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-rwxr-xr-xpkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go6
-rwxr-xr-xpkg/sentry/syscalls/linux/vfs2/sys_timerfd.go123
2 files changed, 126 insertions, 3 deletions
diff --git a/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go b/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go
index 7d220bc20..63febc2f7 100755
--- a/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go
+++ b/pkg/sentry/syscalls/linux/vfs2/linux64_override_amd64.go
@@ -139,11 +139,11 @@ func Override(table map[uintptr]kernel.Syscall) {
table[280] = syscalls.Supported("utimensat", Utimensat)
table[281] = syscalls.Supported("epoll_pwait", EpollPwait)
delete(table, 282) // signalfd
- delete(table, 283) // timerfd_create
+ table[283] = syscalls.Supported("timerfd_create", TimerfdCreate)
delete(table, 284) // eventfd
delete(table, 285) // fallocate
- delete(table, 286) // timerfd_settime
- delete(table, 287) // timerfd_gettime
+ table[286] = syscalls.Supported("timerfd_settime", TimerfdSettime)
+ table[287] = syscalls.Supported("timerfd_gettime", TimerfdGettime)
delete(table, 288) // accept4
delete(table, 289) // signalfd4
delete(table, 290) // eventfd2
diff --git a/pkg/sentry/syscalls/linux/vfs2/sys_timerfd.go b/pkg/sentry/syscalls/linux/vfs2/sys_timerfd.go
new file mode 100755
index 000000000..7938a5249
--- /dev/null
+++ b/pkg/sentry/syscalls/linux/vfs2/sys_timerfd.go
@@ -0,0 +1,123 @@
+// Copyright 2018 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 vfs2
+
+import (
+ "gvisor.dev/gvisor/pkg/abi/linux"
+ "gvisor.dev/gvisor/pkg/sentry/arch"
+ "gvisor.dev/gvisor/pkg/sentry/kernel"
+ ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
+ "gvisor.dev/gvisor/pkg/sentry/vfs"
+ "gvisor.dev/gvisor/pkg/syserror"
+)
+
+// TimerfdCreate implements Linux syscall timerfd_create(2).
+func TimerfdCreate(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+ clockID := args[0].Int()
+ flags := args[1].Int()
+
+ if flags&^(linux.TFD_CLOEXEC|linux.TFD_NONBLOCK) != 0 {
+ return 0, nil, syserror.EINVAL
+ }
+
+ var fileFlags uint32
+ if flags&linux.TFD_NONBLOCK != 0 {
+ fileFlags = linux.O_NONBLOCK
+ }
+
+ var clock ktime.Clock
+ switch clockID {
+ case linux.CLOCK_REALTIME:
+ clock = t.Kernel().RealtimeClock()
+ case linux.CLOCK_MONOTONIC, linux.CLOCK_BOOTTIME:
+ clock = t.Kernel().MonotonicClock()
+ default:
+ return 0, nil, syserror.EINVAL
+ }
+ file, err := t.Kernel().VFS().NewTimerFD(clock, fileFlags)
+ if err != nil {
+ return 0, nil, err
+ }
+ defer file.DecRef()
+ fd, err := t.NewFDFromVFS2(0, file, kernel.FDFlags{
+ CloseOnExec: flags&linux.TFD_CLOEXEC != 0,
+ })
+ if err != nil {
+ return 0, nil, err
+ }
+ return uintptr(fd), nil, nil
+}
+
+// TimerfdSettime implements Linux syscall timerfd_settime(2).
+func TimerfdSettime(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+ fd := args[0].Int()
+ flags := args[1].Int()
+ newValAddr := args[2].Pointer()
+ oldValAddr := args[3].Pointer()
+
+ if flags&^(linux.TFD_TIMER_ABSTIME) != 0 {
+ return 0, nil, syserror.EINVAL
+ }
+
+ file := t.GetFileVFS2(fd)
+ if file == nil {
+ return 0, nil, syserror.EBADF
+ }
+ defer file.DecRef()
+
+ tfd, ok := file.Impl().(*vfs.TimerFileDescription)
+ if !ok {
+ return 0, nil, syserror.EINVAL
+ }
+
+ var newVal linux.Itimerspec
+ if _, err := t.CopyIn(newValAddr, &newVal); err != nil {
+ return 0, nil, err
+ }
+ newS, err := ktime.SettingFromItimerspec(newVal, flags&linux.TFD_TIMER_ABSTIME != 0, tfd.Clock())
+ if err != nil {
+ return 0, nil, err
+ }
+ tm, oldS := tfd.SetTime(newS)
+ if oldValAddr != 0 {
+ oldVal := ktime.ItimerspecFromSetting(tm, oldS)
+ if _, err := t.CopyOut(oldValAddr, &oldVal); err != nil {
+ return 0, nil, err
+ }
+ }
+ return 0, nil, nil
+}
+
+// TimerfdGettime implements Linux syscall timerfd_gettime(2).
+func TimerfdGettime(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+ fd := args[0].Int()
+ curValAddr := args[1].Pointer()
+
+ file := t.GetFileVFS2(fd)
+ if file == nil {
+ return 0, nil, syserror.EBADF
+ }
+ defer file.DecRef()
+
+ tfd, ok := file.Impl().(*vfs.TimerFileDescription)
+ if !ok {
+ return 0, nil, syserror.EINVAL
+ }
+
+ tm, s := tfd.GetTime()
+ curVal := ktime.ItimerspecFromSetting(tm, s)
+ _, err := t.CopyOut(curValAddr, &curVal)
+ return 0, nil, err
+}