Revert of 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 17ef4b40de5a046286296eab9fafb8302e6ac2cb..4722af3369c2820f07d97ed560bec3a6ab6f8786 100644
--- a/sandbox/linux/services/yama_unittests.cc
+++ b/sandbox/linux/services/yama_unittests.cc
@@ -12,6 +12,8 @@
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/posix/eintr_wrapper.h"
+#include "base/strings/string_util.h"
+#include "base/sys_info.h"
 #include "sandbox/linux/services/scoped_process.h"
 #include "sandbox/linux/services/yama.h"
 #include "sandbox/linux/tests/unit_tests.h"
@@ -20,6 +22,21 @@
 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;