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bpf: add memlock precharge check for cgroup_local_storage 

Cgroup local storage maps lack the memlock precharge check,
which is performed before the memory allocation for
most other bpf map types.

Let's add it in order to unify all map types.

Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Roman Gushchin 2019-05-29 18:03:55 -07:00 committed by Alexei Starovoitov
parent 576240cfaf
commit ffc8b144d5
1 changed files with 9 additions and 2 deletions
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11
kernel/bpf/local_storage.c
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@ -272,6 +272,8 @@ static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
{
int numa_node = bpf_map_attr_numa_node(attr);
struct bpf_cgroup_storage_map *map;
u32 pages;
int ret;
if (attr->key_size != sizeof(struct bpf_cgroup_storage_key))
return ERR_PTR(-EINVAL);
@ -290,13 +292,18 @@ static struct bpf_map *cgroup_storage_map_alloc(union bpf_attr *attr)
/* max_entries is not used and enforced to be 0 */
return ERR_PTR(-EINVAL);
pages = round_up(sizeof(struct bpf_cgroup_storage_map), PAGE_SIZE) >>
PAGE_SHIFT;
ret = bpf_map_precharge_memlock(pages);
if (ret < 0)
return ERR_PTR(ret);
map = kmalloc_node(sizeof(struct bpf_cgroup_storage_map),
__GFP_ZERO | GFP_USER, numa_node);
if (!map)
return ERR_PTR(-ENOMEM);
map->map.pages = round_up(sizeof(struct bpf_cgroup_storage_map),
PAGE_SIZE) >> PAGE_SHIFT;
map->map.pages = pages;
/* copy mandatory map attributes */
bpf_map_init_from_attr(&map->map, attr);