From patchwork Sun May 14 15:27:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 13240497 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 037B9C77B7D for ; Sun, 14 May 2023 15:28:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235354AbjENP2S (ORCPT ); Sun, 14 May 2023 11:28:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237280AbjENP2H (ORCPT ); Sun, 14 May 2023 11:28:07 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4790A3C1B; Sun, 14 May 2023 08:28:03 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 923D4617A6; Sun, 14 May 2023 15:28:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 307E7C4339B; Sun, 14 May 2023 15:28:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1684078082; bh=Sr1ACpmB4VMo9mQd8LPvpsqLdM7Qav5Pbz5xK//K3hU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C4RzBkqjU/bCoauKDTC/QoXDI9/U+s36nixkP2tU6dAs643Z82QUxTNxFlyrYjYKc REvT/e/B8hIcJUuL6Cg8Q+ccot/E3ev0aaEraMSFL0hBXwELtNjDVtTnWgGxcmuG1P +G0//6Ug/hKbo4dQ1HEJdUe2EhZ40YHIIxX3eS5eUPQ5Fzq0hgxLS8KntV1NdYs3gJ zvyM0VHb6nLr2Wg++rnKdJcLMDsg91emd1MuQZlRiiTSt9jbb6snuPYtvR/C/88gKj VDH1nkSQ4QdIzJkqjvMxqWbLyw5AaKO7NhyMx0vKJ74i7pCfbD6+IfynuMxrUw04Yn YubER217qb1rw== From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Nicolas Pitre , Nicolas Schier , Masahiro Yamada Subject: [PATCH v5 07/21] modpost: squash extable_mismatch_handler() into default_mismatch_handler() Date: Mon, 15 May 2023 00:27:25 +0900 Message-Id: <20230514152739.962109-8-masahiroy@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230514152739.962109-1-masahiroy@kernel.org> References: <20230514152739.962109-1-masahiroy@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Merging these two reduces several lines of code. The extable section mismatch is already distinguished by EXTABLE_TO_NON_TEXT. Signed-off-by: Masahiro Yamada Reviewed-by: Nick Desaulniers --- scripts/mod/modpost.c | 84 ++++++++++++++----------------------------- 1 file changed, 26 insertions(+), 58 deletions(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 0bda2f22c985..49357a716519 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -881,27 +881,14 @@ enum mismatch { * targeting sections in this array (white-list). Can be empty. * * @mismatch: Type of mismatch. - * - * @handler: Specific handler to call when a match is found. If NULL, - * default_mismatch_handler() will be called. - * */ struct sectioncheck { const char *fromsec[20]; const char *bad_tosec[20]; const char *good_tosec[20]; enum mismatch mismatch; - void (*handler)(const char *modname, struct elf_info *elf, - const struct sectioncheck* const mismatch, - Elf_Rela *r, Elf_Sym *sym, const char *fromsec); - }; -static void extable_mismatch_handler(const char *modname, struct elf_info *elf, - const struct sectioncheck* const mismatch, - Elf_Rela *r, Elf_Sym *sym, - const char *fromsec); - static const struct sectioncheck sectioncheck[] = { /* Do not reference init/exit code/data from * normal code and data @@ -974,7 +961,6 @@ static const struct sectioncheck sectioncheck[] = { .bad_tosec = { ".altinstr_replacement", NULL }, .good_tosec = {ALL_TEXT_SECTIONS , NULL}, .mismatch = EXTABLE_TO_NON_TEXT, - .handler = extable_mismatch_handler, } }; @@ -1255,60 +1241,42 @@ static void default_mismatch_handler(const char *modname, struct elf_info *elf, modname, tosym, tosec); break; case EXTABLE_TO_NON_TEXT: - fatal("There's a special handler for this mismatch type, we should never get here.\n"); + warn("%s(%s+0x%lx): Section mismatch in reference to the %s:%s\n", + modname, fromsec, (long)r->r_offset, tosec, tosym); + + if (match(tosec, mismatch->bad_tosec)) + fatal("The relocation at %s+0x%lx references\n" + "section \"%s\" which is black-listed.\n" + "Something is seriously wrong and should be fixed.\n" + "You might get more information about where this is\n" + "coming from by using scripts/check_extable.sh %s\n", + fromsec, (long)r->r_offset, tosec, modname); + else if (is_executable_section(elf, get_secindex(elf, sym))) + warn("The relocation at %s+0x%lx references\n" + "section \"%s\" which is not in the list of\n" + "authorized sections. If you're adding a new section\n" + "and/or if this reference is valid, add \"%s\" to the\n" + "list of authorized sections to jump to on fault.\n" + "This can be achieved by adding \"%s\" to\n" + "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n", + fromsec, (long)r->r_offset, tosec, tosec, tosec); + else + error("%s+0x%lx references non-executable section '%s'\n", + fromsec, (long)r->r_offset, tosec); break; } } -static void extable_mismatch_handler(const char* modname, struct elf_info *elf, - const struct sectioncheck* const mismatch, - Elf_Rela* r, Elf_Sym* sym, - const char *fromsec) -{ - const char* tosec = sec_name(elf, get_secindex(elf, sym)); - Elf_Sym *tosym = find_elf_symbol(elf, r->r_addend, sym); - const char *tosym_name = sym_name(elf, tosym); - - sec_mismatch_count++; - - warn("%s(%s+0x%lx): Section mismatch in reference to the %s:%s\n", - modname, fromsec, (long)r->r_offset, tosec, tosym_name); - - if (match(tosec, mismatch->bad_tosec)) - fatal("The relocation at %s+0x%lx references\n" - "section \"%s\" which is black-listed.\n" - "Something is seriously wrong and should be fixed.\n" - "You might get more information about where this is\n" - "coming from by using scripts/check_extable.sh %s\n", - fromsec, (long)r->r_offset, tosec, modname); - else if (is_executable_section(elf, get_secindex(elf, sym))) - warn("The relocation at %s+0x%lx references\n" - "section \"%s\" which is not in the list of\n" - "authorized sections. If you're adding a new section\n" - "and/or if this reference is valid, add \"%s\" to the\n" - "list of authorized sections to jump to on fault.\n" - "This can be achieved by adding \"%s\" to\n" - "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n", - fromsec, (long)r->r_offset, tosec, tosec, tosec); - else - error("%s+0x%lx references non-executable section '%s'\n", - fromsec, (long)r->r_offset, tosec); -} - static void check_section_mismatch(const char *modname, struct elf_info *elf, Elf_Rela *r, Elf_Sym *sym, const char *fromsec) { const char *tosec = sec_name(elf, get_secindex(elf, sym)); const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec); - if (mismatch) { - if (mismatch->handler) - mismatch->handler(modname, elf, mismatch, - r, sym, fromsec); - else - default_mismatch_handler(modname, elf, mismatch, - r, sym, fromsec); - } + if (!mismatch) + return; + + default_mismatch_handler(modname, elf, mismatch, r, sym, fromsec); } static unsigned int *reloc_location(struct elf_info *elf,