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-rw-r--r--fs/ecryptfs/main.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 7d3ed6b..cbd4e18 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -483,6 +483,7 @@ out:
}
struct kmem_cache *ecryptfs_sb_info_cache;
+static struct file_system_type ecryptfs_fs_type;
/**
* ecryptfs_read_super
@@ -503,6 +504,13 @@ static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
goto out;
}
+ if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
+ rc = -EINVAL;
+ printk(KERN_ERR "Mount on filesystem of type "
+ "eCryptfs explicitly disallowed due to "
+ "known incompatibilities\n");
+ goto out_free;
+ }
ecryptfs_set_superblock_lower(sb, path.dentry->d_sb);
sb->s_maxbytes = path.dentry->d_sb->s_maxbytes;
sb->s_blocksize = path.dentry->d_sb->s_blocksize;
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