tests: add TestDiskFull
Also fix incomplete uid restoration in TestSupplementaryGroups and replace syscall.Setregid and friends with unix.Setregid and friends. This test is added to check if have problems handling a full disk. The ticket https://github.com/rfjakob/gocryptfs/issues/550 states that the full disk was not where the backing gocryptfs filesystem was, but this has no effect on gocryptfs, so we test the harder case.
This commit is contained in:
Jakob Unterwurzacher
parent
d47bf9976f
commit
952d45ce84
@ -85,8 +85,7 @@ if grep -R "panic(" ./*.go internal ; then
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fi
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# All functions from the commit msg in https://go-review.googlesource.com/c/go/+/210639
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if grep -R -E 'syscall.(Setegid|Seteuid|Setgroups|Setgid|Setregid|Setreuid|Setresgid|Setresuid|Setuid)\(' \
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./*.go internal ; then
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if find . -type f -name \*.go -print0 | xargs -0 grep -E 'syscall.(Setegid|Seteuid|Setgroups|Setgid|Setregid|Setreuid|Setresgid|Setresuid|Setuid)\(' ; then
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echo "$MYNAME: You probably want to use unix.Setgroups and friends. See the comments in OpenatUser() for why."
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exit 1
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fi
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@ -9,6 +9,7 @@ import (
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"os/exec"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"testing"
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"time"
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@ -869,3 +870,35 @@ func TestSharedstorage(t *testing.T) {
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t.Fatal(st2.Size)
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}
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}
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// Test that the filesystem is immediately ready for Creat() after mount returns
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func TestMountCreat(t *testing.T) {
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const concurrency = 2
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const repeat = 2
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dir := test_helpers.InitFS(t)
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mnt := dir + ".mnt"
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err := os.Mkdir(mnt, 0700)
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if err != nil {
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t.Fatal(err)
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}
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for j := 0; j < repeat; j++ {
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test_helpers.MountOrFatal(t, dir, mnt, "-extpass=echo test")
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var wg sync.WaitGroup
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wg.Add(concurrency)
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for i := 0; i < concurrency; i++ {
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go func(i int) {
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path := fmt.Sprintf("%s/%d", mnt, i)
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fd, err := syscall.Creat(path, 0600)
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syscall.Close(fd)
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if err != nil {
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t.Errorf("Creat %q: %v", path, err)
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}
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wg.Done()
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}(i)
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}
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wg.Wait()
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test_helpers.UnmountPanic(mnt)
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}
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}
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@ -1,11 +1,19 @@
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// Package root_test contains tests that need root
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// permissions to run
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package root_test
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import (
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"sync"
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"syscall"
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"testing"
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"golang.org/x/sys/unix"
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"github.com/rfjakob/gocryptfs/tests/test_helpers"
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)
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@ -13,25 +21,57 @@ func asUser(uid int, gid int, supplementaryGroups []int, f func() error) error {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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err := syscall.Setgroups(supplementaryGroups)
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err := unix.Setgroups(supplementaryGroups)
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if err != nil {
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return err
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}
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defer syscall.Setgroups(nil)
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err = syscall.Setregid(-1, gid)
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defer func() {
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err = unix.Setgroups(nil)
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if err != nil {
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panic(err)
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}
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}()
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err = unix.Setregid(-1, gid)
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if err != nil {
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return err
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}
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defer syscall.Setregid(-1, 0)
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err = syscall.Setreuid(-1, uid)
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defer func() {
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err = unix.Setregid(-1, 0)
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if err != nil {
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panic(err)
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}
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}()
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err = unix.Setreuid(-1, uid)
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if err != nil {
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return err
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}
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defer syscall.Setreuid(-1, 0)
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defer func() {
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err = unix.Setreuid(-1, 0)
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if err != nil {
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panic(err)
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}
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}()
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return f()
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ret := f()
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// Also reset the saved user id (suid) and saved group id (sgid) to prevent
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// bizarre failures in later tests.
