Michael McConville <mmcconv1 <at> sccs.swarthmore.edu> writes:

>       https://www.hyperelliptic.org/tanja/vortraege/random.pdf

made my day:

“The way RDRAND is being used in kernels <= 3.12.3 allows it to
cancel out the other entropy. See extract buf().”
“if I make RDRAND return [EDX] ^ 0x41414141, /dev/urandom
output will be all ’A’.”

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