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Diffstat (limited to 'container/init.go')
-rw-r--r--container/init.go237
1 files changed, 121 insertions, 116 deletions
diff --git a/container/init.go b/container/init.go
index 663bbc83..6688a348 100644
--- a/container/init.go
+++ b/container/init.go
@@ -3,10 +3,8 @@ package container
import (
"errors"
"fmt"
- "log"
"os"
"os/exec"
- "os/signal"
"path"
"runtime"
"slices"
@@ -46,9 +44,9 @@ type (
// Implementations of this interface are sent as a stream of gobs.
Op interface {
// early is called in host root.
- early(state *setupState) error
+ early(state *setupState, k syscallDispatcher) error
// apply is called in intermediate root.
- apply(state *setupState) error
+ apply(state *setupState, k syscallDispatcher) error
prefix() string
Is(op Op) bool
@@ -82,16 +80,20 @@ type initParams struct {
Verbose bool
}
-func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
+func Init(prepareLogger func(prefix string), setVerbose func(verbose bool)) {
+ initEntrypoint(prepareLogger, setVerbose, direct{})
+}
+
+func initEntrypoint(prepareLogger func(prefix string), setVerbose func(verbose bool), k syscallDispatcher) {
runtime.LockOSThread()
- prepare("init")
+ prepareLogger("init")
- if os.Getpid() != 1 {
- log.Fatal("this process must run as pid 1")
+ if k.getpid() != 1 {
+ k.fatal("this process must run as pid 1")
}
- if err := SetPtracer(0); err != nil {
- msg.Verbosef("cannot enable ptrace protection via Yama LSM: %v", err)
+ if err := k.setPtracer(0); err != nil {
+ k.verbosef("cannot enable ptrace protection via Yama LSM: %v", err)
// not fatal: this program has no additional privileges at initial program start
}
@@ -101,64 +103,64 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
setupFile *os.File
offsetSetup int
)
- if f, err := Receive(setupEnv, &params, &setupFile); err != nil {
+ if f, err := k.receive(setupEnv, &params, &setupFile); err != nil {
if errors.Is(err, EBADF) {
- log.Fatal("invalid setup descriptor")
+ k.fatal("invalid setup descriptor")
}
if errors.Is(err, ErrNotSet) {
- log.Fatal("HAKUREI_SETUP not set")
+ k.fatal("HAKUREI_SETUP not set")
}
- log.Fatalf("cannot decode init setup payload: %v", err)
+ k.fatalf("cannot decode init setup payload: %v", err)
} else {
if params.Ops == nil {
- log.Fatal("invalid setup parameters")
+ k.fatal("invalid setup parameters")
}
if params.ParentPerm == 0 {
params.ParentPerm = 0755
}
setVerbose(params.Verbose)
- msg.Verbose("received setup parameters")
+ k.verbose("received setup parameters")
closeSetup = f
offsetSetup = int(setupFile.Fd() + 1)
}
// write uid/gid map here so parent does not need to set dumpable
- if err := SetDumpable(SUID_DUMP_USER); err != nil {
- log.Fatalf("cannot set SUID_DUMP_USER: %s", err)
+ if err := k.setDumpable(SUID_DUMP_USER); err != nil {
+ k.fatalf("cannot set SUID_DUMP_USER: %s", err)
}
- if err := os.WriteFile(FHSProc+"self/uid_map",
+ if err := k.writeFile(FHSProc+"self/uid_map",
append([]byte{}, strconv.Itoa(params.Uid)+" "+strconv.Itoa(params.HostUid)+" 1\n"...),
0); err != nil {
- log.Fatalf("%v", err)
+ k.fatalf("%v", err)
}
- if err := os.WriteFile(FHSProc+"self/setgroups",
+ if err := k.writeFile(FHSProc+"self/setgroups",
[]byte("deny\n"),
0); err != nil && !os.IsNotExist(err) {
- log.Fatalf("%v", err)
+ k.fatalf("%v", err)
}
- if err := os.WriteFile(FHSProc+"self/gid_map",
+ if err := k.writeFile(FHSProc+"self/gid_map",
append([]byte{}, strconv.Itoa(params.Gid)+" "+strconv.Itoa(params.HostGid)+" 1\n"...),
0); err != nil {
- log.Fatalf("%v", err)
+ k.fatalf("%v", err)
}
- if err := SetDumpable(SUID_DUMP_DISABLE); err != nil {
- log.Fatalf("cannot set SUID_DUMP_DISABLE: %s", err)
+ if err := k.setDumpable(SUID_DUMP_DISABLE); err != nil {
+ k.fatalf("cannot set SUID_DUMP_DISABLE: %s", err)
