[linux-2.6-block.git] / include / linux / cred.h

/* Credentials management - see Documentation/security/credentials.txt
 *
 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#ifndef _LINUX_CRED_H
#define _LINUX_CRED_H

#include <linux/capability.h>
#include <linux/init.h>
#include <linux/key.h>
#include <linux/selinux.h>
#include <linux/atomic.h>
#include <linux/uidgid.h>

struct user_struct;
struct cred;
struct inode;

/*
 * COW Supplementary groups list
 */
#define NGROUPS_SMALL		32
#define NGROUPS_PER_BLOCK	((unsigned int)(PAGE_SIZE / sizeof(kgid_t)))

struct group_info {
	atomic_t	usage;
	int		ngroups;
	int		nblocks;
	kgid_t		small_block[NGROUPS_SMALL];
	kgid_t		*blocks[0];
};

/**
 * get_group_info - Get a reference to a group info structure
 * @group_info: The group info to reference
 *
 * This gets a reference to a set of supplementary groups.
 *
 * If the caller is accessing a task's credentials, they must hold the RCU read
 * lock when reading.
 */
static inline struct group_info *get_group_info(struct group_info *gi)
{
	atomic_inc(&gi->usage);
	return gi;
}

/**
 * put_group_info - Release a reference to a group info structure
 * @group_info: The group info to release
 */
#define put_group_info(group_info)			\
do {							\
	if (atomic_dec_and_test(&(group_info)->usage))	\
		groups_free(group_info);		\
} while (0)

extern struct group_info init_groups;
#ifdef CONFIG_MULTIUSER
extern struct group_info *groups_alloc(int);
extern void groups_free(struct group_info *);

extern int in_group_p(kgid_t);
extern int in_egroup_p(kgid_t);
#else
static inline void groups_free(struct group_info *group_info)
{
}

static inline int in_group_p(kgid_t grp)
{
        return 1;
}
static inline int in_egroup_p(kgid_t grp)
{
        return 1;
}
#endif
extern int set_current_groups(struct group_info *);
extern void set_groups(struct cred *, struct group_info *);
extern int groups_search(const struct group_info *, kgid_t);
extern bool may_setgroups(void);

/* access the groups "array" with this macro */
#define GROUP_AT(gi, i) \
	((gi)->blocks[(i) / NGROUPS_PER_BLOCK][(i) % NGROUPS_PER_BLOCK])

/*
 * The security context of a task
 *
 * The parts of the context break down into two categories:
 *
 *  (1) The objective context of a task.  These parts are used when some other
 *	task is attempting to affect this one.
 *
 *  (2) The subjective context.  These details are used when the task is acting
 *	upon another object, be that a file, a task, a key or whatever.
 *
 * Note that some members of this structure belong to both categories - the
 * LSM security pointer for instance.
 *
 * A task has two security pointers.  task->real_cred points to the objective
 * context that defines that task's actual details.  The objective part of this
 * context is used whenever that task is acted upon.
 *
 * task->cred points to the subjective context that defines the details of how
 * that task is going to act upon another object.  This may be overridden
 * temporarily to point to another security context, but normally points to the
 * same context as task->real_cred.
 */
struct cred {
	atomic_t	usage;
#ifdef CONFIG_DEBUG_CREDENTIALS
	atomic_t	subscribers;	/* number of processes subscribed */
	void		*put_addr;
	unsigned	magic;
#define CRED_MAGIC	0x43736564
#define CRED_MAGIC_DEAD	0x44656144
#endif
	kuid_t		uid;		/* real UID of the task */
	kgid_t		gid;		/* real GID of the task */
	kuid_t		suid;		/* saved UID of the task */
	kgid_t		sgid;		/* saved GID of the task */
	kuid_t		euid;		/* effective UID of the task */
	kgid_t		egid;		/* effective GID of the task */
	kuid_t		fsuid;		/* UID for VFS ops */
	kgid_t		fsgid;		/* GID for VFS ops */
	unsigned	securebits;	/* SUID-less security management */
	kernel_cap_t	cap_inheritable; /* caps our children can inherit */
	kernel_cap_t	cap_permitted;	/* caps we're permitted */
	kernel_cap_t	cap_effective;	/* caps we can actually use */
	kernel_cap_t	cap_bset;	/* capability bounding set */
#ifdef CONFIG_KEYS
	unsigned char	jit_keyring;	/* default keyring to attach requested
					 * keys to */
	struct key __rcu *session_keyring; /* keyring inherited over fork */
	struct key	*process_keyring; /* keyring private to this process */
	struct key	*thread_keyring; /* keyring private to this thread */
	struct key	*request_key_auth; /* assumed request_key authority */
#endif
#ifdef CONFIG_SECURITY
	void		*security;	/* subjective LSM security */
#endif
	struct user_struct *user;	/* real user ID subscription */
	struct user_namespace *user_ns; /* user_ns the caps and keyrings are relative to. */
	struct group_info *group_info;	/* supplementary groups for euid/fsgid */
	struct rcu_head	rcu;		/* RCU deletion hook */
};

