• Kirill Tkhai's avatar
    dm: fix use-after-free in dm_cleanup_zoned_dev() · 588b7f5d
    Kirill Tkhai authored
    dm_cleanup_zoned_dev() uses queue, so it must be called
    before blk_cleanup_disk() starts its killing:
    
    blk_cleanup_disk->blk_cleanup_queue()->kobject_put()->blk_release_queue()->
    ->...RCU...->blk_free_queue_rcu()->kmem_cache_free()
    
    Otherwise, RCU callback may be executed first and
    dm_cleanup_zoned_dev() will touch free'd memory:
    
     BUG: KASAN: use-after-free in dm_cleanup_zoned_dev+0x33/0xd0
     Read of size 8 at addr ffff88805ac6e430 by task dmsetup/681
    
     CPU: 4 PID: 681 Comm: dmsetup Not tainted 5.17.0-rc2+ #6
     Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
     Call Trace:
      <TASK>
      dump_stack_lvl+0x57/0x7d
      print_address_description.constprop.0+0x1f/0x150
      ? dm_cleanup_zoned_dev+0x33/0xd0
      kasan_report.cold+0x7f/0x11b
      ? dm_cleanup_zoned_dev+0x33/0xd0
      dm_cleanup_zoned_dev+0x33/0xd0
      __dm_destroy+0x26a/0x400
      ? dm_blk_ioctl+0x230/0x230
      ? up_write+0xd8/0x270
      dev_remove+0x156/0x1d0
      ctl_ioctl+0x269/0x530
      ? table_clear+0x140/0x140
      ? lock_release+0xb2/0x750
      ? remove_all+0x40/0x40
      ? rcu_read_lock_sched_held+0x12/0x70
      ? lock_downgrade+0x3c0/0x3c0
      ? rcu_read_lock_sched_held+0x12/0x70
      dm_ctl_ioctl+0xa/0x10
      __x64_sys_ioctl+0xb9/0xf0
      do_syscall_64+0x3b/0x90
      entry_SYSCALL_64_after_hwframe+0x44/0xae
     RIP: 0033:0x7fb6dfa95c27
    
    Fixes: bb37d772
    
     ("dm: introduce zone append emulation")
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarKirill Tkhai <ktkhai@virtuozzo.com>
    Reviewed-by: default avatarDamien Le Moal <damien.lemoal@opensource.wdc.com>
    Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    588b7f5d
dm.c 69.3 KB