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=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 A4CF1C2BA15 for ; Fri, 3 Apr 2020 07:20:59 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 69637206F8 for ; Fri, 3 Apr 2020 07:20:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="l+jIG9oq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69637206F8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 5BD4C8E0007; Fri, 3 Apr 2020 03:20:56 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4F4A68E000A; Fri, 3 Apr 2020 03:20:56 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 322E38E0007; Fri, 3 Apr 2020 03:20:56 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0042.hostedemail.com [216.40.44.42]) by kanga.kvack.org (Postfix) with ESMTP id E04C08E000A for ; Fri, 3 Apr 2020 03:20:55 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id A6434180ACF7F for ; Fri, 3 Apr 2020 07:20:55 +0000 (UTC) X-FDA: 76665696870.25.glass43_423e64c34b026 X-HE-Tag: glass43_423e64c34b026 X-Filterd-Recvd-Size: 4306 Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Fri, 3 Apr 2020 07:20:55 +0000 (UTC) Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 48trv835QJz9txjs; Fri, 3 Apr 2020 09:20:52 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=l+jIG9oq; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id 5wS7b9_ulMkO; Fri, 3 Apr 2020 09:20:52 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 48trv76VHtz9tx3s; Fri, 3 Apr 2020 09:20:51 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1585898451; bh=JLC61II4uokq7KTS7RbQPm5FmSCvhQoLsRB6ODnrrTE=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=l+jIG9oqKo2ergcSx0CB8uXGPebP+BmjHsdA7/k6ncJ7MMqDM8VTh6/Ei43GdKGg6 0kkdwyKbrJsABxMmCyQnlOw9Ppctg+EHBuoB6tkVOeed8KWUVT2pDbKHin38WR0Ysd hWXarkP7dxLG87ECVbBuwSltitJCKlO3jfnUCaD0= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id C08268B943; Fri, 3 Apr 2020 09:20:52 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id LLPqqNnKx87z; Fri, 3 Apr 2020 09:20:52 +0200 (CEST) Received: from pc16570vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 6839F8B75B; Fri, 3 Apr 2020 09:20:52 +0200 (CEST) Received: by pc16570vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 3E8E465700; Fri, 3 Apr 2020 07:20:52 +0000 (UTC) Message-Id: In-Reply-To: <36e43241c7f043a24b5069e78c6a7edd11043be5.1585898438.git.christophe.leroy@c-s.fr> References: <36e43241c7f043a24b5069e78c6a7edd11043be5.1585898438.git.christophe.leroy@c-s.fr> From: Christophe Leroy Subject: [PATCH v2 3/5] drm/i915/gem: Replace user_access_begin by user_write_access_begin To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , airlied@linux.ie, daniel@ffwll.ch, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, keescook@chromium.org, hpa@zytor.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, intel-gfx@lists.freedesktop.org Date: Fri, 3 Apr 2020 07:20:52 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When i915_gem_execbuffer2_ioctl() is using user_access_begin(), that's only to perform unsafe_put_user() so use user_write_access_begin() in order to only open write access. Signed-off-by: Christophe Leroy Reviewed-by: Kees Cook --- v2: Rebased (one part of the patch flies away) --- drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 36d069504836..b4c903308590 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -2794,7 +2794,8 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data, * And this range already got effectively checked earlier * when we did the "copy_from_user()" above. */ - if (!user_access_begin(user_exec_list, count * sizeof(*user_exec_list))) + if (!user_write_access_begin(user_exec_list, + count * sizeof(*user_exec_list))) goto end; for (i = 0; i < args->buffer_count; i++) { @@ -2808,7 +2809,7 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data, end_user); } end_user: - user_access_end(); + user_write_access_end(); end:; } -- 2.25.0