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linux-stable/mm
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Linus Torvalds 65d0db500d mm: avoid leaving partial pfn mappings around in error case 
commit 79a61cc3fc0466ad2b7b89618a6157785f0293b3 upstream.

As Jann points out, PFN mappings are special, because unlike normal
memory mappings, there is no lifetime information associated with the
mapping - it is just a raw mapping of PFNs with no reference counting of
a 'struct page'.

That's all very much intentional, but it does mean that it's easy to
mess up the cleanup in case of errors.  Yes, a failed mmap() will always
eventually clean up any partial mappings, but without any explicit
lifetime in the page table mapping itself, it's very easy to do the
error handling in the wrong order.

In particular, it's easy to mistakenly free the physical backing store
before the page tables are actually cleaned up and (temporarily) have
stale dangling PTE entries.

To make this situation less error-prone, just make sure that any partial
pfn mapping is torn down early, before any other error handling.

Reported-and-tested-by: Jann Horn <jannh@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Simona Vetter <simona.vetter@ffwll.ch>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-09-18 19:23:04 +02:00
..
damon
mm/damon/core: merge regions aggressively when max_nr_regions is unmet
2024-07-25 09:49:07 +02:00
kasan
kasan/test: avoid gcc warning for intentional overflow
2024-04-03 15:19:27 +02:00
kfence
mm,kfence: decouple kfence from page granularity mapping judgement
2023-12-03 07:32:08 +01:00
kmsan
kmsan: do not wipe out origin when doing partial unpoisoning
2024-06-16 13:41:38 +02:00
backing-dev.c
writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs
2023-04-26 14:28:39 +02:00
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: show complete cma name in debugfs directories
2022-09-11 20:25:50 -07:00
cma_sysfs.c
mm: cma: support sysfs
2021-05-05 11:27:24 -07:00
cma.c
mm/cma: drop incorrect alignment check in cma_init_reserved_mem
2024-06-16 13:41:39 +02:00
cma.h
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
compaction.c
mm, vmscan: prevent infinite loop for costly GFP_NOIO | __GFP_RETRY_MAYFAIL allocations
2024-04-03 15:19:42 +02:00
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
mm: remove the vma linked list
2022-09-26 19:46:26 -07:00
dmapool.c
mm/dmapool.c: revert "make dma pool to use kmalloc_node"
2022-01-15 16:30:28 +02:00
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
riscv: compat: syscall: Add compat_sys_call_table implementation
2022-04-26 13:36:25 -07:00
failslab.c
mm: fix unexpected changes to {failslab|fail_page_alloc}.attr
2022-11-22 18:50:44 -08:00
filemap.c
mm: merge folio_has_private()/filemap_release_folio() call pairs
2024-01-10 17:10:31 +01:00
folio-compat.c
mm: remove try_to_free_swap()
2022-10-03 14:02:53 -07:00
frontswap.c
frontswap: don't call ->init if no ops are registered
2022-09-26 12:14:34 -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
selftests/vm: gup_test: fix test flag
2021-05-05 11:27:26 -07:00
gup.c
mm: always expand the stack with the mmap write lock held
2023-07-01 13:16:25 +02:00
highmem.c
highmem: fix kmap_to_page() for kmap_local_page() addresses
2022-10-12 18:51:51 -07:00
hmm.c
mm/swap: add swp_offset_pfn() to fetch PFN from swap entry
2022-09-26 19:46:05 -07:00
huge_memory.c
mm/numa: no task_numa_fault() call if PMD is changed
2024-08-29 17:30:52 +02:00
hugetlb_cgroup.c
mm/hugetlb_cgroup: convert hugetlb_cgroup_uncharge_page() to folios
2024-05-17 11:55:52 +02:00
hugetlb_vmemmap.c
mm: hugetlb_vmemmap: fix a race between vmemmap pmd split
2023-09-19 12:27:56 +02:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability
2022-08-08 18:06:43 -07:00
hugetlb.c
mm/hugetlb: fix potential race in __update_and_free_hugetlb_folio()
2024-08-14 13:53:02 +02:00
hwpoison-inject.c
mm/hwpoison: add __init/__exit annotations to module init/exit funcs
2022-10-03 14:03:05 -07:00
init-mm.c
mm: remove rb tree.
2022-09-26 19:46:16 -07:00
internal.h
mm, netfs, fscache: stop read optimisation when folio removed from pagecache
2024-01-10 17:10:31 +01:00
