From nobody Fri Dec 19 17:42:02 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C0671C880B; Sun, 24 Mar 2024 22:46:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711320376; cv=none; b=gWNFsQNBepjUNx/NTCogKJNJLwiRWBwHknwRz5I8ENxK1jRFq/sCWYpZyLGnC6C9YkDy9oWf5gEXLpbi/TfInnOxNQj/3VuKaXPIdwFBMaM737vCBJ47G4L0N9inPm4l00kh0Q1Kzw8bPqKH6ORxCgBkdOauALlCPEa1m4Pj060= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711320376; c=relaxed/simple; bh=RMsiwQfl7cYHKFn8JymDMhMZpp+GCZ0RkLUQJ2lV0CU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RSDaVH7Pmtygkt4AlmvBvCY/WboTpC++Y4S0VYHbs7OuUCmi8ua68+u977PmJbTu2xg1kz4jW1tKdJoune07QSqDR9Vn3bYKcG1ot0MJO+FGDtb2vFyn+Dgi++5J478Z1N1itbVVnJDLqjZHHuXMv3KMkGy0H3K10Rcj3OB1Dg8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Cl6fKrql; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Cl6fKrql" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 659E6C43399; Sun, 24 Mar 2024 22:46:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711320376; bh=RMsiwQfl7cYHKFn8JymDMhMZpp+GCZ0RkLUQJ2lV0CU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Cl6fKrqlUJPLdHoc92cfccCee4mWLDvf+2y1HFmsDr+mjXgEFuLnG4HBis8c0irE8 1GT9DCADdLD/j1iJVCJMC+YFxUxQNW+kPfBho/jI7fDGUlotmKWizHGNS1lwxE7p2m zmtYrP+lo+nywJA/M2U8GXci6Ica/cyHOJ7Ww5R537xWY0uGR4JPOb3xiiRWNSoGhN +Jg+nZC6he5CSm7Giq3vrUxqvM45q8LsuISPaYYi1BUpWPYuKbyU7roBJ9LZlrwjmp 6h0+3v8LEUtFEd51zeBg33N+6QEZqaW8j3Hi0FnobiLpw59AwUTGUCR53MOKHN1WFu ONfAEmjdgDAqg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nikita Zhandarovich , syzbot+d1de830e4ecdaac83d89@syzkaller.appspotmail.com, "Jason A . Donenfeld" , Jiri Pirko , Paolo Abeni , Sasha Levin Subject: [PATCH 6.8 682/715] wireguard: receive: annotate data-race around receiving_counter.counter Date: Sun, 24 Mar 2024 18:34:21 -0400 Message-ID: <20240324223455.1342824-683-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324223455.1342824-1-sashal@kernel.org> References: <20240324223455.1342824-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Nikita Zhandarovich [ Upstream commit bba045dc4d996d03dce6fe45726e78a1a1f6d4c3 ] Syzkaller with KCSAN identified a data-race issue when accessing keypair->receiving_counter.counter. Use READ_ONCE() and WRITE_ONCE() annotations to mark the data race as intentional. BUG: KCSAN: data-race in wg_packet_decrypt_worker / wg_packet_rx_poll write to 0xffff888107765888 of 8 bytes by interrupt on cpu 0: counter_validate drivers/net/wireguard/receive.c:321 [inline] wg_packet_rx_poll+0x3ac/0xf00 drivers/net/wireguard/receive.c:461 __napi_poll+0x60/0x3b0 net/core/dev.c:6536 napi_poll net/core/dev.c:6605 [inline] net_rx_action+0x32b/0x750 net/core/dev.c:6738 __do_softirq+0xc4/0x279 kernel/softirq.c:553 do_softirq+0x5e/0x90 kernel/softirq.c:454 __local_bh_enable_ip+0x64/0x70 kernel/softirq.c:381 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210 spin_unlock_bh include/linux/spinlock.h:396 [inline] ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline] wg_packet_decrypt_worker+0x6c5/0x700 drivers/net/wireguard/receive.c:4= 99 process_one_work kernel/workqueue.c:2633 [inline] ... read to 0xffff888107765888 of 8 bytes by task 3196 on cpu 1: decrypt_packet drivers/net/wireguard/receive.c:252 [inline] wg_packet_decrypt_worker+0x220/0x700 drivers/net/wireguard/receive.c:5= 01 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706 worker_thread+0x525/0x730 kernel/workqueue.c:2787 ... Fixes: a9e90d9931f3 ("wireguard: noise: separate receive counter from send = counter") Reported-by: syzbot+d1de830e4ecdaac83d89@syzkaller.appspotmail.com Signed-off-by: Nikita Zhandarovich Signed-off-by: Jason A. Donenfeld Reviewed-by: Jiri Pirko Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/wireguard/receive.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireguard/receive.c b/drivers/net/wireguard/receiv= e.c index a176653c88616..db01ec03bda00 100644 --- a/drivers/net/wireguard/receive.c +++ b/drivers/net/wireguard/receive.c @@ -251,7 +251,7 @@ static bool decrypt_packet(struct sk_buff *skb, struct = noise_keypair *keypair) =20 if (unlikely(!READ_ONCE(keypair->receiving.is_valid) || wg_birthdate_has_expired(keypair->receiving.birthdate, REJECT_AFTER_TI= ME) || - keypair->receiving_counter.counter >=3D REJECT_AFTER_MESSAGES)) { + READ_ONCE(keypair->receiving_counter.counter) >=3D REJECT_AFTER_MESSAG= ES)) { WRITE_ONCE(keypair->receiving.is_valid, false); return false; } @@ -318,7 +318,7 @@ static bool counter_validate(struct noise_replay_counte= r *counter, u64 their_cou for (i =3D 1; i <=3D top; ++i) counter->backtrack[(i + index_current) & ((COUNTER_BITS_TOTAL / BITS_PER_LONG) - 1)] =3D 0; - counter->counter =3D their_counter; + WRITE_ONCE(counter->counter, their_counter); } =20 index &=3D (COUNTER_BITS_TOTAL / BITS_PER_LONG) - 1; @@ -463,7 +463,7 @@ int wg_packet_rx_poll(struct napi_struct *napi, int bud= get) net_dbg_ratelimited("%s: Packet has invalid nonce %llu (max %llu)\n", peer->device->dev->name, PACKET_CB(skb)->nonce, - keypair->receiving_counter.counter); + READ_ONCE(keypair->receiving_counter.counter)); goto next; } =20 --=20 2.43.0