linux-kernel - Re: [PATCH] fanotify: add a flag to allow setting O

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Message-ID: <542D1726.3040801@draigBrady.com>
Date:	Thu, 02 Oct 2014 10:13:10 +0100
From:	Pádraig Brady <P@...igBrady.com>
To:	Yann Droneaud <ydroneaud@...eya.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Heinrich Schuchardt <xypron.glpk@....de>,
	Eric Paris <eparis@...hat.com>,
	Richard Guy Briggs <rgb@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	stable@...r.kernel.org, linux-api@...r.kernel.org,
	Jan Kara <jack@...e.cz>,
	Lino Sanfilippo <LinoSanfilippo@....de>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Michael Kerrisk-manpages <mtk.manpages@...il.com>
Subject: Re: [PATCH] fanotify: add a flag to allow setting O_CLOEXEC on event
 fd

On 10/02/2014 08:52 AM, Yann Droneaud wrote:
> In order to not potentially break applications which were
> requesting O_CLOEXEC on event file descriptors but which
> actually need it to be not effective as the kernel currently
> ignore the flag, so the file descriptor is inherited accross
> exec regardless of O_CLOEXEC (please forgive me for the
> wording), this patch introduces FAN_FD_CLOEXEC flag to
> fanotify_init() so that application can request O_CLOEXEC
> to be effective.
> Newer application would use FAN_FD_CLOEXEC flag along
> O_CLOEXEC to enable close on exec on newly created
> file descriptor:
> 
>   fd = fanotify_init(FAN_CLOEXEC|FAN_NONBLOCK|FAN_FD_CLOEXEC,
>                      O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME);

Ugh really?
IMHO there should be widespread or at least known breakage with
O_CLOEXEC before adding messiness like this.
It seems surprising to me that apps that would depend on
O_CLOEXEC being ineffective.

please reconsider this one.

thanks,
Pádraig.

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