diff options
Diffstat (limited to '')
| -rw-r--r-- | src/cmd/internal/buildid/buildid.go | 343 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/buildid_test.go | 179 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/note.go | 208 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/rewrite.go | 162 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/testdata/a.elf.base64 | 1 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/testdata/a.macho.base64 | 1 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/testdata/a.pe.base64 | 1 | ||||
| -rw-r--r-- | src/cmd/internal/buildid/testdata/p.a.base64 | 1 |
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 Apple’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, ¬eType) + 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) 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