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Andrea Arcangeli ad33bb04b2 mm: thp: fix SMP race condition between THP page fault and MADV_DONTNEED 
pmd_trans_unstable()/pmd_none_or_trans_huge_or_clear_bad() were
introduced to locklessy (but atomically) detect when a pmd is a regular
(stable) pmd or when the pmd is unstable and can infinitely transition
from pmd_none() and pmd_trans_huge() from under us, while only holding
the mmap_sem for reading (for writing not).

While holding the mmap_sem only for reading, MADV_DONTNEED can run from
under us and so before we can assume the pmd to be a regular stable pmd
we need to compare it against pmd_none() and pmd_trans_huge() in an
atomic way, with pmd_trans_unstable().  The old pmd_trans_huge() left a
tiny window for a race.

Useful applications are unlikely to notice the difference as doing
MADV_DONTNEED concurrently with a page fault would lead to undefined
behavior.

[akpm@linux-foundation.org: tidy up comment grammar/layout]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-02-27 10:28:52 -08:00
..
kasan
UBSAN: run-time undefined behavior sanity checker
2016-01-20 17:09:18 -08:00
backing-dev.c
mm/backing-dev.c: fix error path in wb_init()
2016-02-11 18:35:48 -08:00
balloon_compaction.c
virtio_balloon: fix race between migration and ballooning
2016-01-12 20:47:06 +02:00
bootmem.c
x86/mm: Introduce max_possible_pfn
2015-12-06 12:46:31 +01:00
cleancache.c
cleancache: constify cleancache_ops structure
2016-01-27 09:09:57 -05:00
cma_debug.c
mm/cma_debug: correct size input to bitmap function
2015-07-17 16:39:54 -07:00
cma.c
mm/cma.c: suppress warning
2015-11-05 19:34:48 -08:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm/compaction.c: __compact_pgdat() code cleanuup
2016-01-14 16:00:49 -08:00
debug-pagealloc.c
mm/debug-pagealloc: make debug-pagealloc boottime configurable
2014-12-13 12:42:48 -08:00
debug.c
mm: rework mapcount accounting to enable 4k mapping of THPs
2016-01-15 17:56:32 -08:00
dmapool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
writeback: implement and use inode_congested()
2015-06-02 08:33:35 -06:00
failslab.c
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
filemap.c
mm: fix filemap.c kernel doc warning
2016-02-11 18:35:48 -08:00
frame_vector.c
mm: fix docbook comment for get_vaddr_frames()
2015-11-05 19:34:48 -08:00
frontswap.c
frontswap: allow multiple backends
2015-06-24 17:49:45 -07:00
gup.c
mm: retire GUP WARN_ON_ONCE that outlived its usefulness
2016-02-03 08:57:14 -08:00
highmem.c
mm/highmem: make kmap cache coloring aware
2014-08-06 18:01:22 -07:00
huge_memory.c
thp: call pmdp_invalidate() with correct virtual address
2016-02-24 10:46:30 -08:00
hugetlb_cgroup.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
hugetlb.c
mm/hugetlb.c: fix incorrect proc nr_hugepages value
2016-02-18 16:23:24 -08:00
hwpoison-inject.c
hwpoison: use page_cgroup_ino for filtering by memcg
2015-09-10 13:29:01 -07:00
init-mm.c
…
internal.h
mm: polish virtual memory accounting
2016-02-03 08:28:43 -08:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
mm/Kconfig: correct description of DEFERRED_STRUCT_PAGE_INIT
2016-02-05 18:10:40 -08:00
Kconfig.debug
mm/debug_pagealloc: remove obsolete Kconfig options
2015-01-08 15:10:52 -08:00
kmemcheck.c
mm/slab_common: move kmem_cache definition to internal header
2014-10-09 22:25:50 -04:00
kmemleak-test.c
mm/kmemleak-test.c: use pr_fmt for logging
2014-06-06 16:08:18 -07:00
kmemleak.c
Revert "gfp: add __GFP_NOACCOUNT"
2016-01-14 16:00:49 -08:00
ksm.c
mm/ksm.c: mark stable page dirty
2016-01-15 17:56:32 -08:00
list_lru.c
mm: memcontrol: move kmem accounting code to CONFIG_MEMCG
2016-01-20 17:09:18 -08:00
maccess.c
mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe
2015-11-05 19:34:48 -08:00
madvise.c
mm/huge_memory.c: don't split THP page when MADV_FREE syscall is called
2016-01-15 17:56:32 -08:00
Makefile
media updates for v4.3-rc1
2015-09-11 16:42:39 -07:00
memblock.c
memblock: don't mark memblock_phys_mem_size() as __init
2016-02-05 18:10:40 -08:00
memcontrol.c
thp: change pmd_trans_huge_lock() interface to return ptl
2016-01-21 17:20:51 -08:00
memory_hotplug.c
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
2016-01-15 17:56:32 -08:00
memory-failure.c
mm: soft-offline: exit with failure for non anonymous thp
2016-01-15 17:56:32 -08:00
memory.c
mm: thp: fix SMP race condition between THP page fault and MADV_DONTNEED
2016-02-27 10:28:52 -08:00
mempolicy.c
mempolicy: do not try to queue pages from !vma_migratable()
2016-02-05 18:10:40 -08:00
