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    SubjectRe: [PATCH] mm/slub: Avoid recursive loop with kmemleak
    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 <keescook@chromium.org>
    > ---
    > Cc: Suren Baghdasaryan <surenb@google.com>
    > Cc: Kent Overstreet <kent.overstreet@linux.dev>
    > Cc: Catalin Marinas <catalin.marinas@arm.com>
    > Cc: Andrew Morton <akpm@linux-foundation.org>
    > Cc: Christoph Lameter <cl@linux.com>
    > Cc: Pekka Enberg <penberg@kernel.org>
    > Cc: David Rientjes <rientjes@google.com>
    > Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    > Cc: Vlastimil Babka <vbabka@suse.cz>
    > Cc: Roman Gushchin <roman.gushchin@linux.dev>
    > Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
    > Cc: linux-mm@kvack.org
    > ---
    > 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
    >

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