}
- oldmask := Umask(0)
+ oldmask := k.umask(0)
if params.Hostname != "" {
- if err := Sethostname([]byte(params.Hostname)); err != nil {
- log.Fatalf("cannot set hostname: %v", err)
+ if err := k.sethostname([]byte(params.Hostname)); err != nil {
+ k.fatalf("cannot set hostname: %v", err)
}
}
// cache sysctl before pivot_root
- LastCap()
+ k.lastcap()
- if err := Mount(zeroString, FHSRoot, zeroString, MS_SILENT|MS_SLAVE|MS_REC, zeroString); err != nil {
- log.Fatalf("cannot make / rslave: %v", err)
+ if err := k.mount(zeroString, FHSRoot, zeroString, MS_SILENT|MS_SLAVE|MS_REC, zeroString); err != nil {
+ k.fatalf("cannot make / rslave: %v", err)
}
state := &setupState{Params: &params.Params}
@@ -169,40 +171,40 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
the state of the mount namespace */
for i, op := range *params.Ops {
if op == nil || !op.Valid() {
- log.Fatalf("invalid op at index %d", i)
+ k.fatalf("invalid op at index %d", i)
}
- if err := op.early(state); err != nil {
- msg.PrintBaseErr(err,
- fmt.Sprintf("cannot prepare op %d:", i))
- msg.BeforeExit()
- os.Exit(1)
+ if err := op.early(state, k); err != nil {
+ k.printBaseErr(err,
+ fmt.Sprintf("cannot prepare op at index %d:", i))
+ k.beforeExit()
+ k.exit(1)
}
}
- if err := Mount(SourceTmpfsRootfs, intermediateHostPath, FstypeTmpfs, MS_NODEV|MS_NOSUID, zeroString); err != nil {
- log.Fatalf("cannot mount intermediate root: %v", err)
+ if err := k.mount(SourceTmpfsRootfs, intermediateHostPath, FstypeTmpfs, MS_NODEV|MS_NOSUID, zeroString); err != nil {
+ k.fatalf("cannot mount intermediate root: %v", err)
}
- if err := os.Chdir(intermediateHostPath); err != nil {
- log.Fatalf("cannot enter base path: %v", err)
+ if err := k.chdir(intermediateHostPath); err != nil {
+ k.fatalf("cannot enter intermediate host path: %v", err)
}
- if err := os.Mkdir(sysrootDir, 0755); err != nil {
- log.Fatalf("%v", err)
+ if err := k.mkdir(sysrootDir, 0755); err != nil {
+ k.fatalf("%v", err)
}
- if err := Mount(sysrootDir, sysrootDir, zeroString, MS_SILENT|MS_BIND|MS_REC, zeroString); err != nil {
- log.Fatalf("cannot bind sysroot: %v", err)
+ if err := k.mount(sysrootDir, sysrootDir, zeroString, MS_SILENT|MS_BIND|MS_REC, zeroString); err != nil {
+ k.fatalf("cannot bind sysroot: %v", err)
}
- if err := os.Mkdir(hostDir, 0755); err != nil {
- log.Fatalf("%v", err)
+ if err := k.mkdir(hostDir, 0755); err != nil {
+ k.fatalf("%v", err)
}
// pivot_root uncovers intermediateHostPath in hostDir
- if err := PivotRoot(intermediateHostPath, hostDir); err != nil {
- log.Fatalf("cannot pivot into intermediate root: %v", err)
+ if err := k.pivotRoot(intermediateHostPath, hostDir); err != nil {
+ k.fatalf("cannot pivot into intermediate root: %v", err)
}
- if err := os.Chdir(FHSRoot); err != nil {
- log.Fatalf("%v", err)
+ if err := k.chdir(FHSRoot); err != nil {
+ k.fatalf("cannot enter intermediate root: %v", err)
}
/* apply is called right after pivot_root and entering the new root;
@@ -211,62 +213,62 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
chdir is allowed but discouraged */
for i, op := range *params.Ops {
// ops already checked during early setup
- msg.Verbosef("%s %s", op.prefix(), op)
- if err := op.apply(state); err != nil {
- msg.PrintBaseErr(err,
- fmt.Sprintf("cannot apply op %d:", i))
- msg.BeforeExit()
- os.Exit(1)
+ k.verbosef("%s %s", op.prefix(), op)
+ if err := op.apply(state, k); err != nil {
+ k.printBaseErr(err,
+ fmt.Sprintf("cannot apply op at index %d:", i))
+ k.beforeExit()
+ k.exit(1)
}
}
// setup requiring host root complete at this point
- if err := Mount(hostDir, hostDir, zeroString, MS_SILENT|MS_REC|MS_PRIVATE, zeroString); err != nil {
- log.Fatalf("cannot make host root rprivate: %v", err)
