forked from Minki/linux
462919591a
Preparse the match data. This provides several advantages: (1) The preparser can reject invalid criteria up front. (2) The preparser can convert the criteria to binary data if necessary (the asymmetric key type really wants to do binary comparison of the key IDs). (3) The preparser can set the type of search to be performed. This means that it's not then a one-off setting in the key type. (4) The preparser can set an appropriate comparator function. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Vivek Goyal <vgoyal@redhat.com>
361 lines
8.9 KiB
C
361 lines
8.9 KiB
C
/* procfs files for key database enumeration
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/errno.h>
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#include "internal.h"
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#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
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static int proc_keys_open(struct inode *inode, struct file *file);
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static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
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static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
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static void proc_keys_stop(struct seq_file *p, void *v);
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static int proc_keys_show(struct seq_file *m, void *v);
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static const struct seq_operations proc_keys_ops = {
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.start = proc_keys_start,
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.next = proc_keys_next,
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.stop = proc_keys_stop,
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.show = proc_keys_show,
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};
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static const struct file_operations proc_keys_fops = {
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.open = proc_keys_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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static int proc_key_users_open(struct inode *inode, struct file *file);
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static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
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static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
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static void proc_key_users_stop(struct seq_file *p, void *v);
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static int proc_key_users_show(struct seq_file *m, void *v);
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static const struct seq_operations proc_key_users_ops = {
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.start = proc_key_users_start,
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.next = proc_key_users_next,
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.stop = proc_key_users_stop,
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.show = proc_key_users_show,
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};
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static const struct file_operations proc_key_users_fops = {
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.open = proc_key_users_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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/*
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* Declare the /proc files.
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*/
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static int __init key_proc_init(void)
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{
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struct proc_dir_entry *p;
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#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
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p = proc_create("keys", 0, NULL, &proc_keys_fops);
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if (!p)
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panic("Cannot create /proc/keys\n");
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#endif
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p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
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if (!p)
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panic("Cannot create /proc/key-users\n");
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return 0;
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}
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__initcall(key_proc_init);
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/*
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* Implement "/proc/keys" to provide a list of the keys on the system that
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* grant View permission to the caller.
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*/
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#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
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static struct rb_node *key_serial_next(struct seq_file *p, struct rb_node *n)
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{
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struct user_namespace *user_ns = seq_user_ns(p);
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n = rb_next(n);
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while (n) {
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struct key *key = rb_entry(n, struct key, serial_node);
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if (kuid_has_mapping(user_ns, key->user->uid))
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break;
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n = rb_next(n);
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}
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return n;
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}
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static int proc_keys_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &proc_keys_ops);
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}
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static struct key *find_ge_key(struct seq_file *p, key_serial_t id)
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{
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struct user_namespace *user_ns = seq_user_ns(p);
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struct rb_node *n = key_serial_tree.rb_node;
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struct key *minkey = NULL;
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while (n) {
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struct key *key = rb_entry(n, struct key, serial_node);
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if (id < key->serial) {
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if (!minkey || minkey->serial > key->serial)
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minkey = key;
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n = n->rb_left;
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} else if (id > key->serial) {
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n = n->rb_right;
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} else {
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minkey = key;
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break;
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}
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key = NULL;
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}
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if (!minkey)
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return NULL;
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for (;;) {
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if (kuid_has_mapping(user_ns, minkey->user->uid))
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return minkey;
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n = rb_next(&minkey->serial_node);
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if (!n)
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return NULL;
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minkey = rb_entry(n, struct key, serial_node);
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}
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}
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static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
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__acquires(key_serial_lock)
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{
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key_serial_t pos = *_pos;
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struct key *key;
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spin_lock(&key_serial_lock);
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if (*_pos > INT_MAX)
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return NULL;
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key = find_ge_key(p, pos);
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if (!key)
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return NULL;
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*_pos = key->serial;
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return &key->serial_node;
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}
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static inline key_serial_t key_node_serial(struct rb_node *n)
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{
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struct key *key = rb_entry(n, struct key, serial_node);
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return key->serial;
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}
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static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
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{
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struct rb_node *n;
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n = key_serial_next(p, v);
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if (n)
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*_pos = key_node_serial(n);
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return n;
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}
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static void proc_keys_stop(struct seq_file *p, void *v)
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__releases(key_serial_lock)
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{
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spin_unlock(&key_serial_lock);
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}
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static int proc_keys_show(struct seq_file *m, void *v)
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{
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struct rb_node *_p = v;
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struct key *key = rb_entry(_p, struct key, serial_node);
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struct timespec now;
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unsigned long timo;
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key_ref_t key_ref, skey_ref;
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char xbuf[12];
