[Scratchbox-users] Qemu and mmap_min_addr

[Jussi Hakala]

Some of you may have noticed this already, but for those who do not yet 
know, from linux kernels 2.6.23 onward there's support for additional 
security check for mmap operations which is used for example in kernel 
that ships with latest Ubuntu, Hardy Heron.

Ubuntu ships with 65536 as a default value for mmap_min_addr, which 
prevents qemu from mmapping the low address spaces it wants, thus 
breaking the qemu based cpu transparencies inside Scratchbox as well.

The problem can fixed with [1] (worked for me when doing a quick hello 
world testing with debian lenny and 2.6.24 kernel), others [2] have used 
smaller values too...

Regards,

   Jussi

[1] sudo 'echo 32768 > /proc/sys/vm/mmap_min_addr'
[2] http://inz.fi/blog/2008/01/17/scratchbox-on-hardy/