linux-kernel - Re: [PATCH] clone3: add build-time CLONE_ARGS_SIZE

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Message-ID: <20200412212422.2a4endxiqfavf2cr@wittgenstein>
Date:   Sun, 12 Apr 2020 23:24:22 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Eugene Syromiatnikov <esyr@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Dmitry V. Levin" <ldv@...linux.org>
Subject: Re: [PATCH] clone3: add build-time CLONE_ARGS_SIZE_VER* validity
 checks

On Sun, Apr 12, 2020 at 10:26:58PM +0200, Eugene Syromiatnikov wrote:
> CLONE_ARGS_SIZE_VER* macros are defined explicitly and not via
> the offsets of the relevant struct clone_args fields, which makes
> it rather error-prone, so it probably makes sense to add some
> compile-time checks for them (including the one that breaks
> on struct clone_args extension as a reminder to add a relevant
> size macro and a similar check).  Function copy_clone_args_from_user
> seems to be a good place for such checks.
> 
> Signed-off-by: Eugene Syromiatnikov <esyr@...hat.com>

Yeah, that seems like a good idea to me.
Thanks, will queue for rc2 unless I hear objections.

Acked-by: Christian Brauner <christian.brauner@...ntu.com>