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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 AE846C4320E for ; Wed, 1 Sep 2021 17:01:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9819C61058 for ; Wed, 1 Sep 2021 17:01:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345659AbhIARCx (ORCPT ); Wed, 1 Sep 2021 13:02:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345678AbhIARCv (ORCPT ); Wed, 1 Sep 2021 13:02:51 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57918C061575 for ; Wed, 1 Sep 2021 10:01:54 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id w7so33731pgk.13 for ; Wed, 01 Sep 2021 10:01:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osandov-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=tujutpTW/eYDxTYW9Xs5gVAc9oxl6CR1SbRMe2REgFE=; b=FMBLGVFsHRwFa/Nf7Lt+8RduAnVuSIbSowW9OCDcxs5eks9v2vxpTOZOXLBXe6jPQD /E6Y4aVEnzGL49wgoe4s35gL2nVLDBJ+uWc1nOP2ELb/wwBb900DtLKvHqpR2yGZOEqc xxistL6GmD5Mk1xPsHHZJPDJkRBPN+JiU1QhanOOyl0to9Bl3F6ibpUO2f2mVuwbegQ1 Vg57W4oltKI3Q+iRNwWmpdsbgrX+G/qlxlyLKzc0dkOeuqB6aMgUu0t3234Cz8crmE0e NLbiOPOaN9+Gf9pbaBnFGoNc2OZUjiOsozzUhOeDh/DGDYh7+Xwv4ot/gxGAoH7zx0AG umPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=tujutpTW/eYDxTYW9Xs5gVAc9oxl6CR1SbRMe2REgFE=; b=D/as5WfbH9MOmEGDNj6JPb+9zmQ66vjAlU4P0pKamRmc/yw8d9Ljx/LVpQMhkVaZQv 4HVNRDzS++TiextY4NeiPd+K4d5nr7Z+XzDE4svumQ5gPnejoUGzFz2TLruLLqambVnw i1vbv38vu4CodorDfztadU1nLy8BmOYFpI9Til8rH+4fTXb3rBv6hXGz/Zr0Bny3lKyR 5DCzozqm30uUansTHY7+hlRq6wZ4Wzf771U2rq/TDtxzVePXMucXWjIBzwF7IZHqCQuD 682hwYTI5Uu9tadR0cTarWGGswX4kIkBZvPYbCy/lKhvjSNHU6oyJiEDVqgX7uzeho12 PKJQ== X-Gm-Message-State: AOAM532BkkncAccldOhbqnEUj15A590E9ShyfDWXVcahLDOHemo854j8 cFuX50Et9+lQMBqp3s1ynx3SWg== X-Google-Smtp-Source: ABdhPJxB3un2PWlMW96Xz/EEcsxEwAVU9wtdAtU/7C2gcoui5RhUXSA2ezCTgvO4K6CCYFI3+KcZJA== X-Received: by 2002:a63:111f:: with SMTP id g31mr122664pgl.80.1630515713900; Wed, 01 Sep 2021 10:01:53 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:a2b2]) by smtp.gmail.com with ESMTPSA id y7sm58642pff.206.2021.09.01.10.01.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Sep 2021 10:01:53 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v11 03/10] btrfs-progs: receive: support v2 send stream DATA tlv format Date: Wed, 1 Sep 2021 10:01:12 -0700 Message-Id: <0240e4ddc8c47d6074a3ffeba5933169ce5690f8.1630515568.git.osandov@fb.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org From: Boris Burkov The new format privileges the BTRFS_SEND_A_DATA attribute by guaranteeing it will always be the last attribute in any command that needs it, and by implicitly encoding the data length as the difference between the total command length in the command header and the sizes of the rest of the attributes (and of course the tlv_type identifying the DATA attribute). To parse the new stream, we must read the tlv_type and if it is not DATA, we proceed normally, but if it is DATA, we don't parse a tlv_len but simply compute the length. In addition, we add some bounds checking when parsing each chunk of data, as well as for the tlv_len itself. Signed-off-by: Boris Burkov --- common/send-stream.c | 36 ++++++++++++++++++++++++++---------- 1 file changed, 26 insertions(+), 10 deletions(-) diff --git a/common/send-stream.c b/common/send-stream.c index 3d3585c3..4d819185 100644 --- a/common/send-stream.c +++ b/common/send-stream.c @@ -165,28 +165,44 @@ static int read_cmd(struct btrfs_send_stream *sctx) pos = 0; while (pos < cmd_len) { - struct btrfs_tlv_header *tlv_hdr; u16 tlv_type; - u16 tlv_len; struct btrfs_send_attribute *send_attr; - tlv_hdr = (struct btrfs_tlv_header *)data; - tlv_type = le16_to_cpu(tlv_hdr->tlv_type); - tlv_len = le16_to_cpu(tlv_hdr->tlv_len); + if (cmd_len - pos < sizeof(__le16)) { + error("send stream is truncated"); + ret = -EINVAL; + goto out; + } + tlv_type = le16_to_cpu(*(__le16 *)data); if (tlv_type == 0 || tlv_type > BTRFS_SEND_A_MAX) { - error("invalid tlv in cmd tlv_type = %hu, tlv_len = %hu", - tlv_type, tlv_len); + error("invalid tlv in cmd tlv_type = %hu", tlv_type); ret = -EINVAL; goto out; } send_attr = &sctx->cmd_attrs[tlv_type]; send_attr->tlv_type = tlv_type; - send_attr->tlv_len = tlv_len; - pos += sizeof(*tlv_hdr); - data += sizeof(*tlv_hdr); + pos += sizeof(tlv_type); + data += sizeof(tlv_type); + if (sctx->version == 2 && tlv_type == BTRFS_SEND_A_DATA) { + send_attr->tlv_len = cmd_len - pos; + } else { + if (cmd_len - pos < sizeof(__le16)) { + error("send stream is truncated"); + ret = -EINVAL; + goto out; + } + send_attr->tlv_len = le16_to_cpu(*(__le16 *)data); + pos += sizeof(__le16); + data += sizeof(__le16); + } + if (cmd_len - pos < send_attr->tlv_len) { + error("send stream is truncated"); + ret = -EINVAL; + goto out; + } send_attr->data = data; pos += send_attr->tlv_len; data += send_attr->tlv_len; -- 2.33.0