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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Module proc support
*
* Copyright (C) 2008 Alexey Dobriyan
*/
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/mutex.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include "internal.h"
#ifdef CONFIG_MODULE_UNLOAD
static inline void print_unload_info(struct seq_file *m, struct module *mod)
{
struct module_use *use;
int printed_something = 0;
seq_printf(m, " %i ", module_refcount(mod));
/*
* Always include a trailing , so userspace can differentiate
* between this and the old multi-field proc format.
*/
list_for_each_entry(use, &mod->source_list, source_list) {
printed_something = 1;
seq_printf(m, "%s,", use->source->name);
}
if (mod->init && !mod->exit) {
printed_something = 1;
seq_puts(m, "[permanent],");
}
if (!printed_something)
seq_puts(m, "-");
}
#else /* !CONFIG_MODULE_UNLOAD */
static inline void print_unload_info(struct seq_file *m, struct module *mod)
{
/* We don't know the usage count, or what modules are using. */
seq_puts(m, " - -");
}
#endif /* CONFIG_MODULE_UNLOAD */
/* Called by the /proc file system to return a list of modules. */
static void *m_start(struct seq_file *m, loff_t *pos)
{
mutex_lock(&module_mutex);
return seq_list_start(&modules, *pos);
}
static void *m_next(struct seq_file *m, void *p, loff_t *pos)
{
return seq_list_next(p, &modules, pos);
}
static void m_stop(struct seq_file *m, void *p)
{
mutex_unlock(&module_mutex);
}
static int m_show(struct seq_file *m, void *p)
{
struct module *mod = list_entry(p, struct module, list);
char buf[MODULE_FLAGS_BUF_SIZE];
void *value;
unsigned int size;
/* We always ignore unformed modules. */
if (mod->state == MODULE_STATE_UNFORMED)
return 0;
size = mod->init_layout.size + mod->core_layout.size;
#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
size += mod->data_layout.size;
#endif
seq_printf(m, "%s %u", mod->name, size);
print_unload_info(m, mod);
/* Informative for users. */
seq_printf(m, " %s",
mod->state == MODULE_STATE_GOING ? "Unloading" :
mod->state == MODULE_STATE_COMING ? "Loading" :
"Live");
/* Used by oprofile and other similar tools. */
value = m->private ? NULL : mod->core_layout.base;
seq_printf(m, " 0x%px", value);
/* Taints info */
if (mod->taints)
seq_printf(m, " %s", module_flags(mod, buf, true));
seq_puts(m, "\n");
return 0;
}
/*
* Format: modulename size refcount deps address
*
* Where refcount is a number or -, and deps is a comma-separated list
* of depends or -.
*/
static const struct seq_operations modules_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = m_show
};
/*
* This also sets the "private" pointer to non-NULL if the
* kernel pointers should be hidden (so you can just test
* "m->private" to see if you should keep the values private).
*
* We use the same logic as for /proc/kallsyms.
*/
static int modules_open(struct inode *inode, struct file *file)
{
int err = seq_open(file, &modules_op);
if (!err) {
struct seq_file *m = file->private_data;
m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul;
}
return err;
}
static const struct proc_ops modules_proc_ops = {
.proc_flags = PROC_ENTRY_PERMANENT,
.proc_open = modules_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = seq_release,
};
static int __init proc_modules_init(void)
{
proc_create("modules", 0, NULL, &modules_proc_ops);
return 0;
}
module_init(proc_modules_init);
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