Linux Developers Continue Discussing "SLS" Mitigation For The Kernel

[phoronix]

Phoronix: Linux Developers Continue Discussing "SLS" Mitigation For The Kernel

Disclosed by Arm last summer was the Straight Line Speculation (SLS) vulnerability and they were quick to introduce new safeguards against SLS in the GCC and LLVM compilers. The compiler-based mitigations to straight-line speculation involves adding speculation barrier sequences around the vulnerable instructions to prevent speculatively executing instructions around changes in control flow. While compiler developers were quick to add the options, so far the Linux kernel developers are in disagreement still over its importance and the proposed patches that would flip on this option when compiling the ARM Linux kernel...

https://www.phoronix.com/scan.php?page=news_item&px=Linux-SLS-Arm-v6-Patches

[elatllat]

They should add it to vulnerabilities first;

C4> cd /sys/devices/system/cpu/vulnerabilities/ && grep . *
itlb_multihit:Not affected
l1tf:Not affected
mds:Not affected
meltdown:Not affected
spec_store_bypass:Not affected
spectre_v1:Mitigation: __user pointer sanitization
spectre_v2:Not affected
srbds:Not affected
tsx_async_abort:Not affected
C4> uname -r
5.4.103-rc1-dirty