Merge 216da0b7 (automated)

1 files changed, 79 insertions, 0 deletions

diff --git a/pkg/sentry/syscalls/linux/sys_pipe.go b/pkg/sentry/syscalls/linux/sys_pipe.go
new file mode 100644
index 000000000..036845c13
--- /dev/null
+++ b/pkg/sentry/syscalls/linux/sys_pipe.go
@@ -0,0 +1,79 @@
+// 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 linux
+
+import (
+	"syscall"
+
+	"gvisor.googlesource.com/gvisor/pkg/abi/linux"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/kdefs"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/pipe"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
+)
+
+// pipe2 implements the actual system call with flags.
+func pipe2(t *kernel.Task, addr usermem.Addr, flags uint) (uintptr, error) {
+	if flags&^(linux.O_NONBLOCK|linux.O_CLOEXEC) != 0 {
+		return 0, syscall.EINVAL
+	}
+	r, w := pipe.NewConnectedPipe(t, pipe.DefaultPipeSize, usermem.PageSize)
+
+	r.SetFlags(linuxToFlags(flags).Settable())
+	defer r.DecRef()
+
+	w.SetFlags(linuxToFlags(flags).Settable())
+	defer w.DecRef()
+
+	rfd, err := t.FDMap().NewFDFrom(0, r, kernel.FDFlags{
+		CloseOnExec: flags&linux.O_CLOEXEC != 0},
+		t.ThreadGroup().Limits())
+	if err != nil {
+		return 0, err
+	}
+
+	wfd, err := t.FDMap().NewFDFrom(0, w, kernel.FDFlags{
+		CloseOnExec: flags&linux.O_CLOEXEC != 0},
+		t.ThreadGroup().Limits())
+	if err != nil {
+		t.FDMap().Remove(rfd)
+		return 0, err
+	}
+
+	if _, err := t.CopyOut(addr, []kdefs.FD{rfd, wfd}); err != nil {
+		t.FDMap().Remove(rfd)
+		t.FDMap().Remove(wfd)
+		return 0, syscall.EFAULT
+	}
+	return 0, nil
+}
+
+// Pipe implements linux syscall pipe(2).
+func Pipe(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+	addr := args[0].Pointer()
+
+	n, err := pipe2(t, addr, 0)
+	return n, nil, err
+}
+
+// Pipe2 implements linux syscall pipe2(2).
+func Pipe2(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
+	addr := args[0].Pointer()
+	flags := uint(args[1].Uint())
+
+	n, err := pipe2(t, addr, flags)
+	return n, nil, err
+}