On Tue, Nov 10, 2015 at 7:38 PM, Badhri Jagan Sridharan <[email protected]> wrote: > Mighty upstream, > > I see that do_mounts_rd.c seems to make calls to sys_read and > sys_lseek functions. As these are syscall functions, they expects > some of the arguments to be from userspace. > > I was going through the article that Greg KH wrote a while back: > http://www.linuxjournal.com/article/8110?page=0,1 . I don't see any > references to set_fs/get_fs under init/*. Does the memory protection > get enabled only in the later stage ? Or does do_mounts_rd.c accomplish > this in some other way ?
The stuff in init/ is PID 1 and it inherits addr_limit from the initial thread (PID 0 or swapper called). INIT_THREAD_INFO() sets addr_limit to KERNEL_DS. -- Thanks, //richard -- 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/