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: ioremap: Add ioremap/iounmap_allowed()
2022-06-27 12:22:31 +01:00
Kconfig
mm: restrict the pcp batch scale factor to avoid too long latency
2024-08-11 12:35:53 +02:00
Kconfig.debug
mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM
2023-06-14 11:15:29 +02:00
khugepaged.c
mm: khugepaged: fix kernel BUG in hpage_collapse_scan_file()
2024-08-29 17:30:17 +02:00
kmemleak.c
mm/kmemleak: prevent soft lockup in kmemleak_scan()'s object iteration loops
2022-10-28 13:37:22 -07:00
ksm.c
mm/ksm: fix race with VMA iteration and mm_struct teardown
2023-03-30 12:49:29 +02:00
list_lru.c
mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe
2022-06-16 19:48:31 -07:00
maccess.c
mm: Fix copy_from_user_nofault().
2023-06-28 11:12:17 +02:00
madvise.c
madvise:madvise_free_pte_range(): don't use mapcount() against large folio for sharing check
2023-08-30 16:11:11 +02:00
Makefile
mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol
2022-10-03 14:03:36 -07:00
mapping_dirty_helpers.c
mm: move tlb_flush_pending inline helpers to mm_inline.h
2022-01-15 16:30:27 +02:00
memblock.c
x86/numa: Fix the address overlap check in numa_fill_memblks()
2024-03-01 13:26:36 +01:00
memcontrol.c
memcg: protect concurrent access to mem_cgroup_idr
2024-09-12 11:10:29 +02:00
memfd.c
memfd: check for non-NULL file_seals in memfd_create() syscall
2023-06-28 11:12:27 +02:00
memory_hotplug.c
x86/kaslr: Expose and use the end of the physical memory address space
2024-09-12 11:10:17 +02:00
memory-failure.c
mm/memory-failure: use raw_spinlock_t in struct memory_failure_cpu
2024-08-29 17:30:15 +02:00
memory-tiers.c
memory tier: release the new_memtier in find_create_memory_tier()
2023-03-10 09:34:27 +01:00
memory.c
mm: avoid leaving partial pfn mappings around in error case
2024-09-18 19:23:04 +02:00
mempolicy.c
mm/numa_balancing: teach mpol_to_str about the balancing mode
2024-08-03 08:49:40 +02:00
mempool.c
mm/mempool: use might_alloc()
2022-06-16 19:48:30 -07:00
memremap.c
mm/memremap.c: map FS_DAX device memory as decrypted
2022-11-08 15:57:23 -08:00
memtest.c
memtest: use {READ,WRITE}_ONCE in memory scanning
2024-04-03 15:19:36 +02:00
migrate_device.c
mm/migrate_device: return number of migrating pages in args->cpages
2022-11-22 18:50:43 -08:00
migrate.c
mm/hugetlb: add folio_hstate()
2024-05-17 11:55:52 +02:00
mincore.c
mm: teach mincore_hugetlb about pte markers
2023-03-22 13:34:03 +01:00
mlock.c
mm/mlock: drop dead code in count_mm_mlocked_page_nr()
2022-09-26 19:46:27 -07:00
mm_init.c
mm: multi-gen LRU: groundwork
2022-09-26 19:46:09 -07:00
mm_slot.h
mm: introduce common struct mm_slot
2022-10-03 14:02:43 -07:00
mmap_lock.c
mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer
2024-08-03 08:49:30 +02:00
mmap.c
mmap: fix error paths with dup_anon_vma()
2023-11-08 14:11:03 +01:00
mmu_gather.c
mm/khugepaged: fix GUP-fast interaction by sending IPI
2022-11-30 14:49:42 -08:00
mmu_notifier.c
mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove()
2022-04-21 20:01:10 -07:00
mmzone.c
mm: multi-gen LRU: groundwork
2022-09-26 19:46:09 -07:00
mprotect.c
mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in
2022-10-12 15:56:46 -07:00
mremap.c
mm, mremap: fix mremap() expanding for vma's with vm_ops->close()
2023-02-09 11:28:22 +01:00
msync.c
mm/msync: use vma_find() instead of vma linked list
2022-09-26 19:46:25 -07:00
nommu.c
xtensa: fix lock_mm_and_find_vma in case VMA not found
2023-07-05 18:27:37 +01:00
oom_kill.c
mm: reduce noise in show_mem for lowmem allocations
2022-09-26 19:46:29 -07:00
page_alloc.c
mm/page_alloc: fix pcp->count race between drain_pages_zone() vs __rmqueue_pcplist()
2024-08-11 12:35:54 +02:00
page_counter.c
mm: page_counter: remove unneeded atomic ops for low/min
2022-09-11 20:26:01 -07:00
page_ext.c
mm/page_exit: fix kernel doc warning in page_ext_put()
2022-11-22 18:50:41 -08:00
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
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
page_isolation.c
mm/page_isolation: fix clang deadcode warning
2022-10-28 13:37:22 -07:00
page_owner.c
mm: reuse pageblock_start/end_pfn() macro
2022-10-03 14:03:03 -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_table_check.c
