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-rw-r--r--src/cmd/internal/buildid/buildid.go343
-rw-r--r--src/cmd/internal/buildid/buildid_test.go179
-rw-r--r--src/cmd/internal/buildid/note.go208
-rw-r--r--src/cmd/internal/buildid/rewrite.go162
-rw-r--r--src/cmd/internal/buildid/testdata/a.elf.base641
-rw-r--r--src/cmd/internal/buildid/testdata/a.macho.base641
-rw-r--r--src/cmd/internal/buildid/testdata/a.pe.base641
-rw-r--r--src/cmd/internal/buildid/testdata/p.a.base641
8 files changed, 896 insertions, 0 deletions
diff --git a/src/cmd/internal/buildid/buildid.go b/src/cmd/internal/buildid/buildid.go
new file mode 100644
index 0000000..1e8855d
--- /dev/null
+++ b/src/cmd/internal/buildid/buildid.go
@@ -0,0 +1,343 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buildid
+
+import (
+ "bytes"
+ "debug/elf"
+ "fmt"
+ "internal/xcoff"
+ "io"
+ "io/fs"
+ "os"
+ "strconv"
+ "strings"
+)
+
+var (
+ errBuildIDMalformed = fmt.Errorf("malformed object file")
+
+ bangArch = []byte("!<arch>")
+ pkgdef = []byte("__.PKGDEF")
+ goobject = []byte("go object ")
+ buildid = []byte("build id ")
+)
+
+// ReadFile reads the build ID from an archive or executable file.
+func ReadFile(name string) (id string, err error) {
+ f, err := os.Open(name)
+ if err != nil {
+ return "", err
+ }
+ defer f.Close()
+
+ buf := make([]byte, 8)
+ if _, err := f.ReadAt(buf, 0); err != nil {
+ return "", err
+ }
+ if string(buf) != "!<arch>\n" {
+ if string(buf) == "<bigaf>\n" {
+ return readGccgoBigArchive(name, f)
+ }
+ return readBinary(name, f)
+ }
+
+ // Read just enough of the target to fetch the build ID.
+ // The archive is expected to look like:
+ //
+ // !<arch>
+ // __.PKGDEF 0 0 0 644 7955 `
+ // go object darwin amd64 devel X:none
+ // build id "b41e5c45250e25c9fd5e9f9a1de7857ea0d41224"
+ //
+ // The variable-sized strings are GOOS, GOARCH, and the experiment list (X:none).
+ // Reading the first 1024 bytes should be plenty.
+ data := make([]byte, 1024)
+ n, err := io.ReadFull(f, data)
+ if err != nil && n == 0 {
+ return "", err
+ }
+
+ tryGccgo := func() (string, error) {
+ return readGccgoArchive(name, f)
+ }
+
+ // Archive header.
+ for i := 0; ; i++ { // returns during i==3
+ j := bytes.IndexByte(data, '\n')
+ if j < 0 {
+ return tryGccgo()
+ }
+ line := data[:j]
+ data = data[j+1:]
+ switch i {
+ case 0:
+ if !bytes.Equal(line, bangArch) {
+ return tryGccgo()
+ }
+ case 1:
+ if !bytes.HasPrefix(line, pkgdef) {
+ return tryGccgo()
+ }
+ case 2:
+ if !bytes.HasPrefix(line, goobject) {
+ return tryGccgo()
+ }
+ case 3:
+ if !bytes.HasPrefix(line, buildid) {
+ // Found the object header, just doesn't have a build id line.
+ // Treat as successful, with empty build id.
+ return "", nil
+ }
+ id, err := strconv.Unquote(string(line[len(buildid):]))
+ if err != nil {
+ return tryGccgo()
+ }
+ return id, nil
+ }
+ }
+}
+
+// readGccgoArchive tries to parse the archive as a standard Unix
+// archive file, and fetch the build ID from the _buildid.o entry.
+// The _buildid.o entry is written by (*Builder).gccgoBuildIDELFFile
+// in cmd/go/internal/work/exec.go.
+func readGccgoArchive(name string, f *os.File) (string, error) {
+ bad := func() (string, error) {
+ return "", &fs.PathError{Op: "parse", Path: name, Err: errBuildIDMalformed}
+ }
+
+ off := int64(8)
+ for {
+ if _, err := f.Seek(off, io.SeekStart); err != nil {
+ return "", err
+ }
+
+ // TODO(iant): Make a debug/ar package, and use it
+ // here and in cmd/link.
