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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 CAD51C47257 for ; Fri, 8 May 2020 11:11:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A9931208CA for ; Fri, 8 May 2020 11:11:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iJQOp4Hn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727994AbgEHLLi (ORCPT ); Fri, 8 May 2020 07:11:38 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:31577 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727950AbgEHLLh (ORCPT ); Fri, 8 May 2020 07:11:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588936296; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=EfxAyvFhtEeMjfTkBH/0AHfmW+lD5OuNv7RpEYCIYQY=; b=iJQOp4HnZ4U0Ad7i4aNJPpcR61QYSkH9hPpAT2nMaVWqgv4qlTOxPpS1jmQywItlmVmPe/ 9s7q61qiOfu528/aSOsZZZsFSmPKlqiIoekShTxNua6L+x2ci4Hzicdh5+8I0hXjcgW5Nt BrnxHr8GkRvy59jElQb+hqdbgf+VTrI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-46-NnZ_G2e4M7C-nNo44rdMZg-1; Fri, 08 May 2020 07:11:32 -0400 X-MC-Unique: NnZ_G2e4M7C-nNo44rdMZg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4819680183C; Fri, 8 May 2020 11:11:30 +0000 (UTC) Received: from firesoul.localdomain (unknown [10.40.208.11]) by smtp.corp.redhat.com (Postfix) with ESMTP id AE31C10013BD; Fri, 8 May 2020 11:11:24 +0000 (UTC) Received: from [192.168.42.3] (localhost [IPv6:::1]) by firesoul.localdomain (Postfix) with ESMTP id A46D93063F605; Fri, 8 May 2020 13:11:23 +0200 (CEST) Subject: [PATCH net-next v3 31/33] bpf: add xdp.frame_sz in bpf_prog_test_run_xdp(). From: Jesper Dangaard Brouer To: sameehj@amazon.com Cc: Jesper Dangaard Brouer , netdev@vger.kernel.org, bpf@vger.kernel.org, =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Daniel Borkmann , Alexei Starovoitov , "David S. Miller" , John Fastabend , Alexander Duyck , Jeff Kirsher , David Ahern , Ilias Apalodimas , Lorenzo Bianconi , Saeed Mahameed , Tariq Toukan Date: Fri, 08 May 2020 13:11:23 +0200 Message-ID: <158893628359.2321140.11347376968070548189.stgit@firesoul> In-Reply-To: <158893607924.2321140.16117992313983615627.stgit@firesoul> References: <158893607924.2321140.16117992313983615627.stgit@firesoul> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Update the memory requirements, when adding xdp.frame_sz in BPF test_run function bpf_prog_test_run_xdp() which e.g. is used by XDP selftests. Specifically add the expected reserved tailroom, but also allocated a larger memory area to reflect that XDP frames usually comes in this format. Limit the provided packet data size to 4096 minus headroom + tailroom, as this also reflect a common 3520 bytes MTU limit with XDP. Note that bpf_test_init already use a memory allocation method that clears memory. Thus, this already guards against leaking uninit kernel memory. Signed-off-by: Jesper Dangaard Brouer --- net/bpf/test_run.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index 29dbdd4c29f6..30ba7d38941d 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -470,25 +470,34 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, union bpf_attr __user *uattr) { + u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + u32 headroom = XDP_PACKET_HEADROOM; u32 size = kattr->test.data_size_in; u32 repeat = kattr->test.repeat; struct netdev_rx_queue *rxqueue; struct xdp_buff xdp = {}; u32 retval, duration; + u32 max_data_sz; void *data; int ret; if (kattr->test.ctx_in || kattr->test.ctx_out) return -EINVAL; - data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0); + /* XDP have extra tailroom as (most) drivers use full page */ + max_data_sz = 4096 - headroom - tailroom; + if (size > max_data_sz) + return -EINVAL; + + data = bpf_test_init(kattr, max_data_sz, headroom, tailroom); if (IS_ERR(data)) return PTR_ERR(data); xdp.data_hard_start = data; - xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN; + xdp.data = data + headroom; xdp.data_meta = xdp.data; xdp.data_end = xdp.data + size; + xdp.frame_sz = headroom + max_data_sz + tailroom; rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0); xdp.rxq = &rxqueue->xdp_rxq; @@ -496,8 +505,7 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true); if (ret) goto out; - if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN || - xdp.data_end != xdp.data + size) + if (xdp.data != data + headroom || xdp.data_end != xdp.data + size) size = xdp.data_end - xdp.data; ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration); out: