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From: Peter Zijlstra <peterz@infradead.org>
To: Jeff Vander Stoep <jeffv@google.com>
Cc: kernel-hardening@lists.openwall.com, mingo@redhat.com,
	acme@kernel.org, alexander.shishkin@linux.intel.com,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [kernel-hardening] Re: [PATCH 1/2] security, perf: allow further restriction of perf_event_open
Date: Tue, 2 Aug 2016 11:52:43 +0200
Message-ID: <20160802095243.GD6862@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1469630746-32279-1-git-send-email-jeffv@google.com>

On Wed, Jul 27, 2016 at 07:45:46AM -0700, Jeff Vander Stoep wrote:
> When kernel.perf_event_paranoid is set to 3 (or greater), disallow
> all access to performance events by users without CAP_SYS_ADMIN.
> 
> This new level of restriction is intended to reduce the attack
> surface of the kernel. Perf is a valuable tool for developers but
> is generally unnecessary and unused on production systems. Perf may
> open up an attack vector to vulnerable device-specific drivers as
> recently demonstrated in CVE-2016-0805, CVE-2016-0819,
> CVE-2016-0843, CVE-2016-3768, and CVE-2016-3843.

We have bugs we fix them, we don't kill complete infrastructure because
of them.

> This new level of
> restriction allows for a safe default to be set on production systems
> while leaving a simple means for developers to grant access [1].

So the problem I have with this is that it will completely inhibit
development of things like JITs that self-profile to re-compile
frequently used code.

I would much rather have an LSM hook where the security stuff can do
more fine grained control of things. Allowing some apps perf usage while
denying others.

  parent reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-27 14:45 [kernel-hardening] " Jeff Vander Stoep
2016-07-27 20:43 ` Kees Cook
2016-08-02  9:52 ` Peter Zijlstra [this message]
2016-08-02 13:04   ` [kernel-hardening] " Arnaldo Carvalho de Melo
2016-08-02 13:10     ` Daniel Micay
2016-08-02 13:16   ` Daniel Micay
2016-08-02 19:04   ` Kees Cook
2016-08-02 20:30     ` Peter Zijlstra
2016-08-02 20:51       ` Kees Cook
2016-08-02 21:06         ` Jeffrey Vander Stoep
2016-08-03  8:28         ` Ingo Molnar
2016-08-03 12:28           ` Daniel Micay
2016-08-03 12:53             ` Daniel Micay
2016-08-03 13:36             ` Peter Zijlstra
2016-08-03 14:41         ` Peter Zijlstra
2016-08-03 15:42           ` Schaufler, Casey
2016-08-03 17:25         ` Eric W. Biederman
2016-08-03 18:53           ` Kees Cook
2016-08-03 21:44             ` Peter Zijlstra
2016-08-04  2:50               ` Eric W. Biederman
2016-08-04  9:11                 ` Peter Zijlstra
2016-08-04 15:13                   ` Eric W. Biederman
2016-08-04 15:37                     ` Peter Zijlstra
2016-08-03 19:36           ` Daniel Micay
2016-08-04 10:28             ` Mark Rutland
2016-08-04 13:45               ` Daniel Micay
2016-08-04 14:11                 ` Peter Zijlstra
2016-08-04 15:44                   ` Daniel Micay
2016-08-04 15:55                     ` Peter Zijlstra
2016-08-04 16:10                     ` Mark Rutland
2016-08-04 16:32                       ` Daniel Micay
2016-08-04 17:09                         ` Mark Rutland
2016-08-04 17:36                           ` Daniel Micay
2016-08-02 21:16       ` Jeffrey Vander Stoep
2016-10-17 13:44 ` [kernel-hardening] " Mark Rutland
2016-10-17 14:54   ` Daniel Micay
2016-10-19  9:41     ` Mark Rutland
2016-10-19 15:16       ` Daniel Micay
2016-10-18 20:48   ` Kees Cook
2016-10-18 21:15     ` Daniel Micay
2016-10-19  9:56       ` Mark Rutland
2016-10-19 10:01       ` Peter Zijlstra
2016-10-19 10:26         ` Arnaldo Carvalho de Melo
2016-10-19 10:40           ` Peter Zijlstra
2016-10-19 15:39           ` Daniel Micay

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