[linux-2.6-block.git] / security / keys / proc.c

/* procfs files for key database enumeration
 *
 * Copyright (C) 2004 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 License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/errno.h>
#include "internal.h"

#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
static int proc_keys_open(struct inode *inode, struct file *file);
static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
static void proc_keys_stop(struct seq_file *p, void *v);
static int proc_keys_show(struct seq_file *m, void *v);

static const struct seq_operations proc_keys_ops = {
	.start	= proc_keys_start,
	.next	= proc_keys_next,
	.stop	= proc_keys_stop,
	.show	= proc_keys_show,
};

static const struct file_operations proc_keys_fops = {
	.open		= proc_keys_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif

static int proc_key_users_open(struct inode *inode, struct file *file);
static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
static void proc_key_users_stop(struct seq_file *p, void *v);
static int proc_key_users_show(struct seq_file *m, void *v);

static const struct seq_operations proc_key_users_ops = {
	.start	= proc_key_users_start,
	.next	= proc_key_users_next,
	.stop	= proc_key_users_stop,
	.show	= proc_key_users_show,
};

static const struct file_operations proc_key_users_fops = {
	.open		= proc_key_users_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*
 * Declare the /proc files.
 */
static int __init key_proc_init(void)
{
	struct proc_dir_entry *p;

#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
	p = proc_create("keys", 0, NULL, &proc_keys_fops);
	if (!p)
		panic("Cannot create /proc/keys\n");
#endif

	p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
	if (!p)
		panic("Cannot create /proc/key-users\n");

	return 0;
}

__initcall(key_proc_init);

/*
 * Implement "/proc/keys" to provide a list of the keys on the system that
 * grant View permission to the caller.
 */
#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS

static struct rb_node *key_serial_next(struct seq_file *p, struct rb_node *n)
{
	struct user_namespace *user_ns = seq_user_ns(p);

	n = rb_next(n);
	while (n) {
		struct key *key = rb_entry(n, struct key, serial_node);
		if (kuid_has_mapping(user_ns, key->user->uid))
			break;
		n = rb_next(n);
	}
	return n;
}

static int proc_keys_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &proc_keys_ops);
}

static struct key *find_ge_key(struct seq_file *p, key_serial_t id)
{
	struct user_namespace *user_ns = seq_user_ns(p);
	struct rb_node *n = key_serial_tree.rb_node;
	struct key *minkey = NULL;

	while (n) {
		struct key *key = rb_entry(n, struct key, serial_node);
		if (id < key->serial) {
			if (!minkey || minkey->serial > key->serial)
				minkey = key;
			n = n->rb_left;
		} else if (id > key->serial) {
			n = n->rb_right;
		} else {
			minkey = key;
			break;
		}
		key = NULL;
	}

	if (!minkey)
		return NULL;

	for (;;) {
		if (kuid_has_mapping(user_ns, minkey->user->uid))
			return minkey;
		n = rb_next(&minkey->serial_node);
		if (!n)
			return NULL;
		minkey = rb_entry(n, struct key, serial_node);
	}
}

static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
	__acquires(key_serial_lock)
{
	key_serial_t pos = *_pos;
	struct key *key;

	spin_lock(&key_serial_lock);

	if (*_pos > INT_MAX)
		return NULL;
	key = find_ge_key(p, pos);
	if (!key)
		return NULL;
	*_pos = key->serial;
	return &key->serial_node;
}

static inline key_serial_t key_node_serial(struct rb_node *n)
{
	struct key *key = rb_entry(n, struct key, serial_node);
	return key->serial;
}

static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
{
	struct rb_node *n;

	n = key_serial_next(p, v);
	if (n)
		*_pos = key_node_serial(n);
	return n;
}

static void proc_keys_stop(struct seq_file *p, void *v)
	__releases(key_serial_lock)
{
	spin_unlock(&key_serial_lock);
}

