On Sun, 13 Feb 2005 08:21:52 -0500, Arjan van de Ven <arjan@xxxxxxxxxxxxx> wrote: > you are supposed to *KNOW* that. with access_ok() you can verify if it's > a valid userspace address. That does not guarantee that it wouldn't also > be a valid kernel space address as well.... OK. I may not be understanding you completely here, because I still don't understand how when I have a syscall with the following signature: asmlinkage long foo(struct bar *bar1) I could "know" that *bar1 points to a memory location that the user can definitely access. Is it acceptable to just use access_ok() and hope for the best? Or am I upposed to allocate my own struct bar* and use copy_to_user() when I'm done? Athul -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
