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net: fix {FileConn, FileListener, FilePacketConn} fd leak to child process.

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All of them call `newFileFD' which must properly restore close-on-exec on
duplicated fds.

R=golang-dev, bradfitz, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/6445081
This commit is contained in:
Sébastien Paolacci 2012-09-04 12:37:23 -07:00 committed by Brad Fitzpatrick
parent 532dee3842
commit 2836c63459
2 changed files with 16 additions and 0 deletions
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4
src/pkg/net/file.go
View File

@ -12,10 +12,14 @@ import (
)
func newFileFD(f *os.File) (*netFD, error) {
syscall.ForkLock.RLock()
fd, err := syscall.Dup(int(f.Fd()))
if err != nil {
syscall.ForkLock.RUnlock()
return nil, os.NewSyscallError("dup", err)
}
syscall.CloseOnExec(fd)
syscall.ForkLock.RUnlock()
sotype, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_TYPE)
if err != nil {

12
src/pkg/os/exec/exec_test.go
View File

@ -167,6 +167,18 @@ func TestExtraFiles(t *testing.T) {
}
defer ln.Close()
// Make sure duplicated fds don't leak to the child.
f, err := ln.(*net.TCPListener).File()
if err != nil {
t.Fatal(err)
}
defer f.Close()
ln2, err := net.FileListener(f)
if err != nil {
t.Fatal(err)
}
defer ln2.Close()
// Force TLS root certs to be loaded (which might involve
// cgo), to make sure none of that potential C code leaks fds.
ts := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {