* Kees Cook <keesc...@chromium.org> wrote: > > That's the area in which we just map 1:1 to memory. Anything allocated > > with > > e.g. kmalloc() ends up with those addresses. > > Ah-ha! Yes, I see now when comparing the debug/kernel_page_tables reports. > It's > just the High Kernel Mapping that we care about. Addresses outside that range > are less of a leak. Excellent, then GDT may not be a problem. Whew.
It's still an infoleak to worry about: any function pointers nearby matter, and the x86 GDT is obviously full of useful and highly privilege-relevant function pointers ... I have no objections against read-only mapping the GDT as well. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/