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Received: from 187-26-98-68.3g.claro.net.br ([187.26.98.68] helo=quaco.ghostprotocols.net) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hxGwv-0004cY-Qm; Mon, 12 Aug 2019 20:29:50 +0000 Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id 6AA6940340; Mon, 12 Aug 2019 17:29:47 -0300 (-03) Date: Mon, 12 Aug 2019 17:29:47 -0300 From: Arnaldo Carvalho de Melo To: Igor Lubashev Subject: Re: [PATCH v3 4/4] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace Message-ID: <20190812202947.GI9280@kernel.org> References: <20190812202251.GG9280@kernel.org> <20190812202706.GH9280@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190812202706.GH9280@kernel.org> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.12.0 (2019-05-25) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mathieu Poirier , Suzuki K Poulose , Peter Zijlstra , Alexey Budankov , linux-kernel@vger.kernel.org, James Morris , Alexander Shishkin , Ingo Molnar , Namhyung Kim , Jiri Olsa , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Em Mon, Aug 12, 2019 at 05:27:06PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Mon, Aug 12, 2019 at 05:22:51PM -0300, Arnaldo Carvalho de Melo escreveu: > > Em Wed, Aug 07, 2019 at 10:44:17AM -0400, Igor Lubashev escreveu: > > > @@ -281,7 +283,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) > > > .events = POLLIN, > > > }; > > > > > > - if (geteuid() != 0) { > > > + if (!perf_cap__capable(CAP_SYS_ADMIN)) { > > > pr_err("ftrace only works for root!\n"); > > > > I guess we should update the error message too? > > > > I.e. I applied this as a follow up patch: > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index 01a5bb58eb04..ba8b65c2f9dc 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -284,7 +284,12 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv) > }; > > if (!perf_cap__capable(CAP_SYS_ADMIN)) { > - pr_err("ftrace only works for root!\n"); > + pr_err("ftrace only works for %s!\n", > +#ifdef HAVE_LIBCAP_SUPPORT > + "users with the SYS_ADMIN capability" > +#else > + "root" > +#endif ); :-) > return -1; > } > I've pushed the whole set to my tmp.perf/cap branch, please chec - Arnaldo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel