From patchwork Thu Dec 23 00:21:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Lobakin X-Patchwork-Id: 12697651 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 CA38DC4167D for ; Thu, 23 Dec 2021 00:23:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345591AbhLWAXc (ORCPT ); Wed, 22 Dec 2021 19:23:32 -0500 Received: from mga11.intel.com ([192.55.52.93]:24264 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345581AbhLWAXU (ORCPT ); Wed, 22 Dec 2021 19:23:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1640219000; x=1671755000; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=S5S+dp45/rAFDGsVnGP9Us6qzcGYuMHcD0Pjh70Tu7U=; b=mzw9MKhh+K6C0mmiti2qZlgXDecPGIADlFhQfk2wGRk5qt7WbEDK5W5y YpXQwVLKA4ztTosoSI2/2sTuPKbrsJvEleBacWCvBwpkMFEPeksrInojZ prQoSrMj/DRUjoy2hhyXCdlHQhEoRaR6CYmp1lRDuaP270aIzPBXY2TYU Yeey3Q1Pib25re5DPDlCkb0ta1Rz8/3bGDoaXIfFtt5U+xp4ec4WbAJBZ bozjHuQe/BqoOZKfrivoH02TUfJWeBH8vKwq5PpcqGGyiwfdaag+biBZV NmlvyByGVwXgbtZXN1v0dGu1u/gsFNx1V69gUIJXJEHG1KSt1Yx65Zytf g==; X-IronPort-AV: E=McAfee;i="6200,9189,10206"; a="238264168" X-IronPort-AV: E=Sophos;i="5.88,228,1635231600"; d="scan'208";a="238264168" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Dec 2021 16:23:20 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,228,1635231600"; d="scan'208";a="758828846" Received: from irvmail001.ir.intel.com ([10.43.11.63]) by fmsmga005.fm.intel.com with ESMTP; 22 Dec 2021 16:23:12 -0800 Received: from newjersey.igk.intel.com (newjersey.igk.intel.com [10.102.20.203]) by irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id 1BN0N796032467; Thu, 23 Dec 2021 00:23:09 GMT From: Alexander Lobakin To: linux-hardening@vger.kernel.org, x86@kernel.org Cc: Alexander Lobakin , Jesse Brandeburg , Kristen Carlson Accardi , Kees Cook , Miklos Szeredi , Ard Biesheuvel , Tony Luck , Bruce Schlobohm , Jessica Yu , kernel test robot , Miroslav Benes , Evgenii Shatokhin , Jonathan Corbet , Masahiro Yamada , Michal Marek , Nick Desaulniers , Herbert Xu , "David S. Miller" , Thomas Gleixner , Will Deacon , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Arnd Bergmann , Josh Poimboeuf , Nathan Chancellor , Masami Hiramatsu , Marios Pomonis , Sami Tolvanen , "H.J. Lu" , Nicolas Pitre , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-arch@vger.kernel.org, live-patching@vger.kernel.org, llvm@lists.linux.dev, stable@vger.kernel.org Subject: [PATCH v9 01/15] modpost: fix removing numeric suffixes Date: Thu, 23 Dec 2021 01:21:55 +0100 Message-Id: <20211223002209.1092165-2-alexandr.lobakin@intel.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211223002209.1092165-1-alexandr.lobakin@intel.com> References: <20211223002209.1092165-1-alexandr.lobakin@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org For now, that condition from remove_dot(): if (m && (s[n + m] == '.' || s[n + m] == 0)) which was designed to test if it's a dot or a \0 after the suffix is never satisfied. This is due to that s[n + m] always points to the last digit of a numeric suffix, not on the symbol next to it: param_set_uint.0, s[n + m] is '0', s[n + m + 1] is '\0' So it's off by one and was like that since 2014. `-z uniq-symbol` linker flag which we are planning to use to simplify livepatching brings numeric suffixes back, fix this. Otherwise: ERROR: modpost: "param_set_uint.0" [vmlinux] is a static EXPORT_SYMBOL Fixes: fcd38ed0ff26 ("scripts: modpost: fix compilation warning") Cc: stable@vger.kernel.org # 3.17+ Signed-off-by: Alexander Lobakin --- scripts/mod/modpost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index cb8ab7d91d30..ccc6d35580f2 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1971,7 +1971,7 @@ static char *remove_dot(char *s) if (n && s[n]) { size_t m = strspn(s + n + 1, "0123456789"); - if (m && (s[n + m] == '.' || s[n + m] == 0)) + if (m && (s[n + m + 1] == '.' || s[n + m + 1] == 0)) s[n] = 0; /* strip trailing .lto */