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//
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// Yes, the kernel checks that *all of them* match:
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// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/fuse/dir.c?h=v5.12-rc2#n1193
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//
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// How to check:
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// ps -o tid,pid,euid,ruid,suid,egid,rgid,sgid,cmd -eL
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err = unix.Setresuid(0, 0, 0)
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if err != nil {
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panic(err)
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}
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err = unix.Setresgid(0, 0, 0)
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if err != nil {
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panic(err)
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}
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return ret
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}
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func TestSupplementaryGroups(t *testing.T) {
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@ -73,3 +113,123 @@ func TestSupplementaryGroups(t *testing.T) {
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t.Error(err)
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}
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}
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func writeTillFull(t *testing.T, path string) (int, syscall.Errno) {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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fd, err := syscall.Creat(path, 0600)
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if err != nil {
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return 0, err.(syscall.Errno)
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}
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defer syscall.Close(fd)
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// Write in 100.000 byte-blocks, which is not aligend to the
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// underlying block size
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buf := make([]byte, 100000)
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var sz int
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for {
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n, err := syscall.Write(fd, buf)
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if err != nil {
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return sz, err.(syscall.Errno)
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}
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sz += n
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}
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return sz, 0
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}
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func TestDiskFull(t *testing.T) {
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if os.Getuid() != 0 {
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t.Skip("must run as root")
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}
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// Create 10 MB file full of zeros
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ext4img := filepath.Join(test_helpers.TmpDir, t.Name()+".ext4")
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f, err := os.Create(ext4img)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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err = f.Truncate(10 * 1024 * 1024)
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if err != nil {
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t.Fatal(err)
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}
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// Format as ext4
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cmd := exec.Command("mkfs.ext4", ext4img)
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Log(string(out))
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t.Fatal(err)
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}
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// Mount ext4
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ext4mnt := ext4img + ".mnt"
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err = os.Mkdir(ext4mnt, 0600)
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if err != nil {
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t.Fatal(err)
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}
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cmd = exec.Command("mount", ext4img, ext4mnt)
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out, err = cmd.CombinedOutput()
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if err != nil {
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t.Log(string(out))
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t.Fatal(err)
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}
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defer syscall.Unlink(ext4img)
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defer syscall.Unmount(ext4mnt, 0)
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// gocryptfs -init
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cipherdir := ext4mnt + "/a"
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if err = os.Mkdir(cipherdir, 0600); err != nil {
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t.Fatal(err)
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}
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cmd = exec.Command(test_helpers.GocryptfsBinary, "-q", "-init", "-extpass", "echo test", "-scryptn=10", cipherdir)
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out, err = cmd.CombinedOutput()
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if err != nil {
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t.Log(string(out))
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t.Fatal(err)
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}
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// Mount gocryptfs
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mnt := ext4mnt + "/b"
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err = os.Mkdir(mnt, 0600)
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if err != nil {
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t.Fatal(err)
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}
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test_helpers.MountOrFatal(t, cipherdir, mnt, "-extpass", "echo test")
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defer test_helpers.UnmountPanic(mnt)
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// Write till we get ENOSPC
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var err1, err2 error
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var sz1, sz2 int
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var wg sync.WaitGroup
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wg.Add(2)
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go func() {
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sz1, err1 = writeTillFull(t, mnt+"/foo1")
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wg.Done()
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}()
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go func() {
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sz2, err2 = writeTillFull(t, mnt+"/foo2")
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wg.Done()
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}()
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wg.Wait()
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if err1 != syscall.ENOSPC || err2 != syscall.ENOSPC {
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t.Fatalf("err1=%v, err2=%v", err1, err2)
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}
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t.Logf("sz1=%d, sz2=%d", sz1, sz2)
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foo1, err := ioutil.ReadFile(mnt + "/foo1")
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if err != nil {
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t.Fatal(err)
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}
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if len(foo1) != sz1 {
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t.Fail()
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}
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foo2, err := ioutil.ReadFile(mnt + "/foo2")
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if err != nil {
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t.Fatal(err)
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}
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if len(foo2) != sz2 {
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t.Fail()
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}
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}
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