linux-kernel - Re: [PATCH 0/5] Introduce support for PSF mitigation

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Message-ID: <20210409090746.GB15567@zn.tnic>
Date:   Fri, 9 Apr 2021 11:07:46 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Saripalli, RK" <rsaripal@....com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH 0/5] Introduce support for PSF mitigation

On Thu, Apr 08, 2021 at 09:56:47AM -0500, Saripalli, RK wrote:
> It is possible most applications have been reviewed and scrubbed for
> SSB-type attacks but PSF-type issues may not have been looked at yet.
> This may be one of the cases where SSB is enabled but PSF is disabled
> until the application(s) are scrubbed for the same.

Right, and for that I think we could do a slimmer version of the psfd=
toggle - no prctl and seccomp stuff - just the cmdline disable thing to
keep this simpler.

Btw "psfd=" is maybe too short and cryptic. It would probably be more
user-friendly if it were called:

predict_store_fwd={on,off,...}

or so.

Thx.

-- 
Regards/Gruss,
    Boris.

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