mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-09-06 09:33:15 +00:00
358 lines
12 KiB
Diff
358 lines
12 KiB
Diff
![]() |
From e860d2c904d1a9f38a24eb44c9f34b8f915a6ea3 Mon Sep 17 00:00:00 2001
|
||
|
From: Ben Seri <ben@armis.com>
|
||
|
Date: Sat, 9 Sep 2017 23:15:59 +0200
|
||
|
Subject: Bluetooth: Properly check L2CAP config option output buffer length
|
||
|
|
||
|
Validate the output buffer length for L2CAP config requests and responses
|
||
|
to avoid overflowing the stack buffer used for building the option blocks.
|
||
|
|
||
|
Cc: stable@vger.kernel.org
|
||
|
Signed-off-by: Ben Seri <ben@armis.com>
|
||
|
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
|
||
|
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
||
|
---
|
||
|
net/bluetooth/l2cap_core.c | 80 +++++++++++++++++++++++++---------------------
|
||
|
1 file changed, 43 insertions(+), 37 deletions(-)
|
||
|
|
||
|
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
|
||
|
index 303c779..43ba91c 100644
|
||
|
--- a/net/bluetooth/l2cap_core.c
|
||
|
+++ b/net/bluetooth/l2cap_core.c
|
||
|
@@ -58,7 +58,7 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
|
||
|
u8 code, u8 ident, u16 dlen, void *data);
|
||
|
static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
|
||
|
void *data);
|
||
|
-static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
|
||
|
+static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size);
|
||
|
static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
|
||
|
|
||
|
static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
|
||
|
@@ -1473,7 +1473,7 @@ static void l2cap_conn_start(struct l2cap_conn *conn)
|
||
|
|
||
|
set_bit(CONF_REQ_SENT, &chan->conf_state);
|
||
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, buf), buf);
|
||
|
+ l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
|
||
|
chan->num_conf_req++;
|
||
|
}
|
||
|
|
||
|
@@ -2987,12 +2987,15 @@ static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
-static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
|
||
|
+static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val, size_t size)
|
||
|
{
|
||
|
struct l2cap_conf_opt *opt = *ptr;
|
||
|
|
||
|
BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
|
||
|
|
||
|
+ if (size < L2CAP_CONF_OPT_SIZE + len)
|
||
|
+ return;
|
||
|
+
|
||
|
opt->type = type;
|
||
|
opt->len = len;
|
||
|
|
||
|
@@ -3017,7 +3020,7 @@ static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
|
||
|
*ptr += L2CAP_CONF_OPT_SIZE + len;
|
||
|
}
|
||
|
|
||
|
-static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
|
||
|
+static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan, size_t size)
|
||
|
{
|
||
|
struct l2cap_conf_efs efs;
|
||
|
|
||
|
@@ -3045,7 +3048,7 @@ static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
|
||
|
}
|
||
|
|
||
|
l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
|
||
|
- (unsigned long) &efs);
|
||
|
+ (unsigned long) &efs, size);
|
||
|
}
|
||
|
|
||
|
static void l2cap_ack_timeout(struct work_struct *work)
|
||
|
@@ -3191,11 +3194,12 @@ static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
|
||
|
chan->ack_win = chan->tx_win;
|
||
|
}
|
||
|
|
||
|
-static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
|
||
|
+static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size)
|
||
|
{
|
||
|
struct l2cap_conf_req *req = data;
|
||
|
struct l2cap_conf_rfc rfc = { .mode = chan->mode };
|
||
|
void *ptr = req->data;
|
||
|
+ void *endptr = data + data_size;
|
||
|
u16 size;
|
||
|
|
||
|
BT_DBG("chan %p", chan);
|
||
|
@@ -3220,7 +3224,7 @@ static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
|
||
|
|
||
|
done:
|
||
|
if (chan->imtu != L2CAP_DEFAULT_MTU)
|
||
|
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
|
||
|
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu, endptr - ptr);
|
||
|
|
||
|
switch (chan->mode) {
|
||
|
case L2CAP_MODE_BASIC:
|
||
|
@@ -3239,7 +3243,7 @@ done:
|
||
|
rfc.max_pdu_size = 0;
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
||
|
- (unsigned long) &rfc);
|
||
|
+ (unsigned long) &rfc, endptr - ptr);
|
||
|
break;
|
||
|
|
||
|
case L2CAP_MODE_ERTM:
|
||
|
@@ -3259,21 +3263,21 @@ done:
|
||
|
L2CAP_DEFAULT_TX_WINDOW);
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
