Jann Horn c231056732 mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths ... commit f268f6cf87 upstream. Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d215 ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f82731 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables. Link: https://lkml.kernel.org/r/20221129154730.2274278-3-jannh@google.com Link: https://lkml.kernel.org/r/20221128180252.1684965-3-jannh@google.com Link: https://lkml.kernel.org/r/20221125213714.4115729-3-jannh@google.com Fixes: f3f0e1d215 ("khugepaged: add support of collapse for tmpfs/shmem pages") Signed-off-by: Jann Horn <jannh@google.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Peter Xu <peterx@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> [manual backport: this code was refactored from two copies into a common helper between 5.15 and 6.0; pmd collapse for PTE-mapped THP was only added in 5.4; MMU notifier API changed between 4.19 and 5.4] Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-01-18 09:26:04 +01:00
..
kasan
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c
cma.c
cma.h
cma_debug.c
compaction.c
debug.c
debug_page_ref.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c	mm: fs: initialize fsdata passed to write_begin/write_end interface	2022-11-25 17:36:55 +01:00
frame_vector.c	v4l2: don't fall back to follow_pfn() if pin_user_pages_fast() fails	2022-12-08 11:16:33 +01:00
frontswap.c
gup.c
highmem.c
hmm.c
huge_memory.c
hugetlb.c	mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages	2022-11-03 23:50:54 +09:00
hugetlb_cgroup.c
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
Kconfig
Kconfig.debug
khugepaged.c	mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths	2023-01-18 09:26:04 +01:00
kmemleak-test.c
kmemleak.c	Revert "mm: kmemleak: take a full lowmem check in kmemleak_*_phys()"	2022-09-15 12:23:51 +02:00
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile
memblock.c
memcontrol.c	memcg: fix possible use-after-free in memcg_write_event_control()	2022-12-14 11:26:13 +01:00
memory-failure.c
memory.c	mm/khugepaged: fix GUP-fast interaction by sending IPI	2023-01-18 09:26:04 +01:00
memory_hotplug.c
mempolicy.c	mm/mempolicy: fix uninit-value in mpol_rebind_policy()	2022-07-29 17:06:50 +02:00
mempool.c
memtest.c
migrate.c	mm/migrate_device.c: flush TLB while holding PTL	2022-10-26 13:16:50 +02:00
mincore.c
mlock.c
mm_init.c
mmap.c	mm: Fix TLB flush for not-first PFNMAP mappings in unmap_region()	2022-09-20 11:51:30 +02:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c	mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)	2022-04-20 09:08:29 +02:00
msync.c
nobootmem.c
nommu.c
oom_kill.c
page-writeback.c
page_alloc.c	mm: prevent page_frag_alloc() from corrupting the memory	2022-10-26 13:16:49 +02:00
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c
page_owner.c
page_poison.c
page_vma_mapped.c
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c	mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse	2022-09-05 10:25:06 +02:00
rodata_test.c
shmem.c	memfd: fix F_SEAL_WRITE after shmem huge page allocated	2022-03-08 19:01:58 +01:00
slab.c
slab.h
slab_common.c
slob.c
slub.c	mm/slub: fix to return errno if kmalloc() fails	2022-09-28 10:56:50 +02:00
sparse-vmemmap.c
sparse.c
swap.c
swap_cgroup.c
swap_slots.c
swap_state.c
swapfile.c
truncate.c
usercopy.c
userfaultfd.c	mm: userfaultfd: fix missing cache flush in mcopy_atomic_pte() and __mcopy_atomic()	2022-05-15 19:40:27 +02:00
util.c	random: move randomize_page() into mm where it belongs	2022-06-25 11:46:40 +02:00
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c
vmstat.c
workingset.c
z3fold.c
zbud.c
zpool.c
zsmalloc.c	zsmalloc: fix races between asynchronous zspage free and page migration	2022-06-06 08:20:57 +02:00
zswap.c