Blame SOURCES/rh1566890-CVE_2018_3639-speculative_store_bypass.patch

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diff --git openjdk.orig/hotspot/src/os/linux/vm/os_linux.cpp openjdk/hotspot/src/os/linux/vm/os_linux.cpp
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--- openjdk.orig/hotspot/src/os/linux/vm/os_linux.cpp
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+++ openjdk/hotspot/src/os/linux/vm/os_linux.cpp
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@@ -103,6 +103,8 @@
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 # include <inttypes.h>
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 # include <sys/ioctl.h>
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+#include <sys/prctl.h>
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+
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 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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 #ifndef _GNU_SOURCE
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@@ -4997,6 +4999,31 @@
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   }
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 }
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+/* Per task speculation control */
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+#ifndef PR_GET_SPECULATION_CTRL
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+#define PR_GET_SPECULATION_CTRL    52
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+#endif
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+#ifndef PR_SET_SPECULATION_CTRL
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+#define PR_SET_SPECULATION_CTRL    53
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+#endif
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+/* Speculation control variants */
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+# undef PR_SPEC_STORE_BYPASS
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+# define PR_SPEC_STORE_BYPASS          0
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+/* Return and control values for PR_SET/GET_SPECULATION_CTRL */
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+# undef PR_SPEC_NOT_AFFECTED
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+# undef PR_SPEC_PRCTL
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+# undef PR_SPEC_ENABLE
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+# undef PR_SPEC_DISABLE
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+# define PR_SPEC_NOT_AFFECTED          0
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+# define PR_SPEC_PRCTL                 (1UL << 0)
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+# define PR_SPEC_ENABLE                (1UL << 1)
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+# define PR_SPEC_DISABLE               (1UL << 2)
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+
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+static void set_speculation() __attribute__((constructor));
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+static void set_speculation() {
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+  prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_STORE_BYPASS, PR_SPEC_DISABLE, 0, 0);
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+}
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+
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 // this is called _before_ most of the global arguments have been parsed
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 void os::init(void) {
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   char dummy;   /* used to get a guess on initial stack address */