From patchwork Fri Jun 19 14:34:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 224049 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 2CAD4C433E1 for ; Fri, 19 Jun 2020 15:30:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 012622166E for ; Fri, 19 Jun 2020 15:30:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592580629; bh=r6EliizRfhM4+8HlSDWbsKnzlj+GEis6zN/fAjxUXHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NXX2qTn8jRi5ls4rAmeJMiixZxa0HKzisTLwKHXfPjFmejvBX/eSEbDza43Yuz1xu zx22VieIRmAmsUVQMwXACFiJVbktCYi0TZ55R0YT2xZceAGCAuZkDFWLcMkWgrti2M NM+akotyHrCRgPIiLFmGbav45D4TqVzRbET+So54= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393719AbgFSPa2 (ORCPT ); Fri, 19 Jun 2020 11:30:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:34304 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393479AbgFSPa2 (ORCPT ); Fri, 19 Jun 2020 11:30:28 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9513A20757; Fri, 19 Jun 2020 15:30:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592580627; bh=r6EliizRfhM4+8HlSDWbsKnzlj+GEis6zN/fAjxUXHM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NJvT+V7aL39BEY01z8CnXTiY4qCQCZ1Ur2sb88rDpdFd+HX6wY3pTsiJvFst6xlT0 zYMRLdbPrwP/FfooXJAClKCWEzaM/RLFAjAUZFMMl9MMPR1ofW87dGxe7olp7ViLYY 7aFriK4v39MnybTkKor9N7YW39xW40m3CZM1ZblQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, stable@kernel.org, Al Viro Subject: [PATCH 5.7 322/376] sparc64: fix misuses of access_process_vm() in genregs32_[sg]et() Date: Fri, 19 Jun 2020 16:34:00 +0200 Message-Id: <20200619141725.573811905@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141710.350494719@linuxfoundation.org> References: <20200619141710.350494719@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Al Viro commit 142cd25293f6a7ecbdff4fb0af17de6438d46433 upstream. We do need access_process_vm() to access the target's reg_window. However, access to caller's memory (storing the result in genregs32_get(), fetching the new values in case of genregs32_set()) should be done by normal uaccess primitives. Fixes: ad4f95764040 ([SPARC64]: Fix user accesses in regset code.) Cc: stable@kernel.org Signed-off-by: Al Viro Signed-off-by: Greg Kroah-Hartman --- arch/sparc/kernel/ptrace_64.c | 17 +++-------------- 1 file changed, 3 insertions(+), 14 deletions(-) --- a/arch/sparc/kernel/ptrace_64.c +++ b/arch/sparc/kernel/ptrace_64.c @@ -572,19 +572,13 @@ static int genregs32_get(struct task_str for (; count > 0 && pos < 32; count--) { if (access_process_vm(target, (unsigned long) - ®_window[pos], + ®_window[pos++], ®, sizeof(reg), FOLL_FORCE) != sizeof(reg)) return -EFAULT; - if (access_process_vm(target, - (unsigned long) u, - ®, sizeof(reg), - FOLL_FORCE | FOLL_WRITE) - != sizeof(reg)) + if (put_user(reg, u++)) return -EFAULT; - pos++; - u++; } } } @@ -684,12 +678,7 @@ static int genregs32_set(struct task_str } } else { for (; count > 0 && pos < 32; count--) { - if (access_process_vm(target, - (unsigned long) - u, - ®, sizeof(reg), - FOLL_FORCE) - != sizeof(reg)) + if (get_user(reg, u++)) return -EFAULT; if (access_process_vm(target, (unsigned long)