From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1949136AbbEBT7w (ORCPT ); Sat, 2 May 2015 15:59:52 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:46726 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1949107AbbEBTuL (ORCPT ); Sat, 2 May 2015 15:50:11 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anton Blanchard , Michael Ellerman Subject: [PATCH 3.10 37/65] powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH Date: Sat, 2 May 2015 21:04:07 +0200 Message-Id: <20150502190117.367009758@linuxfoundation.org> X-Mailer: git-send-email 2.3.7 In-Reply-To: <20150502190114.555225285@linuxfoundation.org> References: <20150502190114.555225285@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Anton Blanchard commit 9a5cbce421a283e6aea3c4007f141735bf9da8c3 upstream. We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH (currently 127), but we forgot to do the same for 64bit backtraces. Signed-off-by: Anton Blanchard Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/perf/callchain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -243,7 +243,7 @@ static void perf_callchain_user_64(struc sp = regs->gpr[1]; perf_callchain_store(entry, next_ip); - for (;;) { + while (entry->nr < PERF_MAX_STACK_DEPTH) { fp = (unsigned long __user *) sp; if (!valid_user_sp(sp, 1) || read_user_stack_64(fp, &next_sp)) return;