On 23/03/2022 03.50, Jason A. Donenfeld wrote:
> - Since these seeding shell scripts have always been broken, because
> this is how the rng has always been, rather than trying to bolt on a
> very imperfect fix in the kernel for something that never worked
> right, we could suggest shell scripts take the path that I implemented
> for systemd:
> https://github.com/systemd/systemd/commit/da2862ef06f22fc8d31dafced6d2d6dc14f2ee0b
> In shell, this would look like:
>
> #!/bin/bash
> cat seedfile > /dev/urandom
> { cat seedfile; head -c 32 /dev/urandom; } | sha256sum | cut -d ' ' -f 1 > seedfile
Maybe stating the obvious, but in the interest of preventing
proliferation of more broken shell scripts: The tail of the above should
be spelled
... > seedfile.tmp && mv seedfile.tmp seedfile
or seedfile would be truncated before cat had a chance to read it.
Rasmus