Peter Xu 6419341b6b mm/debug_vm_pgtable: drop RANDOM_ORVALUE trick ... commit 0b1ef4fde7 upstream. Macro RANDOM_ORVALUE was used to make sure the pgtable entry will be populated with !none data in clear tests. The RANDOM_ORVALUE tried to cover mostly all the bits in a pgtable entry, even if there's no discussion on whether all the bits will be vaild. Both S390 and PPC64 have their own masks to avoid touching some bits. Now it's the turn for x86_64. The issue is there's a recent report from Mikhail Gavrilov showing that this can cause a warning with the newly added pte set check in commit 8430557fc5 on writable v.s. userfaultfd-wp bit, even though the check itself was valid, the random pte is not. We can choose to mask more bits out. However the need to have such random bits setup is questionable, as now it's already guaranteed to be true on below: - For pte level, the pgtable entry will be installed with value from pfn_pte(), where pfn points to a valid page. Hence the pte will be !none already if populated with pfn_pte(). - For upper-than-pte level, the pgtable entry should contain a directory entry always, which is also !none. All the cases look like good enough to test a pxx_clear() helper. Instead of extending the bitmask, drop the "set random bits" trick completely. Add some warning guards to make sure the entries will be !none before clear(). Link: https://lkml.kernel.org/r/20240523132139.289719-1-peterx@redhat.com Fixes: 8430557fc5 ("mm/page_table_check: support userfault wr-protect entries") Signed-off-by: Peter Xu <peterx@redhat.com> Reported-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com> Link: https://lore.kernel.org/r/CABXGCsMB9A8-X+Np_Q+fWLURYL_0t3Y-MdoNabDM-Lzk58-DGA@mail.gmail.com Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com> Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Gavin Shan <gshan@redhat.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-08-19 06:04:31 +02:00
..
damon	mm/damon/core: merge regions aggressively when max_nr_regions is unmet	2024-07-18 13:21:24 +02:00
kasan	kasan/test: avoid gcc warning for intentional overflow	2024-04-03 15:28:20 +02:00
kfence	LoongArch changes for v6.6	2023-09-08 12:16:52 -07:00
kmsan	kmsan: do not wipe out origin when doing partial unpoisoning	2024-06-16 13:47:41 +02:00
backing-dev.c	blk-wbt: Fix detection of dirty-throttled tasks	2024-02-23 09:25:16 +01:00
balloon_compaction.c
bootmem_info.c
cma_debug.c
cma_sysfs.c	mm: cma: make kobj_type structure constant	2023-03-28 16:20:06 -07:00
cma.c	mm/cma: drop incorrect alignment check in cma_init_reserved_mem	2024-06-16 13:47:42 +02:00
cma.h
compaction.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
debug_page_alloc.c	mm: page_alloc: split out DEBUG_PAGEALLOC	2023-06-09 16:25:23 -07:00
debug_page_ref.c
debug_vm_pgtable.c	mm/debug_vm_pgtable: drop RANDOM_ORVALUE trick	2024-08-19 06:04:31 +02:00
debug.c	mm: update validate_mm() to use vma iterator	2023-06-09 16:25:31 -07:00
dmapool_test.c	dmapool: add alloc/free performance test	2023-04-05 19:42:38 -07:00
dmapool.c	dmapool: create/destroy cleanup	2023-06-09 16:25:17 -07:00
early_ioremap.c	mm/early_ioremap.c: improve the execution efficiency of early_ioremap_setup()	2023-06-09 16:25:56 -07:00
fadvise.c	mm: remove unnecessary pagevec includes	2023-06-23 16:59:31 -07:00
fail_page_alloc.c	mm: page_alloc: split out FAIL_PAGE_ALLOC	2023-06-09 16:25:23 -07:00
failslab.c
filemap.c	mm: page_ref: remove folio_try_get_rcu()	2024-07-25 09:50:56 +02:00
folio-compat.c	filemap: Add fgf_t typedef	2023-07-24 18:04:30 -04:00
gup_test.c	Merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes.	2023-06-23 16:58:19 -07:00
gup_test.h
gup.c	mm: gup: stop abusing try_grab_folio	2024-08-19 06:04:24 +02:00
highmem.c	mm: ptep_get() conversion	2023-06-19 16:19:25 -07:00
hmm.c	mm: enable page walking API to lock vmas during the walk	2023-08-21 13:07:20 -07:00
huge_memory.c	mm: gup: stop abusing try_grab_folio	2024-08-19 06:04:24 +02:00
hugetlb_cgroup.c	mm/hugetlb: increase use of folios in alloc_huge_page()	2023-02-13 15:54:27 -08:00
