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Paolo Bonzini a04cb99c5d mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) 
commit 01e67e04c28170c47700c2c226d732bbfedb1ad0 upstream.

If an mremap() syscall with old_size=0 ends up in move_page_tables(), it
will call invalidate_range_start()/invalidate_range_end() unnecessarily,
i.e.  with an empty range.

This causes a WARN in KVM's mmu_notifier.  In the past, empty ranges
have been diagnosed to be off-by-one bugs, hence the WARNing.  Given the
low (so far) number of unique reports, the benefits of detecting more
buggy callers seem to outweigh the cost of having to fix cases such as
this one, where userspace is doing something silly.  In this particular
case, an early return from move_page_tables() is enough to fix the
issue.

Link: https://lkml.kernel.org/r/20220329173155.172439-1-pbonzini@redhat.com
Reported-by: syzbot+6bde52d89cfdf9f61425@syzkaller.appspotmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-13 20:59:22 +02:00
..
damon
mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'
2022-01-05 12:42:39 +01:00
kasan
kasan: fix quarantine conflicting with init_on_free
2022-03-08 19:12:38 +01:00
kfence
kfence: limit currently covered allocations when pool nearly full
2022-04-13 20:59:00 +02:00
backing-dev.c
mm: bdi: initialize bdi_min_ratio when bdi is unregistered
2021-12-14 10:57:11 +01:00
balloon_compaction.c
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
bootmem_info.c
mm/bootmem_info.c: mark __init on register_page_bootmem_info_section
2021-09-03 09:58:14 -07:00
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: use proper type for cma_[alloc|release]
2021-05-05 11:27:24 -07:00
cma.h
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
compaction.c
Merge branch 'akpm' (patches from Andrew)
2021-09-08 12:55:35 -07:00
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
mm, fadvise: improve the expensive remote LRU cache draining after FADV_DONTNEED
2020-10-13 18:38:29 -07:00
failslab.c
…
filemap.c
mm/filemap: Fix handling of THPs in generic_file_buffered_read()
2022-03-02 11:47:47 +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
Revert "mm/gup: small refactoring: simplify try_grab_page()"
2022-02-05 12:38:57 +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.c: allow VM_MIXEDMAP to work with hmm_range_fault
2022-01-27 11:05:43 +01:00
huge_memory.c
mm: filemap: check if THP has hwpoisoned subpage for PMD page fault
2021-10-28 17:18:55 -07:00
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
hugetlbfs: flush TLBs correctly after huge_pmd_unshare
2021-11-25 09:49:07 +01:00
hwpoison-inject.c
mm: hwpoison: don't drop slab caches for offlining non-LRU page
2021-09-03 09:58:15 -07:00
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: skip huge page collapse for special files
2021-10-28 17:18:55 -07:00
kmemleak.c
mm/kmemleak: reset tag when compare object pointer
2022-04-08 14:22:56 +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
ARM: 9115/1: mm/maccess: fix unaligned copy_{from,to}_kernel_nofault
2021-08-20 11:39:25 +01:00
madvise.c
Revert "mm: madvise: skip unmapped vma holes passed to process_madvise"
2022-04-08 14:22:56 +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: use kfree() to release kmalloced memblock regions
2022-03-02 11:48:10 +01:00
memcontrol.c
mm/memcontrol: return 1 from cgroup.memory __setup() handler
2022-04-08 14:24:13 +02:00
memfd.c
memfd: fix F_SEAL_WRITE after shmem huge page allocated
2022-03-08 19:12:48 +01:00
memory_hotplug.c
Merge branch 'akpm' (patches from Andrew)
2021-09-08 12:55:35 -07:00
memory-failure.c
mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page()
2021-12-29 12:28:58 +01:00
memory.c
mm,hwpoison: unmap poisoned page before invalidation
2022-04-08 14:22:56 +02:00
mempolicy.c
mempolicy: mbind_range() set_policy() after vma_merge()
