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: <20250806083955.3325299-1-xu.yang_2@nxp.com>
Date: Wed,  6 Aug 2025 16:39:55 +0800
From: Xu Yang <xu.yang_2@....com>
To: gregkh@...uxfoundation.org,
	mingo@...nel.org,
	tglx@...utronix.de,
	jun.li@....com,
	viro@...iv.linux.org.uk,
	thomas.weissschuh@...utronix.de,
	andriy.shevchenko@...ux.intel.com,
	stern@...land.harvard.edu
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev
Subject: [PATCH] usb: core: hcd: fix accessing unmapped memory in SINGLE_STEP_SET_FEATURE test

The USB core will unmap urb->transfer_dma after SETUP stage completes.
Then the USB controller will access unmapped memory when it received
device descriptor. If iommu is equipped, the entire test can't be
completed due to the memory accessing is blocked.

Fix it by calling map_urb_for_dma() again for IN stage. To reduce
redundant map for urb->transfer_buffer, this will also set
URB_NO_TRANSFER_DMA_MAP flag before first map_urb_for_dma() to skip
dma map for urb->transfer_buffer and clear URB_NO_TRANSFER_DMA_MAP
flag before second map_urb_for_dma().

Fixes: 216e0e563d81 ("usb: core: hcd: use map_urb_for_dma for single step set feature urb")
Cc: stable@...r.kernel.org
Reviewed-by: Jun Li <jun.li@....com>
Signed-off-by: Xu Yang <xu.yang_2@....com>
---
 drivers/usb/core/hcd.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 03771bbc6c01..c4a1875b5d3d 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2166,7 +2166,7 @@ static struct urb *request_single_step_set_feature_urb(
 	urb->complete = usb_ehset_completion;
 	urb->status = -EINPROGRESS;
 	urb->actual_length = 0;
-	urb->transfer_flags = URB_DIR_IN;
+	urb->transfer_flags = URB_DIR_IN | URB_NO_TRANSFER_DMA_MAP;
 	usb_get_urb(urb);
 	atomic_inc(&urb->use_count);
 	atomic_inc(&urb->dev->urbnum);
@@ -2230,9 +2230,15 @@ int ehset_single_step_set_feature(struct usb_hcd *hcd, int port)
 
 	/* Complete remaining DATA and STATUS stages using the same URB */
 	urb->status = -EINPROGRESS;
+	urb->transfer_flags &= ~URB_NO_TRANSFER_DMA_MAP;
 	usb_get_urb(urb);
 	atomic_inc(&urb->use_count);
 	atomic_inc(&urb->dev->urbnum);
+	if (map_urb_for_dma(hcd, urb, GFP_KERNEL)) {
+		usb_put_urb(urb);
+		goto out1;
+	}
+
 	retval = hcd->driver->submit_single_step_set_feature(hcd, urb, 0);
 	if (!retval && !wait_for_completion_timeout(&done,
 						msecs_to_jiffies(2000))) {
-- 
2.34.1


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