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Alexander Potapenko d155aab90f mm/kfence: fix KASAN hardware tag faults during late enablement 
When KASAN hardware tags are enabled, re-enabling KFENCE late (via
/sys/module/kfence/parameters/sample_interval) causes KASAN faults.

This happens because the KFENCE pool and metadata are allocated via the
page allocator, which tags the memory, while KFENCE continues to access it
using untagged pointers during initialization.

Use __GFP_SKIP_KASAN for late KFENCE pool and metadata allocations to
ensure the memory remains untagged, consistent with early allocations from
memblock.  To support this, add __GFP_SKIP_KASAN to the allowlist in
__alloc_contig_verify_gfp_mask().

Link: https://lkml.kernel.org/r/20260220144940.2779209-1-glider@google.com
Fixes: 0ce20dd840 ("mm: add Kernel Electric-Fence infrastructure")
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Ernesto Martinez Garcia <ernesto.martinezgarcia@tugraz.at>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-02-24 11:13:27 -08:00
..
damon mm/damon/core: disallow non-power of two min_region_sz 2026-02-24 11:13:27 -08:00
kasan Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
kfence mm/kfence: fix KASAN hardware tag faults during late enablement 2026-02-24 11:13:27 -08:00
kmsan Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tests sparc/mm: export symbols for lazy_mmu_mode KUnit tests 2026-01-31 14:22:40 -08:00
backing-dev.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
balloon.c mm: rename CONFIG_BALLOON_COMPACTION to CONFIG_BALLOON_MIGRATION 2026-01-31 14:22:36 -08:00
bootmem_info.c mm/sparse: allow for alternate vmemmap section init at boot 2025-03-16 22:06:27 -07:00
bpf_memcontrol.c bpf: Revert "bpf: drop KF_ACQUIRE flag on BPF kfunc bpf_get_root_mem_cgroup()" 2026-01-21 09:38:16 -08:00
cma.c mm/cma: replace snprintf with strscpy in cma_new_area 2026-02-06 15:47:15 -08:00
cma.h mm: cma: set early_pfn and bitmap as a union in cma_memrange 2025-05-22 14:55:36 -07:00
cma_debug.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cma_sysfs.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
compaction.c mm/compaction: fix low_pfn advance on isolating hugetlb 2025-09-28 11:51:29 -07:00
debug.c mm: constify __dump_folio() arguments 2025-11-20 13:43:57 -08:00
debug_page_alloc.c mm/debug_page_alloc: improve error message for invalid guardpage minorder 2025-05-12 23:50:38 -07:00
debug_page_ref.c
debug_vm_pgtable.c mm: debug_vm_pgtable: add debug_vm_pgtable_free_huge_page() 2026-01-26 20:02:27 -08:00
dmapool.c docs: dma-api: replace consistent with coherent 2025-07-01 13:25:36 -06:00
dmapool_test.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
early_ioremap.c mm/early_ioremap: clean up the use of WARN() for debugging 2026-01-26 20:02:26 -08:00
execmem.c mm: remove PMD alignment constraint in execmem_vmalloc() 2025-09-28 11:51:31 -07:00
fadvise.c mm: rename filemap_fdatawrite_range_kick to filemap_flush_range 2025-10-29 15:50:42 +01:00
fail_page_alloc.c
failslab.c
filemap.c mm: make vm_area_desc utilise vma_flags_t only 2026-02-12 15:42:59 -08:00
folio-compat.c mm: add SPDX id lines to some mm source files 2026-02-06 15:47:16 -08:00
gup.c mm/gup: remove no longer used gup_fast_undo_dev_pagemap 2026-01-20 19:24:49 -08:00
gup_test.c mm: add SPDX id lines to some mm source files 2026-02-06 15:47:16 -08:00
gup_test.h
highmem.c mm/highmem: fix __kmap_to_page() build error 2026-01-31 14:22:38 -08:00
hmm.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
huge_memory.c mm: thp: deny THP for files on anonymous inodes 2026-02-24 11:13:26 -08:00
hugetlb.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hugetlb_cgroup.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hugetlb_cma.c mm: hugetlb_cma: mark hugetlb_cma{_only} as __ro_after_init 2026-01-31 14:22:43 -08:00
hugetlb_cma.h mm: hugetlb: allocate frozen pages for gigantic allocation 2026-01-26 20:02:28 -08:00
hugetlb_internal.h mm/hugetlb: extract sysctl into hugetlb_sysctl.c 2025-11-20 13:43:57 -08:00
hugetlb_sysctl.c mm, hugetlb: implement movable_gigantic_pages sysctl 2026-01-20 19:24:50 -08:00
hugetlb_sysfs.c mm/hugetlb: extract sysfs into hugetlb_sysfs.c 2025-11-20 13:43:57 -08:00
hugetlb_vmemmap.c Revert "mm/hugetlb: deal with multiple calls to hugetlb_bootmem_alloc" 2026-01-26 20:02:20 -08:00
hugetlb_vmemmap.h mm/hugetlb: do pre-HVO for bootmem allocated pages 2025-03-16 22:06:29 -07:00
