Mercurial > hg > release > icedtea7-forest-2.6 > hotspot
changeset 6665:efa98ed4bd43
PR3608: CVE-2018-3639 hw: cpu: speculative store bypass mitigation
author | andrew |
---|---|
date | Tue, 03 Jul 2018 04:06:06 +0100 |
parents | 6941480b5b05 |
children | e012acbfcd40 |
files | src/os/linux/vm/os_linux.cpp |
diffstat | 1 files changed, 27 insertions(+), 0 deletions(-) [+] |
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--- a/src/os/linux/vm/os_linux.cpp Mon Jul 02 15:58:25 2018 +0100 +++ b/src/os/linux/vm/os_linux.cpp Tue Jul 03 04:06:06 2018 +0100 @@ -124,6 +124,8 @@ # include <inttypes.h> # include <sys/ioctl.h> +#include <sys/prctl.h> + #ifndef _GNU_SOURCE #define _GNU_SOURCE #include <sched.h> @@ -4838,6 +4840,31 @@ } } +/* 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 */