linux-kernel - Re: [kernel-hardening] Re: [PATCH 1/2] security, perf: allow further restriction of perf_event

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Date:	Wed, 03 Aug 2016 08:53:21 -0400
From:	Daniel Micay <danielmicay@...il.com>
To:	kernel-hardening@...ts.openwall.com,
	Kees Cook <keescook@...omium.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Jeff Vander Stoep <jeffv@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [kernel-hardening] Re: [PATCH 1/2] security, perf: allow
 further restriction of perf_event_open

Having this in Yama would also make it probable that there would be a
security-centric default. It would end up wiping out unprivileged perf
events access on distributions using Yama for ptrace_scope unless they
make the explicit decision to disable it. Having the perf subsystem
extend the existing perf_event_paranoid sysctl leaves the control over
the upstream default in the hands of the perf subsystem, not LSMs.
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