Jeff Dike wrote:
> Can you actually dd bits out of the host's /dev/random?
Yes, that was one of the first things I tried, and I've not
seen any problems with that. I also tried a short program
that did:
int main() {
uint32_t data;
int fd = open("/dev/random", O_RDONLY);
if (fd == -1) { perror("Error opening device"); exit(1); }
while (1) {
if (read(fd, &data, sizeof(data)) == sizeof(data)) {
putchar('.'); fflush(stdout);
}
usleep(10000);
}
}
It seems that I can run that pretty much indefinitely
without it blocking. Yes, it reduces the host entropy, but
not so much that I see values of
/proc/sys/kernel/random/entropy_avail below 1000.
Richard
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