+ var hdr [60]byte
+ if _, err := io.ReadFull(f, hdr[:]); err != nil {
+ if err == io.EOF {
+ // No more entries, no build ID.
+ return "", nil
+ }
+ return "", err
+ }
+ off += 60
+
+ sizeStr := strings.TrimSpace(string(hdr[48:58]))
+ size, err := strconv.ParseInt(sizeStr, 0, 64)
+ if err != nil {
+ return bad()
+ }
+
+ name := strings.TrimSpace(string(hdr[:16]))
+ if name == "_buildid.o/" {
+ sr := io.NewSectionReader(f, off, size)
+ e, err := elf.NewFile(sr)
+ if err != nil {
+ return bad()
+ }
+ s := e.Section(".go.buildid")
+ if s == nil {
+ return bad()
+ }
+ data, err := s.Data()
+ if err != nil {
+ return bad()
+ }
+ return string(data), nil
+ }
+
+ off += size
+ if off&1 != 0 {
+ off++
+ }
+ }
+}
+
+// readGccgoBigArchive tries to parse the archive as an AIX big
+// archive file, and fetch the build ID from the _buildid.o entry.
+// The _buildid.o entry is written by (*Builder).gccgoBuildIDXCOFFFile
+// in cmd/go/internal/work/exec.go.
+func readGccgoBigArchive(name string, f *os.File) (string, error) {
+ bad := func() (string, error) {
+ return "", &fs.PathError{Op: "parse", Path: name, Err: errBuildIDMalformed}
+ }
+
+ // Read fixed-length header.
+ if _, err := f.Seek(0, io.SeekStart); err != nil {
+ return "", err
+ }
+ var flhdr [128]byte
+ if _, err := io.ReadFull(f, flhdr[:]); err != nil {
+ return "", err
+ }
+ // Read first member offset.
+ offStr := strings.TrimSpace(string(flhdr[68:88]))
+ off, err := strconv.ParseInt(offStr, 10, 64)
+ if err != nil {
+ return bad()
+ }
+ for {
+ if off == 0 {
+ // No more entries, no build ID.
+ return "", nil
+ }
+ if _, err := f.Seek(off, io.SeekStart); err != nil {
+ return "", err
+ }
+ // Read member header.
+ var hdr [112]byte
+ if _, err := io.ReadFull(f, hdr[:]); err != nil {
+ return "", err
+ }
+ // Read member name length.
+ namLenStr := strings.TrimSpace(string(hdr[108:112]))
+ namLen, err := strconv.ParseInt(namLenStr, 10, 32)
+ if err != nil {
+ return bad()
+ }
+ if namLen == 10 {
+ var nam [10]byte
+ if _, err := io.ReadFull(f, nam[:]); err != nil {
+ return "", err
+ }
+ if string(nam[:]) == "_buildid.o" {
+ sizeStr := strings.TrimSpace(string(hdr[0:20]))
+ size, err := strconv.ParseInt(sizeStr, 10, 64)
+ if err != nil {
+ return bad()
+ }
+ off += int64(len(hdr)) + namLen + 2
+ if off&1 != 0 {
+ off++
+ }
+ sr := io.NewSectionReader(f, off, size)
+ x, err := xcoff.NewFile(sr)
+ if err != nil {
+ return bad()
+ }
+ data := x.CSect(".go.buildid")
+ if data == nil {
+ return bad()
+ }
+ return string(data), nil
+ }
+ }
+
+ // Read next member offset.
+ offStr = strings.TrimSpace(string(hdr[20:40]))
+ off, err = strconv.ParseInt(offStr, 10, 64)
+ if err != nil {
+ return bad()
+ }
+ }
+}
+
+var (
+ goBuildPrefix = []byte("\xff Go build ID: \"")
+ goBuildEnd = []byte("\"\n \xff")
+
+ elfPrefix = []byte("\x7fELF")
+
+ machoPrefixes = [][]byte{
+ {0xfe, 0xed, 0xfa, 0xce},
+ {0xfe, 0xed, 0xfa, 0xcf},
+ {0xce, 0xfa, 0xed, 0xfe},
+ {0xcf, 0xfa, 0xed, 0xfe},
+ }
+)
+
+var readSize = 32 * 1024 // changed for testing
+
+// readBinary reads the build ID from a binary.
