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=-13.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 0A1ACC43460 for ; Sat, 1 May 2021 08:20:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C92E0610E9 for ; Sat, 1 May 2021 08:20:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231473AbhEAIQp (ORCPT ); Sat, 1 May 2021 04:16:45 -0400 Received: from pegase2.c-s.fr ([93.17.235.10]:60605 "EHLO pegase2.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229510AbhEAIQo (ORCPT ); Sat, 1 May 2021 04:16:44 -0400 Received: from localhost (mailhub3.si.c-s.fr [172.26.127.67]) by localhost (Postfix) with ESMTP id 4FXMWC5W4fz9sRs; Sat, 1 May 2021 10:15:51 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase2.c-s.fr ([172.26.127.65]) by localhost (pegase2.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fg9IUuAJTwT6; Sat, 1 May 2021 10:15:51 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase2.c-s.fr (Postfix) with ESMTP id 4FXMWC4ZYsz9sRq; Sat, 1 May 2021 10:15:51 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 6D55F8B76F; Sat, 1 May 2021 10:15:51 +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 y1IqsAiUoALE; Sat, 1 May 2021 10:15:51 +0200 (CEST) Received: from po15610vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 25D8D8B763; Sat, 1 May 2021 10:15:51 +0200 (CEST) Received: by po15610vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 04197642A5; Sat, 1 May 2021 08:15:50 +0000 (UTC) Message-Id: <1acb97f184bf08078ebe0ba8a20b41937949a5a8.1619856556.git.christophe.leroy@csgroup.eu> In-Reply-To: References: From: Christophe Leroy Subject: [PATCH RESEND] drm/i915/gem: Use user_write_access_begin() instead of user_access_begin() To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Andrew Morton Cc: linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org Date: Sat, 1 May 2021 08:15:51 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org eb_copy_relocations() only do unsafe_put_user(), it only requires write access to user. Use user_write_access_begin() instead of user_access_begin(). Signed-off-by: Christophe Leroy --- Resending with mm list in addition drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 5964e67c7d36..f7a7bb45274b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -1907,14 +1907,14 @@ static int eb_copy_relocations(const struct i915_execbuffer *eb) * happened we would make the mistake of assuming that the * relocations were valid. */ - if (!user_access_begin(urelocs, size)) + if (!user_write_access_begin(urelocs, size)) goto end; for (copied = 0; copied < nreloc; copied++) unsafe_put_user(-1, &urelocs[copied].presumed_offset, end_user); - user_access_end(); + user_write_access_end(); eb->exec[i].relocs_ptr = (uintptr_t)relocs; } @@ -1922,7 +1922,7 @@ static int eb_copy_relocations(const struct i915_execbuffer *eb) return 0; end_user: - user_access_end(); + user_write_access_end(); end: kvfree(relocs); err = -EFAULT; -- 2.25.0