diff options
Diffstat (limited to 'fs/ecryptfs/file.c')
| -rw-r--r-- | fs/ecryptfs/file.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index d3f95f941c4..a2a97cb614d 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -151,7 +151,15 @@ static const struct vm_operations_struct ecryptfs_file_vm_ops = { static int ecryptfs_file_mmap(struct file *file, struct vm_area_struct *vma) { + struct file *lower_file = ecryptfs_file_to_lower(file); int rc; + /* + * Don't allow mmap on top of file systems that don't support it + * natively. If FILESYSTEM_MAX_STACK_DEPTH > 2 or ecryptfs + * allows recursive mounting, this will need to be extended. + */ + if (!lower_file->f_op->mmap) + return -ENODEV; rc = generic_file_mmap(file, vma); if (!rc) |