github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/p9/buffer_test.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package p9
    16  
    17  import (
    18  	"testing"
    19  )
    20  
    21  func TestBufferOverrun(t *testing.T) {
    22  	buf := &buffer{
    23  		// This header indicates that a large string should follow, but
    24  		// it is only two bytes. Reading a string should cause an
    25  		// overrun.
    26  		data: []byte{0x0, 0x16},
    27  	}
    28  	if s := buf.ReadString(); s != "" {
    29  		t.Errorf("overrun read got %s, want empty", s)
    30  	}
    31  }