From patchwork Thu Jan 20 21:49:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Scott Mayhew X-Patchwork-Id: 12719094 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A912C433FE for ; Thu, 20 Jan 2022 21:50:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377998AbiATVt6 (ORCPT ); Thu, 20 Jan 2022 16:49:58 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:47221 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378012AbiATVt5 (ORCPT ); Thu, 20 Jan 2022 16:49:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1642715396; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rty4gjVzENPNVoxsZdxNcd5C7M5E9kOrqI2SunpngqI=; b=CEYqoU2JDu7zz65AEOgdxljvxpOR/n1f9PfS4jLCKC3LA/FXLZDHFBPZn3C78dHhUR+eve xGp2TzcL+t+OyIb/h61rf/5T/CrcpyCSWbPv2KQhvgnLe2jLp+QALDxzI4aNy0bus9o2U1 dowEc4W90ovtDP5kW4Y42Tv5UEWSUSs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-339-M-ApFgvZNMygeKnqcN2JFA-1; Thu, 20 Jan 2022 16:49:50 -0500 X-MC-Unique: M-ApFgvZNMygeKnqcN2JFA-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id D530A1006AA4; Thu, 20 Jan 2022 21:49:49 +0000 (UTC) Received: from aion.usersys.redhat.com (unknown [10.22.8.154]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A5928E710; Thu, 20 Jan 2022 21:49:49 +0000 (UTC) Received: by aion.usersys.redhat.com (Postfix, from userid 1000) id DFFBF1A0021; Thu, 20 Jan 2022 16:49:48 -0500 (EST) From: Scott Mayhew To: selinux@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH RFC v2 2/2] selinux: try to use preparsed sid before calling parse_sid() Date: Thu, 20 Jan 2022 16:49:48 -0500 Message-Id: <20220120214948.3637895-3-smayhew@redhat.com> In-Reply-To: <20220120214948.3637895-1-smayhew@redhat.com> References: <20220120214948.3637895-1-smayhew@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Avoid unnecessary parsing of sids that have already been parsed via selinux_sb_eat_lsm_opts(). Signed-off-by: Scott Mayhew --- security/selinux/hooks.c | 85 ++++++++++++++++++++++++++++------------ 1 file changed, 61 insertions(+), 24 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index f27ca9e870c0..28ba5c8529fa 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -677,36 +677,52 @@ static int selinux_set_mnt_opts(struct super_block *sb, */ if (opts) { if (opts->fscontext) { - rc = parse_sid(sb, opts->fscontext, &fscontext_sid); - if (rc) - goto out; + if (opts->preparsed & FSCONTEXT_MNT) + fscontext_sid = opts->fscontext_sid; + else { + rc = parse_sid(sb, opts->fscontext, &fscontext_sid); + if (rc) + goto out; + } if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, fscontext_sid)) goto out_double_mount; sbsec->flags |= FSCONTEXT_MNT; } if (opts->context) { - rc = parse_sid(sb, opts->context, &context_sid); - if (rc) - goto out; + if (opts->preparsed & CONTEXT_MNT) + context_sid = opts->context_sid; + else { + rc = parse_sid(sb, opts->context, &context_sid); + if (rc) + goto out; + } if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, context_sid)) goto out_double_mount; sbsec->flags |= CONTEXT_MNT; } if (opts->rootcontext) { - rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid); - if (rc) - goto out; + if (opts->preparsed & ROOTCONTEXT_MNT) + rootcontext_sid = opts->rootcontext_sid; + else { + rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid); + if (rc) + goto out; + } if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, rootcontext_sid)) goto out_double_mount; sbsec->flags |= ROOTCONTEXT_MNT; } if (opts->defcontext) { - rc = parse_sid(sb, opts->defcontext, &defcontext_sid); - if (rc) - goto out; + if (opts->preparsed & DEFCONTEXT_MNT) + defcontext_sid = opts->defcontext_sid; + else { + rc = parse_sid(sb, opts->defcontext, &defcontext_sid); + if (rc) + goto out; + } if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, defcontext_sid)) goto out_double_mount; @@ -2753,32 +2769,48 @@ static int selinux_sb_remount(struct super_block *sb, void *mnt_opts) return 0; if (opts->fscontext) { - rc = parse_sid(sb, opts->fscontext, &sid); - if (rc) - return rc; + if (opts->preparsed & FSCONTEXT_MNT) + sid = opts->fscontext_sid; + else { + rc = parse_sid(sb, opts->fscontext, &sid); + if (rc) + return rc; + } if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid)) goto out_bad_option; } if (opts->context) { - rc = parse_sid(sb, opts->context, &sid); - if (rc) - return rc; + if (opts->preparsed & CONTEXT_MNT) + sid = opts->context_sid; + else { + rc = parse_sid(sb, opts->context, &sid); + if (rc) + return rc; + } if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid)) goto out_bad_option; } if (opts->rootcontext) { struct inode_security_struct *root_isec; root_isec = backing_inode_security(sb->s_root); - rc = parse_sid(sb, opts->rootcontext, &sid); - if (rc) - return rc; + if (opts->preparsed & ROOTCONTEXT_MNT) + sid = opts->rootcontext_sid; + else { + rc = parse_sid(sb, opts->rootcontext, &sid); + if (rc) + return rc; + } if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid)) goto out_bad_option; } if (opts->defcontext) { - rc = parse_sid(sb, opts->defcontext, &sid); - if (rc) - return rc; + if (opts->preparsed & DEFCONTEXT_MNT) + sid = opts->defcontext_sid; + else { + rc = parse_sid(sb, opts->defcontext, &sid); + if (rc) + return rc; + } if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid)) goto out_bad_option; } @@ -2877,6 +2909,11 @@ static int selinux_fs_context_dup(struct fs_context *fc, if (!opts->defcontext) return -ENOMEM; } + opts->fscontext_sid = src->fscontext_sid; + opts->context_sid = src->context_sid; + opts->rootcontext_sid = src->rootcontext_sid; + opts->defcontext_sid = src->defcontext_sid; + opts->preparsed = src->preparsed; return 0; }