+//
+// ELF binaries store the build ID in a proper PT_NOTE section.
+//
+// Other binary formats are not so flexible. For those, the linker
+// stores the build ID as non-instruction bytes at the very beginning
+// of the text segment, which should appear near the beginning
+// of the file. This is clumsy but fairly portable. Custom locations
+// can be added for other binary types as needed, like we did for ELF.
+func readBinary(name string, f *os.File) (id string, err error) {
+ // Read the first 32 kB of the binary file.
+ // That should be enough to find the build ID.
+ // In ELF files, the build ID is in the leading headers,
+ // which are typically less than 4 kB, not to mention 32 kB.
+ // In Mach-O files, there's no limit, so we have to parse the file.
+ // On other systems, we're trying to read enough that
+ // we get the beginning of the text segment in the read.
+ // The offset where the text segment begins in a hello
+ // world compiled for each different object format today:
+ //
+ // Plan 9: 0x20
+ // Windows: 0x600
+ //
+ data := make([]byte, readSize)
+ _, err = io.ReadFull(f, data)
+ if err == io.ErrUnexpectedEOF {
+ err = nil
+ }
+ if err != nil {
+ return "", err
+ }
+
+ if bytes.HasPrefix(data, elfPrefix) {
+ return readELF(name, f, data)
+ }
+ for _, m := range machoPrefixes {
+ if bytes.HasPrefix(data, m) {
+ return readMacho(name, f, data)
+ }
+ }
+ return readRaw(name, data)
+}
+
+// readRaw finds the raw build ID stored in text segment data.
+func readRaw(name string, data []byte) (id string, err error) {
+ i := bytes.Index(data, goBuildPrefix)
+ if i < 0 {
+ // Missing. Treat as successful but build ID empty.
+ return "", nil
+ }
+
+ j := bytes.Index(data[i+len(goBuildPrefix):], goBuildEnd)
+ if j < 0 {
+ return "", &fs.PathError{Op: "parse", Path: name, Err: errBuildIDMalformed}
+ }
+
+ quoted := data[i+len(goBuildPrefix)-1 : i+len(goBuildPrefix)+j+1]
+ id, err = strconv.Unquote(string(quoted))
+ if err != nil {
+ return "", &fs.PathError{Op: "parse", Path: name, Err: errBuildIDMalformed}
+ }
+ return id, nil
+}
+
+// HashToString converts the hash h to a string to be recorded
+// in package archives and binaries as part of the build ID.
+// We use the first 120 bits of the hash (5 chunks of 24 bits each) and encode
+// it in base64, resulting in a 20-byte string. Because this is only used for
+// detecting the need to rebuild installed files (not for lookups
+// in the object file cache), 120 bits are sufficient to drive the
+// probability of a false "do not need to rebuild" decision to effectively zero.
+// We embed two different hashes in archives and four in binaries,
+// so cutting to 20 bytes is a significant savings when build IDs are displayed.
+// (20*4+3 = 83 bytes compared to 64*4+3 = 259 bytes for the
+// more straightforward option of printing the entire h in base64).
+func HashToString(h [32]byte) string {
+ const b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+ const chunks = 5
+ var dst [chunks * 4]byte
+ for i := 0; i < chunks; i++ {
+ v := uint32(h[3*i])<<16 | uint32(h[3*i+1])<<8 | uint32(h[3*i+2])
+ dst[4*i+0] = b64[(v>>18)&0x3F]
+ dst[4*i+1] = b64[(v>>12)&0x3F]
+ dst[4*i+2] = b64[(v>>6)&0x3F]
+ dst[4*i+3] = b64[v&0x3F]
+ }
+ return string(dst[:])
+}
diff --git a/src/cmd/internal/buildid/buildid_test.go b/src/cmd/internal/buildid/buildid_test.go
new file mode 100644
index 0000000..e832f99
--- /dev/null
+++ b/src/cmd/internal/buildid/buildid_test.go
@@ -0,0 +1,179 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buildid
+
+import (
+ "bytes"
+ "crypto/sha256"
+ "internal/obscuretestdata"
+ "io/ioutil"
+ "os"
+ "reflect"
+ "strings"
+ "testing"
+)
+
+const (
+ expectedID = "abcdefghijklmnopqrstuvwxyz.1234567890123456789012345678901234567890123456789012345678901234"
+ newID = "bcdefghijklmnopqrstuvwxyza.2345678901234567890123456789012345678901234567890123456789012341"
+)
+
+func TestReadFile(t *testing.T) {
+ f, err := ioutil.TempFile("", "buildid-test-")
+ if err != nil {
+ t.Fatal(err)
+ }
+ tmp := f.Name()
+ defer os.Remove(tmp)
+ f.Close()
+
+ // Use obscured files to prevent Appleā€™s notarization service from
+ // mistaking them as candidates for notarization and rejecting the entire
+ // toolchain.