extern void __put_cred(struct cred *);
extern void exit_creds(struct task_struct *);
extern int copy_creds(struct task_struct *, unsigned long);
extern const struct cred *get_task_cred(struct task_struct *);
extern struct cred *cred_alloc_blank(void);
extern struct cred *prepare_creds(void);
extern struct cred *prepare_exec_creds(void);
extern int commit_creds(struct cred *);
extern void abort_creds(struct cred *);
extern const struct cred *override_creds(const struct cred *);
extern void revert_creds(const struct cred *);
extern struct cred *prepare_kernel_cred(struct task_struct *);
extern int change_create_files_as(struct cred *, struct inode *);
extern int set_security_override(struct cred *, u32);
extern int set_security_override_from_ctx(struct cred *, const char *);
extern int set_create_files_as(struct cred *, struct inode *);
extern void __init cred_init(void);

/*
 * check for validity of credentials
 */
#ifdef CONFIG_DEBUG_CREDENTIALS
extern void __invalid_creds(const struct cred *, const char *, unsigned);
extern void __validate_process_creds(struct task_struct *,
				     const char *, unsigned);

extern bool creds_are_invalid(const struct cred *cred);

static inline void __validate_creds(const struct cred *cred,
				    const char *file, unsigned line)
{
	if (unlikely(creds_are_invalid(cred)))
		__invalid_creds(cred, file, line);
}

#define validate_creds(cred)				\
do {							\
	__validate_creds((cred), __FILE__, __LINE__);	\
} while(0)

#define validate_process_creds()				\
do {								\
	__validate_process_creds(current, __FILE__, __LINE__);	\
} while(0)

extern void validate_creds_for_do_exit(struct task_struct *);
#else
static inline void validate_creds(const struct cred *cred)
{
}
static inline void validate_creds_for_do_exit(struct task_struct *tsk)
{
}
static inline void validate_process_creds(void)
{
}
#endif

/**
 * get_new_cred - Get a reference on a new set of credentials
 * @cred: The new credentials to reference
 *
 * Get a reference on the specified set of new credentials.  The caller must
 * release the reference.
 */
static inline struct cred *get_new_cred(struct cred *cred)
{
	atomic_inc(&cred->usage);
	return cred;
}

/**
 * get_cred - Get a reference on a set of credentials
 * @cred: The credentials to reference
 *
 * Get a reference on the specified set of credentials.  The caller must
 * release the reference.
 *
 * This is used to deal with a committed set of credentials.  Although the
 * pointer is const, this will temporarily discard the const and increment the
 * usage count.  The purpose of this is to attempt to catch at compile time the
 * accidental alteration of a set of credentials that should be considered
 * immutable.
 */
static inline const struct cred *get_cred(const struct cred *cred)
{
	struct cred *nonconst_cred = (struct cred *) cred;
	validate_creds(cred);
	return get_new_cred(nonconst_cred);
}

/**
 * put_cred - Release a reference to a set of credentials
 * @cred: The credentials to release
 *
 * Release a reference to a set of credentials, deleting them when the last ref
 * is released.
 *
 * This takes a const pointer to a set of credentials because the credentials
 * on task_struct are attached by const pointers to prevent accidental
 * alteration of otherwise immutable credential sets.
 */
static inline void put_cred(const struct cred *_cred)
{
	struct cred *cred = (struct cred *) _cred;

	validate_creds(cred);
	if (atomic_dec_and_test(&(cred)->usage))
		__put_cred(cred);
}