hugetlb_vmemmap.c	mm: hugetlb_vmemmap: fix a race between vmemmap pmd split	2023-08-18 10:12:14 -07:00
hugetlb_vmemmap.h
hugetlb.c	mm: gup: stop abusing try_grab_folio	2024-08-19 06:04:24 +02:00
hwpoison-inject.c
init-mm.c	mm: move dummy_vm_ops out of a header	2023-08-21 13:37:46 -07:00
internal.h	mm: gup: stop abusing try_grab_folio	2024-08-19 06:04:24 +02:00
interval_tree.c
io-mapping.c
ioremap.c	mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed	2023-08-18 10:12:36 -07:00
Kconfig	mm: restrict the pcp batch scale factor to avoid too long latency	2024-08-11 12:47:16 +02:00
Kconfig.debug	mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM	2023-05-29 16:14:28 +01:00
khugepaged.c	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -07:00
kmemleak.c	mm/kmemleak: move up cond_resched() call in page scanning loop	2023-09-02 15:17:34 -07:00
ksm.c	mm/ksm: fix ksm_zero_pages accounting	2024-06-16 13:47:41 +02:00
list_lru.c
maccess.c	mm: Fix copy_from_user_nofault().	2023-04-12 17:36:23 -07:00
madvise.c	mm/madvise: make MADV_POPULATE_(READ|WRITE) handle VM_FAULT_RETRY properly	2024-05-02 16:32:40 +02:00
Makefile	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -07:00
mapping_dirty_helpers.c	mm: fix clean_record_shared_mapping_range kernel-doc	2023-08-24 16:20:30 -07:00
memblock.c	x86/numa: Fix the address overlap check in numa_fill_memblks()	2024-03-01 13:35:06 +01:00
memcontrol.c	memcg: protect concurrent access to mem_cgroup_idr	2024-08-14 13:58:57 +02:00
memfd.c	revert "memfd: improve userspace warnings for missing exec-related flags".	2023-09-05 11:11:52 -07:00
memory_hotplug.c	mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval	2024-01-20 11:51:49 +01:00
memory-failure.c	mm/huge_memory: don't unpoison huge_zero_folio	2024-06-21 14:38:46 +02:00
memory-tiers.c	memory tier: use helper macro __ATTR_RW()	2023-08-18 10:12:38 -07:00
memory.c	mm: fix old/young bit handling in the faulting path	2024-08-03 08:54:24 +02:00
mempolicy.c	mm/numa_balancing: teach mpol_to_str about the balancing mode	2024-08-03 08:54:25 +02:00
mempool.c
memremap.c	mm/memremap.c: fix outdated comment in devm_memremap_pages	2023-02-09 16:51:46 -08:00
memtest.c	memtest: use {READ,WRITE}_ONCE in memory scanning	2024-04-03 15:28:33 +02:00
migrate_device.c	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
migrate.c	mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index	2024-03-15 10:48:14 -04:00
mincore.c	mm: enable page walking API to lock vmas during the walk	2023-08-21 13:07:20 -07:00
mlock.c	merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes	2023-08-21 14:26:20 -07:00
mm_init.c	efi: disable mirror feature during crashkernel	2024-01-31 16:18:56 -08:00
mm_slot.h
mmap_lock.c	mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer	2024-08-03 08:54:12 +02:00
mmap.c	mm, mmap: fix vma_merge() case 7 with vma_ops->close	2024-04-03 15:28:40 +02:00
mmu_gather.c	mm: fix kernel-doc warning from tlb_flush_rmaps()	2023-08-24 16:20:30 -07:00
mmu_notifier.c	mmu_notifiers: rename invalidate_range notifier	2023-08-18 10:12:41 -07:00
mmzone.c
mprotect.c	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
mremap.c	vm: fix move_vma() memory accounting being off	2023-09-16 15:23:31 -07:00
msync.c
nommu.c	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
oom_kill.c	mm: remove redundant K() macro definition	2023-08-21 13:37:44 -07:00
page_alloc.c	mm/page_alloc: fix pcp->count race between drain_pages_zone() vs __rmqueue_pcplist()	2024-08-11 12:47:16 +02:00
page_counter.c
page_ext.c	mm/page_ext: move functions around for minor cleanups to page_ext	2023-08-18 10:12:31 -07:00
page_idle.c	mm: page_idle: convert page idle to use a folio	2023-01-18 17:12:52 -08:00
page_io.c	zswap: make zswap_load() take a folio	2023-08-21 13:37:27 -07:00
page_isolation.c	mm/hugetlb: get rid of page_hstate()	2023-08-18 10:12:39 -07:00
page_owner.c	mm/page_ext: use page_ext_data helper in page_owner	2023-08-21 13:37:27 -07:00
