[PATCH] eCryptfs: Encrypted passthrough

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / fs / ecryptfs / file.c

diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index f22c3a7..652ed77 100644 (file)
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -250,6 +250,17 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
        struct ecryptfs_file_info *file_info;
        int lower_flags;
 
+       mount_crypt_stat = &ecryptfs_superblock_to_private(
+               ecryptfs_dentry->d_sb)->mount_crypt_stat;
+       if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
+           && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
+               || (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
+               || (file->f_flags & O_APPEND))) {
+               printk(KERN_WARNING "Mount has encrypted view enabled; "
+                      "files may only be read\n");
+               rc = -EPERM;
+               goto out;
+       }
        /* Released in ecryptfs_release or end of function if failure */
        file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
        ecryptfs_set_file_private(file, file_info);
@@ -261,8 +272,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
        }
        lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
        crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
-       mount_crypt_stat = &ecryptfs_superblock_to_private(
-               ecryptfs_dentry->d_sb)->mount_crypt_stat;
        mutex_lock(&crypt_stat->cs_mutex);
        if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) {
                ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");