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authorAlexei Starovoitov <ast@fb.com>2016-03-07 21:57:16 -0800
committerDavid S. Miller <davem@davemloft.net>2016-03-08 15:28:31 -0500
commit823707b68d6e6c4b1be619b039c7045fef1740e6 (patch)
tree32149b0605061d1559c51e29a817a48a84ddcf6d /kernel/bpf
parent6c90598174322b8888029e40dd84a4eb01f56afe (diff)
downloadlinux-sh-823707b68d6e6c4b1be619b039c7045fef1740e6.tar.gz
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>
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/arraymap.c2
-rw-r--r--kernel/bpf/stackmap.c3
2 files changed, 4 insertions, 1 deletions
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index bd3bdf2486a7..76d5a794e426 100644
--- 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 8a60ee14a977..f0a02c344358 100644
--- 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 ||