BugLink: http://bugs.launchpad.net/bugs/1730775
This new security level works so that it creates one PCIe tunnel to the
connected Thunderbolt dock, removing PCIe links downstream of the dock.
This leaves only the internal USB controller visible.
Display Port tunnels are created normally.
While there make sure security sysfs attribute returns "unknown" for any
future security level.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
(cherry picked from commit
6fc14e1a44e53c472865252b47398346a27d600e linux-next)
Signed-off-by: Anthony Wong <anthony.wong@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
minimum. User needs to authorize each device.
dponly: Automatically tunnel Display port (and USB). No
PCIe tunnels are created.
+ usbonly: Automatically tunnel USB controller of the
+ connected Thunderbolt dock (and Display Port). All
+ PCIe links downstream of the dock are removed.
What: /sys/bus/thunderbolt/devices/.../authorized
Date: Sep 2017
Security levels and how to use them
-----------------------------------
Starting with Intel Falcon Ridge Thunderbolt controller there are 4
-security levels available. The reason for these is the fact that the
-connected devices can be DMA masters and thus read contents of the host
-memory without CPU and OS knowing about it. There are ways to prevent
-this by setting up an IOMMU but it is not always available for various
-reasons.
+security levels available. Intel Titan Ridge added one more security level
+(usbonly). The reason for these is the fact that the connected devices can
+be DMA masters and thus read contents of the host memory without CPU and OS
+knowing about it. There are ways to prevent this by setting up an IOMMU but
+it is not always available for various reasons.
The security levels are as follows:
USB. No PCIe tunneling is done. In BIOS settings this is
typically called *Display Port Only*.
+ usbonly
+ The firmware automatically creates tunnels for the USB controller and
+ Display Port in a dock. All PCIe links downstream of the dock are
+ removed.
+
The current security level can be read from
``/sys/bus/thunderbolt/devices/domainX/security`` where ``domainX`` is
the Thunderbolt domain the host controller manages. There is typically
[TB_SECURITY_USER] = "user",
[TB_SECURITY_SECURE] = "secure",
[TB_SECURITY_DPONLY] = "dponly",
+ [TB_SECURITY_USBONLY] = "usbonly",
};
static ssize_t boot_acl_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tb *tb = container_of(dev, struct tb, dev);
+ const char *name = "unknown";
- return sprintf(buf, "%s\n", tb_security_names[tb->security_level]);
+ if (tb->security_level < ARRAY_SIZE(tb_security_names))
+ name = tb_security_names[tb->security_level];
+
+ return sprintf(buf, "%s\n", name);
}
static DEVICE_ATTR_RO(security);
* @TB_SECURITY_USER: User approval required at minimum
* @TB_SECURITY_SECURE: One time saved key required at minimum
* @TB_SECURITY_DPONLY: Only tunnel Display port (and USB)
+ * @TB_SECURITY_USBONLY: Only tunnel USB controller of the connected
+ * Thunderbolt dock (and Display Port). All PCIe
+ * links downstream of the dock are removed.
*/
enum tb_security_level {
TB_SECURITY_NONE,
TB_SECURITY_USER,
TB_SECURITY_SECURE,
TB_SECURITY_DPONLY,
+ TB_SECURITY_USBONLY,
};
/**