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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 9755CECE587 for ; Tue, 1 Oct 2019 17:03:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E8A32054F for ; Tue, 1 Oct 2019 17:03:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569949382; bh=NuHhHXw4QZBdglT0kxOOBHpNOn1XLOOMc9cyecLOYBc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ERHLV8j7gPgVUUbcc00Ls4EwSY2OQlNwodcZL1nR/ADJAbDYA7UhC+TfyBVuxtWZ4 rn0S1uUPdLnnOqEJ3f7Vcq0K0WIkDB8456Z19onCQ4Wcmna4BRIok4Eq5U2SbO+rNw M4zlwzshfgAjVM4yif4umhL06mWwtBU473CqcCVQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729086AbfJAQj6 (ORCPT ); Tue, 1 Oct 2019 12:39:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:51040 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728595AbfJAQjz (ORCPT ); Tue, 1 Oct 2019 12:39:55 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2E17921920; Tue, 1 Oct 2019 16:39:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569947995; bh=NuHhHXw4QZBdglT0kxOOBHpNOn1XLOOMc9cyecLOYBc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KFlQ0fe81+Fa8eDae6cTPtZ3TXN5IjIKlTipmtZAqLD+ceBYENQDxSciZyd5oGIOX 5/Pb1J/P/aUugBkn7YY4bW9BFN82ZHf1le/1UJnt5sgoqGcV/Y9SreEB2CZdklgqfY 7wFGsz9wZ/WdY3iDf1E6R07C7V5xht0A8GMeueIc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Masami Hiramatsu , Arnaldo Carvalho de Melo , Jiri Olsa , Namhyung Kim , Wang Nan , Sasha Levin Subject: [PATCH AUTOSEL 5.3 21/71] perf probe: Fix to clear tev->nargs in clear_probe_trace_event() Date: Tue, 1 Oct 2019 12:38:31 -0400 Message-Id: <20191001163922.14735-21-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191001163922.14735-1-sashal@kernel.org> References: <20191001163922.14735-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu [ Upstream commit 9e6124d9d635957b56717f85219a88701617253f ] Since add_probe_trace_event() can reuse tf->tevs[i] after calling clear_probe_trace_event(), this can make perf-probe crash if the 1st attempt of probe event finding fails to find an event argument, and the 2nd attempt fails to find probe point. E.g. $ perf probe -D "task_pid_nr tsk" Failed to find 'tsk' in this function. Failed to get entry address of warn_bad_vsyscall Segmentation fault (core dumped) Committer testing: After the patch: $ perf probe -D "task_pid_nr tsk" Failed to find 'tsk' in this function. Failed to get entry address of warn_bad_vsyscall Failed to get entry address of signal_fault Failed to get entry address of show_signal Failed to get entry address of umip_printk Failed to get entry address of __bad_area_nosemaphore Failed to get entry address of sock_set_timeout Failed to get entry address of tcp_recvmsg Probe point 'task_pid_nr' not found. Error: Failed to add events. $ Fixes: 092b1f0b5f9f ("perf probe: Clear probe_trace_event when add_probe_trace_event() fails") Signed-off-by: Masami Hiramatsu Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lore.kernel.org/lkml/156856587999.25775.5145779959474477595.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/probe-event.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 8394d48f8b32e..3355c445abedf 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -2329,6 +2329,7 @@ void clear_probe_trace_event(struct probe_trace_event *tev) } } zfree(&tev->args); + tev->nargs = 0; } struct kprobe_blacklist_node { -- 2.20.1