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FAILED: patch "[PATCH] usb: setup authorized_default attributes using usb_bus_notify" failed to apply to 4.9-stable tree

PATCH [email protected] 1 participant 1 message Aug 18, 2019

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The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 27709ae4e2fe6cf7da2ae45e718e190c5433342b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thi=C3=A9baud=20Weksteen?= <[email protected]>
Date: Tue, 6 Aug 2019 13:00:50 +0200
Subject: [PATCH] usb: setup authorized_default attributes using usb_bus_notify
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Currently, the authorized_default and interface_authorized_default attributes for HCD are set up after the uevent has been sent to userland. This creates a race condition where userland may fail to access this file when processing the event. Move the appending of these attributes earlier relying on the usb_bus_notify dispatcher.

drivers/usb/core/hcd.c +0 -123
index 9320787ac2e6..2ccbc2f83570 100644
@@ -103,11 +103,6 @@ static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
 /* wait queue for synchronous unlinks */
 DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
 
-static inline int is_root_hub(struct usb_device *udev)
-{
-	return (udev->parent == NULL);
-}
-
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -880,101 +875,6 @@ static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 }
 
 
-
-/*
- * Show & store the current value of authorized_default
- */
-static ssize_t authorized_default_show(struct device *dev,
-				       struct device_attribute *attr, char *buf)
-{
-	struct usb_device *rh_usb_dev = to_usb_device(dev);
-	struct usb_bus *usb_bus = rh_usb_dev->bus;
-	struct usb_hcd *hcd;
-
-	hcd = bus_to_hcd(usb_bus);
-	return snprintf(buf, PAGE_SIZE, "%u\n", hcd->dev_policy);
-}
-
-static ssize_t authorized_default_store(struct device *dev,
-					struct device_attribute *attr,
-					const char *buf, size_t size)
-{
-	ssize_t result;
-	unsigned val;
-	struct usb_device *rh_usb_dev = to_usb_device(dev);
-	struct usb_bus *usb_bus = rh_usb_dev->bus;
-	struct usb_hcd *hcd;
-
-	hcd = bus_to_hcd(usb_bus);
-	result = sscanf(buf, "%u\n", &val);
-	if (result == 1) {
-		hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ?
-			val : USB_DEVICE_AUTHORIZE_ALL;
-		result = size;
-	} else {
-		result = -EINVAL;
-	}
-	return result;
-}
-static DEVICE_ATTR_RW(authorized_default);
-
-/*
- * interface_authorized_default_show - show default authorization status
- * for USB interfaces
- *
- * note: interface_authorized_default is the default value
- *       for initializing the authorized attribute of interfaces
- */
-static ssize_t interface_authorized_default_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct usb_device *usb_dev = to_usb_device(dev);
-	struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
-
-	return sprintf(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
-}
-
-/*
- * interface_authorized_default_store - store default authorization status
- * for USB interfaces
- *
- * note: interface_authorized_default is the default value
- *       for initializing the authorized attribute of interfaces
- */
-static ssize_t interface_authorized_default_store(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct usb_device *usb_dev = to_usb_device(dev);
-	struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
-	int rc = count;
-	bool val;
-
-	if (strtobool(buf, &val) != 0)
-		return -EINVAL;
-
-	if (val)
-		set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
-	else
-		clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
-
-	return rc;
-}
-static DEVICE_ATTR_RW(interface_authorized_default);
-
-/* Group all the USB bus attributes */
-static struct attribute *usb_bus_attrs[] = {
-		&dev_attr_authorized_default.attr,
-		&dev_attr_interface_authorized_default.attr,
-		NULL,
-};
-
-static const struct attribute_group usb_bus_attr_group = {
-	.name = NULL,	/* we want them in the same directory */
-	.attrs = usb_bus_attrs,
-};
-
-
-
 /*-------------------------------------------------------------------------*/
 
 /**
@@ -2894,32 +2794,11 @@ int usb_add_hcd(struct usb_hcd *hcd,
 	if (retval != 0)
 		goto err_register_root_hub;
 
-	retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
-	if (retval < 0) {
-		printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
-		       retval);
-		goto error_create_attr_group;
-	}
 	if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
 		usb_hcd_poll_rh_status(hcd);
 
 	return retval;
 
-error_create_attr_group:
-	clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
-	if (HC_IS_RUNNING(hcd->state))
-		hcd->state = HC_STATE_QUIESCING;
-	spin_lock_irq(&hcd_root_hub_lock);
-	hcd->rh_registered = 0;
-	spin_unlock_irq(&hcd_root_hub_lock);
-
-#ifdef CONFIG_PM
-	cancel_work_sync(&hcd->wakeup_work);
-#endif
-	cancel_work_sync(&hcd->died_work);
-	mutex_lock(&usb_bus_idr_lock);
-	usb_disconnect(&rhdev);		/* Sets rhdev to NULL */
-	mutex_unlock(&usb_bus_idr_lock);
 err_register_root_hub:
 	hcd->rh_pollable = 0;
 	clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
@@ -2963,8 +2842,6 @@ void usb_remove_hcd(struct usb_hcd *hcd)
 	dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
 
 	usb_get_dev(rhdev);
-	sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
-
 	clear_bit(HCD_FLAG_RH_RUNNING, &hcd->flags);
 	if (HC_IS_RUNNING (hcd->state))
 		hcd->state = HC_STATE_QUIESCING;
drivers/usb/core/sysfs.c +121 -0

146 lines not on this page · raw message

drivers/usb/core/usb.h +5 -0
index bd8d01f85a13..0c9fde5ad052 100644
@@ -153,6 +153,11 @@ static inline int is_usb_port(const struct device *dev)
 	return dev->type == &usb_port_device_type;
 }
 
+static inline int is_root_hub(struct usb_device *udev)
+{
+	return (udev->parent == NULL);
+}
+
 /* Do the same for device drivers and interface drivers. */
 
 static inline int is_usb_device_driver(struct device_driver *drv)