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CONFIG_CALL_DEPTH_TRACKING: Mitigate RSB underflow with call depth tracking

General informations

The Linux kernel configuration item CONFIG_CALL_DEPTH_TRACKING:

Help text

Compile the kernel with call depth tracking to mitigate the Intel SKL Return-Speculation-Buffer (RSB) underflow issue. The mitigation is off by default and needs to be enabled on the kernel command line via the retbleed=stuff option. For non-affected systems the overhead of this option is marginal as the call depth tracking is using run-time generated call thunks in a compiler generated padding area and call patching. This increases text size by ~5%. For non affected systems this space is unused. On affected SKL systems this results in a significant performance gain over the IBRS mitigation.



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