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..b765f41b7b172e7cca9c469204d8f5613b5e7c8e 100644
--- a/sandbox/linux/services/yama_unittests.cc
+++ b/sandbox/linux/services/yama_unittests.cc
@@ -21,6 +21,21 @@ namespace sandbox {
 
 namespace {
 
+bool HasLinux32Bug() {
+#if defined(__i386__)
+  // On 3.2 kernels, yama doesn't work for 32bit binaries on 64bit kernels.

[Jorge Lucangeli Obes, 2014/07/08 04:57:14]

Yama, 32-bit, 64-bit

[Nico, 2014/07/08 05:00:47]

I had fixed the 32bit/64bit thing (see patch set 3). Fixed Yama now too.

+  // 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;
   ret = ptrace(PTRACE_ATTACH, pid, NULL, NULL);
@@ -112,6 +127,9 @@ void SetYamaRestrictions(bool enable_restriction) {
 }
 
 TEST(Yama, RestrictPtraceWorks) {
+  if (HasLinux32Bug())
+    return;
+
   ScopedProcess process1(base::Bind(&SetYamaRestrictions, true));
   ASSERT_TRUE(process1.WaitForClosureToRun());
 
@@ -134,7 +152,7 @@ TEST(Yama, RestrictPtraceWorks) {
 void DoNothing() {}
 
 SANDBOX_TEST(Yama, RestrictPtraceIsDefault) {
-  if (!Yama::IsPresent())
+  if (!Yama::IsPresent() || HasLinux32Bug())
     return;
 
   CHECK(Yama::DisableYamaRestrictions());