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linux/mm
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James Houghton b30c14cd61 hugetlb: unshare some PMDs when splitting VMAs 
PMD sharing can only be done in PUD_SIZE-aligned pieces of VMAs; however,
it is possible that HugeTLB VMAs are split without unsharing the PMDs
first.

Without this fix, it is possible to hit the uffd-wp-related WARN_ON_ONCE
in hugetlb_change_protection [1].  The key there is that
hugetlb_unshare_all_pmds will not attempt to unshare PMDs in
non-PUD_SIZE-aligned sections of the VMA.

It might seem ideal to unshare in hugetlb_vm_op_open, but we need to
unshare in both the new and old VMAs, so unsharing in hugetlb_vm_op_split
seems natural.

[1]: https://lore.kernel.org/linux-mm/CADrL8HVeOkj0QH5VZZbRzybNE8CG-tEGFshnA+bG9nMgcWtBSg@mail.gmail.com/

Link: https://lkml.kernel.org/r/20230104231910.1464197-1-jthoughton@google.com
Fixes: 6dfeaff93be1 ("hugetlb/userfaultfd: unshare all pmds for hugetlbfs when register wp")
Signed-off-by: James Houghton <jthoughton@google.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-01-11 16:14:20 -08:00
..
damon
mm/damon: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
kasan
hardening updates for v6.2-rc1
2022-12-14 12:20:00 -08:00
kfence
hardening updates for v6.2-rc1
2022-12-14 12:20:00 -08:00
kmsan
kmsan: export kmsan_handle_urb
2022-12-21 14:31:52 -08:00
backing-dev.c
mm: add /sys/class/bdi/<bdi>/min_ratio_fine knob
2022-11-30 15:59:06 -08:00
balloon_compaction.c
mm: Convert all PageMovable users to movable_operations
2022-08-02 12:34:03 -04:00
bootmem_info.c
bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem
2022-08-28 14:02:45 -07:00
cma_debug.c
mm/cma_debug: show complete cma name in debugfs directories
2022-09-11 20:25:50 -07:00
cma_sysfs.c
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
cma.c
Revert "mm/cma.c: remove redundant cma_mutex lock"
2022-05-13 15:11:26 -07:00
cma.h
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
compaction.c
mm, compaction: fix fast_isolate_around() to stay within boundaries
2022-11-30 15:59:07 -08:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm: remove unused savedwrite infrastructure
2022-11-30 15:58:49 -08:00
debug.c
mm,thp,rmap: simplify compound page mapcount handling
2022-11-30 15:58:46 -08:00
dmapool.c
mm/dmapool.c: revert "make dma pool to use kmalloc_node"
2022-01-15 16:30:28 +02:00
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
mm/fadvise: use LLONG_MAX instead of -1 for eof
2022-12-11 18:12:11 -08:00
failslab.c
mm: fix unexpected changes to {failslab|fail_page_alloc}.attr
2022-11-22 18:50:44 -08:00
filemap.c
filemap: convert replace_page_cache_page() to replace_page_cache_folio()
2022-12-11 18:12:12 -08:00
folio-compat.c
folio-compat: remove lru_cache_add()
2022-12-11 18:12:13 -08:00
frontswap.c
frontswap: don't call ->init if no ops are registered
2022-09-26 12:14:34 -07:00
gup_test.c
mm/gup_test: free memory allocated via kvcalloc() using kvfree()
2022-12-15 16:37:48 -08:00
gup_test.h
mm/gup_test: start/stop/read functionality for PIN LONGTERM test
2022-11-08 17:37:15 -08:00
gup.c
New Feature:
2022-12-17 14:06:53 -06:00
highmem.c
highmem: fix kmap_to_page() for kmap_local_page() addresses
2022-10-12 18:51:51 -07:00
hmm.c
mm: Remove pointless barrier() after pmdp_get_lockless()
2022-12-15 10:37:27 -08:00
huge_memory.c
ARM64:
2022-12-15 11:12:21 -08:00
hugetlb_cgroup.c
mm/hugeltb_cgroup: convert hugetlb_cgroup_commit_charge*() to folios
2022-11-30 15:58:43 -08:00
hugetlb_vmemmap.c
mm/hugetlb_vmemmap: remap head page to newly allocated page
2022-11-30 15:58:47 -08:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability
2022-08-08 18:06:43 -07:00
hugetlb.c
hugetlb: unshare some PMDs when splitting VMAs
2023-01-11 16:14:20 -08:00
hwpoison-inject.c
mm/hwpoison: add __init/__exit annotations to module init/exit funcs
2022-10-03 14:03:05 -07:00
init-mm.c
mm: remove rb tree.
