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// Copyright 2019 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 disklayout
import (
"fmt"
"strconv"
"testing"
"gvisor.dev/gvisor/pkg/sentry/kernel/time"
)
// TestInodeSize tests that the inode structs are of the correct size.
func TestInodeSize(t *testing.T) {
assertSize(t, InodeOld{}, oldInodeSize)
// This was updated from 156 bytes to 160 bytes in Oct 2015.
assertSize(t, InodeNew{}, 160)
}
// TestTimestampSeconds tests that the seconds part of [a/c/m] timestamps in
// ext4 inode structs are decoded correctly.
//
// These tests are derived from the table under https://www.kernel.org/doc/html/latest/filesystems/ext4/dynamic.html#inode-timestamps.
func TestTimestampSeconds(t *testing.T) {
type timestampTest struct {
// msbSet tells if the most significant bit of InodeOld.[X]TimeRaw is set.
// If this is set then the 32-bit time is negative.
msbSet bool
// lowerBound tells if we should take the lowest possible value of
// InodeOld.[X]TimeRaw while satisfying test.msbSet condition. If set to
// false it tells to take the highest possible value.
lowerBound bool
// extraBits is InodeNew.[X]TimeExtra.
extraBits uint32
// want is the kernel time struct that is expected.
want time.Time
}
tests := []timestampTest{
// 1901-12-13
{
msbSet: true,
lowerBound: true,
extraBits: 0,
want: time.FromUnix(int64(-0x80000000), 0),
},
// 1969-12-31
{
msbSet: true,
lowerBound: false,
extraBits: 0,
want: time.FromUnix(int64(-1), 0),
},
// 1970-01-01
{
msbSet: false,
lowerBound: true,
extraBits: 0,
want: time.FromUnix(int64(0), 0),
},
// 2038-01-19
{
msbSet: false,
lowerBound: false,
extraBits: 0,
want: time.FromUnix(int64(0x7fffffff), 0),
},
// 2038-01-19
{
msbSet: true,
lowerBound: true,
extraBits: 1,
want: time.FromUnix(int64(0x80000000), 0),
},
// 2106-02-07
{
msbSet: true,
lowerBound: false,
extraBits: 1,
want: time.FromUnix(int64(0xffffffff), 0),
},
// 2106-02-07
{
msbSet: false,
lowerBound: true,
extraBits: 1,
want: time.FromUnix(int64(0x100000000), 0),
},
// 2174-02-25
{
msbSet: false,
lowerBound: false,
extraBits: 1,
want: time.FromUnix(int64(0x17fffffff), 0),
},
// 2174-02-25
{
msbSet: true,
lowerBound: true,
extraBits: 2,
want: time.FromUnix(int64(0x180000000), 0),
},
// 2242-03-16
{
msbSet: true,
lowerBound: false,
extraBits: 2,
want: time.FromUnix(int64(0x1ffffffff), 0),
},
// 2242-03-16
{
msbSet: false,
lowerBound: true,
extraBits: 2,
want: time.FromUnix(int64(0x200000000), 0),
},
// 2310-04-04
{
msbSet: false,
lowerBound: false,
extraBits: 2,
want: time.FromUnix(int64(0x27fffffff), 0),
},
// 2310-04-04
{
msbSet: true,
lowerBound: true,
extraBits: 3,
want: time.FromUnix(int64(0x280000000), 0),
},
// 2378-04-22
{
msbSet: true,
lowerBound: false,
extraBits: 3,
want: time.FromUnix(int64(0x2ffffffff), 0),
},
// 2378-04-22
{
msbSet: false,
lowerBound: true,
extraBits: 3,
want: time.FromUnix(int64(0x300000000), 0),
},
// 2446-05-10
{
msbSet: false,
lowerBound: false,
extraBits: 3,
want: time.FromUnix(int64(0x37fffffff), 0),
},
}
lowerMSB0 := int32(0) // binary: 00000000 00000000 00000000 00000000
upperMSB0 := int32(0x7fffffff) // binary: 01111111 11111111 11111111 11111111
lowerMSB1 := int32(-0x80000000) // binary: 10000000 00000000 00000000 00000000
upperMSB1 := int32(-1) // binary: 11111111 11111111 11111111 11111111
get32BitTime := func(test timestampTest) int32 {
if test.msbSet {
if test.lowerBound {
return lowerMSB1
}
return upperMSB1
}
if test.lowerBound {
return lowerMSB0
}
return upperMSB0
}
getTestName := func(test timestampTest) string {
return fmt.Sprintf(
"Tests time decoding with epoch bits 0b%s and 32-bit raw time: MSB set=%t, lower bound=%t",
strconv.FormatInt(int64(test.extraBits), 2),
test.msbSet,
test.lowerBound,
)
}
for _, test := range tests {
t.Run(getTestName(test), func(t *testing.T) {
if got := fromExtraTime(get32BitTime(test), test.extraBits); got != test.want {
t.Errorf("Expected: %v, Got: %v", test.want, got)
}
})
}
}
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