Steven Price 8782fb61cc mm: pagewalk: Fix race between unmap and page walker ... The mmap lock protects the page walker from changes to the page tables during the walk. However a read lock is insufficient to protect those areas which don't have a VMA as munmap() detaches the VMAs before downgrading to a read lock and actually tearing down PTEs/page tables. For users of walk_page_range() the solution is to simply call pte_hole() immediately without checking the actual page tables when a VMA is not present. We now never call __walk_page_range() without a valid vma. For walk_page_range_novma() the locking requirements are tightened to require the mmap write lock to be taken, and then walking the pgd directly with 'no_vma' set. This in turn means that all page walkers either have a valid vma, or it's that special 'novma' case for page table debugging. As a result, all the odd '(!walk->vma && !walk->no_vma)' tests can be removed. Fixes: dd2283f260 ("mm: mmap: zap pages with read mmap_sem in munmap") Reported-by: Jann Horn <jannh@google.com> Signed-off-by: Steven Price <steven.price@arm.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2022-09-03 10:13:13 -07:00
..
damon	mm/damon/dbgfs: avoid duplicate context directory creation	2022-08-28 14:02:45 -07:00
kasan	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
kfence	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
backing-dev.c	writeback: avoid use-after-free after removing device	2022-08-28 14:02:43 -07:00
balloon_compaction.c	mm: Convert all PageMovable users to movable_operations	2022-08-02 12:34:03 -04:00
bootmem_info.c	bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem	2022-08-28 14:02:45 -07:00
cma_debug.c	mm/cma_debug.c: align the name buffer length as struct cma	2022-07-29 18:07:16 -07:00
cma_sysfs.c
cma.c	Revert "mm/cma.c: remove redundant cma_mutex lock"	2022-05-13 15:11:26 -07:00
cma.h
compaction.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
debug_page_ref.c
debug_vm_pgtable.c	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c	mm: fix missing handler for __GFP_NOWARN	2022-05-19 14:08:55 -07:00
filemap.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
folio-compat.c	mm/folio-compat: Remove migration compatibility functions	2022-08-02 12:34:04 -04:00
frontswap.c	docs: rename Documentation/vm to Documentation/mm	2022-06-27 12:52:53 -07:00
gup_test.c	mm: rename is_pinnable_page() to is_longterm_pinnable_page()	2022-07-17 17:14:27 -07:00
gup_test.h
gup.c	mm/gup: fix FOLL_FORCE COW security issue and remove FOLL_COW	2022-08-20 15:17:44 -07:00
highmem.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
hmm.c	mm/hmm: fault non-owner device private entries	2022-07-29 11:33:37 -07:00
huge_memory.c	mm/gup: fix FOLL_FORCE COW security issue and remove FOLL_COW	2022-08-20 15:17:44 -07:00
hugetlb_cgroup.c	hugetlb_cgroup: fix wrong hugetlb cgroup numa stat	2022-07-29 18:07:17 -07:00
hugetlb_vmemmap.c	mm: hugetlb_vmemmap: use PTRS_PER_PTE instead of PMD_SIZE / PAGE_SIZE	2022-08-08 18:06:43 -07:00
hugetlb_vmemmap.h	mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability	2022-08-08 18:06:43 -07:00
hugetlb.c	mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte	2022-08-28 14:02:43 -07:00
hwpoison-inject.c	mm/memory-failure: disable unpoison once hw error happens	2022-06-16 19:11:32 -07:00
init-mm.c
internal.h	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
interval_tree.c
io-mapping.c
ioremap.c	mm: ioremap: Add ioremap/iounmap_allowed()	2022-06-27 12:22:31 +01:00
Kconfig	cxl for 6.0	2022-08-10 11:07:26 -07:00
Kconfig.debug	Two followon fixes for the post-5.19 series "Use pageblock_order for cma	2022-05-27 11:40:49 -07:00
khugepaged.c	mm: khugepaged: reorg some khugepaged helpers	2022-07-17 17:14:33 -07:00
kmemleak.c	mm/kmemleak: prevent soft lockup in first object iteration loop of kmemleak_scan()	2022-06-16 19:48:32 -07:00
ksm.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
list_lru.c	mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe	2022-06-16 19:48:31 -07:00
maccess.c
madvise.c	mm: handling Non-LRU pages returned by vm_normal_pages	2022-07-17 17:14:28 -07:00
Makefile	mm: shrinkers: introduce debugfs interface for memory shrinkers	2022-07-03 18:08:40 -07:00
mapping_dirty_helpers.c
memblock.c	memblock updates for v5.20	2022-08-09 09:48:30 -07:00
memcontrol.c	mm: memcontrol: fix potential oom_lock recursion deadlock	2022-07-29 18:07:18 -07:00
memfd.c
memory_hotplug.c	mm: use is_zone_movable_page() helper	2022-07-29 18:07:20 -07:00
memory-failure.c	mm, hwpoison: enable memory error handling on 1GB hugepage	2022-08-08 18:06:44 -07:00
memory.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
mempolicy.c	mm/mempolicy: remove unneeded out label	2022-07-29 18:07:16 -07:00
