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Date:   Thu, 25 Apr 2019 19:11:11 +0200 (CEST)
From:   Stefan Wahren <>
To:     Jeremy Linton <>,
Subject: Re: [v8 09/10] arm64: add sysfs vulnerability show for speculative
 store bypass

> Jeremy Linton <> hat am 15. April 2019 um 23:21 geschrieben:
> Return status based on ssbd_state and __ssb_safe. If the
> mitigation is disabled, or the firmware isn't responding then
> return the expected machine state based on a whitelist of known
> good cores.
> Given a heterogeneous machine, the overall machine vulnerability
> defaults to safe but is reset to unsafe when we miss the whitelist
> and the firmware doesn't explicitly tell us the core is safe.
> In order to make that work we delay transitioning to vulnerable
> until we know the firmware isn't responding to avoid a case
> where we miss the whitelist, but the firmware goes ahead and
> reports the core is not vulnerable. If all the cores in the
> machine have SSBS, then __ssb_safe will remain true.
> Signed-off-by: Jeremy Linton <>

Tested-by: Stefan Wahren <>

on a Raspberry Pi 3 B

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