From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Miklos Szeredi <mszeredi@redhat.com>,
"Eric W . Biederman" <ebiederm@xmission.com>
Cc: linux-fsdevel@vger.kernel.org, linux-unionfs@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
John Johansen <john.johansen@canonical.com>
Subject: Re: [PATCH v2 00/10] allow unprivileged overlay mounts
Date: Tue, 8 Dec 2020 19:27:13 +0900 [thread overview]
Message-ID: <1725e01a-4d4d-aecb-bad6-54aa220b4cd2@i-love.sakura.ne.jp> (raw)
In-Reply-To: <20201207163255.564116-1-mszeredi@redhat.com>
On 2020/12/08 1:32, Miklos Szeredi wrote:
> A general observation is that overlayfs does not call security_path_*()
> hooks on the underlying fs. I don't see this as a problem, because a
> simple bind mount done inside a private mount namespace also defeats the
> path based security checks. Maybe I'm missing something here, so I'm
> interested in comments from AppArmor and Tomoyo developers.
Regarding TOMOYO, I don't want overlayfs to call security_path_*() hooks on the
underlying fs, but the reason is different. It is not because a simple bind mount
done inside a private mount namespace defeats the path based security checks.
TOMOYO does want to check what device/filesystem is mounted on which location. But
currently TOMOYO is failing to check it due to fsopen()/fsmount()/move_mount() API.
next prev parent reply other threads:[~2020-12-08 10:28 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 16:32 [PATCH v2 00/10] allow unprivileged overlay mounts Miklos Szeredi
2020-12-07 16:32 ` [PATCH v2 01/10] vfs: move cap_convert_nscap() call into vfs_setxattr() Miklos Szeredi
2020-12-09 1:53 ` James Morris
2021-01-01 17:35 ` Eric W. Biederman
2021-01-11 13:49 ` Miklos Szeredi
2021-01-12 0:14 ` Eric W. Biederman
2021-01-12 9:43 ` Miklos Szeredi
2021-01-12 10:04 ` Miklos Szeredi
2021-01-12 18:36 ` Eric W. Biederman
2021-01-12 18:49 ` Eric W. Biederman
2020-12-07 16:32 ` [PATCH v2 02/10] vfs: verify source area in vfs_dedupe_file_range_one() Miklos Szeredi
2020-12-07 16:32 ` [PATCH v2 03/10] ovl: check privs before decoding file handle Miklos Szeredi
2020-12-08 13:49 ` Amir Goldstein
2020-12-09 10:13 ` Miklos Szeredi
2020-12-09 16:20 ` Miklos Szeredi
2020-12-09 18:16 ` Amir Goldstein
2020-12-07 16:32 ` [PATCH v2 04/10] ovl: make ioctl() safe Miklos Szeredi
2020-12-08 11:11 ` Amir Goldstein
2020-12-10 15:18 ` Miklos Szeredi
2020-12-14 5:44 ` Amir Goldstein
2020-12-14 13:23 ` Miklos Szeredi
2020-12-14 14:47 ` Amir Goldstein
2020-12-09 1:57 ` James Morris
2020-12-10 15:19 ` Miklos Szeredi
2020-12-07 16:32 ` [PATCH v2 05/10] ovl: simplify file splice Miklos Szeredi
2020-12-07 16:32 ` [PATCH v2 06/10] ovl: user xattr Miklos Szeredi
2020-12-08 13:10 ` Amir Goldstein
2020-12-11 14:55 ` Miklos Szeredi
2020-12-14 5:13 ` Amir Goldstein
2020-12-07 16:32 ` [PATCH v2 07/10] ovl: do not fail when setting origin xattr Miklos Szeredi
2020-12-07 16:32 ` [PATCH v2 08/10] ovl: do not fail because of O_NOATIME Miklos Szeredi
2020-12-08 11:29 ` Amir Goldstein
2020-12-11 14:44 ` Miklos Szeredi
2020-12-14 5:49 ` Amir Goldstein
2020-12-07 16:32 ` [PATCH v2 09/10] ovl: do not get metacopy for userxattr Miklos Szeredi
2020-12-07 16:32 ` [PATCH v2 10/10] ovl: unprivieged mounts Miklos Szeredi
2020-12-08 10:27 ` Tetsuo Handa [this message]
2020-12-10 8:56 ` [PATCH v2 00/10] allow unprivileged overlay mounts John Johansen
2020-12-10 9:39 ` Miklos Szeredi
2020-12-15 11:03 ` John Johansen
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