From: Andi Kleen <ak@linux.intel.com>
To: John Wood <john.wood@gmx.com>
Cc: kernel-hardening@lists.openwall.com,
"Valdis Klētnieks" <valdis.kletnieks@vt.edu>,
"Kees Cook" <keescook@chromium.org>,
kernelnewbies@kernelnewbies.org
Subject: Re: Notify special task kill using wait* functions
Date: Fri, 9 Apr 2021 08:06:21 -0700 [thread overview]
Message-ID: <20210409150621.GJ3762101@tassilo.jf.intel.com> (raw)
In-Reply-To: <20210409142933.GA3150@ubuntu>
> > Any caching of state is inherently insecure because any caches of limited
> > size can be always thrashed by a purposeful attacker. I suppose the
> > only thing that would work is to actually write something to the
> > executable itself on disk, but of course that doesn't always work either.
>
> I'm also working on this. In the next version I will try to find a way to
> prevent brute force attacks through the execve system call with more than
> one level of forking.
Thanks.
Thinking more about it what I wrote above wasn't quite right. The cache
would only need to be as big as the number of attackable services/suid
binaries. Presumably on many production systems that's rather small,
so a cache (which wouldn't actually be a cache, but a complete database)
might actually work.
-Andi
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next prev parent reply other threads:[~2021-04-09 15:06 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-30 17:34 Notify special task kill using wait* functions John Wood
2021-03-30 18:40 ` Valdis Klētnieks
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 [this message]
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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