hwpoison-inject.c mm/hwpoison: decouple hwpoison_filter from mm/memory-failure.c 2025-09-21 14:22:21 -07:00
init-mm.c mm: rename cpu_bitmap field to flexible_array 2026-01-19 12:30:00 -08:00
internal.h mm.git review status for linus..mm-stable 2026-02-18 20:50:32 -08:00
interval_tree.c
ioremap.c mm/ioremap: pass pgprot_t to ioremap_prot() instead of unsigned long 2025-03-16 22:06:23 -07:00
Kconfig mm.git review status for linus..mm-stable 2026-02-12 11:32:37 -08:00
Kconfig.debug mm: fix DEBUG_RODATA_TEST indentation in Kconfig 2025-11-29 10:41:09 -08:00
khugepaged.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
kmemleak.c slab updates for 7.0 part2 2026-02-16 13:41:38 -08:00
ksm.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
list_lru.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
maccess.c mm: unexport globally copy_to_kernel_nofault 2025-07-09 22:42:22 -07:00
madvise.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
Makefile mm.git review status for linus..mm-nonmm-stable 2026-02-12 12:13:01 -08:00
mapping_dirty_helpers.c mm/dirty: replace READ_ONCE() with pudp_get() 2025-11-16 17:27:58 -08:00
memblock.c memblock: updates for 7.0-rc1 2026-02-14 12:39:34 -08:00
memcontrol-v1.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
memcontrol-v1.h mm.git review status for linus..mm-stable 2026-02-12 11:32:37 -08:00
memcontrol.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
memfd.c mm: update shmem_[kernel]_file_*() functions to use vma_flags_t 2026-02-12 15:42:58 -08:00
memfd_luo.c liveupdate: luo_file: remember retrieve() status 2026-02-24 11:13:26 -08:00
memory-failure.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
memory-tiers.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
memory.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
memory_hotplug.c mm: rename CONFIG_BALLOON_COMPACTION to CONFIG_BALLOON_MIGRATION 2026-01-31 14:22:36 -08:00
mempolicy.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
mempool.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
memremap.c mm/zone_device: reinitialize large zone device private folios 2026-01-26 19:03:48 -08:00
memtest.c mm/memtest: add underflow detection for size calculation 2026-01-09 11:53:51 +02:00
migrate.c mm: rename CONFIG_BALLOON_COMPACTION to CONFIG_BALLOON_MIGRATION 2026-01-31 14:22:36 -08:00
migrate_device.c mm: fix minor spelling mistakes in comments 2026-01-20 19:24:48 -08:00
mincore.c mm: replace remaining pte_to_swp_entry() with softleaf_from_pte() 2025-11-24 15:08:52 -08:00
mlock.c mm: update vma_modify_flags() to handle residual flags, document 2025-11-20 13:43:58 -08:00
mm_init.c memblock: updates for 7.0-rc1 2026-02-14 12:39:34 -08:00
mm_slot.h
mmap.c mm: update secretmem to use VMA flags on mmap_prepare 2026-02-12 15:42:58 -08:00
mmap_lock.c mm/vma: improve and document __is_vma_write_locked() 2026-01-31 14:22:51 -08:00
mmu_gather.c mm: add SPDX id lines to some mm source files 2026-02-06 15:47:16 -08:00
mmu_notifier.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
mmzone.c mm: introduce memdesc_flags_t 2025-09-13 16:55:07 -07:00
mprotect.c mm: introduce generic lazy_mmu helpers 2026-01-20 19:24:33 -08:00
mremap.c mm: update secretmem to use VMA flags on mmap_prepare 2026-02-12 15:42:58 -08:00
mseal.c mm: fix minor spelling mistakes in comments 2026-01-20 19:24:48 -08:00
msync.c
nommu.c mm/nommu: convert kobjsize() to folios 2025-09-13 16:54:46 -07:00
numa.c mm/numa: remove unnecessary local variable in alloc_node_data() 2025-05-12 23:50:38 -07:00
numa_emulation.c mm: numa,memblock: Use SZ_1M macro to denote bytes to MB conversion 2025-08-20 16:31:23 +03:00
numa_memblks.c memblock: numa_memblks: fix detection of NUMA node for CXL windows 2026-02-21 09:58:22 -08:00
oom_kill.c mm: fix OOM killer inaccuracy on large many-core systems 2026-01-31 14:22:37 -08:00
page-writeback.c mm/block/fs: remove laptop_mode 2026-01-20 19:24:47 -08:00
page_alloc.c mm/kfence: fix KASAN hardware tag faults during late enablement 2026-02-24 11:13:27 -08:00
page_counter.c page_counter: track failcnt only for legacy cgroups 2025-03-17 00:05:35 -07:00
page_ext.c mm/page_ext: Add page_ext_get_from_phys() 2026-01-21 12:51:48 +01:00
page_frag_cache.c mm/page_alloc: export free_frozen_pages() instead of free_unref_page() 2025-01-13 22:40:31 -08:00
page_idle.c mm/rmap: extend rmap and migration support device-private entries 2025-11-24 15:08:48 -08:00
