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![Arjan van de Ven](/assets/img/avatar_default.png)
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
263 lines
6 KiB
C
263 lines
6 KiB
C
/* proc.c: proc 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/slab.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 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 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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/*
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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 = create_proc_entry("keys", 0, NULL);
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if (!p)
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panic("Cannot create /proc/keys\n");
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p->proc_fops = &proc_keys_fops;
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#endif
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p = create_proc_entry("key-users", 0, NULL);
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if (!p)
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panic("Cannot create /proc/key-users\n");
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p->proc_fops = &proc_key_users_fops;
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return 0;
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} /* end key_proc_init() */
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__initcall(key_proc_init);
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/*****************************************************************************/
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/*
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* implement "/proc/keys" to provides a list of the keys on the system
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*/
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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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{
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return seq_open(file, &proc_keys_ops);
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}
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static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
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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_serial_lock);
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_p = rb_first(&key_serial_tree);
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while (pos > 0 && _p) {
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pos--;
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_p = rb_next(_p);
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}
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return _p;
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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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(*_pos)++;
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return rb_next((struct rb_node *) v);
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}
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static void proc_keys_stop(struct seq_file *p, void *v)
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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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char xbuf[12];
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int rc;
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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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rc = key_task_permission(make_key_ref(key, 0), current, KEY_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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}
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else if (now.tv_sec >= key->expiry) {
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memcpy(xbuf, "expd", 5);
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}
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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 %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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atomic_read(&key->usage),
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xbuf,
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key->perm,
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key->uid,
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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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/*****************************************************************************/
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/*
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* implement "/proc/key-users" to provides a list of the key users
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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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{
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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 = rb_first(&key_user_tree);
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while (pos > 0 && _p) {
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pos--;
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_p = rb_next(_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 rb_next((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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{
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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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seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
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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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KEYQUOTA_MAX_KEYS,
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user->qnbytes,
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KEYQUOTA_MAX_BYTES
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);
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return 0;
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}
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