linux-kernel - [PATCH 5/3] perf_counter: Require CAP_SYS

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Date:	Mon, 10 Aug 2009 11:27:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>
Subject: [PATCH 5/3] perf_counter: Require CAP_SYS_ADMIN for raw tracepoint
 data

Subject: perf_counter: Require CAP_SYS_ADMIN for raw tracepoint data
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Mon Aug 10 11:20:12 CEST 2009

Raw tracepoint data is a severe data leak, restrict this to root only.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 kernel/perf_counter.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: linux-2.6/kernel/perf_counter.c
===================================================================
--- linux-2.6.orig/kernel/perf_counter.c
+++ linux-2.6/kernel/perf_counter.c
@@ -3788,6 +3788,14 @@ static void tp_perf_counter_destroy(stru
 
 static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
 {
+	/*
+	 * Raw tracepoint data is a severe data leak, only allow root to
+	 * have these.
+	 */
+	if ((counter->attr.sample_type & PERF_SAMPLE_RAW) &&
+			!capable(CAP_SYS_ADMIN))
+		return ERR_PTR(-EPERM);
+
 	if (ftrace_profile_enable(counter->attr.config))
 		return NULL;
 

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