linux-kernel - RE: [PATCH v1 1/2] open: add close

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Date:   Thu, 23 May 2019 16:29:44 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Konstantin Khlebnikov' <khlebnikov@...dex-team.ru>,
        Christian Brauner <christian@...uner.io>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "fweimer@...hat.com" <fweimer@...hat.com>
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        "oleg@...hat.com" <oleg@...hat.com>,
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Subject: RE: [PATCH v1 1/2] open: add close_range()

From:  Konstantin Khlebnikov
> Sent: 23 May 2019 17:22
....
>  > In addition, the syscall will also work for tasks that do not have procfs
>  > mounted and on kernels that do not have procfs support compiled in. In such
>  > situations the only way to make sure that all file descriptors are closed
>  > is to call close() on each file descriptor up to UINT_MAX or RLIMIT_NOFILE,
>  > OPEN_MAX trickery (cf. comment [8] on Rust).

Code using RLIMIT_NOFILE is broken.
It is easy to reduce the hard limit below that of an open fd.

	David

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