The supposed Spectre mitigation (ELFbac) is nonsense because it assumes your data that needs to be protected is in global variables. *sigh* academics...https://twitter.com/YourAnonRiot/status/1021507680504930304 …
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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Rich Felker Retweeted Anonymous 🐾 🎗️ 🏴
The supposed Spectre mitigation (ELFbac) is nonsense because it assumes your data that needs to be protected is in global variables. *sigh* academics...https://twitter.com/YourAnonRiot/status/1021507680504930304 …
Rich Felker added,
It needs the data in a separate ELF section (which may be user defined or you could use a linker script) and a memory access policy for this section - not strictly global vars.
Data in a section is inherently a singleton aka global var. It doesn't matter how you created it. The actual data that needs protection all has allocated and automatic (stack) storage.
If your proposal for mitigating Spectre is to go back to using global variables for everything, that's a complete non-starter.
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