Hi All,
This is v2 of a series to improve the encapsulation of pte entries by
disallowing non-arch code from directly dereferencing pte_t pointers. Instead
code must use a new helper, `pte_t ptep_deref(pte_t *ptep)`.
See the v1 cover letter at [1] for rationale and explanation of approach.
As with v1, the series is split up as follows:
patchs 1-2: Fix bugs where code was _setting_ ptes directly, rather than using
set_pte_at() and friends.
patch 3: Fix highmem unmapping issue I spotted while doing the work.
patch 4: Introduce the new ptep_deref() helper with default implementation.
patch 5: Convert all direct dereferences to use ptep_deref().
Patches are based on v6.4-rc2 and a branch is available at [2].
Changes since v1:
- patch 5: Fixed sh build bug reported by 0-day CI
- patch 1: Refactored pfn to use local variable
- patch 1-2: Minor rewording of commit message: 'verify' -> 'check'
- patch 1-3: applied Ack/Reviewed-by tags; thanks for those!
[1] https://lore.kernel.org/linux-mm/20230511132113.80196-1-ryan.roberts@xxxxxxx/
[2] https://gitlab.arm.com/linux-arm/linux-rr/-/tree/features/granule_perf/ptep_deref-lkml_v2
Thanks,
Ryan
Ryan Roberts (5):
mm: vmalloc must set pte via arch code
mm: damon must atomically clear young on ptes and pmds
mm: Fix failure to unmap pte on highmem systems
mm: Add new ptep_deref() helper to fully encapsulate pte_t
mm: ptep_deref() conversion
.../drm/i915/gem/selftests/i915_gem_mman.c | 8 +-
drivers/misc/sgi-gru/grufault.c | 2 +-
drivers/vfio/vfio_iommu_type1.c | 7 +-
drivers/xen/privcmd.c | 2 +-
fs/proc/task_mmu.c | 33 +++---
fs/userfaultfd.c | 6 +-
include/linux/hugetlb.h | 4 +
include/linux/mm_inline.h | 2 +-
include/linux/pgtable.h | 13 ++-
kernel/events/uprobes.c | 2 +-
mm/damon/ops-common.c | 18 ++-
mm/damon/ops-common.h | 4 +-
mm/damon/paddr.c | 6 +-
mm/damon/vaddr.c | 14 ++-
mm/filemap.c | 2 +-
mm/gup.c | 21 ++--
mm/highmem.c | 12 +-
mm/hmm.c | 2 +-
mm/huge_memory.c | 4 +-
mm/hugetlb.c | 2 +-
mm/hugetlb_vmemmap.c | 6 +-
mm/kasan/init.c | 9 +-
mm/kasan/shadow.c | 10 +-
mm/khugepaged.c | 24 ++--
mm/ksm.c | 22 ++--
mm/madvise.c | 6 +-
mm/mapping_dirty_helpers.c | 4 +-
mm/memcontrol.c | 4 +-
mm/memory-failure.c | 6 +-
mm/memory.c | 105 +++++++++---------
mm/mempolicy.c | 6 +-
mm/migrate.c | 14 ++-
mm/migrate_device.c | 14 ++-
mm/mincore.c | 2 +-
mm/mlock.c | 6 +-
mm/mprotect.c | 8 +-
mm/mremap.c | 2 +-
mm/page_table_check.c | 4 +-
mm/page_vma_mapped.c | 26 +++--
mm/pgtable-generic.c | 2 +-
mm/rmap.c | 32 +++---
mm/sparse-vmemmap.c | 8 +-
mm/swap_state.c | 4 +-
mm/swapfile.c | 16 +--
mm/userfaultfd.c | 4 +-
mm/vmalloc.c | 16 ++-
mm/vmscan.c | 14 ++-
virt/kvm/kvm_main.c | 9 +-
48 files changed, 310 insertions(+), 237 deletions(-)
--
2.25.1
