On Fri, 10 Aug 2007 15:48:28 +0400 [EMAIL PROTECTED] wrote: > This is the largest patch in the set. Make all (I hope) the places where > the pid is shown to or get from user operate on the virtual pids. > > The idea is: > - all in-kernel data structures must store either struct pid itself > or the pid's global nr, obtained with pid_nr() call; > - when seeking the task from kernel code with the stored id one > should use find_task_by_pid() call that works with global pids; > - when showing pid's numerical value to the user the virtual one > should be used, but however when one shows task's pid outside this > task's namespace the global one is to be used; > - when getting the pid from userspace one need to consider this as > the virtual one and use appropriate task/pid-searching functions. > > ... > > - si.si_pid = current->pid; > + si.si_pid = task_pid_vnr(current);
This is going to be an ongoing maintenance problem: people will sneak new references to current->pid into the tree and nobody will notice. It'd be best to rename task_struct.pid to something else to catch such problems and to force people to use the right accessors. Is that feasible? Generally this is a tactic which should be used whenever things like this are virtualised. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
