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arm64: ssbs: Don't treat CPUs with SSBS as unaffected by SSB

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[ Upstream commit eb337cdfcd ]

SSBS provides a relatively cheap mitigation for SSB, but it is still a
mitigation and its presence does not indicate that the CPU is unaffected
by the vulnerability.

Tweak the mitigation logic so that we report the correct string in sysfs.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Will Deacon
2019-10-08 17:39:29 +02:00
committed by Greg Kroah-Hartman
parent dada3a4abb
commit fe22ea561c
1 changed files with 7 additions and 5 deletions
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12
arch/arm64/kernel/cpu_errata.c
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@@ -341,15 +341,17 @@ static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
if (this_cpu_has_cap(ARM64_SSBS)) {
required = false;
goto out_printmsg;
}
/* delay setting __ssb_safe until we get a firmware response */
if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list))
this_cpu_safe = true;
if (this_cpu_has_cap(ARM64_SSBS)) {
if (!this_cpu_safe)
__ssb_safe = false;
required = false;
goto out_printmsg;
}
if (psci_ops.smccc_version == SMCCC_VERSION_1_0) {
ssbd_state = ARM64_SSBD_UNKNOWN;
if (!this_cpu_safe)