PCI: pciehp: Fix use-after-free on unplug

When pciehp is unbound (e.g. on unplug of a Thunderbolt device), the
hotplug_slot struct is deregistered and thus freed before freeing the
IRQ.  The IRQ handler and the work items it schedules print the slot
name referenced from the freed structure in various informational and
debug log messages, each time resulting in a quadruple dereference of
freed pointers (hotplug_slot -> pci_slot -> kobject -> name).

At best the slot name is logged as "(null)", at worst kernel memory is
exposed in logs or the driver crashes:

  pciehp 0000:10:00.0:pcie204: Slot((null)): Card not present

An attacker may provoke the bug by unplugging multiple devices on a
Thunderbolt daisy chain at once.  Unplugging can also be simulated by
powering down slots via sysfs.  The bug is particularly easy to trigger
in poll mode.

It has been present since the driver's introduction in 2004:
https://git.kernel.org/tglx/history/c/c16b4b14d980

Fix by rearranging teardown such that the IRQ is freed first.  Run the
work items queued by the IRQ handler to completion before freeing the
hotplug_slot struct by draining the work queue from the ->release_slot
callback which is invoked by pci_hp_deregister().

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org # v2.6.4

diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 5f892065585e8d00611a959cce462520d3c7c52b..fca87a1a2b2298c082efab4003239671da925e72 100644 (file)
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -119,6 +119,7 @@ int pciehp_unconfigure_device(struct slot *p_slot);
 void pciehp_queue_pushbutton_work(struct work_struct *work);
 struct controller *pcie_init(struct pcie_device *dev);
 int pcie_init_notification(struct controller *ctrl);
+void pcie_shutdown_notification(struct controller *ctrl);
 int pciehp_enable_slot(struct slot *p_slot);
 int pciehp_disable_slot(struct slot *p_slot);
 void pcie_reenable_notification(struct controller *ctrl);

diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
index 44a6a63802d5628bdc7e400f12e43f263047bd4b..2ba59fc94827a49e4c255bbeb9813175e46967b4 100644 (file)
--- a/drivers/pci/hotplug/pciehp_core.c
+++ b/drivers/pci/hotplug/pciehp_core.c
@@ -62,6 +62,12 @@ static int reset_slot(struct hotplug_slot *slot, int probe);
  */
 static void release_slot(struct hotplug_slot *hotplug_slot)
 {
+       struct slot *slot = hotplug_slot->private;
+
+       /* queued work needs hotplug_slot name */
+       cancel_delayed_work(&slot->work);
+       drain_workqueue(slot->wq);
+
        kfree(hotplug_slot->ops);
        kfree(hotplug_slot->info);
        kfree(hotplug_slot);
@@ -264,6 +270,7 @@ static void pciehp_remove(struct pcie_device *dev)
 {
        struct controller *ctrl = get_service_data(dev);
 
+       pcie_shutdown_notification(ctrl);
        cleanup_slot(ctrl);
        pciehp_release_ctrl(ctrl);
 }

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 718b6073afad1bb48385d11292a7fa6d919b582b..84b3d421c083a6e3d9881741b6e41b9dc072abdc 100644 (file)
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -765,7 +765,7 @@ int pcie_init_notification(struct controller *ctrl)
        return 0;
 }
 
-static void pcie_shutdown_notification(struct controller *ctrl)
+void pcie_shutdown_notification(struct controller *ctrl)
 {
        if (ctrl->notification_enabled) {
                pcie_disable_notification(ctrl);
@@ -800,7 +800,7 @@ abort:
 static void pcie_cleanup_slot(struct controller *ctrl)
 {
        struct slot *slot = ctrl->slot;
-       cancel_delayed_work(&slot->work);
+
        destroy_workqueue(slot->wq);
        kfree(slot);
 }
@@ -893,7 +893,6 @@ abort:
 
 void pciehp_release_ctrl(struct controller *ctrl)
 {
-       pcie_shutdown_notification(ctrl);
        pcie_cleanup_slot(ctrl);
        kfree(ctrl);
 }