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=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 B0A5DC433DF for ; Mon, 8 Jun 2020 23:33:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8753020823 for ; Mon, 8 Jun 2020 23:33:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591659188; bh=LM/du8b8FjrYi1EUgb3XJShtRGgCq7C3Ef2V21ibtII=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uo/OMDtyWWg2YZoP76PGS1kIFGuHVIjnmdB9zfS0E+12BHsN7frMYWwjT2QgEhbiI VeJmhyyFavHMrA4wxm6Qd5XurcSmYoaeFGRGR+oahKP7qZZZbpdVPHcO8y+rn6qxgX PHHw7MNdbfr2sNvwml1G4YIBlkuPyZujVsOsb63Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732532AbgFHXdH (ORCPT ); Mon, 8 Jun 2020 19:33:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:54622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732028AbgFHX0q (ORCPT ); Mon, 8 Jun 2020 19:26:46 -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 E7AFE20853; Mon, 8 Jun 2020 23:26:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591658805; bh=LM/du8b8FjrYi1EUgb3XJShtRGgCq7C3Ef2V21ibtII=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BG8sA0cQD/Oehjf530yPfidgcR08NEuIwSSyJfWzlnfdYpuI8A842RhKyJ4wJ+vPl E4V7TqjntyOk9zwh4ypC3WiCe5bS/130Iwsrf/VHw4ZOvXJU12V9Ou7eCCZ0jyez1r YItuW95OiDaJAWlAfSGRSffbm03KEFW5a1tfJkXw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Julien Thierry , Peter Zijlstra , Miroslav Benes , Josh Poimboeuf , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL 4.9 04/50] objtool: Ignore empty alternatives Date: Mon, 8 Jun 2020 19:25:54 -0400 Message-Id: <20200608232640.3370262-4-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200608232640.3370262-1-sashal@kernel.org> References: <20200608232640.3370262-1-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: Julien Thierry [ Upstream commit 7170cf47d16f1ba29eca07fd818870b7af0a93a5 ] The .alternatives section can contain entries with no original instructions. Objtool will currently crash when handling such an entry. Just skip that entry, but still give a warning to discourage useless entries. Signed-off-by: Julien Thierry Acked-by: Peter Zijlstra (Intel) Reviewed-by: Miroslav Benes Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- tools/objtool/check.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index b0b8ba9b800c..c7399d7f4bc7 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -778,6 +778,12 @@ static int add_special_section_alts(struct objtool_file *file) } if (special_alt->group) { + if (!special_alt->orig_len) { + WARN_FUNC("empty alternative entry", + orig_insn->sec, orig_insn->offset); + continue; + } + ret = handle_group_alt(file, special_alt, orig_insn, &new_insn); if (ret) -- 2.25.1