NACK: [SRU Trusty] Trampoline stack + misc fixes

[Juerg Haefliger]

The trampoline stack is not urgent and we need to push it out with
xenial first.


On 03/05/2018 03:35 PM, Juerg Haefliger wrote:
> This is a pull request to add a trampoline stack to Trusty. In addition,
> the following upstream commits are included to fix three issues found
> while debugging the stack trampoline. All these issues where found
> running the x86 selftests.
> 
> - x86/signal/64: Fix SS if needed when delivering a 64-bit signal
> - x86/espfix/64: Stop assuming that pt_regs is on the entry stack
> - x86/mm: Expand the exception table logic to allow new handling options
> 
> I've run the x86 selftests plus perf (NMI testing) in parallel for
> several hours both on Intel and AMD (to force SYSCALL since AMD doesn't
> support SYSENTER) hardware and didn't notice any regression. I've also
> instrumented the entry/exit paths to verify that all modified code paths
> are being exercised.
> 
> ...Juerg
> 
> 
> The following changes since commit 46ca20f157d905e79be6f706ccdc4d855f9c268b:
> 
>   UBUNTU: Ubuntu-3.13.0-143.192 (2018-02-27 10:40:57 +0100)
> 
> are available in the git repository at:
> 
> 
> git+ssh://git.launchpad.net/~canonical-kernel-security-team/canonical-kernel-private/+git/pti
> 
> 
> for you to fetch changes up to 5af781969e447b4d8aa7893b14ad8c7f699c37b2:
> 
>   UBUNTU: SAUCE: x86/mm/kaiser: Cleanup the CR3 switching macros
> (2018-02-28 11:23:19 +0100)
> 
> ----------------------------------------------------------------
> Andy Lutomirski (3):
>       x86/kvm: Rename VMX's segment access rights defines
>       x86/signal/64: Fix SS if needed when delivering a 64-bit signal
>       x86/espfix/64: Stop assuming that pt_regs is on the entry stack
> 
> Denys Vlasenko (1):
>       include/stddef.h: Move offsetofend() from vfio.h to a generic
> kernel header
> 
> Juerg Haefliger (4):
>       Revert "UBUNTU: SAUCE: x86, extable: fix uaccess fixup detection"
>       UBUNTU: SAUCE: x86: Ensure the emergency kernel stack is 16-bytes
> aligned
>       UBUNTU: SAUCE: x86/mm: Use a trampoline stack to enter/leave the
> kernel
>       UBUNTU: SAUCE: x86/mm/kaiser: Cleanup the CR3 switching macros
> 
> Tony Luck (1):
>       x86/mm: Expand the exception table logic to allow new handling options
> 
>  Documentation/x86/exception-tables.txt |  35 ++++++
>  arch/x86/ia32/ia32entry.S              |  43 ++++++-
>  arch/x86/include/asm/asm.h             |  40 +++---
>  arch/x86/include/asm/desc_defs.h       |  23 ++++
>  arch/x86/include/asm/kaiser.h          |  48 +++++--
>  arch/x86/include/asm/processor.h       |  10 ++
>  arch/x86/include/asm/uaccess.h         |  16 +--
>  arch/x86/include/asm/vmx.h             |  46 +++----
>  arch/x86/kernel/asm-offsets_64.c       |   3 +
>  arch/x86/kernel/cpu/common.c           |   6 +
>  arch/x86/kernel/entry_64.S             | 222
> ++++++++++++++-------------------
>  arch/x86/kernel/kprobes/core.c         |   2 +-
>  arch/x86/kernel/process_64.c           |   2 +
>  arch/x86/kernel/signal.c               |  51 +++++++-
>  arch/x86/kernel/traps.c                |  44 +++++--
>  arch/x86/kvm/vmx.c                     |  12 +-
>  arch/x86/mm/extable.c                  | 112 +++++++++++------
>  arch/x86/mm/fault.c                    |   2 +-
>  include/linux/stddef.h                 |   9 ++
>  include/linux/vfio.h                   |  14 ---
>  kernel/fork.c                          |   6 -
>  scripts/sortextable.c                  |  32 +++++
>  22 files changed, 510 insertions(+), 268 deletions(-)
> 

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