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From: "Valdis Klētnieks" <valdis.kletnieks@vt.edu>
To: John Wood <john.wood@gmx.com>
Cc: kernelnewbies@kernelnewbies.org
Subject: Re: Notify special task kill using wait* functions
Date: Tue, 30 Mar 2021 14:40:38 -0400	[thread overview]
Message-ID: <79804.1617129638@turing-police> (raw)
In-Reply-To: <20210330173459.GA3163@ubuntu>


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On Tue, 30 Mar 2021 19:34:59 +0200, John Wood said:

> The question is: How can I notify to wait* functions that the task has
> been killed by the "Brute" LSM.

What wait* functions even *care* that your LSM was what killed it?

If you're caring about somehow notifying userspace that it was your LSM
specifically, remember that if your code works properly, only attackers
get notified - and they can then determine "Ah, this system has Brute installed,
we need to back off and fly under its radar".

You're much better off sending a SIGKILL to the entire process group
and be done with it. That way the bad guys get less information.

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  reply	other threads:[~2021-03-30 18:41 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-30 17:34 John Wood
2021-03-30 18:40 ` Valdis Klētnieks [this message]
2021-04-02 12:49   ` John Wood
2021-04-03  3:50     ` Valdis Klētnieks
2021-04-03  7:02       ` John Wood
2021-04-03 21:34         ` Valdis Klētnieks
2021-04-04  9:48           ` John Wood
2021-04-04 21:10             ` Valdis Klētnieks
2021-04-05  7:31               ` John Wood
2021-04-06 23:55                 ` Valdis Klētnieks
2021-04-07 17:51                   ` John Wood
2021-04-07 20:38                     ` Valdis Klētnieks
2021-04-08  1:51                       ` Andi Kleen
2021-04-09 14:29                         ` John Wood
2021-04-09 15:06                           ` Andi Kleen
2021-04-09 16:08                             ` John Wood
2021-04-09 23:28                             ` Valdis Klētnieks
2021-04-11  8:46                               ` John Wood

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