From patchwork Mon Apr 26 07:29:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 427860 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,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 03532C433ED for ; Mon, 26 Apr 2021 07:39:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5717613C0 for ; Mon, 26 Apr 2021 07:39:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232492AbhDZHkh (ORCPT ); Mon, 26 Apr 2021 03:40:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:50350 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233239AbhDZHjS (ORCPT ); Mon, 26 Apr 2021 03:39:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DF36C613BC; Mon, 26 Apr 2021 07:36:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1619422614; bh=wQmhuzaCHK+pZWUvY/gW8zm0lQr9CrxBVVbOKseXz0M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T2Ze4awZITVP1z3kMJAUlOb4C6UQMMsDriPM2ry5GNFmmbq2TfIXBbNi6ogR4OIlR n8N9sx9qYfDceXRl6Ma2YWgGIjhc3oWPGBL1g9C0iGrqI4gTk8aHESYEwRPUeoKpd9 loS1T6uD3UiF5lSOp0e0Yl0NYoqUKJfJ1ovRiXUI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wang Qing , Vineet Gupta , Sasha Levin Subject: [PATCH 4.19 08/57] arc: kernel: Return -EFAULT if copy_to_user() fails Date: Mon, 26 Apr 2021 09:29:05 +0200 Message-Id: <20210426072820.850595582@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210426072820.568997499@linuxfoundation.org> References: <20210426072820.568997499@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@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 48685445002e..da243420bcb5 100644 --- a/arch/arc/kernel/signal.c +++ b/arch/arc/kernel/signal.c @@ -99,7 +99,7 @@ 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) @@ -113,7 +113,7 @@ 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;