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List-Subscribe: List-Unsubscribe: On Wed, Jan 07, 2026 at 12:43:17PM +0100, Vlastimil Babka wrote: > On 1/5/26 09:02, Harry Yoo wrote: > > When both KASAN and SLAB_STORE_USER are enabled, accesses to > > struct kasan_alloc_meta fields can be misaligned on 64-bit architectures. > > This occurs because orig_size is currently defined as unsigned int, > > which only guarantees 4-byte alignment. When struct kasan_alloc_meta is > > placed after orig_size, it may end up at a 4-byte boundary rather than > > the required 8-byte boundary on 64-bit systems. > > Oops. > > > 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. > > > > Change orig_size from unsigned int to unsigned long to ensure proper > > alignment for any subsequent metadata. This should not waste additional > > memory because kmalloc objects are already aligned to at least > > ARCH_KMALLOC_MINALIGN. > > I'll add: > > Closes: https://lore.kernel.org/all/aPrLF0OUK651M4dk@hyeyoo/ > > since that's useful context and discussion. Looks good to me. > > Suggested-by: Andrey Ryabinin > > Cc: stable@vger.kernel.org > > Fixes: 6edf2576a6cc ("mm/slub: enable debugging memory wasting of kmalloc") > > Signed-off-by: Harry Yoo > > As the problem was introduced in 6.1, doesn't seem urgent to push as 6.19 rc > fix, so keeping it as part of the series Yeah, no need to hurry. > (where it's a necessary prerequisity per the Closes: link above) Technically it's not a necessary prerequisite anymore because the series doesn't unpoison slabobj_ext anymore, but later patches depend on it because of the change in object layout. > and stable backporting later seems indeed sufficient. Thanks. backporting later sounds reasonable. Thanks! -- Cheers, Harry / Hyeonggon