From: Jan Kara <jack@suse.cz>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Seth Forshee <seth.forshee@canonical.com>,
Linux Containers <containers@lists.linux-foundation.org>,
linux-fsdevel@vger.kernel.org,
Linux API <linux-api@vger.kernel.org>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
Djalal Harouni <tixxdz@gmail.com>,
"Serge E. Hallyn" <serge@hallyn.com>,
Andy Lutomirski <luto@amacapital.net>, Jan Kara <jack@suse.cz>,
Jann Horn <jannh@google.com>,
Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH review 0/11] General unprivileged mount support
Date: Mon, 4 Jul 2016 10:52:20 +0200 [thread overview]
Message-ID: <20160704085220.GC5200@quack2.suse.cz> (raw)
In-Reply-To: <87ziq03qnj.fsf@x220.int.ebiederm.org>
On Sat 02-07-16 12:18:08, Eric W. Biederman wrote:
>
> As well as in these patches the code is also available from:
> git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-testing
>
> It has been a long time in coming but recently in the userns tree the
> superblock has been expanded with a s_user_ns field indicating the user
> namespace that owns a superblock.
>
> The s_user_ns owner of a superblock has three implications.
> - Only kuids and kgids that map into s_user_ns are allowed to be sent to a
> filesystem from the vfs.
> - If the uid or gid on the filesystem does not map into s_user_ns i_uid
> is set to INVALID_UID and i_gid is set to INVALID_GID.
> - The scope of permission checks can be changed from global to a
> capabilitiy check in s_user_ns.
OK, to check that I understand it right:
So the uids and gids that are stored on disk are still expected to be in
the initial id namespace, aren't they?
Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2016-07-04 8:52 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-02 17:18 [PATCH review 0/11] General unprivileged mount support Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 01/11] fs: Refuse uid/gid changes which don't map into s_user_ns Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 02/11] userns: Handle -1 in k[ug]id_has_mapping when !CONFIG_USER_NS Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 03/11] vfs: Verify acls are valid within superblock's s_user_ns Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 04/11] fs: Check for invalid i_uid in may_follow_link() Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 05/11] cred: Reject inodes with invalid ids in set_create_file_as() Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 06/11] vfs: Don't modify inodes with a uid or gid unknown to the vfs Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 07/11] vfs: Don't create " Eric W. Biederman
2016-07-04 7:59 ` Jan Kara
2016-07-05 14:55 ` Eric W. Biederman
2016-07-06 9:07 ` Jan Kara
2016-07-06 15:37 ` Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 08/11] quota: Ensure qids map to the filesystem Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 09/11] quota: Handle quota data stored in s_user_ns Eric W. Biederman
2016-07-02 17:33 ` [PATCH v2 " Eric W. Biederman
2016-07-04 9:11 ` Jan Kara
2016-07-05 14:48 ` Seth Forshee
2016-07-05 15:34 ` Eric W. Biederman
2016-07-05 20:57 ` Dave Chinner
2016-07-05 21:28 ` Eric W. Biederman
2016-07-06 6:35 ` Dave Chinner
2016-07-06 8:25 ` Jan Kara
2016-07-06 17:51 ` Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 10/11] evm: Translate user/group ids relative to s_user_ns when computing HMAC Eric W. Biederman
2016-07-02 17:20 ` [PATCH review 11/11] fs: Update i_[ug]id_(read|write) to translate relative to s_user_ns Eric W. Biederman
2016-07-04 8:52 ` Jan Kara [this message]
2016-07-04 16:27 ` [PATCH review 0/11] General unprivileged mount support Eric W. Biederman
2016-07-06 8:54 ` Jan Kara
2016-07-06 13:54 ` Seth Forshee
2016-07-06 14:22 ` Jan Kara
2016-07-06 14:46 ` Seth Forshee
2016-07-06 15:01 ` Eric W. Biederman
2016-07-06 15:23 ` James Bottomley
2016-07-06 16:35 ` Eric W. Biederman
2016-07-06 13:44 ` Andy Lutomirski
2016-07-06 15:21 ` Eric W. Biederman
2016-07-06 14:01 ` Andy Lutomirski
2016-07-06 15:19 ` Eric W. Biederman
2016-07-06 18:10 ` [PATCH review 0/12] General unprivileged mount support v2 Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 01/12] fs: Refuse uid/gid changes which don't map into s_user_ns Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 02/12] userns: Handle -1 in k[ug]id_has_mapping when !CONFIG_USER_NS Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 03/12] vfs: Verify acls are valid within superblock's s_user_ns Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 04/12] fs: Check for invalid i_uid in may_follow_link() Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 05/12] cred: Reject inodes with invalid ids in set_create_file_as() Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 06/12] vfs: Don't modify inodes with a uid or gid unknown to the vfs Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 07/12] vfs: Don't create " Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 08/12] quota: Ensure qids map to the filesystem Eric W. Biederman
2016-07-11 10:14 ` Jan Kara
2016-07-11 18:12 ` Eric W. Biederman
2016-07-13 1:34 ` Dave Chinner
2016-07-13 3:45 ` Dave Chinner
2016-07-13 5:43 ` Jann Horn
2016-07-14 17:03 ` Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 09/12] quota: Handle quota data stored in s_user_ns in quota_setxquota Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 10/12] dquot: For now explicitly don't support filesystems outside of init_user_ns Eric W. Biederman
2016-07-11 10:09 ` Jan Kara
2016-07-06 18:12 ` [PATCH review 11/12] evm: Translate user/group ids relative to s_user_ns when computing HMAC Eric W. Biederman
2016-07-06 18:12 ` [PATCH review 12/12] fs: Update i_[ug]id_(read|write) to translate relative to s_user_ns Eric W. Biederman
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