linux-kernel - Re: [PATCH PTI v3 00/10] Clean up pgd handling and fix VSYSCALL and LDT

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Date:   Tue, 12 Dec 2017 07:58:07 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <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>
Subject: Re: [PATCH PTI v3 00/10] Clean up pgd handling and fix VSYSCALL and LDT

On Tue, Dec 12, 2017 at 2:09 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Andy Lutomirski <luto@...nel.org> wrote:
>
>> This should fix some existing 5-level bugs and get VSYSCALL and LDT
>> working with PTI.
>>
>> 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 (10):
>>   x86/espfix/64: Fix espfix double-fault handling on 5-level systems
>>   x86/pti: Vastly simplify pgd synchronization
>>   x86/pti/64: Fix ESPFIX64 user mapping
>>   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/mm/64: Improve the memory map documentation
>>   x86/mm/64: Make a full PGD-entry size hole in the memory map
>>   x86/pti: Put the LDT in its own PGD if PTI is on
>>
>>  Documentation/x86/x86_64/mm.txt         |  15 +--
>>  arch/x86/Kconfig                        |   8 --
>>  arch/x86/entry/vsyscall/vsyscall_64.c   |  37 +++++++-
>>  arch/x86/include/asm/mmu_context.h      |  48 +++++++++-
>>  arch/x86/include/asm/pgtable.h          |   6 +-
>>  arch/x86/include/asm/pgtable_64.h       |  77 +++++++---------
>>  arch/x86/include/asm/pgtable_64_types.h |   8 +-
>>  arch/x86/include/asm/processor.h        |  23 +++--
>>  arch/x86/include/asm/vsyscall.h         |   1 +
>>  arch/x86/kernel/espfix_64.c             |  16 ----
>>  arch/x86/kernel/ldt.c                   | 155 +++++++++++++++++++++++++++++--
>>  arch/x86/kernel/traps.c                 |   2 +-
>>  arch/x86/mm/dump_pagetables.c           |  12 +++
>>  arch/x86/mm/pti.c                       | 157 ++++++++++++++++++++++----------
>>  init/main.c                             |  11 ++-
>>  15 files changed, 426 insertions(+), 150 deletions(-)
>
> Hm, I only received the 0/10 boilerplate email, not any of the patches - and
> Thomas tells me he too only got the cover letter.

Ugh, the whole send-email process exploded due to Cc:
stable@...r.kernel.org # 4.14.  I stripped the # 4.14 and it's okay
now.

>
> Thanks,
>
>         Ingo