Prevent ecryptfs from being mounted on top of idmapped mounts until we
have ported it to handle this case and added proper testing for it.
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
---
/* v2 */
patch introduced
/* v3 */
- David Howells <dhowells@xxxxxxxxxx>:
- Adapt check after removing mnt_idmapped() helper.
/* v4 */
unchanged
/* v5 */
base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837
- Christoph Hellwig <hch@xxxxxx>:
- Use new file_userns_helper().
---
fs/ecryptfs/main.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index e63259fdef28..cdf40a54a35d 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -531,6 +531,12 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
goto out_free;
}
+ if (mnt_user_ns(path.mnt) != &init_user_ns) {
+ rc = -EINVAL;
+ printk(KERN_ERR "Mounting on idmapped mounts currently disallowed\n");
+ goto out_free;
+ }
+
if (check_ruid && !uid_eq(d_inode(path.dentry)->i_uid, current_uid())) {
rc = -EPERM;
printk(KERN_ERR "Mount of device (uid: %d) not owned by "
--
2.30.0
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