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authorJason A. Donenfeld <Jason@zx2c4.com>2020-09-09 13:58:15 +0200
committerJason A. Donenfeld <Jason@zx2c4.com>2020-09-13 01:00:59 +0200
commitec3d7c8d5567fa48e47a97b090a59fad473ae379 (patch)
tree831e212d19b3c4d98480dd91125f8bdbc8c42eab
parentwireguard: noise: take lock when removing handshake entry from table (diff)
downloadwireguard-linux-backport-5.4.y.tar.xz
wireguard-linux-backport-5.4.y.zip
wireguard: peerlookup: take lock before checking hash in replace operationbackport-5.4.y
commit 6147f7b1e90ff09bd52afc8b9206a7fcd133daf7 upstream. Eric's suggested fix for the previous commit's mentioned race condition was to simply take the table->lock in wg_index_hashtable_replace(). The table->lock of the hash table is supposed to protect the bucket heads, not the entires, but actually, since all the mutator functions are already taking it, it makes sense to take it too for the test to hlist_unhashed, as a defense in depth measure, so that it no longer races with deletions, regardless of what other locks are protecting individual entries. This is sensible from a performance perspective because, as Eric pointed out, the case of being unhashed is already the unlikely case, so this won't add common contention. And comparing instructions, this basically doesn't make much of a difference other than pushing and popping %r13, used by the new `bool ret`. More generally, I like the idea of locking consistency across table mutator functions, and this might let me rest slightly easier at night. Suggested-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/wireguard/20200908145911.4090480-1-edumazet@google.com/ 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> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
-rw-r--r--drivers/net/wireguard/peerlookup.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/wireguard/peerlookup.c b/drivers/net/wireguard/peerlookup.c
index e4deb331476b..f2783aa7a88f 100644
--- a/drivers/net/wireguard/peerlookup.c
+++ b/drivers/net/wireguard/peerlookup.c
@@ -167,9 +167,13 @@ bool wg_index_hashtable_replace(struct index_hashtable *table,
struct index_hashtable_entry *old,
struct index_hashtable_entry *new)
{
- if (unlikely(hlist_unhashed(&old->index_hash)))
- return false;
+ bool ret;
+
spin_lock_bh(&table->lock);
+ ret = !hlist_unhashed(&old->index_hash);
+ if (unlikely(!ret))
+ goto out;
+
new->index = old->index;
hlist_replace_rcu(&old->index_hash, &new->index_hash);
@@ -180,8 +184,9 @@ bool wg_index_hashtable_replace(struct index_hashtable *table,
* simply gets dropped, which isn't terrible.
*/
INIT_HLIST_NODE(&old->index_hash);
+out:
spin_unlock_bh(&table->lock);
- return true;
+ return ret;
}
void wg_index_hashtable_remove(struct index_hashtable *table,