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From: Florian Weimer <fweimer@redhat.com>
To: Rich Felker <dalias@libc.org>
Cc: 39236@debbugs.gnu.org,  musl@lists.openwall.com
Subject: Re: [musl] coreutils cp mishandles error return from lchmod
Date: Wed, 22 Jan 2020 22:05:52 +0100	[thread overview]
Message-ID: <87v9p3fbgv.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <20200122205605.GF30412@brightrain.aerifal.cx> (Rich Felker's message of "Wed, 22 Jan 2020 15:56:05 -0500")

* Rich Felker:

> On Wed, Jan 22, 2020 at 09:48:14PM +0100, Florian Weimer wrote:
>> * Rich Felker:
>> 
>> >> Hmm.  The way I read the musl code, the O_PATH descriptor already
>> >> exists.  At this point, you can just chmod the O_PATH descriptor, and
>> >> have the kernel report EOPNOTSUPP if the file system does not support
>> >> that.
>> >
>> > Oh, you mean the second one after it's already open? Maybe that's ok.
>> 
>> Yes, that's what I meant.
>> 
>> > I was concerned it might follow the link and chmod the target at that
>> > point.
>> 
>> In my tests, it works.  I think it's also documented behavior for chown
>> on these pseudo-files.
>
> Do you know where we might find that documentation?

Ugh.  I'm probably misremembering.  It may have been a rejection of
patch to implement another f*at system call with AT_EMPTY_PATH support.
(I did find your 2013 message describing the chmod and chown behavior.)

Thanks,
Florian


  reply	other threads:[~2020-01-22 21:06 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-22 14:15 Rich Felker
2020-01-22 14:34 ` Florian Weimer
2020-01-22 14:42   ` Rich Felker
2020-01-22 15:08     ` Florian Weimer
2020-01-22 15:15       ` Rich Felker
2020-01-22 15:32         ` Florian Weimer
2020-01-22 16:07           ` Rich Felker
2020-01-22 16:19             ` Florian Weimer
2020-01-22 17:15               ` Rich Felker
2020-01-22 20:48                 ` Florian Weimer
2020-01-22 20:56                   ` Rich Felker
2020-01-22 21:05                     ` Florian Weimer [this message]
2020-01-22 21:55       ` bug#39236: " Paul Eggert
2020-01-22 22:05         ` Rich Felker
2020-02-08  0:37           ` Paul Eggert
2020-02-12 11:50             ` Florian Weimer
2020-02-12 13:05               ` Rich Felker
2020-02-12 19:07                 ` Rich Felker
2020-02-12 19:13                   ` Florian Weimer
2020-02-12 19:59                   ` A. Wilcox
2020-02-12 20:56                     ` Rich Felker

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