1. 02 Feb, 2023 10 commits
  2. 01 Feb, 2023 5 commits
  3. 31 Jan, 2023 7 commits
  4. 30 Jan, 2023 3 commits
    • Colin Foster's avatar
      net: phy: fix null dereference in phy_attach_direct · 73a87602
      Colin Foster authored
      Commit bc66fa87 ("net: phy: Add link between phy dev and mac dev")
      introduced a link between net devices and phy devices. It fails to check
      whether dev is NULL, leading to a NULL dereference error.
      
      Fixes: bc66fa87 ("net: phy: Add link between phy dev and mac dev")
      Signed-off-by: default avatarColin Foster <colin.foster@in-advantage.com>
      Reviewed-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      73a87602
    • Hyunwoo Kim's avatar
      netrom: Fix use-after-free caused by accept on already connected socket · 61179292
      Hyunwoo Kim authored
      If you call listen() and accept() on an already connect()ed
      AF_NETROM socket, accept() can successfully connect.
      This is because when the peer socket sends data to sendmsg,
      the skb with its own sk stored in the connected socket's
      sk->sk_receive_queue is connected, and nr_accept() dequeues
      the skb waiting in the sk->sk_receive_queue.
      
      As a result, nr_accept() allocates and returns a sock with
      the sk of the parent AF_NETROM socket.
      
      And here use-after-free can happen through complex race conditions:
      ```
                        cpu0                                                     cpu1
                                                                     1. socket_2 = socket(AF_NETROM)
                                                                              .
                                                                              .
                                                                        listen(socket_2)
                                                                        accepted_socket = accept(socket_2)
             2. socket_1 = socket(AF_NETROM)
                  nr_create()    // sk refcount : 1
                connect(socket_1)
                                                                     3. write(accepted_socket)
                                                                          nr_sendmsg()
                                                                          nr_output()
                                                                          nr_kick()
                                                                          nr_send_iframe()
                                                                          nr_transmit_buffer()
                                                                          nr_route_frame()
                                                                          nr_loopback_queue()
                                                                          nr_loopback_timer()
                                                                          nr_rx_frame()
                                                                          nr_process_rx_frame(sk, skb);    // sk : socket_1's sk
                                                                          nr_state3_machine()
                                                                          nr_queue_rx_frame()
                                                                          sock_queue_rcv_skb()
                                                                          sock_queue_rcv_skb_reason()
                                                                          __sock_queue_rcv_skb()
                                                                          __skb_queue_tail(list, skb);    // list : socket_1's sk->sk_receive_queue
             4. listen(socket_1)
                  nr_listen()
                uaf_socket = accept(socket_1)
                  nr_accept()
                  skb_dequeue(&sk->sk_receive_queue);
                                                                     5. close(accepted_socket)
                                                                          nr_release()
                                                                          nr_write_internal(sk, NR_DISCREQ)
                                                                          nr_transmit_buffer()    // NR_DISCREQ
                                                                          nr_route_frame()
                                                                          nr_loopback_queue()
                                                                          nr_loopback_timer()
                                                                          nr_rx_frame()    // sk : socket_1's sk
                                                                          nr_process_rx_frame()  // NR_STATE_3
                                                                          nr_state3_machine()    // NR_DISCREQ
                                                                          nr_disconnect()
                                                                          nr_sk(sk)->state = NR_STATE_0;
             6. close(socket_1)    // sk refcount : 3
                  nr_release()    // NR_STATE_0
                  sock_put(sk);    // sk refcount : 0
                  sk_free(sk);
                close(uaf_socket)
                  nr_release()
                  sock_hold(sk);    // UAF
      ```
      
      KASAN report by syzbot:
      ```
      BUG: KASAN: use-after-free in nr_release+0x66/0x460 net/netrom/af_netrom.c:520
      Write of size 4 at addr ffff8880235d8080 by task syz-executor564/5128
      
      Call Trace:
       <TASK>
       __dump_stack lib/dump_stack.c:88 [inline]
       dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
       print_address_description mm/kasan/report.c:306 [inline]
       print_report+0x15e/0x461 mm/kasan/report.c:417
       kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
       check_region_inline mm/kasan/generic.c:183 [inline]
       kasan_check_range+0x141/0x190 mm/kasan/generic.c:189
       instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
       atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline]
       __refcount_add include/linux/refcount.h:193 [inline]
       __refcount_inc include/linux/refcount.h:250 [inline]
       refcount_inc include/linux/refcount.h:267 [inline]
       sock_hold include/net/sock.h:775 [inline]
       nr_release+0x66/0x460 net/netrom/af_netrom.c:520
       __sock_release+0xcd/0x280 net/socket.c:650
       sock_close+0x1c/0x20 net/socket.c:1365
       __fput+0x27c/0xa90 fs/file_table.c:320
       task_work_run+0x16f/0x270 kernel/task_work.c:179
       exit_task_work include/linux/task_work.h:38 [inline]
       do_exit+0xaa8/0x2950 kernel/exit.c:867
       do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
       get_signal+0x21c3/0x2450 kernel/signal.c:2859
       arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
       exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
       exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
       __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
       syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
       do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
       entry_SYSCALL_64_after_hwframe+0x63/0xcd
      RIP: 0033:0x7f6c19e3c9b9
      Code: Unable to access opcode bytes at 0x7f6c19e3c98f.
      RSP: 002b:00007fffd4ba2ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
      RAX: 0000000000000116 RBX: 0000000000000003 RCX: 00007f6c19e3c9b9
      RDX: 0000000000000318 RSI: 00000000200bd000 RDI: 0000000000000006
      RBP: 0000000000000003 R08: 000000000000000d R09: 000000000000000d
      R10: 0000000000000000 R11: 0000000000000246 R12: 000055555566a2c0
      R13: 0000000000000011 R14: 0000000000000000 R15: 0000000000000000
       </TASK>
      
