From: "A. Wilcox" <awilfox@adelielinux.org>
To: musl@lists.openwall.com
Subject: Re: bug#39236: [musl] coreutils cp mishandles error return from lchmod
Date: Wed, 12 Feb 2020 13:59:09 -0600 [thread overview]
Message-ID: <a68c59d8-af1e-8be8-3f66-074d2614ea56@adelielinux.org> (raw)
In-Reply-To: <20200212190742.GZ1663@brightrain.aerifal.cx>
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On 12/02/2020 13:07, Rich Felker wrote:
> On Wed, Feb 12, 2020 at 08:05:55AM -0500, Rich Felker wrote:
>> On Wed, Feb 12, 2020 at 12:50:19PM +0100, Florian Weimer wrote:
>>> * Paul Eggert:
>>>
>>>> On 1/22/20 2:05 PM, Rich Felker wrote:
>>>>> I think we're approaching a consensus that glibc should fix this too,
>>>>> so then it would just be gnulib matching the fix.
>>>>
>>>> I installed the attached patch to Gnulib in preparation for the upcoming
>>>> glibc fix. The patch causes fchmodat with AT_SYMLINK_NOFOLLOW to work on
>>>> non-symlinks, and similarly for lchmod on non-symlinks. The idea is to
>>>> avoid this sort of problem in the future, and to let Coreutils etc. work
>>>> on older platforms as if glibc 2.32 (or whatever) is already in place.
>>>
>>> The lchmod implementation based on /proc tickles an XFS bug:
>>>
>>> <https://sourceware.org/ml/libc-alpha/2020-02/msg00467.html>
>>
>> Uhg, why does Linux even let the fs driver see whether the chmod is
>> being performed via a filename, O_PATH fd, or magic symlink in /proc?
>> It should just be an operation on the inode.
>
> OK, I don't think it's actually clear from the test that the use of
> the magic symlink is the cause. It's plausible that XFS just always
> returns failure on success for this operation, and I don't have XFS to
> test with.
My root fs is XFS, but I only have musl to test with. Is there a test
case I can run on musl to determine the behaviour of XFS for you?
The only glibc distribution that supports my platform is Void, so I
don't know if the Void glibc spin in a chroot would be sufficient if
there is no way to do this from a musl system.
Best,
--arw
--
A. Wilcox (awilfox)
Project Lead, Adélie Linux
https://www.adelielinux.org
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next prev parent reply other threads:[~2020-02-12 19:59 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
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 [this message]
2020-02-12 20:56 ` Rich Felker
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