2022-09-26 19:46:16 -07:00
internal.h
mm/hwpoison: introduce per-memory_block hwpoison counter
2022-11-08 17:37:22 -08:00
interval_tree.c
mm/interval_tree: add comments to improve code readability
2021-04-30 11:20:38 -07:00
io-mapping.c
mm: add a io_mapping_map_user helper
2021-04-30 11:20:39 -07:00
ioremap.c
mm: ioremap: Add ioremap/iounmap_allowed()
2022-06-27 12:22:31 +01:00
Kconfig
New Feature:
2022-12-17 14:06:53 -06:00
Kconfig.debug
mm, slub: add CONFIG_SLUB_TINY
2022-11-27 23:38:02 +01:00
khugepaged.c
mm/MADV_COLLAPSE: don't expand collapse when vm_end is past requested end
2023-01-11 16:14:20 -08:00
kmemleak.c
mm/kmemleak: use %pK to display kernel pointers in backtrace
2022-12-15 16:37:49 -08:00
ksm.c
mm/ksm: convert break_ksm() to use walk_page_range_vma()
2022-12-11 18:12:09 -08:00
list_lru.c
mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe
2022-06-16 19:48:31 -07:00
maccess.c
maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault()
2022-11-11 11:44:46 -08:00
madvise.c
MM patches for 6.2-rc1.
2022-12-13 19:29:45 -08:00
Makefile
mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol
2022-10-03 14:03:36 -07:00
mapping_dirty_helpers.c
mm: Rename pmd_read_atomic()
2022-12-15 10:37:27 -08:00
memblock.c
memblock: Fix doc for memblock_phys_free
2023-01-04 12:31:22 +02:00
memcontrol.c
mm: memcg: fix swapcached stat accounting
2022-12-11 18:12:20 -08:00
memfd.c
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-05 11:08:32 -08:00
memory_hotplug.c
mm: add pageblock_aligned() macro
2022-10-03 14:03:04 -07:00
memory-failure.c
mm/memory-failure.c: cleanup in unpoison_memory
2022-11-30 15:59:08 -08:00
memory-tiers.c
mm/demotion: fix NULL vs IS_ERR checking in memory_tier_init
2022-11-30 15:58:54 -08:00
memory.c
mm: remove VM_FAULT_WRITE
2022-12-11 18:12:08 -08:00
mempolicy.c
mm/mempolicy: fix memory leak in set_mempolicy_home_node system call
2022-12-21 14:31:51 -08:00
mempool.c
mempool: do not use ksize() for poisoning
2022-11-30 15:58:41 -08:00
memremap.c
mm/memremap.c: map FS_DAX device memory as decrypted
2022-11-08 15:57:23 -08:00
memtest.c
…
migrate_device.c
mm/migrate_device: return number of migrating pages in args->cpages
2022-11-22 18:50:43 -08:00
migrate.c
MM patches for 6.2-rc1.
2022-12-13 19:29:45 -08:00
mincore.c
mm: convert find_get_incore_page() to filemap_get_incore_folio()
2022-11-08 17:37:18 -08:00
mlock.c
mm/mlock: drop dead code in count_mm_mlocked_page_nr()
2022-09-26 19:46:27 -07:00
mm_init.c
memory: move hotplug memory notifier priority to same file for easy sorting
2022-11-08 17:37:17 -08:00
mm_slot.h
mm: introduce common struct mm_slot
2022-10-03 14:02:43 -07:00
mmap_lock.c
mm: mmap_lock: fix disabling preemption directly
2021-07-23 17:43:28 -07:00
mmap.c
mm/userfaultfd: enable writenotify while userfaultfd-wp is enabled for a VMA
2023-01-11 16:14:20 -08:00
mmu_gather.c
mm: mmu_gather: allow more than one batch of delayed rmaps
2022-12-11 18:12:21 -08:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-21 20:01:10 -07:00
mmzone.c
mm: multi-gen LRU: groundwork
2022-09-26 19:46:09 -07:00
mprotect.c
New Feature:
2022-12-17 14:06:53 -06:00
mremap.c
mm, mremap: fix mremap() expanding vma with addr inside vma
2022-12-21 14:31:51 -08:00
msync.c
mm/msync: use vma_find() instead of vma linked list
2022-09-26 19:46:25 -07:00
nommu.c
mm: remove the vma linked list
2022-09-26 19:46:26 -07:00
oom_kill.c
mm: reduce noise in show_mem for lowmem allocations
2022-09-26 19:46:29 -07:00
page_alloc.c
mm/page_alloc: update comments in __free_pages_ok()
2022-12-11 18:12:17 -08:00
page_counter.c
mm: page_counter: remove unneeded atomic ops for low/min
2022-09-11 20:26:01 -07:00
page_ext.c
Merge branch 'mm-hotfixes-stable' into mm-stable
2022-11-30 14:58:42 -08:00
page_idle.c
mm: don't be stuck to rmap lock on reclaim path
2022-05-19 14:08:54 -07:00
page_io.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
page_isolation.c
mm/page_isolation: fix clang deadcode warning
2022-10-28 13:37:22 -07:00
page_owner.c
mm: reuse pageblock_start/end_pfn() macro
2022-10-03 14:03:03 -07:00
page_poison.c
mm: page_poison: print page info when corruption is caught