mempool.c	mm/mempool: use might_alloc()	2022-06-16 19:48:30 -07:00
memremap.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
memtest.c
migrate_device.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
migrate.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
mincore.c	mm: teach core mm about pte markers	2022-05-13 07:20:09 -07:00
mlock.c	mm: handling Non-LRU pages returned by vm_normal_pages	2022-07-17 17:14:28 -07:00
mm_init.c
mmap_lock.c
mmap.c	mm/hugetlb: fix hugetlb not supporting softdirty tracking	2022-08-20 15:17:45 -07:00
mmu_gather.c
mmu_notifier.c
mmzone.c
mprotect.c	mm/mprotect: only reference swap pfn page if type match	2022-08-28 14:02:46 -07:00
mremap.c	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
msync.c
nommu.c	mm: nommu: pass a pointer to virt_to_page()	2022-07-17 17:14:37 -07:00
oom_kill.c	mm/oom_kill.c: fix vm_oom_kill_table[] ifdeffery	2022-06-01 15:57:16 -07:00
page_alloc.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
page_counter.c
page_ext.c
page_idle.c	mm: don't be stuck to rmap lock on reclaim path	2022-05-19 14:08:54 -07:00
page_io.c	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
page_isolation.c	mm/page_isolation.c: fix one kernel-doc comment	2022-06-16 19:11:30 -07:00
page_owner.c	Yang Shi has improved the behaviour of khugepaged collapsing of readonly	2022-05-26 12:32:41 -07:00
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c	Six hotfixes. One from Miaohe Lin is considered a minor thing so it isn't	2022-05-27 11:29:35 -07:00
page_vma_mapped.c	mm/page_vma_mapped.c: use helper function huge_pte_lock	2022-07-17 17:14:47 -07:00
page-writeback.c	writeback: avoid use-after-free after removing device	2022-08-28 14:02:43 -07:00
pagewalk.c	mm: pagewalk: Fix race between unmap and page walker	2022-09-03 10:13:13 -07:00
percpu-internal.h	percpu: improve percpu_alloc_percpu event trace	2022-05-13 07:20:18 -07:00
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c	mm: percpu: use kmemleak_ignore_phys() instead of kmemleak_free()	2022-07-17 17:14:47 -07:00
pgalloc-track.h
pgtable-generic.c	mm: avoid unnecessary flush on change_huge_pmd()	2022-05-13 07:20:05 -07:00
process_vm_access.c
ptdump.c	mm: pagewalk: Fix race between unmap and page walker	2022-09-03 10:13:13 -07:00
readahead.c	filemap: Fix serialization adding transparent huge pages to page cache	2022-06-23 12:22:00 -04:00
rmap.c	mm/rmap: Fix anon_vma->degree ambiguity leading to double-reuse	2022-08-31 15:45:10 -07:00
rodata_test.c
secretmem.c	Folio changes for 6.0	2022-08-03 10:35:43 -07:00
shmem.c	shmem: update folio if shmem_replace_page() updates the page	2022-08-28 14:02:43 -07:00
shrinker_debug.c	mm: shrinkers: fix double kfree on shrinker name	2022-07-29 18:07:13 -07:00
shuffle.c
shuffle.h
slab_common.c	mm/slab_common: Deleting kobject in kmem_cache_destroy() without holding slab_mutex/cpu_hotplug_lock	2022-09-01 12:10:31 +02:00
slab.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
slab.h	mm/slab_common: move generic bulk alloc/free functions to SLOB	2022-07-20 13:30:12 +02:00
slob.c	mm/slab_common: move generic bulk alloc/free functions to SLOB	2022-07-20 13:30:12 +02:00
slub.c	mm/sl[au]b: use own bulk free function when bulk alloc failed	2022-07-20 13:30:11 +02:00
sparse-vmemmap.c	mm: hugetlb_vmemmap: move vmemmap code related to HugeTLB to hugetlb_vmemmap.c	2022-08-08 18:06:42 -07:00
sparse.c	mm: memory_hotplug: enumerate all supported section flags	2022-07-03 18:08:49 -07:00
swap_cgroup.c
swap_slots.c	arm64: enable THP_SWAP for arm64	2022-07-20 10:52:40 +01:00
swap_state.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
swap.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
swap.h	mm/khugepaged: try to free transhuge swapcache when possible	2022-07-03 18:08:52 -07:00
swapfile.c	mm/swap: convert delete_from_swap_cache() to take a folio	2022-07-03 18:08:48 -07:00
truncate.c	mm: Remove __delete_from_page_cache()	2022-06-29 08:51:05 -04:00
usercopy.c	usercopy: use unsigned long instead of uintptr_t	2022-07-01 17:03:38 -07:00
userfaultfd.c	mm/uffd: reset write protection when unregister with wp-mode	2022-08-20 15:17:45 -07:00
util.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
vmacache.c
vmalloc.c	mm/vmalloc: extend __find_vmap_area() with one more argument	2022-07-03 18:08:41 -07:00
vmpressure.c
vmscan.c	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
vmstat.c	mm: add DEVICE_ZONE to FOR_ALL_ZONES	2022-08-20 15:17:45 -07:00
workingset.c	mm: shrinkers: provide shrinkers with names	2022-07-03 18:08:40 -07:00
z3fold.c	mm: Convert all PageMovable users to movable_operations	2022-08-02 12:34:03 -04:00
zbud.c
zpool.c
zsmalloc.c	mm/zsmalloc: do not attempt to free IS_ERR handle	2022-08-28 14:02:44 -07:00
zswap.c	zswap: memcg accounting	2022-05-19 14:08:53 -07:00