Hi... On Thu, Oct 6, 2011 at 02:34, Vaibhav Jain <vjoss197@xxxxxxxxx> wrote: > Hi, > > I am trying to run a program that scans memory from a given physical address > using /dev/mem. > It uses mmap to map physical address from /dev/mem. So to start with I used > /proc/iomem to look up the > physical memory mapping and found the address 00010000 to be the starting > address for System ram. But whenever I > provide this address to the program it throws an error of "Operation not > permitted". Probably this could also due to mmap NULL dereferencing protection (at least that's how I name it :) ) By default, the lowest 65536 byte (10000 in hex) is protected from mapping etc. It practically render such null dererefencing useless. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
