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6fd16ce559
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>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
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#include <asm/hwrpb.h>
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#include <linux/device.h>
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#ifdef CONFIG_SYSFS
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static int cpu_is_ev6_or_later(void)
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{
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struct percpu_struct *cpu;
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unsigned long cputype;
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cpu = (struct percpu_struct *)((char *)hwrpb + hwrpb->processor_offset);
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cputype = cpu->type & 0xffffffff;
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/* Include all of EV6, EV67, EV68, EV7, EV79 and EV69. */
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return (cputype == EV6_CPU) || ((cputype >= EV67_CPU) && (cputype <= EV69_CPU));
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}
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ssize_t cpu_show_meltdown(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (cpu_is_ev6_or_later())
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return sprintf(buf, "Vulnerable\n");
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else
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return sprintf(buf, "Not affected\n");
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}
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ssize_t cpu_show_spectre_v1(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (cpu_is_ev6_or_later())
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return sprintf(buf, "Vulnerable\n");
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else
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return sprintf(buf, "Not affected\n");
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}
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ssize_t cpu_show_spectre_v2(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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if (cpu_is_ev6_or_later())
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return sprintf(buf, "Vulnerable\n");
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else
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return sprintf(buf, "Not affected\n");
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}
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#endif
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