2021-04-30 11:20:36 -07:00
page_reporting.c
mm/page_reporting: Add checks for page_reporting_order param
2022-11-28 16:48:19 +00:00
page_reporting.h
mm/page_reporting: export reporting order as module parameter
2021-06-29 10:53:47 -07:00
page_table_check.c
mm: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
page_vma_mapped.c
mm/swap: add swp_offset_pfn() to fetch PFN from swap entry
2022-09-26 19:46:05 -07:00
page-writeback.c
mm: add bdi_set_min_ratio_no_scale() function
2022-11-30 15:59:06 -08:00
pagewalk.c
mm/pagewalk: add walk_page_range_vma()
2022-12-11 18:12:08 -08:00
percpu-internal.h
percpu: improve percpu_alloc_percpu event trace
2022-05-13 07:20:18 -07:00
percpu-km.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu-stats.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu.c
mm/percpu.c: remove the lcm code since block size is fixed at page size
2022-11-07 22:59:18 -08:00
pgalloc-track.h
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
pgtable-generic.c
mm: avoid unnecessary flush on change_huge_pmd()
2022-05-13 07:20:05 -07:00
process_vm_access.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
ptdump.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-03 10:13:13 -07:00
readahead.c
mm: add PSI accounting around ->read_folio and ->readahead calls
2022-09-20 08:24:38 -06:00
rmap.c
mm,thp,rmap: fix races between updates of subpages_mapcount
2022-12-11 18:12:20 -08:00
rodata_test.c
mm/rodata_test: use PAGE_ALIGNED() helper
2022-10-03 14:03:05 -07:00
secretmem.c
mm/secretmem: remove reduntant return value
2022-10-03 14:03:36 -07:00
shmem.c
mm/shmem: restore SHMEM_HUGE_DENY precedence over MADV_COLLAPSE
2023-01-11 16:14:20 -08:00
shrinker_debug.c
mm: shrinkers: fix double kfree on shrinker name
2022-07-29 18:07:13 -07:00
shuffle.c
mm/shuffle: convert module_param_call to module_param_cb
2022-10-03 14:03:07 -07:00
shuffle.h
mm/shuffle: fix section mismatch warning
2021-05-22 15:09:07 -10:00
slab_common.c
hardening updates for v6.2-rc1
2022-12-14 12:20:00 -08:00
slab.c
Merge branch 'slab/for-6.2/kmalloc_redzone' into slab/for-next
2022-11-21 10:36:09 +01:00
slab.h
Merge branch 'slub-tiny-v1r6' into slab/for-next
2022-12-01 00:14:00 +01:00
slob.c
Merge branch 'slab/for-6.1/kmalloc_size_roundup' into slab/for-next
2022-09-29 11:30:55 +02:00
slub.c
MM patches for 6.2-rc1.
2022-12-13 19:29:45 -08:00
sparse-vmemmap.c
mm/sparse-vmemmap: generalise vmemmap_populate_hugepages()
2022-12-11 18:12:12 -08:00
sparse.c
mm/hwpoison: introduce per-memory_block hwpoison counter
2022-11-08 17:37:22 -08:00
swap_cgroup.c
mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled
2022-10-03 14:03:36 -07:00
swap_slots.c
mm/swap: convert put_swap_page() to put_swap_folio()
2022-10-03 14:02:46 -07:00
swap_state.c
mm: mmu_gather: prepare to gather encoded page pointers with flags
2022-11-30 15:58:50 -08:00
swap.c
mm: teach release_pages() to take an array of encoded page pointers too
2022-11-30 15:58:50 -08:00
swap.h
mm: convert find_get_incore_page() to filemap_get_incore_folio()
2022-11-08 17:37:18 -08:00
swapfile.c
MM patches for 6.2-rc1.
2022-12-13 19:29:45 -08:00
truncate.c
folio-compat: remove lru_cache_add()
2022-12-11 18:12:13 -08:00
usercopy.c
mm: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
userfaultfd.c
New Feature:
2022-12-17 14:06:53 -06:00
util.c
mm,thp,rmap: simplify compound page mapcount handling
2022-11-30 15:58:46 -08:00
vmalloc.c
mm: vmalloc: use trace_free_vmap_area_noflush event
2022-11-08 17:37:17 -08:00
vmpressure.c
mm/vmpressure: fix data-race with memcg->socket_pressure
2021-11-06 13:30:40 -07:00
vmscan.c
New Feature:
2022-12-17 14:06:53 -06:00
vmstat.c
mm: vmscan: split khugepaged stats from direct reclaim stats
2022-11-30 15:58:41 -08:00
workingset.c
folio-compat: remove lru_cache_add()
2022-12-11 18:12:13 -08:00
z3fold.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zbud.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zpool.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zsmalloc.c
zsmalloc: implement writeback mechanism for zsmalloc
2022-12-11 18:12:10 -08:00
zswap.c
zswap: fix writeback lock ordering for zsmalloc
2022-12-11 18:12:09 -08:00