// 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_UNLOADstatic 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);