Avoid overflowing FDSET when using select(2).
There is a problem in the rand_unix.c code when the random seed fd is greater
than or equal to FD_SETSIZE and the FDSET overruns its limit and walks the
stack.
@@ -390,7 +390,7 @@ static int wait_random_seeded(void)
}
/* Open /dev/random and wait for it to be readable */
if ((fd = open(DEVRANDOM_WAIT, O_RDONLY)) != -1) {
- if (DEVRANDM_WAIT_USE_SELECT) {
+ if (DEVRANDM_WAIT_USE_SELECT && fd < FD_SETSIZE) {
FD_ZERO(&fds);
FD_SET(fd, &fds);
while ((r = select(fd + 1, &fds, NULL, NULL, NULL)) < 0
