Catalin Marinas c15cdea517 mm: slab: Do not create kmalloc caches smaller than arch_slab_minalign() ... Commit b035f5a6d8 ("mm: slab: reduce the kmalloc() minimum alignment if DMA bouncing possible") allows architectures with non-coherent DMA to define a small ARCH_KMALLOC_MINALIGN (e.g. sizeof(unsigned long long)) and this has been enabled on arm64. With KASAN_HW_TAGS enabled, however, ARCH_SLAB_MINALIGN becomes 16 on arm64 (arch_slab_minalign() dynamically selects it since commit d949a8155d ("mm: make minimum slab alignment a runtime property")). This can lead to a situation where kmalloc-8 caches are attempted to be created with a kmem_caches.size aligned to 16. When the cache is mergeable, it can lead to kernel warnings like: sysfs: cannot create duplicate filename '/kernel/slab/:d-0000016' CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc1-00001-gda98843cd306-dirty #5 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 Call trace: dump_backtrace+0x90/0xe8 show_stack+0x18/0x24 dump_stack_lvl+0x48/0x60 dump_stack+0x18/0x24 sysfs_warn_dup+0x64/0x80 sysfs_create_dir_ns+0xe8/0x108 kobject_add_internal+0x98/0x264 kobject_init_and_add+0x8c/0xd8 sysfs_slab_add+0x12c/0x248 slab_sysfs_init+0x98/0x14c do_one_initcall+0x6c/0x1b0 kernel_init_freeable+0x1c0/0x288 kernel_init+0x24/0x1e0 ret_from_fork+0x10/0x20 kobject: kobject_add_internal failed for :d-0000016 with -EEXIST, don't try to register things with the same name in the same directory. SLUB: Unable to add boot slab dma-kmalloc-8 to sysfs Limit the __kmalloc_minalign() return value (used to create the kmalloc-* caches) to arch_slab_minalign() so that kmalloc-8 caches are skipped when KASAN_HW_TAGS is enabled (both config and runtime). Reported-by: Mark Rutland <mark.rutland@arm.com> Fixes: b035f5a6d8 ("mm: slab: reduce the kmalloc() minimum alignment if DMA bouncing possible") Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Peter Collingbourne <pcc@google.com> Cc: stable@vger.kernel.org # 6.5.x Signed-off-by: Vlastimil Babka <vbabka@suse.cz>		2023-10-11 15:24:49 +02:00
..
damon	mm/damon/vaddr-test: fix memory leak in damon_do_test_apply_three_regions()	2023-09-29 17:20:47 -07:00
kasan	kasan: Cleanup the __HAVE_ARCH_SHADOW_MAP usage	2023-09-20 14:26:29 +08:00
kfence
kmsan
backing-dev.c
balloon_compaction.c
bootmem_info.c
cma.c
cma.h
cma_debug.c
cma_sysfs.c
compaction.c
debug.c
debug_page_alloc.c
debug_page_ref.c
debug_vm_pgtable.c
dmapool.c
dmapool_test.c
early_ioremap.c
fadvise.c
fail_page_alloc.c
failslab.c
filemap.c	mm: report success more often from filemap_map_folio_range()	2023-09-29 17:20:45 -07:00
folio-compat.c
gup.c
gup_test.c
gup_test.h
highmem.c
hmm.c
huge_memory.c
hugetlb.c	mm: hugetlb: add huge page size param to set_huge_pte_at()	2023-09-29 17:20:47 -07:00
hugetlb_cgroup.c
hugetlb_vmemmap.c
hugetlb_vmemmap.h
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
io-mapping.c
ioremap.c
Kconfig
Kconfig.debug
khugepaged.c
kmemleak.c
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile
mapping_dirty_helpers.c
memblock.c
memcontrol.c	mm, memcg: reconsider kmem.limit_in_bytes deprecation	2023-09-29 17:20:47 -07:00
memfd.c
memory-failure.c
memory-tiers.c
memory.c
memory_hotplug.c
mempolicy.c	mm: mempolicy: keep VMA walk if both MPOL_MF_STRICT and MPOL_MF_MOVE are specified	2023-09-29 17:20:48 -07:00
mempool.c
memremap.c
memtest.c
migrate.c	mm: hugetlb: add huge page size param to set_huge_pte_at()	2023-09-29 17:20:47 -07:00
migrate_device.c
mincore.c
mlock.c
mm_init.c
mm_slot.h
mmap.c
mmap_lock.c
mmu_gather.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c	vm: fix move_vma() memory accounting being off	2023-09-16 15:23:31 -07:00
msync.c
nommu.c
oom_kill.c
page-writeback.c
page_alloc.c	mm: page_alloc: fix CMA and HIGHATOMIC landing on the wrong buddy list	2023-09-19 13:21:32 -07:00
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c
page_owner.c
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c
page_vma_mapped.c
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c
pgalloc-track.h
pgtable-generic.c
process_vm_access.c
ptdump.c
readahead.c
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
shmem.c	Revert "tmpfs: add support for multigrain timestamps"	2023-09-20 18:05:30 +02:00
shmem_quota.c
show_mem.c
shrinker_debug.c
shuffle.c
shuffle.h
slab.c
slab.h
slab_common.c	mm: slab: Do not create kmalloc caches smaller than arch_slab_minalign()	2023-10-11 15:24:49 +02:00
slub.c
sparse-vmemmap.c
sparse.c
swap.c
swap.h
swap_cgroup.c
swap_slots.c
swap_state.c
swapfile.c
truncate.c
usercopy.c
userfaultfd.c
util.c
vmalloc.c	mm: hugetlb: add huge page size param to set_huge_pte_at()	2023-09-29 17:20:47 -07:00
vmpressure.c
vmscan.c
vmstat.c
workingset.c
z3fold.c
zbud.c
zpool.c
zsmalloc.c
zswap.c	mm: zswap: fix potential memory corruption on duplicate store	2023-09-29 17:20:47 -07:00