From 40b6245167d23f108f4df82c2dcc54331e30cf60 Mon Sep 17 00:00:00 2001
From: Peter Levine <plevine457@gmail.com>
Date: Sat, 15 Jun 2019 16:48:42 -0400
Subject: [PATCH] Add MAP_GROWSDOWN flag to mmap in Linux for correct stack
 resizing

---
 googletest/src/gtest-death-test.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/googletest/src/gtest-death-test.cc b/googletest/src/gtest-death-test.cc
index 350e6109de..cf0e98ddc1 100644
--- a/googletest/src/gtest-death-test.cc
+++ b/googletest/src/gtest-death-test.cc
@@ -1357,6 +1357,10 @@ static pid_t ExecDeathTestSpawnChild(char* const* argv, int close_fd) {
     const auto stack_size = static_cast<size_t>(getpagesize());
     // MMAP_ANONYMOUS is not defined on Mac, so we use MAP_ANON instead.
     void* const stack = mmap(nullptr, stack_size, PROT_READ | PROT_WRITE,
+    // Include the MAP_GROWSDOWN flag in linux for stack auto-resizing
+#    if GTEST_OS_LINUX
+                             (stack_grows_down ? MAP_GROWSDOWN : 0) |
+#    endif
                              MAP_ANON | MAP_PRIVATE, -1, 0);
     GTEST_DEATH_TEST_CHECK_(stack != MAP_FAILED);