/**
 * current_cred - Access the current task's subjective credentials
 *
 * Access the subjective credentials of the current task.  RCU-safe,
 * since nobody else can modify it.
 */
#define current_cred() \
	rcu_dereference_protected(current->cred, 1)

/**
 * current_real_cred - Access the current task's objective credentials
 *
 * Access the objective credentials of the current task.  RCU-safe,
 * since nobody else can modify it.
 */
#define current_real_cred() \
	rcu_dereference_protected(current->real_cred, 1)

/**
 * __task_cred - Access a task's objective credentials
 * @task: The task to query
 *
 * Access the objective credentials of a task.  The caller must hold the RCU
 * readlock.
 *
 * The result of this function should not be passed directly to get_cred();
 * rather get_task_cred() should be used instead.
 */
#define __task_cred(task)	\
	rcu_dereference((task)->real_cred)

/**
 * get_current_cred - Get the current task's subjective credentials
 *
 * Get the subjective credentials of the current task, pinning them so that
 * they can't go away.  Accessing the current task's credentials directly is
 * not permitted.
 */
#define get_current_cred()				\
	(get_cred(current_cred()))

/**
 * get_current_user - Get the current task's user_struct
 *
 * Get the user record of the current task, pinning it so that it can't go
 * away.
 */
#define get_current_user()				\
({							\
	struct user_struct *__u;			\
	const struct cred *__cred;			\
	__cred = current_cred();			\
	__u = get_uid(__cred->user);			\
	__u;						\
})

/**
 * get_current_groups - Get the current task's supplementary group list
 *
 * Get the supplementary group list of the current task, pinning it so that it
 * can't go away.
 */
#define get_current_groups()				\
({							\
	struct group_info *__groups;			\
	const struct cred *__cred;			\
	__cred = current_cred();			\
	__groups = get_group_info(__cred->group_info);	\
	__groups;					\
})

#define task_cred_xxx(task, xxx)			\
({							\
	__typeof__(((struct cred *)NULL)->xxx) ___val;	\
	rcu_read_lock();				\
	___val = __task_cred((task))->xxx;		\
	rcu_read_unlock();				\
	___val;						\
})

#define task_uid(task)		(task_cred_xxx((task), uid))
#define task_euid(task)		(task_cred_xxx((task), euid))

#define current_cred_xxx(xxx)			\
({						\
	current_cred()->xxx;			\
})

#define current_uid()		(current_cred_xxx(uid))
#define current_gid()		(current_cred_xxx(gid))
#define current_euid()		(current_cred_xxx(euid))
#define current_egid()		(current_cred_xxx(egid))
#define current_suid()		(current_cred_xxx(suid))
#define current_sgid()		(current_cred_xxx(sgid))
#define current_fsuid() 	(current_cred_xxx(fsuid))
#define current_fsgid() 	(current_cred_xxx(fsgid))
#define current_cap()		(current_cred_xxx(cap_effective))
#define current_user()		(current_cred_xxx(user))
#define current_security()	(current_cred_xxx(security))

extern struct user_namespace init_user_ns;
#ifdef CONFIG_USER_NS
#define current_user_ns()	(current_cred_xxx(user_ns))
#else
#define current_user_ns()	(&init_user_ns)
#endif


#define current_uid_gid(_uid, _gid)		\
do {						\
	const struct cred *__cred;		\
	__cred = current_cred();		\
	*(_uid) = __cred->uid;			\
	*(_gid) = __cred->gid;			\
} while(0)

#define current_euid_egid(_euid, _egid)		\
do {						\
	const struct cred *__cred;		\
	__cred = current_cred();		\
	*(_euid) = __cred->euid;		\
	*(_egid) = __cred->egid;		\
} while(0)

#define current_fsuid_fsgid(_fsuid, _fsgid)	\
do {						\
	const struct cred *__cred;		\
	__cred = current_cred();		\
	*(_fsuid) = __cred->fsuid;		\
	*(_fsgid) = __cred->fsgid;		\
} while(0)

