From patchwork Thu Aug 29 14:38:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaldo Carvalho de Melo X-Patchwork-Id: 11121497 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 54CBA14D5 for ; Thu, 29 Aug 2019 14:44:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 31B9B20644 for ; Thu, 29 Aug 2019 14:44:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="J/y85vZv"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="rKIhuAM0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 31B9B20644 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OqxmqtdQ5Mw95rzq7aJwcDKktOEIHHIpL+nuW1b4LTo=; b=J/y85vZvHhwvy3 a/CURVC/sHONm6BVczZNauw1HMBCVPbstb7sO0TbZpwHRnOEc+tY7b5m5eEFBMefd1zuhkF5Ihju8 QwbHS5H4AsDeh6BTJxM1xlh8TaG8W+fkD4Yjcaxhyt9UWAhDSjIzOPt5pt9UCZyBkmuo8t1Yml8lh v4saTUYSjtgFRr/JdGuDCSMj6Kw5PqQPQwEfmjrRzEPJyURLwuSIOLCY2Xm59XEfHUiZbG265USBC 4W506H3yI1PONDpldxEAGg66aNXPcVimRtPlitKwAIelBlUIz3rjyqdxCgyKHKPzncngM+UZu/y1u 0dXrO/ot+FLE/D+GXHGA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i3LfN-0002ZU-UK; Thu, 29 Aug 2019 14:44:50 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i3Lak-0008MG-Vt for linux-arm-kernel@lists.infradead.org; Thu, 29 Aug 2019 14:40:07 +0000 Received: from quaco.ghostprotocols.net (unknown [179.97.35.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4646223428; Thu, 29 Aug 2019 14:39:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567089602; bh=tgXBR6U7m2oGcsdBxVlKdndD6piYs6RX6u2XGg9wlRE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rKIhuAM0fvfIIoaQmyqjFlo3f6NBdNdzGttNnN7jgjXtdJI/7LWAOx0dr5e1hSXI/ r9ck9/gWxGwrpG5W0sVEb7O69YtYKqZjlxlnvycWCbm+m2C8PsbD3ugmR67uZpTeYt vCqQtwtN/LWqVFCFxQXmmcOetmgYubuIjPn5KKQs= From: Arnaldo Carvalho de Melo To: Ingo Molnar , Thomas Gleixner Subject: [PATCH 06/37] perf tools: Warn that perf_event_paranoid can restrict kernel symbols Date: Thu, 29 Aug 2019 11:38:46 -0300 Message-Id: <20190829143917.29745-7-acme@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190829143917.29745-1-acme@kernel.org> References: <20190829143917.29745-1-acme@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190829_074005_723242_634C085D X-CRM114-Status: GOOD ( 10.52 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender 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: Arnaldo Carvalho de Melo , Mathieu Poirier , Suzuki Poulouse , Clark Williams , Alexey Budankov , Igor Lubashev , linux-kernel@vger.kernel.org, James Morris , linux-perf-users@vger.kernel.org, Alexander Shishkin , Peter Zijlstra , Jiri Olsa , Namhyung Kim , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Igor Lubashev Warn that /proc/sys/kernel/perf_event_paranoid can also restrict kernel symbols. Signed-off-by: Igor Lubashev Tested-by: Mathieu Poirier Cc: Alexander Shishkin Cc: Alexey Budankov Cc: James Morris Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Suzuki Poulouse Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1566869956-7154-6-git-send-email-ilubashe@akamai.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-record.c | 2 +- tools/perf/builtin-top.c | 2 +- tools/perf/builtin-trace.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 359bb8f33e57..afe558449677 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -2372,7 +2372,7 @@ int cmd_record(int argc, const char **argv) if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(rec->evlist)) pr_warning( "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" -"check /proc/sys/kernel/kptr_restrict.\n\n" +"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" "Samples in kernel functions may not be resolved if a suitable vmlinux\n" "file is not found in the buildid cache or in the vmlinux path.\n\n" "Samples in kernel modules won't be resolved at all.\n\n" diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 5970723cd55a..29e910fb2d9a 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -770,7 +770,7 @@ static void perf_event__process_sample(struct perf_tool *tool, if (!perf_evlist__exclude_kernel(top->session->evlist)) { ui__warning( "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n" -"Check /proc/sys/kernel/kptr_restrict.\n\n" +"Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" "Kernel%s samples will not be resolved.\n", al.map && map__has_symbols(al.map) ? " modules" : ""); diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 8ea62fd2591d..58a75dd3a571 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -1382,7 +1382,7 @@ static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long l if (symbol_conf.kptr_restrict) { pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n" - "Check /proc/sys/kernel/kptr_restrict.\n\n" + "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" "Kernel samples will not be resolved.\n"); machine->kptr_restrict_warned = true; return NULL;