firewire: cdev: prevent race between first get_info ioctl and bus reset event queuing

Between open(2) of a /dev/fw* and the first FW_CDEV_IOC_GET_INFO
ioctl(2) on it, the kernel already queues FW_CDEV_EVENT_BUS_RESET events
to be read(2) by the client.  The get_info ioctl is practically always
issued right away after open, hence this condition only occurs if the
client opens during a bus reset, especially during a rapid series of bus
resets.

The problem with this condition is twofold:

  - These bus reset events carry the (as yet undocumented) @closure
    value of 0.  But it is not the kernel's place to choose closures;
    they are privat to the client.  E.g., this 0 value forced from the
    kernel makes it unsafe for clients to dereference it as a pointer to
    a closure object without NULL pointer check.

  - It is impossible for clients to determine the relative order of bus
    reset events from get_info ioctl(2) versus those from read(2),
    except in one way:  By comparison of closure values.  Again, such a
    procedure imposes complexity on clients and reduces freedom in use
    of the bus reset closure.

So, change the ABI to suppress queuing of bus reset events before the
first FW_CDEV_IOC_GET_INFO ioctl was issued by the client.

Note, this ABI change cannot be version-controlled.  The kernel cannot
distinguish old from new clients before the first FW_CDEV_IOC_GET_INFO
ioctl.

We will try to back-merge this change into currently maintained stable/
longterm series, and we only document the new behaviour.  The old
behavior is now considered a kernel bug, which it basically is.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: <stable@kernel.org>

diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 9b5915e..e6ad3bb 100644 (file)
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -253,14 +253,11 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
        init_waitqueue_head(&client->wait);
        init_waitqueue_head(&client->tx_flush_wait);
        INIT_LIST_HEAD(&client->phy_receiver_link);
+       INIT_LIST_HEAD(&client->link);
        kref_init(&client->kref);
 
        file->private_data = client;
 
-       mutex_lock(&device->client_list_mutex);
-       list_add_tail(&client->link, &device->client_list);
-       mutex_unlock(&device->client_list_mutex);
-
        return nonseekable_open(inode, file);
 }
 
@@ -451,15 +448,20 @@ static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
        if (ret != 0)
                return -EFAULT;
 
+       mutex_lock(&client->device->client_list_mutex);
+
        client->bus_reset_closure = a->bus_reset_closure;
        if (a->bus_reset != 0) {
                fill_bus_reset_event(&bus_reset, client);
-               if (copy_to_user(u64_to_uptr(a->bus_reset),
-                                &bus_reset, sizeof(bus_reset)))
-                       return -EFAULT;
+               ret = copy_to_user(u64_to_uptr(a->bus_reset),
+                                  &bus_reset, sizeof(bus_reset));
        }
+       if (ret == 0 && list_empty(&client->link))
+               list_add_tail(&client->link, &client->device->client_list);
 
-       return 0;
+       mutex_unlock(&client->device->client_list_mutex);
+
+       return ret ? -EFAULT : 0;
 }
 
 static int add_client_resource(struct client *client,

diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 4ff0988..55814aa 100644 (file)
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -475,6 +475,9 @@ union fw_cdev_event {
  *             of the bus.  This does not cause a bus reset to happen.
  * @bus_reset_closure: Value of &closure in this and subsequent bus reset events
  * @card:      The index of the card this device belongs to
+ *
+ * As a side effect, reception of %FW_CDEV_EVENT_BUS_RESET events to be read(2)
+ * is started by this ioctl.
  */
 struct fw_cdev_get_info {
        __u32 version;