| Message ID | 20180827143310.641-6-ykaukab@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: add support for generic cpu vulnerabilities | expand |
On Mon, Aug 27, 2018 at 04:33:09PM +0200, Mian Yousaf Kaukab wrote: > Return status based no ssbd_state. Return string "Unknown" in case > CONFIG_ARM64_SSBD is disabled or arch workaround2 is not available > in the firmware. > > Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de> > --- > arch/arm64/kernel/cpu_errata.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c > index 8469d3be7b15..8b60aa30a3fa 100644 > --- a/arch/arm64/kernel/cpu_errata.c > +++ b/arch/arm64/kernel/cpu_errata.c > @@ -744,4 +744,24 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, > return sprintf(buf, "Not affected\n"); > } > > +ssize_t cpu_show_spec_store_bypass(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + switch (arm64_get_ssbd_state()) { > + case ARM64_SSBD_MITIGATED: > + return sprintf(buf, "Not affected\n"); > + > + case ARM64_SSBD_KERNEL: > + case ARM64_SSBD_FORCE_ENABLE: > + return sprintf(buf, > + "Mitigation: Speculative Store Bypass disabled"); > + > + case ARM64_SSBD_FORCE_DISABLE: > + return sprintf(buf, "Vulnerable\n"); > + > + default: /* ARM64_SSBD_UNKNOWN*/ > + return sprintf(buf, "Unknown\n"); > + } > +} This probably wants extending for CPUs that support SSBS (see for-next/core). Will
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 8469d3be7b15..8b60aa30a3fa 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -744,4 +744,24 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, return sprintf(buf, "Not affected\n"); } +ssize_t cpu_show_spec_store_bypass(struct device *dev, + struct device_attribute *attr, char *buf) +{ + switch (arm64_get_ssbd_state()) { + case ARM64_SSBD_MITIGATED: + return sprintf(buf, "Not affected\n"); + + case ARM64_SSBD_KERNEL: + case ARM64_SSBD_FORCE_ENABLE: + return sprintf(buf, + "Mitigation: Speculative Store Bypass disabled"); + + case ARM64_SSBD_FORCE_DISABLE: + return sprintf(buf, "Vulnerable\n"); + + default: /* ARM64_SSBD_UNKNOWN*/ + return sprintf(buf, "Unknown\n"); + } +} + #endif
Return status based no ssbd_state. Return string "Unknown" in case CONFIG_ARM64_SSBD is disabled or arch workaround2 is not available in the firmware. Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de> --- arch/arm64/kernel/cpu_errata.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)