Re: [uml-devel] [PATCH] Fix stack corruption

[Blaisorblade <blaisorblade@yahoo.it>]

On Friday 14 January 2005 00:30, Christopher S. Aker wrote:
> > The fix is obvious:
> >
> > Index: 2.6.10/arch/um/kernel/skas/process.c
> > ===================================================================
> > --- 2.6.10.orig/arch/um/kernel/skas/process.c 2005-01-12
> > 11:17:22.000000000 -0500 +++ 2.6.10/arch/um/kernel/skas/process.c
> > 2005-01-12 11:18:03.000000000 -0500 @@ -323,9 +323,10 @@
> >   block_signals();
> >   if(sigsetjmp(fork_buf, 1) == 0)
> >   new_thread_proc(stack, handler);
> > - set_signals(flags);
> >
> >   remove_sigstack();
> > +
> > + set_signals(flags);
> >  }
> >
> >  void thread_wait(void *sw, void *fb)
>
> Just a follow up on this for the sake of a paper trail...  This doesn't fix
> the test-case below:
>
> http://www.theshore.net/~caker/uml/crashkit-no-console-output/
>
> readme.txt:
> ----
> All you need is an UML guest assigned an IP on your network, iptables, and
> the two files below in the same directory.  Run the script, while
> ping-flooding the UML's IP address from the host, or another machine on
> your network.
>
> This script works best with a 2.6 based UML.  I can recreate the crash
> easily using 2.6.9-linode9 (based on -bb4), also available on this website.
> ----
>
> I believe we've figured out that this is skas3 specific.  Once you start
> ping-flooding the UML, it crashes within a second.
I wasn't able to riproduce it... I ran two instances of the above loop + a 
ping flood from the host, but it didn't crash UML, even after letting it that 
way for some minutes.

-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade


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