linux-kernel - [PATCH v2] i3c: master: svc: Fix use after free vulnerability in svc_i3c

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Message-Id: <20240914154030.180-1-kxwang23@m.fudan.edu.cn>
Date: Sat, 14 Sep 2024 23:40:32 +0800
From: Kaixin Wang <kxwang23@...udan.edu.cn>
To: miquel.raynal@...tlin.com
Cc: 21210240012@...udan.edu.cn,
	21302010073@...udan.edu.cn,
	conor.culhane@...vaco.com,
	alexandre.belloni@...tlin.com,
	linux-i3c@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	frank.li@....com,
	stable@...r.kernel.org,
	Kaixin Wang <kxwang23@...udan.edu.cn>
Subject: [PATCH v2] i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition

In the svc_i3c_master_probe function, &master->hj_work is bound with
svc_i3c_master_hj_work, &master->ibi_work is bound with
svc_i3c_master_ibi_work. And svc_i3c_master_ibi_work  can start the
hj_work, svc_i3c_master_irq_handler can start the ibi_work.

If we remove the module which will call svc_i3c_master_remove to
make cleanup, it will free master->base through i3c_master_unregister
while the work mentioned above will be used. The sequence of operations
that may lead to a UAF bug is as follows:

CPU0                                         CPU1

                                    | svc_i3c_master_hj_work
svc_i3c_master_remove               |
i3c_master_unregister(&master->base)|
device_unregister(&master->dev)     |
device_release                      |
//free master->base                 |
                                    | i3c_master_do_daa(&master->base)
                                    | //use master->base

Fix it by ensuring that the work is canceled before proceeding with the
cleanup in svc_i3c_master_remove.

Fixes: 0f74f8b6675c ("i3c: Make i3c_master_unregister() return void")
Signed-off-by: Kaixin Wang <kxwang23@...udan.edu.cn>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

---
v2:
- add fixes tag and cc stable, suggested by Frank
- add Reviewed-by label from Miquel
- Link to v1: https://lore.kernel.org/r/20240911150135.839946-1-kxwang23@m.fudan.edu.cn
---
 drivers/i3c/master/svc-i3c-master.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 0a68fd1b81d4..e084ba648b4a 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -1775,6 +1775,7 @@ static void svc_i3c_master_remove(struct platform_device *pdev)
 {
 	struct svc_i3c_master *master = platform_get_drvdata(pdev);
 
+	cancel_work_sync(&master->hj_work);
 	i3c_master_unregister(&master->base);
 
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
-- 
2.39.1.windows.1