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79 lines
1.7 KiB
79 lines
1.7 KiB
4 months ago
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package cgotest
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// Test that we have no more than one build ID. In the past we used
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// to generate a separate build ID for each package using cgo, and the
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// linker concatenated them all. We don't want that--we only want
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// one.
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import (
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"bytes"
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"debug/elf"
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"os"
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"testing"
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)
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func testBuildID(t *testing.T) {
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f, err := elf.Open("/proc/self/exe")
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if err != nil {
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if os.IsNotExist(err) {
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t.Skip("no /proc/self/exe")
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}
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t.Fatal("opening /proc/self/exe: ", err)
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}
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defer f.Close()
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c := 0
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sections:
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for i, s := range f.Sections {
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if s.Type != elf.SHT_NOTE {
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continue
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}
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d, err := s.Data()
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if err != nil {
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t.Logf("reading data of note section %d: %v", i, err)
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continue
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}
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for len(d) > 0 {
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// ELF standards differ as to the sizes in
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// note sections. Both the GNU linker and
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// gold always generate 32-bit sizes, so that
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// is what we assume here.
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if len(d) < 12 {
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t.Logf("note section %d too short (%d < 12)", i, len(d))
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continue sections
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}
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namesz := f.ByteOrder.Uint32(d)
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descsz := f.ByteOrder.Uint32(d[4:])
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typ := f.ByteOrder.Uint32(d[8:])
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an := (namesz + 3) &^ 3
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ad := (descsz + 3) &^ 3
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if int(12+an+ad) > len(d) {
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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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continue sections
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}
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// 3 == NT_GNU_BUILD_ID
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if typ == 3 && namesz == 4 && bytes.Equal(d[12:16], []byte("GNU\000")) {
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c++
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}
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d = d[12+an+ad:]
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}
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}
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if c > 1 {
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t.Errorf("found %d build ID notes", c)
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}
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}
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