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cyphar
on Dec 21, 2019
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On Linux's Random Number Generation
Funnily enough, the kernel
does
trust RDRAND (for fetching a single-integer "random enough" value[1]). That's why WireGuard had a DoS bug on those chips until they patched around it to use the proper CSPRNG after a few failed attempts.
[1]:
https://elixir.bootlin.com/linux/v5.4.5/source/drivers/char/...
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[1]: https://elixir.bootlin.com/linux/v5.4.5/source/drivers/char/...