linux-kernel - [PATCH v2 0/8] x86/kaslr: Cleanup and small bugfixes

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Message-Id: <20200727230801.3468620-1-nivedita@alum.mit.edu>
Date:   Mon, 27 Jul 2020 19:07:53 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/8] x86/kaslr: Cleanup and small bugfixes

The first 7 patches are cleanup and minor bugfixes on the x86 KASLR
code.

The last one is a bit of an RFC. The memory regions used for KASLR are
stored as 64-bit even on a 32-bit kernel. However there are still a few
local variables that are 32-bit, but should be ok as far as I can see
because they are assigned values that have been already limited to
32-bit. It does make it a little harder to verify that the code is
correct. Since KASLR cannot actually use 64-bit regions for the 32-bit
kernel, the patch reduces regions to their below-4G segment when
creating them, making the actual variables 32-bit. Alternatively, the
few local variables could be upgraded to 64-bit.

v1->v2:
- Fix a bug in the bugfix 5/8: overlap.start can be smaller than
  region.start, so shouldn't subtract before comparing.

Arvind Sankar (8):
  x86/kaslr: Make command line handling safer
  x86/kaslr: Remove bogus warning and unnecessary goto
  x86/kaslr: Fix process_efi_entries comment
  x86/kaslr: Initialize mem_limit to the real maximum address
  x86/kaslr: Simplify __process_mem_region
  x86/kaslr: Simplify process_gb_huge_pages
  x86/kaslr: Clean up slot handling
  x86/kaslr: Don't use 64-bit mem_vector for 32-bit kernel

 arch/x86/boot/compressed/acpi.c  |   7 +-
 arch/x86/boot/compressed/kaslr.c | 228 ++++++++++++-------------------
 arch/x86/boot/compressed/misc.h  |  19 ++-
 3 files changed, 111 insertions(+), 143 deletions(-)

-- 
2.26.2