nospec-sysfs.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/device.h>
 3#include <linux/cpu.h>
 4#include <asm/facility.h>
 5#include <asm/nospec-branch.h>
 6
 7ssize_t cpu_show_spectre_v1(struct device *dev,
 8			    struct device_attribute *attr, char *buf)
 9{
10	return sysfs_emit(buf, "Mitigation: __user pointer sanitization\n");
11}
12
13ssize_t cpu_show_spectre_v2(struct device *dev,
14			    struct device_attribute *attr, char *buf)
15{
16	if (test_facility(156))
17		return sysfs_emit(buf, "Mitigation: etokens\n");
18	if (nospec_uses_trampoline())
19		return sysfs_emit(buf, "Mitigation: execute trampolines\n");
20	if (nobp_enabled())
21		return sysfs_emit(buf, "Mitigation: limited branch prediction\n");
22	return sysfs_emit(buf, "Vulnerable\n");
23}