Implement close_range.

Fixes #5500

PiperOrigin-RevId: 431454836

pkg/sentry/strace/BUILD

@@ -7,6 +7,7 @@ go_library(
     srcs = [
         "capability.go",
         "clone.go",
+        "close_range.go",
         "epoll.go",
         "futex.go",
         "linux64_amd64.go",

pkg/sentry/strace/close_range.go

@@ -0,0 +1,32 @@
+// Copyright 2022 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 strace
+
+import (
+	"gvisor.dev/gvisor/pkg/abi"
+	"gvisor.dev/gvisor/pkg/abi/linux"
+)
+
+// CloseRangeFlagSet is the set of close_range(2) flags.
+var CloseRangeFlagSet = abi.FlagSet{
+	{
+		Flag: uint64(linux.CLOSE_RANGE_CLOEXEC),
+		Name: "CLOSE_RANGE_CLOEXEC",
+	},
+	{
+		Flag: uint64(linux.CLOSE_RANGE_UNSHARE),
+		Name: "CLOSE_RANGE_UNSHARE",
+	},
+}

pkg/sentry/strace/linux64_amd64.go

@@ -372,6 +372,7 @@ var linuxAMD64 = SyscallMap{
 	433: makeSyscallInfo("fspick", FD, Path, Hex),
 	434: makeSyscallInfo("pidfd_open", Hex, Hex),
 	435: makeSyscallInfo("clone3", Hex, Hex),
+	436: makeSyscallInfo("close_range", FD, FD, CloseRangeFlags),
 	441: makeSyscallInfo("epoll_pwait2", FD, EpollEvents, Hex, Timespec, SigSet),
 }
 

pkg/sentry/strace/linux64_arm64.go

@@ -313,6 +313,7 @@ var linuxARM64 = SyscallMap{
 	433: makeSyscallInfo("fspick", FD, Path, Hex),
 	434: makeSyscallInfo("pidfd_open", Hex, Hex),
 	435: makeSyscallInfo("clone3", Hex, Hex),
+	436: makeSyscallInfo("close_range", FD, FD, CloseRangeFlags),
 	441: makeSyscallInfo("epoll_pwait2", FD, EpollEvents, Hex, Timespec, SigSet),
 }
 

pkg/sentry/strace/strace.go

@@ -496,6 +496,8 @@ func (i *SyscallInfo) pre(t *kernel.Task, args arch.SyscallArguments, maximumBlo
 			output = append(output, ProtectionFlagSet.Parse(uint64(args[arg].Uint())))
 		case MmapFlags:
 			output = append(output, MmapFlagSet.Parse(uint64(args[arg].Uint())))
+		case CloseRangeFlags:
+			output = append(output, CloseRangeFlagSet.Parse(uint64(args[arg].Uint())))
 		case Oct:
 			output = append(output, "0o"+strconv.FormatUint(args[arg].Uint64(), 8))
 		case Hex:

pkg/sentry/strace/syscalls.go

@@ -244,6 +244,9 @@ const (
 
 	// MmapFlags is the flags argument in mmap(2).
 	MmapFlags
+
+	// CloseRangeFlags are close_range(2) flags.
+	CloseRangeFlags
 )
 
 // defaultFormat is the syscall argument format to use if the actual format is