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Lokesh Gidra bbc432e632 userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb 
commit 67695f18d55924b2013534ef3bdc363bc9e14605 upstream.

In mfill_atomic_hugetlb(), mmap_changing isn't being checked
again if we drop mmap_lock and reacquire it. When the lock is not held,
mmap_changing could have been incremented. This is also inconsistent
with the behavior in mfill_atomic().

Link: https://lkml.kernel.org/r/20240117223729.1444522-1-lokeshgidra@google.com
Fixes: df2cc96e77011 ("userfaultfd: prevent non-cooperative events vs mcopy_atomic races")
Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Nicolas Geoffray <ngeoffray@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-03-01 13:21:43 +01:00
..
damon
mm/damon/ops-common: atomically test and clear young on ptes and pmds
2023-07-23 13:47:47 +02:00
kasan
kasan: disable kasan_non_canonical_hook() for HW tags
2023-12-23 10:42:00 +01:00
kfence
mm: kfence: fix using kfence_metadata without initialization in show_object()
2023-03-30 12:48:01 +02:00
backing-dev.c
writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs
2023-05-11 23:00:18 +09:00
balloon_compaction.c
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
bootmem_info.c
bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem
2022-08-31 17:16:48 +02:00
cleancache.c
…
cma_debug.c
mm/cma: change cma mutex to irq safe spinlock
2021-05-05 11:27:21 -07:00
cma_sysfs.c
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
cma.c
mm/cma: use nth_page() in place of direct struct page manipulation
2023-11-28 16:56:31 +00:00
cma.h
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
compaction.c
mm, compaction: fix fast_isolate_around() to stay within boundaries
2023-01-12 11:58:47 +01:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug_vm_pgtable: remove pte entry from the page table
2022-02-08 18:34:05 +01:00
debug.c
mm/debug: sync up latest migrate_reason to migrate_reason_names
2021-09-24 16:13:35 -07:00
dmapool.c
mm/dmapool: use DEVICE_ATTR_RO macro
2021-06-29 10:53:52 -07:00
early_ioremap.c
mm/early_ioremap.c: remove redundant early_ioremap_shutdown()
2021-09-08 11:50:24 -07:00
fadvise.c
…
failslab.c
…
filemap.c
mm/filemap: avoid buffered read/write race to read inconsistent data
2024-01-05 15:13:39 +01:00
frontswap.c
mm/mempool: minor coding style tweaks
2021-05-05 11:27:27 -07:00
gup_test.c
selftests/vm: gup_test: test faulting in kernel, and verify pinnable pages
2021-05-05 11:27:26 -07:00
gup_test.h
selftests/vm: gup_test: fix test flag
2021-05-05 11:27:26 -07:00
gup.c
mm/migration: return errno when isolate_huge_page failed
2023-02-14 19:17:56 +01:00
highmem.c
highmem: fix checks in __kmap_local_sched_{in,out}
2022-04-13 20:59:21 +02:00
hmm.c
mm/hmm: fault non-owner device private entries
2022-08-03 12:03:54 +02:00
huge_memory.c
mm/userfaultfd: propagate uffd-wp bit when PTE-mapping the huge zeropage
2023-03-22 13:31:35 +01:00
hugetlb_cgroup.c
hugetlb: make free_huge_page irq safe
2021-05-05 11:27:22 -07:00
hugetlb_vmemmap.c
mm: hugetlb: introduce CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON
2021-06-30 20:47:26 -07:00
hugetlb_vmemmap.h
mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate
2021-06-30 20:47:25 -07:00
hugetlb.c
mm/migration: return errno when isolate_huge_page failed
2023-02-14 19:17:56 +01:00
hwpoison-inject.c
mm/hwpoison: avoid the impact of hwpoison_filter() return value on mce handler
2022-07-12 16:35:05 +02:00
init-mm.c
mm: add setup_initial_init_mm() helper
2021-07-08 11:48:21 -07:00
internal.h
mm/numa: automatically generate node migration order
2021-09-03 09:58:16 -07:00
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: move ioremap_page_range to vmalloc.c
2021-09-08 11:50:24 -07:00
Kconfig
kmap_local: don't assume kmap PTEs are linear arrays in memory
2021-11-25 09:48:43 +01:00
