linux-kernel - RE: [PATCH 1/4] fs: Implement close-on-fork

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Date:   Wed, 22 Apr 2020 16:55:58 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Bernd Petrovitsch' <bernd@...rovitsch.priv.at>,
        "Karstens, Nate" <Nate.Karstens@...min.com>,
        Matthew Wilcox <willy@...radead.org>
CC:     Alexander Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Arnd Bergmann <arnd@...db.de>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Changli Gao <xiaosuo@...il.com>
Subject: RE: [PATCH 1/4] fs: Implement close-on-fork

From: Bernd Petrovitsch
> Sent: 22 April 2020 17:32
...
> Apart from that, system() is a PITA even on
> single/non-threaded apps.

Not only that, it is bloody dangerous because (typically)
shell is doing post substitution syntax analysis.

If you need to run an external process you need to generate
an arv[] array containing the parameters.

	David

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