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cmd/internal/obj: reject too large symbols
We never supported symbol larger than 2GB (issue #9862), so the object file uses 32-bit for symbol sizes. Check and reject too large symbol before truncating its size. Fixes #42054. Change-Id: I0d1d585ebdba9556f2fd3a97043bd4296d5cc9e4 Reviewed-on: https://go-review.googlesource.com/c/go/+/263641 Trust: Cherry Zhang <cherryyz@google.com> Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org>
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@ -261,6 +261,10 @@ func (w *writer) StringTable() {
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}
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}
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// cutoff is the maximum data section size permitted by the linker
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// (see issue #9862).
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const cutoff = int64(2e9) // 2 GB (or so; looks better in errors than 2^31)
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func (w *writer) Sym(s *LSym) {
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abi := uint16(s.ABI())
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if s.Static() {
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@ -325,6 +329,9 @@ func (w *writer) Sym(s *LSym) {
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// don't bother setting align to 1.
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}
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}
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if s.Size > cutoff {
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w.ctxt.Diag("%s: symbol too large (%d bytes > %d bytes)", s.Name, s.Size, cutoff)
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}
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var o goobj.Sym
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o.SetName(name, w.Writer)
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o.SetABI(abi)
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@ -5,9 +5,16 @@
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package obj
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import (
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"bytes"
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"cmd/internal/goobj"
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"cmd/internal/sys"
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"internal/testenv"
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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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"testing"
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"unsafe"
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)
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var dummyArch = LinkArch{Arch: sys.ArchAMD64}
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@ -85,3 +92,32 @@ func TestContentHash(t *testing.T) {
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}
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}
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}
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func TestSymbolTooLarge(t *testing.T) { // Issue 42054
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testenv.MustHaveGoBuild(t)
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if unsafe.Sizeof(uintptr(0)) < 8 {
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t.Skip("skip on 32-bit architectures")
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}
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tmpdir, err := ioutil.TempDir("", "TestSymbolTooLarge")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmpdir)
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src := filepath.Join(tmpdir, "p.go")
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err = ioutil.WriteFile(src, []byte("package p; var x [1<<32]byte"), 0666)
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if err != nil {
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t.Fatalf("failed to write source file: %v\n", err)
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}
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obj := filepath.Join(tmpdir, "p.o")
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cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-o", obj, src)
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out, err := cmd.CombinedOutput()
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if err == nil {
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t.Fatalf("did not fail\noutput: %s", out)
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}
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const want = "symbol too large"
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if !bytes.Contains(out, []byte(want)) {
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t.Errorf("unexpected error message: want: %q, got: %s", want, out)
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}
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}
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@ -1,4 +1,4 @@
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// compile
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// skip
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// Copyright 2012 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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@ -7,6 +7,8 @@
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// Issue 4348. After switch to 64-bit ints the compiler generates
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// illegal instructions when using large array bounds or indexes.
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// Skip. We reject symbols larger that 2GB (Issue #9862).
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package main
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// 1<<32 on a 64-bit machine, 1 otherwise.
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