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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7AE1C433EF for ; Sat, 23 Jul 2022 09:56:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237419AbiGWJ4r (ORCPT ); Sat, 23 Jul 2022 05:56:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237374AbiGWJ4p (ORCPT ); Sat, 23 Jul 2022 05:56:45 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D10D3207C; Sat, 23 Jul 2022 02:56:37 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id EAD73B82C1B; Sat, 23 Jul 2022 09:56:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B5EFC341C0; Sat, 23 Jul 2022 09:56:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1658570194; bh=tB83HSTYttxr8QeYTHDKAIaxQNlUjPWiBjASejzuzWM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZhCz+2yS29EZ1nuIXGkT0BT4nPr1dHz5IMyPDnzT6f5WZaywXL6o1bswKVa56/a5J PMcdysnJ5z9zQJ+ikEocEbHW5CJcqKm0Fc3bKlpdfN0i5gZVPvPWzZjOZXUv1P7kxt YgSO1WT/GPtwoZoQj3s6DV0P06LQ7fsQJYUIs0zU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Josh Poimboeuf , Ben Hutchings Subject: [PATCH 5.10 004/148] objtool: Add alt_group struct Date: Sat, 23 Jul 2022 11:53:36 +0200 Message-Id: <20220723095225.568104100@linuxfoundation.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220723095224.302504400@linuxfoundation.org> References: <20220723095224.302504400@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Josh Poimboeuf commit b23cc71c62747f2e4c3e56138872cf47e1294f8a upstream. Create a new struct associated with each group of alternatives instructions. This will help with the removal of fake jumps, and more importantly with adding support for stack layout changes in alternatives. Signed-off-by: Josh Poimboeuf Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- tools/objtool/check.c | 29 +++++++++++++++++++++++------ tools/objtool/check.h | 13 ++++++++++++- 2 files changed, 35 insertions(+), 7 deletions(-) --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1012,20 +1012,28 @@ static int handle_group_alt(struct objto struct instruction *orig_insn, struct instruction **new_insn) { - static unsigned int alt_group_next_index = 1; struct instruction *last_orig_insn, *last_new_insn, *insn, *fake_jump = NULL; - unsigned int alt_group = alt_group_next_index++; + struct alt_group *orig_alt_group, *new_alt_group; unsigned long dest_off; + + orig_alt_group = malloc(sizeof(*orig_alt_group)); + if (!orig_alt_group) { + WARN("malloc failed"); + return -1; + } last_orig_insn = NULL; insn = orig_insn; sec_for_each_insn_from(file, insn) { if (insn->offset >= special_alt->orig_off + special_alt->orig_len) break; - insn->alt_group = alt_group; + insn->alt_group = orig_alt_group; last_orig_insn = insn; } + orig_alt_group->orig_group = NULL; + orig_alt_group->first_insn = orig_insn; + orig_alt_group->last_insn = last_orig_insn; if (next_insn_same_sec(file, last_orig_insn)) { fake_jump = malloc(sizeof(*fake_jump)); @@ -1056,8 +1064,13 @@ static int handle_group_alt(struct objto return 0; } + new_alt_group = malloc(sizeof(*new_alt_group)); + if (!new_alt_group) { + WARN("malloc failed"); + return -1; + } + last_new_insn = NULL; - alt_group = alt_group_next_index++; insn = *new_insn; sec_for_each_insn_from(file, insn) { struct reloc *alt_reloc; @@ -1069,7 +1082,7 @@ static int handle_group_alt(struct objto insn->ignore = orig_insn->ignore_alts; insn->func = orig_insn->func; - insn->alt_group = alt_group; + insn->alt_group = new_alt_group; /* * Since alternative replacement code is copy/pasted by the @@ -1118,6 +1131,10 @@ static int handle_group_alt(struct objto return -1; } + new_alt_group->orig_group = orig_alt_group; + new_alt_group->first_insn = *new_insn; + new_alt_group->last_insn = last_new_insn; + if (fake_jump) list_add(&fake_jump->list, &last_new_insn->list); @@ -2440,7 +2457,7 @@ static int validate_return(struct symbol static void fill_alternative_cfi(struct objtool_file *file, struct instruction *insn) { struct instruction *first_insn = insn; - int alt_group = insn->alt_group; + struct alt_group *alt_group = insn->alt_group; sec_for_each_insn_continue(file, insn) { if (insn->alt_group != alt_group) --- a/tools/objtool/check.h +++ b/tools/objtool/check.h @@ -19,6 +19,17 @@ struct insn_state { s8 instr; }; +struct alt_group { + /* + * Pointer from a replacement group to the original group. NULL if it + * *is* the original group. + */ + struct alt_group *orig_group; + + /* First and last instructions in the group */ + struct instruction *first_insn, *last_insn; +}; + struct instruction { struct list_head list; struct hlist_node hash; @@ -34,7 +45,7 @@ struct instruction { s8 instr; u8 visited; u8 ret_offset; - int alt_group; + struct alt_group *alt_group; struct symbol *call_dest; struct instruction *jump_dest; struct instruction *first_jump_src;