diff options
Diffstat (limited to 'pkg/sentry/vfs/file_description.go')
| -rw-r--r-- | pkg/sentry/vfs/file_description.go | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/pkg/sentry/vfs/file_description.go b/pkg/sentry/vfs/file_description.go index 576ab3920..d3c1197e3 100644 --- a/pkg/sentry/vfs/file_description.go +++ b/pkg/sentry/vfs/file_description.go @@ -356,6 +356,8 @@ type FileDescriptionImpl interface { // Allocate grows the file to offset + length bytes. // Only mode == 0 is supported currently. + // + // Preconditions: The FileDescription was opened for writing. Allocate(ctx context.Context, mode, offset, length uint64) error // waiter.Waitable methods may be used to poll for I/O events. @@ -565,6 +567,9 @@ func (fd *FileDescription) StatFS(ctx context.Context) (linux.Statfs, error) { // Allocate grows file represented by FileDescription to offset + length bytes. func (fd *FileDescription) Allocate(ctx context.Context, mode, offset, length uint64) error { + if !fd.IsWritable() { + return syserror.EBADF + } return fd.impl.Allocate(ctx, mode, offset, length) } |