3.16.54-rc1 review patch. If anyone has any objections, please let me know.
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From: Shuah Khan shuahkh@osg.samsung.com
commit 2f2d0088eb93db5c649d2a5e34a3800a8a935fc5 upstream.
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: Secunia Research vuln@secunia.com Signed-off-by: Shuah Khan shuahkh@osg.samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org [bwh: Backported to 3.16: - usbip port status does not include hub type - Adjust filenames, context, indentation] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/staging/usbip/usbip_common.h | 1 + drivers/staging/usbip/vhci_sysfs.c | 25 ++++++++++++++++--------- drivers/staging/usbip/userspace/libsrc/vhci_driver.c | 8 ++++---- 3 files changed, 21 insertions(+), 13 deletions(-)
--- a/drivers/staging/usbip/usbip_common.h +++ b/drivers/staging/usbip/usbip_common.h @@ -261,6 +261,7 @@ struct usbip_device { /* lock for status */ spinlock_t lock;
+ int sockfd; struct socket *tcp_socket;
struct task_struct *tcp_rx; --- a/drivers/staging/usbip/vhci_sysfs.c +++ b/drivers/staging/usbip/vhci_sysfs.c @@ -39,13 +39,18 @@ static ssize_t status_show(struct device
/* * output example: - * prt sta spd dev socket local_busid - * 000 004 000 000 c5a7bb80 1-2.3 - * 001 004 000 000 d8cee980 2-3.4 + * prt sta spd dev sockfd local_busid + * 000 004 000 000 3 1-2.3 + * 001 004 000 000 4 2-3.4 + * + * Output includes socket fd instead of socket pointer address to avoid + * leaking kernel memory address in: + * /sys/devices/platform/vhci_hcd.0/status and in debug output. + * 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 change is made to use sockfd instead. * - * IP address can be retrieved from a socket pointer address by looking - * up /proc/net/{tcp,tcp6}. Also, a userland program may remember a - * port number and its peer IP address. */ out += sprintf(out, "prt sta spd bus dev socket local_busid\n"); @@ -59,7 +64,7 @@ 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, "%u", vdev->ud.sockfd); out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
} else { @@ -223,6 +228,7 @@ static ssize_t store_attach(struct devic
vdev->devid = devid; vdev->speed = speed; + vdev->ud.sockfd = sockfd; vdev->ud.tcp_socket = socket; vdev->ud.status = VDEV_ST_NOTASSIGNED;
--- a/drivers/staging/usbip/userspace/libsrc/vhci_driver.c +++ b/drivers/staging/usbip/userspace/libsrc/vhci_driver.c @@ -55,12 +55,12 @@ static int parse_status(const char *valu
while (*c != '\0') { int port, status, speed, devid; - unsigned long socket; + int sockfd; char lbusid[SYSFS_BUS_ID_SIZE];
- ret = sscanf(c, "%d %d %d %x %lx %31s\n", + ret = sscanf(c, "%d %d %d %x %u %31s\n", &port, &status, &speed, - &devid, &socket, lbusid); + &devid, &sockfd, lbusid);
if (ret < 5) { dbg("sscanf failed: %d", ret); @@ -69,7 +69,7 @@ static int parse_status(const char *valu
dbg("port %d status %d speed %d devid %x", port, status, speed, devid); - dbg("socket %lx lbusid %s", socket, lbusid); + dbg("sockfd %u lbusid %s", sockfd, lbusid);
/* if a device is connected, look at it */