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[PATCH 00/39 v7] PTI support for x86-32




Hi,

here is version 7 of my patches to enable PTI on x86-32.
Changes to the previous version are:

	* Rebased to v4.18-rc4

	* Introduced pti_finalize() which is called after
	  mark_readonly() and used to update the kernel
	  mappings in the user page-table after RO/NX
	  protections are in place.

The patches need the vmalloc/ioremap fixes in tip/x86/mm to
work correctly, because this enablement makes the issues
fixed there more likely to happen.

I did the load-testing again with 'perf top', the ldt_gdt
self-test and a kernel-compile running in a loop again. The
patches posted here were tested for 16 hours without any
regression showing up. An earlier version of these patches
based on v4.18-rc1 survived this test for over a week before
I canceled the test. The test ran with enabled CR3 debugging
added in the last patch of this series.

A git-branch with these patches and the fixes from
tip/x86/mm merged can be found at:

	git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v7

The previous version of these patches can be found at:

	* For v6:
	  Post : https://lore.kernel.org/lkml/1524498460-25530-1-git-send-email-joro@xxxxxxxxxx/
	  Git  : git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v6

	* For v5:
	  Post : https://marc.info/?l=linux-kernel&m=152389297705480&w=2
	  Git  : git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v5

	* For v4:
	  Post : https://marc.info/?l=linux-kernel&m=152122860630236&w=2
	  Git  : git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v4

	* For v3:
	  Post : https://marc.info/?l=linux-kernel&m=152024559419876&w=2
	  Git  : git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v3

	* For v2:
	  Post : https://marc.info/?l=linux-kernel&m=151816914932088&w=2
	  Git  : git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v2

Please review.

Thanks,

	Joerg

Joerg Roedel (39):
  x86/asm-offsets: Move TSS_sp0 and TSS_sp1 to asm-offsets.c
  x86/entry/32: Rename TSS_sysenter_sp0 to TSS_entry_stack
  x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler
  x86/entry/32: Put ESPFIX code into a macro
  x86/entry/32: Unshare NMI return path
  x86/entry/32: Split off return-to-kernel path
  x86/entry/32: Enter the kernel via trampoline stack
  x86/entry/32: Leave the kernel via trampoline stack
  x86/entry/32: Introduce SAVE_ALL_NMI and RESTORE_ALL_NMI
  x86/entry/32: Handle Entry from Kernel-Mode on Entry-Stack
  x86/entry/32: Simplify debug entry point
  x86/32: Use tss.sp1 as cpu_current_top_of_stack
  x86/entry/32: Add PTI cr3 switch to non-NMI entry/exit points
  x86/entry/32: Add PTI cr3 switches to NMI handler code
  x86/pgtable: Rename pti_set_user_pgd to pti_set_user_pgtbl
  x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled
  x86/pgtable/32: Allocate 8k page-tables when PTI is enabled
  x86/pgtable: Move pgdp kernel/user conversion functions to pgtable.h
  x86/pgtable: Move pti_set_user_pgtbl() to pgtable.h
  x86/pgtable: Move two more functions from pgtable_64.h to pgtable.h
  x86/mm/pae: Populate valid user PGD entries
  x86/mm/pae: Populate the user page-table with user pgd's
  x86/mm/legacy: Populate the user page-table with user pgd's
  x86/mm/pti: Add an overflow check to pti_clone_pmds()
  x86/mm/pti: Define X86_CR3_PTI_PCID_USER_BIT on x86_32
  x86/mm/pti: Clone CPU_ENTRY_AREA on PMD level on x86_32
  x86/mm/pti: Make pti_clone_kernel_text() compile on 32 bit
  x86/mm/pti: Keep permissions when cloning kernel text in
    pti_clone_kernel_text()
  x86/mm/pti: Introduce pti_finalize()
  x86/mm/pti: Clone entry-text again in pti_finalize()
  x86/mm/dump_pagetables: Define INIT_PGD
  x86/pgtable/pae: Use separate kernel PMDs for user page-table
  x86/ldt: Reserve address-space range on 32 bit for the LDT
  x86/ldt: Define LDT_END_ADDR
  x86/ldt: Split out sanity check in map_ldt_struct()
  x86/ldt: Enable LDT user-mapping for PAE
  x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32
  x86/mm/pti: Add Warning when booting on a PCID capable CPU
  x86/entry/32: Add debug code to check entry/exit cr3

 arch/x86/Kconfig.debug                      |  12 +
 arch/x86/entry/entry_32.S                   | 640 +++++++++++++++++++++++-----
 arch/x86/include/asm/mmu_context.h          |   5 -
 arch/x86/include/asm/pgtable-2level.h       |   9 +
 arch/x86/include/asm/pgtable-2level_types.h |   3 +
 arch/x86/include/asm/pgtable-3level.h       |   7 +
 arch/x86/include/asm/pgtable-3level_types.h |   6 +-
 arch/x86/include/asm/pgtable.h              |  87 ++++
 arch/x86/include/asm/pgtable_32.h           |   2 -
 arch/x86/include/asm/pgtable_32_types.h     |   9 +-
 arch/x86/include/asm/pgtable_64.h           |  89 +---
 arch/x86/include/asm/pgtable_64_types.h     |   3 +
 arch/x86/include/asm/pgtable_types.h        |  28 +-
 arch/x86/include/asm/processor-flags.h      |   8 +-
 arch/x86/include/asm/processor.h            |   4 -
 arch/x86/include/asm/pti.h                  |   3 +-
 arch/x86/include/asm/sections.h             |   1 +
 arch/x86/include/asm/switch_to.h            |   6 +-
 arch/x86/include/asm/thread_info.h          |   2 -
 arch/x86/kernel/asm-offsets.c               |   5 +
 arch/x86/kernel/asm-offsets_32.c            |   2 +-
 arch/x86/kernel/asm-offsets_64.c            |   2 -
 arch/x86/kernel/cpu/common.c                |   9 +-
 arch/x86/kernel/head_32.S                   |  20 +-
 arch/x86/kernel/ldt.c                       | 137 ++++--
 arch/x86/kernel/process.c                   |   2 -
 arch/x86/kernel/process_32.c                |   4 +-
 arch/x86/kernel/vmlinux.lds.S               |  17 +-
 arch/x86/mm/dump_pagetables.c               |  21 +-
 arch/x86/mm/init_64.c                       |   6 -
 arch/x86/mm/pgtable.c                       | 105 ++++-
 arch/x86/mm/pti.c                           |  67 ++-
 include/linux/pti.h                         |   1 +
 init/main.c                                 |   7 +
 security/Kconfig                            |   2 +-
 35 files changed, 1008 insertions(+), 323 deletions(-)

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2.7.4