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Keeping secrets in memfd areas

Keeping secrets in memfd areas

Posted Feb 14, 2020 15:34 UTC (Fri) by Funcan (guest, #44209)
Parent article: Keeping secrets in memfd areas

Does allowing uncached memory access to userspace make rowhammer easier?

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Keeping secrets in memfd areas

Posted Feb 14, 2020 15:52 UTC (Fri) by zlynx (guest, #2285) [Link]

I am fairly sure that user-space programs on x86 can already bypass cache using the non-temporal store instructions.

Keeping secrets in memfd areas

Posted Feb 14, 2020 17:02 UTC (Fri) by hansendc (subscriber, #7363) [Link]

Theoretically. But, rowhammer is also most effective when you can get access to *lots* of memory so you can find flips of value between pages with special physical relationships on the media. This mechanism is at least limited by RLIMIT_MEMLOCK, which means that normal users can't normally get large swaths of it.


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