bpf: check for reserved flag bits in array and stack maps

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index bd3bdf2..76d5a79 100644 (file)
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -53,7 +53,7 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
 
        /* check sanity of attributes */
        if (attr->max_entries == 0 || attr->key_size != 4 ||
-           attr->value_size == 0)
+           attr->value_size == 0 || attr->map_flags)
                return ERR_PTR(-EINVAL);
 
        if (attr->value_size >= 1 << (KMALLOC_SHIFT_MAX - 1))

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 8a60ee1..f0a02c3 100644 (file)
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -35,6 +35,9 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
        if (!capable(CAP_SYS_ADMIN))
                return ERR_PTR(-EPERM);
 
+       if (attr->map_flags)
+               return ERR_PTR(-EINVAL);
+
        /* check sanity of attributes */
        if (attr->max_entries == 0 || attr->key_size != 4 ||
            value_size < 8 || value_size % 8 ||