From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
"Rafael J. Wysocki" <rafael@kernel.org>,
Pavel Machek <pavel@ucw.cz>, Jakub Kicinski <kuba@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Stephen Hemminger <stephen@networkplumber.org>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH net-next 01/10] sysfs: add sysfs_file_change_owner()
Date: Wed, 12 Feb 2020 05:19:14 -0800 [thread overview]
Message-ID: <20200212131914.GB1789899@kroah.com> (raw)
In-Reply-To: <20200212104321.43570-2-christian.brauner@ubuntu.com>
On Wed, Feb 12, 2020 at 11:43:12AM +0100, Christian Brauner wrote:
> Add a helper to change the owner of a sysfs file.
> The ownership of a sysfs object is determined based on the ownership of
> the corresponding kobject, i.e. only if the ownership of a kobject is
> changed will this function change the ownership of the corresponding
> sysfs entry.
> This function will be used to correctly account for kobject ownership
> changes, e.g. when moving network devices between network namespaces.
>
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
> ---
> fs/sysfs/file.c | 46 +++++++++++++++++++++++++++++++++++++++++++
> include/linux/sysfs.h | 7 +++++++
> 2 files changed, 53 insertions(+)
>
> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> index 130fc6fbcc03..007b97ca8165 100644
> --- a/fs/sysfs/file.c
> +++ b/fs/sysfs/file.c
> @@ -558,3 +558,49 @@ void sysfs_remove_bin_file(struct kobject *kobj,
> kernfs_remove_by_name(kobj->sd, attr->attr.name);
> }
> EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);
> +
> +static int internal_change_owner(struct kernfs_node *kn, struct kobject *kobj)
> +{
> + kuid_t uid;
> + kgid_t gid;
> + struct iattr newattrs = {
> + .ia_valid = ATTR_UID | ATTR_GID,
> + };
> +
> + kobject_get_ownership(kobj, &uid, &gid);
> + newattrs.ia_uid = uid;
> + newattrs.ia_gid = gid;
> +
> + return kernfs_setattr(kn, &newattrs);
> +}
> +
> +/**
> + * sysfs_file_change_owner - change owner of a file.
> + * @kobj: object.
> + * @name: name of the file to change.
> + * can be NULL to change current file.
> + */
> +int sysfs_file_change_owner(struct kobject *kobj, const char *name)
Same meta-question I did for the other call, what does this set the file
owner to? How to you specify this?
I understand your overall goal/need here, I'm just not understanding how
this actually changes anything.
lost,
greg k-h
next prev parent reply other threads:[~2020-02-12 13:19 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 10:43 [PATCH net-next 00/10] net: fix sysfs permssions when device changes network Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 01/10] sysfs: add sysfs_file_change_owner() Christian Brauner
2020-02-12 13:19 ` Greg Kroah-Hartman [this message]
2020-02-12 10:43 ` [PATCH net-next 02/10] sysfs: add sysfs_link_change_owner() Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 03/10] sysfs: add sysfs_group_change_owner() Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 04/10] sysfs: add sysfs_groups_change_owner() Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 05/10] sysfs: add sysfs_change_owner() Christian Brauner
2020-02-12 13:18 ` Greg Kroah-Hartman
2020-02-12 15:07 ` Christian Brauner
2020-02-12 16:04 ` Greg Kroah-Hartman
2020-02-12 10:43 ` [PATCH net-next 06/10] device: add device_change_owner() Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 07/10] drivers/base/power: add dpm_sysfs_change_owner() Christian Brauner
2020-02-12 10:52 ` Rafael J. Wysocki
2020-02-12 10:43 ` [PATCH net-next 08/10] net-sysfs: add netdev_change_owner() Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 09/10] net-sysfs: add queue_change_owner() Christian Brauner
2020-02-12 10:43 ` [PATCH net-next 10/10] net: fix sysfs permssions when device changes network namespace Christian Brauner
2020-02-12 17:53 ` [PATCH net-next 00/10] net: fix sysfs permssions when device changes network David Miller
2020-02-12 18:00 ` Christian Brauner
2020-02-12 18:16 ` David Miller
2020-02-12 18:20 ` Christian Brauner
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