net, neigh: Add build-time assertion to avoid neigh->flags overflow

Currently, NDA_FLAGS_EXT flags allow a maximum of 24 bits to be used for
extended neighbor flags. These are eventually fed into neigh->flags by
shifting with NTF_EXT_SHIFT as per commit 2c611ad97a82 ("net, neigh:
Extend neigh->flags to 32 bit to allow for extensions").

If really ever needed in future, the full 32 bits from NDA_FLAGS_EXT can
be used, it would only require to move neigh->flags from u32 to u64 inside
the kernel.

Add a build-time assertion such that when extending the NTF_EXT_MASK with
new bits, we'll trigger an error once we surpass the 24th bit. This assumes
that no bit holes in new NTF_EXT_* flags will slip in from UAPI, but I
think this is reasonable to assume.

Suggested-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index eae73ef..4fc601f 100644 (file)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1940,6 +1940,9 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
                        NL_SET_ERR_MSG(extack, "Invalid extended flags");
                        goto out;
                }
+               BUILD_BUG_ON(sizeof(neigh->flags) * BITS_PER_BYTE <
+                            (sizeof(ndm->ndm_flags) * BITS_PER_BYTE +
+                             hweight32(NTF_EXT_MASK)));
                ndm_flags |= (ext << NTF_EXT_SHIFT);
        }
        if (ndm->ndm_ifindex) {