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UPSTREAM: wireguard: noise: read preshared key while taking lock

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Prior we read the preshared key after dropping the handshake lock, which
isn't an actual crypto issue if it races, but it's still not quite
correct. So copy that part of the state into a temporary like we do with
the rest of the handshake state variables. Then we can release the lock,
operate on the temporary, and zero it out at the end of the function. In
performance tests, the impact of this was entirely unnoticable, probably
because those bytes are coming from the same cacheline as other things
that are being copied out in the same manner.

Reported-by: Matt Dunwoodie <ncon@noconroy.net>
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit bc67d371256f5c47d824e2eec51e46c8d62d022e)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I2166d5fe2f112f66372021647c9f02446c8a5c8f
This commit is contained in:
Jason A. Donenfeld 2020-05-19 22:49:28 -06:00 • committed by Alexander Martinz
commit a5fe2d62fe
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GPG key ID: CF15BDD9A321A9B2
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireguard/noise.c
View file

@ -748,6 +748,7 @@ wg_noise_handshake_consume_response(struct message_handshake_response *src,
u8 e[NOISE_PUBLIC_KEY_LEN];
u8 ephemeral_private[NOISE_PUBLIC_KEY_LEN];
u8 static_private[NOISE_PUBLIC_KEY_LEN];
u8 preshared_key[NOISE_SYMMETRIC_KEY_LEN];
down_read(&wg->static_identity.lock);
@ -766,6 +767,8 @@ wg_noise_handshake_consume_response(struct message_handshake_response *src,
memcpy(chaining_key, handshake->chaining_key, NOISE_HASH_LEN);
memcpy(ephemeral_private, handshake->ephemeral_private,
NOISE_PUBLIC_KEY_LEN);
memcpy(preshared_key, handshake->preshared_key,
NOISE_SYMMETRIC_KEY_LEN);
up_read(&handshake->lock);
if (state != HANDSHAKE_CREATED_INITIATION)
@ -783,7 +786,7 @@ wg_noise_handshake_consume_response(struct message_handshake_response *src,
goto fail;
/* psk */
mix_psk(chaining_key, hash, key, handshake->preshared_key);
mix_psk(chaining_key, hash, key, preshared_key);
/* {} */
if (!message_decrypt(NULL, src->encrypted_nothing,
@ -816,6 +819,7 @@ out:
memzero_explicit(chaining_key, NOISE_HASH_LEN);
memzero_explicit(ephemeral_private, NOISE_PUBLIC_KEY_LEN);
memzero_explicit(static_private, NOISE_PUBLIC_KEY_LEN);
memzero_explicit(preshared_key, NOISE_SYMMETRIC_KEY_LEN);
up_read(&wg->static_identity.lock);
return ret_peer;
}