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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation version 2 of the license extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 315 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
188 lines
4.8 KiB
C
188 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* AppArmor security module
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*
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* This file contains AppArmor contexts used to associate "labels" to objects.
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*/
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#ifndef __AA_CONTEXT_H
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#define __AA_CONTEXT_H
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#include <linux/cred.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include "label.h"
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#include "policy_ns.h"
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#include "task.h"
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static inline struct aa_label *cred_label(const struct cred *cred)
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{
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struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
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AA_BUG(!blob);
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return *blob;
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}
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static inline void set_cred_label(const struct cred *cred,
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struct aa_label *label)
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{
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struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred;
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AA_BUG(!blob);
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*blob = label;
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}
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/**
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* aa_cred_raw_label - obtain cred's label
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* @cred: cred to obtain label from (NOT NULL)
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*
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* Returns: confining label
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*
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* does NOT increment reference count
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*/
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static inline struct aa_label *aa_cred_raw_label(const struct cred *cred)
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{
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struct aa_label *label = cred_label(cred);
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AA_BUG(!label);
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return label;
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}
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/**
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* aa_get_newest_cred_label - obtain the newest label on a cred
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* @cred: cred to obtain label from (NOT NULL)
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*
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* Returns: newest version of confining label
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*/
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static inline struct aa_label *aa_get_newest_cred_label(const struct cred *cred)
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{
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return aa_get_newest_label(aa_cred_raw_label(cred));
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}
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/**
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* __aa_task_raw_label - retrieve another task's label
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* @task: task to query (NOT NULL)
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*
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* Returns: @task's label without incrementing its ref count
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*
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* If @task != current needs to be called in RCU safe critical section
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*/
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static inline struct aa_label *__aa_task_raw_label(struct task_struct *task)
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{
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return aa_cred_raw_label(__task_cred(task));
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}
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/**
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* aa_current_raw_label - find the current tasks confining label
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*
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* Returns: up to date confining label or the ns unconfined label (NOT NULL)
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*
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* This fn will not update the tasks cred to the most up to date version
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* of the label so it is safe to call when inside of locks.
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*/
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static inline struct aa_label *aa_current_raw_label(void)
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{
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return aa_cred_raw_label(current_cred());
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}
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/**
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* aa_get_current_label - get the newest version of the current tasks label
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*
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* Returns: newest version of confining label (NOT NULL)
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*
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* This fn will not update the tasks cred, so it is safe inside of locks
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*
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* The returned reference must be put with aa_put_label()
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*/
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static inline struct aa_label *aa_get_current_label(void)
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{
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struct aa_label *l = aa_current_raw_label();
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if (label_is_stale(l))
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return aa_get_newest_label(l);
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return aa_get_label(l);
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}
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#define __end_current_label_crit_section(X) end_current_label_crit_section(X)
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/**
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* end_label_crit_section - put a reference found with begin_current_label..
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* @label: label reference to put
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*
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* Should only be used with a reference obtained with
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* begin_current_label_crit_section and never used in situations where the
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* task cred may be updated
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*/
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static inline void end_current_label_crit_section(struct aa_label *label)
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{
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if (label != aa_current_raw_label())
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aa_put_label(label);
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}
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/**
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* __begin_current_label_crit_section - current's confining label
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*
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* Returns: up to date confining label or the ns unconfined label (NOT NULL)
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*
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* safe to call inside locks
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*
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* The returned reference must be put with __end_current_label_crit_section()
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* This must NOT be used if the task cred could be updated within the
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* critical section between __begin_current_label_crit_section() ..
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* __end_current_label_crit_section()
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*/
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static inline struct aa_label *__begin_current_label_crit_section(void)
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{
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struct aa_label *label = aa_current_raw_label();
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if (label_is_stale(label))
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label = aa_get_newest_label(label);
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return label;
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}
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/**
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* begin_current_label_crit_section - current's confining label and update it
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*
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* Returns: up to date confining label or the ns unconfined label (NOT NULL)
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*
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* Not safe to call inside locks
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*
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* The returned reference must be put with end_current_label_crit_section()
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* This must NOT be used if the task cred could be updated within the
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* critical section between begin_current_label_crit_section() ..
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* end_current_label_crit_section()
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*/
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static inline struct aa_label *begin_current_label_crit_section(void)
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{
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struct aa_label *label = aa_current_raw_label();
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might_sleep();
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if (label_is_stale(label)) {
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label = aa_get_newest_label(label);
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if (aa_replace_current_label(label) == 0)
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/* task cred will keep the reference */
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aa_put_label(label);
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}
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return label;
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}
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static inline struct aa_ns *aa_get_current_ns(void)
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{
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struct aa_label *label;
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struct aa_ns *ns;
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label = __begin_current_label_crit_section();
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ns = aa_get_ns(labels_ns(label));
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__end_current_label_crit_section(label);
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return ns;
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}
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#endif /* __AA_CONTEXT_H */
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