arch/s390/kernel/nospec-sysfs.c

Source file repositories/reference/linux-study-clean/arch/s390/kernel/nospec-sysfs.c

File Facts

System
Linux kernel
Corpus path
arch/s390/kernel/nospec-sysfs.c
Extension
.c
Size
717 bytes
Lines
24
Domain
Architecture Layer
Bucket
arch/s390
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/device.h>
#include <linux/cpu.h>
#include <asm/facility.h>
#include <asm/nospec-branch.h>

ssize_t cpu_show_spectre_v1(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	return sysfs_emit(buf, "Mitigation: __user pointer sanitization\n");
}

ssize_t cpu_show_spectre_v2(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	if (test_facility(156))
		return sysfs_emit(buf, "Mitigation: etokens\n");
	if (nospec_uses_trampoline())
		return sysfs_emit(buf, "Mitigation: execute trampolines\n");
	if (nobp_enabled())
		return sysfs_emit(buf, "Mitigation: limited branch prediction\n");
	return sysfs_emit(buf, "Vulnerable\n");
}

Annotation

Implementation Notes