[PATCH 05/12] usb: feed USB device information to the /dev/random driver

Theodore Ts'o
2012-07-06T22:45:14Z

Send the USB device's serial, product, and manufacturer strings to the
/dev/random driver to help seed its pools.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
---
drivers/usb/core/hub.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 25a7422..7f380ff 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -24,6 +24,7 @@
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/freezer.h>
+#include <linux/random.h>

#include <asm/uaccess.h>
#include <asm/byteorder.h>
@@ -2173,6 +2174,14 @@ int usb_new_device(struct usb_device *udev)
/* Tell the world! */
announce_device(udev);

+ if (udev->serial)
+ add_device_randomness(udev->serial, strlen(udev->serial));
+ if (udev->product)
+ add_device_randomness(udev->product, strlen(udev->product));
+ if (udev->manufacturer)
+ add_device_randomness(udev->manufacturer,
+ strlen(udev->manufacturer));
+
device_enable_async_suspend(&udev->dev);

/*
--
1.7.11.1.108.gb129051