From patchwork Mon Dec 21 16:55:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Guy Briggs X-Patchwork-Id: 346942 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 8DC12C41518 for ; Mon, 21 Dec 2020 16:59:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 72A2322B3B for ; Mon, 21 Dec 2020 16:59:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726290AbgLUQ66 (ORCPT ); Mon, 21 Dec 2020 11:58:58 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:30218 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726204AbgLUQ6z (ORCPT ); Mon, 21 Dec 2020 11:58:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1608569848; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=7tVw7A/wy5RMR226GkU3lOIczYAEPwjFZmoIZv6CVc0=; b=fLylPw4zAwXsXvwp08SVdTcfbYSnOpNB9em8vlcGydtikTqdXfjoAS3vsuLYKowT+1o5jZ dVeoucfsSWzh2qXDN1OT79z5L+lUpkRW18PMIDMXc85Og29VIifRXCpBzourRRo+1lwg33 gOM5ZHuKaahAA0ZdV9mxCL8o17fJ37U= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-251-iEQgwG9_M1-B0voMyRpePQ-1; Mon, 21 Dec 2020 11:57:26 -0500 X-MC-Unique: iEQgwG9_M1-B0voMyRpePQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id CCB7C100C600; Mon, 21 Dec 2020 16:57:23 +0000 (UTC) Received: from madcap2.tricolour.ca (unknown [10.10.110.9]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0F28660C0F; Mon, 21 Dec 2020 16:57:09 +0000 (UTC) From: Richard Guy Briggs To: Linux Containers List , Linux API , Linux-Audit Mailing List , Linux FSdevel , LKML , Linux NetDev Upstream Mailing List , Netfilter Devel List Cc: Neil Horman , David Howells , "Eric W. Biederman" , Simo Sorce , Eric Paris , mpatel@redhat.com, Serge Hallyn , Kees Cook , Jens Axboe , Christian Brauner , Richard Guy Briggs Subject: [PATCH ghak90 v10 05/11] audit: add support for non-syscall auxiliary records Date: Mon, 21 Dec 2020 11:55:39 -0500 Message-Id: <95024db7dc025fd9b804dd66a18e1264f981e25f.1608225886.git.rgb@redhat.com> In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Standalone audit records have the timestamp and serial number generated on the fly and as such are unique, making them standalone. This new function audit_alloc_local() generates a local audit context that will be used only for a standalone record and its auxiliary record(s). The context is discarded immediately after the local associated records are produced. A new flag, "local" was used rather than "in_syscall" since it would be overloading the original purpose and meaning. Events using this function may not be triggered by a syscall but still need records linked by timestamp and serial. Signed-off-by: Richard Guy Briggs Acked-by: Serge Hallyn Acked-by: Neil Horman Reviewed-by: Ondrej Mosnacek --- include/linux/audit.h | 8 ++++++++ kernel/audit.h | 1 + kernel/auditsc.c | 31 ++++++++++++++++++++++++++----- 3 files changed, 35 insertions(+), 5 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index 7c1928e75cfe..9f0238f7960f 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -304,6 +304,8 @@ static inline int audit_signal_info(int sig, struct task_struct *t) /* These are defined in auditsc.c */ /* Public API */ +extern struct audit_context *audit_alloc_local(gfp_t gfpflags); +extern void audit_free_context(struct audit_context *context); extern void __audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3); extern void __audit_syscall_exit(int ret_success, long ret_value); @@ -555,6 +557,12 @@ static inline void audit_log_nfcfg(const char *name, u8 af, extern int audit_n_rules; extern int audit_signals; #else /* CONFIG_AUDITSYSCALL */ +static inline struct audit_context *audit_alloc_local(gfp_t gfpflags) +{ + return NULL; +} +static inline void audit_free_context(struct audit_context *context) +{ } static inline void audit_syscall_entry(int major, unsigned long a0, unsigned long a1, unsigned long a2, unsigned long a3) diff --git a/kernel/audit.h b/kernel/audit.h index de79f59d623f..40e609787a0c 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -98,6 +98,7 @@ struct audit_proctitle { struct audit_context { int dummy; /* must be the first element */ int in_syscall; /* 1 if task is in a syscall */ + bool local; /* local context needed */ enum audit_state state, current_state; unsigned int serial; /* serial number for record */ int major; /* syscall number */ diff --git a/kernel/auditsc.c b/kernel/auditsc.c index eecc7b2e29a7..df26d0aa5e6d 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -920,11 +920,12 @@ static inline void audit_free_aux(struct audit_context *context) } } -static inline struct audit_context *audit_alloc_context(enum audit_state state) +static inline struct audit_context *audit_alloc_context(enum audit_state state, + gfp_t gfpflags) { struct audit_context *context; - context = kzalloc(sizeof(*context), GFP_KERNEL); + context = kzalloc(sizeof(*context), gfpflags); if (!context) return NULL; context->state = state; @@ -962,7 +963,8 @@ int audit_alloc_syscall(struct task_struct *tsk) return 0; } - if (!(context = audit_alloc_context(state))) { + context = audit_alloc_context(state, GFP_KERNEL); + if (!context) { kfree(key); audit_log_lost("out of memory in audit_alloc_syscall"); return -ENOMEM; @@ -974,8 +976,26 @@ int audit_alloc_syscall(struct task_struct *tsk) return 0; } -static inline void audit_free_context(struct audit_context *context) +struct audit_context *audit_alloc_local(gfp_t gfpflags) { + struct audit_context *context; + + context = audit_alloc_context(AUDIT_RECORD_CONTEXT, gfpflags); + if (!context) { + audit_log_lost("out of memory in audit_alloc_local"); + return NULL; + } + context->serial = audit_serial(); + ktime_get_coarse_real_ts64(&context->ctime); + context->local = true; + return context; +} +EXPORT_SYMBOL(audit_alloc_local); + +void audit_free_context(struct audit_context *context) +{ + if (!context) + return; audit_free_module(context); audit_free_names(context); unroll_tree_refs(context, NULL, 0); @@ -986,6 +1006,7 @@ static inline void audit_free_context(struct audit_context *context) audit_proctitle_free(context); kfree(context); } +EXPORT_SYMBOL(audit_free_context); static int audit_log_pid_context(struct audit_context *context, pid_t pid, kuid_t auid, kuid_t uid, unsigned int sessionid, @@ -2223,7 +2244,7 @@ EXPORT_SYMBOL_GPL(__audit_inode_child); int auditsc_get_stamp(struct audit_context *ctx, struct timespec64 *t, unsigned int *serial) { - if (!ctx->in_syscall) + if (!ctx->in_syscall && !ctx->local) return 0; if (!ctx->serial) ctx->serial = audit_serial();