Commit 37e57e8a authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Show CPU vulnerabilites correctly 

Most LoongArch processors are vulnerable to Spectre-V1 Proof-of-Concept
(PoC). And the generic mechanism, __user pointer sanitization, can be
used as a mitigation. This means to use array_index_nospec() to prevent
out of boundry access in syscall and other critical paths.

Implement the arch-specific cpu_show_spectre_v1() to show CPU Spectre-V1
vulnerabilites correctly.

Cc: stable@vger.kernel.org
Link: https://cc-sw.com/chinese-loongarch-architecture-evaluation-part-3-of-3/


Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 02a6a1f9

arch/loongarch/kernel/cpu-probe.c

+7 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/ptrace.h>

#include <linux/cpu.h>

#include <linux/smp.h>

#include <linux/stddef.h>

#include <linux/export.h>
@@ -402,3 +403,9 @@ void cpu_probe(void) 


	cpu_report();

}



ssize_t cpu_show_spectre_v1(struct device *dev,

			    struct device_attribute *attr, char *buf)

{

	return sysfs_emit(buf, "Mitigation: __user pointer sanitization\n");

}