+ if err := k.mount(hostDir, hostDir, zeroString, MS_SILENT|MS_REC|MS_PRIVATE, zeroString); err != nil {
+ k.fatalf("cannot make host root rprivate: %v", err)
}
- if err := Unmount(hostDir, MNT_DETACH); err != nil {
- log.Fatalf("cannot unmount host root: %v", err)
+ if err := k.unmount(hostDir, MNT_DETACH); err != nil {
+ k.fatalf("cannot unmount host root: %v", err)
}
{
var fd int
if err := IgnoringEINTR(func() (err error) {
- fd, err = Open(FHSRoot, O_DIRECTORY|O_RDONLY, 0)
+ fd, err = k.open(FHSRoot, O_DIRECTORY|O_RDONLY, 0)
return
}); err != nil {
- log.Fatalf("cannot open intermediate root: %v", err)
+ k.fatalf("cannot open intermediate root: %v", err)
}
- if err := os.Chdir(sysrootPath); err != nil {
- log.Fatalf("%v", err)
+ if err := k.chdir(sysrootPath); err != nil {
+ k.fatalf("cannot enter sysroot: %v", err)
}
- if err := PivotRoot(".", "."); err != nil {
- log.Fatalf("cannot pivot into sysroot: %v", err)
+ if err := k.pivotRoot(".", "."); err != nil {
+ k.fatalf("cannot pivot into sysroot: %v", err)
}
- if err := Fchdir(fd); err != nil {
- log.Fatalf("cannot re-enter intermediate root: %v", err)
+ if err := k.fchdir(fd); err != nil {
+ k.fatalf("cannot re-enter intermediate root: %v", err)
}
- if err := Unmount(".", MNT_DETACH); err != nil {
- log.Fatalf("cannot unmount intemediate root: %v", err)
+ if err := k.unmount(".", MNT_DETACH); err != nil {
+ k.fatalf("cannot unmount intemediate root: %v", err)
}
- if err := os.Chdir(FHSRoot); err != nil {
- log.Fatalf("%v", err)
+ if err := k.chdir(FHSRoot); err != nil {
+ k.fatalf("cannot enter root: %v", err)
}
- if err := Close(fd); err != nil {
- log.Fatalf("cannot close intermediate root: %v", err)
+ if err := k.close(fd); err != nil {
+ k.fatalf("cannot close intermediate root: %v", err)
}
}
- if _, _, errno := Syscall(SYS_PRCTL, PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0); errno != 0 {
- log.Fatalf("cannot clear the ambient capability set: %v", errno)
+ if err := k.capAmbientClearAll(); err != nil {
+ k.fatalf("cannot clear the ambient capability set: %v", err)
}
- for i := uintptr(0); i <= LastCap(); i++ {
+ for i := uintptr(0); i <= k.lastcap(); i++ {
if params.Privileged && i == CAP_SYS_ADMIN {
continue
}
- if _, _, errno := Syscall(SYS_PRCTL, PR_CAPBSET_DROP, i, 0); errno != 0 {
- log.Fatalf("cannot drop capability from bonding set: %v", errno)
+ if err := k.capBoundingSetDrop(i); err != nil {
+ k.fatalf("cannot drop capability from bounding set: %v", err)
}
}
@@ -274,38 +276,38 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
if params.Privileged {
keep[capToIndex(CAP_SYS_ADMIN)] |= capToMask(CAP_SYS_ADMIN)
- if _, _, errno := Syscall(SYS_PRCTL, PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, CAP_SYS_ADMIN); errno != 0 {
- log.Fatalf("cannot raise CAP_SYS_ADMIN: %v", errno)
+ if err := k.capAmbientRaise(CAP_SYS_ADMIN); err != nil {
+ k.fatalf("cannot raise CAP_SYS_ADMIN: %v", err)
}
}
- if err := capset(
+ if err := k.capset(
&capHeader{_LINUX_CAPABILITY_VERSION_3, 0},
&[2]capData{{0, keep[0], keep[0]}, {0, keep[1], keep[1]}},
); err != nil {
- log.Fatalf("cannot capset: %v", err)
+ k.fatalf("cannot capset: %v", err)
}
if !params.SeccompDisable {
rules := params.SeccompRules
if len(rules) == 0 { // non-empty rules slice always overrides presets
- msg.Verbosef("resolving presets %#x", params.SeccompPresets)
+ k.verbosef("resolving presets %#x", params.SeccompPresets)
rules = seccomp.Preset(params.SeccompPresets, params.SeccompFlags)
}
- if err := seccomp.Load(rules, params.SeccompFlags); err != nil {
+ if err := k.seccompLoad(rules, params.SeccompFlags); err != nil {
// this also indirectly asserts PR_SET_NO_NEW_PRIVS
- log.Fatalf("cannot load syscall filter: %v", err)
+ k.fatalf("cannot load syscall filter: %v", err)
}
