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https://github.com/golang/go
synced 2024-11-11 22:10:22 -07:00
debug/pe: truncate pe sections to their size in memory
Section.Data returns disk section data, but those are rounded up to some predefined value. Processing these as is confuses dwarf parser because of garbage at the end. Truncate Section.Data as per memory section description. Sometimes dwarf sections have memory section size of 0 (for pe object files). Keep those to their disk size. Fixes #11608 Change-Id: I8de0a2271201a24aa9ac8dac44f1e9c8a9285183 Reviewed-on: https://go-review.googlesource.com/11950 Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Alex Brainman
parent
b615ad8fd5
commit
315e5c99d8
@ -310,6 +310,9 @@ func (f *File) DWARF() (*dwarf.Data, error) {
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if err != nil && uint32(len(b)) < s.Size {
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return nil, err
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}
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if 0 < s.VirtualSize && s.VirtualSize < s.Size {
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b = b[:s.VirtualSize]
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}
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dat[i] = b
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}
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@ -5,24 +5,30 @@
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package pe
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import (
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"debug/dwarf"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"reflect"
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"runtime"
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"testing"
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)
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type fileTest struct {
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file string
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hdr FileHeader
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opthdr interface{}
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sections []*SectionHeader
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symbols []*Symbol
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file string
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hdr FileHeader
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opthdr interface{}
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sections []*SectionHeader
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symbols []*Symbol
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hasNoDwarfInfo bool
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}
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var fileTests = []fileTest{
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{
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"testdata/gcc-386-mingw-obj",
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FileHeader{0x014c, 0x000c, 0x0, 0x64a, 0x1e, 0x0, 0x104},
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nil,
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[]*SectionHeader{
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file: "testdata/gcc-386-mingw-obj",
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hdr: FileHeader{0x014c, 0x000c, 0x0, 0x64a, 0x1e, 0x0, 0x104},
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sections: []*SectionHeader{
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{".text", 0, 0, 36, 500, 1440, 0, 3, 0, 0x60300020},
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{".data", 0, 0, 0, 0, 0, 0, 0, 0, 3224371264},
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{".bss", 0, 0, 0, 0, 0, 0, 0, 0, 3224371328},
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@ -36,7 +42,7 @@ var fileTests = []fileTest{
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{".debug_pubtypes", 0, 0, 38, 1370, 1580, 0, 1, 0, 1108344832},
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{".debug_aranges", 0, 0, 32, 1408, 1590, 0, 2, 0, 1108344832},
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},
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[]*Symbol{
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symbols: []*Symbol{
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{".file", 0x0, -2, 0x0, 0x67},
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{"_main", 0x0, 1, 0x20, 0x2},
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{".text", 0x0, 1, 0x0, 0x3},
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@ -56,9 +62,9 @@ var fileTests = []fileTest{
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},
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},
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{
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"testdata/gcc-386-mingw-exec",
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FileHeader{0x014c, 0x000f, 0x4c6a1b60, 0x3c00, 0x282, 0xe0, 0x107},
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&OptionalHeader32{
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file: "testdata/gcc-386-mingw-exec",
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hdr: FileHeader{0x014c, 0x000f, 0x4c6a1b60, 0x3c00, 0x282, 0xe0, 0x107},
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opthdr: &OptionalHeader32{
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0x10b, 0x2, 0x38, 0xe00, 0x1a00, 0x200, 0x1160, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x10000, 0x400, 0x14abb, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
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[16]DataDirectory{
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{0x0, 0x0},
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@ -79,7 +85,7 @@ var fileTests = []fileTest{
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{0x0, 0x0},
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},
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},
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[]*SectionHeader{
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sections: []*SectionHeader{
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{".text", 0xcd8, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060},
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{".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
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{".rdata", 0x120, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040},
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@ -96,13 +102,11 @@ var fileTests = []fileTest{
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{".debug_frame", 0x34, 0xe000, 0x200, 0x3800, 0x0, 0x0, 0x0, 0x0, 0x42300000},
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{".debug_loc", 0x38, 0xf000, 0x200, 0x3a00, 0x0, 0x0, 0x0, 0x0, 0x42100000},
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},
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[]*Symbol{},
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},
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{
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"testdata/gcc-amd64-mingw-obj",
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FileHeader{0x8664, 0x6, 0x0, 0x198, 0x12, 0x0, 0x4},
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nil,
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[]*SectionHeader{
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file: "testdata/gcc-amd64-mingw-obj",
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hdr: FileHeader{0x8664, 0x6, 0x0, 0x198, 0x12, 0x0, 0x4},
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sections: []*SectionHeader{
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{".text", 0x0, 0x0, 0x30, 0x104, 0x15c, 0x0, 0x3, 0x0, 0x60500020},
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{".data", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500040},
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{".bss", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500080},
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@ -110,7 +114,7 @@ var fileTests = []fileTest{
