diff mbox series

[RFC,v9,04/16] security: add new securityfs delete function

Message ID 1675119451-23180-5-git-send-email-wufan@linux.microsoft.com (mailing list archive)
State New, archived
Headers show
Series Integrity Policy Enforcement LSM (IPE) | expand

Commit Message

Fan Wu Jan. 30, 2023, 10:57 p.m. UTC
When deleting a directory in the security file system, the existing
securityfs_remove requires the directory to be empty, otherwise
it will do nothing. This leads to a potential risk that the security
file system might be in an unclean state when the intentded deletion
did not happen.

This commit introduces a new function securityfs_recursive_remove
to recursively delete a directory without leaving an unclean state.

Co-developed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Fan Wu <wufan@linux.microsoft.com>

  + Not present
 include/linux/security.h |  1 +
 security/inode.c         | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)
diff mbox series


diff --git a/include/linux/security.h b/include/linux/security.h
index 5b67f208f7de..479e154a12b8 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1985,6 +1985,7 @@  struct dentry *securityfs_create_symlink(const char *name,
 					 const char *target,
 					 const struct inode_operations *iops);
 extern void securityfs_remove(struct dentry *dentry);
+extern void securityfs_recursive_remove(struct dentry *dentry);
diff --git a/security/inode.c b/security/inode.c
index 6c326939750d..13358e8547e8 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -313,6 +313,31 @@  void securityfs_remove(struct dentry *dentry)
+static void remove_one(struct dentry *victim)
+	simple_release_fs(&mount, &mount_count);
+ * securityfs_recursive_remove - recursively removes a file or directory from the securityfs filesystem
+ *
+ * @dentry: a pointer to a the dentry of the file or directory to be removed.
+ *
+ * This function recursively removes a file or directory in securityfs that was
+ * previously created with a call to another securityfs function (like
+ * securityfs_create_file() or variants thereof.)
+ */
+void securityfs_recursive_remove(struct dentry *dentry)
+	if (IS_ERR_OR_NULL(dentry))
+		return;
+	simple_pin_fs(&fs_type, &mount, &mount_count);
+	simple_recursive_removal(dentry, remove_one);
+	simple_release_fs(&mount, &mount_count);
 static struct dentry *lsm_dentry;
 static ssize_t lsm_read(struct file *filp, char __user *buf, size_t count,