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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>
This commit is contained in:
Alexei Starovoitov 2016-03-07 21:57:16 -08:00 committed by David S. Miller
parent 6c90598174
commit 823707b68d
2 changed files with 4 additions and 1 deletions
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2
kernel/bpf/arraymap.c
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@ -53,7 +53,7 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
/* check sanity of attributes */ /* check sanity of attributes */
if (attr->max_entries == 0 || attr->key_size != 4 || if (attr->max_entries == 0 || attr->key_size != 4 ||
attr->value_size == 0) attr->value_size == 0 || attr->map_flags)
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
if (attr->value_size >= 1 << (KMALLOC_SHIFT_MAX - 1)) if (attr->value_size >= 1 << (KMALLOC_SHIFT_MAX - 1))

3
kernel/bpf/stackmap.c
View File

@ -35,6 +35,9 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
if (!capable(CAP_SYS_ADMIN)) if (!capable(CAP_SYS_ADMIN))
return ERR_PTR(-EPERM); return ERR_PTR(-EPERM);
if (attr->map_flags)
return ERR_PTR(-EINVAL);
/* check sanity of attributes */ /* check sanity of attributes */
if (attr->max_entries == 0 || attr->key_size != 4 || if (attr->max_entries == 0 || attr->key_size != 4 ||
value_size < 8 || value_size % 8 || value_size < 8 || value_size % 8 ||