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-rw-r--r--pkg/sentry/kernel/kernel.go10
-rw-r--r--pkg/sentry/kernel/sessions.go18
-rw-r--r--pkg/sentry/kernel/task_exec.go2
-rw-r--r--pkg/sentry/kernel/task_exit.go18
-rw-r--r--pkg/sentry/kernel/task_start.go7
-rw-r--r--pkg/sentry/kernel/threads.go24
6 files changed, 48 insertions, 31 deletions
diff --git a/pkg/sentry/kernel/kernel.go b/pkg/sentry/kernel/kernel.go
index f7f471aaa..1cd2653ff 100644
--- a/pkg/sentry/kernel/kernel.go
+++ b/pkg/sentry/kernel/kernel.go
@@ -866,14 +866,14 @@ func (k *Kernel) SendContainerSignal(cid string, info *arch.SignalInfo) error {
defer k.tasks.mu.RUnlock()
var lastErr error
- for t := range k.tasks.Root.tids {
- if t == t.tg.leader && t.ContainerID() == cid {
- t.tg.signalHandlers.mu.Lock()
- defer t.tg.signalHandlers.mu.Unlock()
+ for tg := range k.tasks.Root.tgids {
+ if tg.leader.ContainerID() == cid {
+ tg.signalHandlers.mu.Lock()
infoCopy := *info
- if err := t.sendSignalLocked(&infoCopy, true /*group*/); err != nil {
+ if err := tg.leader.sendSignalLocked(&infoCopy, true /*group*/); err != nil {
lastErr = err
}
+ tg.signalHandlers.mu.Unlock()
}
}
return lastErr
diff --git a/pkg/sentry/kernel/sessions.go b/pkg/sentry/kernel/sessions.go
index ae6daac60..65e2b73c4 100644
--- a/pkg/sentry/kernel/sessions.go
+++ b/pkg/sentry/kernel/sessions.go
@@ -240,14 +240,14 @@ func (pg *ProcessGroup) SendSignal(info *arch.SignalInfo) error {
defer tasks.mu.RUnlock()
var lastErr error
- for t := range tasks.Root.tids {
- if t == t.tg.leader && t.tg.ProcessGroup() == pg {
- t.tg.signalHandlers.mu.Lock()
- defer t.tg.signalHandlers.mu.Unlock()
+ for tg := range tasks.Root.tgids {
+ if tg.ProcessGroup() == pg {
+ tg.signalHandlers.mu.Lock()
infoCopy := *info
- if err := t.sendSignalLocked(&infoCopy, true /*group*/); err != nil {
+ if err := tg.leader.sendSignalLocked(&infoCopy, true /*group*/); err != nil {
lastErr = err
}
+ tg.signalHandlers.mu.Unlock()
}
}
return lastErr
@@ -268,7 +268,7 @@ func (tg *ThreadGroup) CreateSession() error {
// Precondition: callers must hold TaskSet.mu for writing.
func (tg *ThreadGroup) createSession() error {
// Get the ID for this thread in the current namespace.
- id := tg.pidns.tids[tg.leader]
+ id := tg.pidns.tgids[tg]
// Check if this ThreadGroup already leads a Session, or
// if the proposed group is already taken.
@@ -337,7 +337,7 @@ func (tg *ThreadGroup) createSession() error {
// Ensure a translation is added to all namespaces.
for ns := tg.pidns; ns != nil; ns = ns.parent {
- local := ns.tids[tg.leader]
+ local := ns.tgids[tg]
ns.sids[s] = SessionID(local)
ns.sessions[SessionID(local)] = s
ns.pgids[pg] = ProcessGroupID(local)
@@ -356,7 +356,7 @@ func (tg *ThreadGroup) CreateProcessGroup() error {
defer tg.pidns.owner.mu.Unlock()
// Get the ID for this thread in the current namespace.
- id := tg.pidns.tids[tg.leader]
+ id := tg.pidns.tgids[tg]
// Per above, check for a Session leader or existing group.
for s := tg.pidns.owner.sessions.Front(); s != nil; s = s.Next() {
@@ -401,7 +401,7 @@ func (tg *ThreadGroup) CreateProcessGroup() error {
// Ensure this translation is added to all namespaces.
for ns := tg.pidns; ns != nil; ns = ns.parent {
- local := ns.tids[tg.leader]
+ local := ns.tgids[tg]
ns.pgids[pg] = ProcessGroupID(local)
ns.processGroups[ProcessGroupID(local)] = pg
}
diff --git a/pkg/sentry/kernel/task_exec.go b/pkg/sentry/kernel/task_exec.go
index a9b74da8e..9fca90a1c 100644
--- a/pkg/sentry/kernel/task_exec.go
+++ b/pkg/sentry/kernel/task_exec.go
@@ -234,6 +234,8 @@ func (t *Task) promoteLocked() {
ns.tids[t] = leaderTID
ns.tasks[oldTID] = oldLeader
ns.tasks[leaderTID] = t
+ // Neither the ThreadGroup nor TGID change, so no need to
+ // update ns.tgids.
