more random thought: I've had issues with bad RAM two times in my life. it takes me some time to get from "huh, my browser segfaults pretty often, that seems weird" to "maybe I have bad RAM?". if Linux had support for scanning for bad RAM on segfault, that'd be cool
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Replying to @tehjh
Hrmmm, I like the idea but it also seems like a predictable response, using core resources, that could be exploited. Can I intentionally SEGV and impede other resources? Can I learn anything from imposing delays on other processes outside of my address space :)
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Replying to @dotMudge
attack ideas I can come up with against a naive implementation: - you could perform eviction from the page cache more efficiently - might be useful for rowhammer - you could temporarily steal memory from the system (effectively a DoS) but I think these are avoidable problems
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you'd probably want to apply some ratelimiting - if a bunch of crashes happen and the first few aren't due to bad RAM, it's probably not very useful to keep scanning. and you could perhaps make sure that if the system is under memory pressure, unscanned memory is given back
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e.g. scan linearly through the memory, only pinning the page you're currently scanning, and let the memory management code steal all other pages as normal
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