• Thomas Richter's avatar
    debugfs: inode: debugfs_create_dir uses mode permission from parent · 95cde3c5
    Thomas Richter authored
    Currently function debugfs_create_dir() creates a new
    directory in the debugfs (usually mounted /sys/kernel/debug)
    with permission rwxr-xr-x. This is hard coded.
    
    Change this to use the parent directory permission.
    
    Output before the patch:
    root@s8360047 ~]# tree -dp -L 1 /sys/kernel/debug/
    /sys/kernel/debug/
    ├── [drwxr-xr-x]  bdi
    ├── [drwxr-xr-x]  block
    ├── [drwxr-xr-x]  dasd
    ├── [drwxr-xr-x]  device_component
    ├── [drwxr-xr-x]  extfrag
    ├── [drwxr-xr-x]  hid
    ├── [drwxr-xr-x]  kprobes
    ├── [drwxr-xr-x]  kvm
    ├── [drwxr-xr-x]  memblock
    ├── [drwxr-xr-x]  pm_qos
    ├── [drwxr-xr-x]  qdio
    ├── [drwxr-xr-x]  s390
    ├── [drwxr-xr-x]  s390dbf
    └── [drwx------]  tracing
    
    14 directories
    [root@s8360047 linux]#
    
    Output after the patch:
    [root@s8360047 ~]# tree -dp -L 1 /sys/kernel/debug/
    sys/kernel/debug/
    ├── [drwx------]  bdi
    ├── [drwx------]  block
    ├── [drwx------]  dasd
    ├── [drwx------]  device_component
    ├── [drwx------]  extfrag
    ├── [drwx------]  hid
    ├── [drwx------]  kprobes
    ├── [drwx------]  kvm
    ├── [drwx------]  memblock
    ├── [drwx------]  pm_qos
    ├── [drwx------]  qdio
    ├── [drwx------]  s390
    ├── [drwx------]  s390dbf
    └── [drwx------]  tracing
    
