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diff --git a/test/util/proc_util.h b/test/util/proc_util.h
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+// 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.
+
+#ifndef GVISOR_TEST_UTIL_PROC_UTIL_H_
+#define GVISOR_TEST_UTIL_PROC_UTIL_H_
+
+#include <ostream>
+#include <string>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "test/util/fs_util.h"
+#include "test/util/posix_error.h"
+
+namespace gvisor {
+namespace testing {
+
+// ProcMapsEntry contains the data from a single line in /proc/<xxx>/maps.
+struct ProcMapsEntry {
+  uint64_t start;
+  uint64_t end;
+  bool readable;
+  bool writable;
+  bool executable;
+  bool priv;
+  uint64_t offset;
+  int major;
+  int minor;
+  int64_t inode;
+  std::string filename;
+};
+
+// Parses a ProcMaps line or returns an error.
+PosixErrorOr<ProcMapsEntry> ParseProcMapsLine(absl::string_view line);
+PosixErrorOr<std::vector<ProcMapsEntry>> ParseProcMaps(
+    absl::string_view contents);
+
+// Returns true if vsyscall (emmulation or not) is enabled.
+PosixErrorOr<bool> IsVsyscallEnabled();
+
+// Printer for ProcMapsEntry.
+inline std::ostream& operator<<(std::ostream& os, const ProcMapsEntry& entry) {
+  std::string str =
+      absl::StrCat(absl::Hex(entry.start, absl::PadSpec::kZeroPad8), "-",
+                   absl::Hex(entry.end, absl::PadSpec::kZeroPad8), " ");
+
+  absl::StrAppend(&str, entry.readable ? "r" : "-");
+  absl::StrAppend(&str, entry.writable ? "w" : "-");
+  absl::StrAppend(&str, entry.executable ? "x" : "-");
+  absl::StrAppend(&str, entry.priv ? "p" : "s");
+
+  absl::StrAppend(&str, " ", absl::Hex(entry.offset, absl::PadSpec::kZeroPad8),
+                  " ", absl::Hex(entry.major, absl::PadSpec::kZeroPad2), ":",
+                  absl::Hex(entry.minor, absl::PadSpec::kZeroPad2), " ",
+                  entry.inode);
+  if (absl::string_view(entry.filename) != "") {
+    // Pad to column 74
+    int pad = 73 - str.length();
+    if (pad > 0) {
+      absl::StrAppend(&str, std::string(pad, ' '));
+    }
+    absl::StrAppend(&str, entry.filename);
+  }
+  os << str;
+  return os;
+}
+
+// Printer for std::vector<ProcMapsEntry>.
+inline std::ostream& operator<<(std::ostream& os,
+                                const std::vector<ProcMapsEntry>& vec) {
+  for (unsigned int i = 0; i < vec.size(); i++) {
+    os << vec[i];
+    if (i != vec.size() - 1) {
+      os << "\n";
+    }
+  }
+  return os;
+}
+
+// GMock printer for std::vector<ProcMapsEntry>.
+inline void PrintTo(const std::vector<ProcMapsEntry>& vec, std::ostream* os) {
+  *os << vec;
+}
+
+// Checks that /proc/pid/maps contains all of the passed mappings.
+//
+// The major, minor, and inode fields are ignored.
+MATCHER_P(ContainsMappings, mappings,
+          "contains mappings:\n" + ::testing::PrintToString(mappings)) {
+  auto contents_or = GetContents(absl::StrCat("/proc/", arg, "/maps"));
+  if (!contents_or.ok()) {
+    *result_listener << "Unable to read mappings: "
+                     << contents_or.error().ToString();
+    return false;
+  }
+
+  auto maps_or = ParseProcMaps(contents_or.ValueOrDie());
+  if (!maps_or.ok()) {
+    *result_listener << "Unable to parse mappings: "
+                     << maps_or.error().ToString();
+    return false;
+  }
+
+  auto maps = std::move(maps_or).ValueOrDie();
+
+  // Does maps contain all elements in mappings? The comparator ignores
+  // the major, minor, and inode fields.
+  bool all_present = true;
+  std::for_each(mappings.begin(), mappings.end(), [&](const ProcMapsEntry& e1) {
+    auto it =
+        std::find_if(maps.begin(), maps.end(), [&e1](const ProcMapsEntry& e2) {
+          return e1.start == e2.start && e1.end == e2.end &&
+                 e1.readable == e2.readable && e1.writable == e2.writable &&
+                 e1.executable == e2.executable && e1.priv == e2.priv &&
+                 e1.offset == e2.offset && e1.filename == e2.filename;
+        });
+    if (it == maps.end()) {
+      // It wasn't found.
+      if (all_present) {
+        // We will output the message once and then a line for each mapping
+        // that wasn't found.
+        all_present = false;
+        *result_listener << "Got mappings:\n"
+                         << maps << "\nThat were missing:\n";
+      }
+      *result_listener << e1 << "\n";
+    }
+  });
+
+  return all_present;
+}
+
+}  // namespace testing
+}  // namespace gvisor
+
+#endif  // GVISOR_TEST_UTIL_PROC_UTIL_H_