#endif /* _LINUX_CRED_H */
Commit	Line	Data
d410fa4e	1	/* Credentials management - see Documentation/security/credentials.txt
9e2b2dc4 DH	2	*
	3	* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#ifndef _LINUX_CRED_H
	13	#define _LINUX_CRED_H
	14
b6dff3ec	15	#include <linux/capability.h>
b2e1feaf	16	#include <linux/init.h>
b6dff3ec	17	#include <linux/key.h>
ed868a56	18	#include <linux/selinux.h>
60063497	19	#include <linux/atomic.h>
ae2975bc	20	#include <linux/uidgid.h>
b6dff3ec DH	21
	22	struct user_struct;
	23	struct cred;
3a3b7ce9	24	struct inode;
b6dff3ec DH	25
	26	/*
	27	* COW Supplementary groups list
	28	*/
	29	#define NGROUPS_SMALL 32
ae2975bc	30	#define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(kgid_t)))
b6dff3ec DH	31
	32	struct group_info {
	33	atomic_t usage;
	34	int ngroups;
	35	int nblocks;
ae2975bc EB	36	kgid_t small_block[NGROUPS_SMALL];
ae2975bc EB	37	kgid_t *blocks[0];
b6dff3ec DH	38	};
	39
	40	/**
	41	* get_group_info - Get a reference to a group info structure
	42	* @group_info: The group info to reference
	43	*
86a264ab DH	44	* This gets a reference to a set of supplementary groups.
	45	*
	46	* If the caller is accessing a task's credentials, they must hold the RCU read
	47	* lock when reading.
b6dff3ec	48	*/
86a264ab DH	49	static inline struct group_info get_group_info(struct group_info gi)
	50	{
	51	atomic_inc(&gi->usage);
	52	return gi;
	53	}
b6dff3ec DH	54
	55	/**
	56	* put_group_info - Release a reference to a group info structure
	57	* @group_info: The group info to release
	58	*/
	59	#define put_group_info(group_info) \
	60	do { \
	61	if (atomic_dec_and_test(&(group_info)->usage)) \
	62	groups_free(group_info); \
	63	} while (0)
	64
18b6e041	65	extern struct group_info init_groups;
2813893f IM	66	#ifdef CONFIG_MULTIUSER
2813893f IM	67	extern struct group_info *groups_alloc(int);
b6dff3ec	68	extern void groups_free(struct group_info *);
2813893f IM	69
	70	extern int in_group_p(kgid_t);
	71	extern int in_egroup_p(kgid_t);
	72	#else
	73	static inline void groups_free(struct group_info *group_info)
	74	{
	75	}
	76
	77	static inline int in_group_p(kgid_t grp)
	78	{
	79	return 1;
	80	}
	81	static inline int in_egroup_p(kgid_t grp)
	82	{
	83	return 1;
	84	}
	85	#endif
b6dff3ec	86	extern int set_current_groups(struct group_info *);
8f6c5ffc	87	extern void set_groups(struct cred , struct group_info );
ae2975bc	88	extern int groups_search(const struct group_info *, kgid_t);
7ff4d90b	89	extern bool may_setgroups(void);
b6dff3ec DH	90
	91	/* access the groups "array" with this macro */
	92	#define GROUP_AT(gi, i) \
	93	((gi)->blocks[(i) / NGROUPS_PER_BLOCK][(i) % NGROUPS_PER_BLOCK])
	94
b6dff3ec DH	95	/*
	96	* The security context of a task
	97	*
	98	* The parts of the context break down into two categories:
	99	*
	100	* (1) The objective context of a task. These parts are used when some other
	101	* task is attempting to affect this one.
	102	*
	103	* (2) The subjective context. These details are used when the task is acting
	104	* upon another object, be that a file, a task, a key or whatever.
	105	*
	106	* Note that some members of this structure belong to both categories - the
	107	* LSM security pointer for instance.
	108	*
	109	* A task has two security pointers. task->real_cred points to the objective
	110	* context that defines that task's actual details. The objective part of this
	111	* context is used whenever that task is acted upon.
	112	*
	113	* task->cred points to the subjective context that defines the details of how
	114	* that task is going to act upon another object. This may be overridden