+ // See golang.org/issue/34986
+ var files = []string{
+ "p.a.base64",
+ "a.elf.base64",
+ "a.macho.base64",
+ "a.pe.base64",
+ }
+
+ for _, name := range files {
+ f, err := obscuretestdata.DecodeToTempFile("testdata/" + name)
+ if err != nil {
+ t.Errorf("obscuretestdata.DecodeToTempFile(testdata/%s): %v", name, err)
+ continue
+ }
+ defer os.Remove(f)
+ id, err := ReadFile(f)
+ if id != expectedID || err != nil {
+ t.Errorf("ReadFile(testdata/%s) = %q, %v, want %q, nil", f, id, err, expectedID)
+ }
+ old := readSize
+ readSize = 2048
+ id, err = ReadFile(f)
+ readSize = old
+ if id != expectedID || err != nil {
+ t.Errorf("ReadFile(%s) [readSize=2k] = %q, %v, want %q, nil", f, id, err, expectedID)
+ }
+
+ data, err := ioutil.ReadFile(f)
+ if err != nil {
+ t.Fatal(err)
+ }
+ m, _, err := FindAndHash(bytes.NewReader(data), expectedID, 1024)
+ if err != nil {
+ t.Errorf("FindAndHash(%s): %v", f, err)
+ continue
+ }
+ if err := ioutil.WriteFile(tmp, data, 0666); err != nil {
+ t.Error(err)
+ continue
+ }
+ tf, err := os.OpenFile(tmp, os.O_WRONLY, 0)
+ if err != nil {
+ t.Error(err)
+ continue
+ }
+ err = Rewrite(tf, m, newID)
+ err2 := tf.Close()
+ if err != nil {
+ t.Errorf("Rewrite(%s): %v", f, err)
+ continue
+ }
+ if err2 != nil {
+ t.Fatal(err2)
+ }
+
+ id, err = ReadFile(tmp)
+ if id != newID || err != nil {
+ t.Errorf("ReadFile(%s after Rewrite) = %q, %v, want %q, nil", f, id, err, newID)
+ }
+ }
+}
+
+func TestFindAndHash(t *testing.T) {
+ buf := make([]byte, 64)
+ buf2 := make([]byte, 64)
+ id := make([]byte, 8)
+ zero := make([]byte, 8)
+ for i := range id {
+ id[i] = byte(i)
+ }
+ numError := 0
+ errorf := func(msg string, args ...interface{}) {
+ t.Errorf(msg, args...)
