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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 5C91AC2BB55 for ; Thu, 16 Apr 2020 14:10:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 253632076D for ; Thu, 16 Apr 2020 14:10:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587046247; bh=ESA2Q8qNEyYMT9qiYnzTb8YCAnx8roVpY6pxsaqV8pw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=k5WG0clF+UlyX0LFjml3h1OYmgOdZDVkOHgbAEbXMW/c0FyTYZD2lv2L7DGdUO5k+ JjS0FSmzfy7Y1YJUQcd8BowSIC62oqy1nBRlrNETzeNnVcpCAm8qLHcyErJeKMSg87 s1sWjh96W3jOfg+JYM36ufN6Zhgyk8+UW86XsxKY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393376AbgDPOKp (ORCPT ); Thu, 16 Apr 2020 10:10:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:60886 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2898623AbgDPNqp (ORCPT ); Thu, 16 Apr 2020 09:46:45 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9D9AF2076D; Thu, 16 Apr 2020 13:46:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044804; bh=ESA2Q8qNEyYMT9qiYnzTb8YCAnx8roVpY6pxsaqV8pw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j4qdNtmKwgw2qo4P7RxvBOlcj2dRdkRFLpeT6nr/pRuls/RTb9xAtTj65GRBF3wpj q0ADhnSIFn0JCjlSSAwxs5UEeILYkJBndm15OIIWvhjrDCX+LC5A1HGYN04861H6bj ItXO+Bes25i/bpfD5fhbc9xSIga0beSptJArWFK0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Biggers , Yang Xu , Jarkko Sakkinen Subject: [PATCH 5.4 108/232] KEYS: reaching the keys quotas correctly Date: Thu, 16 Apr 2020 15:23:22 +0200 Message-Id: <20200416131328.658431947@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131316.640996080@linuxfoundation.org> References: <20200416131316.640996080@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yang Xu commit 2e356101e72ab1361821b3af024d64877d9a798d upstream. Currently, when we add a new user key, the calltrace as below: add_key() key_create_or_update() key_alloc() __key_instantiate_and_link generic_key_instantiate key_payload_reserve ...... Since commit a08bf91ce28e ("KEYS: allow reaching the keys quotas exactly"), we can reach max bytes/keys in key_alloc, but we forget to remove this limit when we reserver space for payload in key_payload_reserve. So we can only reach max keys but not max bytes when having delta between plen and type->def_datalen. Remove this limit when instantiating the key, so we can keep consistent with key_alloc. Also, fix the similar problem in keyctl_chown_key(). Fixes: 0b77f5bfb45c ("keys: make the keyring quotas controllable through /proc/sys") Fixes: a08bf91ce28e ("KEYS: allow reaching the keys quotas exactly") Cc: stable@vger.kernel.org # 5.0.x Cc: Eric Biggers Signed-off-by: Yang Xu Reviewed-by: Jarkko Sakkinen Reviewed-by: Eric Biggers Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- security/keys/key.c | 2 +- security/keys/keyctl.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) --- a/security/keys/key.c +++ b/security/keys/key.c @@ -381,7 +381,7 @@ int key_payload_reserve(struct key *key, spin_lock(&key->user->lock); if (delta > 0 && - (key->user->qnbytes + delta >= maxbytes || + (key->user->qnbytes + delta > maxbytes || key->user->qnbytes + delta < key->user->qnbytes)) { ret = -EDQUOT; } --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -937,8 +937,8 @@ long keyctl_chown_key(key_serial_t id, u key_quota_root_maxbytes : key_quota_maxbytes; spin_lock(&newowner->lock); - if (newowner->qnkeys + 1 >= maxkeys || - newowner->qnbytes + key->quotalen >= maxbytes || + if (newowner->qnkeys + 1 > maxkeys || + newowner->qnbytes + key->quotalen > maxbytes || newowner->qnbytes + key->quotalen < newowner->qnbytes) goto quota_overrun;