55 lines
1.6 KiB
Diff
55 lines
1.6 KiB
Diff
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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@@ -5001,26 +5001,43 @@
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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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+# 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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+# 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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+#ifndef PR_SPEC_STORE_BYPASS
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# define PR_SPEC_STORE_BYPASS 0
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+#endif
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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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+
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+#ifndef PR_SPEC_NOT_AFFECTED
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# define PR_SPEC_NOT_AFFECTED 0
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+#endif
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+#ifndef PR_SPEC_PRCTL
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# define PR_SPEC_PRCTL (1UL << 0)
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+#endif
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+#ifndef PR_SPEC_ENABLE
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# define PR_SPEC_ENABLE (1UL << 1)
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+#endif
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+#ifndef PR_SPEC_DISABLE
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# define PR_SPEC_DISABLE (1UL << 2)
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+#endif
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+#ifndef PR_SPEC_FORCE_DISABLE
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+# define PR_SPEC_FORCE_DISABLE (1UL << 3)
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+#endif
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+#ifndef PR_SPEC_DISABLE_NOEXEC
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+# define PR_SPEC_DISABLE_NOEXEC (1UL << 4)
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+#endif
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static void set_speculation() __attribute__((constructor));
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static void set_speculation() {
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+ if ( prctl(PR_SET_SPECULATION_CTRL,
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+ PR_SPEC_STORE_BYPASS,
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+ PR_SPEC_DISABLE_NOEXEC, 0, 0) == 0 ) {
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+ return;
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+ }
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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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