Revert of Disable yama on 3.2 kernels with 32bit userland and 64bit kernel.

sandbox/linux/services/yama_unittests.cc

Index: sandbox/linux/services/yama_unittests.cc
diff --git a/sandbox/linux/services/yama_unittests.cc b/sandbox/linux/services/yama_unittests.cc
index eb783d97c333aa92506b7627ec7b490dccddba64..17ef4b40de5a046286296eab9fafb8302e6ac2cb 100644
--- a/sandbox/linux/services/yama_unittests.cc
+++ b/sandbox/linux/services/yama_unittests.cc
@@ -20,21 +20,6 @@
 namespace sandbox {
 
 namespace {
-
-bool HasLinux32Bug() {
-#if defined(__i386__)
-  // On 3.2 kernels, yama doesn't work for 32-bit binaries on 64-bit kernels.
-  // This is fixed in 3.4.
-  bool is_kernel_64bit =
-      base::SysInfo::OperatingSystemArchitecture() == "x86_64";
-  bool is_linux = base::SysInfo::OperatingSystemName() == "Linux";
-  bool is_3_dot_2 = StartsWithASCII(
-      base::SysInfo::OperatingSystemVersion(), "3.2", /*case_sensitive=*/false);
-  if (is_kernel_64bit && is_linux && is_3_dot_2)
-    return true;
-#endif  // defined(__i386__)
-  return false;
-}
 
 bool CanPtrace(pid_t pid) {
   int ret;
@@ -127,9 +112,6 @@
 }
 
 TEST(Yama, RestrictPtraceWorks) {
-  if (HasLinux32Bug())
-    return;
-
   ScopedProcess process1(base::Bind(&SetYamaRestrictions, true));
   ASSERT_TRUE(process1.WaitForClosureToRun());
 
@@ -152,7 +134,7 @@
 void DoNothing() {}
 
 SANDBOX_TEST(Yama, RestrictPtraceIsDefault) {
-  if (!Yama::IsPresent() || HasLinux32Bug())
+  if (!Yama::IsPresent())
     return;
 
   CHECK(Yama::DisableYamaRestrictions());