From patchwork Thu Sep 3 20:30:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11754853 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 232CC1709 for ; Thu, 3 Sep 2020 20:35:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 025DE20678 for ; Thu, 3 Sep 2020 20:35:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="Wwj4fbPi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729367AbgICUfN (ORCPT ); Thu, 3 Sep 2020 16:35:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729556AbgICUcs (ORCPT ); Thu, 3 Sep 2020 16:32:48 -0400 Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E467C0619EB for ; Thu, 3 Sep 2020 13:31:33 -0700 (PDT) Received: by mail-qt1-x84a.google.com with SMTP id o14so912137qtq.0 for ; Thu, 03 Sep 2020 13:31:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=VUJUKDAJ3fJySVYvxhrUakUmsYa/4xrgILfSxrYRNic=; b=Wwj4fbPi0X4rV8ji31fCERDAfpTnzRLf8xMPxrwRhVXDLGp7ngWxWNwA+v4LBiWEmB YGFTUt1J8h8Q9IDtn93wLp6towu+Uzz0TIbXbrbfZtO6RgmfhS6r+88MApP7eBwuPzzN DW/OFqZi7NKkNDi7A83ZbRsI6SNO3BkxDYjeketM1v7R4gGez+E/FlOo3gYRuFx8vaat io6/GE5cD4fYTdIDn1LQ1FLdvfr0pT8D/nN1LKWuMyIt5OhlDEhHxo5rVZrkp7eCwzWP qnE1fjIBfqUbk3LJfHtj99KIwIEVfTb7f+qRhohgyf4crrXFx7faey/ORpIkKO4bzflh zlqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=VUJUKDAJ3fJySVYvxhrUakUmsYa/4xrgILfSxrYRNic=; b=Tne06yaHllj7D0bKGS5Bn0mgfW9AayxrJbZZ3G/fpvBBr6V/tR+WZBwN4MMEEgZGQI idZ9OI0PAqGJp+mlkfvvGLnh9Px/VPyNPulv2k2Sr6fV47lMdhBUjBFyF+4gfQriAP1d YWzTz2m+avxM5eAMcS/3ujs66YuPHpl5HY7ZQzIj1xGP4DKzEBTi+VX9UnlRFCfXokeB dYi0Kx19ZgoN2+Ri9IkIohm/6dpcuHHNRkSWBPlvLJlkrT6DgBlKxla6DoP/aUzZZZ7t o9qSoZJrhLXNjAS7YnzdRzctRvdUDmSEd5ehotR3D9QYNDHOrhYsSTThGMxzamiO+Q5T MFBw== X-Gm-Message-State: AOAM5311WO0++9WJtk3nwd3kYzBb5VSgnbXT7Vgv5g0BaBE3qvsXoHGn nMLcWoTn8ixVt/pX69I+FtHvJEDsgxcLapfFRVI= X-Google-Smtp-Source: ABdhPJySroyUf60EV+GTSZFApKrPtct858Rl6FI3a6v0zzwHhGir8cpo6aRxjOjIFv3aPnhCBpCawXJEnTwed4SP/64= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:292:: with SMTP id l18mr3618298qvv.3.1599165092309; Thu, 03 Sep 2020 13:31:32 -0700 (PDT) Date: Thu, 3 Sep 2020 13:30:43 -0700 In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com> Message-Id: <20200903203053.3411268-19-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.526.ge36021eeef-goog Subject: [PATCH v2 18/28] modpost: lto: strip .lto from module names From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Peter Zijlstra , Steven Rostedt , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org, Sami Tolvanen Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org With LTO, everything is compiled into LLVM bitcode, so we have to link each module into native code before modpost. Kbuild uses the .lto.o suffix for these files, which also ends up in module information. This change strips the unnecessary .lto suffix from the module name. Suggested-by: Bill Wendling Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- scripts/mod/modpost.c | 16 +++++++--------- scripts/mod/modpost.h | 9 +++++++++ scripts/mod/sumversion.c | 6 +++++- 3 files changed, 21 insertions(+), 10 deletions(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 69341b36f271..5a329df55cc3 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -17,7 +17,6 @@ #include #include #include -#include #include #include "modpost.h" #include "../../include/linux/license.h" @@ -80,14 +79,6 @@ modpost_log(enum loglevel loglevel, const char *fmt, ...) exit(1); } -static inline bool strends(const char *str, const char *postfix) -{ - if (strlen(str) < strlen(postfix)) - return false; - - return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; -} - void *do_nofail(void *ptr, const char *expr) { if (!ptr) @@ -1984,6 +1975,10 @@ static char *remove_dot(char *s) size_t m = strspn(s + n + 1, "0123456789"); if (m && (s[n + m] == '.' || s[n + m] == 0)) s[n] = 0; + + /* strip trailing .lto */ + if (strends(s, ".lto")) + s[strlen(s) - 4] = '\0'; } return s; } @@ -2007,6 +2002,9 @@ static void read_symbols(const char *modname) /* strip trailing .o */ tmp = NOFAIL(strdup(modname)); tmp[strlen(tmp) - 2] = '\0'; + /* strip trailing .lto */ + if (strends(tmp, ".lto")) + tmp[strlen(tmp) - 4] = '\0'; mod = new_module(tmp); free(tmp); } diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index 3aa052722233..fab30d201f9e 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -2,6 +2,7 @@ #include #include #include +#include #include #include #include @@ -180,6 +181,14 @@ static inline unsigned int get_secindex(const struct elf_info *info, return info->symtab_shndx_start[sym - info->symtab_start]; } +static inline bool strends(const char *str, const char *postfix) +{ + if (strlen(str) < strlen(postfix)) + return false; + + return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; +} + /* file2alias.c */ extern unsigned int cross_build; void handle_moddevtable(struct module *mod, struct elf_info *info, diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c index d587f40f1117..760e6baa7eda 100644 --- a/scripts/mod/sumversion.c +++ b/scripts/mod/sumversion.c @@ -391,10 +391,14 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen) struct md4_ctx md; char *fname; char filelist[PATH_MAX + 1]; + int postfix_len = 1; + + if (strends(modname, ".lto.o")) + postfix_len = 5; /* objects for a module are listed in the first line of *.mod file. */ snprintf(filelist, sizeof(filelist), "%.*smod", - (int)strlen(modname) - 1, modname); + (int)strlen(modname) - postfix_len, modname); buf = read_text_file(filelist);