<a href="https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7055.html" rel="nofollow">https://www.amd.com/en/resources/product-security/bulletin/a...
The OP says they discovered this on a Zen 2, which is not covered by that bulletin (?)[edit to add]: Also, the bulletin is solely about RDSEED zeros, whereas the OP is also reporting RDRAND zeroes.
Older AMD processors had issues as well:<a href="https://github.com/systemd/systemd/pull/12536/commits/1c53d4a070edbec8ad2d384ba0014d0eb6bae077" rel="nofollow">https://github.com/systemd/systemd/pull/12536/commits/1c53d4...
That one's insidious!I found the thread about it,<a href="https://news.ycombinator.com/item?id=19848953">https://news.ycombinator.com/item?id=19848953Yikes at this: "I am so glad I resisted pressure from engineers working at Intel to let /dev/random in Linux rely blindly on the output of the RDRAND instructure." -Theodore Ts'o (2013)
349ru3h4f03 · · focus · HN ↗
peri-cl · · focus · HN ↗
[edit to add]: Also, the bulletin is solely about RDSEED zeros, whereas the OP is also reporting RDRAND zeroes.
ciupicri · · focus · HN ↗
<a href="https://github.com/systemd/systemd/pull/12536/commits/1c53d4a070edbec8ad2d384ba0014d0eb6bae077" rel="nofollow">https://github.com/systemd/systemd/pull/12536/commits/1c53d4...
peri-cl · · focus · HN ↗
I found the thread about it,
<a href="https://news.ycombinator.com/item?id=19848953">https://news.ycombinator.com/item?id=19848953
Yikes at this: "I am so glad I resisted pressure from engineers working at Intel to let /dev/random in Linux rely blindly on the output of the RDRAND instructure." -Theodore Ts'o (2013)