From: "Darrick J. Wong" <djwong@kernel.org>
To: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
Cc: linux-xfs@vger.kernel.org, christian.brauner@ubuntu.com, hch@lst.de
Subject: Re: [PATCH] xfs: do not clear S_ISUID|S_ISGID for idmapped mounts
Date: Thu, 24 Feb 2022 17:57:38 -0800 [thread overview]
Message-ID: <20220225015738.GP8313@magnolia> (raw)
In-Reply-To: <20220221182218.748084-1-andrey.zhadchenko@virtuozzo.com>
On Mon, Feb 21, 2022 at 09:22:18PM +0300, Andrey Zhadchenko wrote:
> xfs_fileattr_set() handles idmapped mounts correctly and do not drop this
> bits.
> Unfortunately chown syscall results in different callstask:
> i_op->xfs_vn_setattr()->...->xfs_setattr_nonsize() which checks if process
> has CAP_FSETID capable in init_user_ns rather than mntns userns.
>
> Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko@virtuozzo.com>
LGTM...
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
--D
> ---
> fs/xfs/xfs_iops.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index 09211e1d08ad..5b1fe635d153 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -774,7 +774,7 @@ xfs_setattr_nonsize(
> * cleared upon successful return from chown()
> */
> if ((inode->i_mode & (S_ISUID|S_ISGID)) &&
> - !capable(CAP_FSETID))
> + !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
> inode->i_mode &= ~(S_ISUID|S_ISGID);
>
> /*
> --
> 2.35.0.rc2
>
next prev parent reply other threads:[~2022-02-25 1:57 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-21 18:22 [PATCH] xfs: do not clear S_ISUID|S_ISGID for idmapped mounts Andrey Zhadchenko
2022-02-22 8:33 ` Christoph Hellwig
2022-02-22 9:25 ` Andrey Zhadchenko
2022-02-22 10:24 ` Christian Brauner
2022-02-22 11:19 ` Andrey Zhadchenko
2022-02-22 12:23 ` Christian Brauner
2022-02-22 12:36 ` Christian Brauner
2022-02-22 12:44 ` Christian Brauner
2022-02-22 14:54 ` Andrey Zhadchenko
2022-02-22 15:03 ` Christian Brauner
2022-02-22 21:40 ` Dave Chinner
2022-02-23 8:11 ` Christian Brauner
2022-02-25 1:57 ` Darrick J. Wong [this message]
2022-02-25 9:45 ` Christian Brauner
2022-02-25 10:42 ` Andrey Zhadchenko
2022-02-25 17:11 ` Darrick J. Wong
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