From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bsdbackstore.eu (128-116-240-228.dyn.eolo.it [128.116.240.228]) (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 763B020ADC0; Wed, 12 Feb 2025 11:14:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=128.116.240.228 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739358867; cv=none; b=gvgPC+IvEycz+yOsdqs8zN3IjcKFkocsStqe8JfcaLSJaqf4uuiMH54jxcm7ceEuCHZVUgyytHNH/ohKpr9AiPjk1IPAfCHiVbXL1HnlAKWBaHFImqHcuUZASZKFkLslNFzMTuG9QO59fbjeRJ9Cn7SToCGulOvsIaMVYncbzjQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739358867; c=relaxed/simple; bh=5B7QIi0G6ghEIAX/y5gdG7RR1hUGjLPxv/h4dG+E0uE=; h=Mime-Version:Content-Type:Date:Message-Id:Cc:Subject:From:To: References:In-Reply-To; b=KaX1XWou1HtAtOc36o0iK5tcfZqQ6idO20Z/473iWVA0bSO6S0uyOiz+FBuNhvUdqlbnUP9VUxvandC6viVLHMsqD+7ugv8vpgI/CYFlXVLhVqyeAxNR7CgVTk7oH0dQJmjdHztxLWFozg0HHSF66YJmvcYF8tFhQMb0EgTwGYQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bsdbackstore.eu; spf=pass smtp.mailfrom=bsdbackstore.eu; arc=none smtp.client-ip=128.116.240.228 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=bsdbackstore.eu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bsdbackstore.eu Received: from localhost (25.205.forpsi.net [80.211.205.25]) by bsdbackstore.eu (OpenSMTPD) with ESMTPSA id cabaeebe (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Wed, 12 Feb 2025 12:14:22 +0100 (CET) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 12 Feb 2025 12:14:20 +0100 Message-Id: Cc: "mgurtovoy" , "sagi" , "kbusch" , "sashal" , "linux-kernel" , "linux-nvme" , "linux-block" Subject: Re: nvme-tcp: fix a possible UAF when failing to send request From: "Maurizio Lombardi" To: "Maurizio Lombardi" , "zhang.guanghui@cestc.cn" , "chunguang.xu" X-Mailer: aerc References: <2025021015413817916143@cestc.cn> <3f1f7ec3-cb49-4d66-b2b0-57276a6c62f0@nvidia.com> <202502111604342976121@cestc.cn> <202502121747455267343@cestc.cn> In-Reply-To: On Wed Feb 12, 2025 at 11:28 AM CET, Maurizio Lombardi wrote: > On Wed Feb 12, 2025 at 10:47 AM CET, zhang.guanghui@cestc.cn wrote: >> =C2=A0=C2=A0=C2=A0=C2=A0Hi, Thanks. >> =C2=A0=C2=A0=C2=A0=C2=A0I will test this patch, but I am worried whether= it will affect the performance. >> Should we also consider null pointer protection? > > Yes, it will likely affect the performance, just check if it works. > > Probably it could be optimized by just protecting > nvme_tcp_fail_request(), which AFAICT is the only function in the > nvme_tcp_try_send() code that calls nvme_complete_rq(). Something like that, maybe, not tested: diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 841238f38fdd..488edec35a65 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -146,6 +146,7 @@ struct nvme_tcp_queue { =20 struct mutex queue_lock; struct mutex send_mutex; + struct mutex poll_mutex; struct llist_head req_list; struct list_head send_list; =20 @@ -1259,7 +1260,9 @@ static int nvme_tcp_try_send(struct nvme_tcp_queue *q= ueue) } else if (ret < 0) { dev_err(queue->ctrl->ctrl.device, "failed to send request %d\n", ret); + mutex_lock(&queue->poll_mutex); nvme_tcp_fail_request(queue->request); + mutex_unlock(&queue->poll_mutex); nvme_tcp_done_send_req(queue); } out: @@ -1397,6 +1400,7 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nct= rl, int qid) kfree(queue->pdu); mutex_destroy(&queue->send_mutex); mutex_destroy(&queue->queue_lock); + mutex_destroy(&queue->poll_mutex); } =20 static int nvme_tcp_init_connection(struct nvme_tcp_queue *queue) @@ -1710,6 +1714,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nct= rl, int qid, init_llist_head(&queue->req_list); INIT_LIST_HEAD(&queue->send_list); mutex_init(&queue->send_mutex); + mutex_init(&queue->poll_mutex); INIT_WORK(&queue->io_work, nvme_tcp_io_work); =20 if (qid > 0) @@ -2660,7 +2665,9 @@ static int nvme_tcp_poll(struct blk_mq_hw_ctx *hctx, = struct io_comp_batch *iob) set_bit(NVME_TCP_Q_POLLING, &queue->flags); if (sk_can_busy_loop(sk) && skb_queue_empty_lockless(&sk->sk_receive_queu= e)) sk_busy_loop(sk, true); + mutex_lock(&queue->poll_mutex); nvme_tcp_try_recv(queue); + mutex_unlock(&queue->poll_mutex); clear_bit(NVME_TCP_Q_POLLING, &queue->flags); return queue->nr_cqe; }