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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 D5C8CC4332D for ; Wed, 17 Mar 2021 01:06:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE0BA64F9C for ; Wed, 17 Mar 2021 01:06:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233080AbhCQBGK (ORCPT ); Tue, 16 Mar 2021 21:06:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:42812 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232529AbhCQBA1 (ORCPT ); Tue, 16 Mar 2021 21:00:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3138F64FAE; Wed, 17 Mar 2021 01:00:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615942826; bh=6doY695fcNFJgCQPeD37/bzJKzw8f4iXkCzcMtRpyCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pUW8iNdQQprZxLv6eehnBrnQVrFmRjwL5R41q7BIZAGRbcaLAcGA2r1C623/jAS7p pUjVgwjUHhq0+GFBkkgjxliMhaLZqwWe4SngO+VeSSWdnDErXQKNc0hrQTLselolFu sEgN/GteRZ90gcXKOWTWUXtB9BKmn9ZMQBifR8dn5cIrKxv6grVFhjhNNmncEnquDa 2hjqPfoEC/mA2QPUYFKFz8wJdwdy3CHZgFvDk8XoJw6Kql8k3gD96W678rw44s7cFq K2GYHFnjcD39g4pup4kZoPEQXftqLVnZbxOEj6tXnnT6CvfptmIkhjCvcUTwX94J1S ea6nRmlsnd04w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sergei Trofimovich , "Dmitry V . Levin" , John Paul Adrian Glaubitz , Oleg Nesterov , Andrew Morton , Linus Torvalds , Sasha Levin , linux-ia64@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 14/14] ia64: fix ptrace(PTRACE_SYSCALL_INFO_EXIT) sign Date: Tue, 16 Mar 2021 21:00:08 -0400 Message-Id: <20210317010008.727496-14-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210317010008.727496-1-sashal@kernel.org> References: <20210317010008.727496-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sergei Trofimovich [ Upstream commit 61bf318eac2c13356f7bd1c6a05421ef504ccc8a ] In https://bugs.gentoo.org/769614 Dmitry noticed that `ptrace(PTRACE_GET_SYSCALL_INFO)` does not return error sign properly. The bug is in mismatch between get/set errors: static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { return regs->r10 == -1 ? regs->r8:0; } static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { return regs->r8; } static inline void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, int error, long val) { if (error) { /* error < 0, but ia64 uses > 0 return value */ regs->r8 = -error; regs->r10 = -1; } else { regs->r8 = val; regs->r10 = 0; } } Tested on v5.10 on rx3600 machine (ia64 9040 CPU). Link: https://lkml.kernel.org/r/20210221002554.333076-2-slyfox@gentoo.org Link: https://bugs.gentoo.org/769614 Signed-off-by: Sergei Trofimovich Reported-by: Dmitry V. Levin Reviewed-by: Dmitry V. Levin Cc: John Paul Adrian Glaubitz Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- arch/ia64/include/asm/syscall.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/ia64/include/asm/syscall.h b/arch/ia64/include/asm/syscall.h index 1d0b875fec44..ec909eec0b4c 100644 --- a/arch/ia64/include/asm/syscall.h +++ b/arch/ia64/include/asm/syscall.h @@ -35,7 +35,7 @@ static inline void syscall_rollback(struct task_struct *task, static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { - return regs->r10 == -1 ? regs->r8:0; + return regs->r10 == -1 ? -regs->r8:0; } static inline long syscall_get_return_value(struct task_struct *task, -- 2.30.1