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DivestOS/Patches/Linux_CVEs/CVE-2017-1000251/3.0/0001.patch
Tad 11c7037780 Switch to new CVE patchset
2017-11-07 17:32:46 -05:00

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From 2e073d2001f354982b777a38d931002a62395de1 Mon Sep 17 00:00:00 2001
From: Ben Seri <ben@armis.com>
Date: Sat, 09 Sep 2017 23:15:59 +0200
Subject: [PATCH] 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.
Change-Id: I7a0ff0b9dd0156c0e6383214a9c86e4ec4c0d236
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>
CVE-2017-1000251
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
---
diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h
index ef5e849..b868343 100644
--- a/include/net/bluetooth/l2cap.h
+++ b/include/net/bluetooth/l2cap.h
@@ -668,7 +668,7 @@
u8 l2cap_get_ident(struct l2cap_conn *conn);
void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data);
-int l2cap_build_conf_req(struct sock *sk, void *data);
+int l2cap_build_conf_req(struct sock *sk, void *data, size_t data_size);
int __l2cap_wait_ack(struct sock *sk);
struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len);
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index af0dcba..a4ab0ff 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -910,7 +910,7 @@
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
+ l2cap_build_conf_req(sk, buf, sizeof(buf)), buf);
l2cap_pi(sk)->num_conf_req++;
}
@@ -2892,11 +2892,14 @@
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 %d val 0x%lx", type, len, val);
+
+ if (size < L2CAP_CONF_OPT_SIZE + len)
+ return;
opt->type = type;
opt->len = len;
@@ -3275,12 +3278,13 @@
}
}
-int l2cap_build_conf_req(struct sock *sk, void *data)
+int l2cap_build_conf_req(struct sock *sk, void *data, size_t data_size)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct l2cap_conf_req *req = data;
struct l2cap_conf_rfc rfc = { .mode = pi->mode };
void *ptr = req->data;
+ void *endptr = data + data_size;
BT_DBG("sk %p", sk);
@@ -3301,7 +3305,7 @@
done:
if (pi->imtu != L2CAP_DEFAULT_MTU)
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu, endptr - ptr);
switch (pi->mode) {
case L2CAP_MODE_BASIC:
@@ -3316,7 +3320,7 @@
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:
@@ -3333,12 +3337,12 @@
rfc.max_pdu_size = cpu_to_le16(pi->imtu);
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
- (unsigned long) &rfc);
+ (unsigned long) &rfc, endptr - ptr);
if ((pi->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW) &&
pi->extended_control) {
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_WINDOW, 2,
- pi->tx_win);
+ pi->tx_win, endptr - ptr);
}
if (pi->amp_id) {
@@ -3346,7 +3350,7 @@
struct l2cap_conf_ext_fs fs = {1, 1, 0xFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF};
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_FS,
- sizeof(fs), (unsigned long) &fs);
+ sizeof(fs), (unsigned long) &fs, endptr - ptr);
}
if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
@@ -3355,7 +3359,7 @@
if (pi->fcs == L2CAP_FCS_NONE ||
pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
pi->fcs = L2CAP_FCS_NONE;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs, endptr - ptr);
}
break;
@@ -3369,11 +3373,11 @@
rfc.max_pdu_size = cpu_to_le16(pi->imtu);
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
- (unsigned long) &rfc);
+ (unsigned long) &rfc, endptr - ptr);
if ((pi->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW) &&
pi->extended_control) {
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_WINDOW, 2, 0);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_WINDOW, 2, 0, endptr - ptr);
}
if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
@@ -3382,7 +3386,7 @@
if (pi->fcs == L2CAP_FCS_NONE ||
pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
pi->fcs = L2CAP_FCS_NONE;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs, endptr - ptr);
}
break;
}
@@ -3394,12 +3398,13 @@
}
-static int l2cap_build_amp_reconf_req(struct sock *sk, void *data)
+static int l2cap_build_amp_reconf_req(struct sock *sk, void *data, size_t data_size)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct l2cap_conf_req *req = data;
struct l2cap_conf_rfc rfc = { .mode = pi->mode };
void *ptr = req->data;
+ void *endptr = data + data_size;
BT_DBG("sk %p", sk);
@@ -3420,7 +3425,7 @@
}
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
- (unsigned long) &rfc);
+ (unsigned long) &rfc, endptr - ptr);
if (pi->conn->feat_mask & L2CAP_FEAT_FCS) {
/* TODO assign fcs for br/edr based on socket config option */
@@ -3431,7 +3436,7 @@
else
pi->local_conf.fcs = L2CAP_FCS_CRC16;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->local_conf.fcs);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->local_conf.fcs, endptr - ptr);
pi->fcs = pi->local_conf.fcs | pi->remote_conf.fcs;
}
@@ -3441,11 +3446,12 @@
return ptr - data;
}
-static int l2cap_parse_conf_req(struct sock *sk, void *data)
+static int l2cap_parse_conf_req(struct sock *sk, void *data, size_t data_size)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct l2cap_conf_rsp *rsp = data;
