On 05/08/14 at 12:31pm, Kees Cook wrote: > On Thu, May 8, 2014 at 2:46 AM, Dave Young <[email protected]> wrote: > > On 04/24/14 at 03:50pm, Kees Cook wrote: > >> On Wed, Apr 23, 2014 at 7:50 PM, Dave Young <[email protected]> wrote: > >> > On 04/23/14 at 07:43pm, Kees Cook wrote: > >> >> On Wed, Apr 23, 2014 at 7:35 PM, Dave Young <[email protected]> wrote: > >> >> > Hello Kees > >> >> > > >> >> > I'm worrying that setup_data regions could be overwitten by randomize > >> >> > kernel base. Would you like to fix it in kaslr code? > >> >> > > >> >> > One problem is there could be a lot of setup_data regions but current > >> >> > mem_avoid is an fixed array. > >> >> > >> >> Sure, can you give me some examples? Seems like it shouldn't be too > >> >> hard to have the mem_avoid logic walk additional areas. > >> > > >> > Great, To walk through the list just like the function parse_setup_data > >> > in > >> > arch/x86/kernel/setup.c > > > > One problem for me is that I am not sure how to read the setup_data memory > > and iterate it, I think early_ioremap is not available that early. BTW the > > setup_data region could be above 4G. > > > > Appreciate for any hints. > > Hm, I'm not sure. The kASLR code only deals with memory that has been > set up during the physical/virtual identity mapping. >
So will dereference them directly and ignore setup_data which is above 4G. Thanks Dave -- 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/
