20.11.2019 13:58, Stephan Müller пишет:
Or another idea and apologies if I restart this conversation as there was
already a discussion around it: what about extending the getrandom(2) call
instead of adding a device file?
What about adding yet another flag to getrandom: GRND_TRUERANDOM and process
it as follows:
if (flags & ~(GRND_NONBLOCK|GRND_RANDOM|GRND_INSECURE|
GRND_TRUERANDOM))
return -EINVAL;
//From Andy's tree
/*
* Requesting insecure and blocking randomness at the same time makes
* no sense.
*/
if ((flags & (GRND_INSECURE|GRND_RANDOM)) == (GRND_INSECURE|
GRND_RANDOM))
return -EINVAL;
/* We only allow GRND_TRUERANDOM by itself or with NONBLOCK */
if (! ((flags & GRND_TRUERANDOM) &&
((flags == GRND_TRUERANDOM) ||
(flags == GRND_TRUERANDOM | GRND_NONBLOCK))))
return -EINVAL;
if (flags & GRND_TRUERANDOM) {
... do the TRNG processing ...
... may return -ENOPNOTSUPP if no TRNG available ...
}
This would totally miss the point of adding a device node: UNIX
permissions that don't allow "others" to read and deplete "true" random
numbers.
--
Alexander E. Patrakov
