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From: Chuck Lever III <chuck.lever@oracle.com>
To: Trond Myklebust <trondmy@hammerspace.com>
Cc: Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: Re: [PATCH v3 01/26] SUNRPC: Move fault injection call sites
Date: Mon, 19 Apr 2021 18:05:42 +0000
Message-ID: <EDDCA320-686C-4A6F-A002-6722028B90FD@oracle.com> (raw)
In-Reply-To: <161885530484.38598.2278426440061934702.stgit@manet.1015granger.net>



> On Apr 19, 2021, at 2:01 PM, Chuck Lever <chuck.lever@oracle.com> wrote:
> 
> I've hit some crashes that occur in the xprt_rdma_inject_disconnect
> path. It appears that, for some provides, rdma_disconnect() can

^provides^providers

> take so long that the transport can disconnect and release its
> hardware resources while rdma_disconnect() is still running,
> resulting in a UAF in the provider.
> 
> The transport's fault injection method may depend on the stability
> of transport data structures. That means it needs to be invoked
> only from contexts that hold the transport write lock.
> 
> Fixes: 4a0682583988 ("SUNRPC: Transport fault injection")
> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
> ---
> net/sunrpc/clnt.c               |    1 -
> net/sunrpc/xprt.c               |    6 ++++--
> net/sunrpc/xprtrdma/transport.c |    6 ++++--
> 3 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> index 612f0a641f4c..c2a01125be1a 100644
> --- a/net/sunrpc/clnt.c
> +++ b/net/sunrpc/clnt.c
> @@ -1799,7 +1799,6 @@ call_allocate(struct rpc_task *task)
> 
> 	status = xprt->ops->buf_alloc(task);
> 	trace_rpc_buf_alloc(task, status);
> -	xprt_inject_disconnect(xprt);
> 	if (status == 0)
> 		return;
> 	if (status != -ENOMEM) {
> diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
> index 691ccf8049a4..d616b93751d8 100644
> --- a/net/sunrpc/xprt.c
> +++ b/net/sunrpc/xprt.c
> @@ -1483,7 +1483,10 @@ bool xprt_prepare_transmit(struct rpc_task *task)
> 
> void xprt_end_transmit(struct rpc_task *task)
> {
> -	xprt_release_write(task->tk_rqstp->rq_xprt, task);
> +	struct rpc_xprt	*xprt = task->tk_rqstp->rq_xprt;
> +
> +	xprt_inject_disconnect(xprt);
> +	xprt_release_write(xprt, task);
> }
> 
> /**
> @@ -1885,7 +1888,6 @@ void xprt_release(struct rpc_task *task)
> 	spin_unlock(&xprt->transport_lock);
> 	if (req->rq_buffer)
> 		xprt->ops->buf_free(task);
> -	xprt_inject_disconnect(xprt);
> 	xdr_free_bvec(&req->rq_rcv_buf);
> 	xdr_free_bvec(&req->rq_snd_buf);
> 	if (req->rq_cred != NULL)
> diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
> index 78d29d1bcc20..09953597d055 100644
> --- a/net/sunrpc/xprtrdma/transport.c
> +++ b/net/sunrpc/xprtrdma/transport.c
> @@ -262,8 +262,10 @@ xprt_rdma_connect_worker(struct work_struct *work)
>  * xprt_rdma_inject_disconnect - inject a connection fault
>  * @xprt: transport context
>  *
> - * If @xprt is connected, disconnect it to simulate spurious connection
> - * loss.
> + * If @xprt is connected, disconnect it to simulate spurious
> + * connection loss. Caller must hold @xprt's send lock to
> + * ensure that data structures and hardware resources are
> + * stable during the rdma_disconnect() call.
>  */
> static void
> xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
> 
> 

