/* * AppArmor security module * * This file contains AppArmor contexts used to associate "labels" to objects. * * Copyright (C) 1998-2008 Novell/SUSE * Copyright 2009-2010 Canonical Ltd. * * 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. */ #ifndef __AA_CONTEXT_H#define __AA_CONTEXT_H #include <linux/cred.h>#include <linux/slab.h>#include <linux/sched.h> #include "policy.h"#include "policy_ns.h" #define cred_ctx(X) ((X)->security)#define current_ctx() cred_ctx(current_cred()) /* struct aa_file_ctx - the AppArmor context the file was opened in * @perms: the permission the file was opened with * * The file_ctx could currently be directly stored in file->f_security * as the profile reference is now stored in the f_cred.  However the * ctx struct will expand in the future so we keep the struct. */struct aa_file_ctx {	u16 allow;}; /** * aa_alloc_file_context - allocate file_ctx * @gfp: gfp flags for allocation * * Returns: file_ctx or NULL on failure */static inline struct aa_file_ctx *aa_alloc_file_context(gfp_t gfp){	return kzalloc(sizeof(struct aa_file_ctx), gfp);} /** * aa_free_file_context - free a file_ctx * @ctx: file_ctx to free  (MAYBE_NULL) */static inline void aa_free_file_context(struct aa_file_ctx *ctx){	if (ctx)		kzfree(ctx);} /** * struct aa_task_ctx - primary label for confined tasks * @profile: the current profile   (NOT NULL) * @exec: profile to transition to on next exec  (MAYBE NULL) * @previous: profile the task may return to     (MAYBE NULL) * @token: magic value the task must know for returning to @previous_profile * * Contains the task's current profile (which could change due to * change_hat).  Plus the hat_magic needed during change_hat. * * TODO: make so a task can be confined by a stack of contexts */struct aa_task_ctx {	struct aa_profile *profile;	struct aa_profile *onexec;	struct aa_profile *previous;	u64 token;}; struct aa_task_ctx *aa_alloc_task_context(gfp_t flags);void aa_free_task_context(struct aa_task_ctx *ctx);void aa_dup_task_context(struct aa_task_ctx *new,			 const struct aa_task_ctx *old);int aa_replace_current_profile(struct aa_profile *profile);int aa_set_current_onexec(struct aa_profile *profile);int aa_set_current_hat(struct aa_profile *profile, u64 token);int aa_restore_previous_profile(u64 cookie);struct aa_profile *aa_get_task_profile(struct task_struct *task);  /** * aa_cred_profile - obtain cred's profiles * @cred: cred to obtain profiles from  (NOT NULL) * * Returns: confining profile * * does NOT increment reference count */static inline struct aa_profile *aa_cred_profile(const struct cred *cred){	struct aa_task_ctx *ctx = cred_ctx(cred); 	AA_BUG(!ctx || !ctx->profile);	return ctx->profile;} /** * __aa_task_profile - retrieve another task's profile * @task: task to query  (NOT NULL) * * Returns: @task's profile without incrementing its ref count * * If @task != current needs to be called in RCU safe critical section */static inline struct aa_profile *__aa_task_profile(struct task_struct *task){	return aa_cred_profile(__task_cred(task));} /** * __aa_task_is_confined - determine if @task has any confinement * @task: task to check confinement of  (NOT NULL) * * If @task != current needs to be called in RCU safe critical section */static inline bool __aa_task_is_confined(struct task_struct *task){	return !unconfined(__aa_task_profile(task));} /** * __aa_current_profile - find the current tasks confining profile * * Returns: up to date confining profile or the ns unconfined profile (NOT NULL) * * This fn will not update the tasks cred to the most up to date version * of the profile so it is safe to call when inside of locks. */static inline struct aa_profile *__aa_current_profile(void){	return aa_cred_profile(current_cred());} /** * aa_current_profile - find the current tasks confining profile and do updates * * Returns: up to date confining profile or the ns unconfined profile (NOT NULL) * * This fn will update the tasks cred structure if the profile has been * replaced.  Not safe to call inside locks */static inline struct aa_profile *aa_current_profile(void){	const struct aa_task_ctx *ctx = current_ctx();	struct aa_profile *profile; 	AA_BUG(!ctx || !ctx->profile); 	if (profile_is_stale(ctx->profile)) {		profile = aa_get_newest_profile(ctx->profile);		aa_replace_current_profile(profile);		aa_put_profile(profile);		ctx = current_ctx();	} 	return ctx->profile;} static inline struct aa_ns *aa_get_current_ns(void){	return aa_get_ns(__aa_current_profile()->ns);} /** * aa_clear_task_ctx_trans - clear transition tracking info from the ctx * @ctx: task context to clear (NOT NULL) */static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx){	aa_put_profile(ctx->previous);	aa_put_profile(ctx->onexec);	ctx->previous = NULL;	ctx->onexec = NULL;	ctx->token = 0;} #endif /* __AA_CONTEXT_H */