linux-kernel - [PATCH] remoteproc: imx_rproc: Add mutex protection for workqueue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250331112246.2407276-1-peng.fan@oss.nxp.com>
Date: Mon, 31 Mar 2025 19:22:45 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	linux-remoteproc@...r.kernel.org (open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM),
	imx@...ts.linux.dev (open list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE),
	linux-kernel@...r.kernel.org (open list)
Cc: Peng Fan <peng.fan@....com>
Subject: [PATCH] remoteproc: imx_rproc: Add mutex protection for workqueue

From: Peng Fan <peng.fan@....com>

Same as
commit 47e6ab07018e ("remoteproc: imx_dsp_rproc: Add mutex
protection for workqueue") and commit 35bdafda40cc ("remoteproc:
stm32_rproc: Add mutex protection for workqueue"), imx_rproc driver
also has similar issue, although no issue reported until now.

Reuse the commit log from the fix to imx_dsp_rproc:

The workqueue may execute late even after remoteproc is stopped or
stopping, some resources (rpmsg device and endpoint) have been
released in rproc_stop_subdevices(), then rproc_vq_interrupt()
accessing these resources will cause kennel dump.

Call trace:
 virtqueue_add_split
 virtqueue_add_inbuf
 rpmsg_recv_done
 vring_interrupt
 rproc_vq_interrupt
 imx_rproc_vq_work
 process_one_work
 worker_thread
 kthread
 ret_from_fork

Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/remoteproc/imx_rproc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 74299af1d7f1..f933c8f4fc8b 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -5,6 +5,7 @@
 
 #include <dt-bindings/firmware/imx/rsrc.h>
 #include <linux/arm-smccc.h>
+#include <linux/cleanup.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/firmware/imx/sci.h>
@@ -785,6 +786,11 @@ static void imx_rproc_vq_work(struct work_struct *work)
 					      rproc_work);
 	struct rproc *rproc = priv->rproc;
 
+	guard(mutex)(&rproc->lock);
+
+	if (rproc->state != RPROC_RUNNING)
+		return;
+
 	idr_for_each(&rproc->notifyids, imx_rproc_notified_idr_cb, rproc);
 }
 
-- 
2.37.1