From patchwork Tue Feb 4 00:29:52 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Luczaj X-Patchwork-Id: 13958447 X-Patchwork-Delegate: kuba@kernel.org Received: from mailtransmit04.runbox.com (mailtransmit04.runbox.com [185.226.149.37]) (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 C3FAB35967 for ; Tue, 4 Feb 2025 00:30:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.226.149.37 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738629047; cv=none; b=t4JTJ4rXKcVIxV+nXo+LcoHMCg9PeEI22bXzp9UUVl2Gdg4Hbj3uod2ma/E2dqqm9KB6tQdG0VozzvQZnvIsQiO0dFwt0tA0frwooXDy3LOWyTieGxHFcou2iY2YLkAJqcugFQ967Krs29yeWUU+LAPAogMf7knCeVNgz7DwpGc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738629047; c=relaxed/simple; bh=a23O4pr4xHgL7lf78s0SidMq4UAVSB4Ut3dRSrV86fQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=mOMxpWTBUFUyTeJh+R6j2eyKon0BLgLCC6zhUY07BoMqRqVAEBQSt0iOD6pR9yPI1tmk/xEloKIUJ2QYanQUO5zdQ76c8I2gUJUeRlQQfOnO9cWC5/WvVWJ4A/LYu4lWf0pUaCoYVHXcIvZFPWXLBe6nL9UyCkvpGl4hxSmeqTQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=rbox.co; spf=pass smtp.mailfrom=rbox.co; dkim=pass (2048-bit key) header.d=rbox.co header.i=@rbox.co header.b=fbPObwOA; arc=none smtp.client-ip=185.226.149.37 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=rbox.co Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rbox.co Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rbox.co header.i=@rbox.co header.b="fbPObwOA" Received: from mailtransmit03.runbox ([10.9.9.163] helo=aibo.runbox.com) by mailtransmit04.runbox.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1tf6pp-0035LM-PF; Tue, 04 Feb 2025 01:30:37 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=rbox.co; s=selector1; h=Cc:To:In-Reply-To:References:Message-Id: Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date:From; bh=pwAHNqSfYtODufEUZzYvZd2TMQYo1ch2LMFopgwTdnc=; b=fbPObwOAuQDwOzie418PomwO7x PElL9Hhi8RFIYjXbTA0ruvoGBE3iZMFoPMDMinl/Ka3mxkVj3KilguH0YDhRv4CHQZtuuk1fEPbYR GXlEkgn5PXZNEDiQ+toQuRX+SP3JobOqFTLndp/bGAdR0IP/5UZeV4ts7xl76SffSVGXgbsQbsbZX Wt6We88jTEBOycdIF6Ib0peG2WutY9BeTyskIPubVzsU4UBaeF15GL5/1arMgkHaywln69NDImiEM 21NFGsxNPIkwOy8VrxNVRhBpRhy02V0DAz+pIrGEGzX//KGlhTFunLdg50vcRsBZ1JvpeMbNoh54i 3L5scc+g==; Received: from [10.9.9.73] (helo=submission02.runbox) by mailtransmit03.runbox with esmtp (Exim 4.86_2) (envelope-from ) id 1tf6pp-0003rD-BK; Tue, 04 Feb 2025 01:30:37 +0100 Received: by submission02.runbox with esmtpsa [Authenticated ID (604044)] (TLS1.2:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.93) id 1tf6pY-006aWc-0m; Tue, 04 Feb 2025 01:30:20 +0100 From: Michal Luczaj Date: Tue, 04 Feb 2025 01:29:52 +0100 Subject: [PATCH net 1/2] vsock: Orphan socket after transport release Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250204-vsock-linger-nullderef-v1-1-6eb1760fa93e@rbox.co> References: <20250204-vsock-linger-nullderef-v1-0-6eb1760fa93e@rbox.co> In-Reply-To: <20250204-vsock-linger-nullderef-v1-0-6eb1760fa93e@rbox.co> To: Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: netdev@vger.kernel.org, Michal Luczaj , syzbot+9d55b199192a4be7d02c@syzkaller.appspotmail.com X-Mailer: b4 0.14.2 X-Patchwork-Delegate: kuba@kernel.org During socket release, sock_orphan() is called without considering that it sets sk->sk_wq to NULL. Later, if SO_LINGER is enabled, this leads to a null pointer dereferenced in virtio_transport_wait_close(). Orphan the socket only after transport release. Partially reverts the 'Fixes:' commit. KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] lock_acquire+0x19e/0x500 _raw_spin_lock_irqsave+0x47/0x70 add_wait_queue+0x46/0x230 virtio_transport_release+0x4e7/0x7f0 __vsock_release+0xfd/0x490 vsock_release+0x90/0x120 __sock_release+0xa3/0x250 sock_close+0x14/0x20 __fput+0x35e/0xa90 __x64_sys_close+0x78/0xd0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Reported-by: syzbot+9d55b199192a4be7d02c@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=9d55b199192a4be7d02c Fixes: fcdd2242c023 ("vsock: Keep the binding until socket destruction") Signed-off-by: Michal Luczaj --- net/vmw_vsock/af_vsock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 075695173648d3a4ecbd04e908130efdbb393b41..06250bb9afe2f253e96130b73554aae9151aaac1 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -824,13 +824,14 @@ static void __vsock_release(struct sock *sk, int level) */ lock_sock_nested(sk, level); - sock_orphan(sk); + sock_set_flag(sk, SOCK_DEAD); if (vsk->transport) vsk->transport->release(vsk); else if (sock_type_connectible(sk->sk_type)) vsock_remove_sock(vsk); + sock_orphan(sk); sk->sk_shutdown = SHUTDOWN_MASK; skb_queue_purge(&sk->sk_receive_queue);