||
|
- (unsigned long) &rfc);
|
||
|
+ (unsigned long) &rfc, endptr - ptr);
|
||
|
|
||
|
if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
|
||
|
- l2cap_add_opt_efs(&ptr, chan);
|
||
|
+ l2cap_add_opt_efs(&ptr, chan, endptr - ptr);
|
||
|
|
||
|
if (test_bit(FLAG_EXT_CTRL, &chan->flags))
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
|
||
|
- chan->tx_win);
|
||
|
+ chan->tx_win, endptr - ptr);
|
||
|
|
||
|
if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
|
||
|
if (chan->fcs == L2CAP_FCS_NONE ||
|
||
|
test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
|
||
|
chan->fcs = L2CAP_FCS_NONE;
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
|
||
|
- chan->fcs);
|
||
|
+ chan->fcs, endptr - ptr);
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
@@ -3291,17 +3295,17 @@ done:
|
||
|
rfc.max_pdu_size = cpu_to_le16(size);
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
||
|
- (unsigned long) &rfc);
|
||
|
+ (unsigned long) &rfc, endptr - ptr);
|
||
|
|
||
|
if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
|
||
|
- l2cap_add_opt_efs(&ptr, chan);
|
||
|
+ l2cap_add_opt_efs(&ptr, chan, endptr - ptr);
|
||
|
|
||
|
if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
|
||
|
if (chan->fcs == L2CAP_FCS_NONE ||
|
||
|
test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
|
||
|
chan->fcs = L2CAP_FCS_NONE;
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
|
||
|
- chan->fcs);
|
||
|
+ chan->fcs, endptr - ptr);
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
@@ -3312,10 +3316,11 @@ done:
|
||
|
return ptr - data;
|
||
|
}
|
||
|
|
||
|
-static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
|
||
|
+static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data_size)
|
||
|
{
|
||
|
struct l2cap_conf_rsp *rsp = data;
|
||
|
void *ptr = rsp->data;
|
||
|
+ void *endptr = data + data_size;
|
||
|
void *req = chan->conf_req;
|
||
|
int len = chan->conf_len;
|
||
|
int type, hint, olen;
|
||
|
@@ -3417,7 +3422,7 @@ done:
|
||
|
return -ECONNREFUSED;
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
||
|
- (unsigned long) &rfc);
|
||
|
+ (unsigned long) &rfc, endptr - ptr);
|
||
|
}
|
||
|
|
||
|
if (result == L2CAP_CONF_SUCCESS) {
|
||
|
@@ -3430,7 +3435,7 @@ done:
|
||
|
chan->omtu = mtu;
|
||
|
set_bit(CONF_MTU_DONE, &chan->conf_state);
|
||
|
}
|
||
|
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
|
||
|
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu, endptr - ptr);
|
||
|
|
||
|
if (remote_efs) {
|
||
|
if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
|
||
|
@@ -3444,7 +3449,7 @@ done:
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
|
||
|
sizeof(efs),
|
||
|
- (unsigned long) &efs);
|
||
|
+ (unsigned long) &efs, endptr - ptr);
|
||
|
} else {
|
||
|
/* Send PENDING Conf Rsp */
|
||
|
result = L2CAP_CONF_PENDING;
|
||
|
@@ -3477,7 +3482,7 @@ done:
|
||
|
set_bit(CONF_MODE_DONE, &chan->conf_state);
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
||
|
- sizeof(rfc), (unsigned long) &rfc);
|
||
|
+ sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
|
||
|
|
||
|
if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
|
||
|
chan->remote_id = efs.id;
|
||
|
@@ -3491,7 +3496,7 @@ done:
|
||
|
le32_to_cpu(efs.sdu_itime);
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
|
||
|
sizeof(efs),
|
||
|
- (unsigned long) &efs);
|
||
|
+ (unsigned long) &efs, endptr - ptr);
|
||
|
}
|
||
|
break;
|
||
|
|
||
|
@@ -3505,7 +3510,7 @@ done:
|
||
|
set_bit(CONF_MODE_DONE, &chan->conf_state);
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
|
||
|
- (unsigned long) &rfc);
|
||
|
+ (unsigned long) &rfc, endptr - ptr);
|
||
|
|
||
|
break;
|
||
|
|
||
|
@@ -3527,10 +3532,11 @@ done:
|
||
|
}
|
||
|
|
||
|
static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
|
||
|
- void *data, u16 *result)
|
||
|
+ void *data, size_t size, u16 *result)
|
||
|
{
|
||
|
struct l2cap_conf_req *req = data;
|
||
|
void *ptr = req->data;
|
||
|
+ void *endptr = data + size;
|
||
|
int type, olen;
|
||
|
unsigned long val;
|
||
|
struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
|
||
|
@@ -3548,13 +3554,13 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
|
||
|
chan->imtu = L2CAP_DEFAULT_MIN_MTU;
|
||
|
