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From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Aleksa Sarai <cyphar@cyphar.com>, Al Viro <viro@zeniv.linux.org.uk>
Cc: mtk.manpages@gmail.com, Christian Brauner <christian@brauner.io>,
	Aleksa Sarai <asarai@suse.de>,
	linux-man@vger.kernel.org, linux-api@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH man-pages v2 2/2] openat2.2: document new openat2(2) syscall
Date: Mon, 30 Mar 2020 11:08:12 +0200	[thread overview]
Message-ID: <4dcea613-60b8-a8af-9688-be93858ab652@gmail.com> (raw)
In-Reply-To: <20200202151907.23587-3-cyphar@cyphar.com>

Hello Aleksa,

On 2/2/20 4:19 PM, Aleksa Sarai wrote:
> Rather than trying to merge the new syscall documentation into open.2
> (which would probably result in the man-page being incomprehensible),
> instead the new syscall gets its own dedicated page with links between
> open(2) and openat2(2) to avoid duplicating information such as the list
> of O_* flags or common errors.
> 
> In addition to describing all of the key flags, information about the
> extensibility design is provided so that users can better understand why
> they need to pass sizeof(struct open_how) and how their programs will
> work across kernels. After some discussions with David Laight, I also
> included explicit instructions to zero the structure to avoid issues
> when recompiling with new headers.>
> Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

I'm just editing this page, and have a question on one piece.

> +Unlike
> +.BR openat (2),
> +it is an error to provide
> +.BR openat2 ()
> +with a
> +.I mode
> +which contains bits other than
> +.IR 0777 ,

This piece appears not to be true, both from my reading of the
source code, and from testing (i.e., I wrote a a small program that
successfully called openat2() and created a file that had the
set-UID, set-GID, and sticky bits set).

Is this a bug in the implementation or a bug in the manual page text?

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

  reply	other threads:[~2020-03-30  9:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-02 15:19 [PATCH man-pages v2 0/2] document openat2(2) Aleksa Sarai
2020-02-02 15:19 ` [PATCH man-pages v2 1/2] path_resolution.7: update to mention openat2(2) features Aleksa Sarai
2020-03-30 20:38   ` Michael Kerrisk (man-pages)
2020-02-02 15:19 ` [PATCH man-pages v2 2/2] openat2.2: document new openat2(2) syscall Aleksa Sarai
2020-03-30  9:08   ` Michael Kerrisk (man-pages) [this message]
2020-03-30  9:20     ` Aleksa Sarai
2020-03-30  9:36       ` Michael Kerrisk (man-pages)
2020-03-30  9:48         ` Aleksa Sarai
2020-03-30 20:43   ` Michael Kerrisk (man-pages)
2020-03-31 14:39     ` Aleksa Sarai
2020-04-01  6:38       ` Michael Kerrisk (man-pages)
2020-04-08 21:29         ` Michael Kerrisk (man-pages)
2020-04-12 16:49         ` Aleksa Sarai
2020-04-13  7:22           ` Michael Kerrisk (man-pages)
2020-04-14 10:35             ` Aleksa Sarai
2020-04-15 20:24               ` Michael Kerrisk (man-pages)
2020-05-04 10:17               ` Michael Kerrisk (man-pages)
2020-06-10  5:53               ` [PATCH] symlink.7: document magic-links more completely Aleksa Sarai
2020-06-19 13:00                 ` Michael Kerrisk (man-pages)

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