      Allocated by task 5128:
       kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
       kasan_set_track+0x25/0x30 mm/kasan/common.c:52
       ____kasan_kmalloc mm/kasan/common.c:371 [inline]
       ____kasan_kmalloc mm/kasan/common.c:330 [inline]
       __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:380
       kasan_kmalloc include/linux/kasan.h:211 [inline]
       __do_kmalloc_node mm/slab_common.c:968 [inline]
       __kmalloc+0x5a/0xd0 mm/slab_common.c:981
       kmalloc include/linux/slab.h:584 [inline]
       sk_prot_alloc+0x140/0x290 net/core/sock.c:2038
       sk_alloc+0x3a/0x7a0 net/core/sock.c:2091
       nr_create+0xb6/0x5f0 net/netrom/af_netrom.c:433
       __sock_create+0x359/0x790 net/socket.c:1515
       sock_create net/socket.c:1566 [inline]
       __sys_socket_create net/socket.c:1603 [inline]
       __sys_socket_create net/socket.c:1588 [inline]
       __sys_socket+0x133/0x250 net/socket.c:1636
       __do_sys_socket net/socket.c:1649 [inline]
       __se_sys_socket net/socket.c:1647 [inline]
       __x64_sys_socket+0x73/0xb0 net/socket.c:1647
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd
      
      Freed by task 5128:
       kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
       kasan_set_track+0x25/0x30 mm/kasan/common.c:52
       kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:518
       ____kasan_slab_free mm/kasan/common.c:236 [inline]
       ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200
       kasan_slab_free include/linux/kasan.h:177 [inline]
       __cache_free mm/slab.c:3394 [inline]
       __do_kmem_cache_free mm/slab.c:3580 [inline]
       __kmem_cache_free+0xcd/0x3b0 mm/slab.c:3587
       sk_prot_free net/core/sock.c:2074 [inline]
       __sk_destruct+0x5df/0x750 net/core/sock.c:2166
       sk_destruct net/core/sock.c:2181 [inline]
       __sk_free+0x175/0x460 net/core/sock.c:2192
       sk_free+0x7c/0xa0 net/core/sock.c:2203
       sock_put include/net/sock.h:1991 [inline]
       nr_release+0x39e/0x460 net/netrom/af_netrom.c:554
       __sock_release+0xcd/0x280 net/socket.c:650
       sock_close+0x1c/0x20 net/socket.c:1365
       __fput+0x27c/0xa90 fs/file_table.c:320
       task_work_run+0x16f/0x270 kernel/task_work.c:179
       exit_task_work include/linux/task_work.h:38 [inline]
       do_exit+0xaa8/0x2950 kernel/exit.c:867
       do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
       get_signal+0x21c3/0x2450 kernel/signal.c:2859
       arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
       exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
       exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
       __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
       syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
       do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
       entry_SYSCALL_64_after_hwframe+0x63/0xcd
      ```
      
      To fix this issue, nr_listen() returns -EINVAL for sockets that
      successfully nr_connect().
      
      Reported-by: syzbot+caa188bdfc1eeafeb418@syzkaller.appspotmail.com
      Fixes: 1da177e4 ("Linux-2.6.12-rc2")
      Signed-off-by: default avatarHyunwoo Kim <v4bel@theori.io>
      Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@amazon.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      61179292
    • Andrey Konovalov's avatar
      net: stmmac: do not stop RX_CLK in Rx LPI state for qcs404 SoC · 54aa39a5
      Andrey Konovalov authored
      Currently in phy_init_eee() the driver unconditionally configures the PHY
      to stop RX_CLK after entering Rx LPI state. This causes an LPI interrupt
      storm on my qcs404-base board.
      
      Change the PHY initialization so that for "qcom,qcs404-ethqos" compatible
      device RX_CLK continues to run even in Rx LPI state.
      Signed-off-by: default avatarAndrey Konovalov <andrey.konovalov@linaro.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      54aa39a5
  5. 28 Jan, 2023 15 commits