Start all children in their own PID namespace.

sandbox/linux/services/namespace_sandbox_unittest.cc

Index: sandbox/linux/services/namespace_sandbox_unittest.cc
diff --git a/sandbox/linux/services/namespace_sandbox_unittest.cc b/sandbox/linux/services/namespace_sandbox_unittest.cc
index 8bb0bff83b7027d86d8b8e08ae82e0ea7ddd8c5a..efdeb8d81a339ca16c5fb9b33714380e66d43cdc 100644
--- a/sandbox/linux/services/namespace_sandbox_unittest.cc
+++ b/sandbox/linux/services/namespace_sandbox_unittest.cc
@@ -118,6 +118,77 @@ TEST_F(NamespaceSandboxTest, NestedNamespaceSandbox) {
   TestProc("NestedNamespaceSandbox");
 }
 
+const int kNormalExitCode = 0;
+const int kSignalTerminationExitCode = 255;
+
+// Ensure that CHECK(false) is distinguishable from _exit(kNormalExitCode).
+// Allowing noise since CHECK(false) will write a stack trace to stderr.
+SANDBOX_TEST_ALLOW_NOISE(ForkInNewPidNamespace, CheckDoesNotReturnZero) {
+  CHECK(sandbox::Credentials::MoveToNewUserNS());
+  const pid_t pid = NamespaceSandbox::ForkInNewPidNamespace(
+      /*drop_capabilities_in_child=*/true);
+  CHECK_GE(pid, 0);
+
+  if (pid == 0) {
+    CHECK(false);
+    _exit(kNormalExitCode);
+  }
+
+  int status;
+  PCHECK(waitpid(pid, &status, 0) == pid);
+  if (WIFEXITED(status)) {
+    CHECK_NE(kNormalExitCode, WEXITSTATUS(status));
+  }
+}
+
+SANDBOX_TEST(ForkInNewPidNamespace, BasicUsage) {
+  if (!Credentials::CanCreateProcessInNewUserNS()) {
+    return;
+  }
+
+  CHECK(sandbox::Credentials::MoveToNewUserNS());
+  const pid_t pid = NamespaceSandbox::ForkInNewPidNamespace(
+      /*drop_capabilities_in_child=*/true);
+  CHECK_GE(pid, 0);
+
+  if (pid == 0) {
+    CHECK_EQ(1, getpid());
+    CHECK(!Credentials::HasAnyCapability());
+    _exit(kNormalExitCode);
+  }
+
+  int status;
+  PCHECK(waitpid(pid, &status, 0) == pid);
+  CHECK(WIFEXITED(status));
+  CHECK_EQ(kNormalExitCode, WEXITSTATUS(status));
+}
+
+SANDBOX_TEST(ForkInNewPidNamespace, ExitWithSignal) {
+  if (!Credentials::CanCreateProcessInNewUserNS()) {
+    return;
+  }
+
+  CHECK(sandbox::Credentials::MoveToNewUserNS());
+  const pid_t pid = NamespaceSandbox::ForkInNewPidNamespace(
+      /*drop_capabilities_in_child=*/true);
+  CHECK_GE(pid, 0);
+
+  if (pid == 0) {
+    CHECK_EQ(1, getpid());
+    CHECK(!Credentials::HasAnyCapability());
+    NamespaceSandbox::InstallTerminationSignalHandler(
+        SIGTERM, kSignalTerminationExitCode);
+    while (true) {
+      raise(SIGTERM);
+    }
+  }
+
+  int status;
+  PCHECK(waitpid(pid, &status, 0) == pid);
+  CHECK(WIFEXITED(status));
+  CHECK_EQ(kSignalTerminationExitCode, WEXITSTATUS(status));
+}
+
 }  // namespace
 
 }  // namespace sandbox