Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]Bluetooth: hci_sock: Prevent race in socket write iter and sock bind[EOL][EOL]There is a potential race condition between sock bind and socket write[EOL]iter. bind may free the same cmd via mgmt_pending before write iter sends[EOL]the cmd, just as syzbot reported in UAF[1].[EOL][EOL]Here we use hci_dev_lock to synchronize the two, thereby avoiding the[EOL]UAF mentioned in [1].[EOL][EOL][1][EOL]syzbot reported:[EOL]BUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316[EOL]Read of size 8 at addr ffff888077164818 by task syz.0.17/5989[EOL]Call Trace:[EOL] mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316[EOL] set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918[EOL] hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719[EOL] hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839[EOL] sock_sendmsg_nosec net/socket.c:727 [inline][EOL] __sock_sendmsg+0x21c/0x270 net/socket.c:742[EOL] sock_write_iter+0x279/0x360 net/socket.c:1195[EOL][EOL]Allocated by task 5989:[EOL] mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296[EOL] set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910[EOL] hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719[EOL] hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839[EOL] sock_sendmsg_nosec net/socket.c:727 [inline][EOL] __sock_sendmsg+0x21c/0x270 net/socket.c:742[EOL] sock_write_iter+0x279/0x360 net/socket.c:1195[EOL][EOL]Freed by task 5991:[EOL] mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline][EOL] mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257[EOL] mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477[EOL] hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314