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- // Copyright 2022 Google Inc. All rights reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- package main
- import (
- "bytes"
- "debug/elf"
- "encoding/binary"
- "reflect"
- "testing"
- )
- func Test_elfIdentifierFromReaderAt_BadElfFile(t *testing.T) {
- tests := []struct {
- name string
- contents string
- }{
- {
- name: "empty",
- contents: "",
- },
- {
- name: "text",
- contents: "#!/bin/bash\necho foobar",
- },
- {
- name: "empty elf",
- contents: emptyElfFile(),
- },
- {
- name: "short section header",
- contents: shortSectionHeaderElfFile(),
- },
- }
- for _, tt := range tests {
- t.Run(tt.name, func(t *testing.T) {
- buf := bytes.NewReader([]byte(tt.contents))
- _, err := elfIdentifierFromReaderAt(buf, "<>", false)
- if err == nil {
- t.Errorf("expected error reading bad elf file without allowMissing")
- }
- _, err = elfIdentifierFromReaderAt(buf, "<>", true)
- if err != nil {
- t.Errorf("expected no error reading bad elf file with allowMissing, got %q", err.Error())
- }
- })
- }
- }
- func Test_readNote(t *testing.T) {
- note := []byte{
- 0x04, 0x00, 0x00, 0x00,
- 0x10, 0x00, 0x00, 0x00,
- 0x03, 0x00, 0x00, 0x00,
- 0x47, 0x4e, 0x55, 0x00,
- 0xca, 0xaf, 0x44, 0xd2, 0x82, 0x78, 0x68, 0xfe, 0xc0, 0x90, 0xa3, 0x43, 0x85, 0x36, 0x6c, 0xc7,
- }
- descs, err := readNote(bytes.NewBuffer(note), binary.LittleEndian)
- if err != nil {
- t.Fatalf("unexpected error in readNote: %s", err)
- }
- expectedDescs := map[string][]byte{
- "GNU\x00": []byte{0xca, 0xaf, 0x44, 0xd2, 0x82, 0x78, 0x68, 0xfe, 0xc0, 0x90, 0xa3, 0x43, 0x85, 0x36, 0x6c, 0xc7},
- }
- if !reflect.DeepEqual(descs, expectedDescs) {
- t.Errorf("incorrect return, want %#v got %#v", expectedDescs, descs)
- }
- }
- // emptyElfFile returns an elf file header with no program headers or sections.
- func emptyElfFile() string {
- ident := [elf.EI_NIDENT]byte{}
- identBuf := bytes.NewBuffer(ident[0:0:elf.EI_NIDENT])
- binary.Write(identBuf, binary.LittleEndian, []byte("\x7fELF"))
- binary.Write(identBuf, binary.LittleEndian, elf.ELFCLASS64)
- binary.Write(identBuf, binary.LittleEndian, elf.ELFDATA2LSB)
- binary.Write(identBuf, binary.LittleEndian, elf.EV_CURRENT)
- binary.Write(identBuf, binary.LittleEndian, elf.ELFOSABI_LINUX)
- binary.Write(identBuf, binary.LittleEndian, make([]byte, 8))
- header := elf.Header64{
- Ident: ident,
- Type: uint16(elf.ET_EXEC),
- Machine: uint16(elf.EM_X86_64),
- Version: uint32(elf.EV_CURRENT),
- Entry: 0,
- Phoff: uint64(binary.Size(elf.Header64{})),
- Shoff: uint64(binary.Size(elf.Header64{})),
- Flags: 0,
- Ehsize: uint16(binary.Size(elf.Header64{})),
- Phentsize: 0x38,
- Phnum: 0,
- Shentsize: 0x40,
- Shnum: 0,
- Shstrndx: 0,
- }
- buf := &bytes.Buffer{}
- binary.Write(buf, binary.LittleEndian, header)
- return buf.String()
- }
- // shortSectionHeader returns an elf file header with a section header that extends past the end of
- // the file.
- func shortSectionHeaderElfFile() string {
- ident := [elf.EI_NIDENT]byte{}
- identBuf := bytes.NewBuffer(ident[0:0:elf.EI_NIDENT])
- binary.Write(identBuf, binary.LittleEndian, []byte("\x7fELF"))
- binary.Write(identBuf, binary.LittleEndian, elf.ELFCLASS64)
- binary.Write(identBuf, binary.LittleEndian, elf.ELFDATA2LSB)
- binary.Write(identBuf, binary.LittleEndian, elf.EV_CURRENT)
- binary.Write(identBuf, binary.LittleEndian, elf.ELFOSABI_LINUX)
- binary.Write(identBuf, binary.LittleEndian, make([]byte, 8))
- header := elf.Header64{
- Ident: ident,
- Type: uint16(elf.ET_EXEC),
- Machine: uint16(elf.EM_X86_64),
- Version: uint32(elf.EV_CURRENT),
- Entry: 0,
- Phoff: uint64(binary.Size(elf.Header64{})),
- Shoff: uint64(binary.Size(elf.Header64{})),
- Flags: 0,
- Ehsize: uint16(binary.Size(elf.Header64{})),
- Phentsize: 0x38,
- Phnum: 0,
- Shentsize: 0x40,
- Shnum: 1,
- Shstrndx: 0,
- }
- buf := &bytes.Buffer{}
- binary.Write(buf, binary.LittleEndian, header)
- binary.Write(buf, binary.LittleEndian, []byte{0})
- return buf.String()
- }
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