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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 CADC4C2D0DB for ; Thu, 30 Jan 2020 18:00:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A2958206F0 for ; Thu, 30 Jan 2020 18:00:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="c62MQ+Mr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727650AbgA3SAy (ORCPT ); Thu, 30 Jan 2020 13:00:54 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:46076 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727639AbgA3SAy (ORCPT ); Thu, 30 Jan 2020 13:00:54 -0500 Received: by mail-pg1-f193.google.com with SMTP id b9so2022113pgk.12 for ; Thu, 30 Jan 2020 10:00:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=bpcbVebQMddVeSOdQYLefZ6gpfj1PnXmD5uZeNqvneY=; b=c62MQ+Mr49Lf+AKq6Ooxx01eMlVpwUC94FEWJIf0le/xPYYXPgzNKS70R/EkjXV7n1 w6A6sDUIRHyVegnrqYo/kqzvig9MswHecET09VQ3Vl298frizQbaIEpskulEFhmQGElY RB08UUtBAq/R7uZi0/R0lUg0XZbrDuLebAmKhkihk7fekBM9y+AWP8pfJYCInyFZiPWg /s3I8SJvzS3B7tQN9x0tpHotneAPGQXUxBa3mhLqdNi4bKFPnnj59lhuIEd/MPQ9YnrB t6r/k5kMbAx815QrHGbeVBuBqcOQl+te2tlJaCgewhlnOI+hk/AY0rNEDWfUmvsokxdA ZXyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=bpcbVebQMddVeSOdQYLefZ6gpfj1PnXmD5uZeNqvneY=; b=VQf0rc09XhWTWtfnWHr4qzWvIgIjY2f7QpyMPQ/IhHLqTaJNjrP2mXJtQ+kDSwJYv2 BRbuBcmWHgJRRjdUxyUEKoY/HLmnHIIDgevpC1LZy9IAjHlyhSQe591QDcLaymkopnjF RTdVZS4kkAq0A9DJGBSUe4jH2WPUuSB0FArpslLP4OFffGZTMiMFjJGNCgzWAAzN1Uki 31cmSJxirB5Y+Edc0cXsCLIUf1Z0kpgC45pHdx6ImWDerVElCdBCPIonl7yPxcf98kl4 V46+1IEq+3jQQkq6KPOCvoyvvIb1kgUoB6RhFTCSBw4gnzLa7PrTiy1MjGMibTnwQ9Cr VC3Q== X-Gm-Message-State: APjAAAVK6g3xEutk2zN/w7Q7gnWMId93Qu9bsV+nuqOlpuPFBXKBVXGI rrh/br+ypliblS5EItIHQ3o= X-Google-Smtp-Source: APXvYqzGAblEZZfh3pLwJQVKwRaYggWGdw4o1XfZdQq1iCyg6J+swomrVs2SkmbQOO/swbGFvf2vtg== X-Received: by 2002:a63:696:: with SMTP id 144mr6205330pgg.260.1580407252164; Thu, 30 Jan 2020 10:00:52 -0800 (PST) Received: from gnu-efi-2.localdomain ([2607:fb90:a7b9:27d7:eac5:2229:91f5:d315]) by smtp.gmail.com with ESMTPSA id k12sm7004764pgm.65.2020.01.30.10.00.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jan 2020 10:00:51 -0800 (PST) Received: from gnu-efi-2.localdomain (localhost [IPv6:::1]) by gnu-efi-2.localdomain (Postfix) with ESMTP id 170E9100820; Thu, 30 Jan 2020 10:00:49 -0800 (PST) From: "H.J. Lu" To: linux-kernel@vger.kernel.org Cc: Andy Lutomirski , Thomas Gleixner , Kees Cook , Thomas Lendacky , Sami Tolvanen , Heiko Carstens , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , x86@kernel.org, Yu-cheng Yu Subject: [PATCH] x86: Don't discard .exit.text and .exit.data at link-time Date: Thu, 30 Jan 2020 10:00:48 -0800 Message-Id: <20200130180048.2901-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since .exit.text and .exit.data sections are discarded at runtime, we should undefine EXIT_TEXT and EXIT_DATA to exclude .exit.text and .exit.data sections from default discarded sections. Signed-off-by: H.J. Lu --- arch/x86/kernel/vmlinux.lds.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index d1b942365d27..fb2c45cb1d1f 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -416,6 +416,12 @@ SECTIONS STABS_DEBUG DWARF_DEBUG + /* Sections to be discarded. EXIT_TEXT and EXIT_DATA discard at runtime. + * not link time. */ +#undef EXIT_TEXT +#define EXIT_TEXT +#undef EXIT_DATA +#define EXIT_DATA DISCARDS /DISCARD/ : { *(.eh_frame) -- 2.24.1