• J
    bonding: wait for sysfs kobject destruction before freeing struct slave · b9ad3e9f
    Jamie Iles 提交于
    syzkaller found that with CONFIG_DEBUG_KOBJECT_RELEASE=y, releasing a
    struct slave device could result in the following splat:
    
      kobject: 'bonding_slave' (00000000cecdd4fe): kobject_release, parent 0000000074ceb2b2 (delayed 1000)
      bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
      ------------[ cut here ]------------
      ODEBUG: free active (active state 0) object type: timer_list hint: workqueue_select_cpu_near kernel/workqueue.c:1549 [inline]
      ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x98 kernel/workqueue.c:1600
      WARNING: CPU: 1 PID: 842 at lib/debugobjects.c:485 debug_print_object+0x180/0x240 lib/debugobjects.c:485
      Kernel panic - not syncing: panic_on_warn set ...
      CPU: 1 PID: 842 Comm: kworker/u4:4 Tainted: G S                5.9.0-rc8+ #96
      Hardware name: linux,dummy-virt (DT)
      Workqueue: netns cleanup_net
      Call trace:
       dump_backtrace+0x0/0x4d8 include/linux/bitmap.h:239
       show_stack+0x34/0x48 arch/arm64/kernel/traps.c:142
       __dump_stack lib/dump_stack.c:77 [inline]
       dump_stack+0x174/0x1f8 lib/dump_stack.c:118
       panic+0x360/0x7a0 kernel/panic.c:231
       __warn+0x244/0x2ec kernel/panic.c:600
       report_bug+0x240/0x398 lib/bug.c:198
       bug_handler+0x50/0xc0 arch/arm64/kernel/traps.c:974
       call_break_hook+0x160/0x1d8 arch/arm64/kernel/debug-monitors.c:322
       brk_handler+0x30/0xc0 arch/arm64/kernel/debug-monitors.c:329
       do_debug_exception+0x184/0x340 arch/arm64/mm/fault.c:864
       el1_dbg+0x48/0xb0 arch/arm64/kernel/entry-common.c:65
       el1_sync_handler+0x170/0x1c8 arch/arm64/kernel/entry-common.c:93
       el1_sync+0x80/0x100 arch/arm64/kernel/entry.S:594
       debug_print_object+0x180/0x240 lib/debugobjects.c:485
       __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
       debug_check_no_obj_freed+0x200/0x430 lib/debugobjects.c:998
       slab_free_hook mm/slub.c:1536 [inline]
       slab_free_freelist_hook+0x190/0x210 mm/slub.c:1577
       slab_free mm/slub.c:3138 [inline]
       kfree+0x13c/0x460 mm/slub.c:4119
       bond_free_slave+0x8c/0xf8 drivers/net/bonding/bond_main.c:1492
       __bond_release_one+0xe0c/0xec8 drivers/net/bonding/bond_main.c:2190
       bond_slave_netdev_event drivers/net/bonding/bond_main.c:3309 [inline]
       bond_netdev_event+0x8f0/0xa70 drivers/net/bonding/bond_main.c:3420
       notifier_call_chain+0xf0/0x200 kernel/notifier.c:83
       __raw_notifier_call_chain kernel/notifier.c:361 [inline]
       raw_notifier_call_chain+0x44/0x58 kernel/notifier.c:368
       call_netdevice_notifiers_info+0xbc/0x150 net/core/dev.c:2033
       call_netdevice_notifiers_extack net/core/dev.c:2045 [inline]
       call_netdevice_notifiers net/core/dev.c:2059 [inline]
       rollback_registered_many+0x6a4/0xec0 net/core/dev.c:9347
       unregister_netdevice_many.part.0+0x2c/0x1c0 net/core/dev.c:10509
       unregister_netdevice_many net/core/dev.c:10508 [inline]
       default_device_exit_batch+0x294/0x338 net/core/dev.c:10992
       ops_exit_list.isra.0+0xec/0x150 net/core/net_namespace.c:189
       cleanup_net+0x44c/0x888 net/core/net_namespace.c:603
       process_one_work+0x96c/0x18c0 kernel/workqueue.c:2269
       worker_thread+0x3f0/0xc30 kernel/workqueue.c:2415
       kthread+0x390/0x498 kernel/kthread.c:292
       ret_from_fork+0x10/0x18 arch/arm64/kernel/entry.S:925
    
    This is a potential use-after-free if the sysfs nodes are being accessed
    whilst removing the struct slave, so wait for the object destruction to
    complete before freeing the struct slave itself.
    
    Fixes: 07699f9a ("bonding: add sysfs /slave dir for bond slave devices.")
    Fixes: a068aab4 ("bonding: Fix reference count leak in bond_sysfs_slave_add.")
    Cc: Qiushi Wu <wu000273@umn.edu>
    Cc: Jay Vosburgh <j.vosburgh@gmail.com>
    Cc: Veaceslav Falico <vfalico@gmail.com>
    Cc: Andy Gospodarek <andy@greyhouse.net>
    Signed-off-by: NJamie Iles <jamie@nuviainc.com>
    Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    Link: https://lore.kernel.org/r/20201120142827.879226-1-jamie@nuviainc.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>
    b9ad3e9f
bond_main.c 147.7 KB