Merge release-20200323.0-74-gf332a86 (automated)

1 files changed, 7 insertions, 0 deletions

diff --git a/pkg/sentry/vfs/file_description.go b/pkg/sentry/vfs/file_description.go
index 28e93a441..20c545fca 100755
--- a/pkg/sentry/vfs/file_description.go
+++ b/pkg/sentry/vfs/file_description.go
@@ -91,6 +91,10 @@ type FileDescriptionOptions struct {
 	// ESPIPE.
 	DenyPWrite bool
 
+	// if InvalidWrite is true, calls to FileDescription.Write() return
+	// EINVAL.
+	InvalidWrite bool
+
 	// If UseDentryMetadata is true, calls to FileDescription methods that
 	// interact with file and filesystem metadata (Stat, SetStat, StatFS,
 	// Listxattr, Getxattr, Setxattr, Removexattr) are implemented by calling
@@ -562,6 +566,9 @@ func (fd *FileDescription) PWrite(ctx context.Context, src usermem.IOSequence, o
 
 // Write is similar to PWrite, but does not specify an offset.
 func (fd *FileDescription) Write(ctx context.Context, src usermem.IOSequence, opts WriteOptions) (int64, error) {
+	if fd.opts.InvalidWrite {
+		return 0, syserror.EINVAL
+	}
 	if !fd.writable {
 		return 0, syserror.EBADF
 	}