Page table check performs extra verifications at the time when new pages become accessible from the userspace by getting their page table entries (PTEs PMDs etc.) added into the table. It is supported on X86[1]. This patchset made some simple changes and make it easier to support new architecture, then we support this feature on ARM64 and RISCV. [1]https://lore.kernel.org/lkml/20211123214814.3756047-1-pasha.tatashin@xxxxxxxxxx/ v4 -> v5: According to Anshuman's suggestion, using PxD_SIZE instead of PxD_PAGE_SIZE in mm/page_table_check.c and it is checked by Pasha. v3 -> v4: Adapt to next-20220414 v2 -> v3: Modify ptep_clear() in include/linux/pgtable.h, using IS_ENABLED according to the suggestions of Pasha. v1 -> v2: 1. Fix arm64's pte/pmd/pud_user_accessible_page() according to the suggestions of Catalin. 2. Also fix riscv's pte_pmd_pud_user_accessible_page(). Kefeng Wang (2): mm: page_table_check: move pxx_user_accessible_page into x86 arm64: mm: add support for page table check Tong Tiangen (3): mm: page_table_check: using PxD_SIZE instead of PxD_PAGE_SIZE mm: page_table_check: add hooks to public helpers riscv: mm: add support for page table check arch/arm64/Kconfig | 1 + arch/arm64/include/asm/pgtable.h | 65 ++++++++++++++++++++++++--- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/pgtable.h | 77 +++++++++++++++++++++++++++++--- arch/x86/include/asm/pgtable.h | 29 +++++++----- include/linux/pgtable.h | 26 +++++++---- mm/page_table_check.c | 25 ++--------- 7 files changed, 174 insertions(+), 50 deletions(-) -- 2.25.1
