On Iau, 2003-05-08 at 22:31, Alan Cox wrote:
> > Using is_dumpable() here is not neccesary because the checks done here are:
> >
> > > if (!(child->ptrace & PT_PTRACED))
> > > return -ESRCH;
>
> Except that current->mm->dumpable is not per task but per mm so you
> might ptrace one thread and have another go setuid.
Thinking about this harder
A ptraced thread cannot go setuid since we don't permit the exec to do
it
A setuid thread marks the mm dumpable so no thread can be ptraced (since
all threads inheriting the mm inherit it from the exec)
So ignore my earlier message
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This archive was generated by hypermail 2b29 : Thu May 15 2003 - 22:00:29 EST