mempool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
thp: introduce deferred_split_huge_page()
2016-01-15 17:56:32 -08:00
mincore.c
thp: change pmd_trans_huge_lock() interface to return ptl
2016-01-21 17:20:51 -08:00
mlock.c
mm: fix mlock accouting
2016-01-21 17:20:51 -08:00
mm_init.c
mm: meminit: remove mminit_verify_page_links
2015-06-30 19:44:56 -07:00
mmap.c
mm: fix regression in remap_file_pages() emulation
2016-02-18 16:23:24 -08:00
mmu_context.c
sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm
2014-02-21 08:50:17 +01:00
mmu_notifier.c
mmu-notifier: add clear_young callback
2015-09-10 13:29:01 -07:00
mmzone.c
mm/mmzone.c: memmap_valid_within() can be boolean
2016-01-14 16:00:49 -08:00
mprotect.c
mm, dax: check for pmd_none() after split_huge_pmd()
2016-02-11 18:35:48 -08:00
mremap.c
mm, dax: check for pmd_none() after split_huge_pmd()
2016-02-11 18:35:48 -08:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
x86/mm: Introduce max_possible_pfn
2015-12-06 12:46:31 +01:00
nommu.c
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
oom_kill.c
mm, shmem: add internal shmem resident memory accounting
2016-01-14 16:00:49 -08:00
page_alloc.c
mm, hugetlb: don't require CMA for runtime gigantic pages
2016-02-05 18:10:40 -08:00
page_counter.c
mm: page_counter: let page_counter_try_charge() return bool
2015-11-05 19:34:48 -08:00
page_ext.c
mm: introduce idle page tracking
2015-09-10 13:29:01 -07:00
page_idle.c
mm: add page_check_address_transhuge() helper
2016-01-15 17:56:32 -08:00
page_io.c
fs: use helper bio_add_page() instead of open coding on bi_io_vec
2015-08-13 12:32:00 -06:00
page_isolation.c
mm/page_isolation: do some cleanup in "undo_isolate_page_range"
2016-01-15 17:56:32 -08:00
page_owner.c
mm/page_owner: set correct gfp_mask on page_owner
2015-07-17 16:39:54 -07:00
page-writeback.c
mm: page_alloc: generalize the dirty balance reserve
2016-01-14 16:00:49 -08:00
pagewalk.c
thp: rename split_huge_page_pmd() to split_huge_pmd()
2016-01-15 17:56:32 -08:00
percpu-km.c
percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated
2014-09-02 14:46:05 -04:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
tree wide: use kvfree() than conditional kfree()/vfree()
2016-01-22 17:02:18 -08:00
pgtable-generic.c
mm,thp: fix spellos in describing __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
2016-02-11 18:35:48 -08:00
process_vm_access.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
quicklist.c
…
readahead.c
mm: move lru_to_page to mm_inline.h
2016-01-14 16:00:49 -08:00
rmap.c
mm: fix locking order in mm_take_all_locks()
2016-01-15 17:56:32 -08:00
shmem.c
make sure that freeing shmem fast symlinks is RCU-delayed
2016-01-22 18:08:52 -05:00
slab_common.c
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
slab.c
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
slab.h
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
slob.c
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
slub.c
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
sparse-vmemmap.c
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
2016-01-15 17:56:32 -08:00
sparse.c
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
2016-01-15 17:56:32 -08:00
swap_cgroup.c
mm: page_cgroup: rename file to mm/swap_cgroup.c
2014-12-10 17:41:09 -08:00
swap_state.c
mm: memcontrol: charge swap to cgroup2
2016-01-20 17:09:18 -08:00
swap.c
mm, x86: get_user_pages() for dax mappings
2016-01-15 17:56:32 -08:00
swapfile.c
wrappers for ->i_mutex access
2016-01-22 18:04:28 -05:00
truncate.c
dax: support dirty DAX entries in radix tree
2016-01-22 17:02:18 -08:00
userfaultfd.c
memcg: adjust to support new THP refcounting
2016-01-15 17:56:32 -08:00
util.c
proc: revert /proc/<pid>/maps [stack:TID] annotation
2016-02-03 08:28:43 -08:00
vmacache.c
mm/vmacache: inline vmacache_valid_mm()
2015-11-05 19:34:48 -08:00
vmalloc.c
mm/vmalloc.c: use macro IS_ALIGNED to judge the aligment
2016-01-15 17:56:32 -08:00
vmpressure.c
mm/vmpressure.c: fix subtree pressure detection
2016-02-03 08:28:43 -08:00
vmscan.c
mm: downgrade VM_BUG in isolate_lru_page() to warning
2016-02-05 18:10:40 -08:00
vmstat.c
vmstat: make vmstat_update deferrable
2016-02-05 18:10:40 -08:00
workingset.c
dax: support dirty DAX entries in radix tree
2016-01-22 17:02:18 -08:00
zbud.c
mm/zbud.c: use list_last_entry() instead of list_tail_entry()
2016-01-15 11:40:52 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
zsmalloc: fix migrate_zspage-zs_free race condition
2016-01-20 17:09:18 -08:00
zswap.c
mm/zswap: change incorrect strncmp use to strcmp
2015-12-18 14:25:40 -08:00