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=ham 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 AA0E6C00143 for ; Tue, 17 Aug 2021 21:07:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 955E560295 for ; Tue, 17 Aug 2021 21:07:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235084AbhHQVIW (ORCPT ); Tue, 17 Aug 2021 17:08:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234904AbhHQVIP (ORCPT ); Tue, 17 Aug 2021 17:08:15 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 643BAC06129E for ; Tue, 17 Aug 2021 14:07:39 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id l11so491890plk.6 for ; Tue, 17 Aug 2021 14:07:39 -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=XUdrMEiMcNwJITolVxGKhK3nS1Hy9iqS2mHu14ZIpSk=; b=iwu7kfCtldNSz3EUqFtWrvTRn7eSOvGqucT5IwVIVdNymd17wz32gq6/Mr35BBRygU CdrMGSoJsLEG6r4KbbfvFkcJCXvlmwyZqsZ8+xSX2QQRDQIPCkJ4cOWIdeExGmKiXnea 44/mcT6FV+svD1q8cyFNSxe2gSqVsTd0ZwujaWdf4zlWHX8JHF4Scdg7lzKIyLknLhfF GG3S5ldwDJmqSqpUniOimC36UW2I2j2mQ0aVgb0UqdNAuvQN7p+Lu51MyMX2nKlaXT3Z IOlAEPCKKKTo015giN/8MKv9yTgXBXw6COvgGJTMiZSIqOrNzWg9lCCuu7TQ+/OgcQ3Y dEPw== 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=XUdrMEiMcNwJITolVxGKhK3nS1Hy9iqS2mHu14ZIpSk=; b=Jb9NzaQNrjGlN+jsKSbyH5JZdarED0vdjAFELvXclOVYKeXjeuzirm0pTFKpP/45cl E5Q6pojJ5bvFT2QON/6U09zg8Q7Sa9pKOG7yxHgrMKomAzagsyoBh5gSC4MHqqBTwD9P mX2FW+GbgZuuJ97S1QNkNQMZxVzqdOS9thdJFK6U1MYexXSeB2gUv0O3oa4l4LqWd8+b jGwfSpXKIKxEvUInaY0txpx7raegMm2508ralJyuP03QDLqaRS6H/sZw9Bj9Ajtk5QXz ApoGpnDmDoPUwHhm8SxRz48mCDG4Lyc2HtXxOGcYa6wWlgYvA88WXO42Nhdv6hWqY/X2 qWjQ== X-Gm-Message-State: AOAM5318VQpQN56RkiFhxleCeMNmr/CoOVibIPndADxp5ZS/OtF5YXDv 8E29n2lMAdMiTroWQWLso5dy7A== X-Google-Smtp-Source: ABdhPJx39RMaveo/0rAjXWN64rt7ssEyuFIeofZv0OsyBsW8ueztIi/55BWnZ8GDKS5BJb6sGi+QWg== X-Received: by 2002:a63:5ec2:: with SMTP id s185mr5223304pgb.221.1629234458948; Tue, 17 Aug 2021 14:07:38 -0700 (PDT) Received: from relinquished.tfbnw.net ([2620:10d:c090:400::5:df70]) by smtp.gmail.com with ESMTPSA id c9sm4205194pgq.58.2021.08.17.14.07.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 14:07:38 -0700 (PDT) From: Omar Sandoval To: linux-btrfs@vger.kernel.org Cc: kernel-team@fb.com, linux-fsdevel@vger.kernel.org, Al Viro , Linus Torvalds , linux-api@vger.kernel.org Subject: [PATCH v10 03/10] btrfs-progs: receive: support v2 send stream DATA tlv format Date: Tue, 17 Aug 2021 14:06:49 -0700 Message-Id: X-Mailer: git-send-email 2.32.0 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; -- 2.32.0