On Sunday 08 October 2006 02:22, Jeremy Fitzhardinge wrote:
> Though (*something_ops->thingy)() becomes a lot more interesting if
> something_ops or ->thingy is NULL...
It's always very critical if a userspace program can modify some
data in the kernel. Be it function pointers or plain data.
Also consider something like:
if (task->uid == 0)
allow_access_to_time_machine();
else
return -EPERM;
Now if "task" may be a NULL pointer (due to a bug) it
can be exploited.
PS: Please don't drop me from the CC list ;)
--
Greetings Michael.
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