+ if numError++; numError > 20 {
+ t.Logf("stopping after too many errors")
+ t.FailNow()
+ }
+ }
+ for bufSize := len(id); bufSize <= len(buf); bufSize++ {
+ for j := range buf {
+ for k := 0; k < 2*len(id) && j+k < len(buf); k++ {
+ for i := range buf {
+ buf[i] = 1
+ }
+ copy(buf[j:], id)
+ copy(buf[j+k:], id)
+ var m []int64
+ if j+len(id) <= j+k {
+ m = append(m, int64(j))
+ }
+ if j+k+len(id) <= len(buf) {
+ m = append(m, int64(j+k))
+ }
+ copy(buf2, buf)
+ for _, p := range m {
+ copy(buf2[p:], zero)
+ }
+ h := sha256.Sum256(buf2)
+
+ matches, hash, err := FindAndHash(bytes.NewReader(buf), string(id), bufSize)
+ if err != nil {
+ errorf("bufSize=%d j=%d k=%d: findAndHash: %v", bufSize, j, k, err)
+ continue
+ }
+ if !reflect.DeepEqual(matches, m) {
+ errorf("bufSize=%d j=%d k=%d: findAndHash: matches=%v, want %v", bufSize, j, k, matches, m)
+ continue
+ }
+ if hash != h {
+ errorf("bufSize=%d j=%d k=%d: findAndHash: matches correct, but hash=%x, want %x", bufSize, j, k, hash, h)
+ }
+ }
+ }
+ }
+}
+
+func TestExcludedReader(t *testing.T) {
+ const s = "0123456789abcdefghijklmn"
+ tests := []struct {
+ start, end int64 // excluded range
+ results []string // expected results of reads
+ }{
+ {12, 15, []string{"0123456789", "ab\x00\x00\x00fghij", "klmn"}}, // within one read
+ {8, 21, []string{"01234567\x00\x00", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", "\x00lmn"}}, // across multiple reads
+ {10, 20, []string{"0123456789", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", "klmn"}}, // a whole read
+ {0, 5, []string{"\x00\x00\x00\x00\x0056789", "abcdefghij", "klmn"}}, // start
+ {12, 24, []string{"0123456789", "ab\x00\x00\x00\x00\x00\x00\x00\x00", "\x00\x00\x00\x00"}}, // end
+ }
+ p := make([]byte, 10)
+ for _, test := range tests {
+ r := &excludedReader{strings.NewReader(s), 0, test.start, test.end}
+ for _, res := range test.results {
+ n, err := r.Read(p)
+ if err != nil {
+ t.Errorf("read failed: %v", err)
+ }
+ if n != len(res) {
+ t.Errorf("unexpected number of bytes read: want %d, got %d", len(res), n)
+ }
+ if string(p[:n]) != res {
+ t.Errorf("unexpected bytes: want %q, got %q", res, p[:n])
+ }
+ }
+ }
+}
diff --git a/src/cmd/internal/buildid/note.go b/src/cmd/internal/buildid/note.go
new file mode 100644
index 0000000..f5b6fc5
--- /dev/null
+++ b/src/cmd/internal/buildid/note.go
@@ -0,0 +1,208 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buildid
+
+import (
+ "bytes"
+ "debug/elf"
+ "debug/macho"
+ "encoding/binary"
+ "fmt"
+ "io"
+ "io/fs"
+ "os"
+)
+
+func readAligned4(r io.Reader, sz int32) ([]byte, error) {
+ full := (sz + 3) &^ 3
+ data := make([]byte, full)
+ _, err := io.ReadFull(r, data)
+ if err != nil {
+ return nil, err
+ }
+ data = data[:sz]
+ return data, nil
+}
+
+func ReadELFNote(filename, name string, typ int32) ([]byte, error) {
+ f, err := elf.Open(filename)
+ if err != nil {
+ return nil, err
+ }
+ defer f.Close()
+ for _, sect := range f.Sections {
+ if sect.Type != elf.SHT_NOTE {
+ continue
+ }
+ r := sect.Open()
+ for {
+ var namesize, descsize, noteType int32
+ err = binary.Read(r, f.ByteOrder, &namesize)
+ if err != nil {
+ if err == io.EOF {
+ break
+ }
+ return nil, fmt.Errorf("read namesize failed: %v", err)
+ }
+ err = binary.Read(r, f.ByteOrder, &descsize)
+ if err != nil {
+ return nil, fmt.Errorf("read descsize failed: %v", err)
+ }
+ err = binary.Read(r, f.ByteOrder, &noteType)
+ if err != nil {
+ return nil, fmt.Errorf("read type failed: %v", err)
+ }
+ noteName, err := readAligned4(r, namesize)
+ if err != nil {
+ return nil, fmt.Errorf("read name failed: %v", err)
+ }
+ desc, err := readAligned4(r, descsize)
+ if err != nil {
+ return nil, fmt.Errorf("read desc failed: %v", err)
+ }
+ if name == string(noteName) && typ == noteType {
+ return desc, nil
+ }
+ }
+ }
+ return nil, nil
+}
+
+var elfGoNote = []byte("Go\x00\x00")
+var elfGNUNote = []byte("GNU\x00")
+
+// The Go build ID is stored in a note described by an ELF PT_NOTE prog
+// header. The caller has already opened filename, to get f, and read
+// at least 4 kB out, in data.
