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cmd/compile: use absolute file name in isCgo check

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For #23672
Fixes #63211
Fixes CVE-2023-39323

Change-Id: I4586a69e1b2560036afec29d53e53cf25e6c7352
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2032884
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/534158
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2023-09-20 16:16:29 -07:00 committed by Gopher Robot
parent a5943e9de1
commit e7c142a19d
3 changed files with 19 additions and 1 deletions
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1
src/cmd/cgo/internal/testerrors/errors_test.go
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@ -118,6 +118,7 @@ func TestReportsTypeErrors(t *testing.T) {
for _, file := range []string{
"err1.go",
"err2.go",
"err5.go",
"issue11097a.go",
"issue11097b.go",
"issue18452.go",

11
src/cmd/cgo/internal/testerrors/testdata/err5.go vendored Normal file
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@ -0,0 +1,11 @@
// Copyright 2023 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 main
//line /tmp/_cgo_.go:1
//go:cgo_dynamic_linker "/elf/interp"
// ERROR MESSAGE: only allowed in cgo-generated code
func main() {}

8
src/cmd/compile/internal/noder/noder.go
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@ -332,8 +332,14 @@ func (p *noder) pragma(pos syntax.Pos, blankLine bool, text string, old syntax.P
// contain cgo directives, and for security reasons
// (primarily misuse of linker flags), other files are not.
// See golang.org/issue/23672.
// Note that cmd/go ignores files whose names start with underscore,
// so the only _cgo_ files we will see from cmd/go are generated by cgo.
// It's easy to bypass this check by calling the compiler directly;
// we only protect against uses by cmd/go.
func isCgoGeneratedFile(pos syntax.Pos) bool {
return strings.HasPrefix(filepath.Base(trimFilename(pos.Base())), "_cgo_")
// We need the absolute file, independent of //line directives,
// so we call pos.Base().Pos().
return strings.HasPrefix(filepath.Base(trimFilename(pos.Base().Pos().Base())), "_cgo_")
}
// safeArg reports whether arg is a "safe" command-line argument,