On Thu, Apr 25, 2024 at 01:55:23PM -0700, Kees Cook wrote:
> The system will immediate fill up stack and crash when both
> CONFIG_DEBUG_KMEMLEAK and CONFIG_MEM_ALLOC_PROFILING are enabled.
> Avoid allocation tagging of kmemleak caches, otherwise recursive
> allocation tracking occurs.
>
> Fixes: 279bb991b4d9 ("mm/slab: add allocation accounting into slab allocation
> and free paths")
> Signed-off-by: Kees Cook <[email protected]>
> ---
> Cc: Suren Baghdasaryan <[email protected]>
> Cc: Kent Overstreet <[email protected]>
> Cc: Catalin Marinas <[email protected]>
> Cc: Andrew Morton <[email protected]>
> Cc: Christoph Lameter <[email protected]>
> Cc: Pekka Enberg <[email protected]>
> Cc: David Rientjes <[email protected]>
> Cc: Joonsoo Kim <[email protected]>
> Cc: Vlastimil Babka <[email protected]>
> Cc: Roman Gushchin <[email protected]>
> Cc: Hyeonggon Yoo <[email protected]>
> Cc: [email protected]
> ---
> mm/kmemleak.c | 4 ++--
> mm/slub.c | 2 +-
> 2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/kmemleak.c b/mm/kmemleak.c
> index c55c2cbb6837..fdcf01f62202 100644
> --- a/mm/kmemleak.c
> +++ b/mm/kmemleak.c
> @@ -463,7 +463,7 @@ static struct kmemleak_object *mem_pool_alloc(gfp_t gfp)
>
> /* try the slab allocator first */
> if (object_cache) {
> - object = kmem_cache_alloc(object_cache, gfp_kmemleak_mask(gfp));
> + object = kmem_cache_alloc_noprof(object_cache,
> gfp_kmemleak_mask(gfp));
What do these get accounted to, or does this now pop a warning with
CONFIG_MEM_ALLOC_PROFILING_DEBUG?
> if (object)
> return object;
> }
> @@ -947,7 +947,7 @@ static void add_scan_area(unsigned long ptr, size_t size,
> gfp_t gfp)
> untagged_objp = (unsigned long)kasan_reset_tag((void *)object->pointer);
>
> if (scan_area_cache)
> - area = kmem_cache_alloc(scan_area_cache,
> gfp_kmemleak_mask(gfp));
> + area = kmem_cache_alloc_noprof(scan_area_cache,
> gfp_kmemleak_mask(gfp));
>
> raw_spin_lock_irqsave(&object->lock, flags);
> if (!area) {
> diff --git a/mm/slub.c b/mm/slub.c
> index a94a0507e19c..9ae032ed17ed 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2016,7 +2016,7 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t
> flags, void *p)
> if (!p)
> return NULL;
>
> - if (s->flags & SLAB_NO_OBJ_EXT)
> + if (s->flags & (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE))
> return NULL;
>
> if (flags & __GFP_NO_OBJ_EXT)
> --
> 2.34.1
>
