On Wed, Jun 01, 2005 at 12:12:58AM +0200, Harald Welte wrote: > > > Wouldn't it help to associate the URB with the file (instaed of the > > > task), and then send the signal to any task that still has opened the > > > file? I'm willing to hack up a patch, if this is considered a sane fix. > > > > Sounds reasonable, except that not all such tasks will want the signal. > > Though I guess the infrastructure to filter the signal out already exists, > > so the main missing piece is that urb-to-file binding. > > Ok, I'll get something coded shortly. Unfortunately this approach is not feasible, since there is no 'reverse mapping' from a file to a process. So for every URB delivery, we would have to walk that task_list and check which tasks have opened this file. So what do we do now? A reimplementation of async URB handling (probably use the AIO code) from userspace is a significant amount of work. Meanwhile, this bug allows any regular non-root userspace program with access to a single USB device to oops the kernel, so a short-term fix is definitely required for security reasons. -- - Harald Welte <[email protected]> http://gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
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