linux-kernel - [PATCH PTI v2 0/6] Clean up pgd handling and fix VSYSCALL and LDT

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Message-Id: <cover.1512974667.git.luto@kernel.org>
Date:   Sun, 10 Dec 2017 22:47:16 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH PTI v2 0/6] Clean up pgd handling and fix VSYSCALL and LDT

I'm getting reasonably happy with this.  It still needs more testing,
but I want to get it out there.

The main things that need testing are the 5-level case for the both
vsyscalls and the LDT.  I'm getting a double-fault in ldt_gdt_64,
but I haven't checked whether it's a bug in this series, and it
kind of looks like it isn't.  I'll figure it out in the morning.
The docs also want updating for the 5 level case.

Changes from v1:
 - vsyscalls actually work.
 - Added the "Warn and fail" patch to prevent the testing goof I had on v1.
 - Lots of cleanups

Andy Lutomirski (6):
  x86/pti: Vastly simplify pgd synchronization
  Revert "x86/mm/pti: Disable native VSYSCALL"
  x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy
  x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode
  x86/pti: Map the vsyscall page if needed
  x86/pti: Put the LDT in its own PGD if PTI is on

 Documentation/x86/x86_64/mm.txt         |  11 ++-
 arch/x86/Kconfig                        |   8 --
 arch/x86/entry/vsyscall/vsyscall_64.c   |  37 ++++++++-
 arch/x86/include/asm/mmu_context.h      |  33 +++++++-
 arch/x86/include/asm/pgtable.h          |   6 +-
 arch/x86/include/asm/pgtable_64.h       |  77 ++++++++----------
 arch/x86/include/asm/pgtable_64_types.h |   2 +
 arch/x86/include/asm/processor.h        |  23 ++++--
 arch/x86/include/asm/vsyscall.h         |   1 +
 arch/x86/kernel/ldt.c                   | 138 +++++++++++++++++++++++++++++---
 arch/x86/mm/pti.c                       | 115 ++++++++++++++++----------
 11 files changed, 331 insertions(+), 120 deletions(-)

-- 
2.13.6