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int rc;
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struct keyring_search_context ctx = {
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.index_key.type = key->type,
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.index_key.description = key->description,
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.cred = current_cred(),
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.match_data.cmp = lookup_user_key_possessed,
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.match_data.raw_data = key,
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.match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
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.flags = KEYRING_SEARCH_NO_STATE_CHECK,
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};
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key_ref = make_key_ref(key, 0);
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/* determine if the key is possessed by this process (a test we can
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* skip if the key does not indicate the possessor can view it
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*/
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if (key->perm & KEY_POS_VIEW) {
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skey_ref = search_my_process_keyrings(&ctx);
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if (!IS_ERR(skey_ref)) {
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key_ref_put(skey_ref);
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key_ref = make_key_ref(key, 1);
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}
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}
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/* check whether the current task is allowed to view the key (assuming
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* non-possession)
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* - the caller holds a spinlock, and thus the RCU read lock, making our
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* access to __current_cred() safe
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*/
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rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW);
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if (rc < 0)
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return 0;
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now = current_kernel_time();
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rcu_read_lock();
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/* come up with a suitable timeout value */
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if (key->expiry == 0) {
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memcpy(xbuf, "perm", 5);
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} else if (now.tv_sec >= key->expiry) {
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memcpy(xbuf, "expd", 5);
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} else {
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timo = key->expiry - now.tv_sec;
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if (timo < 60)
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sprintf(xbuf, "%lus", timo);
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else if (timo < 60*60)
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sprintf(xbuf, "%lum", timo / 60);
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else if (timo < 60*60*24)
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sprintf(xbuf, "%luh", timo / (60*60));
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else if (timo < 60*60*24*7)
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sprintf(xbuf, "%lud", timo / (60*60*24));
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else
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sprintf(xbuf, "%luw", timo / (60*60*24*7));
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}
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#define showflag(KEY, LETTER, FLAG) \
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(test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
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seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
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key->serial,
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showflag(key, 'I', KEY_FLAG_INSTANTIATED),
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showflag(key, 'R', KEY_FLAG_REVOKED),
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showflag(key, 'D', KEY_FLAG_DEAD),
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showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
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showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
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showflag(key, 'N', KEY_FLAG_NEGATIVE),
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showflag(key, 'i', KEY_FLAG_INVALIDATED),
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atomic_read(&key->usage),
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xbuf,
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key->perm,
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from_kuid_munged(seq_user_ns(m), key->uid),
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from_kgid_munged(seq_user_ns(m), key->gid),
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key->type->name);
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#undef showflag
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if (key->type->describe)
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key->type->describe(key, m);
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seq_putc(m, '\n');
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rcu_read_unlock();
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return 0;
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}
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#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
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static struct rb_node *__key_user_next(struct user_namespace *user_ns, struct rb_node *n)
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{
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while (n) {
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struct key_user *user = rb_entry(n, struct key_user, node);
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if (kuid_has_mapping(user_ns, user->uid))
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break;
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n = rb_next(n);
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}
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return n;
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}
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static struct rb_node *key_user_next(struct user_namespace *user_ns, struct rb_node *n)
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{
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return __key_user_next(user_ns, rb_next(n));
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}
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static struct rb_node *key_user_first(struct user_namespace *user_ns, struct rb_root *r)
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{
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struct rb_node *n = rb_first(r);
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return __key_user_next(user_ns, n);
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}
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/*
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* Implement "/proc/key-users" to provides a list of the key users and their
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* quotas.
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*/
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static int proc_key_users_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &proc_key_users_ops);
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}
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static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
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__acquires(key_user_lock)
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{
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struct rb_node *_p;
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loff_t pos = *_pos;
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spin_lock(&key_user_lock);
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_p = key_user_first(seq_user_ns(p), &key_user_tree);
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while (pos > 0 && _p) {
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pos--;
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_p = key_user_next(seq_user_ns(p), _p);
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}
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return _p;
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}
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static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
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{
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(*_pos)++;
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return key_user_next(seq_user_ns(p), (struct rb_node *)v);
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}
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static void proc_key_users_stop(struct seq_file *p, void *v)
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__releases(key_user_lock)
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{
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spin_unlock(&key_user_lock);
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}
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static int proc_key_users_show(struct seq_file *m, void *v)
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{
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struct rb_node *_p = v;
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struct key_user *user = rb_entry(_p, struct key_user, node);
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unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ?
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key_quota_root_maxkeys : key_quota_maxkeys;
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unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ?
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key_quota_root_maxbytes : key_quota_maxbytes;
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seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
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from_kuid_munged(seq_user_ns(m), user->uid),
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atomic_read(&user->usage),
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atomic_read(&user->nkeys),
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atomic_read(&user->nikeys),
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user->qnkeys,
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maxkeys,
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user->qnbytes,
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maxbytes);
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return 0;
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}
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