static int proc_keys_show(struct seq_file *m, void *v)
{
	struct rb_node *_p = v;
	struct key *key = rb_entry(_p, struct key, serial_node);
	struct timespec now;
	unsigned long timo;
	key_ref_t key_ref, skey_ref;
	char xbuf[12];
	int rc;

	struct keyring_search_context ctx = {
		.index_key.type		= key->type,
		.index_key.description	= key->description,
		.cred			= current_cred(),
		.match			= lookup_user_key_possessed,
		.match_data		= key,
		.flags			= (KEYRING_SEARCH_NO_STATE_CHECK |
					   KEYRING_SEARCH_LOOKUP_DIRECT),
	};

	key_ref = make_key_ref(key, 0);

	/* determine if the key is possessed by this process (a test we can
	 * skip if the key does not indicate the possessor can view it
	 */
	if (key->perm & KEY_POS_VIEW) {
		skey_ref = search_my_process_keyrings(&ctx);
		if (!IS_ERR(skey_ref)) {
			key_ref_put(skey_ref);
			key_ref = make_key_ref(key, 1);
		}
	}

	/* check whether the current task is allowed to view the key (assuming
	 * non-possession)
	 * - the caller holds a spinlock, and thus the RCU read lock, making our
	 *   access to __current_cred() safe
	 */
	rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW);
	if (rc < 0)
		return 0;

	now = current_kernel_time();

	rcu_read_lock();

	/* come up with a suitable timeout value */
	if (key->expiry == 0) {
		memcpy(xbuf, "perm", 5);
	} else if (now.tv_sec >= key->expiry) {
		memcpy(xbuf, "expd", 5);
	} else {
		timo = key->expiry - now.tv_sec;

		if (timo < 60)
			sprintf(xbuf, "%lus", timo);
		else if (timo < 60*60)
			sprintf(xbuf, "%lum", timo / 60);
		else if (timo < 60*60*24)
			sprintf(xbuf, "%luh", timo / (60*60));
		else if (timo < 60*60*24*7)
			sprintf(xbuf, "%lud", timo / (60*60*24));
		else
			sprintf(xbuf, "%luw", timo / (60*60*24*7));
	}

#define showflag(KEY, LETTER, FLAG) \
	(test_bit(FLAG,	&(KEY)->flags) ? LETTER : '-')

	seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
		   key->serial,
		   showflag(key, 'I', KEY_FLAG_INSTANTIATED),
		   showflag(key, 'R', KEY_FLAG_REVOKED),
		   showflag(key, 'D', KEY_FLAG_DEAD),
		   showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
		   showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
		   showflag(key, 'N', KEY_FLAG_NEGATIVE),
		   showflag(key, 'i', KEY_FLAG_INVALIDATED),
		   atomic_read(&key->usage),
		   xbuf,
		   key->perm,
		   from_kuid_munged(seq_user_ns(m), key->uid),
		   from_kgid_munged(seq_user_ns(m), key->gid),
		   key->type->name);

#undef showflag

	if (key->type->describe)
		key->type->describe(key, m);
	seq_putc(m, '\n');

	rcu_read_unlock();
	return 0;
}

#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */

static struct rb_node *__key_user_next(struct user_namespace *user_ns, struct rb_node *n)
{
	while (n) {
		struct key_user *user = rb_entry(n, struct key_user, node);
		if (kuid_has_mapping(user_ns, user->uid))
			break;
		n = rb_next(n);
	}
	return n;
}

static struct rb_node *key_user_next(struct user_namespace *user_ns, struct rb_node *n)
{
	return __key_user_next(user_ns, rb_next(n));
}

static struct rb_node *key_user_first(struct user_namespace *user_ns, struct rb_root *r)
{
	struct rb_node *n = rb_first(r);
	return __key_user_next(user_ns, n);
}

/*
 * Implement "/proc/key-users" to provides a list of the key users and their
 * quotas.
 */
static int proc_key_users_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &proc_key_users_ops);
}

static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
	__acquires(key_user_lock)
{
	struct rb_node *_p;
	loff_t pos = *_pos;

	spin_lock(&key_user_lock);

