linux-kernel - Re: [PATCH] utimensat() non-conformances and fixes

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Date:	Sun, 20 Apr 2008 23:20:43 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Michael Kerrisk <mtk.manpages@...glemail.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>, linux-man@...r.kernel.org
Subject: Re: [PATCH] utimensat() non-conformances and fixes

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Michael Kerrisk wrote:
> 1. The draft POSIX.1-200x specification for utimensat() says that if a
> times[n].tv_nsec field is UTIME_OMIT or UTIME_NOW, then the value in the
> corresponding tv_sec field is ignored.  However the current Linux
> implementation requires the tv_sec value to be zero (or the EINVAL error
> results).  This requirement should be removed.

OK, for now.  I think the implemented behavior is better, though.


> However, the current implementation does not generate
> EPERM if one tv_nsec field is UTIME_NOW while the other is UTIME_OMIT -- it
> should give this error for that case.

This is probably a necessary change.  Non-synchronized changes might be
a security problem.


> However, in
> the same circumstances, when utimensat() is given a 'times' array in which
> both tv_nsec fields are UTIME_NOW, which provides equivalent functionality
> to specifying 'times' as NULL, the call succeeds.  I think that it should fail
> with the error EACCES in this case.

I guess so.


> (times == NULL && times[0].tv_nsec == UTIME_NOW && times[1].tv_nsec ==
> UTIME_NOW)
> 
> case should be treated like the traditional utimes() case where 'times'
> is NULL.  That is, the call should succeed for a file marked append-only
> and should give the error EACCES if the file is marked as immutable.

Is this something I changed?  I doubt I added this.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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