From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C4BA320F; Tue, 14 May 2024 11:41:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715686900; cv=none; b=g5FnceZn9xZ7vfqmOLhCVpAAkfm3y5eNWtFxpXE2RmY6aI8MQAPHak3JsOBLIBcy+uIffX89iLouhKOFaEkza5hQsZPPlTT6MBfXL47tiCU/4JjGX9ud8eeewlvfG75FpIca5bQq2VnTwOrLO06Hg3qfMl/FWc71NQJYTNvfrxU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715686900; c=relaxed/simple; bh=Np97OD7t8dwwyjh4ggOlwIA1o9feDlUGEyD0ru9+0hI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q/KdpXdmxGpTg3hzzhu5P9Qn7+olFtQrTZC/rDT+6AUyN76JIQ34VBvhY30He2rL01QS+JlF6sPhOjYJvrkJVwwHsH5pcSQC/+tfDL8hK0DYr+dIUgO583QSQIxUBtkF3EcKetiKVpw79r30Y9lchVy2NRu+bfL10z4eoMD7ETA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PwlENW0q; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="PwlENW0q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD1B7C2BD10; Tue, 14 May 2024 11:41:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1715686900; bh=Np97OD7t8dwwyjh4ggOlwIA1o9feDlUGEyD0ru9+0hI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PwlENW0q7O9HBsoUUEMiF/ha+lh9synxdorDPRvdcHfK02NyjVmAroegBCEOmgjeC bqdBJ00h+Qm68RV/pYxUkPYBzdFuiVa3OT2ETjpS9iSimfn3yU0XIPj2zAI4rocJfB IyPoPoh3wmscGCD1vtSHhPS/lbLVJg9VJ3PV8RGU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zack Rusin , David Airlie , Daniel Vetter , Broadcom internal kernel review list , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Maaz Mombasawala , Martin Krastev , zdi-disclosures@trendmicro.com Subject: [PATCH 4.19 61/63] drm/vmwgfx: Fix invalid reads in fence signaled events Date: Tue, 14 May 2024 12:20:22 +0200 Message-ID: <20240514100950.312271935@linuxfoundation.org> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240514100948.010148088@linuxfoundation.org> References: <20240514100948.010148088@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zack Rusin commit a37ef7613c00f2d72c8fc08bd83fb6cc76926c8c upstream. Correctly set the length of the drm_event to the size of the structure that's actually used. The length of the drm_event was set to the parent structure instead of to the drm_vmw_event_fence which is supposed to be read. drm_read uses the length parameter to copy the event to the user space thus resuling in oob reads. Signed-off-by: Zack Rusin Fixes: 8b7de6aa8468 ("vmwgfx: Rework fence event action") Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-23566 Cc: David Airlie CC: Daniel Vetter Cc: Zack Rusin Cc: Broadcom internal kernel review list Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org Cc: # v3.4+ Reviewed-by: Maaz Mombasawala Reviewed-by: Martin Krastev Link: https://patchwork.freedesktop.org/patch/msgid/20240425192748.1761522-1-zack.rusin@broadcom.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c @@ -1064,7 +1064,7 @@ static int vmw_event_fence_action_create } event->event.base.type = DRM_VMW_EVENT_FENCE_SIGNALED; - event->event.base.length = sizeof(*event); + event->event.base.length = sizeof(event->event); event->event.user_data = user_data; ret = drm_event_reserve_init(dev, file_priv, &event->base, &event->event.base);