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// 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.
//go:build freebsd
package syscall_test
import (
"fmt"
"internal/testenv"
"os"
"os/exec"
"path/filepath"
"syscall"
"testing"
"unsafe"
)
const (
flagJailCreate = uintptr(0x1)
)
func prepareJail(t *testing.T) (int, string) {
t.Helper()
root := t.TempDir()
paramPath := []byte("path\x00")
conf := make([]syscall.Iovec, 4)
conf[0].Base = ¶mPath[0]
conf[0].SetLen(len(paramPath))
p, err := syscall.BytePtrFromString(root)
if err != nil {
t.Fatal(err)
}
conf[1].Base = p
conf[1].SetLen(len(root) + 1)
paramPersist := []byte("persist\x00")
conf[2].Base = ¶mPersist[0]
conf[2].SetLen(len(paramPersist))
conf[3].Base = nil
conf[3].SetLen(0)
id, _, err1 := syscall.Syscall(syscall.SYS_JAIL_SET,
uintptr(unsafe.Pointer(&conf[0])), uintptr(len(conf)), flagJailCreate)
if err1 != 0 {
t.Fatalf("jail_set: %v", err1)
}
t.Cleanup(func() {
_, _, err1 := syscall.Syscall(syscall.SYS_JAIL_REMOVE, id, 0, 0)
if err1 != 0 {
t.Errorf("failed to cleanup jail: %v", err)
}
})
return int(id), root
}
func TestJailAttach(t *testing.T) {
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
jailed, err := syscall.SysctlUint32("security.jail.jailed")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
if jailed != 1 {
t.Fatalf("jailed = %d, want 1", jailed)
}
return
}
testenv.MustHaveGoBuild(t)
// Make sure we are running as root, so we have permissions to create
// and remove jails.
if os.Getuid() != 0 {
t.Skip("kernel prohibits jail system calls in unprivileged process")
}
jid, root := prepareJail(t)
// Since jail attach does an implicit chroot to the jail's path,
// we need the binary there, and it must be statically linked.
x := filepath.Join(root, "syscall.test")
cmd := exec.Command(testenv.GoToolPath(t), "test", "-c", "-o", x, "syscall")
cmd.Env = append(os.Environ(), "CGO_ENABLED=0")
if o, err := cmd.CombinedOutput(); err != nil {
t.Fatalf("Build of syscall in jail root failed, output %v, err %v", o, err)
}
cmd = exec.Command("/syscall.test", "-test.run=TestJailAttach", "/")
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.SysProcAttr = &syscall.SysProcAttr{Jail: jid}
out, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("Cmd failed with err %v, output: %s", err, out)
}
}
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