2019-07-03 02:27:51 +00:00
|
|
|
// Copyright 2018 Google LLC
|
|
|
|
//
|
|
|
|
// 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 (
|
|
|
|
"runtime"
|
|
|
|
"sync"
|
|
|
|
"testing"
|
|
|
|
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/context"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/context/contexttest"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/fs"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/fs/filetest"
|
|
|
|
"gvisor.dev/gvisor/pkg/sentry/limits"
|
|
|
|
)
|
|
|
|
|
|
|
|
const (
|
|
|
|
// maxFD is the maximum FD to try to create in the map.
|
|
|
|
//
|
|
|
|
// This number of open files has been seen in the wild.
|
|
|
|
maxFD = 2 * 1024
|
|
|
|
)
|
|
|
|
|
|
|
|
func runTest(t testing.TB, fn func(ctx context.Context, fdTable *FDTable, file *fs.File, limitSet *limits.LimitSet)) {
|
|
|
|
t.Helper() // Don't show in stacks.
|
|
|
|
|
|
|
|
// Create the limits and context.
|
|
|
|
limitSet := limits.NewLimitSet()
|
|
|
|
limitSet.Set(limits.NumberOfFiles, limits.Limit{maxFD, maxFD}, true)
|
|
|
|
ctx := contexttest.WithLimitSet(contexttest.Context(t), limitSet)
|
|
|
|
|
|
|
|
// Create a test file.;
|
|
|
|
file := filetest.NewTestFile(t)
|
|
|
|
|
|
|
|
// Create the table.
|
|
|
|
fdTable := new(FDTable)
|
|
|
|
fdTable.init()
|
|
|
|
|
|
|
|
// Run the test.
|
|
|
|
fn(ctx, fdTable, file, limitSet)
|
|
|
|
}
|
|
|
|
|
|
|
|
// TestFDTableMany allocates maxFD FDs, i.e. maxes out the FDTable, until there
|
|
|
|
// is no room, then makes sure that NewFDAt works and also that if we remove
|
|
|
|
// one and add one that works too.
|
|
|
|
func TestFDTableMany(t *testing.T) {
|
|
|
|
runTest(t, func(ctx context.Context, fdTable *FDTable, file *fs.File, _ *limits.LimitSet) {
|
|
|
|
for i := 0; i < maxFD; i++ {
|
|
|
|
if _, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("Allocated %v FDs but wanted to allocate %v", i, maxFD)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if _, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err == nil {
|
|
|
|
t.Fatalf("fdTable.NewFDs(0, r) in full map: got nil, wanted error")
|
|
|
|
}
|
|
|
|
|
|
|
|
if err := fdTable.NewFDAt(ctx, 1, file, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("fdTable.NewFDAt(1, r, FDFlags{}): got %v, wanted nil", err)
|
|
|
|
}
|
2019-10-23 21:26:23 +00:00
|
|
|
|
|
|
|
i := int32(2)
|
|
|
|
fdTable.Remove(i)
|
|
|
|
if fds, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err != nil || fds[0] != i {
|
|
|
|
t.Fatalf("Allocated %v FDs but wanted to allocate %v: %v", i, maxFD, err)
|
|
|
|
}
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestFDTableOverLimit(t *testing.T) {
|
|
|
|
runTest(t, func(ctx context.Context, fdTable *FDTable, file *fs.File, _ *limits.LimitSet) {
|
|
|
|
if _, err := fdTable.NewFDs(ctx, maxFD, []*fs.File{file}, FDFlags{}); err == nil {
|
|
|
|
t.Fatalf("fdTable.NewFDs(maxFD, f): got nil, wanted error")
|
|
|
|
}
|
|
|
|
|
|
|
|
if _, err := fdTable.NewFDs(ctx, maxFD-2, []*fs.File{file, file, file}, FDFlags{}); err == nil {
|
|
|
|
t.Fatalf("fdTable.NewFDs(maxFD-2, {f,f,f}): got nil, wanted error")
|
|
|
|
}
|
|
|
|
|
|
|
|
if fds, err := fdTable.NewFDs(ctx, maxFD-3, []*fs.File{file, file, file}, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("fdTable.NewFDs(maxFD-3, {f,f,f}): got %v, wanted nil", err)
|
|
|
|
} else {
|
|
|
|
for _, fd := range fds {
|
|
|
|
fdTable.Remove(fd)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if fds, err := fdTable.NewFDs(ctx, maxFD-1, []*fs.File{file}, FDFlags{}); err != nil || fds[0] != maxFD-1 {
|
|
|
|
t.Fatalf("fdTable.NewFDAt(1, r, FDFlags{}): got %v, wanted nil", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
if fds, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("Adding an FD to a resized map: got %v, want nil", err)
|
|
|
|
} else if len(fds) != 1 || fds[0] != 0 {
|
|
|
|
t.Fatalf("Added an FD to a resized map: got %v, want {1}", fds)
|
|
|
|
}
|
2019-07-03 02:27:51 +00:00
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
// TestFDTable does a set of simple tests to make sure simple adds, removes,
|
|
|
|
// GetRefs, and DecRefs work. The ordering is just weird enough that a
|
|
|
|
// table-driven approach seemed clumsy.
|
|
|
|
func TestFDTable(t *testing.T) {
|
|
|
|
runTest(t, func(ctx context.Context, fdTable *FDTable, file *fs.File, limitSet *limits.LimitSet) {
|
|
|
|
// Cap the limit at one.
