File size: 4,227 Bytes
d7a5f2f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 | // Copyright 2025 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.
//go:build darwin
package ld
import (
"debug/macho"
"fmt"
"internal/testenv"
"os"
"path/filepath"
"testing"
)
func TestMachoSectionsReadOnly(t *testing.T) {
t.Parallel()
testenv.MustHaveGoBuild(t)
const (
prog = `package main; func main() {}`
progC = `package main; import "C"; func main() {}`
)
tests := []struct {
name string
args []string
prog string
wantSecsRO []string
mustHaveCGO bool
mustInternalLink bool
}{
{
name: "linkmode-internal",
args: []string{"-ldflags", "-linkmode=internal"},
prog: prog,
mustInternalLink: true,
wantSecsRO: []string{"__got", "__rodata", "__itablink", "__typelink"},
},
{
name: "linkmode-external",
args: []string{"-ldflags", "-linkmode=external"},
prog: prog,
mustHaveCGO: true,
wantSecsRO: []string{"__got", "__rodata", "__itablink", "__typelink"},
},
{
name: "cgo-linkmode-internal",
args: []string{"-ldflags", "-linkmode=external"},
prog: progC,
mustHaveCGO: true,
mustInternalLink: true,
wantSecsRO: []string{"__got", "__rodata", "__itablink", "__typelink"},
},
{
name: "cgo-linkmode-external",
args: []string{"-ldflags", "-linkmode=external"},
prog: progC,
mustHaveCGO: true,
wantSecsRO: []string{"__got", "__rodata", "__itablink", "__typelink"},
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
if test.mustInternalLink {
testenv.MustInternalLink(t, testenv.SpecialBuildTypes{Cgo: test.mustHaveCGO})
}
if test.mustHaveCGO {
testenv.MustHaveCGO(t)
}
var (
dir = t.TempDir()
src = filepath.Join(dir, fmt.Sprintf("macho_%s.go", test.name))
binFile = filepath.Join(dir, test.name)
)
if err := os.WriteFile(src, []byte(test.prog), 0666); err != nil {
t.Fatal(err)
}
cmdArgs := append([]string{"build", "-o", binFile}, append(test.args, src)...)
cmd := testenv.Command(t, testenv.GoToolPath(t), cmdArgs...)
if out, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("failed to build %v: %v:\n%s", cmd.Args, err, out)
}
fi, err := os.Open(binFile)
if err != nil {
t.Fatalf("failed to open built file: %v", err)
}
defer fi.Close()
machoFile, err := macho.NewFile(fi)
if err != nil {
t.Fatalf("failed to parse macho file: %v", err)
}
defer machoFile.Close()
// Load segments
segs := make(map[string]*macho.Segment)
for _, l := range machoFile.Loads {
if s, ok := l.(*macho.Segment); ok {
segs[s.Name] = s
}
}
for _, wsroname := range test.wantSecsRO {
// Now walk the sections. Section should be part of
// some segment that is made readonly after
// relocations are appied.
var wsro *macho.Section
foundRO := false
for _, s := range machoFile.Sections {
if s.Name == wsroname {
seg := segs[s.Seg]
if seg == nil {
t.Fatalf("test %s: can't locate segment for %q section",
test.name, wsroname)
}
if seg.Flag == 0x10 { // SG_READ_ONLY
foundRO = true
wsro = s
break
}
}
}
if wsro == nil {
t.Fatalf("test %s: can't locate %q section",
test.name, wsroname)
continue
}
if !foundRO {
// Things went off the rails. Write out some
// useful information for a human looking at the
// test failure.
t.Logf("test %s: %q section not in readonly segment",
wsro.Name, test.name)
t.Logf("section %s location: st=0x%x en=0x%x\n",
wsro.Name, wsro.Addr, wsro.Addr+wsro.Size)
t.Logf("sec %s found in this segment: ", wsro.Seg)
t.Logf("\nall segments: \n")
for _, l := range machoFile.Loads {
if s, ok := l.(*macho.Segment); ok {
t.Logf("cmd=%s fl=%d st=0x%x en=0x%x\n",
s.Cmd, s.Flag, s.Addr, s.Addr+s.Filesz)
}
}
t.Fatalf("test %s failed", test.name)
}
}
})
}
}
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