Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753041AbdGYPvU (ORCPT ); Tue, 25 Jul 2017 11:51:20 -0400 Received: from lhrrgout.huawei.com ([194.213.3.17]:32207 "EHLO lhrrgout.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752678AbdGYPvR (ORCPT ); Tue, 25 Jul 2017 11:51:17 -0400 From: Roberto Sassu To: CC: , , , , Roberto Sassu Subject: [PATCH 07/12] ima: added parser for compact digest list Date: Tue, 25 Jul 2017 17:44:18 +0200 Message-ID: <20170725154423.24845-8-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170725154423.24845-1-roberto.sassu@huawei.com> References: <20170725154423.24845-1-roberto.sassu@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.204.65.245] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.597768F3.0203,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: ff628a91e26500931832dbf7aa29078e Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2676 Lines: 100 This patch introduces the parser for the compact digest list. Its format is: entry_id[2] count[4] data_len[4] data[data_len] entry_id[2] count[4] data_len[4] data[data_len] ... The parser supports the COMPACT_LIST_ID_DIGEST entry ID. This format is suitable to store a large number of digests, as there is no metadata provided for each. Digests (which have all the same size) are concatenated together and placed after the header. Signed-off-by: Roberto Sassu --- security/integrity/ima/ima_digest_list.c | 60 ++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/security/integrity/ima/ima_digest_list.c b/security/integrity/ima/ima_digest_list.c index 3e1ff69b..c1ef79a 100644 --- a/security/integrity/ima/ima_digest_list.c +++ b/security/integrity/ima/ima_digest_list.c @@ -23,6 +23,63 @@ enum digest_metadata_fields {DATA_ALGO, DATA_DIGEST, DATA_SIGNATURE, DATA_FILE_PATH, DATA_REF_ID, DATA_TYPE, DATA__LAST}; +enum digest_data_types {DATA_TYPE_COMPACT_LIST}; + +enum compact_list_entry_ids {COMPACT_LIST_ID_DIGEST}; + +struct compact_list_hdr { + u16 entry_id; + u32 count; + u32 datalen; +} __packed; + +static int ima_parse_compact_list(loff_t size, void *buf) +{ + void *bufp = buf, *bufendp = buf + size; + int digest_len = hash_digest_size[ima_hash_algo]; + struct compact_list_hdr *hdr; + int ret, i; + + while (bufp < bufendp) { + if (bufp + sizeof(*hdr) > bufendp) { + pr_err("compact list, missing header\n"); + return -EINVAL; + } + + hdr = bufp; + + if (ima_canonical_fmt) { + hdr->entry_id = le16_to_cpu(hdr->entry_id); + hdr->count = le32_to_cpu(hdr->count); + hdr->datalen = le32_to_cpu(hdr->datalen); + } + + if (hdr->entry_id != COMPACT_LIST_ID_DIGEST) { + pr_err("compact list, invalid data type\n"); + return -EINVAL; + } + + bufp += sizeof(*hdr); + + for (i = 0; i < hdr->count && + bufp + digest_len <= bufendp; i++) { + ret = ima_add_digest_data_entry(bufp); + if (ret < 0 && ret != -EEXIST) + return ret; + + bufp += digest_len; + } + + if (i != hdr->count || + bufp != (void *)hdr + sizeof(*hdr) + hdr->datalen) { + pr_err("compact list, invalid data\n"); + return -EINVAL; + } + } + + return 0; +} + static int ima_parse_digest_list_data(struct ima_field_data *data) { void *digest_list; @@ -47,6 +104,9 @@ static int ima_parse_digest_list_data(struct ima_field_data *data) } switch (data_type) { + case DATA_TYPE_COMPACT_LIST: + ret = ima_parse_compact_list(digest_list_size, digest_list); + break; default: pr_err("Parser for data type %d not implemented\n", data_type); ret = -EINVAL; -- 2.9.3