On Thursday 10 November 2005 11:30, Thomas Petazzoni wrote: > What do you call "memory descriptor" ? The mm_struct > (http://lxr.linux.no/source/include/linux/sched.h#L207) or the > vm_area_struct (http://lxr.linux.no/source/include/linux/mm.h#L61) ? > For "memory descriptor" I mean mm_struct but I scan it by means of vm_area_structs. > When you say "set this descriptor as not writable", you mean changing > vm_area_struct->vm_page_prot ? No. For each vma of the mm_struct shared by the threads, I scan all pages and make them not writable by means of the instruction: set_pte(pte, pte_wrprotect(*pte)); where *pte is the related Page Table Entry. > The local variables are stored on the stack. Simply don't mark the vma > covering the stack as read-only, or skip your code when a page fault > occurs in the stack. Now, if a program contains instructions to explicitly assign a variable as TLS, this variable is stored out of the stack? Thanks. Vincenzo Mallozzi. ___________________________________ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
