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=-12.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 6F903C433E1 for ; Wed, 29 Jul 2020 00:30:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A9272078E for ; Wed, 29 Jul 2020 00:30:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730766AbgG2AaW (ORCPT ); Tue, 28 Jul 2020 20:30:22 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:44211 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730536AbgG2AaW (ORCPT ); Tue, 28 Jul 2020 20:30:22 -0400 Received: from static-50-53-54-182.bvtn.or.frontiernet.net ([50.53.54.182] helo=[192.168.192.153]) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1k0Zz5-0003r6-Mk; Wed, 29 Jul 2020 00:30:15 +0000 Subject: Re: [PATCH v19 06/23] LSM: Use lsmblob in security_secctx_to_secid To: Casey Schaufler , casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: linux-audit@redhat.com, keescook@chromium.org, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, netdev@vger.kernel.org References: <20200724203226.16374-1-casey@schaufler-ca.com> <20200724203226.16374-7-casey@schaufler-ca.com> <8dd6f4e0-07f0-333e-0663-0bc0889cccf2@schaufler-ca.com> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= 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X-Mailing-List: selinux@vger.kernel.org On 7/28/20 4:41 PM, Casey Schaufler wrote: > On 7/28/2020 4:11 AM, John Johansen wrote: >> On 7/24/20 1:32 PM, Casey Schaufler wrote: >>> Change security_secctx_to_secid() to fill in a lsmblob instead >>> of a u32 secid. Multiple LSMs may be able to interpret the >>> string, and this allows for setting whichever secid is >>> appropriate. Change security_secmark_relabel_packet() to use a >>> lsmblob instead of a u32 secid. In some other cases there is >>> scaffolding where interfaces have yet to be converted. >>> >>> Reviewed-by: Kees Cook >>> Signed-off-by: Casey Schaufler >>> Cc: netdev@vger.kernel.org >> one comment below, but its a nice to have so >> >> Reviewed-by: John Johansen >> >> >>> --- >>> include/linux/security.h | 30 +++++++++++++++++++++++---- >>> include/net/scm.h | 7 +++++-- >>> kernel/cred.c | 4 +--- >>> net/ipv4/ip_sockglue.c | 6 ++++-- >>> net/netfilter/nft_meta.c | 18 +++++++++------- >>> net/netfilter/xt_SECMARK.c | 9 ++++++-- >>> net/netlabel/netlabel_unlabeled.c | 23 +++++++++++++-------- >>> security/security.c | 34 ++++++++++++++++++++++++++----- >>> 8 files changed, 98 insertions(+), 33 deletions(-) >>> >>> diff --git a/include/linux/security.h b/include/linux/security.h >>> index d81e8886d799..98176faaaba5 100644 >>> --- a/include/linux/security.h >>> +++ b/include/linux/security.h >>> @@ -189,6 +189,27 @@ static inline bool lsmblob_equal(struct lsmblob *bloba, struct lsmblob *blobb) >>> return !memcmp(bloba, blobb, sizeof(*bloba)); >>> } >>> >>> +/** >>> + * lsmblob_value - find the first non-zero value in an lsmblob structure. >>> + * @blob: Pointer to the data >>> + * >>> + * This needs to be used with extreme caution, as the cases where >>> + * it is appropriate are rare. >>> + * >>> + * Return the first secid value set in the lsmblob. >>> + * There should only be one. >> It would be really nice if we could have an LSM debug config, that would >> do things like checking there is indeed only one value when this fn >> is called. > > I can't see a CONFIG_LSM_DEBUG for this alone, but if you have > other places you'd like to see it I'm open to it. > yeah there are a few other places, this really isn't a requirement just a thought while I was going through these again. I will have to spend some time chasing them down. Maybe even cobble together a patch