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Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync

Browse Source 
Use-after-free can occur in hci_disconnect_all_sync if a connection is
deleted by concurrent processing of a controller event.

To prevent this the code now tries to iterate over the list backwards
to ensure the links are cleanup before its parents, also it no longer
relies on a cursor, instead it always uses the last element since
hci_abort_conn_sync is guaranteed to call hci_conn_del.

UAF crash log:
==================================================================
BUG: KASAN: slab-use-after-free in hci_set_powered_sync
(net/bluetooth/hci_sync.c:5424) [bluetooth]
Read of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124

CPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G        W
6.5.0-rc1+ #10
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
1.16.2-1.fc38 04/01/2014
Workqueue: hci0 hci_cmd_sync_work [bluetooth]
Call Trace:
 <TASK>
 dump_stack_lvl+0x5b/0x90
 print_report+0xcf/0x670
 ? __virt_addr_valid+0xdd/0x160
 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]
 kasan_report+0xa6/0xe0
 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]
 ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]
 hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]
 ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth]
 ? __pfx_lock_release+0x10/0x10
 ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]
 hci_cmd_sync_work+0x137/0x220 [bluetooth]
 process_one_work+0x526/0x9d0
 ? __pfx_process_one_work+0x10/0x10
 ? __pfx_do_raw_spin_lock+0x10/0x10
 ? mark_held_locks+0x1a/0x90
 worker_thread+0x92/0x630
 ? __pfx_worker_thread+0x10/0x10
 kthread+0x196/0x1e0
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x2c/0x50
 </TASK>

Allocated by task 1782:
 kasan_save_stack+0x33/0x60
 kasan_set_track+0x25/0x30
 __kasan_kmalloc+0x8f/0xa0
 hci_conn_add+0xa5/0xa80 [bluetooth]
 hci_bind_cis+0x881/0x9b0 [bluetooth]
 iso_connect_cis+0x121/0x520 [bluetooth]
 iso_sock_connect+0x3f6/0x790 [bluetooth]
 __sys_connect+0x109/0x130
 __x64_sys_connect+0x40/0x50
 do_syscall_64+0x60/0x90
 entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Freed by task 695:
 kasan_save_stack+0x33/0x60
 kasan_set_track+0x25/0x30
 kasan_save_free_info+0x2b/0x50
 __kasan_slab_free+0x10a/0x180
 __kmem_cache_free+0x14d/0x2e0
 device_release+0x5d/0xf0
 kobject_put+0xdf/0x270
 hci_disconn_complete_evt+0x274/0x3a0 [bluetooth]
 hci_event_packet+0x579/0x7e0 [bluetooth]
 hci_rx_work+0x287/0xaa0 [bluetooth]
 process_one_work+0x526/0x9d0
 worker_thread+0x92/0x630
 kthread+0x196/0x1e0
 ret_from_fork+0x2c/0x50
==================================================================

Fixes: 182ee45da0 ("Bluetooth: hci_sync: Rework hci_suspend_notifier")
Signed-off-by: Pauli Virtanen <pav@iki.fi>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2023-08-09 16:49:33 -07:00
parent 491f9eff27
commit 94d9ba9f98
1 changed files with 35 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
net/bluetooth/hci_sync.c
View File

@ -5370,6 +5370,7 @@ int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn, u8 reason)
{
int err = 0;
u16 handle = conn->handle;
struct hci_conn *c;
switch (conn->state) {
case BT_CONNECTED:
@ -5389,43 +5390,57 @@ int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn, u8 reason)
hci_dev_unlock(hdev);
return 0;
default:
hci_dev_lock(hdev);
conn->state = BT_CLOSED;
hci_disconn_cfm(conn, reason);
hci_conn_del(conn);
hci_dev_unlock(hdev);
return 0;
}
hci_dev_lock(hdev);
/* Check if the connection hasn't been cleanup while waiting
* commands to complete.
*/
c = hci_conn_hash_lookup_handle(hdev, handle);
if (!c || c != conn) {
err = 0;
goto unlock;
}
/* Cleanup hci_conn object if it cannot be cancelled as it
* likelly means the controller and host stack are out of sync
* or in case of LE it was still scanning so it can be cleanup
* safely.
*/
if (err) {
struct hci_conn *c;
/* Check if the connection hasn't been cleanup while waiting
* commands to complete.
*/
c = hci_conn_hash_lookup_handle(hdev, handle);
if (!c || c != conn)
return 0;
hci_dev_lock(hdev);
hci_conn_failed(conn, err);
hci_dev_unlock(hdev);
}
hci_conn_failed(conn, reason);
unlock:
hci_dev_unlock(hdev);
return err;
}
static int hci_disconnect_all_sync(struct hci_dev *hdev, u8 reason)
{
struct hci_conn *conn, *tmp;
int err;
struct list_head *head = &hdev->conn_hash.list;
struct hci_conn *conn;
list_for_each_entry_safe(conn, tmp, &hdev->conn_hash.list, list) {
err = hci_abort_conn_sync(hdev, conn, reason);
if (err)
return err;
rcu_read_lock();
while ((conn = list_first_or_null_rcu(head, struct hci_conn, list))) {
/* Make sure the connection is not freed while unlocking */
conn = hci_conn_get(conn);
rcu_read_unlock();
/* Disregard possible errors since hci_conn_del shall have been
* called even in case of errors had occurred since it would
* then cause hci_conn_failed to be called which calls
* hci_conn_del internally.
*/
hci_abort_conn_sync(hdev, conn, reason);
hci_conn_put(conn);
rcu_read_lock();
}
rcu_read_unlock();
return 0;
}