ARM's Work in Linux (Kernel)
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Energy Model Management Framework Queued For Linux 4.21
A new framework queued for introduction with the Linux 4.21 kernel is the ARM-developed Energy Model Management Framework.
With different hardware and drivers exposing the processor/system energy consumption in different manners, the Energy Model Management Framework tries to provide a standardized way of accessing the power values for each performance domain in a system. This can help kernel drivers/schedulers and other code that could make smarter decisions based upon current energy use be able to do so via this standardized framework for acquiring the power information on capable systems.
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ARM's AArch64 Adding Pointer Authentication Support To The Linux 4.21 Kernel
The 64-bit ARM architecture code (a.k.a ARM64 / AArch64) with the Linux 4.21 kernel is seeing pointer authentication added as a new security feature.
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. This ARM64_PTR_AUTH functionality will enable pointer authentication for all user-space processes and the presence of supported hardware is determined at run-time. ARM developers have been working on the plumbing for this Linux kernel support for it the past year.
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