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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: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jason A. Donenfeld 2022-03-29 21:31:25 -04:00 committed by Jakub Kicinski
parent ec59f128a9
commit ca93ca2340
1 changed files with 7 additions and 19 deletions
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26
tools/testing/selftests/wireguard/qemu/init.c
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@ -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();