page_poison.c	mm/page_poison: remove unused page_ext.h from page_poison	2023-08-21 13:37:30 -07:00
page_reporting.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
page_reporting.h
page_table_check.c	mm/page_table_check: support userfault wr-protect entries	2024-08-19 06:04:29 +02:00
page_vma_mapped.c	mm: correct stale comment of function check_pte	2023-08-18 10:12:13 -07:00
page-writeback.c	Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again"	2024-07-11 12:49:16 +02:00
pagewalk.c	mm/pagewalk: fix bootstopping regression from extra pte_unmap()	2023-09-02 08:39:21 -07:00
percpu-internal.h	percpu-internal/pcpu_chunk: re-layout pcpu_chunk structure to reduce false sharing	2023-06-19 16:19:29 -07:00
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c	mm: Introduce flush_cache_vmap_early()	2024-02-16 19:10:52 +01:00
pgalloc-track.h
pgtable-generic.c	mm: fix race between __split_huge_pmd_locked() and GUP-fast	2024-06-16 13:47:40 +02:00
process_vm_access.c	mm/gup: remove unused vmas parameter from pin_user_pages_remote()	2023-06-09 16:25:25 -07:00
ptdump.c	mm: ptdump should use ptep_get_lockless()	2023-06-19 16:19:24 -07:00
readahead.c	mm: use memalloc_nofs_save() in page_cache_ra_order()	2024-05-17 12:02:36 +02:00
rmap.c	mm: hugetlb: add huge page size param to set_huge_pte_at()	2023-09-29 17:20:47 -07:00
rodata_test.c
secretmem.c	mm/secretmem: use a folio in secretmem_fault()	2023-08-21 13:38:02 -07:00
shmem_quota.c	tmpfs: fix race on handling dquot rbtree	2024-04-03 15:28:54 +02:00
shmem.c	mm/shmem: disable PMD-sized page cache if needed	2024-07-18 13:21:24 +02:00
show_mem.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
shrinker_debug.c	Revert "mm: shrinkers: make count and scan in shrinker debugfs lockless"	2023-06-19 13:19:34 -07:00
shuffle.c
shuffle.h	mm, treewide: redefine MAX_ORDER sanely	2023-04-05 19:42:46 -07:00
slab_common.c	mm: slab: Do not create kmalloc caches smaller than arch_slab_minalign()	2023-10-11 15:24:49 +02:00
slab.c	Randomized slab caches for kmalloc()	2023-07-18 10:07:47 +02:00
slab.h	Randomized slab caches for kmalloc()	2023-07-18 10:07:47 +02:00
slub.c	mm/slub: remove freelist_dereference()	2023-07-14 09:57:21 +02:00
sparse-vmemmap.c	mm/vmemmap: allow architectures to override how vmemmap optimization works	2023-08-18 10:12:53 -07:00
sparse.c	mm/sparsemem: fix race in accessing memory_section->usage	2024-01-31 16:18:56 -08:00
swap_cgroup.c
swap_slots.c
swap_state.c	mm/swap: inline folio_set_swap_entry() and folio_swap_entry()	2023-08-24 16:20:28 -07:00
swap.c	mm: remove references to pagevec	2023-06-23 16:59:30 -07:00
swap.h	mm/swap: fix race when skipping swapcache	2024-03-01 13:35:00 +01:00
swapfile.c	mm: swap: fix race between free_swap_and_cache() and swapoff()	2024-04-03 15:28:27 +02:00
truncate.c	- Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list")	2023-08-29 14:25:26 -07:00
usercopy.c	mm: Fix copy_from_user_nofault().	2023-04-12 17:36:23 -07:00
userfaultfd.c	mm/userfaultfd: Do not place zeropages when zeropages are disallowed	2024-06-12 11:11:33 +02:00
util.c	parisc: fix mmap_base calculation when stack grows upwards	2023-11-28 17:20:08 +00:00
vmalloc.c	mm: vmalloc: check if a hash-index is in cpu_possible_mask	2024-07-18 13:21:20 +02:00
vmpressure.c	net-memcg: Fix scope of sockmem pressure indicators	2023-08-16 12:21:32 +01:00
vmscan.c	mm/mglru: fix ineffective protection calculation	2024-08-03 08:54:33 +02:00
vmstat.c	mm, treewide: introduce NR_PAGE_ORDERS	2024-05-02 16:32:41 +02:00
workingset.c	mm: ratelimit stat flush from workingset shrinker	2024-06-16 13:47:31 +02:00
z3fold.c	mm/z3fold: remove obsolete comment for struct z3fold_pool	2023-08-21 13:37:51 -07:00
zbud.c	mm: zswap: remove shrink from zpool interface	2023-06-19 16:19:27 -07:00
zpool.c	mm: zswap: remove shrink from zpool interface	2023-06-19 16:19:27 -07:00
zsmalloc.c	merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes	2023-08-21 14:26:20 -07:00
zswap.c	mm: zswap: fix missing folio cleanup in writeback race path	2024-03-01 13:35:10 +01:00