page_io.c mm: fix minor spelling mistakes in comments 2026-01-20 19:24:48 -08:00
page_isolation.c mm: page_isolation: introduce page_is_unmovable() 2026-01-31 14:22:42 -08:00
page_owner.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
page_poison.c
page_reporting.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
page_reporting.h
page_table_check.c mm: provide address parameter to p{te,md,ud}_user_accessible_page() 2026-01-26 20:02:35 -08:00
page_vma_mapped.c mm: eliminate further swapops predicates 2025-11-24 15:08:52 -08:00
pagewalk.c mm/pagewalk: use min() to simplify the code 2026-01-31 14:22:52 -08:00
percpu-internal.h
percpu-km.c mm/mm/percpu-km: drop nth_page() usage within single allocation 2025-09-21 14:22:04 -07:00
percpu-stats.c mm: remove outdated filename comment in percpu-stats.c 2025-07-13 16:38:23 -07:00
percpu-vm.c kmsan: remove hard-coded GFP_KERNEL flags 2025-11-16 17:27:54 -08:00
percpu.c percpu: add double free check to pcpu_free_area() 2026-01-31 14:22:52 -08:00
pgalloc-track.h
pgtable-generic.c compiler-context-analysis: Remove __cond_lock() function-like helper 2026-01-05 16:43:33 +01:00
process_vm_access.c mm: refactor mm_access() to not return NULL 2024-11-05 16:56:23 -08:00
ptdump.c mm/ptdump: replace READ_ONCE() with standard page table accessors 2025-11-16 17:27:52 -08:00
readahead.c mm.git review status for linus..mm-stable 2026-02-12 11:32:37 -08:00
rmap.c mm: rmap: support batched unmapping for file large folios 2026-02-12 15:43:01 -08:00
rodata_test.c mm/rodata_test: verify test data is unchanged, rather than non-zero 2025-01-13 22:40:38 -08:00
secretmem.c mm: update secretmem to use VMA flags on mmap_prepare 2026-02-12 15:42:58 -08:00
shmem.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
shmem_quota.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
show_mem.c mm/vmscan: add tracepoint and reason for kswapd_failures reset 2026-01-31 14:22:38 -08:00
shrinker.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
shrinker_debug.c memcg: rename mem_cgroup_ino() to mem_cgroup_id() 2026-01-26 20:02:25 -08:00
shuffle.c
shuffle.h
slab.h Merge branch 'slab/for-7.0/sheaves' into slab/for-next 2026-02-10 09:10:00 +01:00
slab_common.c Merge branch 'slab/for-7.0/sheaves' into slab/for-next 2026-02-10 09:10:00 +01:00
slub.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sparse-vmemmap.c mm: replace READ_ONCE() with standard page table accessors 2025-11-16 17:27:56 -08:00
sparse.c mm/memory_hotplug: Remove MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers 2025-10-14 14:24:53 +02:00
swap.c mm: fix minor spelling mistakes in comments 2026-01-20 19:24:48 -08:00
swap.h mm, swap: drop the SWAP_HAS_CACHE flag 2026-01-31 14:22:57 -08:00
swap_cgroup.c mm: swap_cgroup: remove double initialization of locals 2025-03-17 22:06:58 -07:00
swap_state.c mm, swap: drop the SWAP_HAS_CACHE flag 2026-01-31 14:22:57 -08:00
swap_table.h mm, swap: use a single page for swap table when the size fits 2025-09-21 14:22:25 -07:00
swapfile.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
truncate.c vfs-6.19-rc1.folio 2025-12-01 10:26:38 -08:00
usercopy.c usercopy: Remove folio references from check_heap_object() 2025-11-13 11:01:08 +01:00
userfaultfd.c mm, swap: check swap table directly for checking cache 2026-01-31 14:22:57 -08:00
util.c mm: make vm_area_desc utilise vma_flags_t only 2026-02-12 15:42:59 -08:00
vma.c mm: make vm_area_desc utilise vma_flags_t only 2026-02-12 15:42:59 -08:00
vma.h mm: make vm_area_desc utilise vma_flags_t only 2026-02-12 15:42:59 -08:00
vma_exec.c mm: softdirty: add pgtable_supports_soft_dirty() 2025-11-24 15:08:54 -08:00
vma_init.c Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
vma_internal.h mm: relocate the page table ceiling and floor definitions 2026-02-12 15:42:53 -08:00
vmalloc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vmpressure.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vmscan.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
vmstat.c mm.git review status for linus..mm-stable 2026-02-12 11:32:37 -08:00
workingset.c memcg: introduce private id API for in-kernel users 2026-01-26 20:02:23 -08:00
zpdesc.h mm: zpdesc: minor naming and comment corrections 2025-09-21 14:21:59 -07:00
zsmalloc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
zswap.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00