From nobody Sun Feb 8 00:49:27 2026 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 549E5C7EE24 for ; Fri, 2 Jun 2023 08:59:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234152AbjFBI7l (ORCPT ); Fri, 2 Jun 2023 04:59:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234688AbjFBI7V (ORCPT ); Fri, 2 Jun 2023 04:59:21 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6784CE53; Fri, 2 Jun 2023 01:59:16 -0700 (PDT) Date: Fri, 02 Jun 2023 08:59:12 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1685696353; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OzCUvK7VsvtUi6pVkojjKFhV5bxfWD/ubOOML8CJHr4=; b=nmU+nyLIeV3A0zgTlk5bmIsY6xNG4Cp7DSrEiAJzF+d5LsWEU1m4bNAHY+xiWEELFeuF9Q hlWxBaxYPFIWik0mN83Jxo6UIJTVO7ghYBx6wqL4OnT1jUp0hQjfVfh6/eBiBjdjkcEQ2h nxGCkMGJmVUETeaGcJRxJ3kV+liPzkG4dFKaH1gJXmKwxAwttEkjzyE0MtInNdxnux/keU /pqb0qjpEyBuJsjmJAyIYTrG/wqGvVydMRNU2sV0SuUoFhQx6XjscO+rXFE4ePtmzQ4Q5l EgcpxN6qT22I5yM+MJsSszW6ehbLT1HdMiM3QGD8bm36tPnCEMJqQtNdu2iZGw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1685696353; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OzCUvK7VsvtUi6pVkojjKFhV5bxfWD/ubOOML8CJHr4=; b=q5wsCAq8APdqKOSiDdVKBlFJtH53WukIq3p6z/zS6XrmGLI2h9s8tOfiXy7BTnH6SwxugB zepCg+MxMOo2q0Ag== From: "tip-bot2 for Nadav Amit" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/misc] x86/lib: Make get/put_user() exception handling a visible symbol Cc: Nadav Amit , "Borislav Petkov (AMD)" , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20230525184244.2311-1-namit@vmware.com> References: <20230525184244.2311-1-namit@vmware.com> MIME-Version: 1.0 Message-ID: <168569635294.404.854143587019790184.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/misc branch of tip: Commit-ID: 5516c89d58283413134f8d26960c6303d5d5bd89 Gitweb: https://git.kernel.org/tip/5516c89d58283413134f8d26960c6303d= 5d5bd89 Author: Nadav Amit AuthorDate: Thu, 25 May 2023 11:42:44 -07:00 Committer: Borislav Petkov (AMD) CommitterDate: Fri, 02 Jun 2023 10:51:46 +02:00 x86/lib: Make get/put_user() exception handling a visible symbol The .L-prefixed exception handling symbols of get_user() and put_user() do get discarded from the symbol table of the final kernel image. This confuses tools which parse that symbol table and try to map the chunk of code to a symbol. And, in general, from toolchain perspective, it is a good practice to have all code belong to a symbol, and the correct one at that. ( Currently, objdump displays that exception handling chunk as part of the previous symbol which is a "fallback" of sorts and not correct. ) While at it, rename them to something more descriptive. [ bp: Rewrite commit message, rename symbols. ] Signed-off-by: Nadav Amit Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20230525184244.2311-1-namit@vmware.com --- arch/x86/lib/getuser.S | 32 ++++++++++++++++---------------- arch/x86/lib/putuser.S | 24 ++++++++++++------------ 2 files changed, 28 insertions(+), 28 deletions(-) diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S index b64a2bd..9c63713 100644 --- a/arch/x86/lib/getuser.S +++ b/arch/x86/lib/getuser.S @@ -143,43 +143,43 @@ SYM_FUNC_END(__get_user_nocheck_8) EXPORT_SYMBOL(__get_user_nocheck_8) =20 =20 -SYM_CODE_START_LOCAL(.Lbad_get_user_clac) +SYM_CODE_START_LOCAL(__get_user_handle_exception) ASM_CLAC .Lbad_get_user: xor %edx,%edx mov $(-EFAULT),%_ASM_AX RET -SYM_CODE_END(.Lbad_get_user_clac) +SYM_CODE_END(__get_user_handle_exception) =20 #ifdef CONFIG_X86_32 -SYM_CODE_START_LOCAL(.Lbad_get_user_8_clac) +SYM_CODE_START_LOCAL(__get_user_8_handle_exception) ASM_CLAC bad_get_user_8: xor %edx,%edx xor %ecx,%ecx mov $(-EFAULT),%_ASM_AX RET -SYM_CODE_END(.Lbad_get_user_8_clac) +SYM_CODE_END(__get_user_8_handle_exception) #endif =20 /* get_user */ - _ASM_EXTABLE(1b, .Lbad_get_user_clac) - _ASM_EXTABLE(2b, .Lbad_get_user_clac) - _ASM_EXTABLE(3b, .Lbad_get_user_clac) + _ASM_EXTABLE(1b, __get_user_handle_exception) + _ASM_EXTABLE(2b, __get_user_handle_exception) + _ASM_EXTABLE(3b, __get_user_handle_exception) #ifdef CONFIG_X86_64 - _ASM_EXTABLE(4b, .Lbad_get_user_clac) + _ASM_EXTABLE(4b, __get_user_handle_exception) #else - _ASM_EXTABLE(4b, .Lbad_get_user_8_clac) - _ASM_EXTABLE(5b, .Lbad_get_user_8_clac) + _ASM_EXTABLE(4b, __get_user_8_handle_exception) + _ASM_EXTABLE(5b, __get_user_8_handle_exception) #endif =20 /* __get_user */ - _ASM_EXTABLE(6b, .Lbad_get_user_clac) - _ASM_EXTABLE(7b, .Lbad_get_user_clac) - _ASM_EXTABLE(8b, .Lbad_get_user_clac) + _ASM_EXTABLE(6b, __get_user_handle_exception) + _ASM_EXTABLE(7b, __get_user_handle_exception) + _ASM_EXTABLE(8b, __get_user_handle_exception) #ifdef CONFIG_X86_64 - _ASM_EXTABLE(9b, .Lbad_get_user_clac) + _ASM_EXTABLE(9b, __get_user_handle_exception) #else - _ASM_EXTABLE(9b, .Lbad_get_user_8_clac) - _ASM_EXTABLE(10b, .Lbad_get_user_8_clac) + _ASM_EXTABLE(9b, __get_user_8_handle_exception) + _ASM_EXTABLE(10b, __get_user_8_handle_exception) #endif diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S index 3062d09..1451e0c 100644 --- a/arch/x86/lib/putuser.S +++ b/arch/x86/lib/putuser.S @@ -131,22 +131,22 @@ SYM_FUNC_START(__put_user_nocheck_8) SYM_FUNC_END(__put_user_nocheck_8) EXPORT_SYMBOL(__put_user_nocheck_8) =20 -SYM_CODE_START_LOCAL(.Lbad_put_user_clac) +SYM_CODE_START_LOCAL(__put_user_handle_exception) ASM_CLAC .Lbad_put_user: movl $-EFAULT,%ecx RET -SYM_CODE_END(.Lbad_put_user_clac) +SYM_CODE_END(__put_user_handle_exception) =20 - _ASM_EXTABLE(1b, .Lbad_put_user_clac) - _ASM_EXTABLE(2b, .Lbad_put_user_clac) - _ASM_EXTABLE(3b, .Lbad_put_user_clac) - _ASM_EXTABLE(4b, .Lbad_put_user_clac) - _ASM_EXTABLE(5b, .Lbad_put_user_clac) - _ASM_EXTABLE(6b, .Lbad_put_user_clac) - _ASM_EXTABLE(7b, .Lbad_put_user_clac) - _ASM_EXTABLE(9b, .Lbad_put_user_clac) + _ASM_EXTABLE(1b, __put_user_handle_exception) + _ASM_EXTABLE(2b, __put_user_handle_exception) + _ASM_EXTABLE(3b, __put_user_handle_exception) + _ASM_EXTABLE(4b, __put_user_handle_exception) + _ASM_EXTABLE(5b, __put_user_handle_exception) + _ASM_EXTABLE(6b, __put_user_handle_exception) + _ASM_EXTABLE(7b, __put_user_handle_exception) + _ASM_EXTABLE(9b, __put_user_handle_exception) #ifdef CONFIG_X86_32 - _ASM_EXTABLE(8b, .Lbad_put_user_clac) - _ASM_EXTABLE(10b, .Lbad_put_user_clac) + _ASM_EXTABLE(8b, __put_user_handle_exception) + _ASM_EXTABLE(10b, __put_user_handle_exception) #endif