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From: Stefan Wahren <stefan.wahren@i2se.com>
To: Jeremy Linton <jeremy.linton@arm.com>, marc.zyngier@arm.com
Cc: mlangsdo@redhat.com, julien.thierry@arm.com,
	catalin.marinas@arm.com, suzuki.poulose@arm.com,
	will.deacon@arm.com, linux-kernel@vger.kernel.org,
	steven.price@arm.com, shankerd@codeaurora.org, ykaukab@suse.de,
	dave.martin@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 0/7] arm64: add system vulnerability sysfs entries
Date: Sat, 19 Jan 2019 12:52:25 +0100 (CET)
Message-ID: <247598924.444809.1547898745403@email.ionos.de> (raw)
In-Reply-To: <3af70b49-22e7-f394-1b35-ce3c86640bb7@arm.com>


> Jeremy Linton <jeremy.linton@arm.com> hat am 18. Januar 2019 um 23:22 geschrieben:
> 
> 
> On 01/18/2019 12:05 PM, Stefan Wahren wrote:
> > Hi,
> > 
> > ...
> > 
> > a snippet or a new version would be nice
> 
> Sure, I've got another version, to be posted soon (probably Tue of next 
> week).
> 
> In the meantime, Marc's tree should work with the following fix:
> 
> diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
> index b44f87e7360d..7cfd34b2c0e5 100644
> --- a/arch/arm64/kernel/cpu_errata.c
> +++ b/arch/arm64/kernel/cpu_errata.c
> @@ -286,11 +286,15 @@ static int detect_harden_bp_fw(void)
>   }
>   #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
> 
> +#if defined(CONFIG_ARM64_SSBD) || \
> +       defined(CONFIG_GENERIC_CPU_VULNERABILITIES)
> +static bool __ssb_safe = true;
> +#endif
> +
>   #ifdef CONFIG_ARM64_SSBD
>   DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);
> 
>   int ssbd_state __read_mostly = ARM64_SSBD_KERNEL;
> -static bool __ssb_safe = true;
> 
>   static const struct ssbd_options {
>          const char      *str;
> @@ -569,6 +573,8 @@ check_branch_predictor(const struct 
> arm64_cpu_capabilities *entry, int scope)
> 
>          WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
> 
> +       arm64_requested_vuln_attrs |= VULN_SPECTREV2;
> +
>          /* If the CPU has CSV2 set, we're safe */
>          if 
> (cpuid_feature_extract_unsigned_field(read_cpuid(ID_AA64PFR0_EL1),
>                                                   ID_AA64PFR0_CSV2_SHIFT))
> @@ -578,17 +584,17 @@ check_branch_predictor(const struct 
> arm64_cpu_capabilities *entry, int scope)
>          if (is_midr_in_range_list(read_cpuid_id(), spectre_v2_safe_list))
>                  return false;
> 
> +       __spectrev2_safe = false;
> +
>          /* Fallback to firmware detection */
>          need_wa = detect_harden_bp_fw();
>          if (!need_wa)
>                  return false;
> 
> -       __spectrev2_safe = false;
> -
>          if (need_wa < 0)
>                  pr_warn_once("ARM_SMCCC_ARCH_WORKAROUND_1 missing from 
> firmware\n");
> 
> -       arm64_requested_vuln_attrs |= VULN_SPECTREV2;
> +
> 
>          return (need_wa > 0);
>   }
> 
>

fine with these changes i'm getting the following:

meltdown:Not affected
spec_store_bypass:Not affected
spectre_v1:Mitigation: __user pointer sanitization
spectre_v2:Not affected

Thanks
Stefan

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Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-09 23:55 Jeremy Linton
2019-01-09 23:55 ` [PATCH v3 1/7] sysfs/cpu: Allow individual architectures to select vulnerabilities Jeremy Linton
2019-01-14 10:02   ` Suzuki K Poulose
2019-01-18 15:46     ` Greg KH
2019-01-18 16:31       ` Jeremy Linton
2019-01-09 23:55 ` [PATCH v3 2/7] arm64: add sysfs vulnerability show for spectre v1 Jeremy Linton
2019-01-09 23:55 ` [PATCH v3 3/7] arm64: kpti: move check for non-vulnerable CPUs to a function Jeremy Linton
2019-01-12 10:41   ` Stefan Wahren
2019-01-14 11:32   ` Suzuki K Poulose
2019-01-18 16:35     ` Jeremy Linton
2019-01-09 23:55 ` [PATCH v3 4/7] arm64: add sysfs vulnerability show for meltdown Jeremy Linton
2019-01-10  9:23   ` Julien Thierry
2019-01-10 14:10     ` Jeremy Linton
2019-01-10 14:16       ` Julien Thierry
2019-01-09 23:55 ` [PATCH v3 5/7] arm64: add sysfs vulnerability show for spectre v2 Jeremy Linton
2019-01-09 23:55 ` [PATCH v3 6/7] arm64: add sysfs vulnerability show for speculative store bypass Jeremy Linton
2019-01-14 10:15   ` Marc Zyngier
2019-01-14 16:37     ` Jeremy Linton
2019-01-14 17:05       ` Marc Zyngier
2019-01-09 23:55 ` [PATCH v3 7/7] arm64: enable generic CPU vulnerabilites support Jeremy Linton
2019-01-15 19:50 ` [PATCH v3 0/7] arm64: add system vulnerability sysfs entries Stefan Wahren
2019-01-15 21:21   ` Jeremy Linton
2019-01-18 18:05     ` Stefan Wahren
2019-01-18 22:22       ` Jeremy Linton
2019-01-19 11:52         ` Stefan Wahren [this message]

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