Commit ca93ca23 authored by Jason A. Donenfeld's avatar Jason A. Donenfeld Committed by Jakub Kicinski
Browse files

wireguard: selftests: simplify RNG seeding 



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: default avatarJason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent ec59f128

tools/testing/selftests/wireguard/qemu/init.c

+7 −19
Original line number Diff line number Diff line
@@ -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();