linux-kernel - Re: Re: nvme-tcp: fix a possible UAF when failing to send request

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Message-ID: <2025032817241899538928@cestc.cn>
Date: Fri, 28 Mar 2025 17:24:19 +0800
From: "zhang.guanghui@...tc.cn" <zhang.guanghui@...tc.cn>
To: "Maurizio Lombardi" <mlombard@...backstore.eu>, 
	sagi <sagi@...mberg.me>, 
	mgurtovoy <mgurtovoy@...dia.com>, 
	kbusch <kbusch@...nel.org>, 
	sashal <sashal@...nel.org>, 
	chunguang.xu <chunguang.xu@...pee.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-nvme <linux-nvme@...ts.infradead.org>, 
	linux-block <linux-block@...r.kernel.org>
Subject: Re: Re: nvme-tcp: fix a possible UAF when failing to send request

Hi, 

      So far,  the UAF issue have not been occcurred during testing this patch in the same situation. 
Additionally, the patch triggers a compilation warning,  nvme_tcp_fail_request is declared but not defined, please also review.  

Thanks 




zhang.guanghui@...tc.cn



 



发件人： Maurizio Lombardi



发送时间： 2025-03-11 18:52



收件人： zhang.guanghui@...tc.cn; sagi; mgurtovoy; kbusch; sashal; chunguang.xu



抄送： linux-kernel; linux-nvme; linux-block



主题： Re: nvme-tcp: fix a possible UAF when failing to send request【请注意，邮件由sagigrim@...il.com代发】



On Fri Mar 7, 2025 at 11:10 AM CET, zhang.guanghui@...tc.cn wrote:



>



> Hi



>



>         After testing this patch,   sending request failure occurred,   unfortunately, the issue still persists.



 



Maybe I am completely wrong but I am still quite convinced that the problem here



is that, despite the nvme_tcp_try_send() failure, the target sends a response capsule



for the command, leading to a double-completion in the host.



 



Sagi, what about taking this patch: https://lore.kernel.org/linux-nvme/20250306160322.1370300-2-mlombard@redhat.com/T/#u



and do a step further by not completing the request, leaving the error



recovery handler the task of cleaning everything up?



 



 



diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c



index 327f3f2f5399..72c1d7948386 100644



--- a/drivers/nvme/host/tcp.c



+++ b/drivers/nvme/host/tcp.c



@@ -1328,8 +1328,8 @@ static int nvme_tcp_try_send(struct nvme_tcp_queue *queue)



} else if (ret < 0) {



dev_err(queue->ctrl->ctrl.device,



"failed to send request %d\n", ret);



- nvme_tcp_fail_request(queue->request);



nvme_tcp_done_send_req(queue);



+ nvme_tcp_error_recovery(&queue->ctrl->ctrl);



}



out:



memalloc_noreclaim_restore(noreclaim_flag);



 



 



Maurizio