	115	* temporarily to point to another security context, but normally points to the
	116	* same context as task->real_cred.
	117	*/
	118	struct cred {
	119	atomic_t usage;
e0e81739 DH	120	#ifdef CONFIG_DEBUG_CREDENTIALS
	121	atomic_t subscribers; /* number of processes subscribed */
	122	void *put_addr;
	123	unsigned magic;
	124	#define CRED_MAGIC 0x43736564
	125	#define CRED_MAGIC_DEAD 0x44656144
	126	#endif
078de5f7 EB	127	kuid_t uid; /* real UID of the task */
	128	kgid_t gid; /* real GID of the task */
	129	kuid_t suid; /* saved UID of the task */
	130	kgid_t sgid; /* saved GID of the task */
	131	kuid_t euid; /* effective UID of the task */
	132	kgid_t egid; /* effective GID of the task */
	133	kuid_t fsuid; /* UID for VFS ops */
	134	kgid_t fsgid; /* GID for VFS ops */
b6dff3ec DH	135	unsigned securebits; /* SUID-less security management */
	136	kernel_cap_t cap_inheritable; /* caps our children can inherit */
	137	kernel_cap_t cap_permitted; /* caps we're permitted */
	138	kernel_cap_t cap_effective; /* caps we can actually use */
	139	kernel_cap_t cap_bset; /* capability bounding set */
	140	#ifdef CONFIG_KEYS
	141	unsigned char jit_keyring; /* default keyring to attach requested
	142	* keys to */
3a50597d DH	143	struct key __rcu session_keyring; / keyring inherited over fork */
3a50597d DH	144	struct key process_keyring; / keyring private to this process */
b6dff3ec DH	145	struct key thread_keyring; / keyring private to this thread */
	146	struct key request_key_auth; / assumed request_key authority */
	147	#endif
	148	#ifdef CONFIG_SECURITY
	149	void security; / subjective LSM security */
	150	#endif
	151	struct user_struct user; / real user ID subscription */
0093ccb6	152	struct user_namespace user_ns; / user_ns the caps and keyrings are relative to. */
b6dff3ec DH	153	struct group_info group_info; / supplementary groups for euid/fsgid */
b6dff3ec DH	154	struct rcu_head rcu; /* RCU deletion hook */
b6dff3ec DH	155	};
b6dff3ec DH	156
f1752eec	157	extern void __put_cred(struct cred *);
e0e81739	158	extern void exit_creds(struct task_struct *);
f1752eec	159	extern int copy_creds(struct task_struct *, unsigned long);
de09a977	160	extern const struct cred get_task_cred(struct task_struct );
ee18d64c	161	extern struct cred *cred_alloc_blank(void);
d84f4f99	162	extern struct cred *prepare_creds(void);
a6f76f23	163	extern struct cred *prepare_exec_creds(void);
d84f4f99 DH	164	extern int commit_creds(struct cred *);
d84f4f99 DH	165	extern void abort_creds(struct cred *);
3b11a1de DH	166	extern const struct cred override_creds(const struct cred );
3b11a1de DH	167	extern void revert_creds(const struct cred *);
3a3b7ce9 DH	168	extern struct cred prepare_kernel_cred(struct task_struct );
	169	extern int change_create_files_as(struct cred , struct inode );
	170	extern int set_security_override(struct cred *, u32);
	171	extern int set_security_override_from_ctx(struct cred , const char );
	172	extern int set_create_files_as(struct cred , struct inode );
d84f4f99 DH	173	extern void __init cred_init(void);
d84f4f99 DH	174
e0e81739 DH	175	/*
	176	* check for validity of credentials
	177	*/
	178	#ifdef CONFIG_DEBUG_CREDENTIALS
	179	extern void __invalid_creds(const struct cred , const char , unsigned);
	180	extern void __validate_process_creds(struct task_struct *,
	181	const char *, unsigned);
	182
74908a00	183	extern bool creds_are_invalid(const struct cred *cred);
e0e81739 DH	184
	185	static inline void __validate_creds(const struct cred *cred,
	186	const char *file, unsigned line)
	187	{
	188	if (unlikely(creds_are_invalid(cred)))