+func readELF(name string, f *os.File, data []byte) (buildid string, err error) {
+ // Assume the note content is in the data, already read.
+ // Rewrite the ELF header to set shnum to 0, so that we can pass
+ // the data to elf.NewFile and it will decode the Prog list but not
+ // try to read the section headers and the string table from disk.
+ // That's a waste of I/O when all we care about is the Prog list
+ // and the one ELF note.
+ switch elf.Class(data[elf.EI_CLASS]) {
+ case elf.ELFCLASS32:
+ data[48] = 0
+ data[49] = 0
+ case elf.ELFCLASS64:
+ data[60] = 0
+ data[61] = 0
+ }
+
+ const elfGoBuildIDTag = 4
+ const gnuBuildIDTag = 3
+
+ ef, err := elf.NewFile(bytes.NewReader(data))
+ if err != nil {
+ return "", &fs.PathError{Path: name, Op: "parse", Err: err}
+ }
+ var gnu string
+ for _, p := range ef.Progs {
+ if p.Type != elf.PT_NOTE || p.Filesz < 16 {
+ continue
+ }
+
+ var note []byte
+ if p.Off+p.Filesz < uint64(len(data)) {
+ note = data[p.Off : p.Off+p.Filesz]
+ } else {
+ // For some linkers, such as the Solaris linker,
+ // the buildid may not be found in data (which
+ // likely contains the first 16kB of the file)
+ // or even the first few megabytes of the file
+ // due to differences in note segment placement;
+ // in that case, extract the note data manually.
+ _, err = f.Seek(int64(p.Off), io.SeekStart)
+ if err != nil {
+ return "", err
+ }
+
+ note = make([]byte, p.Filesz)
+ _, err = io.ReadFull(f, note)
+ if err != nil {
+ return "", err
+ }
+ }
+
+ filesz := p.Filesz
+ off := p.Off
+ for filesz >= 16 {
+ nameSize := ef.ByteOrder.Uint32(note)
+ valSize := ef.ByteOrder.Uint32(note[4:])
+ tag := ef.ByteOrder.Uint32(note[8:])
+ nname := note[12:16]
+ if nameSize == 4 && 16+valSize <= uint32(len(note)) && tag == elfGoBuildIDTag && bytes.Equal(nname, elfGoNote) {
+ return string(note[16 : 16+valSize]), nil
+ }
+
+ if nameSize == 4 && 16+valSize <= uint32(len(note)) && tag == gnuBuildIDTag && bytes.Equal(nname, elfGNUNote) {
+ gnu = string(note[16 : 16+valSize])
+ }
+
+ nameSize = (nameSize + 3) &^ 3
+ valSize = (valSize + 3) &^ 3
+ notesz := uint64(12 + nameSize + valSize)
+ if filesz <= notesz {
+ break
+ }
+ off += notesz
+ align := p.Align
+ alignedOff := (off + align - 1) &^ (align - 1)
+ notesz += alignedOff - off
+ off = alignedOff
+ filesz -= notesz
+ note = note[notesz:]
+ }
+ }
+
+ // If we didn't find a Go note, use a GNU note if available.
+ // This is what gccgo uses.
+ if gnu != "" {
+ return gnu, nil
+ }
+
+ // No note. Treat as successful but build ID empty.
+ return "", nil
+}
+
+// The Go build ID is stored at the beginning of the Mach-O __text segment.
+// The caller has already opened filename, to get f, and read a few kB out, in data.
+// Sadly, that's not guaranteed to hold the note, because there is an arbitrary amount
+// of other junk placed in the file ahead of the main text.
+func readMacho(name string, f *os.File, data []byte) (buildid string, err error) {
+ // If the data we want has already been read, don't worry about Mach-O parsing.
+ // This is both an optimization and a hedge against the Mach-O parsing failing
+ // in the future due to, for example, the name of the __text section changing.
+ if b, err := readRaw(name, data); b != "" && err == nil {
+ return b, err
+ }
+
+ mf, err := macho.NewFile(f)
+ if err != nil {
+ return "", &fs.PathError{Path: name, Op: "parse", Err: err}
+ }
+
+ sect := mf.Section("__text")
+ if sect == nil {
+ // Every binary has a __text section. Something is wrong.
