Hi, here is an updated version of my PTI patches for x86-32. I worked in the review comments and fixed a few bugs that were found during review of v2. In particular, the changes to v2 are: * Switched from movsb to movsl for stack copy * Simplified sysexit path to not do a full pt_regs copy, copies now only 2 dwords to entry stack * Renamed pti_set_user_pgd() to pti_set_user_pgtbl() * Added a warning in case someone boots a 32 bit kernel on a PCIE capable machine * Added switch to user-cr3 to the paranoid exit path in case we entered the kernel from kernel-mode with user-cr3 * Simplified the debug handler now that all its special cases are handled in the stack/cr3-switch code * Fixed PGD_PAE_PHYS_MASK for XEN-PV Here is a link to my post of the v2 patches: https://marc.info/?l=linux-kernel&m=151816914932088&w=2 And I also pushed these out to: git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git pti-x32-v3 For easier testing. Please review. Thanks, Joerg Joerg Roedel (34): 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: Restore segments before int registers 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/entry/32: Add PTI cr3 switches to NMI handler code x86/entry/32: Add PTI cr3 switch to non-NMI entry/exit points 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 PCIE capable CPU arch/x86/entry/entry_32.S | 668 ++++++++++++++++++++++------ 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/switch_to.h | 6 +- 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 | 5 +- 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 | 10 +- arch/x86/mm/dump_pagetables.c | 21 +- arch/x86/mm/pgtable.c | 105 ++++- arch/x86/mm/pti.c | 42 +- security/Kconfig | 2 +- 25 files changed, 963 insertions(+), 319 deletions(-) -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
