Hi, > 2. how can i change the page permisson before write back instruction of > user mode application? > for example, find out the page tables of current application, find out > the pte which represents > the instruction that generate data abort, then modify pte, write back > instruction, restore pte, done. > how to do these? I think you can get the pgd of this process by current->mm->pgd and pgd_offset macro to ge the pgd entry for that address. There are macros available for accessing pmd and pte too. For example pte_offset_map for pte and a locking version for the same is also there. I don't have any hands on experience on this, so our kernel experts can comment on this more. And one more thing, if you can look at the function handle_mm_fault (mm/memory.c), there are plenty of refererces for accesing these page table entries. With Regards, Subin K G > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- With Regards Subin Gangadharan I am not afraid and I am also not afraid of being afraid. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
