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[187.26.98.68]) by smtp.gmail.com with ESMTPSA id p32sm54442466qtb.67.2019.08.12.13.22.53 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 12 Aug 2019 13:22:54 -0700 (PDT) From: Arnaldo Carvalho de Melo X-Google-Original-From: Arnaldo Carvalho de Melo Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id 3F25040340; Mon, 12 Aug 2019 17:22:51 -0300 (-03) Date: Mon, 12 Aug 2019 17:22:51 -0300 To: Igor Lubashev Cc: linux-kernel@vger.kernel.org, Jiri Olsa , Alexey Budankov , Peter Zijlstra , Ingo Molnar , Mathieu Poirier , Alexander Shishkin , Namhyung Kim , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, James Morris Subject: Re: [PATCH v3 4/4] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace Message-ID: <20190812202251.GG9280@kernel.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.12.0 (2019-05-25) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Wed, Aug 07, 2019 at 10:44:17AM -0400, Igor Lubashev escreveu: > Kernel requires CAP_SYS_ADMIN instead of euid==0 to mount debugfs for ftrace. > Make perf do the same. > > Signed-off-by: Igor Lubashev > --- > tools/perf/builtin-ftrace.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c > index ae1466aa3b26..d09eac8a6d57 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -13,6 +13,7 @@ > #include > #include > #include > +#include > > #include "debug.h" > #include > @@ -21,6 +22,7 @@ > #include "target.h" > #include "cpumap.h" > #include "thread_map.h" > +#include "util/cap.h" > #include "util/config.h" > > > @@ -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? > return -1; > } > -- > 2.7.4 -- - Arnaldo