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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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  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 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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