ARM architecture code will support several new features with the in-development Linux 5.7 kernel. Highlights of the 64-bit ARM (AArch64 / ARM64) code for Linux 5.7 include:
- In-kernel pointer authentication is now supported. Back in 2018 added to the kernel was pointer authentication support but only exposed for user-space usage. As explained back then, "Pointer authentication can be supported by ARMv8.3 hardware and newer to allow for signing and authenticating of pointers against secret keys. The purpose of this pointer authentication is to mitigate ROP attacks and other potential buffer-overrun-style attacks." Now with Linux 5.7 the ARMv8.3+ pointer authentication support also works within the kernel.