Linux 6.1 Hardening Retpolines With Ensuring An INT3 After Every Unconditional Jump

phoronix

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Linux 6.1 Hardening Retpolines With Ensuring An INT3 After Every Unconditional Jump

05 October 2022, 06:50 AM

Phoronix: Linux 6.1 Hardening Retpolines With Ensuring An INT3 After Every Unconditional Jump

The x86/core changes for Linux 6.1 have been merged and are headlined by making sure an INT3 instruction is inserted after every unconditional Retpoline jump (JMP) for the Retpolines handling on both Intel and AMD processors...

Linux 6.1 Hardening Retpolines With Ensuring An INT3 After Every Unconditional Jump - Phoronix

https://www.phoronix.com/news/Linux-6.1-Retpolines-INT3

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RealNC

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05 October 2022, 09:42 AM

I noticed that CONFIG_SLS is off by default in the kernel. The option is documented as:

Compile the kernel with straight-line-speculation options to guard against straight line speculation. The kernel image might be slightly larger.

Is this what we're talking about here? And does someone know the reason why it's disabled by default?

Last edited by RealNC; 05 October 2022, 09:44 AM.
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