# ssbd2.patch

--- ./openjdk/hotspot/src/os/linux/vm/os_linux.cpp~	2018-05-02 13:02:51.924489199 -0400

+++ ./openjdk/hotspot/src/os/linux/vm/os_linux.cpp	2018-05-02 13:04:57.274216581 -0400

@@ -102,6 +102,8 @@

 # include <inttypes.h>

 # include <sys/ioctl.h>

+#include <sys/prctl.h>

+

 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

 #ifndef _GNU_SOURCE

@@ -4892,6 +4894,31 @@

   }

 }

+/* Per task speculation control */

+#ifndef PR_GET_SPECULATION_CTRL

+#define PR_GET_SPECULATION_CTRL    52

+#endif

+#ifndef PR_SET_SPECULATION_CTRL

+#define PR_SET_SPECULATION_CTRL    53

+#endif

+/* Speculation control variants */

+# undef PR_SPEC_STORE_BYPASS

+# define PR_SPEC_STORE_BYPASS          0

+/* Return and control values for PR_SET/GET_SPECULATION_CTRL */

+# undef PR_SPEC_NOT_AFFECTED

+# undef PR_SPEC_PRCTL

+# undef PR_SPEC_ENABLE

+# undef PR_SPEC_DISABLE

+# define PR_SPEC_NOT_AFFECTED          0

+# define PR_SPEC_PRCTL                 (1UL << 0)

+# define PR_SPEC_ENABLE                (1UL << 1)

+# define PR_SPEC_DISABLE               (1UL << 2)

+

+static void set_speculation() __attribute__((constructor));

+static void set_speculation() {

+  prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);

+}

+

 // this is called _before_ the most of global arguments have been parsed

 void os::init(void) {

   char dummy;   /* used to get a guess on initial stack address */