linux-kernel - Re: [PATCH v7 3/7] kernel: Implement selective syscall userspace redirection

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Date:   Fri, 20 Nov 2020 16:18:55 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     luto@...nel.org, Rich Felker <dalias@...c.org>, tglx@...utronix.de,
        christian.brauner@...ntu.com, peterz@...radead.org,
        willy@...radead.org, shuah@...nel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kselftest@...r.kernel.org, x86@...nel.org, gofmanp@...il.com,
        kernel@...labora.com
Subject: Re: [PATCH v7 3/7] kernel: Implement selective syscall userspace
 redirection

On Thu, Nov 19, 2020 at 12:43:05PM -0500, Gabriel Krisman Bertazi wrote:
> The existing interface could be extended with a flags field as part of
> the opcode passed in argument 2, which is currently reserved, and then
> return a FD, just like seccomp(2) does.  So it is not like the current
> patches couldn't be extended in the future if needed, unless I'm
> mistaken.

Yes, I'd prefer this series go in as-is, and if there is a need for
extending the API, arg2 can have more values added.

-- 
Kees Cook