On Wed, Jul 24, 2024 at 11:17 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Wed, 24 Jul 2024 18:34:12 +0200 Jann Horn <jannh@xxxxxxxxxx> wrote: > > > Currently, when KASAN is combined with init-on-free behavior, the > > initialization happens before KASAN's "invalid free" checks. > > > > More importantly, a subsequent commit will want to use the object metadata > > region to store an rcu_head, and we should let KASAN check that the object > > pointer is valid before that. (Otherwise that change will make the existing > > testcase kmem_cache_invalid_free fail.) > > > > So add a new KASAN hook that allows KASAN to pre-validate a > > kmem_cache_free() operation before SLUB actually starts modifying the > > object or its metadata. > > I added this, to fix the CONFIG_KASAN=n build Whoops, thanks for fixing that up.
