Keith Owens <[EMAIL PROTECTED]> writes:
|> On Fri, 04 May 2001 07:34:20 -0500,
|> Todd Inglett <[EMAIL PROTECTED]> wrote:
|> >But this is where hell breaks loose. Every process has a valid parent
|> >-- unless it is dead and nobody cares. Process N has already exited and
|> >released from the tasklist while its parent was still alive. There was
|> >no reason to reparent it. It just got released. So N's task_struct has
|> >a dangling ptr to its parent. Nobody is holding the parent task_struct,
|> >either. When the parent died memory for its task_struct was released.
|> >This is ungood.
|>
|> Wrap the reference to the parent task structure with exception table
|> recovery code, like copy_from_user().
Exception tables only protect accesses to user virtual memory. Kernel
memory references must always be valid in the first place.
Andreas.
--
Andreas Schwab "And now for something
SuSE Labs completely different."
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