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=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 8362CC433E0 for ; Fri, 15 May 2020 17:23:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6828F20756 for ; Fri, 15 May 2020 17:23:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726717AbgEORXA (ORCPT ); Fri, 15 May 2020 13:23:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726660AbgEORW6 (ORCPT ); Fri, 15 May 2020 13:22:58 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21447C05BD09; Fri, 15 May 2020 10:22:58 -0700 (PDT) Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jZe2v-0005Tg-Bm; Fri, 15 May 2020 19:22:53 +0200 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 04E3E1C0440; Fri, 15 May 2020 19:22:53 +0200 (CEST) Date: Fri, 15 May 2020 17:22:52 -0000 From: "tip-bot2 for Sami Tolvanen" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: objtool/core] objtool: use gelf_getsymshndx to handle >64k sections Cc: Sami Tolvanen , "Peter Zijlstra (Intel)" , Kees Cook , x86 , LKML In-Reply-To: <20200421220843.188260-2-samitolvanen@google.com> References: <20200421220843.188260-2-samitolvanen@google.com> MIME-Version: 1.0 Message-ID: <158956337293.17951.13387427724649167304.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the objtool/core branch of tip: Commit-ID: 28fe1d7bf89f8ed5be70b98a33932dbaf99345dd Gitweb: https://git.kernel.org/tip/28fe1d7bf89f8ed5be70b98a33932dbaf99345dd Author: Sami Tolvanen AuthorDate: Tue, 21 Apr 2020 15:08:42 -07:00 Committer: Peter Zijlstra CommitterDate: Fri, 15 May 2020 10:35:13 +02:00 objtool: use gelf_getsymshndx to handle >64k sections Currently, objtool fails to load the correct section for symbols when the index is greater than SHN_LORESERVE. Use gelf_getsymshndx instead of gelf_getsym to handle >64k sections. Signed-off-by: Sami Tolvanen Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Kees Cook Link: https://lkml.kernel.org/r/20200421220843.188260-2-samitolvanen@google.com --- tools/objtool/elf.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index b6349ca..8422567 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -343,12 +343,14 @@ static int read_sections(struct elf *elf) static int read_symbols(struct elf *elf) { - struct section *symtab, *sec; + struct section *symtab, *symtab_shndx, *sec; struct symbol *sym, *pfunc; struct list_head *entry; struct rb_node *pnode; int symbols_nr, i; char *coldstr; + Elf_Data *shndx_data = NULL; + Elf32_Word shndx; symtab = find_section_by_name(elf, ".symtab"); if (!symtab) { @@ -356,6 +358,10 @@ static int read_symbols(struct elf *elf) return -1; } + symtab_shndx = find_section_by_name(elf, ".symtab_shndx"); + if (symtab_shndx) + shndx_data = symtab_shndx->data; + symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize; for (i = 0; i < symbols_nr; i++) { @@ -369,8 +375,9 @@ static int read_symbols(struct elf *elf) sym->idx = i; - if (!gelf_getsym(symtab->data, i, &sym->sym)) { - WARN_ELF("gelf_getsym"); + if (!gelf_getsymshndx(symtab->data, shndx_data, i, &sym->sym, + &shndx)) { + WARN_ELF("gelf_getsymshndx"); goto err; } @@ -384,10 +391,13 @@ static int read_symbols(struct elf *elf) sym->type = GELF_ST_TYPE(sym->sym.st_info); sym->bind = GELF_ST_BIND(sym->sym.st_info); - if (sym->sym.st_shndx > SHN_UNDEF && - sym->sym.st_shndx < SHN_LORESERVE) { - sym->sec = find_section_by_index(elf, - sym->sym.st_shndx); + if ((sym->sym.st_shndx > SHN_UNDEF && + sym->sym.st_shndx < SHN_LORESERVE) || + (shndx_data && sym->sym.st_shndx == SHN_XINDEX)) { + if (sym->sym.st_shndx != SHN_XINDEX) + shndx = sym->sym.st_shndx; + + sym->sec = find_section_by_index(elf, shndx); if (!sym->sec) { WARN("couldn't find section for symbol %s", sym->name);