	_p = key_user_first(seq_user_ns(p), &key_user_tree);
	while (pos > 0 && _p) {
		pos--;
		_p = key_user_next(seq_user_ns(p), _p);
	}

	return _p;
}

static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
{
	(*_pos)++;
	return key_user_next(seq_user_ns(p), (struct rb_node *)v);
}

static void proc_key_users_stop(struct seq_file *p, void *v)
	__releases(key_user_lock)
{
	spin_unlock(&key_user_lock);
}

static int proc_key_users_show(struct seq_file *m, void *v)
{
	struct rb_node *_p = v;
	struct key_user *user = rb_entry(_p, struct key_user, node);
	unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ?
		key_quota_root_maxkeys : key_quota_maxkeys;
	unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ?
		key_quota_root_maxbytes : key_quota_maxbytes;

	seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
		   from_kuid_munged(seq_user_ns(m), user->uid),
		   atomic_read(&user->usage),
		   atomic_read(&user->nkeys),
		   atomic_read(&user->nikeys),
		   user->qnkeys,
		   maxkeys,
		   user->qnbytes,
		   maxbytes);

	return 0;
}
Commit	Line	Data
973c9f4f	1	/* procfs files for key database enumeration
1da177e4 LT	2	*
	3	* Copyright (C) 2004 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 License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/sched.h>
1da177e4 LT	15	#include <linux/fs.h>
	16	#include <linux/proc_fs.h>
	17	#include <linux/seq_file.h>
	18	#include <asm/errno.h>
	19	#include "internal.h"
	20
	21	#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
	22	static int proc_keys_open(struct inode inode, struct file file);
	23	static void proc_keys_start(struct seq_file p, loff_t *_pos);
	24	static void proc_keys_next(struct seq_file p, void v, loff_t _pos);
	25	static void proc_keys_stop(struct seq_file p, void v);
	26	static int proc_keys_show(struct seq_file m, void v);
	27
1996a109	28	static const struct seq_operations proc_keys_ops = {
1da177e4 LT	29	.start = proc_keys_start,
	30	.next = proc_keys_next,
	31	.stop = proc_keys_stop,
	32	.show = proc_keys_show,
	33	};
	34
9c2e08c5	35	static const struct file_operations proc_keys_fops = {
1da177e4 LT	36	.open = proc_keys_open,
	37	.read = seq_read,
	38	.llseek = seq_lseek,
	39	.release = seq_release,
	40	};
	41	#endif
	42
	43	static int proc_key_users_open(struct inode inode, struct file file);
	44	static void proc_key_users_start(struct seq_file p, loff_t *_pos);
	45	static void proc_key_users_next(struct seq_file p, void v, loff_t _pos);
	46	static void proc_key_users_stop(struct seq_file p, void v);
	47	static int proc_key_users_show(struct seq_file m, void v);
	48
1996a109	49	static const struct seq_operations proc_key_users_ops = {
1da177e4 LT	50	.start = proc_key_users_start,
	51	.next = proc_key_users_next,
	52	.stop = proc_key_users_stop,
	53	.show = proc_key_users_show,
	54	};
	55
9c2e08c5	56	static const struct file_operations proc_key_users_fops = {
1da177e4 LT	57	.open = proc_key_users_open,
	58	.read = seq_read,
	59	.llseek = seq_lseek,
	60	.release = seq_release,
	61	};
	62
1da177e4	63	/*
973c9f4f	64	* Declare the /proc files.
1da177e4 LT	65	*/
	66	static int __init key_proc_init(void)
