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c0cb86e1d5
Rather than using the clunky, old, slower wireguard-linux-compat out of tree module, this commit does a patch-by-patch backport of upstream's wireguard to 5.4. This specific backport is in widespread use, being part of SUSE's enterprise kernel, Oracle's enterprise kernel, Google's Android kernel, Gentoo's distro kernel, and probably more I've forgotten about. It's definately the "more proper" way of adding wireguard to a kernel than the ugly compat.h hell of the wireguard-linux-compat repo. And most importantly for OpenWRT, it allows using the same module configuration code for 5.10 as for 5.4, with no need for bifurcation. These patches are from the backport tree which is maintained in the open here: https://git.zx2c4.com/wireguard-linux/log/?h=backport-5.4.y I'll be sending PRs to update this as needed. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> (cherry picked from commit3888fa7880) (cherry picked from commitd540725871) (cherry picked from commit196f3d586f) (cherry picked from commit3500fd7938) (cherry picked from commit23b801d3ba) (cherry picked from commit0c0cb97da7) (cherry picked from commit2a27f6f90a) Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
62 lines
2.4 KiB
Diff
62 lines
2.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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Date: Tue, 19 May 2020 22:49:28 -0600
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Subject: [PATCH] wireguard: noise: read preshared key while taking lock
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commit bc67d371256f5c47d824e2eec51e46c8d62d022e upstream.
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Prior we read the preshared key after dropping the handshake lock, which
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isn't an actual crypto issue if it races, but it's still not quite
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correct. So copy that part of the state into a temporary like we do with
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the rest of the handshake state variables. Then we can release the lock,
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operate on the temporary, and zero it out at the end of the function. In
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performance tests, the impact of this was entirely unnoticable, probably
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because those bytes are coming from the same cacheline as other things
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that are being copied out in the same manner.
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Reported-by: Matt Dunwoodie <ncon@noconroy.net>
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Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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---
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drivers/net/wireguard/noise.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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--- a/drivers/net/wireguard/noise.c
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+++ b/drivers/net/wireguard/noise.c
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@@ -715,6 +715,7 @@ wg_noise_handshake_consume_response(stru
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u8 e[NOISE_PUBLIC_KEY_LEN];
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u8 ephemeral_private[NOISE_PUBLIC_KEY_LEN];
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u8 static_private[NOISE_PUBLIC_KEY_LEN];
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+ u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN];
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down_read(&wg->static_identity.lock);
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@@ -733,6 +734,8 @@ wg_noise_handshake_consume_response(stru
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memcpy(chaining_key, handshake->chaining_key, NOISE_HASH_LEN);
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memcpy(ephemeral_private, handshake->ephemeral_private,
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NOISE_PUBLIC_KEY_LEN);
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+ memcpy(preshared_key, handshake->preshared_key,
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+ NOISE_SYMMETRIC_KEY_LEN);
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up_read(&handshake->lock);
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if (state != HANDSHAKE_CREATED_INITIATION)
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@@ -750,7 +753,7 @@ wg_noise_handshake_consume_response(stru
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goto fail;
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/* psk */
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- mix_psk(chaining_key, hash, key, handshake->preshared_key);
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+ mix_psk(chaining_key, hash, key, preshared_key);
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/* {} */
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if (!message_decrypt(NULL, src->encrypted_nothing,
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@@ -783,6 +786,7 @@ out:
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memzero_explicit(chaining_key, NOISE_HASH_LEN);
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memzero_explicit(ephemeral_private, NOISE_PUBLIC_KEY_LEN);
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memzero_explicit(static_private, NOISE_PUBLIC_KEY_LEN);
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+ memzero_explicit(preshared_key, NOISE_SYMMETRIC_KEY_LEN);
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up_read(&wg->static_identity.lock);
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return ret_peer;
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}
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