linux-kernel - [PATCH] inode: debugfs_create_dir uses mode permission from parent

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Date:   Fri, 27 Apr 2018 10:07:12 +0200
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     gregkh@...uxfoundation.org
Cc:     brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, linux-kernel@...r.kernel.org,
        Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH] 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.

Fixes: edac65eaf8d5c ("debugfs: take mode-dependent parts of debugfs_get_inode() into callers")
Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/debugfs/inode.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 13b01351dd1c..80618330d86a 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -512,7 +512,10 @@ 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
+				   & (S_IRWXU | S_IRWXG));
 	inode->i_op = &simple_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
 
-- 
2.14.3