--
Chuck Lever




  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 18:01 [PATCH v3 00/26] NFS/RDMA client patches for next Chuck Lever
2021-04-19 18:01 ` [PATCH v3 01/26] SUNRPC: Move fault injection call sites Chuck Lever
2021-04-19 18:05   ` Chuck Lever III [this message]
2021-04-19 18:01 ` [PATCH v3 02/26] SUNRPC: Remove trace_xprt_transmit_queued Chuck Lever
2021-04-19 18:01 ` [PATCH v3 03/26] SUNRPC: Add tracepoint that fires when an RPC is retransmitted Chuck Lever
2021-04-19 18:02 ` [PATCH v3 04/26] xprtrdma: Avoid Receive Queue wrapping Chuck Lever
2021-04-19 18:02 ` [PATCH v3 05/26] xprtrdma: Do not refresh Receive Queue while it is draining Chuck Lever
2021-04-19 18:02 ` [PATCH v3 06/26] xprtrdma: Put flushed Receives on free list instead of destroying them Chuck Lever
2021-04-19 18:02 ` [PATCH v3 07/26] xprtrdma: Improve locking around rpcrdma_rep destruction Chuck Lever
2021-04-23 21:06   ` Trond Myklebust
2021-04-24 17:39     ` Chuck Lever III
2021-04-24 17:59       ` Trond Myklebust
2021-04-19 18:02 ` [PATCH v3 08/26] xprtrdma: Improve commentary around rpcrdma_reps_unmap() Chuck Lever
2021-04-19 18:02 ` [PATCH v3 09/26] xprtrdma: Improve locking around rpcrdma_rep creation Chuck Lever
2021-04-19 18:02 ` [PATCH v3 10/26] xprtrdma: Fix cwnd update ordering Chuck Lever
2021-04-19 18:02 ` [PATCH v3 11/26] xprtrdma: Delete rpcrdma_recv_buffer_put() Chuck Lever
2021-04-19 18:02 ` [PATCH v3 12/26] xprtrdma: rpcrdma_mr_pop() already does list_del_init() Chuck Lever
2021-04-19 18:03 ` [PATCH v3 13/26] xprtrdma: Rename frwr_release_mr() Chuck Lever
2021-04-19 18:03 ` [PATCH v3 14/26] xprtrdma: Clarify use of barrier in frwr_wc_localinv_done() Chuck Lever
2021-04-19 18:03 ` [PATCH v3 15/26] xprtrdma: Do not recycle MR after FastReg/LocalInv flushes Chuck Lever
2021-04-25 14:19   ` Dan Aloni
2021-04-25 16:21     ` Chuck Lever III
2021-04-25 17:00       ` Dan Aloni
2021-04-19 18:03 ` [PATCH v3 16/26] xprtrdma: Do not wake RPC consumer on a failed LocalInv Chuck Lever
2021-04-19 18:03 ` [PATCH v3 17/26] xprtrdma: Avoid Send Queue wrapping Chuck Lever
2021-04-19 18:03 ` [PATCH v3 18/26] xprtrdma: Add tracepoints showing FastReg WRs and remote invalidation Chuck Lever
2021-04-19 18:03 ` [PATCH v3 19/26] xprtrdma: Add an rpcrdma_mr_completion_class Chuck Lever
2021-04-19 18:03 ` [PATCH v3 20/26] xprtrdma: Don't display r_xprt memory addresses in tracepoints Chuck Lever
2021-04-19 18:03 ` [PATCH v3 21/26] xprtrdma: Remove the RPC/RDMA QP event handler Chuck Lever
2021-04-19 18:03 ` [PATCH v3 22/26] xprtrdma: Move fr_cid to struct rpcrdma_mr Chuck Lever
2021-04-19 18:04 ` [PATCH v3 23/26] xprtrdma: Move cqe " Chuck Lever
2021-04-19 18:04 ` [PATCH v3 24/26] xprtrdma: Move fr_linv_done field " Chuck Lever
2021-04-19 18:04 ` [PATCH v3 25/26] xprtrdma: Move the Work Request union " Chuck Lever
2021-04-19 18:04 ` [PATCH v3 26/26] xprtrdma: Move fr_mr field " Chuck Lever

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