Re: [PATCH] x86/mm/init_32: Don't print out kernel memory layout if KASLR

Arvind Sankar
2020-03-01T00:11:28Z

On Sat, Feb 29, 2020 at 03:51:45PM -0800, Kees Cook wrote:
> Arvind Sankar said:
> > For security, only show the virtual kernel memory layout if KASLR is
> > disabled.
>
> These have been entirely removed on other architectures, so let's
> just do the same for ia32 and remove it unconditionally.
>
> 071929dbdd86 ("arm64: Stop printing the virtual memory layout")
> 1c31d4e96b8c ("ARM: 8820/1: mm: Stop printing the virtual memory layout")
> 31833332f798 ("m68k/mm: Stop printing the virtual memory layout")
> fd8d0ca25631 ("parisc: Hide virtual kernel memory layout")
> adb1fe9ae2ee ("mm/page_alloc: Remove kernel address exposure in free_reserved_area()")
>
> -Kees
>
> --
> Kees Cook

microblaze (arch/microblaze/mm/init.c) and PPC32 (arch/powerpc/mm/mem.c)
appear to still print it out. I can't test those, but will resubmit
x86-32 with it removed.