On Tue, Apr 20, 2010 at 06:08:14PM +0530, Uma shankar wrote: > Hi, > > Is it possible for the kernel to access the user-stack data of a > task different from "current" ? ( This is needed for stack-dump as > well as backtrace. ) Yes, have a look at __get_user_pages() in mm/memory.c. > I thought the answer is "no". ( Kernel sees memory through the > page-table of "current" ) That is correct when using virtual addresses and letting the MMU do the page table lookup in the currently active page tables. But if you have the task_struct of another process, you can easily get to its vmas and page tables (task->mm) and walk them in software. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>