linux-kernel - Re: RETBleed: WARNING: Spectre v2 mitigation leaves CPU vulnerable to RETBleed attacks, data leaks possible!

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Date:   Thu, 14 Jul 2022 11:01:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     open list <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        lkft-triage@...ts.linaro.org, Borislav Petkov <bp@...e.de>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>
Subject: Re: RETBleed: WARNING: Spectre v2 mitigation leaves CPU vulnerable
 to RETBleed attacks, data leaks possible!

On Thu, Jul 14, 2022 at 02:15:07PM +0530, Naresh Kamboju wrote:
> Results from Linaro’s test farm.
> 
> We are booting the i386 kernel on an x86 machine.
> With Spectre V2 patches merged into Linux mainline we have been noticing
> RETBleed: WARNING: Spectre v2 mitigation leaves CPU vulnerable to
> RETBleed attacks, data leaks possible!

That's funny.  I don't think that's a valid combination that should be
cared about, but I'll leave it to Pawan to comment if it is something
that is "real" to be concerned for.

thanks,

greg k-h