    14 directories
    [root@s8360047 linux]#
    
    Here is the full diff output done with:
    [root@s8360047 ~]# diff -u treefull.before treefull.after |
    	sed 's-^- # -' > treefull.diff
     # --- treefull.before	2018-04-27 13:22:04.532824564 +0200
     # +++ treefull.after	2018-04-27 13:24:12.106182062 +0200
     # @@ -1,55 +1,55 @@
     #  /sys/kernel/debug/
     # -├── [drwxr-xr-x]  bdi
     # -│   ├── [drwxr-xr-x]  1:0
     # -│   ├── [drwxr-xr-x]  1:1
     # -│   ├── [drwxr-xr-x]  1:10
     # -│   ├── [drwxr-xr-x]  1:11
     # -│   ├── [drwxr-xr-x]  1:12
     # -│   ├── [drwxr-xr-x]  1:13
     # -│   ├── [drwxr-xr-x]  1:14
     # -│   ├── [drwxr-xr-x]  1:15
     # -│   ├── [drwxr-xr-x]  1:2
     # -│   ├── [drwxr-xr-x]  1:3
     # -│   ├── [drwxr-xr-x]  1:4
     # -│   ├── [drwxr-xr-x]  1:5
     # -│   ├── [drwxr-xr-x]  1:6
     # -│   ├── [drwxr-xr-x]  1:7
     # -│   ├── [drwxr-xr-x]  1:8
     # -│   ├── [drwxr-xr-x]  1:9
     # -│   └── [drwxr-xr-x]  94:0
     # -├── [drwxr-xr-x]  block
     # -├── [drwxr-xr-x]  dasd
     # -│   ├── [drwxr-xr-x]  0.0.e18a
     # -│   ├── [drwxr-xr-x]  dasda
     # -│   └── [drwxr-xr-x]  global
     # -├── [drwxr-xr-x]  device_component
     # -├── [drwxr-xr-x]  extfrag
     # -├── [drwxr-xr-x]  hid
     # -├── [drwxr-xr-x]  kprobes
     # -├── [drwxr-xr-x]  kvm
     # -├── [drwxr-xr-x]  memblock
     # -├── [drwxr-xr-x]  pm_qos
     # -├── [drwxr-xr-x]  qdio
     # -│   └── [drwxr-xr-x]  0.0.f5f2
     # -├── [drwxr-xr-x]  s390
     # -│   └── [drwxr-xr-x]  stsi
     # -├── [drwxr-xr-x]  s390dbf
     # -│   ├── [drwxr-xr-x]  0.0.e18a
     # -│   ├── [drwxr-xr-x]  cio_crw
     # -│   ├── [drwxr-xr-x]  cio_msg
     # -│   ├── [drwxr-xr-x]  cio_trace
     # -│   ├── [drwxr-xr-x]  dasd
     # -│   ├── [drwxr-xr-x]  kvm-trace
     # -│   ├── [drwxr-xr-x]  lgr
     # -│   ├── [drwxr-xr-x]  qdio_0.0.f5f2
     # -│   ├── [drwxr-xr-x]  qdio_error
     # -│   ├── [drwxr-xr-x]  qdio_setup
     # -│   ├── [drwxr-xr-x]  qeth_card_0.0.f5f0
     # -│   ├── [drwxr-xr-x]  qeth_control
     # -│   ├── [drwxr-xr-x]  qeth_msg
     # -│   ├── [drwxr-xr-x]  qeth_setup
     # -│   ├── [drwxr-xr-x]  vmcp
     # -│   └── [drwxr-xr-x]  vmur
     # +├── [drwx------]  bdi
     # +│   ├── [drwx------]  1:0
     # +│   ├── [drwx------]  1:1
     # +│   ├── [drwx------]  1:10
     # +│   ├── [drwx------]  1:11
     # +│   ├── [drwx------]  1:12
     # +│   ├── [drwx------]  1:13
     # +│   ├── [drwx------]  1:14
     # +│   ├── [drwx------]  1:15
     # +│   ├── [drwx------]  1:2
     # +│   ├── [drwx------]  1:3
     # +│   ├── [drwx------]  1:4
     # +│   ├── [drwx------]  1:5
     # +│   ├── [drwx------]  1:6
     # +│   ├── [drwx------]  1:7
     # +│   ├── [drwx------]  1:8
     # +│   ├── [drwx------]  1:9
     # +│   └── [drwx------]  94:0
     # +├── [drwx------]  block
     # +├── [drwx------]  dasd
     # +│   ├── [drwx------]  0.0.e18a
     # +│   ├── [drwx------]  dasda
     # +│   └── [drwx------]  global
     # +├── [drwx------]  device_component
     # +├── [drwx------]  extfrag
     # +├── [drwx------]  hid
     # +├── [drwx------]  kprobes
     # +├── [drwx------]  kvm
     # +├── [drwx------]  memblock
     # +├── [drwx------]  pm_qos
     # +├── [drwx------]  qdio
     # +│   └── [drwx------]  0.0.f5f2
     # +├── [drwx------]  s390
     # +│   └── [drwx------]  stsi
     # +├── [drwx------]  s390dbf
     # +│   ├── [drwx------]  0.0.e18a
     # +│   ├── [drwx------]  cio_crw
     # +│   ├── [drwx------]  cio_msg
     # +│   ├── [drwx------]  cio_trace
     # +│   ├── [drwx------]  dasd
     # +│   ├── [drwx------]  kvm-trace
     # +│   ├── [drwx------]  lgr
     # +│   ├── [drwx------]  qdio_0.0.f5f2
     # +│   ├── [drwx------]  qdio_error
     # +│   ├── [drwx------]  qdio_setup
     # +│   ├── [drwx------]  qeth_card_0.0.f5f0
     # +│   ├── [drwx------]  qeth_control
     # +│   ├── [drwx------]  qeth_msg
     # +│   ├── [drwx------]  qeth_setup
     # +│   ├── [drwx------]  vmcp
     # +│   └── [drwx------]  vmur
     #  └── [drwx------]  tracing
     #      ├── [drwxr-xr-x]  events
     #      │   ├── [drwxr-xr-x]  alarmtimer
    
    Fixes: edac65ea ("debugfs: take mode-dependent parts of debugfs_get_inode() into callers")
    Signed-off-by: default avatarThomas Richter <tmricht@linux.ibm.com>
    Reviewed-by: default avatarKees Cook <keescook@chromium.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    95cde3c5
inode.c 24.3 KB