From patchwork Thu Sep 12 09:17:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 1161474 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 46TYZ20pNZz9s7T for ; Thu, 12 Sep 2019 19:36:41 +1000 (AEST) Received: from localhost ([::1]:59828 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i8LWp-0003wo-1q for incoming@patchwork.ozlabs.org; Thu, 12 Sep 2019 05:36:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42678) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i8LEm-0002J3-Kk for qemu-devel@nongnu.org; Thu, 12 Sep 2019 05:18:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i8LEl-00062Q-6Y for qemu-devel@nongnu.org; Thu, 12 Sep 2019 05:18:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41492) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i8LEi-00060S-U2; Thu, 12 Sep 2019 05:17:57 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4AF163003AFE; Thu, 12 Sep 2019 09:17:56 +0000 (UTC) Received: from maximlenovopc.usersys.redhat.com (unknown [10.35.206.59]) by smtp.corp.redhat.com (Postfix) with ESMTP id 14E1E166A2; Thu, 12 Sep 2019 09:17:53 +0000 (UTC) From: Maxim Levitsky To: qemu-devel@nongnu.org Date: Thu, 12 Sep 2019 12:17:10 +0300 Message-Id: <20190912091710.21449-13-mlevitsk@redhat.com> In-Reply-To: <20190912091710.21449-1-mlevitsk@redhat.com> References: <20190912091710.21449-1-mlevitsk@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Thu, 12 Sep 2019 09:17:56 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 12/12] qcrypto-luks: more rigorous header checking X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , qemu-block@nongnu.org, John Snow , Markus Armbruster , Max Reitz , Maxim Levitsky Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Check that keyslots don't overlap with the data, and check that keyslots don't overlap with each other. (this is done using naive O(n^2) nested loops, but since there are just 8 keyslots, this doesn't really matter. Signed-off-by: Maxim Levitsky Reviewed-by: Daniel P. Berrangé --- crypto/block-luks.c | 52 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/crypto/block-luks.c b/crypto/block-luks.c index 0d155c6614..6c53bdc428 100644 --- a/crypto/block-luks.c +++ b/crypto/block-luks.c @@ -530,6 +530,11 @@ qcrypto_block_luks_load_header(QCryptoBlock *block, static int qcrypto_block_luks_check_header(const QCryptoBlockLUKS *luks, Error **errp) { + size_t i, j; + + unsigned int header_sectors = QCRYPTO_BLOCK_LUKS_KEY_SLOT_OFFSET / + QCRYPTO_BLOCK_LUKS_SECTOR_SIZE; + if (memcmp(luks->header.magic, qcrypto_block_luks_magic, QCRYPTO_BLOCK_LUKS_MAGIC_LEN) != 0) { error_setg(errp, "Volume is not in LUKS format"); @@ -541,6 +546,53 @@ qcrypto_block_luks_check_header(const QCryptoBlockLUKS *luks, Error **errp) luks->header.version); return -1; } + + /* Check all keyslots for corruption */ + for (i = 0 ; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS ; i++) { + + const QCryptoBlockLUKSKeySlot *slot1 = &luks->header.key_slots[i]; + unsigned int start1 = slot1->key_offset_sector; + unsigned int len1 = + qcrypto_block_luks_splitkeylen_sectors(luks, + header_sectors, + slot1->stripes); + + if (slot1->stripes == 0) { + error_setg(errp, "Keyslot %zu is corrupted (stripes == 0)", i); + return -1; + } + + if (slot1->active != QCRYPTO_BLOCK_LUKS_KEY_SLOT_DISABLED && + slot1->active != QCRYPTO_BLOCK_LUKS_KEY_SLOT_ENABLED) { + error_setg(errp, + "Keyslot %zu state (active/disable) is corrupted", i); + return -1; + } + + if (start1 + len1 > luks->header.payload_offset_sector) { + error_setg(errp, + "Keyslot %zu is overlapping with the encrypted payload", + i); + return -1; + } + + for (j = i + 1 ; j < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS ; j++) { + const QCryptoBlockLUKSKeySlot *slot2 = &luks->header.key_slots[j]; + unsigned int start2 = slot2->key_offset_sector; + unsigned int len2 = + qcrypto_block_luks_splitkeylen_sectors(luks, + header_sectors, + slot2->stripes); + + if (start1 + len1 > start2 && start2 + len2 > start1) { + error_setg(errp, + "Keyslots %zu and %zu are overlapping in the header", + i, j); + return -1; + } + } + + } return 0; }