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usb: feed USB device information to the /dev/random driver

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commit b04b3156a2 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ed Tam <etam@google.com>
This commit is contained in:
Theodore Ts'o 2012-07-04 11:22:20 -04:00 committed by Ed Tam
parent 65711ffd02
commit b7436bfe4a
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/core/hub.c
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@ -25,6 +25,7 @@
#include <linux/kthread.h> #include <linux/kthread.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/freezer.h> #include <linux/freezer.h>
#include <linux/random.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/byteorder.h> #include <asm/byteorder.h>
@ -2038,6 +2039,14 @@ int usb_new_device(struct usb_device *udev)
/* Tell the world! */ /* Tell the world! */
announce_device(udev); 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); device_enable_async_suspend(&udev->dev);
/* /*