Messages in this thread Patch in this message | | | Date | Tue, 07 Dec 2010 16:04:17 -0800 | From | Greg KH <> | Subject | [18/44] usb: core: fix information leak to userland |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: Vasiliy Kulikov <segooon@gmail.com>
commit 886ccd4520064408ce5876cfe00554ce52ecf4a7 upstream.
Structure usbdevfs_connectinfo is copied to userland with padding byted after "slow" field uninitialized. It leads to leaking of contents of kernel stack memory.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/usb/core/devio.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -883,10 +883,11 @@ static int proc_getdriver(struct dev_sta static int proc_connectinfo(struct dev_state *ps, void __user *arg) { - struct usbdevfs_connectinfo ci; + struct usbdevfs_connectinfo ci = { + .devnum = ps->dev->devnum, + .slow = ps->dev->speed == USB_SPEED_LOW + }; - ci.devnum = ps->dev->devnum; - ci.slow = ps->dev->speed == USB_SPEED_LOW; if (copy_to_user(arg, &ci, sizeof(ci))) return -EFAULT; return 0;
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