	189	__invalid_creds(cred, file, line);
	190	}
	191
	192	#define validate_creds(cred) \
	193	do { \
	194	__validate_creds((cred), __FILE__, __LINE__); \
	195	} while(0)
	196
	197	#define validate_process_creds() \
	198	do { \
	199	__validate_process_creds(current, __FILE__, __LINE__); \
	200	} while(0)
	201
	202	extern void validate_creds_for_do_exit(struct task_struct *);
	203	#else
	204	static inline void validate_creds(const struct cred *cred)
	205	{
	206	}
	207	static inline void validate_creds_for_do_exit(struct task_struct *tsk)
	208	{
	209	}
	210	static inline void validate_process_creds(void)
	211	{
	212	}
	213	#endif
	214
d84f4f99 DH	215	/**
	216	* get_new_cred - Get a reference on a new set of credentials
	217	* @cred: The new credentials to reference
	218	*
	219	* Get a reference on the specified set of new credentials. The caller must
	220	* release the reference.
	221	*/
	222	static inline struct cred get_new_cred(struct cred cred)
	223	{
	224	atomic_inc(&cred->usage);
	225	return cred;
	226	}
f1752eec DH	227
	228	/**
	229	* get_cred - Get a reference on a set of credentials
	230	* @cred: The credentials to reference
	231	*
	232	* Get a reference on the specified set of credentials. The caller must
	233	* release the reference.
98870ab0 DH	234	*
	235	* This is used to deal with a committed set of credentials. Although the
	236	* pointer is const, this will temporarily discard the const and increment the
	237	* usage count. The purpose of this is to attempt to catch at compile time the
	238	* accidental alteration of a set of credentials that should be considered
	239	* immutable.
f1752eec	240	*/
d84f4f99	241	static inline const struct cred get_cred(const struct cred cred)
f1752eec	242	{
1c388ad0	243	struct cred nonconst_cred = (struct cred ) cred;
e0e81739	244	validate_creds(cred);
1c388ad0	245	return get_new_cred(nonconst_cred);
f1752eec DH	246	}
	247
	248	/**
	249	* put_cred - Release a reference to a set of credentials
	250	* @cred: The credentials to release
	251	*
	252	* Release a reference to a set of credentials, deleting them when the last ref
	253	* is released.
98870ab0 DH	254	*
	255	* This takes a const pointer to a set of credentials because the credentials
	256	* on task_struct are attached by const pointers to prevent accidental
	257	* alteration of otherwise immutable credential sets.
f1752eec	258	*/
c69e8d9c	259	static inline void put_cred(const struct cred *_cred)
f1752eec	260	{
c69e8d9c	261	struct cred cred = (struct cred ) _cred;
d84f4f99	262
e0e81739	263	validate_creds(cred);
f1752eec DH	264	if (atomic_dec_and_test(&(cred)->usage))
	265	__put_cred(cred);
	266	}
	267
86a264ab	268	/**
3b11a1de	269	* current_cred - Access the current task's subjective credentials
86a264ab	270	*
32955148 AV	271	* Access the subjective credentials of the current task. RCU-safe,
32955148 AV	272	* since nobody else can modify it.
86a264ab DH	273	*/
86a264ab DH	274	#define current_cred() \
27e4e436	275	rcu_dereference_protected(current->cred, 1)
86a264ab	276
ae4b884f JL	277	/**
	278	* current_real_cred - Access the current task's objective credentials
	279	*
	280	* Access the objective credentials of the current task. RCU-safe,
	281	* since nobody else can modify it.
	282	*/
	283	#define current_real_cred() \
	284	rcu_dereference_protected(current->real_cred, 1)
	285
86a264ab	286	/**
3b11a1de	287	* __task_cred - Access a task's objective credentials
86a264ab DH	288	* @task: The task to query
86a264ab DH	289	*
3b11a1de	290	* Access the objective credentials of a task. The caller must hold the RCU
43e13cc1	291	* readlock.
