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Bluetooth: Fix race condition with conn->sec_level

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The conn->sec_level value is supposed to represent the current level of
security that the connection has. However, by assigning to it before
requesting authentication it will have the wrong value during the
authentication procedure. To fix this a pending_sec_level variable is
added which is used to track the desired security level while making
sure that sec_level always represents the current level of security.

Signed-off-by: Johan Hedberg <johan.hedberg@nokia.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Johan Hedberg 2011-01-19 12:06:52 +05:30 committed by Gustavo F. Padovan
parent d00ef24fc2
commit 765c2a964b
3 changed files with 12 additions and 6 deletions
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1
include/net/bluetooth/hci_core.h
View file

@ -184,6 +184,7 @@ struct hci_conn {
__u32 link_mode;
__u8 auth_type;
__u8 sec_level;
__u8 pending_sec_level;
__u8 power_save;
__u16 disc_timeout;
unsigned long pend;

8
net/bluetooth/hci_conn.c
View file

@ -379,7 +379,8 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8
hci_conn_hold(acl);
if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
acl->sec_level = sec_level;
acl->sec_level = BT_SECURITY_LOW;
acl->pending_sec_level = sec_level;
acl->auth_type = auth_type;
hci_acl_connect(acl);
}
@ -437,8 +438,11 @@ static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
{
BT_DBG("conn %p", conn);
if (conn->pending_sec_level > sec_level)
sec_level = conn->pending_sec_level;
if (sec_level > conn->sec_level)
conn->sec_level = sec_level;
conn->pending_sec_level = sec_level;
else if (conn->link_mode & HCI_LM_AUTH)
return 1;

9
net/bluetooth/hci_event.c
View file

@ -692,13 +692,13 @@ static int hci_outgoing_auth_needed(struct hci_dev *hdev,
if (conn->state != BT_CONFIG || !conn->out)
return 0;
if (conn->sec_level == BT_SECURITY_SDP)
if (conn->pending_sec_level == BT_SECURITY_SDP)
return 0;
/* Only request authentication for SSP connections or non-SSP
* devices with sec_level HIGH */
if (!(hdev->ssp_mode > 0 && conn->ssp_mode > 0) &&
conn->sec_level != BT_SECURITY_HIGH)
conn->pending_sec_level != BT_SECURITY_HIGH)
return 0;
return 1;
@ -1095,9 +1095,10 @@ static inline void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *s
conn = hci_conn_hash_lookup_handle(hdev, __le16_to_cpu(ev->handle));
if (conn) {
if (!ev->status)
if (!ev->status) {
conn->link_mode |= HCI_LM_AUTH;
else
conn->sec_level = conn->pending_sec_level;
} else
conn->sec_level = BT_SECURITY_LOW;
clear_bit(HCI_CONN_AUTH_PEND, &conn->pend);