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=-19.0 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 7187AC433B4 for ; Mon, 12 Apr 2021 16:48:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D7E06023C for ; Mon, 12 Apr 2021 16:48:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345191AbhDLQql (ORCPT ); Mon, 12 Apr 2021 12:46:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:38902 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344017AbhDLQge (ORCPT ); Mon, 12 Apr 2021 12:36:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A8F2D6136F; Mon, 12 Apr 2021 16:27:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618244861; bh=o0maZVGYgCnzP4OfbpZ1TajAz/ChKWpbamAKFME+umo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BRxMHB8EQGgMJGbbz1q47w7AOYE5LHIClkZW4V6qHz/bB55O6OvL0/JmUARcgcPwz TjZQzs91zhwTWloG5scRy6L7oF4JxmA0hYCTiTa4QOcjcdrxkKgYTgcZmSGG46/uwK Jlby5O4yaPv+rp+UBxwXh9M3C5xTjZ594O8fwAR3q9gRwGXW1CqXjWkXQKzx5sXlf0 7srFg+C1ZUKCUKOFHRJ2n9XYsrMEew8hidk82jro0udESydp5IYGXlh8HHBebHthk4 a/oyOkTp99ULQDIpwmzXS+9rZPr+2+UagC/ojnBHHSNzziAKnXMnWwaMyAZHYwj7C0 GW9WSSrFFT0YQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Wang Qing , Vineet Gupta , Sasha Levin , linux-snps-arc@lists.infradead.org Subject: [PATCH AUTOSEL 4.4 03/23] arc: kernel: Return -EFAULT if copy_to_user() fails Date: Mon, 12 Apr 2021 12:27:16 -0400 Message-Id: <20210412162736.316026-3-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210412162736.316026-1-sashal@kernel.org> References: <20210412162736.316026-1-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: Wang Qing [ Upstream commit 46e152186cd89d940b26726fff11eb3f4935b45a ] The copy_to_user() function returns the number of bytes remaining to be copied, but we want to return -EFAULT if the copy doesn't complete. Signed-off-by: Wang Qing Signed-off-by: Vineet Gupta Signed-off-by: Sasha Levin --- arch/arc/kernel/signal.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c index 257b8699efde..639f39f39917 100644 --- a/arch/arc/kernel/signal.c +++ b/arch/arc/kernel/signal.c @@ -97,7 +97,7 @@ stash_usr_regs(struct rt_sigframe __user *sf, struct pt_regs *regs, sizeof(sf->uc.uc_mcontext.regs.scratch)); err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t)); - return err; + return err ? -EFAULT : 0; } static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf) @@ -111,7 +111,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf) &(sf->uc.uc_mcontext.regs.scratch), sizeof(sf->uc.uc_mcontext.regs.scratch)); if (err) - return err; + return -EFAULT; set_current_blocked(&set); regs->bta = uregs.scratch.bta; -- 2.30.2