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// Copyright 2022 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kernel
import (
"gvisor.dev/gvisor/pkg/sentry/seccheck"
pb "gvisor.dev/gvisor/pkg/sentry/seccheck/points/points_go_proto"
)
func getTaskCurrentWorkingDirectory(t *Task) string {
// Grab the filesystem context first since it needs tasks.mu to be locked.
// It's safe to unlock and use the values obtained here as long as there's
// no way to modify root and wd from a separate task.
t.k.tasks.mu.RLock()
root := t.FSContext().RootDirectory()
wd := t.FSContext().WorkingDirectory()
t.k.tasks.mu.RUnlock()
// Perform VFS operations outside of task mutex to avoid circular locking with
// filesystem mutexes.
var cwd string
if root.Ok() {
defer root.DecRef(t)
if wd.Ok() {
defer wd.DecRef(t)
vfsObj := root.Mount().Filesystem().VirtualFilesystem()
cwd, _ = vfsObj.PathnameWithDeleted(t, root, wd)
}
}
return cwd
}
// LoadSeccheckData sets info from the task based on mask.
func LoadSeccheckData(t *Task, mask seccheck.FieldMask, info *pb.ContextData) {
var cwd string
if mask.Contains(seccheck.FieldCtxtCwd) {
cwd = getTaskCurrentWorkingDirectory(t)
}
t.k.tasks.mu.RLock()
defer t.k.tasks.mu.RUnlock()
LoadSeccheckDataLocked(t, mask, info, cwd)
}
// LoadSeccheckDataLocked sets info from the task based on mask.
//
// Preconditions: The TaskSet mutex must be locked.
func LoadSeccheckDataLocked(t *Task, mask seccheck.FieldMask, info *pb.ContextData, cwd string) {
if mask.Contains(seccheck.FieldCtxtTime) {
info.TimeNs = t.k.RealtimeClock().Now().Nanoseconds()
}
if mask.Contains(seccheck.FieldCtxtThreadID) {
info.ThreadId = int32(t.k.tasks.Root.tids[t])
}
if mask.Contains(seccheck.FieldCtxtThreadStartTime) {
info.ThreadStartTimeNs = t.startTime.Nanoseconds()
}
if mask.Contains(seccheck.FieldCtxtThreadGroupID) {
info.ThreadGroupId = int32(t.k.tasks.Root.tgids[t.tg])
}
if mask.Contains(seccheck.FieldCtxtThreadGroupStartTime) {
info.ThreadGroupStartTimeNs = t.tg.leader.startTime.Nanoseconds()
}
if mask.Contains(seccheck.FieldCtxtContainerID) {
info.ContainerId = t.tg.leader.ContainerID()
}
if mask.Contains(seccheck.FieldCtxtCwd) {
info.Cwd = cwd
}
if mask.Contains(seccheck.FieldCtxtProcessName) {
info.ProcessName = t.Name()
}
t.Credentials().LoadSeccheckData(mask, info)
}
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