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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 0248EC4345D for ; Fri, 17 Jul 2020 17:00:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6B23207EA for ; Fri, 17 Jul 2020 17:00:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728142AbgGQRA4 (ORCPT ); Fri, 17 Jul 2020 13:00:56 -0400 Received: from mga14.intel.com ([192.55.52.115]:45269 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727828AbgGQRAa (ORCPT ); Fri, 17 Jul 2020 13:00:30 -0400 IronPort-SDR: vk6RT8B8QoEsYPs1pJMLvz6Ne19FEsqLhkPzjr88Cb08N3l2WIy5Gn4QouD/6qVnewNF3vy9v7 NobeiVFU2ilg== X-IronPort-AV: E=McAfee;i="6000,8403,9685"; a="148798229" X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="148798229" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 10:00:28 -0700 IronPort-SDR: YD8LS8cLsoXNAWwVei30GXmcCE2h7XpytjuYYlCGZNftLJ3LEHvqt3ks4PtvSBIw+y6vWNjsRH TSCZNWQa1wAQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="270861825" Received: from kcaccard-mobl.amr.corp.intel.com (HELO kcaccard-mobl1.jf.intel.com) ([10.212.33.149]) by fmsmga008.fm.intel.com with ESMTP; 17 Jul 2020 10:00:22 -0700 From: Kristen Carlson Accardi To: keescook@chromium.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, Josh Poimboeuf , Peter Zijlstra Cc: arjan@linux.intel.com, x86@kernel.org, linux-kernel@vger.kernel.org, kernel-hardening@lists.openwall.com, rick.p.edgecombe@intel.com, Kristen Carlson Accardi Subject: [PATCH v4 01/10] objtool: Do not assume order of parent/child functions Date: Fri, 17 Jul 2020 09:59:58 -0700 Message-Id: <20200717170008.5949-2-kristen@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200717170008.5949-1-kristen@linux.intel.com> References: <20200717170008.5949-1-kristen@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If a .cold function is examined prior to it's parent, the link to the parent/child function can be overwritten when the parent is examined. Only update pfunc and cfunc if they were previously nil to prevent this from happening. Signed-off-by: Kristen Carlson Accardi Acked-by: Josh Poimboeuf --- tools/objtool/elf.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 26d11d821941..c18f0f216740 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -434,7 +434,13 @@ static int read_symbols(struct elf *elf) size_t pnamelen; if (sym->type != STT_FUNC) continue; - sym->pfunc = sym->cfunc = sym; + + if (sym->pfunc == NULL) + sym->pfunc = sym; + + if (sym->cfunc == NULL) + sym->cfunc = sym; + coldstr = strstr(sym->name, ".cold"); if (!coldstr) continue; -- 2.20.1