From 768c33be1b3166791bd554abd105154719eba43d Mon Sep 17 00:00:00 2001 From: Suren Baghdasaryan Date: Thu, 21 Mar 2024 09:36:29 -0700 Subject: mm: introduce __GFP_NO_OBJ_EXT flag to selectively prevent slabobj_ext creation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Introduce __GFP_NO_OBJ_EXT flag in order to prevent recursive allocations when allocating slabobj_ext on a slab. Link: https://lkml.kernel.org/r/20240321163705.3067592-8-surenb@google.com Signed-off-by: Suren Baghdasaryan Reviewed-by: Kees Cook Reviewed-by: Pasha Tatashin Reviewed-by: Vlastimil Babka Tested-by: Kees Cook Cc: Alexander Viro Cc: Alex Gaynor Cc: Alice Ryhl Cc: Andreas Hindborg Cc: Benno Lossin Cc: "Björn Roy Baron" Cc: Boqun Feng Cc: Christoph Lameter Cc: Dennis Zhou Cc: Gary Guo Cc: Kent Overstreet Cc: Miguel Ojeda Cc: Peter Zijlstra Cc: Tejun Heo Cc: Wedson Almeida Filho Signed-off-by: Andrew Morton --- mm/slub.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'mm') diff --git a/mm/slub.c b/mm/slub.c index 5c896c76812d..2cb53642a091 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1889,6 +1889,8 @@ static int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, void *vec; gfp &= ~OBJCGS_CLEAR_MASK; + /* Prevent recursive extension vector allocation */ + gfp |= __GFP_NO_OBJ_EXT; vec = kcalloc_node(objects, sizeof(struct slabobj_ext), gfp, slab_nid(slab)); if (!vec) -- cgit