diff options
| author | Suren Baghdasaryan <surenb@google.com> | 2022-08-07 17:55:50 +0000 |
|---|---|---|
| committer | Suren Baghdasaryan <surenb@google.com> | 2024-03-05 15:59:00 +0000 |
| commit | 10a9e656d9ff3fa43ee0eb0f8173c042335a04d2 (patch) | |
| tree | 75593854124a91cde18c5e4625167e77d24a4e37 | |
| parent | 9451386d2cb8832d42a07099e2874606517fde1b (diff) | |
mm/slab: introduce SLAB_NO_OBJ_EXT to avoid obj_ext creation
Slab extension objects can't be allocated before slab infrastructure is
initialized. Some caches, like kmem_cache and kmem_cache_node, are created
before slab infrastructure is initialized. Objects from these caches can't
have extension objects. Introduce SLAB_NO_OBJ_EXT slab flag to mark these
caches and avoid creating extensions for objects allocated from these
slabs.
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
| -rw-r--r-- | include/linux/slab.h | 6 | ||||
| -rw-r--r-- | mm/slub.c | 5 |
2 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index b5f5ee8308d0..58794043ab5b 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -28,6 +28,12 @@ */ /* DEBUG: Perform (expensive) checks on alloc/free */ #define SLAB_CONSISTENCY_CHECKS ((slab_flags_t __force)0x00000100U) +/* Slab created using create_boot_cache */ +#ifdef CONFIG_SLAB_OBJ_EXT +#define SLAB_NO_OBJ_EXT ((slab_flags_t __force)0x00000200U) +#else +#define SLAB_NO_OBJ_EXT 0 +#endif /* DEBUG: Red zone objs in a cache */ #define SLAB_RED_ZONE ((slab_flags_t __force)0x00000400U) /* DEBUG: Poison objects */ diff --git a/mm/slub.c b/mm/slub.c index 2ba5d7b2711d..e94d3cc1b270 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -5704,7 +5704,8 @@ void __init kmem_cache_init(void) node_set(node, slab_nodes); create_boot_cache(kmem_cache_node, "kmem_cache_node", - sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN, 0, 0); + sizeof(struct kmem_cache_node), + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); @@ -5714,7 +5715,7 @@ void __init kmem_cache_init(void) create_boot_cache(kmem_cache, "kmem_cache", offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *), - SLAB_HWCACHE_ALIGN, 0, 0); + SLAB_HWCACHE_ALIGN | SLAB_NO_OBJ_EXT, 0, 0); kmem_cache = bootstrap(&boot_kmem_cache); kmem_cache_node = bootstrap(&boot_kmem_cache_node); |