linux-kernel - Re: [PATCH RFT v4 0/5] fork: Support shadow stacks in clone3()

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Date:   Sat, 9 Dec 2023 01:06:56 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Robert O'Callahan <robert@...llahan.org>
Cc:     "Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
        Deepak Gupta <debug@...osinc.com>,
        Szabolcs Nagy <Szabolcs.Nagy@....com>,
        "H.J. Lu" <hjl.tools@...il.com>,
        Florian Weimer <fweimer@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Christian Brauner <brauner@...nel.org>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Kees Cook <keescook@...omium.org>, jannh@...gle.com,
        linux-kselftest@...r.kernel.org, linux-api@...r.kernel.org,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH RFT v4 0/5] fork: Support shadow stacks in clone3()

On Sat, Dec 09, 2023 at 01:59:16PM +1300, Robert O'Callahan wrote:

> overriding clone_args::shadow_stack_size to zero in the call to
> clone3(), instead having the replay task call map_shadow_stack() to
> put the the shadow stack in the right place, and then setting its SSP
> via ptrace. Will that work?

That should work with the interface in the current series, yes.

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