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Commit 61dc0f55 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86/cpu: Implement CPU vulnerabilites sysfs functions 



Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and
spectre_v2.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lkml.kernel.org/r/20180107214913.177414879@linutronix.de
parent 87590ce6

arch/x86/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -89,6 +89,7 @@ config X86 
	select GENERIC_CLOCKEVENTS_MIN_ADJUST

	select GENERIC_CLOCKEVENTS_MIN_ADJUST

	select GENERIC_CMOS_UPDATE

	select GENERIC_CMOS_UPDATE

	select GENERIC_CPU_AUTOPROBE

	select GENERIC_CPU_AUTOPROBE

	select GENERIC_CPU_VULNERABILITIES

	select GENERIC_EARLY_IOREMAP

	select GENERIC_EARLY_IOREMAP

	select GENERIC_FIND_FIRST_BIT

	select GENERIC_FIND_FIRST_BIT

	select GENERIC_IOMAP

	select GENERIC_IOMAP

arch/x86/kernel/cpu/bugs.c

+29 −0
Original line number Original line Diff line number Diff line
@@ -10,6 +10,7 @@ 
 */

 */

#include <linux/init.h>

#include <linux/init.h>

#include <linux/utsname.h>

#include <linux/utsname.h>

#include <linux/cpu.h>

#include <asm/bugs.h>

#include <asm/bugs.h>

#include <asm/processor.h>

#include <asm/processor.h>

#include <asm/processor-flags.h>

#include <asm/processor-flags.h>
@@ -60,3 +61,31 @@ void __init check_bugs(void) 
		set_memory_4k((unsigned long)__va(0), 1);

		set_memory_4k((unsigned long)__va(0), 1);

#endif

#endif

}

}



#ifdef CONFIG_SYSFS

ssize_t cpu_show_meltdown(struct device *dev,

			  struct device_attribute *attr, char *buf)

{

	if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))

		return sprintf(buf, "Not affected\n");

	if (boot_cpu_has(X86_FEATURE_PTI))

		return sprintf(buf, "Mitigation: PTI\n");

	return sprintf(buf, "Vulnerable\n");

}



ssize_t cpu_show_spectre_v1(struct device *dev,

			    struct device_attribute *attr, char *buf)

{

	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))

		return sprintf(buf, "Not affected\n");

	return sprintf(buf, "Vulnerable\n");

}



ssize_t cpu_show_spectre_v2(struct device *dev,

			    struct device_attribute *attr, char *buf)

{

	if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2))

		return sprintf(buf, "Not affected\n");

	return sprintf(buf, "Vulnerable\n");

}

#endif