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devmap: Use bpf_map_area_alloc() for allocating hash buckets 

[ Upstream commit 99c51064fb06146b3d494b745c947e438a10aaa7 ]

Syzkaller discovered that creating a hash of type devmap_hash with a large
number of entries can hit the memory allocator limit for allocating
contiguous memory regions. There's really no reason to use kmalloc_array()
directly in the devmap code, so just switch it to the existing
bpf_map_area_alloc() function that is used elsewhere.

Fixes: 6f9d451ab1 ("xdp: Add devmap_hash map type for looking up devices by hashed index")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20200616142829.114173-1-toke@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Toke Høiland-Jørgensen 2020-06-16 16:28:29 +02:00 committed by Sasha Levin
parent b93df0f6d7
commit 0f3aa6c6d6
1 changed files with 6 additions and 4 deletions
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10
kernel/bpf/devmap.c
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@ -88,12 +88,13 @@ struct bpf_dtab {
static DEFINE_SPINLOCK(dev_map_lock);
static LIST_HEAD(dev_map_list);
static struct hlist_head *dev_map_create_hash(unsigned int entries)
static struct hlist_head *dev_map_create_hash(unsigned int entries,
int numa_node)
{
int i;
struct hlist_head *hash;
hash = kmalloc_array(entries, sizeof(*hash), GFP_KERNEL);
hash = bpf_map_area_alloc(entries * sizeof(*hash), numa_node);
if (hash != NULL)
for (i = 0; i < entries; i++)
INIT_HLIST_HEAD(&hash[i]);
@ -151,7 +152,8 @@ static int dev_map_init_map(struct bpf_dtab *dtab, union bpf_attr *attr)
INIT_LIST_HEAD(per_cpu_ptr(dtab->flush_list, cpu));
if (attr->map_type == BPF_MAP_TYPE_DEVMAP_HASH) {
dtab->dev_index_head = dev_map_create_hash(dtab->n_buckets);
dtab->dev_index_head = dev_map_create_hash(dtab->n_buckets,
dtab->map.numa_node);
if (!dtab->dev_index_head)
goto free_percpu;
@ -249,7 +251,7 @@ static void dev_map_free(struct bpf_map *map)
}
}
kfree(dtab->dev_index_head);
bpf_map_area_free(dtab->dev_index_head);
} else {
for (i = 0; i < dtab->map.max_entries; i++) {
struct bpf_dtab_netdev *dev;