- msg.Verbosef("%d filter rules loaded", len(rules))
+ k.verbosef("%d filter rules loaded", len(rules))
} else {
- msg.Verbose("syscall filter not configured")
+ k.verbose("syscall filter not configured")
}
extraFiles := make([]*os.File, params.Count)
for i := range extraFiles {
// setup fd is placed before all extra files
- extraFiles[i] = os.NewFile(uintptr(offsetSetup+i), "extra file "+strconv.Itoa(i))
+ extraFiles[i] = k.newFile(uintptr(offsetSetup+i), "extra file "+strconv.Itoa(i))
}
- Umask(oldmask)
+ k.umask(oldmask)
cmd := exec.Command(params.Path.String())
cmd.Stdin, cmd.Stdout, cmd.Stderr = os.Stdin, os.Stdout, os.Stderr
@@ -314,14 +316,14 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
cmd.ExtraFiles = extraFiles
cmd.Dir = params.Dir.String()
- msg.Verbosef("starting initial program %s", params.Path)
- if err := cmd.Start(); err != nil {
- log.Fatalf("%v", err)
+ k.verbosef("starting initial program %s", params.Path)
+ if err := k.start(cmd); err != nil {
+ k.fatalf("%v", err)
}
- msg.Suspend()
+ k.suspend()
if err := closeSetup(); err != nil {
- log.Printf("cannot close setup pipe: %v", err)
+ k.printf("cannot close setup pipe: %v", err)
// not fatal
}
@@ -351,11 +353,11 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
err = EINTR
for errors.Is(err, EINTR) {
- wpid, err = Wait4(-1, &wstatus, 0, nil)
+ wpid, err = k.wait4(-1, &wstatus, 0, nil)
}
}
if !errors.Is(err, ECHILD) {
- log.Printf("unexpected wait4 response: %v", err)
+ k.printf("unexpected wait4 response: %v", err)
}
close(done)
@@ -363,7 +365,7 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
// handle signals to dump withheld messages
sig := make(chan os.Signal, 2)
- signal.Notify(sig, os.Interrupt, CancelSignal)
+ k.notify(sig, os.Interrupt, CancelSignal)
// closed after residualProcessTimeout has elapsed after initial process death
timeout := make(chan struct{})
@@ -372,45 +374,48 @@ func Init(prepare func(prefix string), setVerbose func(verbose bool)) {
for {
select {
case s := <-sig:
- if msg.Resume() {
- msg.Verbosef("%s after process start", s.String())
+ if k.resume() {
+ k.verbosef("%s after process start", s.String())
} else {
- msg.Verbosef("got %s", s.String())
+ k.verbosef("got %s", s.String())
}
if s == CancelSignal && params.ForwardCancel && cmd.Process != nil {
- msg.Verbose("forwarding context cancellation")
- if err := cmd.Process.Signal(os.Interrupt); err != nil {
- log.Printf("cannot forward cancellation: %v", err)
+ k.verbose("forwarding context cancellation")
+ if err := k.signal(cmd, os.Interrupt); err != nil {
+ k.printf("cannot forward cancellation: %v", err)
}
continue
}
- os.Exit(0)
+ k.exit(0)
+
case w := <-info:
if w.wpid == cmd.Process.Pid {
// initial process exited, output is most likely available again
- msg.Resume()
+ k.resume()
switch {
case w.wstatus.Exited():
r = w.wstatus.ExitStatus()
- msg.Verbosef("initial process exited with code %d", w.wstatus.ExitStatus())
+ k.verbosef("initial process exited with code %d", w.wstatus.ExitStatus())
case w.wstatus.Signaled():
r = 128 + int(w.wstatus.Signal())
- msg.Verbosef("initial process exited with signal %s", w.wstatus.Signal())
+ k.verbosef("initial process exited with signal %s", w.wstatus.Signal())
default:
r = 255
- msg.Verbosef("initial process exited with status %#x", w.wstatus)
+ k.verbosef("initial process exited with status %#x", w.wstatus)
}
go func() { time.Sleep(params.AdoptWaitDelay); close(timeout) }()
}
+
case <-done:
- msg.BeforeExit()
- os.Exit(r)
+ k.beforeExit()
+ k.exit(r)
+
case <-timeout:
- log.Println("timeout exceeded waiting for lingering processes")
- msg.BeforeExit()
- os.Exit(r)
+ k.printf("timeout exceeded waiting for lingering processes")
+ k.beforeExit()
+ k.exit(r)
}
}
}
generated by cgit v1.3.1 (git 2.54.0) at 2026-08-30 05:00:49 +0000