|
|
|
|
limitSet.Set(limits.NumberOfFiles, limits.Limit{1, maxFD}, true)
|
|
|
|
|
|
|
|
if _, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("Adding an FD to an empty 1-size map: got %v, want nil", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
if _, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err == nil {
|
|
|
|
t.Fatalf("Adding an FD to a filled 1-size map: got nil, wanted an error")
|
|
|
|
}
|
|
|
|
|
|
|
|
// Remove the previous limit.
|
|
|
|
limitSet.Set(limits.NumberOfFiles, limits.Limit{maxFD, maxFD}, true)
|
|
|
|
|
|
|
|
if fds, err := fdTable.NewFDs(ctx, 0, []*fs.File{file}, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("Adding an FD to a resized map: got %v, want nil", err)
|
|
|
|
} else if len(fds) != 1 || fds[0] != 1 {
|
|
|
|
t.Fatalf("Added an FD to a resized map: got %v, want {1}", fds)
|
|
|
|
}
|
|
|
|
|
|
|
|
if err := fdTable.NewFDAt(ctx, 1, file, FDFlags{}); err != nil {
|
|
|
|
t.Fatalf("Replacing FD 1 via fdTable.NewFDAt(1, r, FDFlags{}): got %v, wanted nil", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
if err := fdTable.NewFDAt(ctx, maxFD+1, file, FDFlags{}); err == nil {
|
|
|
|
t.Fatalf("Using an FD that was too large via fdTable.NewFDAt(%v, r, FDFlags{}): got nil, wanted an error", maxFD+1)
|
|
|
|
}
|
|
|
|
|
|
|
|
if ref, _ := fdTable.Get(1); ref == nil {
|
|
|
|
t.Fatalf("fdTable.Get(1): got nil, wanted %v", file)
|
|
|
|
}
|
|
|
|
|
|
|
|
if ref, _ := fdTable.Get(2); ref != nil {
|
|
|
|
t.Fatalf("fdTable.Get(2): got a %v, wanted nil", ref)
|
|
|
|
}
|
|
|
|
|
|
|
|
ref := fdTable.Remove(1)
|
|
|
|
if ref == nil {
|
|
|
|
t.Fatalf("fdTable.Remove(1) for an existing FD: failed, want success")
|
|
|
|
}
|
|
|
|
ref.DecRef()
|
|
|
|
|
|
|
|
if ref := fdTable.Remove(1); ref != nil {
|
|
|
|
t.Fatalf("r.Remove(1) for a removed FD: got success, want failure")
|
|
|
|
}
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestDescriptorFlags(t *testing.T) {
|
|
|
|
runTest(t, func(ctx context.Context, fdTable *FDTable, file *fs.File, _ *limits.LimitSet) {
|
|
|
|
if err := fdTable.NewFDAt(ctx, 2, file, FDFlags{CloseOnExec: true}); err != nil {
|
|
|
|
t.Fatalf("fdTable.NewFDAt(2, r, FDFlags{}): got %v, wanted nil", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
newFile, flags := fdTable.Get(2)
|
|
|
|
if newFile == nil {
|
|
|
|
t.Fatalf("fdTable.Get(2): got a %v, wanted nil", newFile)
|
|
|
|
}
|
|
|
|
|
|
|
|
if !flags.CloseOnExec {
|
|
|
|
t.Fatalf("new File flags %v don't match original %d\n", flags, 0)
|
|
|
|
}
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
func BenchmarkFDLookupAndDecRef(b *testing.B) {
|
|
|
|
b.StopTimer() // Setup.
|
|
|
|
|
|
|
|
runTest(b, func(ctx context.Context, fdTable *FDTable, file *fs.File, _ *limits.LimitSet) {
|
|
|
|
fds, err := fdTable.NewFDs(ctx, 0, []*fs.File{file, file, file, file, file}, FDFlags{})
|
|
|
|
if err != nil {
|
|
|
|
b.Fatalf("fdTable.NewFDs: got %v, wanted nil", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
b.StartTimer() // Benchmark.
|
|
|
|
for i := 0; i < b.N; i++ {
|
|
|
|
tf, _ := fdTable.Get(fds[i%len(fds)])
|
|
|
|
tf.DecRef()
|
|
|
|
}
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
func BenchmarkFDLookupAndDecRefConcurrent(b *testing.B) {
|
|
|
|
b.StopTimer() // Setup.
|
|
|
|
|
|
|
|
runTest(b, func(ctx context.Context, fdTable *FDTable, file *fs.File, _ *limits.LimitSet) {
|
|
|
|
fds, err := fdTable.NewFDs(ctx, 0, []*fs.File{file, file, file, file, file}, FDFlags{})
|
|
|
|
if err != nil {
|
|
|
|
b.Fatalf("fdTable.NewFDs: got %v, wanted nil", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
concurrency := runtime.GOMAXPROCS(0)
|
|
|
|
if concurrency < 4 {
|
|
|
|
concurrency = 4
|
|
|
|
}
|
|
|
|
each := b.N / concurrency
|
|
|
|
|
|
|
|
b.StartTimer() // Benchmark.
|
|
|
|
var wg sync.WaitGroup
|
|
|
|
for i := 0; i < concurrency; i++ {
|
|
|
|
wg.Add(1)
|
|
|
|
go func() {
|
|
|
|
defer wg.Done()
|
|
|
|
for i := 0; i < each; i++ {
|
|
|
|
tf, _ := fdTable.Get(fds[i%len(fds)])
|
|
|
|
tf.DecRef()
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
}
|
|
|
|
wg.Wait()
|
|
|
|
})
|
|
|
|
}
|