262 lines
8.3 KiB
Go
262 lines
8.3 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package proc
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import (
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"bytes"
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"fmt"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/context"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/limits"
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"gvisor.dev/gvisor/pkg/sentry/mm"
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"gvisor.dev/gvisor/pkg/sentry/usage"
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"gvisor.dev/gvisor/pkg/sentry/usermem"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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// mapsCommon is embedded by mapsData and smapsData.
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type mapsCommon struct {
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t *kernel.Task
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}
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// mm gets the kernel task's MemoryManager. No additional reference is taken on
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// mm here. This is safe because MemoryManager.destroy is required to leave the
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// MemoryManager in a state where it's still usable as a DynamicBytesSource.
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func (md *mapsCommon) mm() *mm.MemoryManager {
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var tmm *mm.MemoryManager
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md.t.WithMuLocked(func(t *kernel.Task) {
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if mm := t.MemoryManager(); mm != nil {
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tmm = mm
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}
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})
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return tmm
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}
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// mapsData implements vfs.DynamicBytesSource for /proc/[pid]/maps.
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//
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// +stateify savable
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type mapsData struct {
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mapsCommon
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}
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var _ vfs.DynamicBytesSource = (*mapsData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (md *mapsData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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if mm := md.mm(); mm != nil {
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mm.ReadMapsDataInto(ctx, buf)
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}
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return nil
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}
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// smapsData implements vfs.DynamicBytesSource for /proc/[pid]/smaps.
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//
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// +stateify savable
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type smapsData struct {
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mapsCommon
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}
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var _ vfs.DynamicBytesSource = (*smapsData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (sd *smapsData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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if mm := sd.mm(); mm != nil {
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mm.ReadSmapsDataInto(ctx, buf)
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}
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return nil
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}
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// +stateify savable
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type taskStatData struct {
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t *kernel.Task
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// If tgstats is true, accumulate fault stats (not implemented) and CPU
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// time across all tasks in t's thread group.
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tgstats bool
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// pidns is the PID namespace associated with the proc filesystem that
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// includes the file using this statData.
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pidns *kernel.PIDNamespace
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}
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var _ vfs.DynamicBytesSource = (*taskStatData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (s *taskStatData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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fmt.Fprintf(buf, "%d ", s.pidns.IDOfTask(s.t))
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fmt.Fprintf(buf, "(%s) ", s.t.Name())
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fmt.Fprintf(buf, "%c ", s.t.StateStatus()[0])
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ppid := kernel.ThreadID(0)
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if parent := s.t.Parent(); parent != nil {
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ppid = s.pidns.IDOfThreadGroup(parent.ThreadGroup())
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}
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fmt.Fprintf(buf, "%d ", ppid)
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fmt.Fprintf(buf, "%d ", s.pidns.IDOfProcessGroup(s.t.ThreadGroup().ProcessGroup()))
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fmt.Fprintf(buf, "%d ", s.pidns.IDOfSession(s.t.ThreadGroup().Session()))
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fmt.Fprintf(buf, "0 0 " /* tty_nr tpgid */)
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fmt.Fprintf(buf, "0 " /* flags */)
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fmt.Fprintf(buf, "0 0 0 0 " /* minflt cminflt majflt cmajflt */)
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var cputime usage.CPUStats
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if s.tgstats {
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cputime = s.t.ThreadGroup().CPUStats()
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} else {
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cputime = s.t.CPUStats()
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}
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fmt.Fprintf(buf, "%d %d ", linux.ClockTFromDuration(cputime.UserTime), linux.ClockTFromDuration(cputime.SysTime))
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cputime = s.t.ThreadGroup().JoinedChildCPUStats()
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fmt.Fprintf(buf, "%d %d ", linux.ClockTFromDuration(cputime.UserTime), linux.ClockTFromDuration(cputime.SysTime))
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fmt.Fprintf(buf, "%d %d ", s.t.Priority(), s.t.Niceness())
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fmt.Fprintf(buf, "%d ", s.t.ThreadGroup().Count())
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// itrealvalue. Since kernel 2.6.17, this field is no longer
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// maintained, and is hard coded as 0.
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fmt.Fprintf(buf, "0 ")
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// Start time is relative to boot time, expressed in clock ticks.
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fmt.Fprintf(buf, "%d ", linux.ClockTFromDuration(s.t.StartTime().Sub(s.t.Kernel().Timekeeper().BootTime())))
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var vss, rss uint64
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s.t.WithMuLocked(func(t *kernel.Task) {
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if mm := t.MemoryManager(); mm != nil {
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vss = mm.VirtualMemorySize()
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rss = mm.ResidentSetSize()
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}
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})
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fmt.Fprintf(buf, "%d %d ", vss, rss/usermem.PageSize)
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// rsslim.
