RE: [PATCH v2] Implement close-on-fork

[Karstens, Nate]

Matthew,

What alternative would you suggest?

>From an earlier email:

> ...nothing else addresses the underlying issue: there is no way to
> prevent a fork() from duplicating the resource. The close-on-exec
> flag partially-addresses this by allowing the parent process to
> mark a file descriptor as exclusive to itself, but there is still
> a period of time the failure can occur because the auto-close only
> occurs during the exec(). Perhaps this would not be an issue with
> a different process/threading model, but that is another discussion
> entirely.

Do you disagree there is an issue?

-----Original Message-----
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Sent: Friday, May 15, 2020 10:58
To: Karstens, Nate <Nate.Karstens@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>; Jeff Layton <jlayton@xxxxxxxxxx>; J. Bruce Fields <bfields@xxxxxxxxxxxx>; Arnd Bergmann <arnd@xxxxxxxx>; Richard Henderson <rth@xxxxxxxxxxx>; Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>; Matt Turner <mattst88@xxxxxxxxx>; James E.J. Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>; Helge Deller <deller@xxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; Eric Dumazet <edumazet@xxxxxxxxxx>; David Laight <David.Laight@xxxxxxxxxx>; linux-fsdevel@xxxxxxxxxxxxxxx; linux-arch@xxxxxxxxxxxxxxx; linux-alpha@xxxxxxxxxxxxxxx; linux-parisc@xxxxxxxxxxxxxxx; sparclinux@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Changli Gao <xiaosuo@xxxxxxxxx>; a.josey@xxxxxxxxxxxxx
Subject: Re: [PATCH v2] Implement close-on-fork

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On Fri, May 15, 2020 at 10:23:17AM -0500, Nate Karstens wrote:
> Series of 4 patches to implement close-on-fork. Tests have been
> published to https://github.com/nkarstens/ltp/tree/close-on-fork
> and cover close-on-fork functionality in the following syscalls:

[...]

> This functionality was approved by the Austin Common Standards
> Revision Group for inclusion in the next revision of the POSIX
> standard (see issue 1318 in the Austin Group Defect Tracker).

NAK to this patch series, and the entire concept.

Is there a way to persuade POSIX that they made a bad decision by standardising this mess?

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