Re: [PATCH] parisc: fix kernel crash when unwinding a userspace process

[Randolph Chung <randolph@tausq.org>]

Helge Deller wrote:
> Any user on existing parisc 32- and 64bit-kernels can easily crash
> the kernel and as such enforce a DSO.
> A simple testcase is available here: 
> 	http://gsyprf10.external.hp.com/~deller/crash.tgz
> 
> The problem is introduced by the fact, that the handle_interruption()
> crash handler calls the show_regs() function, which in turn tries
> to unwind the stack by calling parisc_show_stack().
> Since the stack contains userspace addresses, a try to unwind 
> the stack is dangerous and useless and leads to the crash.

Helge,

I think this is ok, but can you preserve the printing of IAOQ/RP even 
for user processes?

randolph