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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 26117C43461 for ; Wed, 28 Apr 2021 11:11:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD15F6143F for ; Wed, 28 Apr 2021 11:11:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239179AbhD1LMl (ORCPT ); Wed, 28 Apr 2021 07:12:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:44386 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239657AbhD1LMe (ORCPT ); Wed, 28 Apr 2021 07:12:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 000FD61430; Wed, 28 Apr 2021 11:11:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619608308; bh=6etONi36FQqglhp+rmX4XQZFYwrLi+rQGeMFsiS16n4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e0oUZSt9OdzgTZdJdgabWmOgsh9yFjy8ZUQKl0xw7KyeQoNuozV8ooW3jaY/l1SLY 7q3Zobo6D1zl06AzAlHlxuHMG3XXT+0m5176YQKZNwCxB33KvL8lMo6W0YBhljXlvj 4SmPelo2eUBGANugBQaqYXBh86HBJf7gcv32yHU8moHyPUf1G3nCzdVQO9Bcs/nLWb QuYqlXjsu5fe/NrRcd35L8m/2b3R5oUSmnwrX9e+q7kGhJnkXPo6KXcRmeeM7sr2wm yZh+Mh7CSPSD4rXaiEMM3NHf/d01+Dc4HB4wWkekvOj4UACty8od0Ea8UwFPI25Ih3 B1Mihj6jKK3Pg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Thomas Richter , Alexander Schmidt , Namhyung Kim , Heiko Carstens , Sumanth Korikkar , Sven Schnelle , Vasily Gorbik , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH AUTOSEL 5.10 3/4] perf ftrace: Fix access to pid in array when setting a pid filter Date: Wed, 28 Apr 2021 07:11:40 -0400 Message-Id: <20210428111141.1343299-3-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210428111141.1343299-1-sashal@kernel.org> References: <20210428111141.1343299-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Thomas Richter [ Upstream commit 671b60cb6a897a5b3832fe57657152f2c3995e25 ] Command 'perf ftrace -v -- ls' fails in s390 (at least 5.12.0rc6). The root cause is a missing pointer dereference which causes an array element address to be used as PID. Fix this by extracting the PID. Output before: # ./perf ftrace -v -- ls function_graph tracer is used write '-263732416' to tracing/set_ftrace_pid failed: Invalid argument failed to set ftrace pid # Output after: ./perf ftrace -v -- ls function_graph tracer is used # tracer: function_graph # # CPU DURATION FUNCTION CALLS # | | | | | | | 4) | rcu_read_lock_sched_held() { 4) 0.552 us | rcu_lockdep_current_cpu_online(); 4) 6.124 us | } Reported-by: Alexander Schmidt Signed-off-by: Thomas Richter Acked-by: Namhyung Kim Cc: Heiko Carstens Cc: Sumanth Korikkar Cc: Sven Schnelle Cc: Vasily Gorbik Link: http://lore.kernel.org/lkml/20210421120400.2126433-1-tmricht@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/builtin-ftrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 9366fad591dc..eecc70fc3b19 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -289,7 +289,7 @@ static int set_tracing_pid(struct perf_ftrace *ftrace) for (i = 0; i < perf_thread_map__nr(ftrace->evlist->core.threads); i++) { scnprintf(buf, sizeof(buf), "%d", - ftrace->evlist->core.threads->map[i]); + perf_thread_map__pid(ftrace->evlist->core.threads, i)); if (append_tracing_file("set_ftrace_pid", buf) < 0) return -1; } -- 2.30.2