@@ -56,26 +56,14 @@ static void print_banner(void)
static void seed_rng(void)
{
- int fd;
- struct {
- int entropy_count;
- int buffer_size;
- unsigned char buffer[256];
- } entropy = {
- .entropy_count = sizeof(entropy.buffer) * 8,
- .buffer_size = sizeof(entropy.buffer),
- .buffer = "Adding real entropy is not actually important for these tests. Don't try this at home, kids!"
- };
+ int bits = 256, fd;
- if (mknod("/dev/urandom", S_IFCHR | 0644, makedev(1, 9)))
- panic("mknod(/dev/urandom)");
- fd = open("/dev/urandom", O_WRONLY);
+ pretty_message("[+] Fake seeding RNG...");
+ fd = open("/dev/random", O_WRONLY);
if (fd < 0)
- panic("open(urandom)");
- for (int i = 0; i < 256; ++i) {
- if (ioctl(fd, RNDADDENTROPY, &entropy) < 0)
- panic("ioctl(urandom)");
- }
+ panic("open(random)");
+ if (ioctl(fd, RNDADDTOENTCNT, &bits) < 0)
+ panic("ioctl(RNDADDTOENTCNT)");
close(fd);
}
@@ -270,10 +258,10 @@ static void check_leaks(void)
int main(int argc, char *argv[])
{
- seed_rng();
ensure_console();
print_banner();
mount_filesystems();
+ seed_rng();
kmod_selftests();
enable_logging();
clear_leaks();
The seed_rng() function was written to work across lots of old kernels, back when WireGuard used a big compatibility layer. Now that things have evolved, we can vastly simplify this, by just marking the RNG as seeded. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- tools/testing/selftests/wireguard/qemu/init.c | 26 +++++-------------- 1 file changed, 7 insertions(+), 19 deletions(-)