[PATCH 00/35 v5] PTI support for x32

From: Joerg Roedel
Date: Mon Apr 16 2018 - 11:36:11 EST


here is the 5th iteration of my PTI enablement patches for
x86-32. There are no real changes between v4 and v5 besides
that I rebased the whole patch-set to v4.17-rc1 and resolved
the numerous conflicts that this caused.

Two separate fixes came up since the last post and I sent them
out separatly. One is already in v4.17-rc1 (commit e3e288121408)
and the other was sent a few hours ago

I pushed the rebased patches together with the mentioned fix

git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v5

for easier testing.

I tested this version again with my load-test of running
perf-top/various x86-selftests/kernel-compile in a loop for
a couple of hours. This showed no issues. I also briefly
tested a 64bit kernel and this also worked as expected.

Previous versions of these patches can be found at:

* 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.



Joerg Roedel (35):
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/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/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/mm/dump_pagetables.c | 21 +-
arch/x86/mm/pgtable.c | 105 ++++-
arch/x86/mm/pti.c | 42 +-
security/Kconfig | 2 +-
29 files changed, 967 insertions(+), 304 deletions(-)