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Bluetooth: Add packet size checks for CAPI messages (CVE-2006-6106)

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With malformed packets it might be possible to overwrite internal
CMTP and CAPI data structures. This patch adds additional length
checks to prevent these kinds of remote attacks.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
This commit is contained in:
Marcel Holtmann
2007-01-04 22:57:52 +01:00
committed by Adrian Bunk
parent d9be428145
commit 044a3e96c4
1 changed files with 33 additions and 6 deletions
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net/bluetooth/cmtp/capi.c
+33 -6
View File
@@ -199,6 +199,9 @@ static void cmtp_recv_interopmsg(struct cmtp_session *session, struct sk_buff *s
switch (CAPIMSG_SUBCOMMAND(skb->data)) {
case CAPI_CONF:
if (skb->len < CAPI_MSG_BASELEN + 10)
break;
func = CAPIMSG_U16(skb->data, CAPI_MSG_BASELEN + 5);
info = CAPIMSG_U16(skb->data, CAPI_MSG_BASELEN + 8);
@@ -229,6 +232,9 @@ static void cmtp_recv_interopmsg(struct cmtp_session *session, struct sk_buff *s
break;
case CAPI_FUNCTION_GET_PROFILE:
if (skb->len < CAPI_MSG_BASELEN + 11 + sizeof(capi_profile))
break;
controller = CAPIMSG_U16(skb->data, CAPI_MSG_BASELEN + 11);
msgnum = CAPIMSG_MSGID(skb->data);
@@ -249,17 +255,26 @@ static void cmtp_recv_interopmsg(struct cmtp_session *session, struct sk_buff *s
break;
case CAPI_FUNCTION_GET_MANUFACTURER:
if (skb->len < CAPI_MSG_BASELEN + 15)
break;
controller = CAPIMSG_U32(skb->data, CAPI_MSG_BASELEN + 10);
if (!info && ctrl) {
int len = min_t(uint, CAPI_MANUFACTURER_LEN,
skb->data[CAPI_MSG_BASELEN + 14]);
memset(ctrl->manu, 0, CAPI_MANUFACTURER_LEN);
strncpy(ctrl->manu,
skb->data + CAPI_MSG_BASELEN + 15,
skb->data[CAPI_MSG_BASELEN + 14]);
skb->data + CAPI_MSG_BASELEN + 15, len);
}
break;
case CAPI_FUNCTION_GET_VERSION:
if (skb->len < CAPI_MSG_BASELEN + 32)
break;
controller = CAPIMSG_U32(skb->data, CAPI_MSG_BASELEN + 12);
if (!info && ctrl) {
@@ -272,13 +287,18 @@ static void cmtp_recv_interopmsg(struct cmtp_session *session, struct sk_buff *s
break;
case CAPI_FUNCTION_GET_SERIAL_NUMBER:
if (skb->len < CAPI_MSG_BASELEN + 17)
break;
controller = CAPIMSG_U32(skb->data, CAPI_MSG_BASELEN + 12);
if (!info && ctrl) {
int len = min_t(uint, CAPI_SERIAL_LEN,
skb->data[CAPI_MSG_BASELEN + 16]);
memset(ctrl->serial, 0, CAPI_SERIAL_LEN);
strncpy(ctrl->serial,
skb->data + CAPI_MSG_BASELEN + 17,
skb->data[CAPI_MSG_BASELEN + 16]);
skb->data + CAPI_MSG_BASELEN + 17, len);
}
break;
@@ -287,14 +307,18 @@ static void cmtp_recv_interopmsg(struct cmtp_session *session, struct sk_buff *s
break;
case CAPI_IND:
if (skb->len < CAPI_MSG_BASELEN + 6)
break;
func = CAPIMSG_U16(skb->data, CAPI_MSG_BASELEN + 3);
if (func == CAPI_FUNCTION_LOOPBACK) {
int len = min_t(uint, skb->len - CAPI_MSG_BASELEN - 6,
skb->data[CAPI_MSG_BASELEN + 5]);
appl = CAPIMSG_APPID(skb->data);
msgnum = CAPIMSG_MSGID(skb->data);
cmtp_send_interopmsg(session, CAPI_RESP, appl, msgnum, func,
skb->data + CAPI_MSG_BASELEN + 6,
skb->data[CAPI_MSG_BASELEN + 5]);
skb->data + CAPI_MSG_BASELEN + 6, len);
}
break;
@@ -312,6 +336,9 @@ void cmtp_recv_capimsg(struct cmtp_session *session, struct sk_buff *skb)
BT_DBG("session %p skb %p len %d", session, skb, skb->len);
if (skb->len < CAPI_MSG_BASELEN)
return;
if (CAPIMSG_COMMAND(skb->data) == CAPI_INTEROPERABILITY) {
cmtp_recv_interopmsg(session, skb);
return;