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From: Casey Schaufler <>
To: David Howells <>
Subject: Re: LSM hook for mount, superblock and keys watch notifications
Date: Wed, 1 Aug 2018 14:49:41 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 8/1/2018 2:04 PM, David Howells wrote:
> How about if I apply the attached patch?  It creates a new LSM hook that gets
> called each time a notification is about to be posted on a queue.  It is given
> the creds from the /dev/watch_queue opener, the creds of whoever triggered the
> watchpoint and a pointer to the notification message.
> The notification message includes metadata describing the source/type of the
> message and the subtype within that, plus subtype-specific flags.

This looks like it will solve the problem for security modules.
I still think there should be some sort of default controls.
The idea that the default is that anyone can listen for everyone's
events, and there's no way to control it does not sit well.
You could implement that as a security module with the one hook
that does UID based controls, but I don't see a lot of advantages
to doing it that way. At the least a process should be able to hide
the events it would generate from everyone. Better would be to have
a specification (e.g. mod bits, an ACL) for who should receive them.

  reply	other threads:[~2018-08-01 23:37 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-23 15:25 [RFC][PATCH 0/5] Mount, Filesystem and Keyrings notifications David Howells
2018-07-23 15:25 ` [PATCH 1/5] General notification queue with user mmap()'able ring buffer David Howells
2018-07-23 15:25 ` [PATCH 2/5] KEYS: Add a notification facility David Howells
2018-07-23 15:26 ` [PATCH 3/5] vfs: Add a mount-notification facility David Howells
2018-07-23 15:26 ` [PATCH 4/5] vfs: Add superblock notifications David Howells
2018-07-23 15:26 ` [PATCH 5/5] Add sample notification program David Howells
2018-07-23 16:31 ` [RFC][PATCH 0/5] Mount, Filesystem and Keyrings notifications Casey Schaufler
2018-07-24  0:37   ` Ian Kent
2018-07-24 16:00 ` David Howells
2018-07-24 18:57   ` Casey Schaufler
2018-07-25  5:39     ` Ian Kent
2018-07-25 15:48       ` Casey Schaufler
2018-07-26  1:18         ` Ian Kent
2018-07-26 16:09           ` Casey Schaufler
2018-07-24 19:22   ` David Howells
2018-08-01 21:04 ` LSM hook for mount, superblock and keys watch notifications David Howells
2018-08-01 21:49   ` Casey Schaufler [this message]
2018-08-01 22:50   ` David Howells

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