mm/page_table_check: fix crash on ZONE_DEVICE
2024-06-27 13:46:22 +02:00
page_vma_mapped.c
mm/swap: add swp_offset_pfn() to fetch PFN from swap entry
2022-09-26 19:46:05 -07:00
page-writeback.c
Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again"
2024-07-11 12:47:14 +02:00
pagewalk.c
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
percpu-internal.h
percpu: improve percpu_alloc_percpu event trace
2022-05-13 07:20:18 -07:00
percpu-km.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu-stats.c
mm: use vmalloc_array and vcalloc for array allocations
2022-03-08 09:30:46 -05:00
percpu-vm.c
percpu: flush tlb in pcpu_reclaim_populated()
2021-07-04 18:30:17 +00:00
percpu.c
mm: percpu: use kmemleak_ignore_phys() instead of kmemleak_free()
2022-07-17 17:14:47 -07:00
pgalloc-track.h
mm: fix typos in comments
2021-05-07 00:26:35 -07:00
pgtable-generic.c
mm: fix race between __split_huge_pmd_locked() and GUP-fast
2024-06-16 13:41:38 +02:00
process_vm_access.c
use less confusing names for iov_iter direction initializers
2023-02-09 11:28:04 +01:00
ptdump.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-03 10:13:13 -07:00
readahead.c
mm: use memalloc_nofs_save() in page_cache_ra_order()
2024-05-17 11:56:21 +02:00
rmap.c
mm/hwpoison: convert TTU_IGNORE_HWPOISON to TTU_HWPOISON
2023-03-10 09:34:25 +01:00
rodata_test.c
mm/rodata_test: use PAGE_ALIGNED() helper
2022-10-03 14:03:05 -07:00
secretmem.c
mm/secretmem: remove reduntant return value
2022-10-03 14:03:36 -07:00
shmem.c
mm/shmem: fix race in shmem_undo_range w/THP
2023-12-20 17:00:26 +01:00
shrinker_debug.c
mm: shrinkers: fix deadlock in shrinker debugfs
2023-02-22 12:59:46 +01:00
shuffle.c
mm/shuffle: convert module_param_call to module_param_cb
2022-10-03 14:03:07 -07:00
shuffle.h
mm/shuffle: fix section mismatch warning
2021-05-22 15:09:07 -10:00
slab_common.c
mm: Remove kmem_valid_obj()
2024-08-29 17:30:28 +02:00
slab.c
mm/slab: Fix undefined init_cache_node_node() for NUMA and !SMP
2023-03-30 12:49:23 +02:00
slab.h
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
slob.c
Merge branch 'slab/for-6.1/kmalloc_size_roundup' into slab/for-next
2022-09-29 11:30:55 +02:00
slub.c
treewide: use prandom_u32_max() when possible, part 1
2022-10-11 17:42:55 -06:00
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
x86/kaslr: Expose and use the end of the physical memory address space
2024-09-12 11:10:17 +02:00
swap_cgroup.c
mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled
2022-10-03 14:03:36 -07:00
swap_slots.c
mm/swap: convert put_swap_page() to put_swap_folio()
2022-10-03 14:02:46 -07:00
swap_state.c
swap_state: convert free_swap_cache() to use a folio
2022-10-03 14:02:51 -07:00
swap.c
mm: add folio_add_lru_vma()
2022-10-03 14:02:45 -07:00
swap.h
mm/swap: fix race when skipping swapcache
2024-03-01 13:26:32 +01:00
swapfile.c
mm: swap: fix race between free_swap_and_cache() and swapoff()
2024-04-03 15:19:32 +02:00
truncate.c
mm: Fix missing folio invalidation calls during truncation
2024-09-04 13:25:00 +02:00
usercopy.c
mm: Fix copy_from_user_nofault().
2023-06-28 11:12:17 +02:00
userfaultfd.c
userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb
2024-02-23 09:12:51 +01:00
util.c
mm: Remove kmem_valid_obj()
2024-08-29 17:30:28 +02:00
vmalloc.c
mm/vmalloc: fix page mapping if vm_area_alloc_pages() with high order fallback to order 0
2024-08-29 17:30:52 +02:00
vmpressure.c
net-memcg: Fix scope of sockmem pressure indicators
2023-09-13 09:42:33 +02:00
vmscan.c
mm/mglru: fix div-by-zero in vmpressure_calc_level()
2024-08-03 08:49:30 +02:00
vmstat.c
- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
2022-10-10 17:53:04 -07:00
workingset.c
mm/mglru: fix underprotected page cache
2023-12-20 17:00:26 +01:00
z3fold.c
mm: Convert all PageMovable users to movable_operations
2022-08-02 12:34:03 -04:00
zbud.c
mm/zbud: add kerneldoc fields for zbud_pool
2021-07-01 11:06:03 -07:00
zpool.c
zpool: remove the list of pools_head
2022-01-15 16:30:31 +02:00
zsmalloc.c
zsmalloc: allow only one active pool compaction context
2023-08-23 17:52:40 +02:00
zswap.c
mm: zswap: fix missing folio cleanup in writeback race path
2024-03-01 13:26:39 +01:00