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1 // Copyright 2014 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 package cgotest
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6
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7 // Test that we have no more than one build ID. In the past we used
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8 // to generate a separate build ID for each package using cgo, and the
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9 // linker concatenated them all. We don't want that--we only want
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10 // one.
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11
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12 import (
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13 "bytes"
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14 "debug/elf"
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15 "os"
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16 "testing"
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17 )
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18
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19 func testBuildID(t *testing.T) {
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20 f, err := elf.Open("/proc/self/exe")
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21 if err != nil {
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22 if os.IsNotExist(err) {
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23 t.Skip("no /proc/self/exe")
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24 }
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25 t.Fatal("opening /proc/self/exe: ", err)
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26 }
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27 defer f.Close()
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28
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29 c := 0
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30 for i, s := range f.Sections {
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31 if s.Type != elf.SHT_NOTE {
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32 continue
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33 }
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34
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35 d, err := s.Data()
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36 if err != nil {
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37 t.Logf("reading data of note section %d: %v", i, err)
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38 continue
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39 }
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40
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41 for len(d) > 0 {
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42
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43 // ELF standards differ as to the sizes in
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44 // note sections. Both the GNU linker and
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45 // gold always generate 32-bit sizes, so that
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46 // is what we assume here.
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47
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48 if len(d) < 12 {
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49 t.Logf("note section %d too short (%d < 12)", i, len(d))
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50 continue
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51 }
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52
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53 namesz := f.ByteOrder.Uint32(d)
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54 descsz := f.ByteOrder.Uint32(d[4:])
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55 typ := f.ByteOrder.Uint32(d[8:])
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56
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57 an := (namesz + 3) &^ 3
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58 ad := (descsz + 3) &^ 3
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59
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60 if int(12+an+ad) > len(d) {
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61 t.Logf("note section %d too short for header (%d < 12 + align(%d,4) + align(%d,4))", i, len(d), namesz, descsz)
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62 continue
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63 }
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64
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65 // 3 == NT_GNU_BUILD_ID
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66 if typ == 3 && namesz == 4 && bytes.Equal(d[12:16], []byte("GNU\000")) {
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67 c++
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68 }
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69
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70 d = d[12+an+ad:]
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71 }
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72 }
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73
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74 if c > 1 {
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75 t.Errorf("found %d build ID notes", c)
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76 }
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77 }
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