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authorMichael Cree <mcree@orcon.net.nz>2018-02-26 22:02:12 +1300
committerMatt Turner <mattst88@gmail.com>2018-04-07 15:04:04 -0700
commit6fd16ce5590e30d0ed8b21e977102361ff9f92ef (patch)
tree5f785735470f60b11bc8191c6431fea4c5d67e17 /arch/alpha
parent54f16b1967bd7c6a252b3c128032deb37cc61cf3 (diff)
downloadlinux-6fd16ce5590e30d0ed8b21e977102361ff9f92ef.tar.bz2
alpha: Implement CPU vulnerabilities sysfs functions.
Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and spectre_v2 on Alpha. Tests on XP1000 (EV67/667MHz) and ES45 (EV68CB/1.25GHz) show them to be vulnerable to Meltdown and Spectre V1. In the case of Meltdown I saw a 1 to 2% success rate in reading bytes on the XP1000 and 50 to 60% success rate on the ES45. (This compares to 99.97% success reported for Intel CPUs.) Report EV6 and later CPUs as vulnerable. Tests on PWS600au (EV56/600MHz) for Spectre V1 attack were unsuccessful (though I did not try particularly hard) so mark EV4 through to EV56 as not vulnerable. Signed-off-by: Michael Cree <mcree@orcon.net.nz> Signed-off-by: Matt Turner <mattst88@gmail.com>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/Kconfig1
-rw-r--r--arch/alpha/kernel/Makefile2
-rw-r--r--arch/alpha/kernel/bugs.c45
3 files changed, 47 insertions, 1 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index e96adcbcab41..b2022885ced8 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -18,6 +18,7 @@ config ALPHA
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select AUDIT_ARCH
select GENERIC_CLOCKEVENTS
+ select GENERIC_CPU_VULNERABILITIES
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
diff --git a/arch/alpha/kernel/Makefile b/arch/alpha/kernel/Makefile
index bf7b41fa7b01..5a74581bf0ee 100644
--- a/arch/alpha/kernel/Makefile
+++ b/arch/alpha/kernel/Makefile
@@ -9,7 +9,7 @@ ccflags-y := -Wno-sign-compare
obj-y := entry.o traps.o process.o osf_sys.o irq.o \
irq_alpha.o signal.o setup.o ptrace.o time.o \
- systbls.o err_common.o io.o
+ systbls.o err_common.o io.o bugs.o
obj-$(CONFIG_VGA_HOSE) += console.o
obj-$(CONFIG_SMP) += smp.o
diff --git a/arch/alpha/kernel/bugs.c b/arch/alpha/kernel/bugs.c
new file mode 100644
index 000000000000..08cc10d7fa17
--- /dev/null
+++ b/arch/alpha/kernel/bugs.c
@@ -0,0 +1,45 @@
+
+#include <asm/hwrpb.h>
+#include <linux/device.h>
+
+
+#ifdef CONFIG_SYSFS
+
+static int cpu_is_ev6_or_later(void)
+{
+ struct percpu_struct *cpu;
+ unsigned long cputype;
+
+ cpu = (struct percpu_struct *)((char *)hwrpb + hwrpb->processor_offset);
+ cputype = cpu->type & 0xffffffff;
+ /* Include all of EV6, EV67, EV68, EV7, EV79 and EV69. */
+ return (cputype == EV6_CPU) || ((cputype >= EV67_CPU) && (cputype <= EV69_CPU));
+}
+
+ssize_t cpu_show_meltdown(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (cpu_is_ev6_or_later())
+ return sprintf(buf, "Vulnerable\n");
+ else
+ return sprintf(buf, "Not affected\n");
+}
+
+ssize_t cpu_show_spectre_v1(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (cpu_is_ev6_or_later())
+ return sprintf(buf, "Vulnerable\n");
+ else
+ return sprintf(buf, "Not affected\n");
+}
+
+ssize_t cpu_show_spectre_v2(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (cpu_is_ev6_or_later())
+ return sprintf(buf, "Vulnerable\n");
+ else
+ return sprintf(buf, "Not affected\n");
+}
+#endif