} else
|
||
|
chan->imtu = val;
|
||
|
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
|
||
|
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu, endptr - ptr);
|
||
|
break;
|
||
|
|
||
|
case L2CAP_CONF_FLUSH_TO:
|
||
|
chan->flush_to = val;
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
|
||
|
- 2, chan->flush_to);
|
||
|
+ 2, chan->flush_to, endptr - ptr);
|
||
|
break;
|
||
|
|
||
|
case L2CAP_CONF_RFC:
|
||
|
@@ -3568,13 +3574,13 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
|
||
|
chan->fcs = 0;
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
|
||
|
- sizeof(rfc), (unsigned long) &rfc);
|
||
|
+ sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
|
||
|
break;
|
||
|
|
||
|
case L2CAP_CONF_EWS:
|
||
|
chan->ack_win = min_t(u16, val, chan->ack_win);
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
|
||
|
- chan->tx_win);
|
||
|
+ chan->tx_win, endptr - ptr);
|
||
|
break;
|
||
|
|
||
|
case L2CAP_CONF_EFS:
|
||
|
@@ -3587,7 +3593,7 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
|
||
|
return -ECONNREFUSED;
|
||
|
|
||
|
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
|
||
|
- (unsigned long) &efs);
|
||
|
+ (unsigned long) &efs, endptr - ptr);
|
||
|
break;
|
||
|
|
||
|
case L2CAP_CONF_FCS:
|
||
|
@@ -3692,7 +3698,7 @@ void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
|
||
|
return;
|
||
|
|
||
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, buf), buf);
|
||
|
+ l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
|
||
|
chan->num_conf_req++;
|
||
|
}
|
||
|
|
||
|
@@ -3900,7 +3906,7 @@ sendresp:
|
||
|
u8 buf[128];
|
||
|
set_bit(CONF_REQ_SENT, &chan->conf_state);
|
||
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, buf), buf);
|
||
|
+ l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
|
||
|
chan->num_conf_req++;
|
||
|
}
|
||
|
|
||
|
@@ -3978,7 +3984,7 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
|
||
|
break;
|
||
|
|
||
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, req), req);
|
||
|
+ l2cap_build_conf_req(chan, req, sizeof(req)), req);
|
||
|
chan->num_conf_req++;
|
||
|
break;
|
||
|
|
||
|
@@ -4090,7 +4096,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn,
|
||
|
}
|
||
|
|
||
|
/* Complete config. */
|
||
|
- len = l2cap_parse_conf_req(chan, rsp);
|
||
|
+ len = l2cap_parse_conf_req(chan, rsp, sizeof(rsp));
|
||
|
if (len < 0) {
|
||
|
l2cap_send_disconn_req(chan, ECONNRESET);
|
||
|
goto unlock;
|
||
|
@@ -4124,7 +4130,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn,
|
||
|
if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
|
||
|
u8 buf[64];
|
||
|
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, buf), buf);
|
||
|
+ l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
|
||
|
chan->num_conf_req++;
|
||
|
}
|
||
|
|
||
|
@@ -4184,7 +4190,7 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn,
|
||
|
char buf[64];
|
||
|
|
||
|
len = l2cap_parse_conf_rsp(chan, rsp->data, len,
|
||
|
- buf, &result);
|
||
|
+ buf, sizeof(buf), &result);
|
||
|
if (len < 0) {
|
||
|
l2cap_send_disconn_req(chan, ECONNRESET);
|
||
|
goto done;
|
||
|
@@ -4214,7 +4220,7 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn,
|
||
|
/* throw out any old stored conf requests */
|
||
|
result = L2CAP_CONF_SUCCESS;
|
||
|
len = l2cap_parse_conf_rsp(chan, rsp->data, len,
|
||
|
- req, &result);
|
||
|
+ req, sizeof(req), &result);
|
||
|
if (len < 0) {
|
||
|
l2cap_send_disconn_req(chan, ECONNRESET);
|
||
|
goto done;
|
||
|
@@ -4791,7 +4797,7 @@ static void l2cap_do_create(struct l2cap_chan *chan, int result,
|
||
|
set_bit(CONF_REQ_SENT, &chan->conf_state);
|
||
|
l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
|
||
|
L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, buf), buf);
|
||
|
+ l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
|
||
|
chan->num_conf_req++;
|
||
|
}
|
||
|
}
|
||
|
@@ -7465,7 +7471,7 @@ static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
|
||
|
set_bit(CONF_REQ_SENT, &chan->conf_state);
|
||
|
l2cap_send_cmd(conn, l2cap_get_ident(conn),
|
||
|
L2CAP_CONF_REQ,
|
||
|
- l2cap_build_conf_req(chan, buf),
|
||
|
+ l2cap_build_conf_req(chan, buf, sizeof(buf)),
|
||
|
buf);
|
||
|
chan->num_conf_req++;
|
||
|
}
|
||
|
--
|
||
|
cgit v1.1
|
||
|
|