4.4-stable review patch. If anyone has any objections, please let me know.
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From: Shuah Khan shuahkh@osg.samsung.com
Commit 3eee23c3ec14 ("usbip: prevent vhci_hcd driver from leaking a socket pointer address") backported the following commit from mailine. However, backport error caused the tcp_socket address to still leak.
commit 2f2d0088eb93 ("usbip: prevent vhci_hcd driver from leaking a socket pointer address")
When a client has a USB device attached over IP, the vhci_hcd driver is locally leaking a socket pointer address via the
/sys/devices/platform/vhci_hcd/status file (world-readable) and in debug output when "usbip --debug port" is run.
Fix it to not leak. The socket pointer address is not used at the moment and it was made visible as a convenient way to find IP address from socket pointer address by looking up /proc/net/{tcp,tcp6}.
As this opens a security hole, the fix replaces socket pointer address with sockfd.
Reported-by: Eric Biggers ebiggers3@gmail.com Signed-off-by: Shuah Khan shuahkh@osg.samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/usbip/vhci_sysfs.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
--- a/drivers/usb/usbip/vhci_sysfs.c +++ b/drivers/usb/usbip/vhci_sysfs.c @@ -53,7 +53,7 @@ static ssize_t status_show(struct device * a security hole, the change is made to use sockfd instead. */ out += sprintf(out, - "prt sta spd bus dev sockfd local_busid\n"); + "prt sta spd dev sockfd local_busid\n");
for (i = 0; i < VHCI_NPORTS; i++) { struct vhci_device *vdev = port_to_vdev(i); @@ -64,12 +64,11 @@ static ssize_t status_show(struct device if (vdev->ud.status == VDEV_ST_USED) { out += sprintf(out, "%03u %08x ", vdev->speed, vdev->devid); - out += sprintf(out, "%16p ", vdev->ud.tcp_socket); - out += sprintf(out, "%06u", vdev->ud.sockfd); + out += sprintf(out, "%06u ", vdev->ud.sockfd); out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
} else - out += sprintf(out, "000 000 000 000000 0-0"); + out += sprintf(out, "000 00000000 000000 0-0");
out += sprintf(out, "\n"); spin_unlock(&vdev->ud.lock);