[PATCH v8] seedrng: import SeedRNG utility for kernel RNG seed files

[Bernhard Reutner-Fischer]

On Tue, 19 Apr 2022 12:24:05 +0200
"Jason A. Donenfeld" <Jason at zx2c4.com> wrote:

> On Tue, Apr 19, 2022 at 11:33 AM Bernhard Reutner-Fischer
> <rep.dot.nop at gmail.com> wrote:
> > I was not refering to the startup scripts but to the possibility that
> > we read data from the path /dev/random, close the fd and only later
> > open it again for issuing the ioctl. The first read could easily hit a
> > file with e.g. c 1 5, i.e. zero to inject non-random data into the pool.
> > This would be avoided if we'd open random only once (and even ensure it
> > really is the random chardev) and issue the ioctl on this very fd.  
> 
> If an unprivileged process can modify files in /dev, all bets are off.

If you consider all this a non-issue then the stat does make no sense
and we can ignore the possibility that the device files changes from
under us, sure.

thanks,