86a264ab	292	*
8f92054e DH	293	* The result of this function should not be passed directly to get_cred();
8f92054e DH	294	* rather get_task_cred() should be used instead.
86a264ab	295	*/
43e13cc1 ON	296	#define __task_cred(task) \
43e13cc1 ON	297	rcu_dereference((task)->real_cred)
86a264ab	298
86a264ab	299	/**
3b11a1de	300	* get_current_cred - Get the current task's subjective credentials
86a264ab	301	*
3b11a1de DH	302	* Get the subjective credentials of the current task, pinning them so that
	303	* they can't go away. Accessing the current task's credentials directly is
	304	* not permitted.
86a264ab DH	305	*/
	306	#define get_current_cred() \
	307	(get_cred(current_cred()))
	308
	309	/**
	310	* get_current_user - Get the current task's user_struct
	311	*
	312	* Get the user record of the current task, pinning it so that it can't go
	313	* away.
	314	*/
	315	#define get_current_user() \
	316	({ \
	317	struct user_struct *__u; \
638a8439	318	const struct cred *__cred; \
32955148	319	__cred = current_cred(); \
86a264ab DH	320	__u = get_uid(__cred->user); \
	321	__u; \
	322	})
	323
	324	/**
	325	* get_current_groups - Get the current task's supplementary group list
	326	*
	327	* Get the supplementary group list of the current task, pinning it so that it
	328	* can't go away.
	329	*/
	330	#define get_current_groups() \
	331	({ \
	332	struct group_info *__groups; \
638a8439	333	const struct cred *__cred; \
32955148	334	__cred = current_cred(); \
86a264ab DH	335	__groups = get_group_info(__cred->group_info); \
	336	__groups; \
	337	})
	338
d84f4f99 DH	339	#define task_cred_xxx(task, xxx) \
	340	({ \
	341	__typeof__(((struct cred *)NULL)->xxx) ___val; \
	342	rcu_read_lock(); \
	343	___val = __task_cred((task))->xxx; \
	344	rcu_read_unlock(); \
	345	___val; \
86a264ab DH	346	})
	347
	348	#define task_uid(task) (task_cred_xxx((task), uid))
	349	#define task_euid(task) (task_cred_xxx((task), euid))
	350
	351	#define current_cred_xxx(xxx) \
	352	({ \
32955148	353	current_cred()->xxx; \
86a264ab DH	354	})
	355
	356	#define current_uid() (current_cred_xxx(uid))
	357	#define current_gid() (current_cred_xxx(gid))
	358	#define current_euid() (current_cred_xxx(euid))
	359	#define current_egid() (current_cred_xxx(egid))
	360	#define current_suid() (current_cred_xxx(suid))
	361	#define current_sgid() (current_cred_xxx(sgid))
	362	#define current_fsuid() (current_cred_xxx(fsuid))
	363	#define current_fsgid() (current_cred_xxx(fsgid))
	364	#define current_cap() (current_cred_xxx(cap_effective))
	365	#define current_user() (current_cred_xxx(user))
	366	#define current_security() (current_cred_xxx(security))
	367
7e6bd8fa	368	extern struct user_namespace init_user_ns;
47a150ed	369	#ifdef CONFIG_USER_NS
f1c84dae	370	#define current_user_ns() (current_cred_xxx(user_ns))
47a150ed	371	#else
f1c84dae	372	#define current_user_ns() (&init_user_ns)
47a150ed SH	373	#endif
47a150ed SH	374
3486740a	375
86a264ab DH	376	#define current_uid_gid(_uid, _gid) \
	377	do { \
	378	const struct cred *__cred; \
	379	__cred = current_cred(); \
	380	*(_uid) = __cred->uid; \
	381	*(_gid) = __cred->gid; \
	382	} while(0)
	383
	384	#define current_euid_egid(_euid, _egid) \
	385	do { \
	386	const struct cred *__cred; \
	387	__cred = current_cred(); \
	388	*(_euid) = __cred->euid; \
	389	*(_egid) = __cred->egid; \
	390	} while(0)
	391
	392	#define current_fsuid_fsgid(_fsuid, _fsgid) \
	393	do { \
	394	const struct cred *__cred; \
	395	__cred = current_cred(); \
	396	*(_fsuid) = __cred->fsuid; \
	397	*(_fsgid) = __cred->fsgid; \
	398	} while(0)
	399
9e2b2dc4	400	#endif /* _LINUX_CRED_H */