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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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 533A8C433FF for ; Mon, 12 Aug 2019 20:29:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C92D206C2 for ; Mon, 12 Aug 2019 20:29:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="erYZ3Yjo" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727637AbfHLU3z (ORCPT ); Mon, 12 Aug 2019 16:29:55 -0400 Received: from mail-qt1-f195.google.com ([209.85.160.195]:46939 "EHLO mail-qt1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726907AbfHLU3y (ORCPT ); Mon, 12 Aug 2019 16:29:54 -0400 Received: by mail-qt1-f195.google.com with SMTP id j15so10612990qtl.13 for ; Mon, 12 Aug 2019 13:29:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=okQCanS41NVfsqts5AJnKPYxoZvv6fudHvTlcVUrGb4=; b=erYZ3YjobyGfzlBoxLc42M3F2RosVw0ZLJ8jT8ORF/CXfU5fuK1ic4KNz8H7G/MZUc TpEJqrKmiQoupS4h55fSjKWdfsZ9GTdfueOQ6dPAacplMEouOBo48ORxGA+y88n4dI+l +DKmoViQB7lujSgP6zatSKVxGCwL0NPYKdfjB8zbLU38V2osbC9TScaVwcg8aaJgnU2D sCA1ifDiEstx71dcNXDT1gs6OgwSb0meF4fm9mv+AZU01XfZa5C9RphIIX4Mhn6T5/38 AntxHq5JjZ2R2qldCfQuE81uFpKfxjAxLR9OzS8LBgPKduNdddLZ6gtKMhPoVxaEJoBV 0OWw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=okQCanS41NVfsqts5AJnKPYxoZvv6fudHvTlcVUrGb4=; b=It/o8uhAYcV3vH3srCpelZWPcWxuR/zfmEY2vYOcPnQtam3korOe5ThgG7ew3uZx6T y4gYZsZbDJoQ1qf/hmqEr0Y6ylqu6zzBUlozzAIkhD+DtvdbeXSrzjTL+QruWYiC/XZ9 8OEi3cBhEDP/YQwn1voFUwean+WD/lJFWlilZs4zi/wl2ZU30wgdA9jCZ/5hB+HkofzP hrOI4jcIBzUNggRtvMvzJRBn+F6OZtShPO3RpAhy7Bf+MQJ2qKB/y+Tj0e2VYYHTcrPp dOHG4WNtPlOTpcHbTBVhFSlxxNFVoRCMbObg8RKfGItCSfO9b3LR7anPvRZIiC5FXugv HALQ== X-Gm-Message-State: APjAAAVherCG6bXTGp8Rdw1E4OG3LJ5A5GJmuMfeP6QQ61RXmS/IaTOU EQTJfjcCTzUjwgMOaeHzkww= X-Google-Smtp-Source: APXvYqwTpsVawcNiJenRqIgzSQZqFPPVYNx449w5EoHaVgkXcuz2UimxK1d9twMADDsK95KCb7HLpQ== X-Received: by 2002:ac8:6112:: with SMTP id a18mr9255751qtm.272.1565641793538; Mon, 12 Aug 2019 13:29:53 -0700 (PDT) Received: from quaco.ghostprotocols.net (187-26-98-68.3g.claro.net.br. [187.26.98.68]) by smtp.gmail.com with ESMTPSA id f20sm1343362qtf.68.2019.08.12.13.29.50 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 12 Aug 2019 13:29:50 -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 6AA6940340; Mon, 12 Aug 2019 17:29:47 -0300 (-03) Date: Mon, 12 Aug 2019 17:29:47 -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: <20190812202947.GI9280@kernel.org> References: <20190812202251.GG9280@kernel.org> <20190812202706.GH9280@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii 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) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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