diff options
| author | Suren Baghdasaryan <surenb@google.com> | 2022-07-31 12:38:54 -0700 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-07-11 21:20:25 -0400 |
| commit | 75b27971a7a0c014acd44f95db394f3ab381b92e (patch) | |
| tree | da3834b5edd957209654b3e2abafe8ce9aabe065 | |
| parent | 5e53214852eaeb1ef19e836676785da439b1eba2 (diff) | |
mm: prevent slabobj_ext allocations for slabobj_ext and kmem_cache objects
Use __GFP_NO_OBJ_EXT to prevent recursions when allocating slabobj_ext
objects. Also prevent slabobj_ext allocations for kmem_cache objects.
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
| -rw-r--r-- | mm/slab.h | 6 | ||||
| -rw-r--r-- | mm/slab_common.c | 2 |
2 files changed, 8 insertions, 0 deletions
diff --git a/mm/slab.h b/mm/slab.h index 3c1a0e4995ee..93ebe864366b 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -450,6 +450,12 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p) if (!need_slab_obj_ext()) return NULL; + if (s->flags & SLAB_NO_OBJ_EXT) + return NULL; + + if (flags & __GFP_NO_OBJ_EXT) + return NULL; + slab = virt_to_slab(p); if (!slab_obj_exts(slab) && WARN(alloc_slab_obj_exts(slab, s, flags, false), diff --git a/mm/slab_common.c b/mm/slab_common.c index 7bc237e4fcdb..ed918992616e 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -221,6 +221,8 @@ 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) |