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fmt.Fprintf(buf, "%d ", s.t.ThreadGroup().Limits().Get(limits.Rss).Cur)
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fmt.Fprintf(buf, "0 0 0 0 0 " /* startcode endcode startstack kstkesp kstkeip */)
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fmt.Fprintf(buf, "0 0 0 0 0 " /* signal blocked sigignore sigcatch wchan */)
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fmt.Fprintf(buf, "0 0 " /* nswap cnswap */)
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terminationSignal := linux.Signal(0)
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if s.t == s.t.ThreadGroup().Leader() {
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terminationSignal = s.t.ThreadGroup().TerminationSignal()
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}
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fmt.Fprintf(buf, "%d ", terminationSignal)
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fmt.Fprintf(buf, "0 0 0 " /* processor rt_priority policy */)
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fmt.Fprintf(buf, "0 0 0 " /* delayacct_blkio_ticks guest_time cguest_time */)
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fmt.Fprintf(buf, "0 0 0 0 0 0 0 " /* start_data end_data start_brk arg_start arg_end env_start env_end */)
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fmt.Fprintf(buf, "0\n" /* exit_code */)
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return nil
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}
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// statmData implements vfs.DynamicBytesSource for /proc/[pid]/statm.
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//
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// +stateify savable
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type statmData struct {
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t *kernel.Task
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}
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var _ vfs.DynamicBytesSource = (*statmData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (s *statmData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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var vss, rss uint64
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s.t.WithMuLocked(func(t *kernel.Task) {
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if mm := t.MemoryManager(); mm != nil {
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vss = mm.VirtualMemorySize()
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rss = mm.ResidentSetSize()
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}
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})
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fmt.Fprintf(buf, "%d %d 0 0 0 0 0\n", vss/usermem.PageSize, rss/usermem.PageSize)
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return nil
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}
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// statusData implements vfs.DynamicBytesSource for /proc/[pid]/status.
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//
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// +stateify savable
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type statusData struct {
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t *kernel.Task
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pidns *kernel.PIDNamespace
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}
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var _ vfs.DynamicBytesSource = (*statusData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (s *statusData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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fmt.Fprintf(buf, "Name:\t%s\n", s.t.Name())
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fmt.Fprintf(buf, "State:\t%s\n", s.t.StateStatus())
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fmt.Fprintf(buf, "Tgid:\t%d\n", s.pidns.IDOfThreadGroup(s.t.ThreadGroup()))
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fmt.Fprintf(buf, "Pid:\t%d\n", s.pidns.IDOfTask(s.t))
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ppid := kernel.ThreadID(0)
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if parent := s.t.Parent(); parent != nil {
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ppid = s.pidns.IDOfThreadGroup(parent.ThreadGroup())
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}
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fmt.Fprintf(buf, "PPid:\t%d\n", ppid)
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tpid := kernel.ThreadID(0)
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if tracer := s.t.Tracer(); tracer != nil {
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tpid = s.pidns.IDOfTask(tracer)
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}
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fmt.Fprintf(buf, "TracerPid:\t%d\n", tpid)
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var fds int
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var vss, rss, data uint64
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s.t.WithMuLocked(func(t *kernel.Task) {
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if fdTable := t.FDTable(); fdTable != nil {
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fds = fdTable.Size()
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}
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if mm := t.MemoryManager(); mm != nil {
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vss = mm.VirtualMemorySize()
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rss = mm.ResidentSetSize()
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data = mm.VirtualDataSize()
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}
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})
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fmt.Fprintf(buf, "FDSize:\t%d\n", fds)
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fmt.Fprintf(buf, "VmSize:\t%d kB\n", vss>>10)
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fmt.Fprintf(buf, "VmRSS:\t%d kB\n", rss>>10)
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fmt.Fprintf(buf, "VmData:\t%d kB\n", data>>10)
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fmt.Fprintf(buf, "Threads:\t%d\n", s.t.ThreadGroup().Count())
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creds := s.t.Credentials()
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fmt.Fprintf(buf, "CapInh:\t%016x\n", creds.InheritableCaps)
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fmt.Fprintf(buf, "CapPrm:\t%016x\n", creds.PermittedCaps)
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fmt.Fprintf(buf, "CapEff:\t%016x\n", creds.EffectiveCaps)
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fmt.Fprintf(buf, "CapBnd:\t%016x\n", creds.BoundingCaps)
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fmt.Fprintf(buf, "Seccomp:\t%d\n", s.t.SeccompMode())
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return nil
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}
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// ioUsage is the /proc/<pid>/io and /proc/<pid>/task/<tid>/io data provider.
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type ioUsage interface {
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// IOUsage returns the io usage data.
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IOUsage() *usage.IO
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}
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// +stateify savable
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type ioData struct {
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ioUsage
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}
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var _ vfs.DynamicBytesSource = (*ioData)(nil)
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// Generate implements vfs.DynamicBytesSource.Generate.
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func (i *ioData) Generate(ctx context.Context, buf *bytes.Buffer) error {
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io := usage.IO{}
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io.Accumulate(i.IOUsage())
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fmt.Fprintf(buf, "char: %d\n", io.CharsRead)
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fmt.Fprintf(buf, "wchar: %d\n", io.CharsWritten)
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fmt.Fprintf(buf, "syscr: %d\n", io.ReadSyscalls)
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fmt.Fprintf(buf, "syscw: %d\n", io.WriteSyscalls)
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fmt.Fprintf(buf, "read_bytes: %d\n", io.BytesRead)
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fmt.Fprintf(buf, "write_bytes: %d\n", io.BytesWritten)
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fmt.Fprintf(buf, "cancelled_write_bytes: %d\n", io.BytesWriteCancelled)
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return nil
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}
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