linux-kernel - Re: [PATCH v12 11/12] open: openat2(2) syscall

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Date:   Sat, 7 Sep 2019 09:58:23 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Christian Brauner <christian@...uner.io>,
        Eric Biederman <ebiederm@...ssion.com>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Tycho Andersen <tycho@...ho.ws>,
        David Drysdale <drysdale@...gle.com>,
        Chanho Min <chanho.min@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
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        Aleksa Sarai <asarai@...e.de>,
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Subject: Re: [PATCH v12 11/12] open: openat2(2) syscall

On Sat, Sep 7, 2019 at 5:40 AM Jeff Layton <jlayton@...nel.org> wrote:
>
> After thinking about this a bit, I wonder if we might be better served
> with a new set of OA2_* flags instead of repurposing the O_* flags?

I'd hate to have yet _another_ set of translation functions, and
another chance of people just getting it wrong either in user space or
the kernel.

So no. Let's not make another set of flags that has no sane way to
have type-safety to avoid more confusion.

The new flags that _only_ work with openat2() might be named with a
prefix/suffix to mark that, but I'm not sure it's a huge deal.

                 Linus