}
// Inherit the old leader's start time.
diff --git a/pkg/sentry/kernel/task_exit.go b/pkg/sentry/kernel/task_exit.go
index b9c558ccb..1a0734ab6 100644
--- a/pkg/sentry/kernel/task_exit.go
+++ b/pkg/sentry/kernel/task_exit.go
@@ -329,14 +329,15 @@ func (t *Task) exitChildren() {
// signal." - pid_namespaces(7)
t.Debugf("Init process terminating, killing namespace")
t.tg.pidns.exiting = true
- for other := range t.tg.pidns.tids {
- if other.tg != t.tg {
- other.tg.signalHandlers.mu.Lock()
- other.sendSignalLocked(&arch.SignalInfo{
- Signo: int32(linux.SIGKILL),
- }, false /* group */)
- other.tg.signalHandlers.mu.Unlock()
+ for other := range t.tg.pidns.tgids {
+ if other == t.tg {
+ continue
}
+ other.signalHandlers.mu.Lock()
+ other.leader.sendSignalLocked(&arch.SignalInfo{
+ Signo: int32(linux.SIGKILL),
+ }, true /* group */)
+ other.signalHandlers.mu.Unlock()
}
// TODO: The init process waits for all processes in the
// namespace to exit before completing its own exit
@@ -652,6 +653,9 @@ func (t *Task) exitNotifyLocked(fromPtraceDetach bool) {
tid := ns.tids[t]
delete(ns.tasks, tid)
delete(ns.tids, t)
+ if t == t.tg.leader {
+ delete(ns.tgids, t.tg)
+ }
}
t.tg.exitedCPUStats.Accumulate(t.CPUStats())
t.tg.ioUsage.Accumulate(t.ioUsage)
diff --git a/pkg/sentry/kernel/task_start.go b/pkg/sentry/kernel/task_start.go
index c82a32c78..b7534c0a2 100644
--- a/pkg/sentry/kernel/task_start.go
+++ b/pkg/sentry/kernel/task_start.go
@@ -212,11 +212,18 @@ func (ts *TaskSet) assignTIDsLocked(t *Task) error {
for _, a := range allocatedTIDs {
delete(a.ns.tasks, a.tid)
delete(a.ns.tids, t)
+ if t.tg.leader == nil {
+ delete(a.ns.tgids, t.tg)
+ }
}
return err
}
ns.tasks[tid] = t
ns.tids[t] = tid
+ if t.tg.leader == nil {
+ // New thread group.
+ ns.tgids[t.tg] = tid
+ }
allocatedTIDs = append(allocatedTIDs, allocatedTID{ns, tid})
}
return nil
diff --git a/pkg/sentry/kernel/threads.go b/pkg/sentry/kernel/threads.go
index bdb907905..4af1b7dfa 100644
--- a/pkg/sentry/kernel/threads.go
+++ b/pkg/sentry/kernel/threads.go
@@ -100,10 +100,8 @@ func newTaskSet() *TaskSet {
//
// Preconditions: ts.mu must be locked (for reading or writing).
func (ts *TaskSet) forEachThreadGroupLocked(f func(tg *ThreadGroup)) {
- for t := range ts.Root.tids {
- if t == t.tg.leader {
- f(t.tg)
- }
+ for tg := range ts.Root.tgids {
+ f(tg)
}
}
@@ -145,6 +143,13 @@ type PIDNamespace struct {
// identifiers in this namespace.
tids map[*Task]ThreadID
+ // tgids is a mapping from thread groups visible in this namespace to
+ // their identifiers in this namespace.
+ //
+ // The content of tgids is equivalent to tids[tg.leader]. This exists
+ // primarily as an optimization to quickly find all thread groups.
+ tgids map[*ThreadGroup]ThreadID
+
// sessions is a mapping from SessionIDs in this namespace to sessions
// visible in the namespace.
sessions map[SessionID]*Session
@@ -173,6 +178,7 @@ func newPIDNamespace(ts *TaskSet, parent *PIDNamespace, userns *auth.UserNamespa
userns: userns,
tasks: make(map[ThreadID]*Task),
tids: make(map[*Task]ThreadID),
+ tgids: make(map[*ThreadGroup]ThreadID),
sessions: make(map[SessionID]*Session),
sids: make(map[*Session]SessionID),
processGroups: make(map[ProcessGroupID]*ProcessGroup),
@@ -227,7 +233,7 @@ func (ns *PIDNamespace) IDOfTask(t *Task) ThreadID {
func (ns *PIDNamespace) IDOfThreadGroup(tg *ThreadGroup) ThreadID {
ns.owner.mu.RLock()
defer ns.owner.mu.RUnlock()
- return ns.tids[tg.leader]
+ return ns.tgids[tg]
}
// Tasks returns a snapshot of the tasks in ns.
@@ -250,10 +256,8 @@ func (ns *PIDNamespace) ThreadGroups() []*ThreadGroup {
func (ns *PIDNamespace) ThreadGroupsAppend(tgs []*ThreadGroup) []*ThreadGroup {
ns.owner.mu.RLock()
defer ns.owner.mu.RUnlock()
- for t := range ns.tids {
- if t == t.tg.leader {
- tgs = append(tgs, t.tg)
- }
+ for tg := range ns.tgids {
+ tgs = append(tgs, tg)
}
return tgs
}
@@ -387,7 +391,7 @@ func (tg *ThreadGroup) MemberIDs(pidns *PIDNamespace) []ThreadID {
func (tg *ThreadGroup) ID() ThreadID {
tg.pidns.owner.mu.RLock()
defer tg.pidns.owner.mu.RUnlock()
- return tg.pidns.tids[tg.leader]
+ return tg.pidns.tgids[tg]
}
// A taskNode defines the relationship between a task and the rest of the
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 12:27:08 +0000