linux-kernel - Re: [PATCH v15 7/9] open: introduce openat2(2) syscall

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Date:   Wed, 13 Nov 2019 02:29:06 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Aleksa Sarai <cyphar@...har.com>
Cc:     Jeff Layton <jlayton@...nel.org>,
        "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>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Aleksa Sarai <asarai@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        containers@...ts.linux-foundation.org, linux-alpha@...r.kernel.org,
        linux-api@...r.kernel.org, libc-alpha@...rceware.org,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v15 7/9] open: introduce openat2(2) syscall

On Tue, Nov 05, 2019 at 08:05:51PM +1100, Aleksa Sarai wrote:
  
> +/*
> + * Arguments for how openat2(2) should open the target path. If @resolve is
> + * zero, then openat2(2) operates very similarly to openat(2).
> + *
> + * However, unlike openat(2), unknown bits in @flags result in -EINVAL rather
> + * than being silently ignored. @mode must be zero unless one of {O_CREAT,
> + * O_TMPFILE} are set, and @upgrade_mask must be zero unless O_PATH is set.
> + *
> + * @flags: O_* flags.
> + * @mode: O_CREAT/O_TMPFILE file mode.
> + * @upgrade_mask: UPGRADE_* flags (to restrict O_PATH re-opening).

???

> + * @resolve: RESOLVE_* flags.
> + */
> +struct open_how {
> +	__aligned_u64 flags;
> +	__u16 mode;
> +	__u16 __padding[3]; /* must be zeroed */
> +	__aligned_u64 resolve;
> +};