Commit 81e69df3 authored Jul 14, 2018 by Theodore Ts'o

random: mix rdrand with entropy sent in from userspace

Fedora has integrated the jitter entropy daemon to work around slow
boot problems, especially on VM's that don't support virtio-rng:

    https://bugzilla.redhat.com/show_bug.cgi?id=1572944



It's understandable why they did this, but the Jitter entropy daemon
works fundamentally on the principle: "the CPU microarchitecture is
**so** complicated and we can't figure it out, so it *must* be
random".  Yes, it uses statistical tests to "prove" it is secure, but
AES_ENCRYPT(NSA_KEY, COUNTER++) will also pass statistical tests with
flying colors.

So if RDRAND is available, mix it into entropy submitted from
userspace.  It can't hurt, and if you believe the NSA has backdoored
RDRAND, then they probably have enough details about the Intel
microarchitecture that they can reverse engineer how the Jitter
entropy daemon affects the microarchitecture, and attack its output
stream.  And if RDRAND is in fact an honest DRNG, it will immeasurably
improve on what the Jitter entropy daemon might produce.

This also provides some protection against someone who is able to read
or set the entropy seed file.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
Cc: Arnd Bergmann <arnd@arndb.de>

parent 1e4b044d

drivers/char/random.c

+9 −1

Original line number	Diff line number	Diff line
		@@ -1895,14 +1895,22 @@ static int
		write_pool(struct entropy_store r, const char __user buffer, size_t count)
		{
		size_t bytes;
		__u32 buf[16];
		__u32 t, buf[16];
		const char __user *p = buffer;

		while (count > 0) {
		int b, i = 0;

		bytes = min(count, sizeof(buf));
		if (copy_from_user(&buf, p, bytes))
		return -EFAULT;

		for (b = bytes ; b > 0 ; b -= sizeof(__u32), i++) {
		if (!arch_get_random_int(&t))
		break;
		buf[i] ^= t;
		}

		count -= bytes;
		p += bytes;

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