Re: bug in libffi with selinux and a fork

[Andrew Haley <aph at redhat dot com>]

Victor Stinner wrote:
> Le mardi 27 octobre 2009 13:42:45, Andrew Haley a écrit :
> > > (...)
> > > mmap2(NULL, 4096, PROT_READ|PROT_EXEC, MAP_SHARED, 3, 0) = 0xc41000
> > > mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0xb7c7d000
> > Hmmm, interesting.  This is going to be quite hard to fix.
>
> Whould it be possible to just replace MAP_SHARED by MAP_PRIVATE? If not, you 
> may add a reference counter (which may require a mutex).
>
> > Why is the child process destroying the closure, anyway?
>
> Why not? :-)

I might as well say "Don't do that, then."  But I won't :-)

Would you like to try replacing MAP_SHARED with MAP_PRIVATE
and getting back to us?

Thanks,
Andrew.