Kconfig.debug
mm, page_poison: remove CONFIG_PAGE_POISONING_ZERO
2020-12-15 12:13:46 -08:00
khugepaged.c
mm/khugepaged: check again on anon uffd-wp during isolation
2023-04-26 13:51:52 +02:00
kmemleak.c
Revert "mm: kmemleak: take a full lowmem check in kmemleak_*_phys()"
2022-09-15 11:30:00 +02:00
ksm.c
mm/ksm: remove old GCC 4.9+ check
2021-09-13 10:18:28 -07:00
list_lru.c
mm: vmscan: consolidate shrinker_maps handling code
2021-05-05 11:27:23 -07:00
maccess.c
maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault()
2022-11-26 09:24:47 +01:00
madvise.c
mm: fix madivse_pageout mishandling on non-LRU page
2022-10-05 10:39:39 +02:00
Makefile
mm: introduce Data Access MONitor (DAMON)
2021-09-08 11:50:24 -07:00
mapping_dirty_helpers.c
mm/mapping_dirty_helpers: remove double Note in kerneldoc
2021-07-01 11:06:02 -07:00
memblock.c
memblock: allow to specify flags with memblock_add_node()
2023-12-20 15:17:33 +01:00
memcontrol.c
mm: kmem: drop __GFP_NOFAIL when allocating objcg vectors
2023-11-28 16:56:35 +00:00
memfd.c
memfd: check for non-NULL file_seals in memfd_create() syscall
2023-06-28 10:29:45 +02:00
memory_hotplug.c
memblock: allow to specify flags with memblock_add_node()
2023-12-20 15:17:33 +01:00
memory-failure.c
mm/memory-failure: check the mapcount of the precise page
2024-01-15 18:51:21 +01:00
memory.c
mm: fix unmap_mapping_range high bits shift bug
2024-01-15 18:51:23 +01:00
mempolicy.c
migrate: hugetlb: check for hugetlb shared PMD in node migration
2023-02-14 19:17:56 +01:00
mempool.c
kasan: use separate (un)poison implementation for integrated init
2021-06-04 19:32:21 +01:00
memremap.c
mm/memremap.c: map FS_DAX device memory as decrypted
2022-11-16 09:58:27 +01:00
memtest.c
…
migrate.c
mm/migrate: fix do_pages_move for compat pointers
2023-11-08 17:26:36 +01:00
mincore.c
inode: make init and permission helpers idmapped mount aware
2021-01-24 14:27:16 +01:00
mlock.c
mm/mlock: fix potential imbalanced rlimit ucounts adjustment
2022-05-15 20:18:53 +02:00
mm_init.c
include/linux/page-flags-layout.h: cleanups
2021-04-30 11:20:42 -07:00
mmap_lock.c
mm: mmap_lock: fix disabling preemption directly
2021-07-23 17:43:28 -07:00
mmap.c
mm/mmap: undo ->mmap() when arch_validate_flags() fails
2022-10-26 12:34:24 +02:00
mmu_gather.c
mm/khugepaged: fix GUP-fast interaction by sending IPI
2022-12-14 11:37:17 +01:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-27 14:38:58 +02:00
mmzone.c
mm/lru: replace pgdat lru_lock with lruvec lock
2020-12-15 14:48:04 -08:00
mprotect.c
mm: don't try to NUMA-migrate COW pages that have other uses
2022-02-23 12:03:03 +01:00
mremap.c
mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)
2022-04-13 20:59:22 +02:00
msync.c
mm/msync: exit early when the flags is an MS_ASYNC and start < vm_start
2021-04-30 11:20:37 -07:00
nommu.c
Merge tag 'denywrite-for-5.15' of git://github.com/davidhildenbrand/linux
2021-09-04 11:35:47 -07:00
oom_kill.c
oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup
2022-04-27 14:38:58 +02:00
page_alloc.c
mm/page_alloc: correct start page when guard page debug is enabled
2023-11-08 17:26:36 +01:00
page_counter.c
mm: page_counter: mitigate consequences of a page_counter underflow
2021-04-30 11:20:38 -07:00
page_ext.c
mm/migrate: add CPU hotplug to demotion #ifdef
2021-10-18 20:22:02 -10:00
page_idle.c
mm/idle_page_tracking: make PG_idle reusable
2021-09-08 11:50:24 -07:00
page_io.c
mm: fix unexpected zeroed page mapping with zram swap
2022-04-20 09:34:18 +02:00
page_isolation.c
Merge branch 'akpm' (patches from Andrew)
2021-09-08 12:55:35 -07:00
page_owner.c
mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE
2021-09-08 11:50:22 -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: allow driver to specify reporting order
2021-06-29 10:53:47 -07:00
page_reporting.h
mm/page_reporting: export reporting order as module parameter
