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| author | Johan Hedberg <johan.hedberg@intel.com> | 2013-10-18 11:49:25 +0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2013-10-18 01:53:57 -0700 |
| commit | eb622495e89879bb7d62bb27b2561a306bbe2401 (patch) | |
| tree | 7b3c5955524ca3c83f84ff5d8ded8c2ef02ac23a /net/bluetooth | |
| parent | 2bfa3531f654d82db01d3121ae2de7a8696a4555 (diff) | |
| download | linux-eb622495e89879bb7d62bb27b2561a306bbe2401.tar.gz linux-eb622495e89879bb7d62bb27b2561a306bbe2401.tar.bz2 linux-eb622495e89879bb7d62bb27b2561a306bbe2401.zip | |
Bluetooth: Fix ATT socket backwards compatibility with user space
Old user space versions bind the Attribute Protocol socket to
BDADDR_BREDR when they should be using BDADDR_LE_PUBLIC or
BDADDR_LE_RANDOM. The kernel recently introduced stricter checks on the
socket parameters but we need to punch this hole for old user space
versions to keep them working.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/l2cap_sock.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index 34e5a58ffca8..1f326d9d9132 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -159,8 +159,31 @@ static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, if (!bdaddr_type_is_valid(la.l2_bdaddr_type)) return -EINVAL; - if (chan->src_type == BDADDR_BREDR && la.l2_bdaddr_type != BDADDR_BREDR) - return -EINVAL; + /* Check that the socket wasn't bound to something that + * conflicts with the address given to connect(). If chan->src + * is BDADDR_ANY it means bind() was never used, in which case + * chan->src_type and la.l2_bdaddr_type do not need to match. + */ + if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) && + bdaddr_type_is_le(la.l2_bdaddr_type)) { + /* Old user space versions will try to incorrectly bind + * the ATT socket using BDADDR_BREDR. We need to accept + * this and fix up the source address type only when + * both the source CID and destination CID indicate + * ATT. Anything else is an invalid combination. + */ + if (chan->scid != L2CAP_CID_ATT || + la.l2_cid != __constant_cpu_to_le16(L2CAP_CID_ATT)) + return -EINVAL; + + /* We don't have the hdev available here to make a + * better decision on random vs public, but since all + * user space versions that exhibit this issue anyway do + * not support random local addresses assuming public + * here is good enough. + */ + chan->src_type = BDADDR_LE_PUBLIC; + } if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR) return -EINVAL; |