Re: [PATCH 0/4] x86: Various clean-ups in support of FGKASLR

[Kees Cook <keescook@chromium.org>]

On Wed, Oct 13, 2021 at 10:57:38AM -0700, Kees Cook wrote:
> Hi,
> 
> These are a small set of patches that clean up various things that are
> each stand-alone improvements, but they're also needed for the coming
> FGKASLR series[1]. I thought it best to just get these landed instead
> of having them continue to tag along with FGKASLR, especially the
> early malloc() fix, which is a foot-gun waiting to happen. :)
> 
> Thanks!
> 
> -Kees
> 
> [1] https://lore.kernel.org/lkml/20210831144114.154-1-alexandr.lobakin@intel.com/

Peter, Josh, Boris, can someone please take these through -tip?

They're each stand-alone correctness improvements, and while FGKASLR
depends on them, there is no reason to keep them tied to that series,
especially since anyone using the early-boot malloc or making changes to
text sections is going to trip over one or several of the issues fixed
here.

They've got a bunch of reviews and acks already:
https://patchwork.kernel.org/project/linux-hardening/list/?series=562929

Thanks!

-Kees

> 
> Kees Cook (2):
>   x86/boot: Allow a "silent" kaslr random byte fetch
>   x86/boot/compressed: Avoid duplicate malloc() implementations
> 
> Kristen Carlson Accardi (2):
>   x86/tools/relocs: Support >64K section headers
>   vmlinux.lds.h: Have ORC lookup cover entire _etext - _stext
> 
>  arch/x86/boot/compressed/kaslr.c  |   4 --
>  arch/x86/boot/compressed/misc.c   |   3 +
>  arch/x86/boot/compressed/misc.h   |   2 +
>  arch/x86/lib/kaslr.c              |  18 ++++--
>  arch/x86/tools/relocs.c           | 103 ++++++++++++++++++++++--------
>  include/asm-generic/vmlinux.lds.h |   3 +-
>  include/linux/decompress/mm.h     |  12 +++-
>  7 files changed, 107 insertions(+), 38 deletions(-)
> 
> -- 
> 2.30.2
> 

-- 
Kees Cook