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    • T
      hsr: fix slab-out-of-bounds Read in hsr_debugfs_rename() · 04b69426
      Taehee Yoo 提交于
      hsr slave interfaces don't have debugfs directory.
      So, hsr_debugfs_rename() shouldn't be called when hsr slave interface name
      is changed.
      
      Test commands:
          ip link add dummy0 type dummy
          ip link add dummy1 type dummy
          ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1
          ip link set dummy0 name ap
      
      Splat looks like:
      [21071.899367][T22666] ap: renamed from dummy0
      [21071.914005][T22666] ==================================================================
      [21071.919008][T22666] BUG: KASAN: slab-out-of-bounds in hsr_debugfs_rename+0xaa/0xb0 [hsr]
      [21071.923640][T22666] Read of size 8 at addr ffff88805febcd98 by task ip/22666
      [21071.926941][T22666]
      [21071.927750][T22666] CPU: 0 PID: 22666 Comm: ip Not tainted 5.5.0-rc2+ #240
      [21071.929919][T22666] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
      [21071.935094][T22666] Call Trace:
      [21071.935867][T22666]  dump_stack+0x96/0xdb
      [21071.936687][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
      [21071.937774][T22666]  print_address_description.constprop.5+0x1be/0x360
      [21071.939019][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
      [21071.940081][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
      [21071.940949][T22666]  __kasan_report+0x12a/0x16f
      [21071.941758][T22666]  ? hsr_debugfs_rename+0xaa/0xb0 [hsr]
      [21071.942674][T22666]  kasan_report+0xe/0x20
      [21071.943325][T22666]  hsr_debugfs_rename+0xaa/0xb0 [hsr]
      [21071.944187][T22666]  hsr_netdev_notify+0x1fe/0x9b0 [hsr]
      [21071.945052][T22666]  ? __module_text_address+0x13/0x140
      [21071.945897][T22666]  notifier_call_chain+0x90/0x160
      [21071.946743][T22666]  dev_change_name+0x419/0x840
      [21071.947496][T22666]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
      [21071.948600][T22666]  ? netdev_adjacent_rename_links+0x280/0x280
      [21071.949577][T22666]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
      [21071.950672][T22666]  ? lock_downgrade+0x6e0/0x6e0
      [21071.951345][T22666]  ? do_setlink+0x811/0x2ef0
      [21071.951991][T22666]  do_setlink+0x811/0x2ef0
      [21071.952613][T22666]  ? is_bpf_text_address+0x81/0xe0
      [ ... ]
      
      Reported-by: syzbot+9328206518f08318a5fd@syzkaller.appspotmail.com
      Fixes: 4c2d5e33 ("hsr: rename debugfs file when interface name is changed")
      Signed-off-by: NTaehee Yoo <ap420073@gmail.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      04b69426