void *ptr = rsp->data;
+ void *endptr = data + data_size;
void *req = pi->conf_req;
int len = pi->conf_len;
int type, hint, olen;
@@ -3563,7 +3569,8 @@
return -ECONNREFUSED;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
+ sizeof(rfc), (unsigned long) &rfc,
+ endptr - ptr);
}
@@ -3583,7 +3590,7 @@
pi->omtu = mtu;
pi->conf_state |= L2CAP_CONF_MTU_DONE;
}
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu, endptr - ptr);
switch (rfc.mode) {
case L2CAP_MODE_BASIC:
@@ -3601,11 +3608,11 @@
pi->conf_state |= L2CAP_CONF_MODE_DONE;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
+ sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
if (pi->conf_state & L2CAP_CONF_LOCKSTEP)
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_FS,
- sizeof(fs), (unsigned long) &fs);
+ sizeof(fs), (unsigned long) &fs, endptr - ptr);
break;
@@ -3615,7 +3622,7 @@
pi->conf_state |= L2CAP_CONF_MODE_DONE;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
+ sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
break;
@@ -3659,11 +3666,12 @@
return ptr - data;
}
-static int l2cap_parse_amp_move_reconf_req(struct sock *sk, void *data)
+static int l2cap_parse_amp_move_reconf_req(struct sock *sk, void *data, size_t data_size)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct l2cap_conf_rsp *rsp = data;
void *ptr = rsp->data;
+ void *endptr = data + data_size;
void *req = pi->conf_req;
int len = pi->conf_len;
int type, hint, olen;
@@ -3750,13 +3758,13 @@
BT_DBG("mtu %d omtu %d", mtu, pi->omtu);
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu, endptr - ptr);
/* Don't allow extended transmit window to change. */
if (tx_win != pi->remote_tx_win) {
result = L2CAP_CONF_UNACCEPT;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_WINDOW, 2,
- pi->remote_tx_win);
+ pi->remote_tx_win, endptr - ptr);
}
pi->remote_mps = rfc.max_pdu_size;
@@ -3769,7 +3777,7 @@
}
l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
- sizeof(rfc), (unsigned long) &rfc);
+ sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
}
if (result != L2CAP_CONF_SUCCESS)
@@ -3788,11 +3796,12 @@
return ptr - data;
}
-static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
+static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, size_t size, u16 *result)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
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;
@@ -3815,13 +3824,13 @@
pi->imtu = L2CAP_DEFAULT_MIN_MTU;
} else
pi->imtu = val;
- l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
+ l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu, endptr - ptr);
break;
case L2CAP_CONF_FLUSH_TO:
pi->flush_to = val;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
- 2, pi->flush_to);
+ 2, pi->flush_to, endptr - ptr);
break;
case L2CAP_CONF_RFC:
@@ -3835,7 +3844,7 @@
pi->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_EXT_WINDOW:
@@ -3845,7 +3854,7 @@
pi->tx_win = L2CAP_TX_WIN_MAX_ENHANCED;
l2cap_add_conf_opt(&ptr, L2CAP_CONF_EXT_WINDOW,
- 2, pi->tx_win);
+ 2, pi->tx_win, endptr - ptr);
break;
default:
@@ -4204,7 +4213,7 @@
u8 buf[128];
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
+ l2cap_build_conf_req(sk, buf, sizeof(buf)), buf);
l2cap_pi(sk)->num_conf_req++;
}
@@ -4255,7 +4264,7 @@
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, req), req);
+ l2cap_build_conf_req(sk, req, sizeof(req)), req);
l2cap_pi(sk)->num_conf_req++;
break;
@@ -4359,9 +4368,9 @@
/* Complete config. */
if (!amp_move_reconf)
- len = l2cap_parse_conf_req(sk, rspbuf);
+ len = l2cap_parse_conf_req(sk, rspbuf, sizeof(rspbuf));
else
- len = l2cap_parse_amp_move_reconf_req(sk, rspbuf);
+ len = l2cap_parse_amp_move_reconf_req(sk, rspbuf, sizeof(rspbuf));
if (len < 0) {
l2cap_send_disconn_req(conn, sk, ECONNRESET);
@@ -4410,7 +4419,7 @@
u8 buf[64];
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
+ l2cap_build_conf_req(sk, buf, sizeof(buf)), buf);
l2cap_pi(sk)->num_conf_req++;
}
@@ -4506,7 +4515,7 @@
/* throw out any old stored conf requests */
result = L2CAP_CONF_SUCCESS;
len = l2cap_parse_conf_rsp(sk, rsp->data,
- len, req, &result);
+ len, req, sizeof(req), &result);
if (len < 0) {
l2cap_send_disconn_req(conn, sk, ECONNRESET);
goto done;
@@ -5306,7 +5315,7 @@
l2cap_send_cmd(pi->conn,
l2cap_get_ident(pi->conn),
L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
+ l2cap_build_conf_req(sk, buf, sizeof(buf)), buf);
l2cap_pi(sk)->num_conf_req++;
}
} else {
@@ -6870,7 +6879,7 @@
pi = l2cap_pi(sk);
l2cap_send_cmd(pi->conn, l2cap_get_ident(pi->conn), L2CAP_CONF_REQ,
- l2cap_build_amp_reconf_req(sk, buf), buf);
+ l2cap_build_amp_reconf_req(sk, buf, sizeof(buf)), buf);
return err;
}
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 6e229d1..aa17999 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1031,7 +1031,7 @@
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
- l2cap_build_conf_req(sk, buf), buf);
+ l2cap_build_conf_req(sk, buf, sizeof(buf)), buf);
l2cap_pi(sk)->num_conf_req++;
release_sock(sk);
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