	67	{
	68	struct proc_dir_entry *p;
	69
	70	#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
da91d2ef	71	p = proc_create("keys", 0, NULL, &proc_keys_fops);
1da177e4 LT	72	if (!p)
1da177e4 LT	73	panic("Cannot create /proc/keys\n");
1da177e4 LT	74	#endif
1da177e4 LT	75
da91d2ef	76	p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
1da177e4 LT	77	if (!p)
	78	panic("Cannot create /proc/key-users\n");
	79
1da177e4	80	return 0;
a8b17ed0	81	}
1da177e4 LT	82
	83	__initcall(key_proc_init);
	84
1da177e4	85	/*
973c9f4f DH	86	* Implement "/proc/keys" to provide a list of the keys on the system that
973c9f4f DH	87	* grant View permission to the caller.
1da177e4 LT	88	*/
	89	#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
	90
9a56c2db	91	static struct rb_node key_serial_next(struct seq_file p, struct rb_node *n)
454804ab	92	{
9a56c2db	93	struct user_namespace *user_ns = seq_user_ns(p);
ad73a717 SH	94
ad73a717 SH	95	n = rb_next(n);
454804ab SH	96	while (n) {
454804ab SH	97	struct key *key = rb_entry(n, struct key, serial_node);
9a56c2db	98	if (kuid_has_mapping(user_ns, key->user->uid))
454804ab SH	99	break;
	100	n = rb_next(n);
	101	}
	102	return n;
	103	}
	104
ad73a717	105	static int proc_keys_open(struct inode inode, struct file file)
454804ab	106	{
ad73a717	107	return seq_open(file, &proc_keys_ops);
454804ab SH	108	}
454804ab SH	109
9a56c2db	110	static struct key find_ge_key(struct seq_file p, key_serial_t id)
454804ab	111	{
9a56c2db	112	struct user_namespace *user_ns = seq_user_ns(p);
ad73a717 SH	113	struct rb_node *n = key_serial_tree.rb_node;
ad73a717 SH	114	struct key *minkey = NULL;
454804ab	115
ad73a717 SH	116	while (n) {
	117	struct key *key = rb_entry(n, struct key, serial_node);
	118	if (id < key->serial) {
	119	if (!minkey \|\| minkey->serial > key->serial)
	120	minkey = key;
	121	n = n->rb_left;
	122	} else if (id > key->serial) {
	123	n = n->rb_right;
	124	} else {
	125	minkey = key;
	126	break;
	127	}
	128	key = NULL;
	129	}
1da177e4	130
ad73a717 SH	131	if (!minkey)
	132	return NULL;
	133
	134	for (;;) {
9a56c2db	135	if (kuid_has_mapping(user_ns, minkey->user->uid))
ad73a717 SH	136	return minkey;
	137	n = rb_next(&minkey->serial_node);
	138	if (!n)
	139	return NULL;
	140	minkey = rb_entry(n, struct key, serial_node);
	141	}
1da177e4 LT	142	}
	143
	144	static void proc_keys_start(struct seq_file p, loff_t *_pos)
86abcf9c	145	__acquires(key_serial_lock)
1da177e4	146	{
ad73a717 SH	147	key_serial_t pos = *_pos;
ad73a717 SH	148	struct key *key;
1da177e4 LT	149
	150	spin_lock(&key_serial_lock);
	151
ad73a717 SH	152	if (*_pos > INT_MAX)
ad73a717 SH	153	return NULL;
9a56c2db	154	key = find_ge_key(p, pos);
ad73a717 SH	155	if (!key)
	156	return NULL;
	157	*_pos = key->serial;
	158	return &key->serial_node;
	159	}
1da177e4	160
ad73a717 SH	161	static inline key_serial_t key_node_serial(struct rb_node *n)
	162	{
	163	struct key *key = rb_entry(n, struct key, serial_node);
	164	return key->serial;
1da177e4 LT	165	}
	166
	167	static void proc_keys_next(struct seq_file p, void v, loff_t _pos)
	168	{
ad73a717	169	struct rb_node *n;
1da177e4	170
9a56c2db	171	n = key_serial_next(p, v);
