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,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 1939CC433E0 for ; Fri, 19 Jun 2020 14:45:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE43420A8B for ; Fri, 19 Jun 2020 14:45:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592577911; bh=hvxXd98s1xuuB7y/wMyWIq6EcmcDp8SLLGhH+YGV4hM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Qa612hjG/9SXjcYbFjPStWfrla9Og7xsx8Y3myL9oxSXrR4+iSOGu8FDwPCxam8bw lPeaHP6bbb+idxKYOiilfcNDkkM7FBsJrdxBjiqzIrHAHk+i3+EFtVA/T1vwIABKsA ky6LWjmFBe+OG/cPLsittrVjvXXiKZ/bMHSfKXM4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388658AbgFSOpI (ORCPT ); Fri, 19 Jun 2020 10:45:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:36034 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388511AbgFSOoq (ORCPT ); Fri, 19 Jun 2020 10:44:46 -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 D698D21556; Fri, 19 Jun 2020 14:44:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592577886; bh=hvxXd98s1xuuB7y/wMyWIq6EcmcDp8SLLGhH+YGV4hM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nWW7vKmurt21fiDv5bIVTAN21hRQoS7POH5N2lEw4+L8e4BB8HHl61/QdPG8fw5pj fjP3oCqEymX7zIijpmn3dMjrJqGTbdoFK9h/dR+JdyAy49nAFfedM2/ZrzX1G3eyOi EQHTnlhE63A0/T/Ra6/Py67oLnx5MESnfAPWT5aY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, NeilBrown , "J. Bruce Fields" Subject: [PATCH 4.9 122/128] sunrpc: svcauth_gss_register_pseudoflavor must reject duplicate registrations. Date: Fri, 19 Jun 2020 16:33:36 +0200 Message-Id: <20200619141626.552690183@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141620.148019466@linuxfoundation.org> References: <20200619141620.148019466@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: NeilBrown commit d47a5dc2888fd1b94adf1553068b8dad76cec96c upstream. There is no valid case for supporting duplicate pseudoflavor registrations. Currently the silent acceptance of such registrations is hiding a bug. The rpcsec_gss_krb5 module registers 2 flavours but does not unregister them, so if you load, unload, reload the module, it will happily continue to use the old registration which now has pointers to the memory were the module was originally loaded. This could lead to unexpected results. So disallow duplicate registrations. Link: https://bugzilla.kernel.org/show_bug.cgi?id=206651 Cc: stable@vger.kernel.org (v2.6.12+) Signed-off-by: NeilBrown Signed-off-by: J. Bruce Fields Signed-off-by: Greg Kroah-Hartman --- net/sunrpc/auth_gss/svcauth_gss.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -796,9 +796,11 @@ svcauth_gss_register_pseudoflavor(u32 ps new->h.flavour = &svcauthops_gss; new->pseudoflavor = pseudoflavor; - stat = 0; test = auth_domain_lookup(name, &new->h); - if (test != &new->h) { /* Duplicate registration */ + if (test != &new->h) { + pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n", + name); + stat = -EADDRINUSE; auth_domain_put(test); kfree(new->h.name); goto out_free_dom;