Ravi Teja <ravi2j <at> gmail.com> writes: > Hello Ravi Teja, I've got the same problem as you. I've set mmap_min_addr as 0 and when I intentionally use MAP_FIXED to mmap to 0x00000000. I've got error "Permission Denied". I want to ask you that which .config file have you modified and what modification have you make. I really hope you can help me. Thank you. Best Regards to you. Yaner > > Hello all, > I have successfully acessed(read and write) to 0x00000000(NULL) address. I had to make certain changes in .config file and recompile it. > > Thank you all. > > Regards > Ravi Teja > > > On Sat, Sep 21, 2013 at 8:00 PM, anish singh <anish198519851985 <at> gmail.com> wrote: > > > > On Sep 21, 2013 7:35 PM, "Ravi Teja" <ravi2j <at> gmail.com> wrote: > > > > Hello Ratheesh, > > > > I have intentionally used MAP_FIXED flag as I am interested in mapping to 0x00000000. > > AFAICS in linux generally mapping to null address is not allowed as this decision helps in debugging null dereference errors. > > > > > Even after setting the mmap_min_addr in /proc/sys/vm to 0 (which was previously 4096), I am getting this error. > > > > Is there anything wrong that I am doing? > > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies <at> kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