ad73a717 SH	172	if (n)
	173	*_pos = key_node_serial(n);
	174	return n;
1da177e4 LT	175	}
	176
	177	static void proc_keys_stop(struct seq_file p, void v)
86abcf9c	178	__releases(key_serial_lock)
1da177e4 LT	179	{
	180	spin_unlock(&key_serial_lock);
	181	}
	182
	183	static int proc_keys_show(struct seq_file m, void v)
	184	{
	185	struct rb_node *_p = v;
	186	struct key *key = rb_entry(_p, struct key, serial_node);
	187	struct timespec now;
	188	unsigned long timo;
927942aa	189	key_ref_t key_ref, skey_ref;
1da177e4	190	char xbuf[12];
06ec7be5 ML	191	int rc;
06ec7be5 ML	192
4bdf0bc3 DH	193	struct keyring_search_context ctx = {
	194	.index_key.type = key->type,
	195	.index_key.description = key->description,
	196	.cred = current_cred(),
	197	.match = lookup_user_key_possessed,
	198	.match_data = key,
	199	.flags = (KEYRING_SEARCH_NO_STATE_CHECK \|
	200	KEYRING_SEARCH_LOOKUP_DIRECT),
	201	};
	202
927942aa DH	203	key_ref = make_key_ref(key, 0);
	204
	205	/* determine if the key is possessed by this process (a test we can
	206	* skip if the key does not indicate the possessor can view it
	207	*/
	208	if (key->perm & KEY_POS_VIEW) {
4bdf0bc3	209	skey_ref = search_my_process_keyrings(&ctx);
927942aa DH	210	if (!IS_ERR(skey_ref)) {
	211	key_ref_put(skey_ref);
	212	key_ref = make_key_ref(key, 1);
	213	}
	214	}
	215
06ec7be5	216	/* check whether the current task is allowed to view the key (assuming
d84f4f99 DH	217	* non-possession)
	218	* - the caller holds a spinlock, and thus the RCU read lock, making our
	219	* access to __current_cred() safe
	220	*/
f5895943	221	rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW);
06ec7be5 ML	222	if (rc < 0)
06ec7be5 ML	223	return 0;
1da177e4 LT	224
	225	now = current_kernel_time();
	226
76d8aeab	227	rcu_read_lock();
1da177e4 LT	228
	229	/* come up with a suitable timeout value */
	230	if (key->expiry == 0) {
	231	memcpy(xbuf, "perm", 5);
7b1b9164	232	} else if (now.tv_sec >= key->expiry) {
1da177e4	233	memcpy(xbuf, "expd", 5);
7b1b9164	234	} else {
1da177e4 LT	235	timo = key->expiry - now.tv_sec;
	236
	237	if (timo < 60)
	238	sprintf(xbuf, "%lus", timo);
	239	else if (timo < 60*60)
	240	sprintf(xbuf, "%lum", timo / 60);
	241	else if (timo < 606024)
	242	sprintf(xbuf, "%luh", timo / (60*60));
	243	else if (timo < 606024*7)
	244	sprintf(xbuf, "%lud", timo / (606024));
	245	else
	246	sprintf(xbuf, "%luw", timo / (606024*7));
	247	}
	248
76d8aeab DH	249	#define showflag(KEY, LETTER, FLAG) \
	250	(test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
	251
fd75815f	252	seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
1da177e4	253	key->serial,
76d8aeab DH	254	showflag(key, 'I', KEY_FLAG_INSTANTIATED),
	255	showflag(key, 'R', KEY_FLAG_REVOKED),
	256	showflag(key, 'D', KEY_FLAG_DEAD),
	257	showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
	258	showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
	259	showflag(key, 'N', KEY_FLAG_NEGATIVE),
fd75815f	260	showflag(key, 'i', KEY_FLAG_INVALIDATED),
1da177e4 LT	261	atomic_read(&key->usage),
	262	xbuf,
	263	key->perm,
9a56c2db EB	264	from_kuid_munged(seq_user_ns(m), key->uid),
