Mike Kravetz 17183187dc hugetlb: really allocate vma lock for all sharable vmas ...

commit e700898fa075c69b3ae02b702ab57fb75e1a82ec upstream.

Commit bbff39cc6c ("hugetlb: allocate vma lock for all sharable vmas")
removed the pmd sharable checks in the vma lock helper routines.  However,
it left the functional version of helper routines behind #ifdef
CONFIG_ARCH_WANT_HUGE_PMD_SHARE.  Therefore, the vma lock is not being
used for sharable vmas on architectures that do not support pmd sharing.
On these architectures, a potential fault/truncation race is exposed that
could leave pages in a hugetlb file past i_size until the file is removed.

Move the functional vma lock helpers outside the ifdef, and remove the
non-functional stubs.  Since the vma lock is not just for pmd sharing,
rename the routine __vma_shareable_flags_pmd.

Link: https://lkml.kernel.org/r/20221212235042.178355-1-mike.kravetz@oracle.com
Fixes: bbff39cc6c ("hugetlb: allocate vma lock for all sharable vmas")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-01-07 11:11:55 +01:00

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damon

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kasan

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kfence

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kmsan

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backing-dev.c

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balloon_compaction.c

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bootmem_info.c

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cma_debug.c

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cma_sysfs.c

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cma.c

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cma.h

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compaction.c

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debug_page_ref.c

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debug_vm_pgtable.c

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debug.c

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dmapool.c

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early_ioremap.c

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fadvise.c

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failslab.c

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filemap.c

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folio-compat.c

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frontswap.c

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gup_test.c

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gup_test.h

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gup.c

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highmem.c

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hmm.c

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huge_memory.c

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hugetlb_cgroup.c

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hugetlb_vmemmap.c

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hugetlb_vmemmap.h

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hugetlb.c

hugetlb: really allocate vma lock for all sharable vmas

2023-01-07 11:11:55 +01:00

hwpoison-inject.c

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init-mm.c

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internal.h

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interval_tree.c

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io-mapping.c

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ioremap.c

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Kconfig

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Kconfig.debug

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khugepaged.c

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kmemleak.c

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ksm.c

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list_lru.c

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maccess.c

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madvise.c

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Makefile

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mapping_dirty_helpers.c

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memblock.c

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memcontrol.c

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memfd.c

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memory_hotplug.c

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memory-failure.c

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memory-tiers.c

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memory.c

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mempolicy.c

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mempool.c

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memremap.c

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memtest.c

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migrate_device.c

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migrate.c

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mincore.c

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mlock.c

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mm_init.c

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mm_slot.h

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mmap_lock.c

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mmap.c

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mmu_gather.c

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mmu_notifier.c

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mmzone.c

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mprotect.c

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mremap.c

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msync.c

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nommu.c

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oom_kill.c

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page_alloc.c

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page_counter.c

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page_ext.c

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page_idle.c

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page_io.c

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page_isolation.c

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page_owner.c

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page_poison.c

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page_reporting.c

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page_reporting.h

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page_table_check.c

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page_vma_mapped.c

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page-writeback.c

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pagewalk.c

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percpu-internal.h

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percpu-km.c

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percpu-stats.c

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percpu-vm.c

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percpu.c

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pgalloc-track.h

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pgtable-generic.c

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process_vm_access.c

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ptdump.c

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readahead.c

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rmap.c

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rodata_test.c

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secretmem.c

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shmem.c

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shrinker_debug.c

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shuffle.c

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shuffle.h

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slab_common.c

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slab.c

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slab.h

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slob.c

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slub.c

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sparse-vmemmap.c

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sparse.c

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swap_cgroup.c

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swap_slots.c

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swap_state.c

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swap.c

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swap.h

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swapfile.c

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truncate.c

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usercopy.c

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userfaultfd.c

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util.c

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vmalloc.c

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vmpressure.c

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vmscan.c

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vmstat.c

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workingset.c

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z3fold.c

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zbud.c

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zpool.c

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zsmalloc.c

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zswap.c

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