diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2012-07-04 11:22:20 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-08-10 00:24:43 +0100 |
| commit | 4e28e08b4dbd6c38c9c9e2d1f171949520c708f7 (patch) | |
| tree | c8fbfadad5f42076ebe974937f950b2773f1abc2 | |
| parent | 369e589b542f8ef0d56a95350997819d1b2222fd (diff) | |
| download | lwn-4e28e08b4dbd6c38c9c9e2d1f171949520c708f7.tar.gz lwn-4e28e08b4dbd6c38c9c9e2d1f171949520c708f7.zip | |
usb: feed USB device information to the /dev/random driver
commit b04b3156a20d395a7faa8eed98698d1e17a36000 upstream.
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | drivers/usb/core/hub.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 175b6bbdd2f6..52340cc35641 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> @@ -1897,6 +1898,14 @@ 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); /* Register the device. The device driver is responsible * for configuring the device and invoking the add-device |