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2025 at 09:00:28PM +0900, Harry Yoo wrote: > When the SLAB_STORE_USER debug flag is used, any metadata placed after > the original kmalloc request size (orig_size) is not properly aligned > on 64-bit architectures because its type is unsigned int. When both KASAN > and SLAB_STORE_USER are enabled, kasan_alloc_meta is misaligned. > > Note that 64-bit architectures without HAVE_EFFICIENT_UNALIGNED_ACCESS > are assumed to require 64-bit accesses to be 64-bit aligned. > See HAVE_64BIT_ALIGNED_ACCESS and commit adab66b71abf ("Revert: > "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS"") for more details. > > Because not all architectures support unaligned memory accesses, > ensure that all metadata (track, orig_size, kasan_{alloc,free}_meta) > in a slab object are word-aligned. struct track, kasan_{alloc,free}_meta > are aligned by adding __aligned(__alignof__(unsigned long)). > > For orig_size, use ALIGN(sizeof(unsigned int), sizeof(unsigned long)) to ^ Uh, here I intended to say: __aligneof__(unsigned long)) > make clear that its size remains unsigned int but it must be aligned to > a word boundary. On 64-bit architectures, this reserves 8 bytes for > orig_size, which is acceptable since kmalloc's original request size > tracking is intended for debugging rather than production use. > > Cc: stable@vger.kernel.org > Fixes: 6edf2576a6cc ("mm/slub: enable debugging memory wasting of kmalloc") > Acked-by: Andrey Konovalov > Signed-off-by: Harry Yoo > --- > > v1 -> v2: > - Added Andrey's Acked-by. > - Added references to HAVE_64BIT_ALIGNED_ACCESS and the commit that > resurrected it. > - Used __alignof__() instead of sizeof(), as suggested by Pedro (off-list). > Note: either __alignof__ or sizeof() produces the exactly same mm/slub.o > files, so there's no functional difference. > > Thanks! > > mm/kasan/kasan.h | 4 ++-- > mm/slub.c | 16 +++++++++++----- > 2 files changed, 13 insertions(+), 7 deletions(-) -- Cheers, Harry / Hyeonggon