| From | Greg Kroah-Hartman <> | Subject | [ 33/65] usb: feed USB device information to the /dev/random driver | Date | Mon, 13 Aug 2012 15:14:17 -0700 |
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From: Greg KH <gregkh@linuxfoundation.org>
3.4-stable review patch. If anyone has any objections, please let me know.
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From: Theodore Ts'o <tytso@mit.edu>
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/core/hub.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- 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> @@ -1951,6 +1952,14 @@ int usb_new_device(struct usb_device *ud /* 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); /*
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