diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch b/target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch new file mode 100644 index 0000000000..309fe36198 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch @@ -0,0 +1,66 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:33 +0200 +Subject: [PATCH] wireguard: use synchronize_net rather than synchronize_rcu + +commit 24b70eeeb4f46c09487f8155239ebfb1f875774a upstream. + +Many of the synchronization points are sometimes called under the rtnl +lock, which means we should use synchronize_net rather than +synchronize_rcu. Under the hood, this expands to using the expedited +flavor of function in the event that rtnl is held, in order to not stall +other concurrent changes. + +This fixes some very, very long delays when removing multiple peers at +once, which would cause some operations to take several minutes. + +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/peer.c | 6 +++--- + drivers/net/wireguard/socket.c | 2 +- + 2 files changed, 4 insertions(+), 4 deletions(-) + +--- a/drivers/net/wireguard/peer.c ++++ b/drivers/net/wireguard/peer.c +@@ -88,7 +88,7 @@ static void peer_make_dead(struct wg_pee + /* Mark as dead, so that we don't allow jumping contexts after. */ + WRITE_ONCE(peer->is_dead, true); + +- /* The caller must now synchronize_rcu() for this to take effect. */ ++ /* The caller must now synchronize_net() for this to take effect. */ + } + + static void peer_remove_after_dead(struct wg_peer *peer) +@@ -160,7 +160,7 @@ void wg_peer_remove(struct wg_peer *peer + lockdep_assert_held(&peer->device->device_update_lock); + + peer_make_dead(peer); +- synchronize_rcu(); ++ synchronize_net(); + peer_remove_after_dead(peer); + } + +@@ -178,7 +178,7 @@ void wg_peer_remove_all(struct wg_device + peer_make_dead(peer); + list_add_tail(&peer->peer_list, &dead_peers); + } +- synchronize_rcu(); ++ synchronize_net(); + list_for_each_entry_safe(peer, temp, &dead_peers, peer_list) + peer_remove_after_dead(peer); + } +--- a/drivers/net/wireguard/socket.c ++++ b/drivers/net/wireguard/socket.c +@@ -430,7 +430,7 @@ void wg_socket_reinit(struct wg_device * + if (new4) + wg->incoming_port = ntohs(inet_sk(new4)->inet_sport); + mutex_unlock(&wg->socket_update_lock); +- synchronize_rcu(); ++ synchronize_net(); + sock_free(old4); + sock_free(old6); + } |