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Thu, 25 Apr 2024 13:55:25 -0700 (PDT) Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id cn19-20020a17090af09300b002a2b06ce909sm14996316pjb.17.2024.04.25.13.55.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Apr 2024 13:55:24 -0700 (PDT) From: Kees Cook To: Suren Baghdasaryan Cc: Kees Cook , Kent Overstreet , Catalin Marinas , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] mm/slub: Avoid recursive loop with kmemleak Date: Thu, 25 Apr 2024 13:55:23 -0700 Message-Id: <20240425205516.work.220-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2235; i=keescook@chromium.org; 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charset="utf-8" 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 allocati= on and free paths") Signed-off-by: Kees Cook Acked-by: Catalin Marinas --- Cc: Suren Baghdasaryan Cc: Kent Overstreet Cc: Catalin Marinas Cc: Andrew Morton Cc: Christoph Lameter Cc: Pekka Enberg Cc: David Rientjes Cc: Joonsoo Kim Cc: Vlastimil Babka Cc: Roman Gushchin 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) =20 /* try the slab allocator first */ if (object_cache) { - object =3D kmem_cache_alloc(object_cache, gfp_kmemleak_mask(gfp)); + object =3D kmem_cache_alloc_noprof(object_cache, gfp_kmemleak_mask(gfp)); if (object) return object; } @@ -947,7 +947,7 @@ static void add_scan_area(unsigned long ptr, size_t siz= e, gfp_t gfp) untagged_objp =3D (unsigned long)kasan_reset_tag((void *)object->pointer); =20 if (scan_area_cache) - area =3D kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp)); + area =3D kmem_cache_alloc_noprof(scan_area_cache, gfp_kmemleak_mask(gfp)= ); =20 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; =20 - if (s->flags & SLAB_NO_OBJ_EXT) + if (s->flags & (SLAB_NO_OBJ_EXT | SLAB_NOLEAKTRACE)) return NULL; =20 if (flags & __GFP_NO_OBJ_EXT) --=20 2.34.1