From: Andy Lutomirski <luto@amacapital.net>
To: David Howells <dhowells@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Casey Schaufler <casey@schaufler-ca.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
Al Viro <viro@zeniv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
USB list <linux-usb@vger.kernel.org>,
raven@themaw.net, Linux FS Devel <linux-fsdevel@vger.kernel.org>,
Linux API <linux-api@vger.kernel.org>,
linux-block@vger.kernel.org, keyrings@vger.kernel.org,
LSM List <linux-security-module@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Paul Moore <paul@paul-moore.com>
Subject: Re: [RFC][PATCH 00/10] Mount, FS, Block and Keyrings notifications [ver #3]
Date: Thu, 6 Jun 2019 15:42:06 -0700 [thread overview]
Message-ID: <D2BD8FEB-5DF5-449B-AF81-83BA65E0E643@amacapital.net> (raw)
In-Reply-To: <30567.1559860681@warthog.procyon.org.uk>
> On Jun 6, 2019, at 3:38 PM, David Howells <dhowells@redhat.com> wrote:
>
> Andy Lutomirski <luto@amacapital.net> wrote:
>
>> I mean: are there cases where some action generates a notification but does
>> not otherwise have an effect visible to the users who can receive the
>> notification. It looks like the answer is probably “no”, which is good.
>
> mount_notify(). You can get a notification that someone altered the mount
> topology (eg. by mounting something). A process receiving a notification
> could then use fsinfo(), say, to reread the mount topology tree, find out
> where the new mount is and wander over there to have a look - assuming they
> have the permissions for pathwalk to succeed.
>
>
They can call fsinfo() anyway, or just read /proc/self/mounts. As far as I’m concerned, if you have CAP_SYS_ADMIN over a mount namespace and LSM policy lets you mount things, the of course you can get information to basically anyone who can use that mount namespace.
next prev parent reply other threads:[~2019-06-06 22:42 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 9:41 [RFC][PATCH 00/10] Mount, FS, Block and Keyrings notifications [ver #3] David Howells
2019-06-06 9:43 ` [PATCH 09/10] usb: Add USB subsystem " David Howells
2019-06-06 14:24 ` Alan Stern
2019-06-06 14:33 ` Greg Kroah-Hartman
2019-06-06 14:55 ` Alan Stern
2019-06-06 15:31 ` Greg Kroah-Hartman
2019-06-07 6:40 ` Felipe Balbi
2019-06-07 14:01 ` Alan Stern
2019-06-11 6:28 ` Felipe Balbi
2019-06-11 13:53 ` Alan Stern
2019-06-12 6:58 ` Felipe Balbi
2019-06-06 12:32 ` [RFC][PATCH 00/10] Mount, FS, Block and Keyrings " Stephen Smalley
2019-06-06 13:16 ` David Howells
2019-06-06 14:05 ` Stephen Smalley
2019-06-06 16:43 ` Casey Schaufler
2019-06-06 17:11 ` Andy Lutomirski
2019-06-06 18:33 ` Casey Schaufler
2019-06-06 18:51 ` Andy Lutomirski
2019-06-06 17:16 ` Stephen Smalley
2019-06-06 18:56 ` Casey Schaufler
2019-06-06 19:54 ` Andy Lutomirski
2019-06-06 21:17 ` David Howells
2019-06-06 21:54 ` Andy Lutomirski
2019-06-06 22:38 ` David Howells
2019-06-06 22:42 ` Andy Lutomirski [this message]
2019-06-06 22:50 ` David Howells
2019-06-06 14:34 ` Christian Brauner
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