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Date: Fri, 16 Mar 2018 20:29:18 +0100
From: Joerg Roedel <joro@...tes.org>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
"H . Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...el.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Juergen Gross <jgross@...e.com>,
Peter Zijlstra <peterz@...radead.org>,
Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Brian Gerst <brgerst@...il.com>,
David Laight <David.Laight@...lab.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
Eduardo Valentin <eduval@...zon.com>,
Greg KH <gregkh@...uxfoundation.org>,
Will Deacon <will.deacon@....com>, aliguori@...zon.com,
daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
Andrea Arcangeli <aarcange@...hat.com>,
Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
jroedel@...e.de, joro@...tes.org
Subject: [PATCH 00/35 v4] PTI support for x32
Hi,
here is an updated version of my PTI enablement patches for
the x86-32 architecture. I worked in the review comments for
v3 and updated the patches here and there. The patch that
re-organized RESTORE_REGS to load segments first is dropped
now.
A notable addition in this version is the last
patch which adds debug-checks to the kernel entry/exit
points that will cause a BUG if they find a wrong CR3. The
checks can be enabled with a config-option and are for
debugging only. I used them for testing this series, the
checks did not trigger during my tests. I included the patch
because I am not sure whether it is wanted upstream, if not,
just tell me and I'll drop it.
While at testing: I tested the patches again on a real
machine (4C/8T, 16GB RAM) and ran 'perf top' for the NMI
load, the x86 self-tests in a loop, and a -j16 kernel
compile loop in parallel for a couple of hours. This didn't
trigger any problems. I also boot-tested various
combinations of PAE/non-PAE and HIGHMEM/no-HIGHMEM, also
without any issues.
In particular, the changes to v3 are:
* Dropped the RESTORE_REGS splitting
* Changed the cpu_current_top_of_stack to just point
to tss.sp1, like it does on x86-64.
* Simplified SAVE_ALL_NMI to just use
SWITCH_TO_KERNEL_CR3 now that this macro returns
the old cr3
* Added a debug Kconfig option which adds checks to
the kernel entry/exit paths if the cpu is on the
expected cr3 and which will BUG if not.
* Explicitly clear the high word of the CS slot in
pt_regs for hardware that doesn't do it for us.
There is also a again branch with these patches on git.kernel.org:
git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v4
The previous version of this patch-set can be found at:
* 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 (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 | 4 -
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 | 88 ++++
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 | 4 +
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 +-
28 files changed, 969 insertions(+), 301 deletions(-)
--
2.7.4
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