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 C9B5EC433E1 for ; Tue, 26 May 2020 14:52:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B054D208A9 for ; Tue, 26 May 2020 14:52:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729541AbgEZOw4 (ORCPT ); Tue, 26 May 2020 10:52:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50208 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729368AbgEZOwz (ORCPT ); Tue, 26 May 2020 10:52:55 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53DF2C03E96D; Tue, 26 May 2020 07:52:55 -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 1jdawl-0004PS-Md; Tue, 26 May 2020 16:52:51 +0200 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 032F91C00FA; Tue, 26 May 2020 16:52:51 +0200 (CEST) Date: Tue, 26 May 2020 14:52:50 -0000 From: "tip-bot2 for Andy Lutomirski" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/urgent] x86/syscalls: Revert "x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long" Cc: Thorsten Glaser , Andy Lutomirski , Borislav Petkov , stable@kernel.org, x86 , LKML In-Reply-To: <92e55442b744a5951fdc9cfee10badd0a5f7f828.1588983892.git.luto@kernel.org> References: <92e55442b744a5951fdc9cfee10badd0a5f7f828.1588983892.git.luto@kernel.org> MIME-Version: 1.0 Message-ID: <159050477082.17951.1414743958663563425.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 x86/urgent branch of tip: Commit-ID: 700d3a5a664df267f01ec8887fd2d8ff98f67e7f Gitweb: https://git.kernel.org/tip/700d3a5a664df267f01ec8887fd2d8ff98f67e7f Author: Andy Lutomirski AuthorDate: Fri, 08 May 2020 17:25:32 -07:00 Committer: Borislav Petkov CommitterDate: Tue, 26 May 2020 16:42:43 +02:00 x86/syscalls: Revert "x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long" Revert 45e29d119e99 ("x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long") and add a comment to discourage someone else from making the same mistake again. It turns out that some user code fails to compile if __X32_SYSCALL_BIT is unsigned long. See, for example [1] below. [ bp: Massage and do the same thing in the respective tools/ header. ] Fixes: 45e29d119e99 ("x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long") Reported-by: Thorsten Glaser Signed-off-by: Andy Lutomirski Signed-off-by: Borislav Petkov Cc: stable@kernel.org Link: [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954294 Link: https://lkml.kernel.org/r/92e55442b744a5951fdc9cfee10badd0a5f7f828.1588983892.git.luto@kernel.org --- arch/x86/include/uapi/asm/unistd.h | 11 +++++++++-- tools/arch/x86/include/uapi/asm/unistd.h | 2 +- 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/uapi/asm/unistd.h b/arch/x86/include/uapi/asm/unistd.h index 196fdd0..be5e2e7 100644 --- a/arch/x86/include/uapi/asm/unistd.h +++ b/arch/x86/include/uapi/asm/unistd.h @@ -2,8 +2,15 @@ #ifndef _UAPI_ASM_X86_UNISTD_H #define _UAPI_ASM_X86_UNISTD_H -/* x32 syscall flag bit */ -#define __X32_SYSCALL_BIT 0x40000000UL +/* + * x32 syscall flag bit. Some user programs expect syscall NR macros + * and __X32_SYSCALL_BIT to have type int, even though syscall numbers + * are, for practical purposes, unsigned long. + * + * Fortunately, expressions like (nr & ~__X32_SYSCALL_BIT) do the right + * thing regardless. + */ +#define __X32_SYSCALL_BIT 0x40000000 #ifndef __KERNEL__ # ifdef __i386__ diff --git a/tools/arch/x86/include/uapi/asm/unistd.h b/tools/arch/x86/include/uapi/asm/unistd.h index 196fdd0..30d7d04 100644 --- a/tools/arch/x86/include/uapi/asm/unistd.h +++ b/tools/arch/x86/include/uapi/asm/unistd.h @@ -3,7 +3,7 @@ #define _UAPI_ASM_X86_UNISTD_H /* x32 syscall flag bit */ -#define __X32_SYSCALL_BIT 0x40000000UL +#define __X32_SYSCALL_BIT 0x40000000 #ifndef __KERNEL__ # ifdef __i386__