+ return "", &fs.PathError{Path: name, Op: "parse", Err: fmt.Errorf("cannot find __text section")}
+ }
+
+ // It should be in the first few bytes, but read a lot just in case,
+ // especially given our past problems on OS X with the build ID moving.
+ // There shouldn't be much difference between reading 4kB and 32kB:
+ // the hard part is getting to the data, not transferring it.
+ n := sect.Size
+ if n > uint64(readSize) {
+ n = uint64(readSize)
+ }
+ buf := make([]byte, n)
+ if _, err := f.ReadAt(buf, int64(sect.Offset)); err != nil {
+ return "", err
+ }
+
+ return readRaw(name, buf)
+}
diff --git a/src/cmd/internal/buildid/rewrite.go b/src/cmd/internal/buildid/rewrite.go
new file mode 100644
index 0000000..a792895
--- /dev/null
+++ b/src/cmd/internal/buildid/rewrite.go
@@ -0,0 +1,162 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buildid
+
+import (
+ "bytes"
+ "cmd/internal/codesign"
+ "crypto/sha256"
+ "debug/macho"
+ "fmt"
+ "io"
+)
+
+// FindAndHash reads all of r and returns the offsets of occurrences of id.
+// While reading, findAndHash also computes and returns
+// a hash of the content of r, but with occurrences of id replaced by zeros.
+// FindAndHash reads bufSize bytes from r at a time.
+// If bufSize == 0, FindAndHash uses a reasonable default.
+func FindAndHash(r io.Reader, id string, bufSize int) (matches []int64, hash [32]byte, err error) {
+ if bufSize == 0 {
+ bufSize = 31 * 1024 // bufSize+little will likely fit in 32 kB
+ }
+ if len(id) > bufSize {
+ return nil, [32]byte{}, fmt.Errorf("buildid.FindAndHash: buffer too small")
+ }
+ zeros := make([]byte, len(id))
+ idBytes := []byte(id)
+
+ // For Mach-O files, we want to exclude the code signature.
+ // The code signature contains hashes of the whole file (except the signature
+ // itself), including the buildid. So the buildid cannot contain the signature.
+ r = excludeMachoCodeSignature(r)
+
+ // The strategy is to read the file through buf, looking for id,
+ // but we need to worry about what happens if id is broken up
+ // and returned in parts by two different reads.
+ // We allocate a tiny buffer (at least len(id)) and a big buffer (bufSize bytes)
+ // next to each other in memory and then copy the tail of
+ // one read into the tiny buffer before reading new data into the big buffer.
+ // The search for id is over the entire tiny+big buffer.
+ tiny := (len(id) + 127) &^ 127 // round up to 128-aligned
+ buf := make([]byte, tiny+bufSize)
+ h := sha256.New()
+ start := tiny
+ for offset := int64(0); ; {
+ // The file offset maintained by the loop corresponds to &buf[tiny].
+ // buf[start:tiny] is left over from previous iteration.
+ // After reading n bytes into buf[tiny:], we process buf[start:tiny+n].
+ n, err := io.ReadFull(r, buf[tiny:])
+ if err != io.ErrUnexpectedEOF && err != io.EOF && err != nil {
+ return nil, [32]byte{}, err
+ }
+
+ // Process any matches.
+ for {
+ i := bytes.Index(buf[start:tiny+n], idBytes)
+ if i < 0 {
+ break
+ }
+ matches = append(matches, offset+int64(start+i-tiny))
+ h.Write(buf[start : start+i])
+ h.Write(zeros)
+ start += i + len(id)
+ }
+ if n < bufSize {
+ // Did not fill buffer, must be at end of file.
+ h.Write(buf[start : tiny+n])
+ break
+ }
+
+ // Process all but final tiny bytes of buf (bufSize = len(buf)-tiny).
+ // Note that start > len(buf)-tiny is possible, if the search above
+ // found an id ending in the final tiny fringe. That's OK.
+ if start < len(buf)-tiny {
+ h.Write(buf[start : len(buf)-tiny])
+ start = len(buf) - tiny
+ }
+
+ // Slide ending tiny-sized fringe to beginning of buffer.