9a56c2db EB	265	from_kgid_munged(seq_user_ns(m), key->gid),
1da177e4 LT	266	key->type->name);
1da177e4 LT	267
76d8aeab DH	268	#undef showflag
76d8aeab DH	269
1da177e4 LT	270	if (key->type->describe)
	271	key->type->describe(key, m);
	272	seq_putc(m, '\n');
	273
76d8aeab	274	rcu_read_unlock();
1da177e4	275	return 0;
1da177e4 LT	276	}
	277
	278	#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
	279
9a56c2db	280	static struct rb_node __key_user_next(struct user_namespace user_ns, struct rb_node *n)
454804ab SH	281	{
	282	while (n) {
	283	struct key_user *user = rb_entry(n, struct key_user, node);
9a56c2db	284	if (kuid_has_mapping(user_ns, user->uid))
454804ab SH	285	break;
	286	n = rb_next(n);
	287	}
	288	return n;
	289	}
	290
9a56c2db	291	static struct rb_node key_user_next(struct user_namespace user_ns, struct rb_node *n)
454804ab	292	{
9a56c2db	293	return __key_user_next(user_ns, rb_next(n));
454804ab SH	294	}
454804ab SH	295
9a56c2db	296	static struct rb_node key_user_first(struct user_namespace user_ns, struct rb_root *r)
454804ab SH	297	{
454804ab SH	298	struct rb_node *n = rb_first(r);
9a56c2db	299	return __key_user_next(user_ns, n);
454804ab	300	}
7b1b9164	301
1da177e4	302	/*
973c9f4f DH	303	* Implement "/proc/key-users" to provides a list of the key users and their
973c9f4f DH	304	* quotas.
1da177e4 LT	305	*/
	306	static int proc_key_users_open(struct inode inode, struct file file)
	307	{
	308	return seq_open(file, &proc_key_users_ops);
1da177e4 LT	309	}
	310
	311	static void proc_key_users_start(struct seq_file p, loff_t *_pos)
86abcf9c	312	__acquires(key_user_lock)
1da177e4 LT	313	{
	314	struct rb_node *_p;
	315	loff_t pos = *_pos;
	316
	317	spin_lock(&key_user_lock);
	318
9a56c2db	319	_p = key_user_first(seq_user_ns(p), &key_user_tree);
1da177e4 LT	320	while (pos > 0 && _p) {
1da177e4 LT	321	pos--;
9a56c2db	322	_p = key_user_next(seq_user_ns(p), _p);
1da177e4 LT	323	}
	324
	325	return _p;
1da177e4 LT	326	}
	327
	328	static void proc_key_users_next(struct seq_file p, void v, loff_t _pos)
	329	{
	330	(*_pos)++;
9a56c2db	331	return key_user_next(seq_user_ns(p), (struct rb_node *)v);
1da177e4 LT	332	}
	333
	334	static void proc_key_users_stop(struct seq_file p, void v)
86abcf9c	335	__releases(key_user_lock)
1da177e4 LT	336	{
	337	spin_unlock(&key_user_lock);
	338	}
	339
	340	static int proc_key_users_show(struct seq_file m, void v)
	341	{
	342	struct rb_node *_p = v;
	343	struct key_user *user = rb_entry(_p, struct key_user, node);
9a56c2db	344	unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ?
0b77f5bf	345	key_quota_root_maxkeys : key_quota_maxkeys;
9a56c2db	346	unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ?
0b77f5bf	347	key_quota_root_maxbytes : key_quota_maxbytes;
1da177e4 LT	348
1da177e4 LT	349	seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
9a56c2db	350	from_kuid_munged(seq_user_ns(m), user->uid),
1da177e4 LT	351	atomic_read(&user->usage),
	352	atomic_read(&user->nkeys),
	353	atomic_read(&user->nikeys),
	354	user->qnkeys,
0b77f5bf	355	maxkeys,
1da177e4	356	user->qnbytes,
0b77f5bf	357	maxbytes);
1da177e4 LT	358
1da177e4 LT	359	return 0;
1da177e4	360	}