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=-19.7 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,URIBL_BLOCKED,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 C4321C4338F for ; Tue, 24 Aug 2021 00:59:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE56D6124B for ; Tue, 24 Aug 2021 00:59:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233595AbhHXA7w (ORCPT ); Mon, 23 Aug 2021 20:59:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:48174 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234597AbhHXA4A (ORCPT ); Mon, 23 Aug 2021 20:56:00 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EDF8B615E1; Tue, 24 Aug 2021 00:55:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629766507; bh=thmN39DdoxQpsvAKeQo/Rb4xDIfOQHTjYfOikOUmUL4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c4yLHgGZjyBBnTufhIybevzmSO+NYtcfJOAzLa5e9XaS723UUnIbpNR4cHnRxqXmi fjPM1F8XlJ1vShZU7HCxARQBXF7GiCanjfJ8cWMqbdDB262Vt5zIcwvmp3cLnlu7B7 3nV/xumqwLTbHdy5to8oFKDnwaSNWqVWN2WuBdLRMDT5KBGZCyqKw0eEJ30hz45Q10 Bi8wHdJx2RH8nfgRfg11zH14TOclkxFcSneKocdRXGZ/yTTwQGplhE1kRpk0gzf6Kl SP3cZFnKWMdA0+gc55+AmTl3NgGexnrrnJ+kD0gX47sf57wk2HaNFy6aibDuS5il7F +KKCnLlH7ldEQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mark Yacoub , =?UTF-8?q?Michel=20D=C3=A4nzer?= , Mark Yacoub , Sean Paul , Sasha Levin , dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.4 07/10] drm: Copy drm_wait_vblank to user before returning Date: Mon, 23 Aug 2021 20:54:54 -0400 Message-Id: <20210824005458.631377-7-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210824005458.631377-1-sashal@kernel.org> References: <20210824005458.631377-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Yacoub [ Upstream commit fa0b1ef5f7a694f48e00804a391245f3471aa155 ] [Why] Userspace should get back a copy of drm_wait_vblank that's been modified even when drm_wait_vblank_ioctl returns a failure. Rationale: drm_wait_vblank_ioctl modifies the request and expects the user to read it back. When the type is RELATIVE, it modifies it to ABSOLUTE and updates the sequence to become current_vblank_count + sequence (which was RELATIVE), but now it became ABSOLUTE. drmWaitVBlank (in libdrm) expects this to be the case as it modifies the request to be Absolute so it expects the sequence to would have been updated. The change is in compat_drm_wait_vblank, which is called by drm_compat_ioctl. This change of copying the data back regardless of the return number makes it en par with drm_ioctl, which always copies the data before returning. [How] Return from the function after everything has been copied to user. Fixes IGT:kms_flip::modeset-vs-vblank-race-interruptible Tested on ChromeOS Trogdor(msm) Reviewed-by: Michel Dänzer Signed-off-by: Mark Yacoub Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20210812194917.1703356-1-markyacoub@chromium.org Signed-off-by: Sasha Levin --- drivers/gpu/drm/drm_ioc32.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c index 2cf053fb8d54..1c691bdb8914 100644 --- a/drivers/gpu/drm/drm_ioc32.c +++ b/drivers/gpu/drm/drm_ioc32.c @@ -863,8 +863,6 @@ static int compat_drm_wait_vblank(struct file *file, unsigned int cmd, req.request.sequence = req32.request.sequence; req.request.signal = req32.request.signal; err = drm_ioctl_kernel(file, drm_wait_vblank_ioctl, &req, DRM_UNLOCKED); - if (err) - return err; req32.reply.type = req.reply.type; req32.reply.sequence = req.reply.sequence; @@ -873,7 +871,7 @@ static int compat_drm_wait_vblank(struct file *file, unsigned int cmd, if (copy_to_user(argp, &req32, sizeof(req32))) return -EFAULT; - return 0; + return err; } #if defined(CONFIG_X86) -- 2.30.2