2022-04-08 14:22:54 +02:00
mempool.c
kasan: use separate (un)poison implementation for integrated init
2021-06-04 19:32:21 +01:00
memremap.c
mm/memory_hotplug: remove nid parameter from arch_remove_memory()
2021-09-08 11:50:23 -07:00
memtest.c
…
migrate.c
mm/migrate: fix CPUHP state to update node demotion order
2021-10-18 20:22:03 -10:00
mincore.c
inode: make init and permission helpers idmapped mount aware
2021-01-24 14:27:16 +01:00
mlock.c
mm/mlock: fix two bugs in user_shm_lock()
2022-04-08 14:22:52 +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: return 1 from stack_guard_gap __setup() handler
2022-04-08 14:24:13 +02:00
mmu_gather.c
mm: eliminate "expecting prototype" kernel-doc warnings
2021-04-16 16:10:36 -07:00
mmu_notifier.c
mm/mmu_notifiers: ensure range_end() is paired with range_start()
2021-03-25 09:22:55 -07:00
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
mm, oom: do not trigger out_of_memory from the #PF
2021-11-18 19:17:16 +01:00
page_alloc.c
mm/pages_alloc.c: don't create ZONE_MOVABLE beyond the end of a node
2022-04-08 14:22:54 +02:00
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
swap: fix swapfile read/write offset
2021-03-02 17:25:46 -07:00
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
Merge branch 'akpm' (patches from Andrew)
2021-09-03 10:08:28 -07:00
pagewalk.c
mm: pagewalk: fix walk for hugepage tables
2021-06-29 10:53:49 -07:00
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: ptdump: fix build failure
2021-04-16 16:10:37 -07:00
readahead.c
mm: Protect operations adding pages to page cache with invalidate_lock
2021-07-13 13:14:27 +02:00
rmap.c
mm: fix race between MADV_FREE reclaim and blkdev direct IO read
2022-04-13 20:59:14 +02:00
rodata_test.c
mm/rodata_test.c: fix missing function declaration
2020-08-21 09:52:53 -07:00
secretmem.c
mm/secretmem: avoid letting secretmem_users drop to zero
2021-10-28 17:18:55 -07:00
shmem.c
shmem: fix a race between shmem_unused_huge_shrink and shmem_evict_inode
2022-01-27 11:03:01 +01:00
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: slub: move flush_cpu_slab() invocations __free_slab() invocations out of IRQ context
2021-09-04 01:12:23 +02:00
slab.c
mm: kfence: fix missing objcg housekeeping for SLAB
2022-04-08 14:22:46 +02:00
slab.h
mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag
2021-11-25 09:48:42 +01:00
slob.c
mm: Don't build mm_dump_obj() on CONFIG_PRINTK=n kernels
2021-03-08 14:18:46 -08:00
slub.c
mm/slub: fix endianness bug for alloc/free_traces attributes
2021-12-14 10:57:11 +01:00
sparse-vmemmap.c
mm: sparsemem: split the huge PMD mapping of vmemmap pages
2021-06-30 20:47:26 -07:00
sparse.c
mm: introduce memmap_alloc() to unify memory map allocation
2021-09-03 09:58:15 -07:00
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, memcg: inline swap-related functions to improve disabled memcg config
2021-09-03 09:58:12 -07:00
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: change mmap_changing to atomic
2021-09-03 09:58:16 -07:00
util.c
mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls
2022-03-08 19:12:44 +01:00
vmacache.c
…
vmalloc.c
mm: defer kmemleak object creation of module_alloc()
2022-03-08 19:12:38 +01:00
vmpressure.c
mm/vmpressure: replace vmpressure_to_css() with vmpressure_to_memcg()
2021-09-03 09:58:17 -07:00
vmscan.c
mm,vmscan: fix divide by zero in get_scan_count
2021-09-08 18:45:53 -07:00
vmstat.c
mm/vmstat: protect per cpu variables with preempt disable on RT
2021-09-08 15:32:34 -07:00
workingset.c
memcg: flush lruvec stats in the refault
2021-09-23 10:09:13 -07:00
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
mm/zsmalloc.c: close race window between zs_pool_dec_isolated() and zs_unregister_migration()
2021-11-18 19:17:10 +01:00
zswap.c
mm/zswap.c: fix two bugs in zswap_writeback_entry()
2021-06-30 20:47:31 -07:00