Arm CPUs Hit By Straight Line Speculation Vulnerability, LLVM Adds Initial Mitigation

[phoronix]

Phoronix: Arm CPUs Hit By Straight Line Speculation Vulnerability, LLVM Adds Initial Mitigation

While Intel's CrossTalk/SRBDS vulnerability dominated the conversation on Tuesday, Arm quietly revealed a new speculative execution vulnerability of its own called Straight Line Speculation...

http://www.phoronix.com/scan.php?page=news_item&px=Arm-Straight-Line-Speculation

[Raka555]

Wonder how long before we start seeing the AMD vulnerabilities ...

[aht0]

Wonder how long before we start seeing the AMD vulnerabilities ...

You can be sure that Intel is pouring support into groups researching AMD CPU's for hardware vulnerabilities..

[andrei_me]

How will this affect Amazon ARM thing?

[Vistaus]

No, no, no. According to Intel haters, only Intel has vulnerabilities and all others are 100% safe. I call fake news.

(just kidding )

[hotaru]

Due to performance costs involved, Arm hasn't yet endorsed enabling such compiler mitigations by default and encourages compiler developers to look at the possibility of per-function overrides and similar options.

according to the whitepaper, there shouldn't be much performance cost at all:

While a DSB+ISB sequence is expected to have a significantly greater impact on performance than an SB if architecturally executed, in many of the cases outlined in this document the DSB+ISB sequence is not architecturally executed and should have no direct impact on performance save for a reduction in code density. Secondary effects may include marginally increased pressures on the instruction caches and branch predictors.