From: Marcel Holtmann <marcel@holtmann.org>
Date: Sun, 15 Mar 2015 02:28:03 +0000 (-0700)
Subject: Bluetooth: Add support for trust verification of management commands
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c927a10487477eeed0441e5c88147700e69e5db9;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

Bluetooth: Add support for trust verification of management commands

Check the required trust level of each management command with the trust
level of the management socket. If it does not match up, then return the
newly introduced permission denied error.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
---

diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index 2534bd4d22b2..f3baad589db0 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -44,6 +44,7 @@
 #define MGMT_STATUS_INVALID_INDEX	0x11
 #define MGMT_STATUS_RFKILLED		0x12
 #define MGMT_STATUS_ALREADY_PAIRED	0x13
+#define MGMT_STATUS_PERMISSION_DENIED	0x14
 
 struct mgmt_hdr {
 	__le16	opcode;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 2162f7bc89be..920acf0625f6 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -6379,6 +6379,13 @@ int mgmt_control(struct hci_mgmt_chan *chan, struct sock *sk,
 
 	handler = &chan->handlers[opcode];
 
+	if (!hci_sock_test_flag(sk, HCI_SOCK_TRUSTED) &&
+	    !(handler->flags & HCI_MGMT_UNTRUSTED)) {
+		err = mgmt_cmd_status(sk, index, opcode,
+				      MGMT_STATUS_PERMISSION_DENIED);
+		goto done;
+	}
+
 	if (index != MGMT_INDEX_NONE) {
 		hdev = hci_dev_get(index);
 		if (!hdev) {