2021-06-29 10:53:47 -07:00
page_vma_mapped.c
mm: device exclusive memory access
2021-07-01 11:06:03 -07:00
page-writeback.c
mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again
2024-02-23 08:55:03 +01:00
pagewalk.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-08 12:28:05 +02:00
percpu-internal.h
Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
2021-07-01 17:17:24 -07:00
percpu-km.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu-stats.c
percpu: rework memcg accounting
2021-06-05 20:43:15 +00:00
percpu-vm.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu.c
Merge branch 'akpm' (patches from Andrew)
2021-09-08 12:55:35 -07:00
pgalloc-track.h
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
pgtable-generic.c
mm/thp: fix __split_huge_pmd_locked() on shmem migration entry
2021-06-16 09:24:42 -07:00
process_vm_access.c
mm/process_vm_access.c: remove duplicate include
2021-05-05 11:27:27 -07:00
ptdump.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-08 12:28:05 +02:00
readahead.c
vfs: fix readahead(2) on block devices
2023-11-20 11:08:13 +01:00
rmap.c
mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse
2022-09-05 10:30:07 +02:00
rodata_test.c
…
secretmem.c
mm: fix dereferencing possible ERR_PTR
2022-10-05 10:39:39 +02:00
shmem.c
tmpfs: verify {g,u}id mount options correctly
2023-09-19 12:22:30 +02:00
shuffle.c
mm: eliminate "expecting prototype" kernel-doc warnings
2021-04-16 16:10:36 -07:00
shuffle.h
mm/shuffle: fix section mismatch warning
2021-05-22 15:09:07 -10:00
slab_common.c
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-27 14:38:51 +02:00
slab.c
mm/slab: Fix undefined init_cache_node_node() for NUMA and !SMP
2023-03-30 12:47:56 +02:00
slab.h
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-27 14:38:51 +02:00
slob.c
mm, kfence: support kmem_dump_obj() for KFENCE objects
2022-04-27 14:38:51 +02:00
slub.c
mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context.
2022-09-28 11:11:44 +02:00
sparse-vmemmap.c
mm: sparsemem: split the huge PMD mapping of vmemmap pages
2021-06-30 20:47:26 -07:00
sparse.c
mm/sparsemem: fix race in accessing memory_section->usage
2024-02-23 08:54:34 +01:00
swap_cgroup.c
…
swap_slots.c
mm: Replace deprecated CPU-hotplug functions.
2021-08-28 01:46:17 +02:00
swap_state.c
mm: swap: get rid of livelock in swapin readahead
2022-03-23 09:16:41 +01:00
swap.c
mm: fs: invalidate bh_lrus for only cold path
2021-09-24 16:13:35 -07:00
swapfile.c
mm/swap: fix swap_info_struct race between swapoff and get_swap_pages()
2023-04-13 16:48:26 +02:00
truncate.c
Merge branch 'akpm' (patches from Andrew)
2021-09-03 10:08:28 -07:00
usercopy.c
mm/usercopy: return 1 from hardened_usercopy __setup() handler
2022-04-08 14:24:14 +02:00
userfaultfd.c
userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb
2024-03-01 13:21:43 +01:00
util.c
rcu: dump vmalloc memory info safely
2023-09-19 12:22:50 +02:00
vmacache.c
…
vmalloc.c
mm/vmalloc: add a safer version of find_vm_area() for debug
2023-09-19 12:22:50 +02:00
vmpressure.c
net-memcg: Fix scope of sockmem pressure indicators
2023-09-19 12:22:33 +02:00
vmscan.c
mm: __isolate_lru_page_prepare() in isolate_migratepages_block()
2022-12-08 11:28:44 +01:00
vmstat.c
mm/vmstat: protect per cpu variables with preempt disable on RT
2021-09-08 15:32:34 -07:00
workingset.c
memcg: sync flush only if periodic flush is delayed
2022-04-27 14:38:57 +02:00
z3fold.c
mm/z3fold: add kerneldoc fields for z3fold_pool
2021-07-01 11:06:03 -07:00
zbud.c
mm/zbud: add kerneldoc fields for zbud_pool
2021-07-01 11:06:03 -07:00
zpool.c
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
zsmalloc.c
zsmalloc: fix races between asynchronous zspage free and page migration
2022-06-06 08:43:39 +02:00
zswap.c
mm/zswap.c: fix two bugs in zswap_writeback_entry()
2021-06-30 20:47:31 -07:00