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authorThomas Richter <tmricht@linux.ibm.com>2018-04-27 14:35:47 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-14 16:48:18 +0200
commit95cde3c59966f6371b6bcd9e4e2da2ba64ee9775 (patch)
tree5188d82612f843704242af5fa7bf6fc2b675c7a9
parent964f8363a1aba6cb4198bfaaac538b08f1c538f1 (diff)
debugfs: inode: debugfs_create_dir uses mode permission from parent
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: edac65eaf8d5c ("debugfs: take mode-dependent parts of debugfs_get_inode() into callers") Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/debugfs/inode.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 13b01351dd1c..a913b12fc7f8 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -512,7 +512,9 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
if (unlikely(!inode))
return failed_creating(dentry);
- inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
+ if (!parent)
+ parent = debugfs_mount->mnt_root;
+ inode->i_mode = S_IFDIR | ((d_inode(parent)->i_mode & 0770));
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;