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{".xdata", 0x0, 0x0, 0xc, 0x144, 0x0, 0x0, 0x0, 0x0, 0x40300040},
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{".pdata", 0x0, 0x0, 0xc, 0x150, 0x17a, 0x0, 0x3, 0x0, 0x40300040},
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},
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[]*Symbol{
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symbols: []*Symbol{
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{".file", 0x0, -2, 0x0, 0x67},
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{"main", 0x0, 1, 0x20, 0x2},
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{".text", 0x0, 1, 0x0, 0x3},
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@ -122,11 +126,12 @@ var fileTests = []fileTest{
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{"__main", 0x0, 0, 0x20, 0x2},
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{"puts", 0x0, 0, 0x20, 0x2},
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},
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hasNoDwarfInfo: true,
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},
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{
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"testdata/gcc-amd64-mingw-exec",
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FileHeader{0x8664, 0x11, 0x53e4364f, 0x39600, 0x6fc, 0xf0, 0x27},
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&OptionalHeader64{
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file: "testdata/gcc-amd64-mingw-exec",
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hdr: FileHeader{0x8664, 0x11, 0x53e4364f, 0x39600, 0x6fc, 0xf0, 0x27},
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opthdr: &OptionalHeader64{
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0x20b, 0x2, 0x16, 0x6a00, 0x2400, 0x1600, 0x14e0, 0x1000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x0, 0x0, 0x5, 0x2, 0x0, 0x45000, 0x600, 0x46f19, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
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[16]DataDirectory{
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{0x0, 0x0},
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@ -146,7 +151,7 @@ var fileTests = []fileTest{
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{0x0, 0x0},
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{0x0, 0x0},
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}},
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[]*SectionHeader{
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sections: []*SectionHeader{
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{".text", 0x6860, 0x1000, 0x6a00, 0x600, 0x0, 0x0, 0x0, 0x0, 0x60500020},
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{".data", 0xe0, 0x8000, 0x200, 0x7000, 0x0, 0x0, 0x0, 0x0, 0xc0500040},
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{".rdata", 0x6b0, 0x9000, 0x800, 0x7200, 0x0, 0x0, 0x0, 0x0, 0x40600040},
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@ -165,7 +170,6 @@ var fileTests = []fileTest{
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{".debug_loc", 0x13240, 0x30000, 0x13400, 0x25600, 0x0, 0x0, 0x0, 0x0, 0x42100040},
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{".debug_ranges", 0xa70, 0x44000, 0xc00, 0x38a00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
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},
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[]*Symbol{},
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},
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}
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@ -231,6 +235,12 @@ func TestOpen(t *testing.T) {
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t.Errorf("open %s, symbol %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
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}
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}
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if !tt.hasNoDwarfInfo {
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_, err = f.DWARF()
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if err != nil {
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t.Errorf("fetching %s dwarf details failed: %v", tt.file, err)
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}
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}
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}
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}
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@ -241,3 +251,59 @@ func TestOpenFailure(t *testing.T) {
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t.Errorf("open %s: succeeded unexpectedly", filename)
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}
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}
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func TestDWARF(t *testing.T) {
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if runtime.GOOS != "windows" {
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t.Skip("skipping windows only test")
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}
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tmpdir, err := ioutil.TempDir("", "TestDWARF")
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if err != nil {
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t.Fatal("TempDir failed: ", err)
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}
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defer os.RemoveAll(tmpdir)
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prog := `
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package main
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func main() {
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}
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`
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src := filepath.Join(tmpdir, "a.go")
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exe := filepath.Join(tmpdir, "a.exe")
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err = ioutil.WriteFile(src, []byte(prog), 0644)
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output, err := exec.Command("go", "build", "-o", exe, src).CombinedOutput()
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if err != nil {
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t.Fatalf("building test executable failed: %s %s", err, output)
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}
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f, err := Open(exe)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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d, err := f.DWARF()
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if err != nil {
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t.Fatal(err)
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}
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// look for main.main
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r := d.Reader()
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for {
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e, err := r.Next()
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if err != nil {
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t.Fatal("r.Next:", err)
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}
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if e == nil {
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break
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}
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if e.Tag == dwarf.TagSubprogram {
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for _, f := range e.Field {
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if f.Attr == dwarf.AttrName && e.Val(dwarf.AttrName) == "main.main" {
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return
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}
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}
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}
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}
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t.Fatal("main.main not found")
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}
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