+ copy(buf[0:], buf[bufSize:])
+ start -= bufSize
+ offset += int64(bufSize)
+ }
+ h.Sum(hash[:0])
+ return matches, hash, nil
+}
+
+func Rewrite(w io.WriterAt, pos []int64, id string) error {
+ b := []byte(id)
+ for _, p := range pos {
+ if _, err := w.WriteAt(b, p); err != nil {
+ return err
+ }
+ }
+
+ // Update Mach-O code signature, if any.
+ if f, cmd, ok := findMachoCodeSignature(w); ok {
+ if codesign.Size(int64(cmd.Dataoff), "a.out") == int64(cmd.Datasize) {
+ // Update the signature if the size matches, so we don't need to
+ // fix up headers. Binaries generated by the Go linker should have
+ // the expected size. Otherwise skip.
+ text := f.Segment("__TEXT")
+ cs := make([]byte, cmd.Datasize)
+ codesign.Sign(cs, w.(io.Reader), "a.out", int64(cmd.Dataoff), int64(text.Offset), int64(text.Filesz), f.Type == macho.TypeExec)
+ if _, err := w.WriteAt(cs, int64(cmd.Dataoff)); err != nil {
+ return err
+ }
+ }
+ }
+
+ return nil
+}
+
+func excludeMachoCodeSignature(r io.Reader) io.Reader {
+ _, cmd, ok := findMachoCodeSignature(r)
+ if !ok {
+ return r
+ }
+ return &excludedReader{r, 0, int64(cmd.Dataoff), int64(cmd.Dataoff + cmd.Datasize)}
+}
+
+// excludedReader wraps an io.Reader. Reading from it returns the bytes from
+// the underlying reader, except that when the byte offset is within the
+// range between start and end, it returns zero bytes.
+type excludedReader struct {
+ r io.Reader
+ off int64 // current offset
+ start, end int64 // the range to be excluded (read as zero)
+}
+
+func (r *excludedReader) Read(p []byte) (int, error) {
+ n, err := r.r.Read(p)
+ if n > 0 && r.off+int64(n) > r.start && r.off < r.end {
+ cstart := r.start - r.off
+ if cstart < 0 {
+ cstart = 0
+ }
+ cend := r.end - r.off
+ if cend > int64(n) {
+ cend = int64(n)
+ }
+ zeros := make([]byte, cend-cstart)
+ copy(p[cstart:cend], zeros)
+ }
+ r.off += int64(n)
+ return n, err
+}
+
+func findMachoCodeSignature(r interface{}) (*macho.File, codesign.CodeSigCmd, bool) {
+ ra, ok := r.(io.ReaderAt)
+ if !ok {
+ return nil, codesign.CodeSigCmd{}, false
+ }
+ f, err := macho.NewFile(ra)
+ if err != nil {
+ return nil, codesign.CodeSigCmd{}, false
+ }
+ cmd, ok := codesign.FindCodeSigCmd(f)
+ return f, cmd, ok
+}
diff --git a/src/cmd/internal/buildid/testdata/a.elf.base64 b/src/cmd/internal/buildid/testdata/a.elf.base64
new file mode 100644
index 0000000..fa85521
--- /dev/null
+++ b/src/cmd/internal/buildid/testdata/a.elf.base64
@@ -0,0 +1 @@
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diff --git a/src/cmd/internal/buildid/testdata/a.macho.base64 b/src/cmd/internal/buildid/testdata/a.macho.base64
new file mode 100644
index 0000000..2e9f6a7
--- /dev/null
+++ b/src/cmd/internal/buildid/testdata/a.macho.base64
@@ -0,0 +1 @@
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diff --git a/src/cmd/internal/buildid/testdata/a.pe.base64 b/src/cmd/internal/buildid/testdata/a.pe.base64
new file mode 100644
index 0000000..d3a31a3
--- /dev/null
+++ b/src/cmd/internal/buildid/testdata/a.pe.base64
@@ -0,0 +1 @@
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diff --git a/src/cmd/internal/buildid/testdata/p.a.base64 b/src/cmd/internal/buildid/testdata/p.a.base64
new file mode 100644
index 0000000..ba96c10
--- /dev/null
+++ b/src/cmd/internal/buildid/testdata/p.a.base64
@@ -0,0 +1 @@
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